Loading...
HomeMy WebLinkAboutHAZARDOUS WASTE ~ ~. ~_, .~!~ ~ . .. Groundwater Scientists ° Environmental Consultants REMEDIAL ACTION PLAN FOR SOIL AND GROUNDWATER REMEDIATION AT W.P. DAVIES OIL COMPANY 33051/2 GULF STREET BAKERSFI ELD, CALIFORNIA PRESENTED TO: MR. BILL DAVIES W.P. DAVIES OIL COMPANY AND MS. DOLORES:GOUGH KERN COUNTY DEPARTMENT'OF ENVIRONMENTAL HEALTH SERVICES PRESENTED BY: AQUAGEOSCIENCES, INC. JANUARY, 1994 JOEL S. POMERENE, R.G..//'4724 OPERATIONS MANAGER 1701 Westwind Drive, Suite 101 ' Bake~'sfield, California 93301 (805) 328-0962 ' FAX (805) 328-1129 TABLE OF CONTENTS SECTION 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 9.0 9.1 9.2 9.3. 10.0 INTRODUCTION PROJECT UNDERSTANDING PROJECT PURPOSE PROJECT SCHEDULE PROJECT HISTORY BACKGROUND REMEDIATION RATIONALE OUTLINE OF REMEDIATION PLANS Phase I- Permitting Phase II - Vapor Extraction System (VES) - Equipment and Manifold Installation Phase III - Vapor .Extraction System - Operation and Maintenance Phase IV - Quarterly Groundwater Monitoring and VESt' Progress. Reports Phase V - Data Review & Re-Start Assessment of ~ Groundwater Treatment Unit Phase VI - Confirmatory Soil..Bodngs ,.,: -. ' Phase VII .-'Fina~ .Report ' , '~ Phase VIII - Equipment Decommissioning and Groundwater ..... Monitoring Well Abandonment METHODS Drilling Methods Vapor Sample Collection and Analysis Groundwater Sample Collection and Analysis' QUALITY :ASSURANCE PLAN 10.1.Sample Collection and Handling Protocol ..... 10.2 Sample .Identification and Chain of Custody Protocol, 10.3 Analytical Quality Assurance 11.0 SITE SAFETY PLAN TABLE 1 EXHIBITS 1. 2. 3. 4. Project Schedule Vicinity Map Site Map Vapor Extraction Layout Cross Section A-A' APPENDICES A. Site Safety Plan B. Paragon ET-150 Thermal Oxidizer PAGE 2 2 2 3 4 6 6 7 8 8 9 10 10 11 '11 11 '12 '12 12 12 13 13 13 14 14 1.0 INTRODUCTION Federated Mutual Insurance Company (Federated) on behalf of W.P. Davies Oil Company (Client), has authorized AquaGeosciences, Inc. (AGI) to prepare this Remedial Action Plan (RAP) for soil and groundwater remediation at the W.P. Davies Oil Company fueling facility (Davies Oil) located at 33051/2 Gulf Street in Bakersfield, California (Exhibit 1). 2.0 PROJECT UNDERSTANDING Information obtained by AquaGeosciences, Inc. from the Kern County Department of Environmental Health Services (KCDEHS), Federated, and Davies Oil indicate that the soil and groundwater in the vicinity of the fueling system have been impacted by gasoline range hydrocarbons. The site has been characterized by a number of monitoring wells in the southern part of the property, several, off-site wells, a soil vapor survey, aquifer pump tests, and vapor extraction feasibility tests. Pdor to AGI's involvement, three other consulting firms had been retained, for various phases, of;.the; ,site work. A leaking product line and vent line for the regular.unleaded'gasoline :were ~discovered in 1985 and 1986 respectively, and subsequently repaired.;';~Gasoline range : · hydrocarbons have impacted the soil and groundws{er, at the southwest corne¢ ot;the~.... ~ property and have migrateddowngradier~t in. a;soutl~:westerly:direction from the point.~', of release.. Based on the latest quartedygroundwater.monitodng results, (AGI.- 4th Quarter,. 1993); ..' ,' the extent and magnitude of gasoline impacted groundwater has decreased:. ' dramatically since the prior quarterly report (AGI - 3rd Quarter,'1993)." This is probably due to an increased: rate of, biodegradation associated witha'rising, level of,:.. oxygenated groundwater. ...... This Remedial Action Plan will descdbe the methods and rationale bywhich gasoline impacted soil and groundwater will be remediated at the subject site. 3.0 PROJECT PURPOSE The Remedial Action Plan describes the methods to be used by AGI in order to accomplish remediation of gasoline impacted soil and groundwater at the W.P. Davies Oil Company site in Bakersfield, California. The Remedial Action Plan has the following objectives: Outline the soil and groundwater remediation plans. This outline represents AGI's initial assessment of the contamination problem at the Davies Oil site, and the time frame for the implementation of the different phases of remediation: 2 Construct a site location map showing all structures, monitoring wells, borings, and property boundaries; Obtain the necessary permits as required for the VES construction, installation, trenching, and manifolding; Operate, monitor, and maintain the Vapor Extraction System for the duration of effective remediation; EvalUate soil vapor and groundwater data dudng the first two quarters of VES remediation to determine whether the existing groundwater treatment unit should be re-started, and implement re-start if warranted; Advance confirmatory sail borings to confirm satisfactory site remediation; Co{lect and analyze groundwater samples from all site ' related: '. monitoring wells 'to confirm satisfactory groundwater'remedi~ien ;'~,-' Prepare a closure.report summarizing methods and resu!zs of the:.soil- and groundwater rernediation program; and ",,.": Decommission: remediation' equipmen-~: and properly abandon ail vapor :"~,' ~: · '-..' ~.-.' ~ extraction and groundwater moniloring wells upon approval of site , ~ closure by KCDEHS.~ .~ 4,0 PROJECT SCHEDULE. AquaGeosciences, !nc. expects, to .begin. the work'described, in this RAP-.wit~in one ~(1)' week of it's" approval by the Kern County' Department. of: Environmental Heaithi Services, approval of an application for.Authority=to Construct~ (ATC)'from th~ Joaquin .Valley Unified Air Pollution Control District (SJVUAPCD), obtaining City of' · Bakersfield building permits (if required), Bakersfield Fire Department plan approval, and authorization to proceed from the Client. A bar graph, Table 1, illustrates the project schedule. The time frame for each phase of the remediation project is further described as follows: Phase I - Permitting is expected to take approximately one and half (11/2) months to obtain necessary approvals. Among these are: - Remedial Action Plan (RAP)approval from KCDEHS, - Authority to Construct (ATC) approval from the SJVUAPCD, - City of Bakersfield Fire Department, Building Inspection, and Electrical Inspection approvals, and Any other permits, inspections, or approvals necessary to proceed with the project installation. The Permit to Operate (PTO) is granted at a later date, following satisfactory equipment construction, system installation, and approved inspections. Phase II- Vapor Extraction System (VES) Equipment and Manifold Installation is expected to require approximately one (1) month to complete following approval of the Authority to Construct (ATC) permit from the SJVUAPCD. Phase III - Vapor Extraction System - Operation and Maintenance, and Phase IV - Quarterly Groundwater Monitoring and VES Progress Reports will be accomplished concurrently over an estimated continuous remediation period of twelve (12) months in order to reach satisfactory closure levels after equipment start-up. Quarterly progress reports incorporating both groundwater and vapor sampling data will be prepared at ~ quarterly- (3. month) intervals and submitted to.the. KCDEHS~,. ~:- Data Review and Re-Start Assessment' of the Groundwater .Treatment Unit .: ." will be undertaken during the data acquisition phase of'the second quarterly progress. report after remedistion start-up. The review andm-start~assessrnent will require approximately one (1) month. ~- Confirmatory Soil Borings, with soil. and grourtdwa~eranalyti~cat resu, lt.:s'~.will =:~. '.-. ~ be accomplished within one' (1.') month of the decision to test for c~osur~+--.. "- ~-' : ~ ~.~ P_hase VII- Final Report will be.submittedwithin one.(~l)monthof closure'approval receipt.of confirmatory analytical data as established by. the: KCDEHS.. Phase VII!- Equipment Decommissioning and Gro[~.ndwate~. Monitoring We!l';'= ~ .-~ .". ..... Abandonment. is expected to be completed, within o~e.:(l).month .of. closure approval:, by the KCDEHS. 5.0 PROJECT HISTORY During the winter of 1985, inventory records first detected product losses from the regular-gasoline dispensing system. In response to these losses, a'pressure test was conducted on the tank and lines which indicated a leak in the regular-gasOline product lines. The suspect faulty line was repaired, but shortly thereafter, inventory records again indicated product losses. The tanks and lines were tested again on March 3, 1986 where a leak in the vapor lines was detected then subsequently rePaired. On July 1987, Twin Cities Testing Corporation estimated 2,500 gallons of regular-gasoline may have been lost on site. Shortly thereafter, Davies Oil appraised KCDF_.HS of the situation. 4 In October, 1986, three (3) 10,000 gallon underground storage tanks were removed from the Davies facility because they were no longer in use. According to the KCDEHS, diesel fuel was detected in soil samples obtained-during the excavation. Information generated by several prior consultants including Delta Environmental Consultants, Inc., Aegis 15nvironmental, Inc., and Associated Soil Analysis, Inc. reveal the presence of both soil and groundwater contamination by gasoline range hydrocarbons at the subject site. A total of seventeen (17) groundwater monitoring wells, (nine (9) two inch and eight (8) four inch diameter) have been installed on-site. Additionally, there are two groundwater recovery wells, one 12-inch and one 6-inch diameter, designated as RW-1 and MW-12a. A groundwater treatment system was installed that consisted of a packed column air stripper for dissolved phase hydrocarbon removal and two carbon filters in line at the effluent port pdor to discharge to an on-site infiltration gallery. During installation and operation of the treatment system in 1988 and 1989, the water table was relatively stable between 18 and 22 feet. below ground surface (bgs). In February of'1990i ~the. water table' d~'opped ~ below the. bottom.of the groundwater recovery well at 36 feet bas :due to regional'".. drought condition's': rendering the remediation equipment te'mporadly inoperati~e. In November, 1988 hydraulic conductivity tests were performed by Delta Environniental Consultants, Inc. This test was performed on RW-1 using a short duration pump test. Transmissivity was estimated to be 12,000 gpdi'ft and hydraulic ccnductivity was calculated at 70 ft/day. A maximum plume extent was then calculated and was estimated at 1100 ft down gradient and was later confirmed by down gradie~lt monitoring wells MW-13 and MW-14a. : A soil vapor survey.was conducted in November, 1990 to establish the limits of hydrocarbon vapors in the soil. In January, 1991 three (3) 4-inch diameter monitoring wells were installed in down gradient positions (MW-13, MW-14, and MW-i 51) and one 4'inch well was placed in an upgradient position (MW~I'6) at the northern boundary of the property. Well depths, ranged from 48.Sfeet to 55.0 feet bgs: Groundwater: ~" analyses revealed benzene contamination above State Action Levels (SAL)in down gradient wells MW-13, MW-14, and MW-15. Upgradient well MW-16 showed non- detect (ND) results for all analytes. MW-14 however, exhibited the highest levels of dissolved hydrocarbons due to its central position down gradient of the gasoline plume. All four groundwater monitoring wells became dry in April, 1991 dUe to a continuing decline of the water table. The deepest well was MW-13, completed to a depth of 55 feet bgs. In March, 1992 four of the groundwater monitoring wells were twinned with deeper wells screened from 30 to 60 feet bgs to accommodate the declining water table. The new wells were designated MW-la, MW-11a, MW-12a, and MW-14a, respectively. All wells were completed with 4-inch Schedule 40 PVC casing and liner, except for MW- 12a, which was completed with 6-inch diameter PVC casing. A pump test was conducted on MW-12A before plumbing it to the air stripper tower on-site. The 5' groundwater remediation unit was apparently re-started in fall 1992, but due to Iow flow rates, high drawdown, and a continuing decline in the water table, was shut down once again a few months later near the end of 1992. The project had apparently been idle since that time. In September 1993, AGI 'was retained by Federated Insurance to begin quarterly groundwater monitoring, develop and implement a Remedial Action Plan. 6.0 BACKGROUND The Kern County Department of Environmental Health Services is the lead regulatory agency overseeing remediation of the W.P. Davies Oil Company site. The San Joaquin Valley Unified Air Pollution Control District is the responsible agency for approving the Authority to Construct (ATC) application and for granting the Permit to Operate (PTO). The City of Bakersfield will conduct the building fire, and electrical inspections and issue permits/approvals as. appropriate. ..~ . W.P. Davies Oil Company is located at 33051/2 Gulf Street-in' Bakersfield, California. · ' The site is currently operated as a diesel and gasoline dispensinG station.' with four (4) diesel islands and two (2) gasoline islands. Included .in the structural, improvements are two office' complexes and several diesel tractor service'bays. Kemvilte Stage and Freight operates a trucking facility adjoining Davies.Oil on the west~..~A domestic .~ residence is located due south of the site and the Pierce Plaza office complex.adjoins' the southwest comer of the property. BoUnding the site on theeast is a mobile home park, and a, cross Gulf Street to the north is an oilfield equipment service yard.. 7.0 ' REMEDIATION RATIONALE AquaGeosciences, Inc. selected the remediation equipment and designed the vapor. extraction system based upon site specific environmental data~. The fOllOwing site' pararneters focus the remediation design toward specifictarget a~,eas: :~"~. Regional precipitation conditions (drought) since the initial groundwater monitoring wells were installed in July, 1986 have left those and a subsequent series of wells dry. Several of these wells are located in appropriate areas and screened across acceptable intervals to be converted to vapor extraction wells. The relatively high porosity and permeability of the site lithology (i.e. - medium to coarse grained fluvial sands) have enabled natural biodegradation to occur at a faster rate than would normally be expected in finer grained sediments. The observed decrease in both plume size and concentration (AGI - December 1993 Groundwater Quarterly Monitoring Report) can probably be attributed to two (2) primary factors: Volatilization of the lighter fractions (BTEX) through the soil to uncovered ground surface areas due to the volatile aromatic's inherently high vapor pressure; and Influx of dissolved oxygen in the groundwater available to indigenous microbial populations for biodegradation, brought in with the recently rising water table. Concentrations' of Total Petroleum Hydrocarbons as gasoline (TPH-g) in groundwater decreased by an order of magnitude between the last two reporting quarters of 1993 (Exhibits 3 and 4). Remaining concentrations are highest in groundwater monitoring well MW-12a, at the southwest corner of the Davies Oil property. The Remedial Action Plan is designed to address these features, i~3 the.~ollowing manner: Four of the existing groundwater monitoring wells (MW;2; !MW-9~ MW-11, and MW-12) are currently dry and ideally located for conversio.n.to vapor extraction wells. The bottom of the screened interval in each of these wells !s at or very near the water table and will be' very effective in .. sweeping and aerating the capillary fringe. · The site lithology is ideally suited to vapor extr. actio~ remediation by virtue of it's high porosity and permeability.. The resultant effective radius . of influence is expected to be well over one hundred (100)feet, provided that short circuiting, to the unpaved surface areas does not intercept the lateral air flow within the predominantly horizontal strata. The vapor extraction system will use, a. ~'50.CFM (CUbic Feet per Minute) positive:. ' ~ displacement blower coupled with a propane or.natural gas fired thermal oxidizer. Each vapor extraction well will be equipped with "tee" and ball valve, which enables it to be configured as either an extraction or inlet well. If a short-circuit problem becomes evident, AGI will propose environmentally acceptable methods for sealing the ground surface within the radius of influence of the affected well(s). 8.0 OUTLINE OF REMEDIATION PLANS The following scope of work is proposed by AGI in order to achieve timely and cost- effective remediation of gasoline impacted soil and groundwater at the W.P. Davies Oil Company in Bakersfield, California. 7 An outline is presented below and is followed by detailed descriptions of each phase of work. Phase I- Permitting Phase II - Vapor Extraction System (VES) - Equipment and Manifolding Installation Phase III - Vapor Extraction System - Operations and Maintenance Phase IV - Quarterly Groundwater Monitoring and VES Progress Reports Phase V - Data Review and Re-Start Assessment of Groundwater Treatment Unit Phase VI - Confirmatory Soil borings Phase VII - Final Report Phase VIII - Equipment Decommissioning and Groundwater monitoring Abandonment The proposed.phases are further described as follows:. 8.1 phase i -.Permitting AG I will obtain the permits and approvals as.necessary, from the appropriate .. regulatory agencies such. as, but not.limited, to, the California Regional Water .i:., .'~ Quality Control Board (Central Valley Region), the San Joaquin Valley Unified~ Air Pollution Control District, the City of Bakersfield and the Kern County," Department of Environmental Health Services. These permits include,butmay not be limited to the Authority to Construct (ATC) and Permit to Operate'(PTO) from the San Joaquin Valley Unified APCD. Permits required by local building: ordinances or other codes for utility hook-ups will be obtained by the,Client.. AGI will obtain copies of the appropriate building plans, or blueprints of, the 'area affected by the proposed, sub-grade manifoid~ system..' These documents; will, be carefully reviewed with site personnel knowledgeable of the area to minimize the possibility of encountering underground utilities or piping dudng trenching activities for the. manifold installation. 8.2 Phase II - Vapor Extraction System (VES) - Equipment and Manifold Installation Four (4) vapor extraction wells are proposed, all of which already exist. Three of the wells, MW-11, MW-12a, and MW-2, are located on the southwestern comer of the Davies property. The fourth well, MW-9, is located in the Kernville Stage and Freight parking lot. It should be noted that at this time MW-9 has not been located. This is an essential well as it lies in the center of the plume. If MW-9 can not be located it may require an additional well to be drilled in this vicinity. These locations provide laterally contiguous vacuum extraction coverage of the 8 central area of the soil vapor plume, using a 100 foot radius of influence figure (as was determined in a previously conducted vapor extraction feasibility test). Treatment equipment will consist of a 150 cfm natural gas fired thermal oxidizer, distributed by Environmental Instruments Co. (El) of Santa Ana, California. The unit is manufactured by Paragon Environmental Systems of Escondido, California. Equipment information provided by the manufacturer is provided in Appendix B for the vapor extraction unit. The approximate location of the surface treatment equipment is illustrated on Exhibit 3. However, this location is tentative and subject to minor adjustment in order to comply with any Fire Department or other codes governing equipment proximity to Davies fueling system. Soil vapor will be drawn into the vapor extraction wells and through the underground vapor header pipes manifolded to a 150 cfm positive displacement (PD) blower on the thermal oxidizer. The thermal:oxidizer'mixes-' extracted vapors and'appropriate quantities of supplemental fuel to obtain · optimal fuel/air mixtures. The fuel/air mixtbre is then .,burned, in a Combustion, Chamber. Due to the moderate to high concentrations of petroleum hydrocarbons in the. soil, it is AGI's opinion..that minimal supplemental fuel will. be required.for the .first 90 days. of remediation. As .the. concenlration of the vapor stream falls below that required to suslain the required fuel/air mixture' during the course of remediation, supplemental fuel use will increase. As.the vapor stream concentrations are further reduced through remediation, a PD. blower/carbon adsorption unit may be installed as a final "polishing system". The VES wells will be manifolded with 2-inch Schedule 40 PVC. line, to a 150 CFM blower/thermal oxidizer remediation unit.. It will. also be equipped with a. , PVC Tee ~connection and slip cap, as well as a 2-inchball valve ~on-the, manifold~. line, 9nabling each well to. be confi§ured as either an.inlet or'extraction well.... 8.3 Phase III - Vapor -ExtractiOn System - Operations and Maintenance AGI professional staff, experienced in vapor extraction technology, will conduct operation and maintenance (O & M) of the VES Unit to ensure efficient remediation of the site. Equipment operating parameters will be monitored by AGI by onsite inspections. It is AGI's experience from previous VES Units that maintenance schedules will be daily inspected for the first 10 days; every 2 to 3 days for the next 20 days; and weekly thereafter. Maintenance and inspection schedules will ultimately comply with the permit set by the SJVUAPCD. The operations and maintenance of the system is to include all materials and supplies necessary to conduct normal operational activities such as field screening, systems checks and adjustments, and regular lubrication and 9 maintenance. A strip chart recorder will be included with the thermal oxidizer unit in order to monitor and record it's performance on a continuous basis. 8.4 Phase IV- Quarterly Groundwater Monitoring and VES Progress Reports on a quarterly basis, interim progress reports will be prepared and presented to the Client, Federated Mutual Insurance Company, and the KCDEHS. The purpose of these reports is to keep the Client and lead regulatory agencies abreast of the remedial progress in a formal manner and to provide a snapshot in time of the project. These reports will consist of analytical data to date, equipment records, daily/weekly inspection records, and a discussion of remedial progress. All vapor samples will be collected in tedlar bags and recorded on Chain-of-Custody documents pending transport to a State Certified Laboratory for subsequent analysis for TPH as gasoline, TPH as diesel and BTEX using the DHS LUFT Methods and EPA MethOd 8020, respectively. 8.5 P_~hase V- Data Review and Re-Start Assessment of Groundwater Treatment Unit Quarterly monitoring of groundwater in conjunction with remediating .'the soil and water with the VES unit will-allow AGI to assessthe need for re-starting the already p~'esent groundwater treatment.unit; Although'the .design of the unit is not specifically designed for groundwater,"it" should mitigate hydrocarbon ......... constituents in the groundwater due' to the. position: of the .oresent water.:table level. Should additional treatment of groundwater be warranted after vapor extraction of soil is complete; a concerted effort wil~ be made to're-start the Groundwater Treatment Unit which: is.present. Most' likely an updated aquifer pumping ·test.: will need to be per/ormed on recovery wells so that ~aqu~fer parameters and flow. conditions are indicative of conditions: at the time the:Groundwater Treatment Unit:witl be re-started.~ The data generated'from.the aquifer, pump test will enable AGI to assess the hydraulic conditions of the aquifer and attempt. appropriate adjustments to the Groundwater Treatment Unit. It should be noted that use of the large Groundwater Treatment Unit, located in the southeast corner of the property, hinges on the following considerations: 1) Groundwater Treatment Unit is still operational; 2) Adjustments to the unit are possible to compensate for aquifer parameters at the time of re-start; 3) Present recovery wells are appropriately located and screened to intersect a declining water table; and 4) Treatment Unit is in compliance with current APCD regulations. 10 8.6 Phase VI- Confirmatory S°il Bodngs At such time that vapor monitoring, along with field screening records, indicates that remedial goals may have been met, several borings will be advanced at locations that would be considered representative of the site conditions. The target goals for groundwater are 0.7 ppb or less benzene, and 1.0 ppm or less Total Petroleum Hydrocarbons as gasoline (TPH-g). The remediation program will attempt to achieve Non-detect (ND) levels for TPH-g in soil. Should asymptotic remediation conditions persist, AquaGeosciences will recommend site closure after three (3) month's time following the one (1) year primary remediation period. Soil samples will be collected in these borings and analyzed to provide support of compliance with the closure criteria as negotiated in the Regulatory Liaison. Bodngs will be advanced using CME-75 hollow-stem auger ddlling dg, or equivalent in accordance with established ddlling and sampling methods. Samples will be collected at 5 foot depths from ground surface to the top of. groundwater, stored'~and sealed, in appropriate containers, recorded on Chain-of-Custody documents, and transported to a State Certified Laboratory for subsequent analysis. All samples will be analyzed for TPHg, TPHd, and BTEX in accordance with accepted CA DHS LUFT methods. 8.7 Phase VII - Final Report After completion of Phases I through VI, a final "Closure Report" will.be generated. This report will summarize the project history, the remedial action pursued, field activities, analysis of sample analytical results, confirmation sampling that indicates compliance with closure cdteda, and the conclusions and recommendations that may be drawn from this information. Copies of this report will be provided to the Client for submittal to. the appropriate regulatory agencies. 8.8 Phase VIII- Equipment Decommissioning and Groundwater monitoring . - Abandonment Upon confirmation that the remediation has been successful, AGI will pressure grout or remove all man-made conduits associated with this remediation (i.e. monitoring wells, extraction wells, horizontal vapor extraction lines, and all headers as per applicable lead agency requirements. The equipment used on- site will be disconnected, prepared for shipping, and finally removed from the site. 11 9.0 Methods The following sections describe in detail the methods to be employed in implementing this Remedial Action Plan. 9.1 Drilling Methods The confirmation soil borings will be advanced using a CME-75 Rig, or equivalent equipped, with 6 5/8 inch diameter or larger hollow stem continuous flight augers in accordance with ASTM Method D1452-80 for soil investigations and sampling by auger bodngs. The auger and hammer will be steam cleaned pdor to drilling each boring. The lithology and other pertinent data will be recorded on a field boring log in accordance with ASTM Method D2488-84 for visual description and identification of soils. Borings will be logged by or under the direct supervision of a California Registered Geologist. Cuttings and other spoil from the borings will be placed back in the borehole if field screening indicates clean samples. If contaminants are detected from field screening, the cuttings will be stored in D.O.T. approved 55-gallon drums pending analysis. 9.2 Vapor Sample Collection and Analysis The vapor extraction lines (wells) will.be sampled using 'al/8 'HP oil-less ......... diaphragm air compressor/vacuum pump..Tedlar bags will be obtained from the lab to be used for sample storage. These containers will be filled such that no outside air exists. All samples will be labeled, recorded on a Chain-of-Custody document and stored in a sealed, light-proof cardboard box at room temperature and delivered to a California State Certified Laboratory for analysis of the requested parameters within 48 hours of collection. The. vapor samples will be analyzed at a California D.H.S. certified analytical laboratory, in accordance with state guidelines and EPA protocols. The samples will be_ analyzed for TPHg, TPHd, and BTEX using EPA Method 3810/8020. The minimum detection limits will not be over 0.5 mg/m3 for TPH and 0.005 mg/m3 for BTEX. 9.3 Groundwater Sample Collection and Analysis Prior to sampling, all wells will be purged of three to four casing volumes of water using submersible purge pumps. The casing volumes will be calculated by multiplying the height of the freestanding water column in the well by the cross sectional area of the well casing. Purged water will then be transferred to barrels for storage pending review of the analytical results. Temperature, pH, and conductivity will be periodically measured during purging to insure that stable conditions were attained before sampling. Monitoring Well Purge Data Sheets for each well will be created and placed in an appendix. Stable conditions will be assumed when the measured parameters are within 10% of the previous reading and the purged water contains less than 10% suspended solids. The pumps will then be decontaminated between wells using an Alconox wash and rinsing in deionized water. The wells will be sampled using dedicated disposable PVC bailers. 'The sample from each well will be decanted into two 40 mi volatile organic analysis (VOA) vials and one l-liter amber bottle. Care will be taken to ensure no air bubbles were present after the vial and bottle are sealed with Teflon-lined lids. The vials and amber bottle will then be immediately placed in a cooler with ice and maintained below 4 degrees centigrade for transport to Halcyon Laboratories for analysis under chain-of-custody control. 10.0 Quality Assurance Plan This section describes field and analytical quality-assurance procedures to be followed during the remediation. 10.1 Sample Collection and Handling Protocol. Proper sample collection and handling are essential to assure quality of data obtained from a sample., Each soil sample wilt be collected in a brass tube.. , Vapor samples will be collected in tedlar bags: 'The sample containers will be filled to capacity so that no headspace exists. Each sample (both soil and vapor) will be preserved correctly for the intended analysis and stored for no. longer than permissible holding time pdor to analysis. 10.2 Sample Identification and Chain of Custody' Protocol Sample identification and Chain-of-Custody procedures are designed to assure sample quality and to document sample possession from the time it is collected to the time of its ultimate disposal. The container for each sample submitted for analysis will have a label affixed with the identifying number or the number will be inscribed directly on the container. The analytical laboratory will assign a separate sample number unique to that sample for internal sample coordination and identification. A description of the sample including the sample number and other pertinent information regarding its collection and/or geologic significance will be written in field notes and/or a geologic boring log being prepared by the site geologist. These field documents will be kept in a permanent project file. All samples will be analyzed by a state certified laboratory for the analyses requested. and conductivity will be periodically measured during purging to insure that stable conditions were attained before sampling. Monitoring Well Purge Data Sheets for each well will be created and placed in an appendix. Stable conditions will be assumed when the measured parameters are within 10% of the previous reading and the purged water contains less than 10% suspended solids. The pumps will then be decontaminated between wells using an Alconox wash and rinsing in deionized water. The wells will be sampled using dedicated disposable PVC bailers. 'The sample from each well will be decanted into two 40 mi volatile organic analysis (VOA) vials and one l-liter amber bottle. Care will be taken to ensure no air bubbles were present after the vial and bottle are sealed with Teflon-lined lids. The vials and amber bottle will then be immediately placed in a cooler with ice and maintained below 4 degrees centigrade for transport to Halcyon Laboratories for analysis under chain-of-custody control. 10.0 Quality Assurance Plan This section describes field and analytical quality-assurance procedures to be followed during the remediation. 10.1 Sample Collection and Handling Protocol.. Proper sample collection and handling are essential to assure quality of data obtained from a sample.. Each soil sample wilt be collected in a brass tube...: ~ · :: ..-,-:; - Vapor samples will be collected in tedlar bags: "The sample containers wi, II be .... ·" filled to capacity so that no hee. dspace exists. Each sample (both soil and vapor) will be preserved correctly for the intended analysis and stored for no ~ · longer than permissible holding time prior to analysis~ 10.2 Sample Identification and Chain of Custody'Protocol Sample identification and Chain-of-Custody procedures are designed to assure sample quality and to document sample possession from the time it is collected to the time of its ultimate disposal. The container for each sample submitted for analysis will have a label affixed with the identifying number or the nUmber will be inscribed directly on the container. The analytical laboratory will assign a separate sample number unique to that sample for internal sample coordination and identification. A description of the sample including the sample number and other pertinent information regarding its collection and/or geologic significance will be written in field notes and/or a geologic boring log being prepared by the site geologist. These field documents will be kept in a permanent project file. All samples will be analyzed by a state certified laboratory for the analyses requested. A properly completed Chain-of-Custody Form will be submitted to the analytical laboratory along with sample. The laboratory's assigned number will be properly entered on the form. A quality control officer at the lab will verify integrity of sample submitted, proper sample volume, correctness of containers used,-and properly executed Chain-of-Custody Form. Pertinent information will be entered into a log book kept by the laboratory. 10.3 Analytical Quality Assurance In addition to routine calibration of analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of analyses to assure an added measure of reliability and precision. Accuracy is vedfied through the following: 1. U.S. EPA and State certification of results; 2. Participation in inter-laboratory round robin program; "Blind"samples are submitted for analysis by the quality control · officer on a weekly basis. These are prepared'from National Bureau of Standards specifications of EPA reference standards; 4. Vedfication of'results.with.an, alternative' method; 11.0 SITE SAFETY PLAN:' : '"" Appendix A contains a Site Safety Plan which complies with~Worker Right to Know Regulations and CCR Title 26. 14 PHASE I- PERMITTING II- (VEs) INST. III - VES O&M IV - Q.T'LY REPORTING V - DATA REVIEW GW TREATI~ENT VI - CONFIRMATION BORINGS .VII - FINAL REPORT VIII -DECOMMIS- SIONING MONTHS TO COMPLETION 2 4 6 8 10 12 14 16 18 DELIVERABLE REPORTS AQUAGEOSCIENCES, INC. 1701 WESTWlND DRIVE, SUITE 101 BAKERSFIELD, CALIFORNIA 93301 PHONE (805) 328-0962 FAX (805) 328-11 Z9 II DAVIES OIL COMPANY PROJECT SCHEDULE TABLE -- .*~0 ~' r~ Ot !. SITE LOCATION Scale North IAquaGeosciences, Inc. 1 701 Westwind Drive Suite 103 Bakersfield, California 93301 l Telephone: (805) 3;>8-096;:' Fax 328-1129 Davies Oil Company 3305 1/2 Gulf Street Bakersfield, California Exhibit VICINITY MAP I PIERCE ROAD. r~ .~m. MW-14· MW-13.4[m. !! I Rush Swoape I Teamsters Prop~xq~ics I ~'~ ' stoto~ge I I ~ North Monltorl~ Wdl AquaGeosciences, Inc. DAVIES OIL COMPANY EXHIBIT 1701 Westwind Drive, Suito 103 BAKERSFIELD, CALIFONIA Bakersfield, California 93301 2 T,~ephone: (8os~ ~8-o~ SITE MAP L Davies Oil Company ~.':::-:: :..o.:..x.,'....:.--:-.....< .......... >...~.:o-~..-..:.-:.:~:.:'c:-:,.:..x ~.:~:~z~:~:.:~:.:.:.:.:+:~:~.:.:.`..:~:~:~:.:~:..`:°:~:°:~..:.:.~.:.:.:°:°..`..`..::::::.<::::::~:::~::::.<::::::..~:::.`.::: ~-": ::'i: ::?: :.:i!ii~:'.'~!~ii~!~:'..~..'.:: :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: ~ ................. ~..:.:....~ .................................... :::::::::::::::::::::::::::::::::::::::: :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: ~:~:i:i:.::~.~:i:i:i:.~:i:~ ~'::i:~:.'.~:i:i:!:?.i:~:!.?.!.~:s.,.:s ~ p'...:c: :::::::::::::::::::::::::::::::::::: ................ :::::::::::::::::::::::::::::::::::::::::::::::::::::::: ~.~ii~ii::!::i::i~iii::i~':'ii~!~i!i~!~iii::~::::!::iii';:':'~..:~ :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: .:..,:.'-::::'.:~.:~' ~ :...:~.~..:o, ....................................................................................... ~ :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: ~,.,,..,....,........,..,.....~ - SCALE 1"= 42' AquaGeosciences, Inc. 1701 Westwind Drive, Suite 103 Bakersfield, California 93301 Telephone: (805) 328-0952 Fax: (805) 32801129 -I- [ [ DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA VAPOR EXTRACTION LAYOUT Kemville Stage and Freight 3 WEST A Al MW-9 MW-12 MW-11 RW-1 MW-1 10.¸ 15' high 20' 30' 35' .3z. ML ML ML MI SP/SM SP/SM SP/SM _ SP/~ ---- SP = SP '- SP - -- SF 'TPH: NA e.~..~0 p.p~b. ..... -- = e: .A KEY ~ Static groundwater level MW: Monitoring Well B: Benzene TPH: Total Petroleum Hydrocarbon Scale: 1"=30' horlzonM 1"=10' vertical AquaGeosciencesl Inc. 701 Westwind Drive, Suite 103 Bakersfield, 3alifornia 93301 Telephone. (805) 328-0962 Fax: (805) 32801129 TPH: ppb SOILS MH-Silts, primarily fill material OL-Organic Silts OH-Organic Clays SC-Clayey Sand SM-Silty Sand GC-Clayey Gravel GM-Silty Gravel TD=35.0' TD=36.0' TPH: NA D~y well 2" Dia. 12" Dia B: 27[~___ B: ND TPH: 4,300 ppb TPH: ND Title DAVIES OIL COMPANY BAKERSFIELD, CA Cross Section A-A' Exhibit 4 APPENDIX A SITE SAFETY PLAN Introduction: A Site Safety Plan (SSP) has been designed to address safety provisions needed during the site remediation. Its purpose is to provide established procedures to protect all on-site personnel from direct skin contact, inhalation, or ingestion of potentially hazardous materials that may be encountered at the site. The SSP establishes personnel responsibilities, personal protective equipment standards decontamination procedures, and emergency action plans. AquaGeosciences, Inc. seeks to enter property described above for the purpose of conducting soil and groundwater remediation..- Heavy equipment wi!! be brought to the site and operated by:, AquaGeosciences, Inc. 1701 WestWind Drive, Suite 101 Bakersfield, California 93301 .. ~ License Number 655667 A, B, & Haz. The SSP describes means for protecting, all.on-site .personnel:~from deleterious .... contamination or personal injury while conducting on-site activities. As described' below we will meet all requirements promulgated by the California Department of Health Services. Site Background': Davies Oil is located at 3305 1/2 Gulf Street in' the City of Bakersfield, Kern County, California (Exhibit 1).. The site is currently operated as a gasoline and diesel' dispensing service' station and contains two gasoline and four' diesel dispenser islands, along with an office complex. The site is surrounded by commercial operations and residential property. The facility is shown to scale on Exhibit 2. Responsibilities of Key Personnel: All personnel on site will have assigned responsibilities. Mr. Joel Pomerene, R.G. of AquaGeosciences, Inc. will serve as Project Manager and On-Site Geologist. He will also serve as Site Safety Officer (SSO). As SSO, Mr. Pomerene will assure that on- site personnel have received a copy of SSP. Personnel will be required to document their full understanding of the SSP before admission to the site. Compliance with the SSP will be monitored at all times by the SSO. Appropriate personnel will conduct a 15 training session to assure that all are aware of safe work practices. In the training session, personnel will be made aware of hazards at the site and will utilize Material Safety Data Sheets for information on compounds to be encountered. Mr. Joel Pomerene, R.G. will also be responsible for keeping field notes, collecting and securing samples, and assuring sample integrity by adherence to Chain-of-Custody protocol. On-site employees will take reasonable precautions to avoid unforeseen hazards. After documenting understanding of the SSP, each on-site emPloyee will be responsible for. strict adherence to all points contained herein. Any deviation observed will be reported to the SSO and corrected. On-site employees are held responsible to pedorm only those tasks for which they believe they are qualified. Provisions of this SSP are mandatory and personnel associated with on-site activities will adhere strictly hereto Job Hazard Analysis: Hazards likely to be encountered on site include those commonly encountered when operating any mechanical equipment, such' as the danger of falling objects or moving machinery. Simple precautions will reduce or eliminate risks associated with operating such equipment. ' ..... Furthermore, no on-site smoking, open flame, or sparks will be permitted in order to prevent accidental ignition. Hazard Minimization: The following safety Precautions will minimize the previously identified job hazards: Risk Assessment Summary: Exposure to chemicals anticipated on site include gasoline, and benzene, toluene, and xylene (BTX). These chemicals represent a hazard because they are moderately to extremely toxic and most are highly flammable. Threshold Limit Values (TLV's), Short Term Exposure Limits (STEL's), and Toxicity levels (LD50, oral-rat), all in mg/kg (ppm), are listed below: 16 Co m pou nd TLV ST EL Toxicity Gasoline 200 300 .... Benzene 10 25 4894 Toluene 100 150 5000 Xylene 100 150 4300 Benzene is considered an extreme cancer hazard. Exposure Monitoring Plan: A Photo-Ionization Detector (PID) or Hydrogen Flame-Ionization Detector (FID) will be used to monitor vapor concentrations around the site. Should unexpected concentrations of volatile hydrocarbons concentrations be experienced, protective measures will be taken and the operation shut down until the nature of the situation is ascertained; : ~ Personal Protective Equipment: " Personnel on site will have access to respirators with organicvapor cartridges. Replacement cartridges-will be available On site as needed. :,Hard hats: will be wom'~ · by' all personnel on site when in proximity,of-drilling' and-heavy equipment.~..~. ;..... i.,..~'. ......... . .,' .~. Work Zones and Security Measures: Access to the site will be restricted to authorized personnel.~ The Project. Manager will: be responsible for site security. Any excavations remaining open overnight or:afte'r'normai work hourswill be" thoroughly marked with lighted barricades/flashing yellow caution lights and ample yellow CAUTION tape.' · Decontamination Measures: Avoidance of contamination whenever possible is the best method for protection. Common sense dictates that on-site personnel avoid sitting, leaning, or placing equipment on possibly contaminated soil. All personnel will be advised to wash their hands, neck, and face with soap and water before taking a break or leaving the site. Respirators will be washed with soap and water following each day's use. General Safe Work PracticeS: On-site personnel will be briefed each day in "tailgate" meetings as to the day's goals and equipment to be used. Anticipated contaminants and emergency procedures will be reviewed. Appropriate personal protective equipment will be put on and verified correct by $SO, including respirator fit. The On-Site Geologist will oversee operations and log trenches in consultation with the excavators. The Sample Coordinator will assure that proper protocol is used at all times in collecting and handling samples. Training Requirements: The SSO will conduct a pre-site training session which will include all points of MSDS forms, contaminant properties, warning signs, health hazard data, dsk from exposure, and emergency first aid.. The SSO will assure that everyone fully, understands site hazards. Medical Surveillance Program: According to CFR 29, 1910.120, Paragraph (f), employees who wear respirators 30. days or more during one year or who have been exposed to-hazardous substances or health hazards above established permissible exposure limits, are required.to be · monitored medically. All site personnel will be required to have had a complete chemical physical within .the past year. Record Keeping: Documentation will be kept on personnel exposed:to. contaminant hazards on the job ~ site according to OSHA regulations. These will include documentation;that emploYees have received training on· the'SSP, respiratory protection, MSDS forms, and: al!i ~. emergency procedures. These will be reviewed during the. pre-site training meeting. Exposure records on each job will be kept for 30 years to meet requirements. Included will be names and social security number of employees, medical evaluation, on-the- job logs from entry to exit, first aid administered, visits on site by outside persons, and personal air monitoring records. Contingency Plans: In the event a water, sewer, or other utility line is encountered while boring or trenching, the activity will be immediately stopped and the affected utility turned off at the main shut-off valve. In the event of accident, injury, or other emergency, the Project Director, Senior Project Manager, or other person will notify appropriate government agencies or individuals as follows: Kern County Department of Environmental Health Services 2700 "M" Street Bakersfield, California 93301 Ms. Dolores Gough (805) 836-2261 2. Police, Fire, or Ambulance Emergency - 911 3. Nearest Emergency Hospital: Mercy Hospital... 2215 Truxtun Avenue Bakersfield~ California 93301 (805) 327-3371. Emergency Numbers for AquaGeosciences, Inc. perSonnel:`' Mr. Joel Pomerene, R.G., of AGI will serve as Project Manager. and Site... Safety Officer (SSO). He may be contacted at the work site by calling the following' numbers: Pager: (805) 632-0103 Car Phone: (805) 838-0842 In case. of an emergency, you may contact Mr.'-Phil Goaiwin;' R.G. ~.of AGI .at · the following numbers: Office:' (805) 328-0962 Car Phone: (805) 838-7735 Home: (805) 664-0876 APPENDIX B EQUIPMENT INFORMATION PARACK)N ENVIRONMENTAL SYSTEMS BID SUBMITTAL January 19, 1993 Prepared for: ~ ~"°sc~ences 1701Westw~ndDr~ve Bakersfield, CA93301 SOIL GAS EXTRA~'TION TREATMENT SYSTEM GENERAL This proposal is submitted to Martin Siem of Aqua Geosciences in response to a verbal request for proposal. The scope of this proposal is limited to provision of soil gas 'extraction and treatment systems and remote monitoring systems manufactured by Paragon Environmental Systems (PES) to be operated in California. SYSTEM REQUIREMENTS One (1) ea, 250 cfm, skid mounted vapor extraction system with thermal oxidation for treatment of'extracted hydrocarbon vapors is proposed. The Paragon Extra- Therm (ET) remediation system is a complete vapor extraction and treatment system designed to clean up petroleum contaminated soils. The unit can be skid or trailer mounted. The system uses a rotary positive extraction blower to pull hydrocarbon vapors from the contaminated soil. The Extra-Therm destroys vapors in a thermal oxidizer. It is fully automated and contains all instrumentation and safety equipment required for permitting by the South Coast AQMD, Regional Water Quality Control Board and local Fire Department including City of Los Angeles. SYSTEM DESCRIPTION The Extra-Therm soil vapor extraction system is represented in the attached P&ID. The SVES consists of one (1) each inlet moisture separator, particulate filter silencer, 30 gallon liquid storage drum with transfer lines, differential pressure gauge across filter, automatic dilution system with ambient inlet filter, blower vacuum gauge, vibration isolated rotary positive vapor extraction blower and motor assembly, exit silencer, noise suppression acoustic enclosure, pair sample extraction ports, flame arrestor, process flow sensor, flame safety scanner, double block and bleed fuel train, automatic fuel control valve, burner, combustion air blower, combustion chamber, exhaust stack and fully automated control system including 2-pen chart recorder, redundant temperature sensors and redundant over-temperature shutdowns. All equipment descriptions are shown on the attached P&ID, elevation or cut-away drawings. OPERATION The Extra-Therm extraction blower pulls gasoline vapors out of the soil. The vapors pass through a moisture knock-out pot and filter silencer then enter the automatic dilution system. The vapors then pass through the blower and are delivered to the thermal oxidizer. There they are heated by a burner using ambient combustion .ai~ and'supplemental fuel. This ensures stable combustion under all conditions. Supplemental fuel is added as required to maintain a minimum temperature for proper hydrocarbon destruction. The Extra-Therm automatic control system adjusts the flow of supplemental fuel, dilution air and process gas to maximize destruction'capacity and minimize operating cost. MAINTENANCE All Extra-Therm maintenance can be accomplished within one hour per unit per month in conjunction with periodic site visits. Maintenance items include chart recorder paper and pen changes, blower oil change, adjust & tighten belts, clean · or replace inlet filters as required. Cost for maintenance supplies are negligible. NOISE REDUCTION Noise suppression is included on each ExtradTherm as standard equipment. Each ET contains process stream and dilution air inlet silencers, blower exit silencers, vibration isolation blower and motor mounting and an acoustic noise reduction enclosure surrounding the blower/motor assembly. The ET-250 is the quietest 250 cfm, gas fired thermal oxidizer commercially available. WASTE PRODUCTS Because the Extra-Therm uses an inlet moisture knock-out pot, some amount of entrained liquid is collected in the 30 gallon storage drum. This collected liquid contains hydrocarbons and must be handled and disposed of as a hazardous material. The amount of collected liquid depends upon soil porosity, structure and moisture content etc. Disposal cost can not be accurately predicted as it is site specific. SET-UP AND TRAINING A one day training session will be provided by Paragon personnel. This session will cover all aspects of system safety, controls, start-up procedures, normal operating instructions, routine and preventive maintenance steps~- tuning and trouble shooting. Training is included in the installation cost. LEASE OPTIONS Third party leasing can be provided to meet the client's objectives. The current lease rate for a 1 year lease with a 1 dollar buy-out is 0.09015 times the amount financed. This lease requires a first month payment plus $250 documentation fee. Taxes on monthly payments are not included. Longer term leases reduce the rate factor substantially. .For example, a 2 year lease with the same structure reduces the rate factor to 0.04795 and the documentation fee to $25. PERFORMANCE AND OPERATIONAL DATA Additional performance and operational data are shown in the following tables, figures and appendices. Table 2 shows the destruction capacity, rating and physical parameters including connection requirements. Table 3 shows available options and per unit pricing for each option followed by text descriptions. Figure 1 shows the supplemental fuel consumption as a function of inlet hydrocarbon concentration. Figure 2 shows the extraction flow rate versus inlet concentration. Appendices 1-4 contain references, elevation drawing, P&ID and thermal oxidizer cut-away drawing respectively. Finally a copy of the Paragon Limited Warranty is attached. *Note: This same system has previously b~enpermitted in South Coast AQMD. Destruction Capacity Destruction Rating TABLE 2 ADDITIONAL INFORMATION 730 lbs/day 99.9% Dimensions (L x W x H) 123" x 63" x 90" Weight 2500 lbs Operating Temperature 1400 -1500 F Burner Rating 850,000 BTU/hr max Supplemental Fuel Requirement Natural Gas @ 6" WC or LPG @ 4" WC Noise reduction equipment Included Waste Disposal Costs Unknown TABLE 3 OPTIONS OPTION PRICE Catalytic Retrofit M~dule $8,951 Heat Exchanger Module $10,500 Double Axle Trailer $3,000 Para-Fax Monitoring System $3,000 Para-Fax Cellular Option $5,000 OPTIONS Catalyst: Add-on catalytic module with control modifications. This retrofit allows the Extra-Therm to run with controlling setpoint at about 750 F rather than 1450 F. When inlet concentrations are low and fuel consumption becomes high, this modification save roughly half of the operating cost associated with supplemental fuel consumption. Heat Exchgr Add-on heat exchanger module with approximately 40% heat recivery will allow supplemental fuel consumption at low inlet concentrations to be reduced by a corresponding 40%. Trailer: Detachable, DMV licensed and registered, double axle trailer with lights, surge brakes, tongue jack with caster and two rear mounted leveling jacks. Para-Fax: The Para-Fax remote monitoring and reporting system enables remote monitoring and periodic reporting to any Group 3 facsimile machine. The Para-Fax scans all control parameters continuously for alarm conditions and reports status daily in hard copy format. Remote access for system reconfiguration or queries is included. PF-CellNet: The Para-Fax with cellular transmission capability enables transmission over cellular phone network to receiving fax machine. $00 4~0 4OO 350 ~$0 SUPPLEMENTAL FUEL CONSUMPTION 0 20 40 60 GO '~00 I%,c~o<:arDon Concent. ratlon (I:N:MV as CI14) Figure i 140 130 110 lO0 9O ?0 EXTI:::tACTEO All:::] FLOW 0 20 40 80 go 10o Hjcc]r'o~arbon Concentration C~::¢~' ~l CH4) Figure 2 *Note: The extracted air flow curve is approximated as extracted air flow is adjusted by the Extra-Therm in response to several varibles in addition to incoming hydrocarbon concentration. AIR INLET EXTRACTION PORT FLAME ARRESTER SAMPt. E ", EXTRRCTII:]N VALVE FLrlV (~ SENSDR MANUAL FUEL SHUT[IFF ~L FUEL SMUTCIFF @ AUTI]HATIC FUEL CDNTI~L VALVE SAI, IPLE EXTRACTION VALVE NDISE ATTENUATING ENCLDSURE 7 VACUUMGAUGE EX.AUST! I SILENCER EXTRACTII]N L_ J FUEL IILEED VALVE HIGH PRESSURE S~/ITCH PRESSURE GAUGE FUEL BLOCKIN§ VALVE FUEL SHUTI:iFF VALVE FUEL SHUTnFF VALVE AUTONATIC DILUTION VALVE FILTER MiST FI ELIMINATOR LI::~/ PRESSURE ~ RECi~OuVMERY SWITCH DILUTION AIR J PROC:ESS C.~4~S J FUEL INLET J FILE: ET-PFLDW JPARAGON ENVIRONMENTAL SYSTEMS J ESCBNDIDB, CA 92029 EXTRA-THERM PROCESS FLOW DRAWN DY, D. WIREMAN CK. BY' ISCALE, NONE DATE: 9-15-92 DRAWING NO. ~ECt[BNNO. LEFT SIDE VIE;/ PLAN VIEW ELEVATInN VIEW PARAGDN ENVIRDNMENTAL SYSTEMS ESCQNDIDQ 0 CA 9g0~9 EXTRA-THERM 250 DRAWN BY' DONALD R. ;/EAR CK. BY~ KXTRA~THERM COMPONKHTS LIST I Process Oas Inlet 2 Mist Eliminator 3 Process Filter 4 Dilution Air Filter 5 Automatic Dilution Valve 6 Sample Extraction Valve 7 Flow Sensor 8 Vacuum Gauge 9 Blower Motor 10 Extraction Blower 11 Pressure Gauge 12 Low Air Cut-off Switch Sample Extraction Valve 14 Flame Arrestor IS Burner 16 Oxidation Chaad~er 17 ?empereture Control T/C 18 Sample Extraction Port 19 Stack 21 Fuel Inlet 22 Pressure Gauge Lo. Pressure Switch }4 Fuel Shut-sir Valve 25 Fuel Bleed Valve 26 Fuel Blocking Valve 27 High Pressure Switch 28 Pressure Gauge Manual Fuel Shut-off 30 Automatic Fuel Control Valve 40 Controls Enclosure 41 Electrical Disconnect JSCALE* 1'=1' I DRA~ING DATE, 4-25-91 IND. SECTION NO. TYPE K ,I I PARAGON ENVIRONMENTAL SYSTEMS ESCONDIDO , CA 92029 EXTRA-THERM 250 DXI9IZER IDRAVN BY, DONALD R. VEAR CK. BY~ SCALE, 1':"'17 I DRAVING DATEm 4-2§-9! I NO. Supplemental Fuel Consumption 250 SCFM Oxidizer ;500 ._~ ~-~ Z] r-I C , , , , , $0 10 20 30 40 50 60 Hydrocarbon Concentration (pprnV as CH4) .... (Thousands) I-m--. Therm-Ox ~ Therm-Ox/HR [] Cat-Ox Cat-Ox W/HR ~24VI~ SYSTEMS AND CATALYTIC OXIDIZERS ~ SOIL' Thermal Oxidizer Module The very high destruction efficiency, thermal oxidizer module includes heavy-duty mounting skid with forklift channels, fully insulated oxidation chamber, safety flame arrestor, burner head, supplemental combustion air blower, exhaust cooling air inlet, exhaust stack, inlet and outlet sample ports and .IRI approved, double block and bleed supplemental fuel train. Fully Autc~ated C~ntrol Syst~n. The automatic control system is housed in a N~4A 4 enclosure which contains power distribution and controls for each of the selected modules. The control system is pre-wired and includes a UV flame safety control ele~nent, dual, independent over-t~erature shutdowns, high and low. pressure supplemental fuel cut-offs, and a progran~ble digital temperature control 1 er. 2. 3. 4. Process gas flowmeter on oxidizer inlet Two channel circular chart recorder Catalytic controls (required if Catalytic Module is selected). Class I division II wiring Liquid/Va~or Moisture Separator l~odule The liquid/vapor, moisture separator n~dule includes a liquid knock-out vessel and liquid recovery drum with drain and vent valves. Selection: 1. Standard Module -- 30 gal. drum 2. High Vacuum Module -- pressure vessel 3. Liquid' legel sight glass 4. Explosion proof, high level SHUT-OFF switch De Process Dilution Air Module The process dilution air m~dule allows dilution of the incc~ning process gas stream in order to prevent over-temperature of the thermal oxidizer. Both manual and automatic systems include an air inlet filter/silencer. Selection: 1. No Dilution:' (Custc~ner must make provision for dilution in his inlet piping). Oxidizer will shut down on low temperature or high temperature conditions. Manual Dilution: The amount of d/lution is manually controlled, however, the control syst~n automatically switches to full dilution whenever a low temperature condition exists. A high t~erature condition will cause the oxidizer to shut down. o Automatic Dilution: The amount of dilution is automatically controlled by temperature within the oxidizer chamber. Dilution air increases as required to prevent a high te~n~erature condition. E. Vapor Extraction Module The vapor extraction module includes the vapor extraction blower, electric motor, adjustable sheaves, belts, outlet silencer, vibration isolation, acoustic enclosure, combination starter/disconnect' for motor, in-line process particulate filter, and vacuum gauge. Available voltages (23~, or 46~ VAC) and phases must be specified when ordering. Blower types are discussed below: Rotary Positive Displacement (RPD) Blowers provide highest vacu%an and best power efficiency. They are available with single pb~-~e motors up to 1~ HP. Larger motors require three phase power. RPD blowers are relatively noisy. Regenerative Blowers are quieter than RPDs (except at high frequencies) hence no silencer is needed. They are direct driven and supplied with vacuum relief valve. Because they require more power than RPDs, the electrical service requir~nent is 3 phase. Turbotron Blowers are proprietary helical flow (regenerative) blowers similar to two-stage regenerative blowers in a single package. They provide higher vacuum than Regenerative blowers but may be quieter than RPD blowers at higher flowrates or vacuum. Specific performance curves are available for each type of blower based on oxidizer flow rate. Selecti~: 2. 3. 4. Rotary Positive, belt drive, Low Vacuun = 4.5" Hg. Rotary Positive, belt drive, Mediun Vacuum = 7" Hg. Rotary Positive, belt drive, High Vacuum = 9.~5'' Hg. Regenerative or Turbotron, consult factory. O~tion: 6. Blower by-pass/process recycle valve. Catalytic Converter Module The catalytic converter module enables the thermal oxidizer robe factory or field retrofit to runin a catalytic mode thereby reducing supplemental fuel consumption by roughly half. This module consists of the catalyst insert to the Oxidizer and all mounting, hardware. It is generally purchased as an option and field installed when inlet concentrations drop substantially. It requires the catalytic controls package described above. G. Heat Recovery Module The heat recovery module is intended to reduce operating costs associated with supplemental fuel consumption. The heat recovery module consists of a double pass heat exchanger on the exhaust of the thermal oxidizer which pre-heats the process gas before it enters the cc~bustion chamber. This module reduces the supplemental fuel consumption by approximately 40%, however, it also lowers the maximin VOC concentration which can be processed without dilution air by the same amount. Trailer Module The trailer module includes a heavy duty, dual axle trailer with electric brakes, complete lighting package, 2" ball coupling,' castered tongue jack, two rear mounted leveling jacks, and IIMV license. Opti~%: Standard Trailer Module Trailer Module with two additional, front mounted, leveling jacks Remote Mop, toting and Report/ng Module The r~te mon/toring and reporting module includes a Remote Access" Para-Fax System, Model 4~82 pre-wired to the control system. The Para-Fax system will n, mitor equipment status and send both periodic and alarm status reports over normal phone lines to a facsimile machine. It has .4 analog signals and 8 digital status inputs available. It can be configured, modified or queried remotely iran virtually any ccmvuter with a mode~. O~tious: Additional 4 analog inputs Diskette-based configuration PABAGON BEMEDIATION EQUIPMENT Soil Vapor Extraction & Thermal Treatment System The.Paragon Extra.Therm Remediation System is a complete vaPor"extraction and treatment system built to clean, up gasoline contaminated soils. It uses either a rotary Positive or regenerative, extraction blower to pull hydrocarbon vapors from the contaminated soil. The Extra.Therm destroys vapors in a thermal oxidizer. It can be skid or trailer mounted. It is fully automated and contains all in~,~,,?nentation and safety equipment required for permitting. PARA'GON ENVIRONMENTAL SYSTEMS 1145-G Industrial Avenue Escondido, California 92029 (619) 432-9839 · FAX (619) 432-9848' PARA-FAX REMOTE MONITORING AND REPORTING SYSTEMS · ANALOG INPUTS: Available in groups of four. Each input has 12 bit resolution on any of 7 configurable ranges. These inputs can be config- ured for most standard trans-. ducer outputs: 0-5 VDC, 0-0.5 VDC, 0.-05 VDC, 1-5 VDC, 4.20 mA (250 ohm) with or with- out square root extraction, or type J or K thermocouple (with channel I used for cold junction compensation). · DIGITAL INPUTS: 5V logic or "dry" contact closures available in groups of eight, or 12, 24, 120 VAC or DC available in groups of four. 3/4' q 14 1,6' ~t 3/4'J q~ FRONT VIEW SIDE VIEW l · CONTROL PARAMETERS: Control parameters include unit identification, reporting frequency, normal and alarm phone numbers, input identification and unit scaling, alarm limits and measurement interval. Control parameters are defined during configuration and stored on a 1.2 M, 5%" configuration diskette supplied with the system. This diskette can be modified at any time using a simple menu driven pro- gram. Once configured, the diskette is inserted into the Para-Fax for operation. · · PHYSICAL: The Para-Fax is protected by a NEMA4 enclosure with the following dimensions: 16"H x 16"W x 7"D. The entire system weighs 27 pounds. · POWER: 120 VAC, 1 A. · MOUNTING: The Para-Fax can be mounted to any stable support. Location of mounting holes is shown in Figure 1. · INSTALLATION: Custom installation is available from the factory. However, the Para-Fax installs easily using standard hand tools. OPTIONS: · Configuration Diskette in 1~4 M, 31/2" Format ..... · Additional Analog or Digital Inputs · Digital Input ConditioRers to Allow Input of 24 to 120 VAC or DC Con- trol Signals · Remote Modem Access for Status Inquiry, Configuration or Report Transmission to PC · Remote Shutdown · Cellular Network Communication FEATURES: · Monitors and Records Analog and Digital Inputs · Sends a One-Page Status Report · Communicates with Any Group 3 Facsimile Machine - Uses Normal Telephone Line · Configures and Installs Easily · Protected by NEMA4, Weatherproof Enclosure 11454 Industrial Avenue · Escondido, California 92029 (619) 432-9839 · FAX .(619) 432-9848 PARAGON ENVIRONMENTAL SYSTEMS EX TRA- THERM Soil Vapor Extraction & Thermal Treatment System The Extra-Therm extraction blower ~,ulls gasoline vapors out of the soil. · The vapors pass through a moisture knock-out pot and filter/silencer then enter the automatic dilution system. · When inlet concentrations above ap- proximately 75% LEL enter the system they are automatically diluted to pre- vent over temperature of the thermal oxidizer. · The vapors pass through the blower and are delivered to the thermal oxidizer. · A secondary combustion air blower adds Sufficient oxygen to the process stream to ensure stable combustion under all conditions. · Supplemental fuel is added as re- quired to maintain minimum temper- ature for proper hydrocarbon destruc- tion. · The Extra-Therm automatic control system adjusts the flow of sup- plemental fuel, dilution air and process gas to maximize destruction capacity and minimize operating cost. SPECIFICATIONS 133' x 67' x 90' 3000 lbs. 1400-1500° F 730 lbs/day I MODEL ET-150 · Maximum Flow Rate 150 CFM Dimensions (L x W x H) 123' x 63' x 90' Weight 2500 lbs. Operating Temperature Range 1400-1500° F Des~mction Capacity 438 lbs/day Destruction Rating 99.9% Burner Rating 500,000 BTU/hr. maximum 99.9% 850,000 BTU/hr. maximum Supplemental Fuel Requirement .. Natural Gas at 6' WC or LPG at 4'WC Power Configurations Available 208.480 Volts I Phase or'3 Phase Power Consumption Depends on Blower Type and Required Vacuum Natural Gas at 6' WC or LPG at 4' WC 208-480 Volts I Phase or 3 Phase Depends on Blower Type and Required Vacuum OPTIONS: · Trailer Mounting · Remote Monitoring · Choice Of Vapor Extraction Blower · Class I, Division II Wiring · LEL Sensin? , Remote Shu '*wn Capability · Add-on Catalyhc Module FEATURES: · High Destruction Capacity, Short Remediation Cycle · High Destruction Efficiency, Easy To Permit · Automatic Controls, Minimal Operator Intervention · Simple Design, Low Maintenance · Acoustic Motor/Blower Enclosure, Quiet PARAGON ENVIRONMENTAL SYSTEMS 1145-G Industrial Avenue Escondido, California 92029 (619) 432-9839 · FAX (619) 432.9848 PARA-FAX REMOTE MONITORING AND REPORTING SYSTEMS With the Para-Fax System you can monitor remote equipment and receive daily status reports on your fax machine. The Para-Fax provides Iow cost monitoring of events or equipment in remote locations. It takes sample measurements, calculates statistics and sends status reports to your facsimile machine. All control parameters, including measurement interval and reporting frequency, can be set to your requirements with the configuration diskette installed in any IBM compatible PC. In the event of an alarm, the Para-Fax immediately reports to either of two separate phone numbers. It has four analog and eight digital inputs which can monitor almost any sensor output signal. Typical applications include continuous remote monitoring of flow, concentration, temperature, level, rate, velocity, weather or seismological activity.. BENEFITS: · Saves Time · Reports Alarm Conditions Immediately · Uses Existing Office Fax Machine · Provides Peace of Mind · Costs Less Than Competitive Products 1145-1 Industrial Avenue o' Escondido, California 92029 (619) 432-9839 °-FAX (619) 432-9848 - _ .... ON --',, ' ',~ENTAL - - ; tv!.. cg PARA-FAX REMOTE MONITORIN$ AB REPORTING SYSTEMS · ANALOG INPUTS: Available in groups of four. Each input has 12 bit resolution on any jf 7' configurable ranges. These inputs can be config- ured for most standard trans- ducer outputs: 0-5 VDC, 0-0.5 VDC, 0.-05 VDC, 1-5 VDC, 4-20 mA (250 ohm) with or with- out square root extraction, or type J or K thermocouple (with channel 1 used for cold junction compensation). · DIGITAL INPUTS: 5V logic or "dry" contact closures available in groups of eight, or 12, 24, 120 VAC or DC available in groups of four. FRONT VIEW - I 1/4° SIDE VIEW · CONTROL PARAMETERS: Control parameters include unit identification, reporting frequency, normal and alarm phone numbers, input identification and unit scaling, alarm limits and measurement interval. Control parameters are defined during configuration and stored on a 1.2 M, 51/4" configuration diskette supplied with the system. This diskette can be modified at any time using a simple menu driven pro- gram. Once configured, the diskette is inserted into the Para-Fax for operation. · PHYSICAL: The Para-Fax is protected by a NEMA4 enclosure with the following dimensions: 16"H x 16"W · < 7"D. The entire system weighs 27 pounds. · POWER: 120 VAC, 1 A. · MOUNTING: The Para-Fax can be mounted to any stable support. Location of mounting holes is shown in Figure 1. · INSTALLATION: Custom installation is available from the factory. However, the Para, Fax installs easily using standard hand tools. OPTIONS: · Configuration Diskette in 1.4 M, 31/2" Format .... · Additional Analog or Digital Inputs · Digital Input Conditioners to Allow Input of 24 to 120 VAC or DC Con- trol Signals · Remote Modem Access for Status Inquiry, Configuration or Report Transmission to PC · Remote Shutdown · Cellular Network Communication FEATURES: · Monitors and Records Analog and Digital Inputs · Sends a One-Page Status Report · Communicates with Any Group 3 Facsimile Machine · Uses Normal Telephone Line · Configures and Installs Easily · Protected by NEMA4, Weatherproof Enclosure 1145.1 Industrial Avenue · Escondido, California 92029 (619) 432-9839 ° FAX (619) 432-9848 ~ v -~ T F- M S Groundwater Scientists ° Environmental Consultants Confirmation Borings Work Plan at Davies Oil Company 3305 1/2 Gulf Street Bakersfield, California Kern County Environmental Health Services Department Presented to: Mr. Bill Davies Davies Oil Company and Ms. Dolores Gough V:eQt~-~County Environmental Health Services Department Presented AquaGeosciences, Inc. December 20, 1995 Patrick McCullough Project Geologist in G. #4779 Principal "~lydrogeologist Registration Expires 11/30/96 4440 Orissom St,'eet, Suite 100 · Bakersfield. California 93313 (805) 836-8100 · FAX (805) 836-8800 (800) 3014244 Table of Contents 1.0 Introduction 1.1 Purpose 1.2 Scope of Work 1.3 Schedule 2.0 Background 2.1 Property Description 2.2 Project History 3.0 Geology and Hydrology 3.1 Site Geology 3.2 Hydrology 4.0 Workplan 4.1 Soil Boring Locations 5.0 Methods 5.1 Boring Methods 5.2 Soil Sampling ,5.3 Field Screening of Soil Samples 5.4 Soil Analyses 6.0 Health Risk Assessment 7.0 Report of Findings 8.0 Site Abandonment Procedure 9.0 Quality Assurance Plan 9.1 10.0 2 2 2 3 4 4 4 6 6 6 7 7 7 '7 8 8 9 9 9 -!0 10 Sampling Collection and Handling Protocol 10 9.2 Sample Identification and Chain-of-Custody Protocol 10 9.3 Analytical Quality Assurance 11 Site Safety Plan 1! Exhibit 1 Vicinity Map Exhibit 2 Site Map/Boring Locations Appendix A Site Safety Plan 1 of 17 1.0 INTRODUCTION 1.1 Purpose Based upon two consecutive quarters (September, 1995 and December, 1995) of non- detected analytical data for on-site groundwater monitoring wells and decreasing L.E.L. concentrations for the Vapor Extraction System at Davies Oil, AGI recommends the following course of action: * Advance six (6) confirmation soil borings to establish the concentrations of residual gasoline fuel remaining throughout the vadose zone; * Evaluate vadose zone and groundwater analytical data to determine if the soil and groundwater remediation are complete; * If residual hydrocarbons are present in the vadose zone and/or capillary fringe,' prepare a contaminant fate transport analysis and a health risk assessment prior to requesting, regulatory closure of the site. 1.2 Scope of Work The scope of services described in the Workplan include: * Locating underground utilities from as-built drawings (if available) as well as Underground Service Alert (U.S.A.); * Advancing six (6) soil boring throughout the site; * Each .boring will be advanced to groundwater at approximately 18 feet below grade; * Steam cleaning of all drilling and sampling equipment prior to each boring to minimize cross-contamination; * Collecting soil samples at depths to be evaluated in the field. Initially, samples will be collected at approximately five (5) foot intervals beginning at 'five (feet) feet below ground surface (bgs) and continuing until groundwater. The samples will be collected using a standard California split-spoon sampler equipped with brass tubes, which have been steam cleaned prior to use. These samples will be field screened and selected samples will be submitted for chemical analyses; 2of17 Field Screening will be accomplished using a photo-ionization detector (PID) equipped with a 10.0 eV lamp or a flame-ionizing detector (FID). Soil samples will be placed in mason jars to approximately 50% capacity, shaken, and let stand for app~'oximately 5 minutes. A standard headspace reading will then be collected; Soil samples for chemical analyses will be collected-in brass tubes and sealed with teflon tape, end caps and duct tape. The sealed tubes will be placed in a cooler at 4° centigrade for transport to Halcyon, a State of California DHS certified laboratory, under chain-of-custody protocol; Analysis of approximately eighteen (18) soil samples for Total Petroleum Hydrocarbons as gasoline and volatile aromatics (BTEX) using EPA Methods 8015 modified and 5030/8020, respectively; Prepare field boring logs with appropriate lithology descriptions, blow counts, PID readings, etc. in accordance with ASTM Methodology and the I InifieH Soi.ls.~lo~;~;,-,.~t;~,,-, o,,~,+~.,~ .... ...... ~ ;~; I ~,~ ,~,.~ ~ I I'I'V~.,& I.' I ~.~ [ I'' '~,~1',~¢ ~' ~' ~ I I I, ' Prepare a Risk Assessment to assess whether soil contamination may be left in place without threatening groundwater. AGI proposes using the SESOIL Model described in the Leaking Underground Fuel Tank (LUFT) Field Manual issued by the State of California LUFT Task Force. SESOIL is a mathematical model which simulates the long-term environmental fate ol' pollutants in the unsaturated zone. It can simulate movements of pollutants introduced into the vadose zone and predict the quantity of pollutants which may migrate to groundwater. The SESOIL simulation can also be used to evaluate emission rates at the soil surface of the site. Input parameters are similar to thoSe used to determine groundwater risk. AGI will prepare a Health Risk Assessment for benzene, a volatile aromatic constituent in gasoline which poses the most concern from a human health standpoint. The Health Risk Assessment will be.conducted in accordance with the methods described in the Toxic Air Pollutant Source Assessment Manual for California Air Pollution Control District Permits (known as the CAPCOA Manual). Cancer risk for benzene is evaluated using the emission rates calculated from the SESOIL Model and the resultant ambient air concentrations from the CAPCOA guidelines. Prepare a written report summarizing the results of the investigation including conclusions and recommendations. Additionally, a summary of the Risk Assessment which will include all input assumptions and variables used in the calculations will be presented. The report will be certified b;, a California Registered Geologist. It should be noted that preparation of this assessment and its subsequent certification by a 3of17 registered geologist does not automatically assure approval for closure, but provides a quantitative evaluation of the risk to human health for further evaluation by the State. 1.3 Schedule AGI anticipates beginning work described herein within one week upon approval from Kern County Environmental Health Services Department (KCEHSD) and authorization to proceed from Bill Davies. The confirmation borings can be drilled and sampled in. approximately one day. The analytical data will be reported within two weeks and the report will be completed within two weeks after receipt of the analytical results. The overall project duration from mobilization through final report preparation is anticipated to be approximately 30 days. 2.0 BACKGROUND The following includes a facility description and a sequential project history to date. 2.1 Property Description Davies Oil is located at 3305 1/2 Gulf Street in the City of Bakersfield, Kern County, California (Exhibit 1). The site is currently operated as a gasoline and diesel dispensing service station and contains two gasoline and four diesel dispenser islands, along with an office complex. The site is surrounded by commercial operations and residential property. The facility is shown to scale on Exhibit 2. 2.2 Project History During the winter of: 1985, inventory records first detected product losses from the · regular-gasoline dispensing system. In response to these losses, a pressure test was conducted on the tank and lines which indicated a leak in the regular-gasoline product lines. The suspect faulty line was repaired, but shortly thereafter, .inventory records again indicated product losses. The tanks and lines were tested again on March 3, 1986 where a leak in .the_vapor lines was detected then subsequently repaired. On July 1987, Twin Cities Testing Corporation estimated 2,500 gallons of regular-gasoline may have been lost on site. Shortly thereafter, Davies Oil contacted KCEHSD and apprised them of the situation. In October 1986, three (3) 10,000 gallon underground storage tanks were removed from the Davies facility' because they were no longer in use. According to the KCEHSD, diesel fuel was detected in soil samples obtained dudng the excavation. Information generated by several prior consultants including Delta Environmental Consultants, Inc., Aegis Environmental, Inc., and Associated Soil Analysis, Inc. revealed the presence of both soil and groundwater contamination by gasoline range (. 4of 17 hydrocarbons at the subject site. A total of seventeen (17) groundwater monitoring wells, (nine (9) two inch and eight (8) four inch diameter) have been installed on-site. Additionally, there are two groundwater recovery wells, one 12-inch' and one 6-inch diameter, designated as RW-1 and MW-12a. A groundwater treatment system was installed that consisted of a packed column air stripper for dissolved phase hydrocarbon removal and two carbon filters in line at the effluent port prior to discharge to an on-site infiltration gallery. During installation and operation of the treatment system in 1988 and .1989, the water table was relatively stable between 18 and 22 feet below ground surface (bgs). In February of 1990, the water table dropped below the bottom of the'groundwater recovery well at 36 feet bgs due to regional drought conditions, rendering the remediation equipment temporarily inoperative. In November of 1988, hydraulic conductivity tests were performed by Delta Environmental Consultants, Inc. This test was performed on RW-1 using a short duration pump test. Transmissiviiy was estimated to be 12,000 gpd/ft and hydraulic conductivity was calculated at 70 fi/day. A maximum plume extent was then calculated and was estim&ted at 1100 ft down gradient and was later confirmed by down .gradient monitoring., wells MW, !3. and. MW,.14a... A soil vapor survey was conducted in November 1990 to establish the limits of hydrocarbon vapors in the soil. In January 1991, three (3) 4-inch diameter monitoring wells were installed down gradient of the plume (MW-13, MW-14, and MW-15) and one 4-inch well upgradient (MW-16) at the northern boundary of the property. Well depths ranged from 48.5 feet to 55.0 feet bgs. Groundwater analyses revealed benzene contamination above State Action Levels (SAL) in down gradient wells MW-13, MW-14, and MW-15. Upgradient well MW-16 showed non-detect (ND) results for all analyses. MW-14 however, exhibited the highest levels of dissolved hydrocarbons due to its central position down gradient of the gasoline plume. All four groundwater monitoring wells became dry in April 1991 due to a continuing decline of the water table. The deepest well was MW-13, completed to a depth of 55 feet bgs. In March 19921 four of the groundwater monitoring wells were twinned with deeper wells screened from 30 to 60 feet bgs to accommodate the declinir~g water table. The new wells were designated MW-la, MW-11a, MW-12a, and MW-14a. All wells were completed with 4-inch Schedule 40 PVC casing and liner, except for MW-12a, which was completed with 6-inch diameter PVC casing. A pump test was conducted on MW- 12A before plumbing it to the air stripper tower on-site. The groundwater remediation unit was apparently re-started in fall 1992, but due to Iow flow rates, high drawdown, and a continuing decline in the water table, was shut down once again a few months later near the end of 1992. The project was apparently idle from 12/92 to 9/93. In September 1993, AGI was retained by Federated Insurance to begin quarterly groundwater monitoring, develop and implement a Remedial Action Plan. On April 4, 1994 the KCEHSD approved the Remedial Action Plan submitted by AGI. An addendum to the Remedial Action Plan was then submitted in late April, 1994 which 5of 17 included air sparging of the groundwater which was later approved by the KCEHSD on June 10, 1994.On July 7, 1994, AGI installed ten (10) air sparge wells along the southwest portion of the Davies Facility. On July 11, 1994 through August 4, 1994, AGI began trenching, manifolding, and plumbing the air sparge wells and the existing vapor extraction wells to a Vapor Extraction System. The Fire Cat 250 CFM Thermal Oxidizer was installed and operation of the Air Sparge and VES unit began on August 4, 1994. Operation of this equipment continues to present date. Groundwater monitoring has been conducted on a quarterly basis throughout the remediation. The most recent groundwater monitoring events (September, 1995 and December, 1995) have yielded non-detected analytical results for all on-site groundwater monitoring wells and monitoring of the vapor influent concentrations indicate that remediation at the site may be complete. These data and a detailed summary .were included in the November, 1995 Remediation Status Report submitted for review. 3.0 GEOLOGY AND HYDROGEOLOGY 3.1 Site Geology 'The sediments underlying the site are Quaternary alluvial and fluvial deposits consisting of unconsolidated fine- to coarse-grained sands and sandy silts (Calif. Div. of Mines and Geol., 1964). The soil in the subsudace encountered from previous work consists of well graded to poorly graded sands and gravels to a depth of apProximately 65 feet below the surface grade (bsg). 3.2 Site Hydrogeology Published data (KCWA, 19 9 (::¢) shows the site is located within a region of groundwater mounding. The mounding is presumably a result of groundwater recharge from large sudace holding ponds in association with a water purification plant, located approximately 1/4 mile to the northeast. The regional groundwater gradient beneath the site is to the southwest. Previous work at the site indicated the depth to groundwater remained between 14 to 19 feet (bsg) from July 1986 to March 1989. In subsequent years the depth to groundwater progressively increased, resulting in the drying of several monitoring wells. The continuous drop in groundwater level is believed, in part, the consequence of the prolonged regional drought conditions which existed throughout central and southern California from about 1986 to 1992. In September, 1992 the average depth to groundwat'er at the site was approximately 35 feet (bsg). California Division of Mines and Geology, 1964, Geologic Map of California, Bakersfield Sheet Kern County Water Agency, 1990, Improvement Distdct No. 4, 1989-Report on Water Conditions 6of 17 In November 1995, AGI personnel collected groundwater measurements at the site from the existing monitoring wells. Groundwater measurements collected on November 5, 1995 show the depth to groundwater has an average depth of about 18 feet (bsg). Groundwater gradient is approximately 0.02 feet/l'oot in the southwesterly direction. 4.O WORKPLAN AquaGeosciences, Inc. proposes to evaluate the remediation by vapor extraction of gasoline and BTEX impacted soil at the Davies Oil site toward obtaining final closure. The proposed confirmatory sampling program is designed to meet the closure requirements of the Kern County Environmental Health Services (KCEHS) and to address any remaining public health concerns by conducting a Health Risk Assessment with data derived from a site specific calibrated SESOIL model of surface emission/vadose diffusion/and groundwater transport of the primary constituent of concern, which is benzene. 4.1 Cnnfirmation So.i.[.Boring. Locations. Six (6) confirmation soil bodngs will be advanced to a depth of approximately 18 feet below surface grade, where groundwater is anticipated. Soil samples will be collected at five (5) foot intervals beginning at five (5) feet and continuing to groundwater. The proposed locations are shown on Exhibit 2. The locations have been chosen to provide hydrocarbon concentration data in the areas where pre-remediation concentrations were the highest. Confirmation boring C-1 will be located in the vicinity of MW-2. Confirmation borings C-2, C-3, and C-5 will be advanced in the vicinity of monitoring.wells MW-12a, MW-11a, and MWola, respectively. Confirmation bodngs Co 4 and C-6 will be placed along the northern edge of the pre-remediated plume. 5.0 METHODS The following sections wil!. describe in detail the methods to be employed in implementing this workplan. 5.1 Boring Methods The borings will be advanced using a CME 75 rig, or equivalent, with a eight-inch or larger diameter hollow stem continuous flight auger in accordance with ASTM Method D 1452-80 for soil investigations and sampling by auger borings. The augers will be steam cleaned pdor to ddlling each boring. The lithology and other pertinent data will be recorded on a field bodng log in accordance with Method D 2488-84 for visual description and identification of soils. Cuttings and other spoil from the borings will be placed in appropriate D.O.T. approved 55-gallon drums until verified, with analytical results, whether or not the soil is contaminated. If the material is contaminated, a written plan will be submitted by the facility operator to the County 'Ior their approval before treatment and/or disposal occurs. Disposal will be the responsibility of the Facility operator' and will occur within 90 days of completion of drilling. Backfilling of the boring will be accomplished by pouring a cement/bentonite slurry. If contaminants are not found or suspected in this boring, backfilling will take place by placing native soil into the borehole and capping with a cement/bentonite plug. 5.2 Soil Sampling . Soil samples will be collected through the auger in 2-inch diameter brass sleeves driven in a split spoon sampler by a 140 pound hammer with a 30-inch droP in accordance with ASTM Methods D1586-84 for split-barrel sampling of soil and D1587- 83 for thin-walled tube sampling of soils. The brass sleeves and sampler will be steam cleaned orior to each.use ...... Soil samples will 'be driven at depths of five foot intervals in each boring depending on total depth. The blow counts, recovery, and lithology will be recorded on the field logs. Lithology will be described by an experienced environmental geologist under the direct supervision of a California Registered Geologist in accordance with ASTM procedure D2488-84 (Standard Practice for Description and Identification of Soils). One brass sleeve with soil from each interval will be capped, sealed, labeled in accordance with EPA protocols, recorded on a chain-of-custody form, placed in a cooler at 4© centigrade or less, and transported to a California Certified Laboratory with the chain-of-custody for the specified analyses. Soil samples will be collected at five foot intervals beginning at five feet and continuing until ten feet of unimpacted soil or groundwater is encountered. Additionally, one (1) sample in each boring will be collected at the vadose zone and groundwater interface to evaluate any residual hydrocarbon concentrations in the capillary fringe. 5.3 Field Screening of Soil Samples Soil samples will'be collected using three six-inch brass tubes installed inside a split- spoon sampler. The middle sample tube will be immediately capped and stored in an iced cooler upon collection. The bottom tube will be used for lithologic description, and the top tube will be used for field screening. The material from the top tube will be placed in a mason jar to approximately 50 percent capacity, shaken, and stored for a period of 5 minutes. A standard headspace reading will be collected at this time and noted on the boring log. Field screening will be accomplished using a Foxborough 128 GC/OVM flame-ionizing detector. ,'" 8of17 ',,. 5.4 Soil Analyses A minimum of eighteen (18) soil samples will be analyzed by Halcyon Laboratory, a California State Certified Laboratory in accordance with state guidelines and EPA protocols. The number of samples analyzed will be determined by the total depth of the boring; however, a sample of each five (5) foot interval and at the vadose zone capillary fringe interface will be submitted for analysis. The samples will be analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg) and volatile aromatics (BTEX) using EPA methods 8015M and 8020. The detection limits for TPH as gasoline will be 0.5 mg/kg and for BTEX, 0.005 mg/kg. 6.0 HEALTH RISK ASSESSMENT Once the residual gasoline concentrations have been evaluated, a Health Risk Assessment will be conducted to demonstrate the residual levels that may be left in place without significant risk to human health or the environment. The Health Risk Assessment. will be pe.rfor, med according.to the methods described, in. Sections 2 and 3. of the October 1, 1987 draft of the Toxic Air Pollutant Source Assessment Manual for California Air Pollution Control District Permits (known as the CAPCOA Manual). The objective is to demonstrate that the residually impacted soil may be left in place. Therefore, the assessment will focus on exposures due to non-inhalationlpathways, such as soil ingestion, as well as, surface water and groundwater ingestion. The inhalation exposure due to the residual gasoline fuel remaining is expected to be minuscule and need not be pursued beyond a screening level unless initial estimates indicate a substantial dsk from this exposure pathway. AGI proposes using the SESOIL Model described in the Leaking Underground Fuel Tank (LUFT) Field Manual issued by the State of California LUFT Task Force. SESOIL is a mathematical model which simulates the long-term environmental fate and transport of pollutants in the unsaturated (vadose) zone. It can simulate movements of pollutants introduced into the vadose zone and predict the amount of pollutants which will enter the groundwater. The SESOIL model can also be used to simulate emission rates at the surface of tl~e site. Input parameters are similar to those used to determine groundwater. 7.0 REPORT OF FINDINGS A report of findings will be prepared which will detail field activities, analytical results, discussion of analytical results, conclusions, and recommendations. The report will also include a summary of the Health Risk Assessment which will contain all input parameters, assumptions and variables used in the calculations. The report of findings will recommend what further action, if necessary, may be required. If additional work is warranted, the scope of the additional work will be specified in the report. The report of findings will be certified by a california Registered Geologist. 9of ;7 8.0 SITE ABANDONMENT PROCEDURES Abandonment of operations at the subject site requires the removal of surface facilities' which includes the following points: Piping will be disconnected from the Vapor Extraction System and well heads; The Vapor Extraction machine and piping will be loaded onto a trailer and removed from the site. 9.0 QUALITY ASSURANCE PLAN This section describes field and analytical quality-assurance procedures to be followed during the investigation and remediation. 9.1 Sample Collection and Handling Protocol Proper sample collection and handling are essential to assure quality of data obtained from a sample. Each sample, therefore, will be collected in a brass tube, preserved correctly for the intended analysis and stored for no longer than permissible holding time prior to analysis. Protocol to be applied in this project is described in section 4.2. 9.2 Sample Identification and Chain-of-Oustody Protocol Sample identification and Chain-of-Custody procedures are designed to assure sample quality and to document sample possession from the. time it is collected to the time of its ultimate disposal. The container for each sample submitted for analysis will have a label affixed with the identifying number or the number will be inscribed directly on the container. The analytical laboratory will assign a separate sarnple number unique to that sample for internal sample coordination and identification. A description of the sample including the sample number and other pertinent information regarding its collection and/or geologic significance will be written in field notes and/or a geologic boring log being'prepared by the site geologist. These field documents will be kept in a permanent project file. All samples will be analyzed by a state certified laboratory for the analyses requested. A properly completed Chain-of-Custody Form will be submitted to the analytical laboratory along with sample. The laboratory's assigned number will be properly entered on the form. A quality control officer at the lab will verify integrity of sample submitted, proper sample volume, correctness of containers used, and properly executed Chain-of-Custody Form. Pertinent information will be entered into a log book kept by the laboratory. 10 of 17 9.3 Analytical Quality Assurance In addition to routine calibration of analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of analyses to assure an added measure of reliability and precision. Accuracy is vedfied through the following: 1. U.S. EPA and State certification of results; 2. Participation in inter-laboratory round robin program; "Blind" samples are submitted for analysis by the quality control officer on a weekly basis. These are prepared from National Bureau of Standards specifications of EPA reference standards; 4. Verification of results with an alternative method. 8.0 SITE SAFETY PLAN Appendix A contains a Site Safety Plan which complies with Worker Right to Know Regulations and CCR Title 26, 11 of 17 .3 IOPOU'TA,N SITE LOCATION ICOLUM I Scale .:ALIFORNIA North · uaOeo$oence.s, In(;. 701 We$~wind Drive Suite 103 a;,' ~fieid, California 93301 'ek.,~,lone: (805) 328-0962 Fax 328-1129 Davies Oil Company 3305 1/2 Gulf Street Bakersfield, California VICINITY MAP ~ -- III I I ~II I I I I I I I I I I i I _ Underground MW-8 Scale 1 ~-- 62.5' Ill I A0uaGeosciences, Inc. 1701 Westwind Drive, Suite 103 Bakersfield, California 93301 Telephone: (805) 328-0962 Fax: (805) 32801129 I I [~Underground Storage Tank Underground C-2 Storage lVlW-12a Tank.~ i+ RW'--; .= Building Davies Oil Company Pump Islands Natural Gas penser I. nfil/tation Gallery Monitoring Well Confumation [] Boring ~.~ , L°cati°n ~d DAVIES OIL COMPANY BAKERSFIELD, CALIFOTM CONFIRMATION BORING LOCATIONS EXHIBIT 2 APPENDIX A SITE SAFETY PLAN Introduction: A Site Safety Plan (SSP) has been designed to address safety provisions needed during the confirmation boring. Its purpose is to provide established procedures to protect all on-site personnel from direct skin contact, inhalation, or ingestion of potentially hazardous materials that may be encountered at the site. The SSP establishes personnel responsibilities, personal protective equipment standards decontamination procedures, and emergency action plans. AquaGeosciences, Inc. seeks to enter property described above for the purpose of conducting'confirmation-borings'consisti~r~j~'of six (6)boring'~to~evaluate'the residual contamination of the soil. Soils samples will be collected at five-foot intervals dUring exploratory drilling using a California modified split-spoon sampler through a hollow-stem auger. All possible efforts will be made to collect undisturbed samples. Each sample to be chemically analyzed will be collected in a brass sleeve, capped with lined plastic lids, sealed with tape, and placed on ice in a cooler immediately. All Chain-of-Custody protocol will be followed. Drilling equipment will be brought to the site and operated by a subcontractor: Soils Engineering, Inc. 4700 Distdct Boulevard Bakersfield, California 93313 C-57 License Number 253192 The SSP describes means for protecting all on-site personnel from deleterious contamination or personal injury while conducting on-site activities. As described below we will meet all requirements promulgated by the California Department of Health Services. Site Background: This property is owned by Mr. Bill Davies, located at 3305 1/2 Gulf Street., Bakersfield, California. 12 of 17 Responsibilities of Key Personnel: All personnel on site will have assigned responsibilities. Mr. Patrick McCullough of AquaGeosciences, Inc. will serve as Project Manager and On-Site Geologist. He will also serve as Site Safety Officer (SSO). As SSO, Mr. McCullough will assure that on-site personnel have received a copy of SSR Personnel will be required to document their full understanding of the SSP before admission to the site. Compliance with the SSP will be monitored at all times by the SSO. The SSO will conduct a training session to assure that all are aware of safe work practices. In the training session, personnel will be made aware of hazards at the site and will utilize Material Safety Date Sheets for information on compounds to be encountered. Mr. Patdck McCullough will also be responsible for keeping field notes, collecting and securing samples, and assuring sample integrity by adherence to Chain-of-Custody protocol. ...,,f"~n-eH'~..,,,.. "" ' 'l"'"'.f '""'-'c'rnnlc~'"c~c~ ,.ill...,,, take., reasonable precautions-to avoid unforeseen .... hazards. After documenting understanding of the SSP, each on-site employee will be responsible for strict adherence to all points contained herein. Any deviation observed will be reported to the SSO and corrected. On-site employees are held responsible to perform only those tasks for which they believe they are qualified. Provisions of this SSP are mandatory and personnel associated with on-site activities will adhere strictly hereto. Job Hazard Analysis: Hazards likely to be encountered on site include those commonly encountered when operating any mechanical equipment, such as the danger of falling objects or moving machinery. : Simple precautions will reduce or eliminate risks associated with operating such equipment. A drilling contractor has been employed to deliver and operate all ddlling equipment. Qualified personnel only will have any contact with this equipment. All on- site personnel, including the ddlling contractor and his employees, are required to wear hard hats when in close proximity to ddlling equipment. Latex gloves will be 'worn by persons collecting or handling samples to prevent exposure to contaminants. Gloves will be changed between samples, and used ones discarded, to avoid cross- contamination. Proper respiratory equipment will be worn if vapor contamination levels on site exceed action levels as determined using a PID. Action levels requiring respiratory apparatus will be 5 ppm, in the breathing space. 13 of 17 Furthermore, no on-site smoking, open flame, or sparks will be permitted in order to prevent accidental ignition. Risk Assessment Summary: EXposure to chemicals anticipated on site include gasoline, and benzene, toluene, and xylene (BTX). These chemicals represent a hazard because they are moderately to extremely toxic and most are highly flammable. Threshold Limit Values (TLV's), Short Term Exposure Limits (STEL's), and Toxicity levels (LD50, oral-rat), all in mg/kg (ppm), are listed below: Compound TLV STEL Toxicity Gasoline 200 300 .... Benzene 10 25 4894 Toluene 100 150 5000 Xylene 100 150 4300- Benzene is considered an extreme cancer hazard. Exposure Monitoring Plan: A Photo-Ionization Detector (PID) will be used to monitor vapor concentrations around the site. Should concentrations exceed TLV's, protective measures will be taken. Passive dosimeter badges will be placed in 'downwind locations if PID reading indicate high levels of volatile organics in the breathing space. Personal Protective Equipment: Personnel on site will have access to respirators with organic vapor cartridges. Replacement cartridges will be available on site-as needed. When handling samples, the on-site geologist will wear latex gloves. Hard hats will be worn by all personnel on site when in proximity of_drilling equipment. Work Zones and Security Measures: Access to the site will be restricted to authorized personnel. A set of cones, placards, or wide yellow tape, surroUnding the site will define the perimeter. The Project Manager will be responsible for site security 14 of 17 Decontamination Measures: Avoidance of contamination whenever possible is the best method for protection. Common sense dictates that on-site personnel avoid sitting, leaning, or placing equipment on possibly contaminated soil. All personnel will be advised to wash their hands, neck, and face with soap and water before taking a break or leaving the site. Respirators will be washed with soap and water following each day's use. Drilling and sampling equipment used will be decontaminated by steam- cleaning. Sampling equipment will be decontaminated before each sample is taken and drilling equipment will be decontaminated before each boring is commenced. General Safe Work Practices: Drillers and other on-site personnel will be briefed each day in "tailgate" meetings as to the day's goals and equipment to be used. Anticipated contaminants and emergency procedures will be reviewed. Appropriate personal protective - equipment will be put on and verified correct by SSO, including respirator fit. Drilling and sampling equipment will be steam-cleaned before being brought on site. Split-spoon sampling equipment will be steam-cleaned before each use. Augers will be steam-cleaned between borings. The On-Site Geologist will oversee operations and log borings in consultation with drillers. The Sample Coordinator will assure that proper protocol is used at all times in collecting and handling samples. Training Requirements: The SSO will conduct a pre-site training session which will include all points of MSDS forms, contaminant properties, warning signs, health hazard data, risk from exposure, and emergency first aid. The SSO will assure that everyone fully understands site hazards. Medical Surveillance Program: According to CFR 29, 1910.120, Paragraph (f), ernployees who wear respirators 30 days or more during one year or who have been exposed to hazardous substances or health hazards above established permissible exposure limits are required to be monitored medically. All site personnel will be required to have had a complete chemical physical within the past year. , 15 of 17 Record Keeping: Documentation will be kept on personnel exposed to contaminant hazards on the job site according to OSHA regulations. These will include documentation that employees have received training on the SSP, respiratory protection, MSDS forms, and all emergency procedures. These will be reviewed during the pre-site training meeting. Exposure records on each job will be kept for 30 years to meet requirements. Included witl be names and social secudty number of employees, medical evaluation, on-the-job logs from entry to exit, first aid administered, visits on site by outside persons, and personal air monitoring records. Contingency Plans: In the event of accident, injury, or other emergency, the Project Director, Senior Project Manager, or other person will notify appropriate government agencies or individuals as follows: Kern County Environmental Health Services Department 2700 "M" Street, Suite 300 Bakersfield, California 93301 (805) 861-3636 Contact: Ms. Dolores Gough 2. Police, Fire, or Ambulance emergency 911 3. Nearest Emergency Hospital: San Joaquin Community Hospital 2615 Eye 'Street Bakersfield, California 93301 (805) 395-3000 16 of 17 Emergency Numbers for AquaGeosciences, Inc. personnel: Mr. Patrick McCullough of AGI will serve as Project Manager and On-Site Geologist. He may be contacted at the work site by calling the following numbers: Pager: (805)' 632-0103 Car Phone: (818) 425-0449 In case of an emergency, you may contact Mr. Phil Goalwin, R.G. of AGI at the following numbers: Office: (805) 836-8100 Car Phone: (805) 828-0881 Home: (805) 664-0876 17 of 17 STEVE IVk:CALLEY, R.E.H.S. ~IRECTDR 2700 'M" Street, Suite 300 Bakersfield, CA 93301 (805)861-3636 (805)861-3429 FAX January 9, 1996 COUNTY Environmental Health Services Department Mr. William Davies Davies Oil Company P.O. Box 80067 Bakersfield, CA 93306 SUBJECT: Confirmatory Borings Workplan, Davies Oil Company, 3305m Gulf Street, Bakersfield, CA (Permit No. 050072) Dear Mr. Davies: The workplan prepared by AquaGeosciences to evaluate the status of soil remediation at the subject site has been reviewed. In addition to the proposed scope of work, we recommend that soil samples below the water table be also retrieved from two of the borings (preferably C-2 and C-5). Please notify this office at least 48 hours prior to beginning drilling activities. If you have any questions regarding this matter, I can be reached at (805) 862-8728. Sincerely, Steve McCalley, Director cc: AquaGeosciences, Inc. 0$0072h. clt BY: Dolores Gough Hazardous Materials Specialist Hazardous Materials Management Program ...... ' .... ' ~' Groundwater Scientists ° Environmental Consultants CLOSURE REPORT OF GASOLINE IMPACTED SOIL AND GROUNOWATEi-~ AT DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA PRESENTED TO MR. BILL DAVIES DAVIES OIL COMPANY AND MS. DOLORES GOUGH KERN COUNTY ENVIRONMENTAL HEALTH AND SERVI.CES DEPARTMENT PRESENTED BY AquaGeosciences, Inc. March, 1996 'Patti'ok Mo~~lo u.~h1 Project Geologist Philip Goa~w' , R.G. #4779 Principal~-Iydrogeologist . ~,~¢?~,.~ .~X;/ Registration Expire11/30/96 " ~ 4440 Grissom Street, Suite 100 ° Bakersfield, California 93313 (805) 836-8100 ° FAX (805) 836-8800 (800) 3014244 1.0 2.0 3.0 4.0 5.0 6.0 7.0 TABLE OF CONTENTS EXECUTIVE SUMMARY BACKGROUND 2.1 Facility Description 2.2 Project History SITE GEOLOGY AND 3.1 Site Geology 3.2 Site Hydrogeology HYDROLOGY FIELD 4.1 4.2 4.3 4.5 4.6 4.7 PROCEDURES Boring Methods Soil Sampling Field Screening of Soil Samples ~.r,'~ ,r.,,-,h~,,~,l, ,' r"l_~ ,...~ ....... ,,,e ..,_ Groundwater Monitoring Well Purging Groundwater Sample Collection Chemical Analyses RESULTS 5.1 Confirmation Borings 5.2 GroundWater Monitoring DISCUSSION 6.1 Vadose Zone 6.2 Groundwater CONCLUSIONS Page # 3 4 4 4 7 7 7 9 10 10 10 I I 11 11 12 12 12 14 15 15 15 16 .8.0 LIMITATIONS ...... 17 Table 1 Table 2 Table 3 Exhibit 1 Exhibit 2 Exhibit 3 Exhibit 4 Groundwater Elevations Soil Analysis Results for Confirmation Borings C-1 through C-6 Groundwater Analysis Results Vicinity Map Plot Plan Confirmation Boring Location Potentiometric Map 9 13 14 Exhibit 5 Exhibit 6 Exhibit 7 TPHg Concentration Map in Groundwate,' LEL vs. Time Plot Gallons remediated vs. Time Plot Appendix A Confirmation Boring Logs Appendix B Laboratory Reports and Chain-of-Custody for Confirmation Appendix Appendix Appendix Appendix Soil Samples C Purge Data Sheets D Laboratory Reports and Chain-of-Custody for Groundwater Samples E Historical Water Elevations F Historical Groundwater Analyses 1,0 EXECUTIVE SUMMARY This report, documents the project history throughout the remediation process, reviews historical and recent quarterly groundwater sampling, details remediation operations, and presents the results of six (6) confirmation soil borings advanced at the Davies Oil Company site. Based on the results of this review and assessment, it is AGl's opinion that soil and groundwater at the Davies Oil site has been remediated to concentrations below MCL's and presents minimal risk to groundwater resources and/or potential receptors. Site closure is recommended with the caveat that all subsurface wells and structures be properly abandoned. In late 1985, inventory records first indicated product losses from a regular-gasoline dispensing system. A pressure test was performed on the tank and lines which indicated a leak in the product line. The faulty line was subsequently repaired, but shortly thereafter, inventory records again indicated product losses. The tanks and lines were re[ested in March 1986, where it was detected that a vapor line had leaked. The vapor line was repaired and Kern County Environmental Health and Services Company. From 1987 to 1988, Delta Environmental, Aegis Environrnentai and Associated Soil Analysis installed seventeen (17) groundwater monitoring wells on and off-site. In late 1988, groundwater remediation at Davies Oil Company began using a pump and treat system. In February 1990, water treatment was halted due to groundwater elevation decrease which rendered the remediation equipment inoperative. On July 7, 1994, AquaGeosciences, Inc. (AGI) installed ten (10) air sparge wells in the vicinity of groundwater impaction and manifolded monitoring wells MW-l, MW-2, MW-10, MW-11 and MW-12 and recovery well RW-1 to a vapor extraction system. In November, 1995, AGI prepared a Project Status Report for submittal to' KCEHSD. The report indicated that significant hydrocarbon removal had been accomplished and that further active remediation was not required. KCEHSD agreed with the recommendation to discontinue active remediation and requested vadose zone .confirmation borings and continuation of quarterly groundwater monitoring. On January 16, 1996, AGI advanced six (6) confirmation'boring to determine whether remediation of the vadose zone was complete. Confirmation borings C-1, C-3, C-4 and C-6 were advanced to 17.5 feet (capillary fringe) and C-2 and C-5 to 20 feet (saturated zone). Twenty-six (26) soil samples were collected and submitted for analysis. TPH as gasoline was detected in only two (2) of the twenty-six (26) soil samples at concentrations of 0.57 and 2.28 mg/kg, respectively. TPH as diesel, Benzene, Toluene, and' Ethylbenzene were non-detected in all (26) soil samples submitted for analysis. · Total xylenes were detected in [hree (3) of the (26) soil samples at co,%enlrations ol 0.0tl, 0.0!8, and 0.023 mg/kg, respectively. These analytical results indicated that remediatio¢, of the vadose zone and underlying capillary fringe has been completed. Historical groundwater analytical data indicated, that beginning with the third quarter of 1995, groundwater beneath the site had been remediated to non-detectable concentrations for TPH as gasoline, TPH as diesel, and BTEX components. These analytical results were confirmed by fourth quarter, 1995 analytical results. A notable exception were the relatively high concentrations reported for MW-14A which is located approximately 690 feet downgradient.of the Davies Oil site. ' On the basis of Iow to non-detect concentrations in groundwater on-site being reported for two consecutive quarters coupled with a rise in groundwater elevation, the number of wells in the monitoring program were reduced to six (6). First quarter, 1996 groundwater analytical results indicated Iow but detectable concentrations, below State of California MCI's, of Toluene and Xylenes. Analytical results for MW-14A, located off-site and downgradient, indicated Xylenes above the MCL and moderately ~,~,,~, "r~u,., ,-,, ~,,,,,.,.,.,,.,.,,4 .... ""'*'"*~""" '"' ~"'"'"' quarter, 1995 results.. Based on the results of the confirmation borings, review of the project history, and results of the soil and groundwater remediation activities, soil and groundwater has been successfully remediated and the risk of continued degradation of groundwater resources from the site is negligible. 2.0 BACKGROUND The following sections include a facility description and a chronology of the project to date. 2.1 Facility Description Davies Oil is located at 3305 1/2 Gulf Street in the City of Bakersfield, Kern County, California (Exhibit 1). The site is currently operated as a gasoline, diesel and · compressed natural gas (CNG) dispensing service station and contains two gasoline and four diesel dispenser islands, along with an office complex and CNG facility. The site is surrounded by light industrial operations and residential property. The facility is shown to scale on Exhibit 2. 2.2 Project History During the winter of 1985, inventory records first detected product losses from the regular-gasoline dispensing system. In response to these losses, a pressure test was conducted on the tank and lines which indicated a leak in the regular-gasoline product lines. The suspect faulty line was repaired, but shortly thereafter, inventory records again indicated product losses. The tankS and lines were tested again on March 3, 1986 where a leak in the vapor lines was detected then subsequently repaired. On ,July 1987, Twin Cities Testing Corporation estimated 2,500 gallons of regular-gasoline may have been lost on site. Shortly thereafter, Davies Oil contacted KCEHSD and apprised them of the situation. In October 1986, three (3) 10,000 gallon underground storage tanks were removed from the Davies facility because they were no longer in use. According to the KCEHSD, diesel fuel was detected in soil samples obtained dudng the excavation. Information generated by several prior consultants including Delta Environmental Consultants, Inc., Aegis Environmental, Inc., and Associated Soil Analysis, Inc. revealed the presence of both soil and groundwater contamination by gasoline range hydrocarbons at the subject site. A total of seventeen (17) groundwater monitoring wells, (nine (9) two inch and eight (8) four inch diameter) have been installed on and off-site. Additionally, there are two groundwater recovery wells, one 12-inch and one 6-. inch diameter, designated as RW-1 and MW-12a. A groundwater treatment system was installed that consisted of a packed column air stripper for dissolved phase ~"'~ ..... "' ......... '.arid. two carbon filters in line,.,,"'* the efflu,.,,,t.~,.,,,'o" '"","' prior to discharge to an on-site infiltration gallery. During installation and operation of the treatment system in 1988 and 1989, the water table was relatively stable between 18 and 22 feet below ground surface (bgs). In February of 1990, the water table dropped below the bottom of the groundwater recovery well at 36 feet bgs due to regional drought conditions, rendering the remediation equipment temporarily inoperative. In November of 1988, hydraulic conductivity tests were performed by Delta Environmental Consultants, Inc. This test was performed on RW-1 using a short duration pump test. Transmissivity was estimated to be 12,000 gpd/ft and hydraulic conductivity was calculated at 70 ft/day. A soil vapor survey was conducted in November 1990 to establish the limits of hydrocarbon vapors in the soil. In January 1991, three (3) 4-inch diameter monitoring wells were installed down gradient of the plume (MW-13, MW-14, and MW-15) and one 4-inch well upgradient (MW-16) at the northern boundary of the property. Well depths ranged from 48.5 feet'to'-55.0 feet bgs. Groundwater analyses revealed benzene contamination above State Action Levels (SAL) in down gradient wells MW-13, MW-14, and MW-15. Upgradient well MW-16 was reported as non-detect ('ND) for all analytes. MW-14 was reported to contain the highest concentrations of dissolved hydrocarbons. All four groundwater monitoring wells became dry in April 1991 due to a continuing decline of the water table. The deepest well was MW-13, completed to a depth of 55 feet bgs. In March 1992, four of the groundwater monitoring wells were twinned with deeper wells screened from 30 to 60 feet bgs to accommodate the declining water table. The new wells were designated MW-la, MW-11a, MW-12a, and MW-14a. All wells were completed with 4-inch Schedule 40 PVC casing and liner, except for MW-12a, which was comple[ed with 6-inch diameter PVC casing. A pump test 'was conducted on MW- "12a before plumbing it to the air stripper tower on-site. The groundwater remediation unit was apparently re-started in fall 1992, but due to Iow flow rates, high drawdown, and a continuing decline in the water table, was shut down once again a few months later near the end of 1992. The project was apparently idle from 12/92 to 9/93. In September 1993, AGI was retained by Davies Oil to begin quarterly groundwater monitoring, develop and implement a Remedial Action Plan. On April 4, 1994 the KCEHSD approved the Remedial Action Plan submitted by AGI. An addendum to the Remedial Action Plan was then submitted in late .April, 1994 which included air sparging of the groundwater which was later approved by the KCEHSD on June 10, 1994. On July 7, 1994, AGI installed ten (10) air sparge wells along the southwest portion of the Davies Facility. On July 11, 1994 through August 4, 1994, AGI began trenching, manifolding, and plumbing the air sparge wells to an oil-free compressor. Six (6) on- site groundwater monitoring .or groundwater recovery wells were converted to vapor extraction wells and connected to a Vapor Extraction System. The Fire Cat 250 CFM ........ ,.,., .,... ...................... ~"~ .'""'"'"~+~"'"'-of the. Air ,,~,,.,, ~,.,, ......... ~,.,,, on August 4, 1994. AGI conducted regular system maintenance and operations throughout the project. In September, 1995, AGI, in the September, 1995 Quarterly Groundwater Monitoring Report, concluded that the groundwater analytical data coupled with a rising .groundwater table and Iow vapor influent concentrations indicated that the remediation at the site was nearing completion. Based upon these factors, AGI recommended discontinuing the air sparge operations, running the vapor extraction system on a cyclic basis, and advancing confirmatory soil borings when extracted vapors were at 1% of the LEL for gasoline (approx. 140 ppmv). On October 3, 1995, KCEHSD drafted a letter in response, to AGI's recommendations. The latter stated that they tended to agree with AGI's recommendations, however, KCEHSD requested submittal of a vapor extraction system performance report prior to evaluating the site for closure. In November, 1995, AGI submitted the requested Project Status Report. The report indicated that the system had removed the vapor equivalent of approximately 8,200 gallons of gasoline from the vadose zone and groundwater at the site. Vapor stream influent concentrations had fallen to below 2% of the gasoline LEL, and concentrations of dissolved petroleum hydrocarbons in groundwater had decreased to non- detectable concentrations in all but one (1) on-site groundwater monitoring well. The report also included recommendations to discontinue active remediation, advance vadose zone confirmation borings, and conduct additional quarterly groundwater monitoring. On November 28, 1995, KCEHSD issued a letter concurring with AGi's recommendations and required a brief workplan for the confirmation borings. A workplan for fhe c~)nfirmation borings was submitted in December, 1995 and approved on January 9, 1996. Additionally, the December, 1995 quarterly groundwater monitoring report was submitted to the KCEHSD in January, 1996. Groundwater analytical results were reported as non-detected to below MCL's for all wells sampled (monitoring well MW-14A contained moderately elevated concentrations of xylene and TPH as gasoline). Remediation was discontinued in early January, 1996 and the groundwater monitoring requirement was decreased to include six (6) monitoring wells. On January 16, 1996 AGI advanced six (6) confirmation borings (C-1, C-2, C-3, C-4, C- 5 and C-6) in the area .of known soil contamination. Exhibit 3 depicts the locations of the confirmation borings in relationship to former monitoring wells and air sparge wells. A final round of groundwater monitoring was also performed on February 12, 1996 on monitoring wells MW-l, MW-2, MW-3, MW-11a, MW-12a and MW-14a.. 3,0 SITE GEOLOGY AND HYDROLOGY 3.1 Site GeologY The sediments underlying the site are Quaternary alluvial and fluvial deposits consisting of unconsolidated fine- to coarse-grained sands and sandy silts (Calif. Div. of Mines and Geol., 19 6 4). The soil in the subsurface encountered from previous work and the confirmation borings consists of well graded to poorly graded sands and gravels to a depth of approximately 65 feet below ground surface (bgs). 3.2 Site Hydrogeology Published data (KCWA, 1990~ shows the site is located near a region of artificially created groundwater mounding. The mounding is presumably a result of groundwater recharge from large surface holding ponds in association with a water purification -plant, located approximately 1/4 mile to the northeast. The regional groundwater gradient beneath the site is to the southwest. Previous work at the site indicated the depth to groundwater remained between 14 to 19 feet bgs from July 1986 to March 1989. In subsequent years the depth to groundwater progressively increased, resulting in the drying of several monitoring wells. The continuous drop in groundwater level is believed, in part, to be a 'California Division of Mines and Geology, 1964, Geologic Map Bakersfield Sheet ~Kern County Water Agency, 1990, Improvement District No. 4, Water Conditions.. of California, 1989-Report on consequence of prolonged regional drought conditions which existed throughout central and southern California from about 1986 to 1992. In September, 1992 the average depth to groundwater at the site was approximately 35 feet bgs. Between 1993 and 1994 the average depth to groundwater rose to approximately 27 feet bgs beneath the site. Due to the unusually wet winter of 1994-1995, groundwater elevations rose to an average depth of 18 feet bgs. In February, 1995, AGI personnel collected groundwater measurements at the site from the existing monitoring wells (Table 1). Groundwater measurements collected on February 12, 1996 show the depth to groundwater has an average depth of 18.46 feet bgs, a decrease of approximately 0.8 feet in groundwater elevation from November, 1995. The groundwater gradient in February, 1996 was 0.02 ft/ft with an overall southwesterly flow direction (Exhibit 4). An area of flattening of the groundwater surface has historically existed between the onsite wells and the groundwater monitoring wells located to the southwest near Pierce Road. The groundwater surface constructed from the February monitoring event also indicates a difference in water levels measured in onsite wells, and the wells located along Pierce Road. The groundwater flow..dirootion..is consistent, between....the two. !ocat. ions, however, the difference between the on- and offsite wells may represent partial or separate hydrogeologic flow conditions between the two areas. Historical groundwater elevation data are' included in Appendix E. Table 1 Groundwater Elevations Monitoring Reference Total Depth to Groundwater Well Elevation Depth Groundwater Elevation # (ft) (ft) (ft) (ft) MW-la 408.10 61.50 18.05 390.05 MW-2 411.31 24.30 19.90 389.41 MW-3 410.22 23.70 19.77 390.45 MW-4 409.72 23.62 19.54 390.18 MW-5 407.62 23.32 17.38 390.24 MW-8 409.68 23.63 19.88 389.80 MW-10 408.12 27.00 17.88 390.24 MWlla 407.58 68.84 17.80 389.78 MW-123 NA 63.36 17.83 NA MW-! 3 409.91 48.00 !8.91 39!.00 I'" IMw-14a 406,79 62,50 18,21 388,58 iMW-15 409.78 48.50 18.24 391.54 IM NA= Not Available 4.0 FIELD PROCEDURES AGI advanced six (6) confirmation borings at the Davies Oil site to determine whether remediation of the vadose zone was complete. Borings C-1, C-3, C-4 and C-6 were advanced to 17 feet (capillary fringe) while borings C-2 and C-5 were advanced to 20 feet (three feet into groundwater saturated soil). Exhibit 3 shows locations of all six confirmation borings. -.- AGI Pedormed a groundwater sampling event on February 12, 1996. The results of the groundwater monitoring event are included in this report to assess the results of the soil and groundwater remediation at the site. Monitoring wells MW-la, MW-2, MW-3, MW-11a, MW-12a and MW-14a were sampled as part of the February, 1996 monitoring event. The following sections describe in detail the procedures methods used in the soil and groundwater sampling and analysis. 4. I Boring Methods Six (6) soil borings, C-1 through C-6, were advanced using a CME-75 rig with a eight inch diameter hollow stem continuous flight auger in accordance with ASTM Method D-1452-80 for soil investigations and sampling by auger borings. The augers were steam cleaned prior to advancing the boring. The lithology and other pertinent data were recorded on field boring logs (Appendix A) in accordance with Method D 2488- 84 for visual description and identification of soils. The soil borings were abandoned by placement of a three foot plug of bentonite chips in the bottom of each boring, compaction of cuttings back into the borehole, and the place of a cement cap on the final six inches of each borehole. 4.2 Soil Sampling Soil samples were collected through the auger in two (2) inch diameter brass sleeves driven in a split-spoon sampler by a 140-pound hammer with a 30-inch drop in accordance with ASTM methods D1586-84 for split-barrel sampling of soil and D1587- 8'~ ~'"" + ~" "o'o tubo" r ,.,. .... h,, ,-,,,,.,,.,,.,d ,,amp,mu of soils. Prior to sampling, the core barrel was loaded with three brass sleeves. In general, upon collection, the lowermost sample sleeve was capped, sealed, labeled in accordance with EPA protocols, recorded on a Chain-of-Custody form, and stored in an iced cooler at four degrees centigrade (4°C) or less, pending analysis by Halcyon Laboratories, a laboratory certified by the Department of Health Services, State of California. The middle and top sample sleeves were used for lithologic description and for field hydrocarbon screenin, g. In all cases, soil samples were collected at five foot intervals beginning at a depth of five feet. The blow counts, recovery, and lithology were recorded on field boring logs (Appendix A). The lithology was described by an experienced environmental geologist, working under the supervision of a California Registered Geologist in accordance with the Unified Soils Classification System and ASTM procedure D2488- 84 for visual description and identification of soils. The sampler was washed in a Alconox solution and double rinsed-in potable water prior to each use to prevent cross-contamination. 4.3 Field Screening of Soil Samples A portion of soil was removed from each core sample and examined for stain and odor. The remaining soil in the sleeve was agitated, the sleeve was then capped and a headspace reading was taken by inserting the probe of a Foxboro Model 128 hydrogen flame-ionizing detector (FID) through the cap. Hydrocarbon screening information was recorded on the boring logs. .. The soil sampling and field screening procedures described above were conducted in accordance with accepted standards of care prevalent at this time and were performed to ensure the acquisition of accurate data. Soil samples selected for chemical analysis were capped with an aluminum foil liner and HDPE caps, labeled with sample identification, date, time, sampler, analyses requested, and transported in a cooler at 4°C to Halcyon Laboratories with the Chain-of-Custody for the specified analyses. 4.4 Groundwater Elevation Groundwater elevation data was collected from Monitoring Wells MW-la, MW-2, MW-3, MW-4, MW-5, MW-8, MW-10, MW-11a, MW-12a, MW-13, MW-14a and MW-16. The depth of freestanding groundwater was measured to the nearest one hundredth (0.01) of a foot using a Solinst water level indicator. The Solinst water level indicator and attached measuring tape were washed in TSP and rinsed prior to each use. The referenced top of casing measurements used to determine the groundwater ,-,I,',~/~ti,~ne ~A,,-,re..n,-,n,-,t~tcH by Delta ~,,,,;,,-,r,,-~,,,~*o~ Consultants Inc. elevations are referenced to a bench mark located near the fenced corner at the northeast end of Gulf Street. The bench mark consists of a white wood post marked with an elevation of 409.50 feet above mean sea level. Measurements and reference elevations were marked from the north top edge of each well casing. 4.5 Groundwater Monitoring Well Purging In accordance with AGI's request and KCEHSD's approval to reduce the number of' groundwater monitoring wells to be sampled, a total of six (6) monitoring wells were in~,luded in the February, 1996 sampling event. The wells sampled were monitoring ~,.iis MW-la, MW-2, MW-3, MW-11a, MW-12a, and MW-14a and are shown on Exhibit 4. Three (3) well casing volumes were removed from each well prior to sampling using a submersible purge pump. The volume of water to be removed was calculated by subtracting the depth to groundwater from the total depth of the well and multiplying by the cross sectional area of the well casing. Water temperature, pH, and conductivity were measured after the-removal of each well volume. When the groundwater measurements were' within 10% of previous measurements, the well was considered sufficiently purged for groundwater sampling. The purge data sheets documenting the field results are included as Appendix C. 4.6 Groundwater'Sample Collection A groundwater sample from each monitoring well was collected for laboratory analyses following the purging of the well. Groundwater samples were collected by lowering a disposable PVC bailer into each monitoring well. Two (2) 40-milliliter amber' VOA vials and a one (1) liter amber bottle were filled with the collected groundwater and sealed with teflon-lined lids. Care was taken to ensure no headspace or air remained trapped within the vial when sealed..The wa[er samples were immediately placed in an iced cooler at 4° centigrade for storage and transport.. The samples were logged on a chain of custody document, and transported to Halcyon. a California certified laboratory for chemical analyses. 4.7 Chemical Analyses A total of twenty six (26) soil samples were selected for analysis and submitted to Halcyon Laboratory, a California State Certified Laboratory in accordance with state guidelines and EPA protocols. All samples were analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg), Total Petroleum Hydrocarbons as diesel (TPHd) and volatile aromatics (BTEX) using EPA Method 8015 modified and 8020, respectively. Analytical data sheets and chain of custody documents are presented in Appendix B. A total of six (6) groundwater samples were collected and submitted for analysis by Halcyon Laboratory, a State certified laboratory, in accordance with State guidelines a~d EPA protocols. The groundwater s~mp.!es.were.a.~alyzed..for. Tota! Petro!eum Hydrocarbons as gasoline (TPHg) and Volatile Aromatics: Benzene, Toluene, Ethyl- benzene, and Total Xylenes (BTEX) using DHS Luft Method/8015M and EPA Method 8020, respectively. The laboratory reports and chain of custody documents for these samples are included in Appendix D. 5.0 RESULTS The following summarizes the results of the confirmation borings and groundwater monitoring event. 5. I Confirmation Borings On January 16, 1996, AGI advanced six (6) confirmation bodngs, designated as C-1 ,C- 2, C-3, Co4, C-5 and C-6 (Exhibit 3), to depths from 17 and 20 ft bgs. Confirmation boring C-1 was located approximately 40 feet east of monitoring well MW-2. Confirmation borings C-2---and C-3 were located just north of MW-12a and MW-11a, respectively. Boring C-4 was located 40 feet north of recovery well RW-1. Confirmation boring C-5 was located between MW-la and the southern dispenser island. Boring C-6 was located just northwest of MW-10. Field observations of staining, petroleum odor, and FID measurements were recorded during the advancement of the soil borings to assess the presence of hydrocarbon contamination. Table 2 summarizes the analytical results for confirmation borings C~1 through C-6. The laboratory reports and accompanying chain of custodys are found in Appendix B of this report: TABLE 2 Soil Analyses for Confirmation Borings C-1 through C-6 Confirmation Depth TPHg TPHd BenzeneToluene Ethyl- Xylenes Boring benzene (ft) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) C-1 '5' hi3 ND ND ND ND ND tO' ND ND ND ND ND ND 15' ND ND ND ND ND NE) 17' Iq3 t',i3 ND I',D hi3 ND C-2 5' ND ND ND ND ND ND 10' ND ND ND ND ND ND 15' ND ND ND ND ND ND 17' ND ND ND hi:) ND NO 20' ND ND ND ND hD ND C-3 5' ND ND ND ND ND 0.023 10' N:) ND ND ND ND NO 15' ND ND ND ND ND ND 17' ND ND ND ND ND ND C-4 5' 0..57 ND ~ ND ND 0.018 10' ND ND ND ND ND ND t5' ND ND ND ND ND 0.011 17' 2.28 N:) ND ND ND ND C-5 5' N:) hD ND ND ND ND 10' ND ND ND ND ND ltd 15' I~) ND ND ND ND ND 17' ~ ND .ND ND ND ND 20' hD. hD hD hD hD ND C-6 5' N:) hD iq3 hD hD ND 10' hD hD hi3 ND hD ND 15' hD ND hD ND ND ND 17' ND ND ND ND ND ND Detection Limit: TPHg (0.5), TPHd (1), Benzene (d.005), Toluene (0.005), Ethylebenzene (0.005), Total Xylenes (0.005) All analyses in rog/kg (ppm) ND= Non Detected Results of the confirmation borings indicate successful remediation of the vadose zone. Soil samples analyzed were non-detect for TPH diesel, Benzene, Toluene, and Ethyl-benzene for all six confirmation borings. TPH gasoline was detected in only one of the six borings, C-4, and ranged from non-detected to 2.28 ppm. Total Xylenes were detected in borings C-3 and C-4 with concentrations ranging from non-detected to 0.023 ppb. Natural biodegradation and attenuation of the minor concentrations detected should continue to occur and will further reduce any potential risk to groundwater quality. 5.2 Groundwater Monitoring Table 3 shows the results of the February, 1996 groundwater sampling event and are plotted on Exhibit 5. Historical groundwater analytical results for the wells are summarized in Appendix F. Of the six. (6) monitoring wells sampled, five (5) were located onsite, wells MW-1 a, MW- 2, MW-3, MW-11a, and MW-12a, and one was located offsite on Pierce Road. All six wells were non-detect for Benzene concentrations and all onsite wells were non- detect for Ethyl-benzene. Concentrations of TPH gasoline were detected onsite in wells MW-2 and MW-12a with 82 to 1,700 ppb, respectively. Toluene was detected in the onsite wells at concentrations ranging from 0.6 to 5.9 ppb. Total Xylenes were detected in the onsite wells at concentrations ranging from non-detect to 1.6 ppb. The offsite well MW-14a, is located approximately 690 ft downgradient along Pierce Road. Concentrations of TPH gasoline, Toluene, Ethyl-benzene, and Total Xylene were detected at concentrations of 21,000, 8.7, 1.3, and 2,000 ppb, respectively. Well MW-14a was non-dete~ for Benzene..- The.contaminants found in groundwater at the MW~14a location are likely due to a source other than the Davies Oil site for the following reasons. While onsite concentrations have decreased, concent;'ations at well MW-14a have increased and that well MW-'14a is loCated approximately 690 ft from the site, with a hydrogeologic unconformity, indicated by the unusual potentiometry, between the site and well MW-14a. TABLE 3 Groundwater Analysis Results Monitoring Benzene Toluene Ethyl- Total Xylene TPHG Well No. (ppb) (ppb) Benzene (ppb) (ppb) (ppb) MW-la ND MW-2 '~ ND MW-3 ND MW-1 1 a ND MW-12a ND MW-14a ND 43 06 59 23 13 87 ND 1.4 ND ND ND 8 2 ND 1.6 ND ND 1.3 ND ND 1.2 1 700 1.3 2000 21000 TPHG = Total Petroleum Hydrocarbons as Gasoline ND = Below Practical Quantitation Limits PQL= Practical Quantitation Limits TPH(gasoline) = 50 ppb BTEX = O.5 ppb 6.0 DISCUSSION 6.1 Vadose Zone Vapor extraction and groundwater air sparging was conducted from August 4, 1994 to January 2, 1996. During operation of the vapor extraction and air sparging system,. several operational parameters were recorded including, influent concentration expressed as a percentage of the Lower Explosive Limit (LEL), influent flow rate, and hours of operation. Exhibit 6 graphically depicts a plot of percent of LEL versus time for the remediation period. At startup of the system, influem concentrations were as high as 60% LEL but dropped to approximately 40% LEL after a few days of continuous operation. In mid-October, 1994, the influent concentrations had stabilized between 15% to 20% LEL. Influent concentrations sharply decreased in March, 1995 to approximately 5% LEL and maintained this concentration until September, 1995. In September, 1995, the influent ........ ~l I~ '/"~ ~1 concentra~i''''~ had _..~ m~.tob~.all~, reached 2% LEL or !ess suggesting that continued remediation had reached diminishing returns and soil and groundwater contamination had been reduced to non-detect or Iow concentrations. Based on flow, influent conCentrations, and operating hours, AGI calculated a total of 8,400 gallons of gasoline were removed and processed during the remediation period. Exhibit 7 graphically depicts the rate of gasoline removal based on a total of 8,400 gallons of gasoline initially being present in the soil and groundwater Confirmation borings advanced at the site have indicated that vapor extraction has successfully and completely remediated the vadose zone. With the exception of minor concentrations of TPHg and Total Xylenes in confirmation boring C-4 (2.28 ppm for TPHg and' 0.018 ppm for xylenes) and an insignificant concentration of 0.023 ppm for Xylenes in C-3, all other samples were non-detected.for the constituents analyzed. Due to the lack of hydrocarbon constituents detected in the confirmation boring samples, the risk to potential receptors and the surface environment from vapors migrating upward from the-soil are nonexistent. The risk of continuing degradation of groundwater resources via migration from the vadose zone and capillary fringe are also negligible. 6.2 Groundwater Groundwater monitoring wells MW-la, MW-2, MW-3, MW-11a, MW-12a and MW-14a were sampled during the latest quarterly monitoring period. Five out of the above six wells (MW-la, MW-2, MW-3, MW-11a and MW-12a) are located on site at the Davies Oil facility. Although groundwater from these wells contained minor concentrations of Toluene (0.6 to 5.9 ppb) and Xylenes (non-detected to 1.6 ppb), groundwater analytical results are below Maximum Concentration Levels (MCLs) set by the State of California Water Resources Control Board. Monitoring results for well MW-14a indicated an increase in Xylenes and TPHg. In November 1995, Xylenes concentrations were 430 ppb while TPHg concentrations were 810 ppb. February, 1996 monitoring event results indicated Xylenes and TPHg groundwater concentrations of 21,000 and 2,000 ppb in well MW-14a, respectively. The Xylenes groundwater concentration detected in well MW-14a exceed the MCL set by the State of California. The lack of significant light end BTEX (benzene and toluene) coupled with the high concentration of TPHg suggests a highly degraded gasoline impact to groundwater in this area. The contaminants found in groundwater at the MW-14a location are likely due to a source other than the Davies Oil site. While onsite concentrations have decreased, concentrations at well MW-14a have increased in concentration. Additionally, well MW-14a is located, approximately 690 ft from the.site, with a hydrogeologic unconformity, indicated by the unusual potentiometry, between the site and well MW- 14a. 7.0 CONCLUSIONS Based on the results of the confirmation borings, C-1 through C-6, review of the project history, and results of soil and groundwater remediation activities, AGI makes the following conclusions: Remediation activities including vapor extraction and groundwater air sparging have successfully and completely remediated the vadose zone and associated groundwater contaminant plume. Current soil concentrations of petroleum hydrocarbons are either non-detect or very Iow and do' not pose a risk to degradation of the groundwater quality beneath the site. Airsparging coupled with vapor extraction have reduced groundwater concentrations onsite to non-detect or below the Maximum Contaminant Levels set by the State of California Water Resources Control Board. Increased concentrations of TPH gasoline and Total Xylenes were indicated in well MW-14a, however these results are likely due to a source offsite and unrelated to the Davies Oil Company site. :Id Based on the conclusions of the confirmation borings, C-1 through C-6, review of the project history, and results of soil and groundwater remediation activities, AGI recommends closure for the site. 8.0 LIMITATIONS AquaGeosciences, Inc. performed this investigation in accordance with generally accepted standards of care which exists in California at this time. It should be recognized that definition and evaluation of geologic conditions is a difficult and inexact science. Judgments leading to conclusions and recommendations are generally made with limited knowledge of the subsurface conditions present. No warranty expressed of implied, is made. EXHIBITS SITE LOCATION W~:$T ICOLU~4 BU.( ,,' J Scale No~h i ',Vestwind Drive Suite 103 .-Id, California 93301 .'!ephcne: (805) 32.8-0962 Fax 328-1129 Davies Oil Company 3305 1/2 Gulf Street Bakersfield, California VICINITY iqAP PIERCE ROAD ParkingAma 4~MW. 14A'MW' 14 . MW-13 .4~- II I Rush Swoapc · q:: ::::::::::::::::: ::::::::::::::::::::::::::::::: :::::::::::::::3:~q ! !iiiii!ij~i{ii~ii!:ii:!ii:i: ' N::':" ' '" ...... ~ ....................................................................... i .............................................................. i!iiil;iiiiiiiii!i!iiii;,ii;?! i i iil i i i! i i [ ii i i~ i i ! ;iiiiili!iiiiiiiili;!iiiiii!il Wash ~v.~ W~ I ~:.~:~:.:::~:.:~::~:.:::.~:.~.: ~: .' ~ '~f:~::~::~:::-::~::~::~::~ ~~ ~ ~ :::::::::::::::::::::::::::::::::::::::::: ~ [ ~:.;:: ............................. ::::::::::::::::::::::::::::::: ~s I ~ ~ ,~;~;~;~'~i/~f~ I ~d ~ ~ :::::::::::::::::::::::::::::::: - :: ::::::::::::::::::::: :.:.:.:.:.:.:.:.... :.:.:.... ::::::::::::::::::::::::::::::::: ~-ll :: ...... ~-' ' Davies OilG~mpany ~ North [ ~Un~d ~ ~mp Scale 1 ~ 125' ~ ~-44 s~.~,T~ m ~ ~/////[~. Infihrafioa I II AquaGoosdencos, In~. DAVIS OIL COMPANY EXHIBIT 4440 ~d~om Stmot, ~dto ~ 00 BAKERmF~LD, CALIFO~A Bakersfield, California 93313 ' 2 Telephone: (805) 836-8100 PLOT PLAN MAP Fax: (805) 836-8800 ,, ./ ,~'~.'~ ~ II I II I I III IIII I I I I I I III .~g .~ MW-2 Underground MW-5 - Storage I MW-12a Tanks I: ~' 11 :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Stor:~ge ~-I ~ :~??~?.~?~?:::~?:~?:~5::::~ Natural Gas ~w-8 ~ [ ......... ~ ~...~, ~ ~ ~ '~ m Da~i~ Oil Company Y N~-~ ~Hnder~ound ~ ~mp ~-4 ~ StomgeTa~ ~ Islands lffiiltmtion Galle~  Monitoring Well Confi~ation Scale 1 ~= 62.5' ! I Boring III I I II llll I I ~quaGooscioncos, Inc. DAVIS OIL COMPANY EXHIBIT 1701 Wostwind ~vo, Suito 103 BAKERSF~LD, CAL~ONIA California 93301 3 Bakersfield, Tolephono: (805)328-0962 COgitATION BORING LOCATIONS Fax: (805) 32801129 Illl alii I I I I I II II III I I .... -- -' I I I II Ir ' ' '~ II I PIERCE ROAD ~ : ....... : ::... ~ .......... ::.: :.:.:.::. :...... ,..::::. ::... ======================= :.::.~:. . I :::.: :: :::.: :~:~:~:~:~?:~:~::~:~:~:~: :~:~:~:::~ ~ " ~:~:~:~:~:~:~:~:~:~:~:~:~:~:~ ' Key ..... ' .~ -1 I I II I ~quaGooscioncos, Inc. DAVIES OIL CO'ANY 4440 Gfissom St., Suito 100 BAKERSFIELD, CALIFO~IA Bakorsfiold, California 03313 lolop,ono: (8o5) 8a~-ol 0o Potentiome~ic Map Fax: (805) 830-8800 February 12, 1996 Ill PIERCE ROAD Parking '~ MW-14a MW- 13 I Area .~. I [ Rush Swoape [21000 ppb i I ~ NS ~ ~:~::: Local Union ~ Pump Iafd~rafion G~fl¢~ AquaGeosciences, lnc. DAVI $ OIL COMPANY EXHIBIT 4440 ~rissom St., Suite ~ 00 BAKERSFIELD, CALIFO~A Bakersfield, Galifornia 933~ 3 5 Tolopho,~: t~os~ ~3~-~oo Groundwater -TPHg Concentration Contour Map for February 12, 1996 Fax: (805) 836-8800 III II I I I II I II IIIIIII II II I Davies Oil Facih.~(Gulf Street-Bakersfield) Average Daily LEL (%) Throughput 45i.~'~ _~ · Data prints depicted by LEL = O ~ represent days when equipment is shut do~ for regular maintenance or breakdown 40 · Total in-operation days is approximately 433 days. Total downtime is ,11 days. 35 ~ 30-- ~ m 202- ~ > 15~- ~0~. ,...,... , , . ,,., , , _., ,.. TI~E I I I I I AquaGeosciences, Inc. DAVIS O~ CO~A~ 4440 Grissom St., Suite 100~...~.~.~~ Bakersfield, California 93313 , T.~Pho.~: (8o~)~6-8~oo Vapor ~xtmction- LEL verses Time Fax: (805) 836-8800 II I I I II I I I -- I I IIII II I I II · 9000 8000 7000 6000 5000 4000 3000 2oo0 1000 DAVIES OIL FACILITY(GULF STREET-BAKERSFIELD) STATUS OF SOIL AND GROUNDWATER REMEDIATION · Since no information on the amount of gasoline in soil/groundwater is available and for the Purpose of (]eneratin(] this oraDh, an initial volume of gasoline was assumed to be 8.4 0 0 gallons. · Approximate volume of gasoline extracted is 8.400 gallons. · Average daily extraction is approximately 1 9.1 gallon/day. AquaGeosciences, Inc. 4440 Grissom St., Suite 100 Bakersfield, California 93313 Telephone: (805) 836-8100 Fax: (805) 836-8800 TIME ]I)AVIB OIL COMIFA!qY BAKERSFIELD, CALIFORNIA Vapor Extraction - Gallons of Gasoline Extracted over. Time III I I EXHIBIT 7 APPENDIX A CONFIRMATION BORING LOGS -oral depth of boring: Casing diameter: Screen diameter: Drilling company: Method used: 17.5' Diameter of boring: 6" Date 1 / 1 6/96 Length: .... Slot size: Length: ......... Material type: Soils Engineering, Inc. Project Geologist P. McCullou~h Hollow Stem Auger Signature of Registered Professional:. P. Goalwin Registration No.: 4779 State: CA' I I DEPTH SAMPLE 3LOWS P.I.D.U.S.C.S. DESCRIPTION ILITHO IWELL CODEI TYPEICONS'r -0- NO. Surface 3 SAND, fine to coarse grad, orange to buf[:;~.:.~;;.~:t -4- ~ 4 0 SW -6- 4 damp, no plasticity, no odor, no Stain F~i"."~:~ '8- 3 -10- ~ 4 0 SM/ML SANDY SILT, very fine to fine grade, I'~]11111 brown, damp, no plasticity, no odor, -1 2- 5 no stain SAND, medium grade, orange to buff, -14- 5 SP damp, no plasticity, no odor, no stain I~ 7 0 SILTY SAND, med. grade, brown, damp, ~1111111111 -1 6- 6 ML no plasticity, no odor, no stain 1 6-17.5 0 SM SANDY SILT, med. grade, brown, wet to ~'~1 -1 8- ... moist, no plasticity, no odor, no stain -?0- I~ TOTAL DEPth @ 17.5' -22- SW ML CL SP SM SC GP A0uaGeosciences, In(;. t · ~0 Gdssom Street, Suite 100 , .ersfield, California 93313 Telephone: (805) 836-8100 Fax 836-8800 Title DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA CONFIRMATION BORING C-1 Exhibit Total depth of boring: 20' Casing diameter: ......... Screen diameter: Drilling company: Method used: Diameter of boring: 6" Date 1/1 6/96 Length: Slot size: Length: ......... Material type: Soils Engineering, Inc. Project Geologist P. McCullough Hollow Stem Auger Signature of Registered Professional: P. Goalwin Registration No.: 4779 State: CA U.S.C.S. LITHO WELL DEPTHI SAMPLE BLOWS P.I.D. DESCRIPTION CODE TYPE CONST NO. Surface -4' 2 2 0  SM SAND, some silt, med. to v. fine grade, -6- 3 brown, damp, no odor, no stain 4 SANDY some silt, fine to v. fine grade, brown, damp, no odor, no stain 6 I~ 7 < 1 SW SAND, med. to coarse grade, orange to ;.%¥.%% -1 6- 8 buff, damp, no odor, no stain 1 6-17 6 <.1_ SW SILTY, 10% silt, med. to coarse grade, .4^-~u -J- 6 " brown, moist, v. sit. odor, no stain 6 GW SANDY, 40% gravel, v. coarse, brown :'. :.. :.. :.. :.. 6 to buff, wet, v. sit. odor, no stain :.t .? .?:.?: Key: ~ ~TI [=~ ~ ~ ~ ~ TOTAL DEPTH@20' SW ML CL SP SM SC GP A0uaGeosciences. In(;. ' ' ~0 Grissom Street, Suite 1 O0 .ersfield, California 93313 Telephone: (805) 836-8100 Fax 836-8800 Title DAVIES OIL COMPANY · BAKERSFIELD, CALiFORNiA CONFIRMATION. BORING C-2 Exhibit Total depth of boring:_ Casing diameter: Screen diameter: ....... Drilling company: Method used: 17' Diameter of boring: 6" Date 1/16/96 Length: ..... Slot size: Length:_ Material type: Soils Engineering, Inc. Project Geologist P. McCullough Hollow Stem Auger Signature of Registered Professional: P. Goalwin Registration No.: 4779 State: CA DEPTH SAMPLE ~LOWS P.I.D. U.S.C.S. DESCRIPTION ILITHO WELL CODE CONST NO. Surface -O- -2- ~4- 3  SAND, some silt, med. to v. fine grade, 5 0 SM/ML -6- 5 brown, damp, no odor, no stain -8- 4 SILT, some SAND, v. fine grade, -1 0- 5 0 NL mira brown, damp, no odor, no stain 5 -12- I~ SAND' fine to coarse grade, orange to F;~..¥.~;,., 6 0 SW -1 6- 7 buff, damp, no odor, no stain ~;,..~;~;,.,E.~:~.':.~, r;-:-; .,-; I.;,,;,,;,,",,,; -18- 15-17 4 4 <.!~ SM SAND, 20% silt, fine to med. grade, -J- 7 grey to It. grey, moist, v. sit. odor, v. sit. stain -22- TOTAL DEPTH @ 17' SW ML CL SP SM SC GP AquaGeosciences. In(;. ' ' 40 Grissom Street, Suite 1 O0 .ersfield, California 93313 Telephone: (805) 836-8100 Fax 836-8800 Title DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA CONFIRMATION BORING C-3 Exhibit Total depth of boring: 3 7' Diameter of boring: 6" Date 1/1 6/96 Casing diameter' Length: ..... Slot size: Screen diameter: Length:. Material type: Drilling company: ..... _S_oil_s_E_n_gineering, Inc. Project Geologist P. McCullouc~h Method used: Hollow Stem Auqer Signature of Registered Professional: P. Goalwin Registration No.: 4779 State: CA DEPTH SAMPLE ~LOWS P.I.D. U.S.C.S. DESCRIPTION LITHO WELL CODE TYPE CONST NO. Surface -0- -2- .,.~;~..s..s; 3 '.¥.~'i~'.~; -4- _1_ SAND, med. to v. fine grade, orange to .'.~;~..~..~., 6 0 SW .'.~'.~'.~;~: -6-"1' 6 buff, damp, no odor, no stain ...~;~..~..~; · -.' -.' -...~, '.~;~'.~;¥, SAND med. grade, buff, damp, no ~11 5 0 SP odor, no stain -12- -14- 4 SAND, med. grade, buff, damp, sit. ~11 6 <1 SP V. -1 6- 7 odor, no stain 3 ..;,:.,, 4 0 .. SW/SM SAND, 20% silt, med. to v. fine grade,..,.. -20- 5 buff to brown, wet to moist, no odor, no stain .;,;~ "'"" - 2 2- ":"-' TOTAL DEPTH @ 1 7' SW ML CL SP SM SC GP Ao. uaGeoscience$. Inc. ~ ' ~0 Gdssom Street, Suite 1 O0 ~ arsfield, California 93313 Telephone: (805) 836-8100 Fax 836-8800 Title DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA CONFIRMATION BORING C-4 Exhibit 'otal depth of boring: Casing diameter:. Screen diameter: Drilling company: Method used: 20' Diameter of boring: 6" Date 1/16/96 Length: ...... Slot size: Length:. Material type: Soils Engineering, Inc. Project Geologist P. McCullou~lh Hollow Stem Auqer Signature of Registered Professional: P. Goalwin Registration No.: 4779 State: C_A__ DEPTH SAMPLE 3LOWS P.I.D.U.S.C.S. DESCRIPTION LITHO WELL CODE TYPE CONST NO. Surface '0- .?- i~ SAND, med. grade, orange to buff, damp 4 0 SP no odor, no stain 3 SAND med. grade, orange to buff, ~ ~ 4 0 SP damp, no odor, no stain ~ -12- -1 4- 4 SARD, some ~ravel, med. to ~ravel 4 0 SP/SW ~rade, orange to buff, damp, no odor, no ~ ~ ~'~'~ -~ ~- 4 stain ~ :::::::::::::::::::::~:~ ~ S~D, 20~ silt, med. to fine ~rade, ~ ' 8- 7 '~ ~ SM orange to brown, moist, no odor, no :::~:~{g,: 7 -.0 .. stain S~SD, 20~ silt, med. to coarse ~rade, ~,~:~:~::~..~;,; -2 2- 11 23 5M/S~ orange to bm., wet, no odor, no stain ?:~'~' SW ML CL SP SM SC GP TOTAL DEPTH @ 20' A~.uaGeosciences, Inc. 4" 'O Grissom Street, Suite 100 ~.. rsfield, California 93313 Telephone: (805) 836-8100 Fax 836-8800 Title DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA CONFIRMATION BORING C-S Exhibit Total depth of boring: Casing diameter: .... Screen diameter: Drilling company: Method used: 17' Diameter of boring: 6" Date 1 / 1 6/96 Length: ..... Slot size: Length: ......... Material type: Soils Engineering, Inc. Project Geologist P. McCulloucjh Hollow Stem Auqer · Signature of Registered Professional: P. Goalwin Registration No.: 4779 State: CA DEPTH SAMPLE 3LOWS P.I.D.U,S.C.S; DESCRIPTION LITHO WELL CODE TYPE CONST NO. Surface -0- SAND, med. grade, orange to buff, damp,~' 5 0 SP no odor, no stain * ' ' ' · 4 SAND, 5% silt, med. to fine grade, -10- 4 0 SP/SM orange to brown, damp, no odor, no 5 stain -1 4- 4 SAND, fine grade, orange to brown, · · · · · · 4 0 SP damp, no odor, no stain -16- 6 - 1 8- 1 6-17 4 4 SM SAND, 20% silt, fine grade, orange to :':-'-'~-~--~ ~.~ J_L. 5 0 .. brown, wet, no odor, no stain !ili!ii!~;.:...::?.:i!i~i.!~,.:'!i~"f";"~'"'"~'""'""~i ~i~ TOTAL DEPTH @ 17' -22- SW ML CL SP SM SC GP Aa. uaGeosciences. In~;, *0 Gfissorn Street, Suite 100 .... ersfield, California 93313 Telephone: (805) 836-8100 Fax 836-8800 Title DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA CONFIRMATION BORING C-6 Exhibit APPENDIX B LABORATORY REPORTS AND CHAIN OF CUSTODY CONFIRMATION SOIL SAMPLES IIl~:,Laborat britS41!1 CHAIN OF CUSTODY AND ANALYSIS 4440 Grissom St. Suite 100, Bakersfield, CA 93313 (805) 836-8100 REQUEST CLIENT NAME ~a ~"eo,J'c .~ c..-/ '"Z~'...~-/ PRO,~EOT NAME D,~ ,,,-,',- .r o '/ d::o ADDRESS PROJECt' MANAGER /~. /"7( ~' .,,///~ed L FAX SAMPLE DATE/TIME SAMPLE DESCRIPYION. IDENTIFICATION I/ SAMPLED Matrix, container, etc... (~' ~'I.I_,.,~H")-. /o~J 5o:1 .r-?~/r,.,z,_., c-,z-/~ ' ,/._ x //1~ /~ ~ ., c't~r~rq~ Io.~. /' '/C :z- //o/ C - //,'¢1~ c ........ /I~ ~ I~ ~ qk, t~q-"-/ //zo /, /, C - Y'- / ///~,/~ (,,. /// ¢ /?~ /' // C ~- /5" ,'//~b¢ ..... I// ¢ /t c /, /~ , $,ONA_'TURE AND PRINTED NAME ,'~,~ ~ .'~/c' ~ c(-. //o ~.d SIGNATURE AND PRINTED NAME RECEIVED BY, L.~.~ L~') ~_~,.~/-- /_/7_¢~ RECEIVED BY, I tlllO 4440 Grissom St. Suite 100, Bakersfield, CA 93313 (805) 836-8100 CHAIN OF CUSTODY AND ANALYSIS REQUEST CLIENT NAME /~/ . ANALYSES REQUESTED REMARKS PROJECT NAME b~ ~.~,'c'J O,' / (O · q PHONE ~ }q PROJECT MANAGER ~ ~c~:.l/O~~ FAX ' SAMPLE DATE/TIME SAMPLE DESCRIPTIOn, IDENTIFICAT'ION N ~ SAMPLED Matrix,' conlalner, etc... ~ ~ ~UNOUISHED BY ~~..~.-O - (' * r/~f~.~ ~ time RELINOUISHED BY ............... Date i SIGNATURE A~ PRINTED NAME I~- ~ ,~ ~ ~ cZ,_ /[ ........ / .... ~ t L~ /~"'~r'~ 81ONATURE AND PRINTED NAME 810NA/URE AND PRINTED NAME ~ IJ'~'l ~ t~>t] ()~4]~ ' SIONATURE AND PRINTED NAME Halcyon Laboratories, Inc. Calirorma Department of Health Services Certificate No, 1920 Client: Address: City/State/ZiP: Phone: FAX: Attention: Sampled By: Analysis Performed: ,-~ qua Geoscienc~s 44-10 Gnssom St., Suite Bakersfield, CA 93313 (805) 836-8100 (805) 836-8800 P. McCullough Patrick McCullough Project ,~lame: Da',!es Matrix; Soil Analyst: Kim Daitey Date Received: Jan 17, 1996 Date o[ Analysis: 1-22-96 thru !-23-96 Date of this Report: Jan 24, 1996 Total Petroleum Hydrccarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 Lab Number: 96A31 96A32 96A33 96A34 96A35 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 18, 19.96 Jan 16, 1996 Sample Description: C-1-5' C-1-10' C-1-15' C-1-17' C-3-5' Units: rog/Kg mg/Kg mg/Kg rog/Kg rog/Kg TPH as Gasoline: ND ND ND ND ND MDL: 0.5 0.5 0.5 0.5 0.5 TPH as Diesel: ND ND ND ND ND MDL: 1 1 1 1 1 TRPH: NA MDL: NA NA NA NA MDL: ND: NA: Method Detection Limit- the !east amount of anal,/te that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. MichaelAic~omin[ - -' ~ '# '" Laborator~ Director 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805)836-8100 FAX: (805) 836-8800 Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1920 Client: Aqua Geosc~ences Address: 4440 Grissom St. Suite ~00 Cit¥tState/ZIP: Bakersfield. CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Attention: P. McCullough Sampled By: Patrick McCullough Analysis Performed: BTEX by purge and trap (EPA Method 5030/8020) Project Name: Davies Oil Co. Matrix: Soil Analyst: Kim Daile¥ Date Received: Jan 17, 1996 Date of Analysis: ~-22-96 Ihru 1-'23-96 Date o¢this Report: Jan 24. 1996 Lab Number: 96A31 96A32 96A33 96A34 96A35 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-1-5' C-1-10' C-1-15' C-1.17' .C-3-$' Units: mg/Kg rog/Kg mg/Kg mg/Kg mg/Kg Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Toluene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Ethyl Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Total Xylenes: ND ND ND NO 0.023 MDL: 0.005 0.005 0.005 0.005 0.005 MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported, Not Analyzed- analysis for this analyte was not performed. M~,'~ael Riccomini Laboratory Director 4 .-'HO. Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories. California Department of Health Seo/ices Certificate No. 1920 Client: Address: City/State/ZiP: Phone: FAX: Attention: Sampled By: Analysis Performed: ,},qua Geosciemces 4440 Grissom St. Suite Bakersfield, CA 93313 (805) 836-8100 (805) 836-8800 P. McCullough Patrick McCullough Project Name: Oa,/~es Od Cc Matrix: Soil Analyst: Kim Oailey Date Received: Jan 17. 1996 Date of Analysis: 1-22-96 thru 1-23-96 Date of this Report: Jan 24, !996 BTEX by purge and trap (EPA Method 5030/8020) Lab Number: 96A36 96A37 96A38 96A39 96A40 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-3.10' C-3-15' C-3-17' C-2-5' C-2-10' Unffs: rog/Kg rog/Kg rog/Kg rog/Kg mg/Kg Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Toluene: ND ND ND ND ND MDL: 0,005 0,005 0.005 0,005 0.005 Ethyl Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Total Xylenes: ND ND ND ND ND MDL: 0.005 0.005 0.005 0,005 0.005 MOL: ND: NA: Method Detection Limit- the least amount of anal~e that can be detected and report.ed. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte ,/vas not performed. Michael Riccomini ' /,,' / Labo~'atory Director 4440 Grissom St. Suite I00, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1920 Client: ,-~qua Gecscienoes Address: 4440 Grissom St., Suite Cit¥1StatetZIP: Bakersfield, CA 93313 Phone: (805) 836-8100 FA,'(: (805) 836-8800 Attention: P. McCullough Sampled By: Patdck McCullough Analysis Performed: Project Name: Davies Matrix; Scil Analyst: Kim Oailey Date Received: Jan 17, 1996 Date of Analysis: 1-22-96 thru 1-23-96 Date of this Report: Jan 24, 1996 Total Petroleum Hydrocarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrccarb~ns (TRPH) by EPA Method 418.1 Lab Number: 96A36 96A37 96A38 96A39 96A40 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-3-10' C-3-15' C-3-17' C-2-5' C-2.10' Units: rog/Kg rog/Kg rog/Kg rog/Kg rog/Kg TPH as Gasoline: ND ND ND ND' ND MDL: 0.5 0.5 0.5 0.5 0.5 TPH as Diesel: ND ND ND ND ND MDL: 1 1 1 1 1 TRPH: NA NA NA NA NA MDL: MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riccomini Laborator'/Director 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories, Inc. California Department of Health Ser~,'ices Certificate No. ~920 client: Address: C ity/State/ZIP: Phone: FA,'(: Attention: Sampled By: Analysis Performed: .4qua Geosciences 4440 Grisscm St., Suite Bakersfield, CA 93313 (805) 836-8100 (805) 836-8800 P. McCul!ough Patrick McCullough Project Name: Cavies Matrix: Soil Analyst: Klm Oailey Date Received: Jan !7. 1996 Date of Analysis: 1-22-96 ~hru 1-23-96 Date of this Report: Jan 24, 1996 Total Petroleum Hydrocarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 Lab Number: 96A41 96A42 96A43 96A43 96A44 Date Sampled: Jan t6, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-2-15' C-2-17' C-2-20' C-4-5' C4-10' Units: mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg TPH as Gasoline: ND ND ND 0.57 ND MDL: 0.5 0.5 0.5 0.5 0.5 TPH as Diesel: ND ND ND ND ND MDL: 1 1 1 1 1 TRPH: NA NA NA NA NA MDL: MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- anal~,~is for this analyte 'eras not performed. Laborator7 Director 44-40 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1 920 client: Address: City/State/ZIP: Phone: FAX: Attention: Sampled By: Analysis Performed: Aqua Gecsciences 4440 Grissom St. Suite Bakersfield, CA 93313 (805) 836-8100 (805) 836-8800 P. McCullough Patrick McCullough Project Name: Da,,ies Oil Co. Matrix: So(I Analyst: KJm Oailey Date Received: Jan 17, 1996 Date of Analysis: 1-22-96 thru 1-23-96 Date of this Report: Jan 24, 1996 BTEX by purge and trap (EPA Melhcd 5030/8020) Lab Number: 96A41 96A42 96A43 96A44 96A45 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-2-15' C-2-17' C-2-20' C-4-6' C-4-10' Units: mg/Kg mg/Kg mg/Kg mgJKg mgtKg Benzene: ND ND ND ND ND MDL: 0005 0.005 0.005 0.005 0.005 Toluene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Ethyl Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Total Xylenes: ND ND ND 0.018 ND MDL: 0.005 0.005 0.005 0.005 0.005 MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte ,,vas present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Ri-ccomini ' ~/ '" Laboratory Director · !,440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories, [nC. California Department of Health Services Certificate No. 1920 Client: Address: City/State/ZiP: Phone: FAX: Attention: Sampled Analysis Performed: ,\qua Geosciencas 4440 Grissom St.. Suite Bakersfield. CA 93313 (805) 836-8100 (805) 836-8800 P. McCullough Patrick McCullough Project Name: Day,es Matrix: Soil Anal~/st: Kim Oailey Date Received: Jan 17. 1996 Date of Analysis: 1-22-96 thru 1-23-96 Date ot' this Report: Jan 24, 1996 Total Petroleum Hydrocarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 Lab Number: Date Sampled: Sample Oescription: Units: 96A48 Jan 16, 1996 C-4-15' mg/Kg 96A47 96A48 96A49 96A~0 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 C-,4-17.' C-5.-5' C-5-10' C-6.15' mg,'Kg mg/Kg mg/F,~ mgJKg TPH as Gasoline: ND 2.26 ND ND ND i MDL: 0.5 0.5 0.5 0.5 0.5 TPH as Diesel: ND MDL: 1 TRPH: NA MDL: ND ND ND ND 1 1 1 1 NA NA NA NA MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below [he MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riccomini Laboratory Director 4440 Gdssom St. Suite 100, Bakersfield CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories. IrlC. California Department of Health Services Certificate No. 1920 Client: Address: CitytStateiZlP: Phone: FAX: Attention: Sampled By: Analysis Performed: .:q~;a Oecsc:ences '4,.,MO Grisscm St. Suite !C0 Bakersfield, CA 93313 (805) 836-8100 (805) 836-8800 P. McCullough Patrick McCullough Project Name: Ga,i/es Oil Matrix: Sail Analyst: Kim Oaile,./ Date Received: Jan t7, 1996 Date of Analysis: 1-22-96 thru 1-23-96 Date of this Report: Jan 24, 1996 BTEX by purge and trap (EPA Method 5030/8020) Lab Number: 96A48 96A47 96A48 96A49 96A50 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-4-15' C-4-17' C-5-5' C-5-10' C-5-15' Units: mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Toluene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Ethyl Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Total Xylenes: 0.011 ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 MDL: ND: NA: Methcd Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the anaiyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte ,NaS not performed. Michael Riccomini Laboratory Directcr -!440 Grissom St. Suite 100. Bakersfield. CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories. Inc. Calit'ornia Department of Health Sen/ices Certificate No, 1920 Client: -~qua Geosc~ep, ces Address: 4440 Grissom St., Suite CityiStatetZIP: Bakersfield, CA 933~,3 Phone: (805) 836-8100 FAX: (805) 836-8800 Attention: P. McCullough Sampled ~,y; Patrick McCullough Analysis Performed: Project Name: Cay!es Matrix: Scil Analyst: Klm Dailey Date Received: Jan 17. 1996 Date of Analysis: 1-22-96 thru 1-23-96 Date of this Report: Jan 24, f996 Total Petroleum Hydrocarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 Lab Number: 96A51 96A52 96A53 96A54 96A55 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 18, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-6-17' C-~-20' C-6-5' C-6-10' C-6-15' Units: mg/Kg rog/Kg mgtKg mg/Kg mg/Kg TPH as Gasoline: ND ND ND ND ND [ MDL: 0.5 0.5 0.5 0.5 0.5 TPH as Diesel: ND ND ND ND ND MDL: 1 1 1 1 1 TRPH: NA NA NA NA NA MDL: MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and cculd not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riccomini Laboratory Director 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories, .Inc. California Department of Health Services Certificate No. 1920 Client: Address: City/Slate/ZiP: Phone: FAX: Attention: Sampled By: Analysis Performed: Aqua Geosciences 44.40 Grissom St. Suite Bakersfield, CA 93313 (805) 836-8100 (805) 836-8800 P. McCullough Patrick McCullough Project Name: Davies ,Oil Cc. Matrix: Soil Analyst: KJm Oailey Date Received: Jan 17, 1996 Date of Analysis: 1-22-96 thru 1-23-96 Date of this Report: Jan 24. 1996 BTEX by purge and trap (EPA Method 5030/8020) Lab Number: 96A51 96A52 96A53 96A54 96A55 Date Sampled: Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Jan 16, 1996 Sample Description: C-5-17' C-5-20' C-6-S' C-6-10' C-6-15' Units: mg/Kg mg/Kg mg/Kg rog/Kg mg/Kg Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Toluene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Ethyl Benzene: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 Total Xylenes: ND ND ND ND ND MDL: 0.005 0.005 0.005 0.005 0.005 MDL: ND: NAt Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not perfcrmed. Michael Riccomini - ' ~ "' Laborator,t Oirector 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories, [nC. California Department ct' Health Services Certificate No. 1920 Client: Address: City/State]ZIP: Phone: FAX: Attention: Sampled By: Analysis Performed: Aqua Oecsciences Project Name: Davies 4440 Grissom St,, Suite ~CO Matrix: Soil Bakersfield, CA 93313 Analyst: KJm Dailey (805) 836-8100 Date Received: Jan 17, 1996 (805) 836-8800 Date of Analysis: 1-22-96 thru !-23-96 P. McCullougn Date of this Report: Jan 24, 1996 Patrick McCullough Total Petroleum Hydrocarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418. I Lab Number: 96A56 Date Sampled: Jan 16. 1996 Sample Description: C-6-17' Units: mg/Kg TPH as Gasoline: ND MDL: 0.5. TPH as Diesel: ND MDL: 1 TRPH: NA MDL: MDL: ND: NA: Methcd Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was ncr performed. Michael Riccomi'ni ' (,/' " Laboratory Director 44-!,0 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories. Inc. California Department of Health Services Certificate No. 1920 Client: Address: C ity/State/Z1P: Phone: FAX: Attention: Sampled By: Analysis Performed: .Aqua Geosciences 4440 Grissom St. Suite Bakersfield, CA 93313 (805) 836-8100 (805) 836-8800 P. McCullough Patrick McCullough BTEX by purge and trap Project Name: Davies Cil Matrix: Soil Analyst: Kim Dailey Date Received: Jan 17, 1996 Date o¢ Analysis: 1-22-96 thru 1-23-96 Date of this Report: Jan 24, 1996 EPA Method 5030/8020) Lab Number: 96A56 Date Sampled: Jan 16, 1996 Sample Description: C-6-17' Units: rog/Kg Benzene: ND MDL: 0.005 Toluene: ND MDL: 0.005 Ethyl Benzene: ND MDL: 0.005 Total Xylenes: ND MDL: 0.005 MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Nct Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riccomini ~/' - ff '~ Laboratory Director 4440 Gdssom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 APPENDIX C PURGE DATA SHEETS AND WELL DEVELOPMENT DATA 1701 Wc.,stwind Drive, Suite 101 * Bakersfield, California 93301 MPLE ID OR WELL NO.: MW-IA DEPTH TO WATER: 18.05' PROJECT NO.: TOTAL DEPTH OF WELL: 61.50' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 2/12/96 CASING VOLUME: 26 Gallons SAMPLED BY: Patrick McCullou.qh . METHOD OF PURGING: KY PURGE PUMP PURGE CHARACTERISTICS SEC SAMPLE TEMP pH REMARKS (pmhos/ CONTROL i TIME INTAKE RATE CUM. VOL. WELL VOL (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GPM) (GAL) PUMPED 1025 1031 25' 2 10 0.38 68..5 7.48 424 Clear, no odor 1037 28' 2 20 0.7 69.0 7.03 446 Cloudy and yellow, no odor. 1044 28' 1.4 30 1.1 69.2 6.98 461 Clear, no odor. 1050 28' 2 40 1.5 69.3 6.73 461 Clear, no odor. 1055 28' ;2 50 1.9 69.1 6.75 465 Clear, no odor. 1100 '28' 2 60 2.3 69.4 6.76 472 Clear, no odor. ,I 1105 28' 2 70 2.6 69.1 6.73 468 Clear, no odor. 1110 28' 2 80 3.0 69.1 6.63 473 Clear, no odor. 1125 MW-lA Sample pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 3H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL, SOLUTI,O. N/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 18.06 FT. FINAL DEPTH TO WATER 18.18 FT. 3 CASING VOLUMES = 78 GALS. ' ,rES: AquaGeosciences, Inc. Groundwater Scientists · Environmental Consultants 1701 Westwind Drive, Suite 101 · Bakersfield, California 9.3301 WATER QUALITY SAMPLING RECORD AND WELL DEVELOPMENT DATA ~,MPLE ID OR WELL NO.: MW-2 PROJECT NO.: PROJECT NAME: DAVIES OIL COMPANY DATE: 2/12/96 SAMPLED BY: P. McCullough/H. Ra¥~loza DEPTH TO WATER: 19.90' TOTAL DEPTH OF WELL: 24.30' WELL DIAMETER: 2" CASING VOLUME: 0.84 Gallons METHOD OF PURGING: KV Pur,qe Pump INTAKE CUM. VOL. WELL DEPTH (GAL) PUMPED 22' 1 1.1 22' 2 2.2 22' 3 3.3 22' 4 4.4 22' 5 5.5 SEC SAMPLE pH ~mhos/ CONTROL (UNITS) cm) NO. 5.78 610 6.66 611 6.48 610 REMARKS (COLOR, TURBIDITY, ETC.) Cloudy, rusty brown, no odor Cloudy, rusty brown, no odor Clear, no odor Clear, no odor Clear, no odor Sample 6.45 604 6.42 600 MW-2 pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/~MHOS / CM @ 25° C 74 i 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT _18.67 FT: FINAL DEPTH TO WATER __18.67 FT. 3 CASING VOLUMES = __2.52 GALS. OTES: AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD ~ Groundwater Scientists · Environmental Consultants AND WELL DEVELOPMENT DATA 1701 W~.'stwind Drive, Suite 101 ', Bakersfield, California 'q32,01 tMPLE ID OR WELL NO.: MW-3 PROJECT NO.: PROJECT NAME: DAVIES OIL COMPANY DATE: 2/12/96 SAMPLED BY: Patrick McCullough DEPTH TO WATER: 19.77' TOTAL DEPTH OF WELL: Z3.70' WELL DIAMETER: 2" CASING VOLUME: 0.58 Gallons METHOD OF PURGING: KV Purge Pumps CUM. VOL. WELL (GAL), PUMPED 1 1.72 2 3.44 3 5.17 4 6.89 pH (UNITS) SEC SAMPLE REMARKS (pmhos/ CONTROL cra) NO. (COLOR, TURBIDITY, ETC.) 8.34 647 Clear, no odor 7.05 621 Clear, no odor Clear, no odor Clear, no odor 7.03 615 7.03 609 MW-3 Sample pH CALIBRATION / STANDARDIZATION TEMP °C INSTRUMENT READING I SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION INSTRUMENT READING SAMPLED AT _19.80FT. FINAL DEPTH TO WATER _19.80 FT. 3 CASING VOLUMES = _17.4_ GALS. )TES: ~vi.o.m..,a, cl~tC0.~.~.~.,.. WATER SAMPLING A.uaGeosciences, . QUALITY RECORD Ground water Sdentists · AND WELL DEVELOPMENT DATA 1701 Wc~twind Drive, Suite lOl · Bakersfield, California 03301 ,MPLE {D OR WELL NO.: HW-4. DEPTH TO WATER: 19.54' PROJECT NO.: TOTAL DEPTH OF WELL: PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: DATE: 2/12/96 CASING VOLUME: METHOD OF PURGING: SAMPLED BY: Patrick McCullouqh 23.62' SEC SAMPLE REMARKS pH (umhos/ CONTROL INTAKE CUM. VOL. WELL (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GAL) PUMPED Not Sampled pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/./MHOS /Cm @ 25° C 74 TEMP °C INSTRUMENT READING 718 I 1413 SAMPLED AT FT. FINAL DEPTH TO WATER 3TES: Not Sampled j6868 ] 58640 FT. 3 CASING VOLUMES = GALS. _A_quaGeosciences, Inc. WATER QUALITY SAMPLING RECORD ~' Groundwater S~entists · Environmental Consultants AND WELL DEVELOPMENT DATA 1701 Westwind Drive, Suite 101 · Bakersfield, California 93301 ,MPLE ID OR WELL NO.: ' MW-5 DEPTH TO WATER: 17.38' PROJECT NO.: TOTAL DEPTH OF WELL: PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 2/12/96 CASING VOLUME: METHOD OF PURGING: SAMPLED BY: Patrick McGullouqh 23.32' TIME SEC SAMPLE REMARKS pH Cumhos/ CONTROL INTAKE CUM. VOL, WELL (UNITS) em) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GAL) PUMPED Not Sampled pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 pH lO.O[ ] TEMP °C I ' I INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION / CM @ 25° C 141'3 SAMPLED AT FT. Not Sampled ' }TES: FINAL DEPTH TO WATER FT. 3 CASING VOLUMES = GALS. AND WELL DEVELOPMENT DATA 1701 Westwind Drive, Sttite 101 · Bakersfield, California 93301 .MPLE ID OR WELL NO.: MW-~ 'DEPTH TO WATER: 19.88' PROJECT NO.: TOTAL DEPTH OF WELL: PROJECT NAME: DAVIES OIL COMPANY ' WELL DIAMETER: z" DATE: z/1 z/96 CASING VOLUME: METHOD OF PURGING: SAMPLED BY: Patrick McCullouqh 23.63' SEC SAMPLE REMARKS pH 0~mhos/ CONTROL INTAKE CUM. VOL. WELL (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GAL) PUMPED Not Sampled pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE KCL SOLUTION pMHOS / CM @ 25° C CALIBRATION / STANDARDIZATION 74 718 1413 ! 6868 58640 TEMP°C INSTRUMENT READING SAMPLED AT FT. JTES: Not Sampled FINAL DEPTH TO WATER FT. 3 CASING VOLUMES GALS. AquaGeosciences Inc. WATER QUALITY SAMPLING RECORD Groundw,~ter Sdentists · Envi~onmenta[Consultants AND WELL DEVELOPMENT DATA 1701 Wcstwind Drive, Suite 101 · Bakersfield, California 93301 ,vlPLE ID OR WELL NO.' MW-lO DEPTH TO WATER: 17.88' PROJECT NO.' TOTAL DEPTH OF WELL: 27.0 PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 2" DATE: 2/12/96 CASING VOLUME: SAMPLED BY: , Patrick McCullo%lh METHOD OF PURGING: PURGE CHARACTERISTICS SEC SAMPLE TEMP pH REMARKS (pmhos/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOl (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GPM) (GAL) PUMPED Not Sampled pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 oH 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT FT. FINAL DEPTH TO WATER FT. 3 CASING VOLUMES = GALS. Not Sampled ,TES: AND WELL DEVELOPMENT DATA 1701 Westwind Drive, Suite 101 · Bakersfield, Cali/ornia 03301 .MPLE ID OR WELL NO.: Mw-1 lA DEPTH TO WATER: 17.80' PROJECT NO.: TOTAL DEPTH OF WELL: 68.84' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 2/12/96 CASING VOLUME: SAMPLED BY: P. McCullough/H. Ray.qoza METHOD OF PURGING: KY PURGE PUMP PURGE CHARACTERIST C$ SEC SAMPLE TEMP pH REMARKS C/Jmh os/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOL (°C) (UNITS) CT) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GPM) (GAL) PUMPED 1227 20' 2 10 0.32 68.7 7.16 283 Clear, no odor 1232 22' 2 20 0.65 68.8 7.20 276 Clear, no odor 1237 22' 2 30 0.98 68.8 7.20 275 Clear, no odor 1242 22' 2 40 1.3 68.7 7.19 276 Cleari no odor 1247 22' 2 50 1.6 69.0 7.10 278 Clear, no odor 1251 23' 2 60 1.9 69.4 7.38 283 Clear, no odor 1256 23' 2 70 2.2 69.4 7.43 287 Clear, no odor 1300 23' 2 80 2.6 69.3 7.52 285 Clear, no odor 1304 23' 2 90 2.9 69.0 7.50 287 Clear, no odor 1309 23' 2 95 '3.1 68.9 7.52 287 Clear, no odor pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION aH 4.01 pH 7.0 ~H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLEDAT 17.80 FT. FINAL DEPTH TO WATER 17.84 FT. 3CASINGVOLUMES= 91.5 GALS. .)TES: ^~ r~ :~qua,~eosoences,Inc. WATER QUALITY SAMPLING RECORD ~' Groundwater.~.ientists · Environmental Consultants AND WELL DEVELOPMENT DATA 1701 Westw~nd Drive, Suite 101 · Bakersfield, California 93301 .vlPLE ID OR WELL NO.: MW-12A DEPTH TO WATER: 17.83' PROJECT NO.: TOTAL DEPTH OF WELL: 63.36' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 6" DATE: 2/12/96 CASING VOLUME: 66.8' SAMPLED BY: P. McCullou~h/H. Ra¥~loza METHOD OF PURGING: KV Purge pumps Pt. RGE CHAI~Aq:TERISTIq:~ SEC SAMPLE TEMP pH REMARKS (#mhos/ CONTROL I TIME INTAKE RATE CUM. VOL. WELL VOL (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GPM) (GAL) PUMPED Clear, very slight petro odor ' 1335 25' 2.5 25 0.37 70.4 7.30 250 1344 26' 2.5 50 0.74 70.5 7.12 382 Clear, very slight petro odor 1354 26' 2.5 75 1.12 69.6 6.91 246 Clear, very slight petro odor 1405 26' 2.5 100 1.49 70.5 6.87 376 Clear, very slight petro odor 1412 26' 3.5 125 1.87 69.6 7.58 353 Clear, distinct petro odor 1420 26' 3.1 150 2.24 70.4 6.95 312 Clear, distinct petro odor 1430 26' 2.5 175 2.61 70.2 6.95 299 Clear, distinct petro odor 1440 26' 2.5 200 3.0 70.3 6.92 329 Clear, distinct petro odor pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 IpH 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION gMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT _1 7.83_ FT. FINAL OEPTH TO'WATER 18.80 FT. 3 CASING VOLUMES -- 200 GALS. .)TES: AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD ~' Groundwater Scientksts · Environmental Consultants AND WELL DEVELOPMENT DATA 1701 Westwind Drive, Suite 101 ,, Bakersfield, California 93301 ~MPLE ID OR WELL NO.' Mw-13 DEPTH TO WATER: 18.91' PROJECT NO.: TOTAL DEPTH OF WELL: 48' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 2/12/96 CASING VOLUME: METHOD OF PURGING: SAMPLED BY: Patrick McCullouqh SEC SAMPLE pH 0Jmhos/ CONTROL INTAKE CUM. VOL.~ WELL VOl (UNITS) DEPTH (GAL) PUMPED cm) NO. REMARKS (COLOR, TURBIDITY, ETC.) Not Sampled pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 pH 10.0 I TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION INSTRUMENT READING SAMPLED AT FT. FINAL DEPTH TO WATER FT. 3 CASING VOLUMES = Not Sampled .OTES: GALS. AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD GtoundwaterScientists ,. EnvironmentalC0nsultants AND WELL DEVELOPMENT DATA 1701 Wc~t~vind Drive, Suite I01 · Bakersfield, California 03301 AMPLE ID OR WELL NO.: MW-14 A PROJECT NO.: PROJECT NAME: DAVIES OIL COMPANY DATE: 2/12/96 SAMPLED BY: P. McCullouqh/H. Ray,qoza DEPTH TO WATER: ~8.21' TOTAL DEPTH OF WELL: 62.5' WELL DIAMETER: 4" CASING VOLUME: 26.50' METHOD OF PURGING: KV Purge Pump DEPTH  _ 25'  25'  25'  25' ,1603 25' 25' 25' 25' CUM. VOL. WELL (GAL) PUMPED pH (UNITS) SEC SAI~PLE REMARKS (#mhos/ CONTROL cra) NO. (COLOR, TURBIDITY, ETC.) 10 .37 6.92 568 20 0.75 6.51 475 30 1.13 6.53 473 40 1.50 6.55 463 50 1.88 6.44 460 60 2.26 6.51 460 70 2.64 6.47 458 80 3.01 6.48 458 Clear, moderate petro odor Clear, moderate petro odor Clear, moderate petro odor Clear, moderate petro odor Clear, moderate petro odor Clear, moderate petro odor Clear, moderate petro odor Clear, moderate petro odor pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCLSOLUTION/JMHOS/CM@25°C 74 I 718 1413 TEMP°C INSTRUMENT READING SAMPLED AT 1 8.21 FT. FINAL DEPTH TO WATER 18.21 I6868 I 586401 FT. 3 CASING VOLUMES: NOTES: 79.5 GALS. An i Igc WATER SAMPLING . ua. eosc.ences, . QUALITY RECORD '" Groundwater Scientksts * Environmental Consultants AND WELL DEVELOPMENT DATA 1701 Westwind Drive, Suite 10l · Bakersfield, Cali/omia 93301 ~,MPLE ID OR WELL NO.: MW] 5 DEPTH TO WATER: 18.24' PROJECT NO.: TOTAL DEPTH OF WELL: PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 2/12/96 CASING VOLUME: METHOD OF PURGING: SAMPLED BY: Patrick McCullouqh 48.50' SEC SAMPLE REMARKS pH ~mhos/ CONTROL INTAKE CUM. MOt (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GAL) PUMPED Not Sampled pH CALIBRATION / STANDARDIZATION TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION ~IMHOS / CM @ 25° C 74 71 8 1413 TEMP °C INSTRUMENT READING SAMPLED AT FT. FINAL DEPTH TO WATER Not Sampled iOTES: FT. 3 CASING VOLUMES = GALS. AND WELL DEVELOPMENT DATA 1701 Westwind Drive, Suite 101 · Bakersfield, California 93301 ~,MPLE ID OR WELL NO.: MW-16 DEPTH TO WATER: 16.47' PROJECT NO.: TOTAL DEPTH OF WELL: 47.5' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 2/] 2/96 CASING VOLUME: METHOD OF PURGING: SAMPLED BY: Patrick McCullouqh ph SEC SAMPLE REMARKS (#mhos/ CONTROL INTAKE CUM. VOL. WELL VOl (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GAL) PUMPED Not Sampled pH CALIBRATION / STANDARDIZATION TEMP °C INSTRU,MENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION TEMP °C I I I INSTRUMENT READING . SAMPLED AT FT. FINAL DEPTH TO WATER FT. 3 CASING VOLUMES = GALS. I .~OTES: Not Sampled APPENDIX D LABORATORY REPORTS AND CHAIN OF CUSTODY GROUNDWATER SAMPLES I IAI-CYON"It,~J ~,~1 bor~it orirs 4~] 4440 Grissom St. Suite 100, Bakersfield, CA 93313 (805) 836-8100 CHAIN OF CUSTODY AND ANALYSIS REQUEST CLIENT NAME -'-~/~ ~;-c'")3t '¢~,'TCeJ. .~T../7( , ANALYSES REQUESTED REMARt< AOOR~SS PROJEC~ MANAGER /~. ~,(W[/aW~ FAX ~ ~, SAMPLE DATE/TIME SAMPLE DESC~PTION, IDENTIFICATION ~ SAMPLED Matrix, container, et~... ~U~SUISHED BY ~Dale & time RELINQUISHED BY ~--5-;"[;'-~ .... ~IVEO BY, Y~7*] Z~¢ ~ 2-/~'?~ RECEIVED BY, SIONA~ORE AND PRINIED NAME ~/~ ~ ~///? 0~2~ 610NATURE AND PRINTED NAME Halcyon Laboratories. Inc. California Department of Health Services Certificate No. 1920 Client: Address: City/StatetZ]P: Phone: FAX: Attention: Sampled By: Analysis Performed: .Aqua Oecsciences !440 Gdssom ,St. Suite I C,0 Bakersfield, CA 93313 (805} 836-8100 (8O5) 836-88CO Patrick McCutlough Patrick McCullough Project Name: Davies Oil Co. Matrix: Aqueous Analyst: Kim Oailey Date Received: Feb !3. !996 Date of Analysis: Feb ~3, 1996 Date of this Report: Feb 18, 1996 8TEX by purge and trap (E PA Method 5030/8020) Lab Number: 96A64 96A65 96A66 96A67 96A68 Date Sampled: Feb 12, 1996 Feb 12, 19c-~ Feb 12, 1996 Feb 12, 19S6 Feb 12, 1996 Sample Description: MW-3 MW-1-A MW-11-A MW-12-A MW-2 Units: ug/L ug/L ug/L ug~L ug/L Benzene: ND MDL: 0.5 Toluene: 5.,9 MDL: 0.5 Ethyl Benzene: ND MDL: 0,5 Total Xylenes: 1.S MDL: 0.5 TPH as Gasoline: 'ND MDL: 50.. ND ND ND ND 0,5 0.5 0.5 0.5 4.3 2.3 1.3 0.$ 0.5 0.5 0.5 0.5 ND ND ND ND 0.5 0.5 0.5 0.5 1.4 1.3 1.2 ND 0.5 0.5 0.5 0.5 ND ND 1700 82 50 50 50 50 MDL: Me{hod Detection Limit- the least amount of analyte that can be detected and reported. ND: Not Detected- the analyte was present below the MDL and could not be detected and reported. NA: Not Analyzed- analysis for this analyte was not performed. 'Michael Ricc0mini- Laboratory Director '/' 4440 Gfissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8600 Halcyon Laboratories, Inc. California Depallment of Health Services Certificate No. 1920 Client: Address: City/StatelZIP: Phone: FAX: Attention: Sampled By: Analysis Performed: Aqua Geosciences 4440 Grissom St. Suite Bakersfield, CA 93313 (805) 836-8100 (8O5) 836-8800 Patrick McCullough Patrick McCullough Proiect Name: Matrix: Analyst: Date Received: Date of Analysis: Date of this Report: BTEX by purge and trap (EPA Method 50~--~/8020) C, avies Od Co. Aquecus Kim Daitey FeD 13, ~996 Feb 13, ~, 996 Feb ~ 8, !996 Lab Number: 96A69 Date Sampled: Feb 12, 1996 Sample Description: MW-14-A Units: ug/L Benzene: ND MDL: 0.5 Toluene: 8.7 MDL: 0.5 Ethyl Benzene: 1,3 MDL: 0,5 Total Xylenes: 2000 MDL: 25 TPH as Gasoline: 21000: MDL:. 2500 MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the anaiyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael'Ric~0minT' -' ,,: ? j Laboratory Director 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 APPENDIX E HISTORICAL WATER ELEVATIONS TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA RW-1 1 1/2/88 410.34 23.91 385.99 0.25 1/13/89 20.82 389.12 0.2 3/1 3/89 21.15 388.93 0.01 7/2/89 27.69 382.65 7/31/89 28.55 381.79 8/24/89 29.64 380.7 9/7/89 29.1 381.24 1 0/25/89 30.22 380.12 11/8/89 30.71 379.63 1 2/8/89 30.5 379.84 1/4/90 31.55 378.79 2/7/90 31.65 378.69 2/1 9/90 30.31 380.03 5/31/90 33.1 377.24 OCCR 7/25/90 34.5 375.84 ODCR 8/1 6/90 35,1 375.24 ODOR 1/11/91 DRY CRY 4/5/91 DRY DRY 6/1 5/91 CRY CRY 1 2/9/93 26,09 384.25 NO ODOR 3/30/94 25.80 384.54 NOODOR 6/3/94 25,96 384,38 NOODOR 8/23/94 27.49 382.85 12/5/94 Not Sampled Not Sampled 3/3/95 Not Sampled Not Sampled 6/1/95 Not Sampled Not Sampled 8/16/95 ..... Npt Sampled Not Sampled 11/9/95 Not Sampled Not Sampled 2/12/96 Not Sampled Not Sampled TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-1 7/11./86 409.33 24.18 14.86 394.47 4" free prod. 5/8/87 18.23 391.1 0.5' 10/22/87 19.72 389.61 0.06' 12/3/87 20.66 388.67 0.8' 3/4/88 19.09 390.24 0.25' 5/2/88 21.24 388.09 0.2' 11/2/88 22.83 386.5 Strong Odor 1/13/89 19.93 389.38 3/14/89 20.22 389.11 6~26~89 CRY CRY 1 0/25/89 DRY CRY 1/4/90 Ct::{Y CRY 3/6/9O CRY CRY 1/11/91 CRY DRY 4/5/91 CRY CRY 6/15/91 DRY DRY 9/20/93 CRY CRY STRONG ODOR 1 2/9/93 ~ DRY 3/30/94 DRY CRY 6/2/94 CI::{Y DRY 8/23/94 DRY CRY 12/5/94 DRY DRY 3/3/95 ~ CRY 6/5/95 20.31 389.02 Oily film 8/1 6/95 19.35 389.98 11/9/95 ..... 18.74 390.59 2/12/96 Not Sam.p. led Not Sampled TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-lA 9/4/92 408.10 61.5 34.98 9/20/93 25.28 1 2/9/93 23.73 3/30/94 23.47 6/2/94 23.64 8/23/94 25.13 12/5/94 27.08 3/3/95 23.88 6/5/95 19.72 8/1 6/95 17.66 11/9/95 17.02 2/1 2/96 18.05 373.12 382.82 384.37 384.63 384.46 382.97 381.02 384.22 388.38 390.44 391.08 390.05 No Odor No Odor TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-2 7/11/86 409.31 24.3 1 2/19/86 5/8/87 1 0/22/87 1 2/3/87 3/5/88 5/2/88 1 1/2/88 1/13/89 3/13/89 6/26/89 1 0/5/89 3/6/90 1/11/91 4/5/91 6/15/91 9/20/93 12/9/93 4/1/94 6/2/94 8/23/94 1 2/5/9'4 3/3/95 6/5/95 8/16/95 11/9/95 2/12/96 15.02 394.29 17.87 391,44 NA NA 19.35 389.96 20.43 388.88 19,07 39O.24 20,7 388.61 22.79 382.56 2O.04 389.27 20.45 388.86 20.53 388.78 18.41 390,9O 17,68 391.63 19.9 389.41 NO PRODUCT NO ODOR SUGHTODOR SLIGHT ODOR TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-3 7/11/86 410.22 23.7 15.37 394.85 NO PRODUCT 5/8/87 18.34 391.88 1 0/22/87 20 390.22 SUGHT ODOR 1 2/3/87 20.77 389.45 SUGHT ODOR 3/5/88 19,42 390.8 DIESEL ODOR 5/2/88 21.1 389.12 SLIGHT ODOR 1 1/2/88 22.86 387.36 DIESELODOR 1/13/89 20.2 390.02 3/13/89 20.77 389.45 1 0/5/89 CRY CRY 11/9/89 CRY CRY 1/4/90 CRY CRY 2/7/90 DRY DRY 3~6~90 CRY DRY 1/11/91 DRY DRY 4/5/91 CRY DRY 6/15/91 DRY DRY 9/20/93 DRY DRY 1 2/9/93 DRY DRY 3/30/94 DRY CRY 6/2/94 DRY CRY 8/23/94 CRY CRY 1 2/5/94 DRY DRY 3/3/95 CRY CRY 6/5/95 21,22 389.00 8/1 5/95 ..... 19.26 390.96 11/9/95 18.71 391.51 2/1 2/96 19.77 390,45 TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-4 7/11/86 409.72 15.06 394.66 5/8/87 17.87 391.85 1 0/22/87 18.46 391.26 12/3/87 20.41 389,31 3/5/88 19.03 390.69 5/2/88 20.58 389.14 11/2/88 22,5 389.2 1/13/89 20,08 389.64 3/1 3/89 20.3 389.42 6/26/89 DRY DRY 10/5/89 CRY CRY I 1/9/89 CRY DRY 1/4/90 CRY' DRY 2/7/90 DRY DRY 3/6/90 CRY CRY 1/11/91 ERY. CRY 4/5/91 CRY CRY 6/15/91 CRY CRY 9/20/93 DRY DRY i2/9/93 CRY CRY 3/30/94 DRY DRY 6/2/94 CRY CRY 8/23/94 CRY DRY 1 2/5/94 DRY CRY 3/3/95 CRY DRY 6/5/95 ..... CRY CRY 8/1 5/95 19.02 390.70 11/8/95 18.50 391,22 2/1 2/96 19.54 390.18 TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-5 407,62 23,3 3/1 3/89 18,32 6/26/89 21,79 1 0/.25/89 DRY 9/21/93 DRY 12/9/93 DRY 4/1/94 DRY 6/2/94 CRY 8/23/94 DRY 1 2/5/94 DRY 3/3/95 22,28 6/1/95 19,48 8/1 6/95 16.49 11/8/95 15,83 2/12/96 17,38 389.3 385,83 CRY DRY 385,34 388,14 391,13 391.79 390.24 TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-8 5/8/87 409.68 24.6 1 8 391.68 10/22/87 19.6 390.08 12/3/87 20.6 389.88 3/4/8 8 19.'27 390.41 5/2/88 DRY CRY 11/2/88 CRY DRY 1/13/89 CRY CRY 3/13/89 20.7 388.98 6/26/89 CRY CRY 10/5/89 CRY DRY 11/9/89 DRY DRY 1/4/90 DRY CRY 2/7/90 ERY DRY 3/6/90 DRY DRY 1/11/91 CRY CRY 4/5/91 CRY CRY 6/15/91 DRY DRY 9/20/93 ERY DRY 1 2/9/93 CRY CRY 3/30/94 DRY DRY 6/2/94 DRY DRY 8/23/94 CRY CRY 12/5/94 ERY CRY 3/3/95 CRY CRY 6/1/95 CRY CRY 8/15/95 ..... 19.46 390.22 1 1/8/95 18.63 391.05 2/1 2/96 19.88 389.80 TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-9 5/8/87 1 0/22/87 1 2/3/87 3/4/88 5/2/88 11/2/88 1/13/89 3/1 3/89 6/26/89 10/5/89 11/9/89 1/4/90 2/7/90 3/6/90 1/11/91 4/5/91 6/15/91 12/9/93 3/30/94 6/2/94 8/23/94 12/5/94 3/3/95 6/1/95 8/15/95 11/8/95 - 2/12/96 406.60 15.37 391.23 17.38 389.22 18,12 388.48 16.7 389.9 18,26 388.34 17,87 388.72 18.2 388.4 Can't locate Can't locate Can't locate Can't locate Can't locate Can't locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate Can't Locate '.TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-10 408,12 27 3/5/88 5/2/88 11/2/88 1/13/89 3/13/89 6/26/89 7/27/89 1 0/5/89 1/4/90 2/7/90 3/6/90 1/11/91 4/5/91 6/1 5/91 9/21/93 12/9/93 3/30/94 6/2/94 8/23/94 1 2/5/94 3/3/95 6/5/95 8/15/95- 11/9/95 2/1 2/96 .... 17,52 390,6 19,28 389,04 21 387,12 18,36 389,76 18.82 389,3 22,52 385,6 23,2 384,92 24,53 383,59 26,42 381,7 27.09 381,03 24,72 383,4 23,31 384,81 23,14 384,98 23,18 384.94 24,59 383,53 23,46 384,66 19,34 388,78 17,40 390,72 18,82 389,30 17,88 390,24 TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA 3/5/88 409.43 26.58 19.23 390.2 5/2/08 20.78 388.65 11/2/88 23.57 385.56 1/13/89 20.62 388.81 3/13/89 20.63 388.8 6/26/89 24.37 385.06 7/27/89 25.95 384.24 1 0/5/89 CRY CRY 1/4/90 DRY DRY 2/7/9O DRY CRY 3/6/90 CRY CRY 1/11/91 DRY DRY 4/5/91 DRY DRY 6/15/91 DRY CRY 9/20/93 CRY DRY 1 2/9/93 25,55 383,88 3/30/94 ' 25.19 384.24 6/2/94 25.42 384.01 8/23/94 26.96 382.47 12/5/94 DRY DRY 3/3/95 24.64 384.79 6/5/95 20.21 389.22 8/1 6/95 18.22 Not Sampled 11/9/95 17,57 391.86 MW-11 STRONG ODOR NO PRODUCT I 0.75' free proc 0.5' 0.3' 0.01' 1.02' STRONG ODOR STRONG ODOR STRONG ODOR STRONG ODOR STROI~ ODOR STRONG ODOR STRONG ODOR 2/12/96 . .. Not sampled Not Sampled TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-11A *407.58 MW-12 408.67 27.3 9/4/92 1 2/9/93 3/30/94 6/2/94 8/23/94 1 2/5/94 3/3/95 6/5/95 8/1 6/95 11/9/95 2/12/96 3/5/88 5/2/88 11/2/88 1/13/89 3/13/89 6/26/89 7/27/89 1 0/5/89 1/4/90 2/7/90 3/6/90 1/11/91 4/5/91 6/15/91 9/21/93 · 1 2/9/93 4/1/94 6/2/94 8/23/94 1 2/5/94 3/3/95 6/5/95 8/1 6/95 11/9/95 2/12/96 34.8 372.78 Not sampled Not Sampled 23.39 384.19 23.58 384.00 25.O7 383.51 27,38 380.20 23.88 383.70 19.25 388,33 17.50 390.08 16.80 390.78 17.80 389.78 18.62 390.05 20.16 388.51 22.86 385.81 19.81 388.86 20,02 388,65 24,54 384.77 25.39 384.05 26.6 383,08 26.83 381.84 25.13 383.54 24.68 383.99 24.91 383.76 26.71 381.96 25.54 383.13 21.13 387,54 18.96 Not Sampled 18,28 390,39 NotSampled Not Sampled STRONG ODOR SUGHT ODOR 0.5' free prod 0.2' 0.1' 0.94' 1.02' 0.35' STRONG ODOR ST'ROf~ ODOR STRONG ODOR STRONG ODOR I STRONG ODOR TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-12A 3/3/95 unknown 63,36 24,12 unknown 6/1/95 19,74 unknown 8/1 6/95 17,61 unknown 1 1/9/95 16,86 unknown 2/1 2/96 17,83 unknown MW-13 1/1 0/91 409,91 48 NA NA 4/5/91 DRY [3:fY' 6/15/91 CRY DRY 9/4/92 40,94 368.97 9/20/93 29.21 380,7 1 2/9/93 26,71 380.2 3/30/94 25,72 384,19 6/2/94 25,84 384,07 8/23/94 32,09 377.82 12/5/94 29,20 380,71 il 3/3/95 27,10 382.81 6/5/95 22.03 387,88 8/1 5/95 19,46 390,45 1 1/8/95 18,23 391,68 2/1 2/96 18,91 391,00 PETROL ODOR MW-14 1/10/91 408.63 NA 4/5/91 CRY 6/15/91 CRY 12/9/93 --' Not Sam 3/30/94 ..... Not Sam 6/2/94 Not Sam 8/23/94 Not Sam 12/5/94 Not Sam 3/3/95 Not Sam 6/1/95 Not Sam 8/15/95 Not Sam 11/8/95 Not Sam 2/1 2/96 Not Sam NA DRY DRY 31ed Not Sampled 31ed Not Sampled 31ed Not Sampled ~led Not Sampled 31ed Not Sampled 31ed Not Sampled 31ed .Not Sampled 31ed Not Sampled ~led Not Sampled 31ed Not Sampled TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID L. EVEL DATA 9/4/92 406,79 62,5 41,25 365,54 9/20/93 28,6 378,19 12/9/93 25,84 379.83 3/29/94 24.64 382,15 6/2694 24,96 381,83 8/23/94 29,60 377,19 1 2/5/94 28,28 378,51 3/3/95 26,77 380,02 6/5/95 21,43 385,36 8/1 5/95 18,86 387,93 11/8/95 17,62 389,17 2/1 2/96 18,21 388.58 MW-14A NO ODOR MW-15 1/1 0/91 409,78 48,5 NA NA 4/5/91 ~ DRY 6/15/91 Ci:W' CRY 9/4/92 40,15 369,63 9/20/93 27,65 382,18 12/9/93 25,32 381,47 3/29/94 24,43 385,35 6/2/94 22.78 387,00 8/23/94 30,51 379,27 12/5/94 28,36 381,42 3/3/95 26,49 383,29 6/5/95 .... 21.30 388,48 8/1 5/95 ...... 18,92 390,86 11/8/95 17,94 391,84 2/1 2/96 18,24 391,54 NOODOR TABLE 4 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-16 9/4/92 410,52 32,28 378,24 9/21/93 23,38 387.14 12/9/93 22,25 385,25 3/30/94 22,18 388,34 6/2/94 22,2 388,32 8/23/94 26,28 384,24 1 2/5/94 25,72 384,8 NO ODOR 3/3/95 21,46 .389,06 6/5/95 17,72 392,8 8/1 5/95 15,84 394,68 11/8/95 15,32 395,20 2/12/96 16,47 394,05 APPENDIX F HI STORICAL GROUNDWATER ANALYSE S HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA RW-1 1 2/9/93 ND 1 ND ND ND ND 3/30/94 ND 1 ND 1 ND ND 6/3/94 1 3 ND 15 1700 NA 8/23/94 ND ND ND 15 ND NA 12/5/94 NS NS NS NS NS NS 3/3/95 NS NS NS NS NS NS 6/1/95 NS NS NS NS NS NS 8/16/95 NS NS NS NS NS NS 11/8/95 NS NS NS NS NS NS 2/12/96 NS NS · NS NS NS NS MW-1 5/8~87 FLH FLH FLH FLH FLH FLH 10/22/87 FLH FLH FLH FLH FLH FI..H 3/4/88 FU-I FLH FU-I FU-I FLH FLH 3/14/89 FU-I FLH FLH FLH FLH FU-t 3/1/90 DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL 1 / 1 1/91 DRYWELL DRY WELL DRYWELL DRY WELL DRYWELL DRY WELL 4/5/91 DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL G / 15 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 9/20/93 DRY WELL DRY WELL · DRY WELL DRY WELL DRY WELL DRY WELL 12/9/93 DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/30/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 6/2/94 DRYWELL DRYWELL DRY WELL DRYWELL DRYWELL DRYWELL 8 / 23 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/5/94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3 / 3 / 95 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/1/95 ND ND ND ND 980 NA 8/16/95 ND ND ND ND ND NA 11/8/95 NS NS NS NS NS NS ' 2/12/96 NS NS NS NS NS NS MW-lA 9/15/92 12 120 NA 120 NA NA 9/20/93 ND 7 1 8 1300 ND 12/9/93 ND 4 ND ND ND ND 3/30/94 ND 1 ND 2 ND ND 6/2/94 ND ND ND 1 200 ND 8/23/94 ND 1 ND 3 ND NA 12/5/94 ND ND ND 1.2 ND ND 3/3/95 1.7 1 0.9 5.2 ND ND 6/1/95 ND ND ND 180 5220 NA 8/16/95 ND ND ND I~) ND NA 11/8/95 ND ND ND ND ND NA 2/12/96 ND 4.3 ND 1.4 ND NA i i~ FLH = Floatlncj Liquid Hydrocarbons NS = Not Sampled NA = Not Anal~,zed ! ND = Below the indicated detection limit as labeled In the analytical Labora or,/, reports, I TABLE 5 I HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-2 7/11/86 400 310 I~) 550 11000 NA 12/19/86 9 120 ND 330 930 NA 5/8/87 89 <0,5 <0,5 89 4100 < 1 10/22/87 5 22 <0.5 12 I~) 13000 3/4/88 13 2 5 39 1300 3/14/89 5 20 <10 20 4000 NDX[] 10/5/89 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3 / 1 / 90 DRY WEll DRY WEll DRY WELL DRY WELL DRY WEll DRY WELL 1 / 11/91 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 4/5/91 DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL DRYWEll ' 6/15/91 DRY WELL DRY wEll DRYWELL DRYWELL DRY WELL DRYWELL 9 / 20 / 93 DRY WELL DRY WEll DRY WELL DRY WEll DRY WELL DRY WEll 12/9/93 DRY WELL DRY WELL DRYWELL DRY wEll DRY WELL DRY WELL 4/1/94 DRY WELL DRYWEll DRY WEll DRYWELL DRY WELL DRY WELL 6/2/94 DRYWELL DRYWEll DRYWELL DRYWELL DRYWEll DRYWELL 8/23/94 DRYWELL DRYWELL DRYWELL DRYWEll DRYWEll DRYWEll 12 / 5 / 94 DRY WEll DRY WEll DRY WEll DRY well DRY WELL DRY well 3 / 3 / 95 DRY WEll DRY WEll DRY WELL DRY WELL DRY WELL DRY WEll 6/5/95 g 10 3180 ND 5140 33040 NA 8/16/95 I~D I~D I~D 23 107* NA 11/8/95 ND ND ND ND ND NA 2/12/96 ND 0.6 ND ND 82 NA MW-3 7/11/86 43 110 NA 170 6100 ND 5/8/87 0.9 <0.5 <0.5 <0.5 354 6.2 10/22/87 <1 3 1 1 12000 ND 3/4/88 <0.1 <1 <1 <1 ND 29000 3/14/89 <0.2 <2 <2 <2 600 ND 10/5/89 DRY WELL DRY WELL DRY WEll DRY well DRY WELL DRY WELL 3/1/90 DRY WELL DRY WELL DRY WELL DRY WEll DRY well DRY WEll 1 / 11/91 DRYWEll DRYWELL DRY WELL DRY WEll DRY WELL DRYWEll 4/5/91 DRY WELL DRY WEL.L DRY WEll DRY WEll DRY WELL DRY WELL 6/15/91 DRY WELL DRY WEll DRY WELL DRYWELL DRY WEll DRY WEll 9/20/93 DRYWELL DRYWELL DRYWELL DRYWELL DRYWEll DRYWELL 12/9/93 DRY WELL DRY WEll DRYWELL DRY WELL DRY WEll DRY WEM. 3/30/94 DRY VVELL DRYWELL DRYWELL DRYWELL DRY WELL DRYWELL 6 / 2 / 94 DRY-WELL DRY WELL DRY WELL DRY WEll DRY WEll DRY WELL 8 / 23 / 94 DRY WEll DRY WEll DRY WELL DRY WEll DRY WELL DRY WEll 12/5/94 DRY WELL DRY WEll DRY WELL DRY WEll DRY WEll DRY WEll 3/3/95 DRYWEll DRYWEll DRYWELL DRYWEll DRYWEll DRYWELL 6/5/95 ND 800 ND 1450 1280 NA 8/16/95 ND ND ND ' ND ND NA 11/8/95 ND ND ND ND ND NA 2/12/96 ND 5.9 ND 1.6 ND NA :::!!i!ii!!:i i:i::i:!:!::!ii!!i!!!!!!!!i~!!!ii!!!:!!i!!!i!!!iiii!!!!!!!!!!!!!!!!!!!!!!!!!i!i!i!i::::::::~::::::::::::::: i ::::::::::::::::::::::::::: :::::::::::::::::::::::::::::::::::: ::: :,:: ;~ :::::::::::::::::::::::::::::::::::::::::::::::::::::: I I FLH = Floatln~ Liquid Hydrocarbons NS = Not Sampled NA = Not Analyzed I ND = Below the indicated detection limit as labeled in the anat~jtJcal Labora 3r¥ reports. I TABLE 5 HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-4 7/11/86 ND ND NA ND I~D NA 5/8/87 1.8 7.6 <0.5 5.2 22 <1 10/22/87 0.1 <1 <1 <1 <50 3/4/88 <0.1 <1 <1 <1 <50 ND 3/14/89 <0.2 <2 <2 <2 <50 ND 10/5/89 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3 / 1 / 90 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 1 / 11/91 DRYWELL DRY WELL DRYWELL DRYWELL DRYWELL DRYWELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/t 5/91 DRY WELL DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL 9/20/93 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 12/9/93 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3 / 30 / g 4 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/2/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 8/23/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 12/5/94 DRY WELL DRY WELL DRYWELL DRY WELL DRYWELL DRY WELL 3 ! 3 / 95 DRY WELL DRY WE. LL DRY WELL DRY WELL DRY WELL DRY WELL 6/1/95 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 8/15/95 ND ND ND ND ND NA 11/8/95 ND ND ND 8 ND NA 2/12/96 NS NS NS NS N~ ' NS MW-5 9/20/93 DRY WELL DRY WELL DRYWELL DRYWELL DRY WELL DRYWELL 12/9/93 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 4 / 1 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/2/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 8/23/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 12/5/94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 ND ND ND ND ND 6/1/95 ND ND ND ND ND ND 8/16/95 ND ND ND ~ ND NA 11/8/95 I~) ND ND I~D ND NA 2/12/96 NS NS NS NS NS NS FLH = Floatlncj Liquid H)/drocarbons NS = Not Sampled !NA = Not Analyzed I ND = Below the indicated detection limit as labeled in the anal},tJcal Labora off reports. HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-8 5/8/87 <0,5 <0.5 <0.5 <0.5 <0.5 <0.5 10/22/87 <0.1 <0,1 <0.1 <0,1 <0.1 <0.1 3/4/88 <0,1 <0.1 <0,1 <0.1 <0.1 <0,1 3/14/89 <0.2 <0.2 <0,2 <0,2 <0,2 <0.2 10/5/89 DRY WELL DRY WELL DRY WELL DRYWEI 1 DRY WELL DRY WELL 3/1/90 DRYWELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 1 / 11 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6 / 15 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 9/20/93 DRYWELL DRY WELL DRYWELL DRYWELL DRYWELL DRYWELL 12/9/93 DRYWELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 3/30/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 6/2/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 8/23/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 12~5/94 DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 DRYWELL DRYWEL DRYWELL DRYWELL DRYWELL DRYWELL 6/1/95 DRY WELL DRY WEL DRY WELL DRY WELL DRY WELL DRY WELL 8/15/95 I 1/8/95 ND ND 2/12/96 NS NS NS NS NS . NS MW-9 5/8/87 1155 3810 1740 15380 33400 <1 10/22/87 10 1600 2200 37000 170000 ND 3/4188 40 1100 3600 28000 70000 ND 3/14/89 31 120 2200 11000 56000 ND 10/5/89 DRY WELL DRYWELL DRY WELL DRYWELL DRY WELL DRY WELL 3/1/90 DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 1 / 11/91 DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 4/5/91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 9/20/93 NS NS NS NS NS NS 12/9/93 NS NS NS NS NS NS 3/30/94 NS NS NS NS NS NS 6/2/94 NS NS NS NS NS NS 8/23/94 NS NS NS NS NS NS 12/5/94 NS. NS NS NS NS NS 3/3/95 NS NS NS NS NS NS 6/1/95 NS NS NS NS NS NS 8/15/95 NS NS NS NS NS NS 11/8/95 NS NS NS NS NS NS 2/12/95 NS NS NS NS NS NS FLH ~ Roatln[! Liquid HTdrocarbon$ NS = Not Sampled NA = Not Analyzed I ND = Below the indicated detection limit as labeled in the analytical Labora or¥ reports. [ TABLE 5 I HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-10 3/4/88 2.2 <1 <1 2 . <50 ND 3/14/89 <0.2 <2 <2 <2 <50 ND 10/5/89 <0.2 <2 <2 <2 <50 I~) 3/1/90 DRYWELL DRY WELL DRY WELL DRYWELL DRYWELL DRY WELL 1 / 11/91 DRYWELL DRYWELL DRYWELL DRY WELL DRY WELL DRY WELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRYWELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 9/20/93 ND ND ND ND ND ND 12/9/93 ND ND ND ND ND ND 3/30/94 I",D 1 1 7 ND ND 6/2/94 ND ND ND 9, 6000 ND 8/23/94 ND NDE) I~) 1 I~) NA 12/5/94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 1.7 1 0.9 5.4 ND ND 6/5/95 ND ND ND ND ND NA 8/16/95 ND ND ND ND hO NA I 1/8/95 ND 2 ND ND ND NA 2/12/95 NS NS NS NS NS NS MW-11 3/4/88 10000 89000 3200 37000 240000 ND 3/14/89 FLH FLH FLH FLH FLH FLH 10/5/89 FLH FLH FLH FLH FLH FLH 3/1/90 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 1 / 11 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 4~5~91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRY WELL DRY WELL DRYWELL DRYWELL DRYWELL 9/20/93 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 12/9/93 27 280 220 630 4300 ND 3/30/94 10 120 70 4800 120000 ND 6/3/94 ND ND 5 290 19000 ND 8/23/94 7 11 53 400 66000 NA 12/5/94 DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 3/3/95 21 3.4 2.9 75 7200 ND 6/5/95 ND 170 ND 410 1622 NA 8/16/95 ND ND ND ND ~ NA 11/8/95 NS NS NS NS NS NS 2/12/96 NS NS NS NS NS NS FLH = Floating Liquid Hydrocarbons NS = Not Sampled J NA = Not Anal~,zed ! ND = Below the indicated detection limit as labeled In the anal},tical Labora Dry reports. I T^~.~ 5 I I I I H~STORIC~ GROUNOWATER MoNrrORING I I I ' ANALYTICAL DATA I I ............... I ..................................... MW-1 lA 9/15/92 1.3 1 7 NA 75 NA 9/20/93 NS NS NS NS NS NS 12/9/93 NS NS NS NS NS NS 3/30/94 ND ND ND g ND ND 6/3/94 ND ND ND 4 300 ND 8/23/94 ND ND ND 4 ND NA 0.7 ND ND 12/6/94 2/12/96 2.3 NA 3/3/95 1 6 g 4.5 6/5/95 140 240 320 1040 850 NA 8/16/95 ND ND ND ND ND NA 1 1/8/95 ND ND ND ND ND NA 1.3 ND NA MW-12 3/4/88 3/14/89 10/5/89 3/1/90 1/11/91 4/5/91 6/15/91 9/20/93 12/9/93 4/1/94 6/3/94 8/23/94 12/5/94 3/3/95 6/5/95 8/16/95 11/8/95 600 3700 42000 100000 ND 4200 FLH FLH R.H FI..H FLH FLH FLH FLH FLH FLH F1J-I FLH DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 230 2800 620 1300 150000 ND 30 1200 1200 6700 39000 ND 70 780 920 5100 220000 ND 10 160 40 680 185000 NA 19 34 250 1400 87000 NA DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 40000 52 410 120 250 ND 590 5110 NA NS NS NS NS NS NS NS NS NS NS NS NS 2/12/96 NS NS NS NS NS NS ~:~'~;~ .............. I ............. ~'~"~"~"~'~"~'~'"'""'i'"'"'~'"~'""~'~'?~'~'~'~'~ ................ i ........................ ~'"~'~'~'?'"i~'~ ..................... ~' ........................ i ........................ i":'~ ....................... i ................ '~"~'~'~;~ ................ i ........................ ~ ............ i I6/1/95 I ND I ND I ND I ND I ND I ND I I8/18~95 I ND I ND I ND I ND' I ND I ,A I I 11/8/95I ND I ~ I ~ I ~ I ~! NA I !......~.~,.~ ~..~..~..~.......!. !..~ .!..:..~ ! ! ,~nn ~ I ~.~. I ............................. ............ ............ ......... ............ ............ ............ ........... ........... ...... ~.~.~........~....., .............. ................. , FLH = Floatln(, .lquld Hydrocarbons NS = Not Sam 31ed ~ I NA = Not Anal zed ND = Below the indicated detection limit as labeled In the analytical Labora 3r¥ reports. I TABLE 5 I HISTORICAL GROUNDWATER MONITORING · ANALYTICAL DATA MW-13 1/11/91 2 1.2 1.2 0.8 <50 <50 4/5/91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRYWELL DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL 9/15/92 ND ND NA ND NA NA 9/20/93 5 1 2 1 59 12000 ND 12/9/93 8 9 4 ND I~) ND 3/30/94 9 9 ND 230 8100 ND 6/2/94 3 3 2 27 16000 ND 8/23/94 1 1 8 17 460 NA 12/5/94 2.4 5.3 7,1 10 1100 ND 3/3/95 ND ND ND ND ND ND 6/5/95 ND ND ND ND ND NA 8/15/95 ND ND ND ND ND NA 11/8/95 ND ND ND ND ND NA 2/12/96 NS NS NS NS NS NS MW-14 1/1 1/91 30 3.6 42 32 1100 <50 4/5/91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6 / 15 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/30/93 NS NS NS NS NS NS 6/2/94 NS NS NS NS NS NS 8/23/94 NS NS NS NS NS NS 12/5/94 NS NS NS NS NS NS 3/3/95 NS NS NS NS NS NS 6/5/95 NS NS NS NS NS NS 8/15/95 ND ND ND ND I~) NA 11/8/95 NS NS NS NS NS NS 2/12/96 NS NS NS · NS NS NS MW-14A 9/15/92 1.8 ND NA ND NA NA 9/20/93 ND ND ND ND ND ND 12/9/93 ND ND ND ND M~ ND 3/29/94 ND ND ND ND ND ND 6/2/94 2 4 ND 2 ND ND 8/23/94 ND ND 1 3 ND NA 12/5/94 ND ND ND 0.6 I~D ND 3/3/95 ~:6 0.9 ND 3.6 89 ND 6/5/95 ND ND ND 220 ND NA 8/16/95 ND ND ND ND ND NA 11/8/95 ND 2 3 430 810 NA 2/12/96 ND 8.7 1.3 2000 21000 NA FLH = Floatlncj Liquid Hydrocarbons NS = Not Sampled J NA = Not Analyzed ND = Below the indicated detection limit as labeled In the analytical Labora 3ry reports. ! TABLE 5 I HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-15 1/11/91 1.5 1.1 1 0.5 <50 <50 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/1 5/91 DRY WELL DRYVVELL DRY WELL DRY WELL DRY WELL DRY WELL 9/15/92 ND I~D NA I~) NA NA 9/20/93 ND I~) ND I',D F~ I~D 12/9/93 I~) 1 ND ND ND ND 3/29/94 ND ND ND ND ND ND 6~2~94 ND ND ND ND ND ND 8/23/94 ND ND ND ND ND NA 12/5/94 ND ND ND ND ND ND 3/3/95 1.6 1 0.9 5.4 ND ND 6/5/95 ND ND ND ND 510 NA 8/15/95 ND ND ND ND' ND NA 11/8/95 ND ND ND ND ND NA 2/12/96 NS NS NS NS NS NS MW-16 1 / 11/91 <0.1 <0.5 <0.5 <0.5 <50 <50 4 / 5 / 91 NA NA NA NA NA NA 6 / 15 / 91 NA NA NA NA NA NA 9/15/92 ND ND NA ND NA NA 9/20/93 ND ND ND ND ND ND 12/9/94 ND ND ND ND ND ND 3/30/94 ND ND ND ND ND ND 6/2/94 ND ND ND ND ND ND 8/23/94 ND ND ND 1 ND NA 12/5/94 ND ND ND 0.8 ND ND 3/3/95 1.6 0.7 ND 2.3 ND ND 6/5/95 ND ND ND ND ND NA 8/15/95 ND ND ND ND ND NA 11/8/95 ND ND ND ND ND NA :NA = Not Anal; 2/12/96 NS NS NS NS NS NS NS = Not Sampled ND = Below the indicated detection limit as labeled In the analytical Labora',ory reports, ,/ · Environmental Consuk~n~s Ms. Dolores Gough Kern County Environmental Health Servtces Department 2700 "M' Street, Suite 300 Bakersfield, California 93301 Re: Davies Oil Site, 33051/2 Gulf Street, Bakersfield, California Dear Ms. Gough: Pursuant to your· request on March 2'1, 1996, please find enclosed copies of the chromatograms for water samples from groundwater monitoring wells MW-!4A, M W-!2A, and MW-2. In an effort to make comparison of the chromatograms easier, v:e h.~ve also enclosed transparent reproductions of the chromatograms. As you are aware, MW-'i4A is located approximately 700 feet downgradient ot th~ Davies Oil site, whereas, M'~%.12A and ?,47~.2=are located at the southwest end of. the Davies Oil site. A comparison of the clxromatograms reveals that all three (3) '~' samples are character'istic'of gasoline chromatograms; however, there are significant differences in the ratios of lighter end components (eluding at 14-23.5 minutes) to · heavier end components (eluding at 23.5-28 minu~es) between the on and off-site samples. M W-2 and MW-12A are located on-site and have very similar chromatographic characteristics. The actual peaks are nearly identical and the ratio of light-end to. heavy end components are both approximately 2%. This. type.c,f chromatogram is indicative of a. highly degraded ~gasoline. M W-14A is located 700 feet downgra.dient of the site..The chromatographic characteristics of this sample was not similar to the chromatographic characteri, stics of the two (2) on-site samples (MW-.2 and MW-12A). Peak to peak correlation wa.,; poor and the ratio of light-end to heavy, end components was approximately 10%. The sharpness of *,.he peaks and the relatively high ratio of light vs. heavy end components is ind'.'cati~,re of a fresh or non-degraded gasoline. Based uPon this analysis, it appears that MW-2 and MW-12A have a common source and MW-14A is part of a separate plume whose source is independent of the Davies Oil site. Respectfully Submitted, AOUAGEOSCIENCES, INC. Phili oalwin, ~ , Principal I-~ Registration. Expires 11/30/96 4440 Gri~som Street, Suite 100 · Bakersfield, Calitbrnia 93313 (805) 836-8100 · FAX (805) 836-8800 (800) 30t4244 Lab n~ : I~lc,yon L~I: tory Client : Aqua 6eosc'ie~£es Inc: Client ID: Davies Method :' LUFT Lab ID : 96A Description : CHANNEL 3 Components : 1224GAS.CPT Data file : TglSR25.CHR () Sample: mw-12-a Operator : KIM OAILEY Comments : : TPH as Gasoline by California LUFT Manual Comonent TPH GAS TPH GAS Retention 18.850 31.816 Area 346.23 16137.45 2 Lab naae · I~lC.~. Lat~- to~y Client - Aq~. ' Geoscle~e lnc. Lab ID : ~ ~scription : ~ 3 C~nents : I~.CPT Data fi le : 121~17.~ () S~le: ~2 ~rator :kIM ~ILEY C~nts : : T~ as Gasoline by California LU~ Manual Camonent TPH GAS TPH GAS TPH GAS Retention 15.823 18.908 31.858 16.60 64.34 1378.96 3 1459.90 Lab n~e: Ha),¢yon Laborator~ C1 lent : AqUa Geosciences ~. Client ID : ~$~ ~th~ : L~ Lab IO : ~9~ ~scription : ~ 3 C~ents : I~.CPT ~ta fi le : ~I~6.CHR () S~le: ~-14-a~ ~rator : KIN ~ILEY C~ts : : : TPH as ~soline by California LU~ Manual : ' ",',~,' '' ~ ' ,,' . - '~ ' ,'. ..... ' ........ '.~, · ~ '-~ '.~ ~ ,": ' ."'. :~' ".L..' .... . .."....'.:,,~-:' ~, ~'~ ' ,' '~" .~ ,'~ · t Canponent Retenti on Area TPH GAS 15.783 19.23 TPH GAS 18.850 2056.29 TPH GAS 32.300 4855.46 3 6930.99 ( Lab name : Halcyon Laboratory Client : Aqua Geosciences Inc. Client ID : Davies Method · LUFT Lab ID : 96A69_ Description : CHANNEL 3 Components : 1224GAS.CPT Data fi le : T212R26.CHR () Sample : ~-14-a Operator : KIM DAILEY Comments : : TPH as Gasoline by California LUFT Manual .- -12,800mV 128,000mV Component Retention Area TPH GAS TPH GAS TPH GAS 15.783 19.23 18,850 2056.29 32.300 4855.46 ~q, 1 ?o 3 6930.99 Lab name : Halcyon Laboratory Client : Aqua Geosciences Inc. Client ID : Davies Method : LUFT Lab ID : 96A Description : CHANNEL 3 Components · ~ 1224GAS.CPT Data 1~i le : T212R17.CHR () Sample : mw-'2 Operator : KIM DAILEY Comments : : TPH as Gasoli ne by Call fornia LUFT Manual : -3.200mY 32. O00mV Component Retention Area TPH GAS 15.833 16.60 TPH GAS 18.908 64.34 TPH GAS 31.858 1378.96 3 1459.90 Lab name : Halcyon Laboratory Client : Aqua Geosciences Inc. Client ID : Davies ~_Method : LUFT Lab ID '. 96A Descripti on : CHANNEL 3 Components : 1224GAS. CPT Data fi le : T212R25.CHR () Sample : mw-12-a Operator : KIM DAILEY Comments : : · TPH as Gasoline by Cali fornia LUFT Manual -51.200mV 512.000mY Component TPH GAS TPH GAS Retention 18.850 31.816 Area 346.23 16137.45 2 164~.68 SOIL VAPOR SURVEY REPORT DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORNb~, DELTA PROJECT NO. 40-87-326 Delta Environmental Consultants, Inc. I I I I I I I I SOIL VAPOR SURVEY REPORT DAVIES OIL COMPANY 3305-U2 GULF STREET BAKERSFIELD, CALIFORNIA DELTA PROJECT NO. 40-87-326 Prepared by: DELTA ENVIRONMENTAL CONSULTANTS, INC. 3330 Data Drive, Suite 100 Rancho Cordova, California 95670 (916) (~s.2oss November 20, 1990 I I I I I I I I I I I I I I I I I TABLE OF CONTENTS 1.0 INTRODUCTION ........................................................... 1 1.! Scope of Work ..................................... ~ ......... 1 2.0 BACKGROUND INFORMATION .............................................. 2 2.1 Site Location and..,Description ................................... 2 2.2 Previous Work Conducted at the Site .............................. 2 3.0 SOIL VAPOR SURVEY RESULTS .............................................. 3 4.0 SITE WORK ............................................................... 3 4.1 Monitoring Well Installation .................................... 3 5.0 SCHEDULE ................................................................ 3 6.0 REMARKS/SIGNATURES .................................................... 5 Tables TABLE 1 Soil Vapor Survey Results ...................................... 4 FIGURE '1 FIGURE 2 FIGURE 3 FIGURE 4 Figures Site Location Map Site Vicinity Map Showing Locations of Soil Vapor Points ho-Concentration Contours of Total Volatile Hydrocarbons - October 10 - 12, 1990 Proposed Monitoring Well Locations APPENDIX A APPENDIX B Appendices Field Methods and Procedures Field Work Sheets and Gas Chromatograms I I I I I I I I I I I I I I I I I I I SOIL VAPOR SURVEY REPORT DAVIES OIL COMPANY 3305-1/:l GULF STREET BAKERSFIELD, CALIFORNIA DELTA PROJECT NO. 40-87-326 1.0 INTRODUCTION On October 10, 11, and 12, 1990, Delta Environmental Consultants, Inc. (Delta), conducted a soil vapor survey (SVS) on behalf of Davies Oil Company (Davies), 3305-1/2 Gulf Street, Bakersfield, California. The SVS was conducted at 3530 and 3624 Pierce Road, owned by Messrs. Jim Boylan and Cyril Andre, respectively, as well as the Davies property. Figure 1 presents the site location map. The purpose of the SVS was to help define the downgradient extent of the petroleum hydrocarbon plume in soil and ground water due to a gasoline release of approximately 2,500 gallons in the Fall of 1985. Results of the SVS will also be used to assist in off-site monitoring well placement and to pursue site remediation. 1.1 Scope of Work Right-of-entry agreements between Davies and Messrs. Andre and Boylan were signed November 1989 and August 1990, respectively. Underground Service Alert (USA) was contacted by Delta for identification of all underground utility locations prior to beginning the SVS. A total of 25 soil vapor points were installed and sampled for benzene, toluene, ethylbenzene, m,p-xylenes, o-xylene, and total volatile hydrocarbons. Soil vapor point locations are presented on Figure 2. Soil vapor samples were collected from probes inserted into the soil at a depth of 25.5 feet below ground surface at each soil vapor point. Samples were then analyzed using a portable gas chromatograph (GC). Descriptions of soil vapor sampling and GC operation techniques are provided in' Appendix A (Field Methods and Procedures). I I I I I I I I I i I I ! I I I I SOIL VAPOR SURVEY REPORT Davies Oil Company 3305-1/2 Gulf Street, Bakersfield, California Delta Project No. 40-8%326 Page 2 2.0 BACKGROUND INFORMATION 2.1 Site Location and Description Davies property is currently occupied by an operating gasoline and diesel service station and related office buildings. In addition, a ground water recovery and treatment system is on the property. System operation continues to be shut down from February 19, 1990, due to a continuously decreasing water, table. The Andre property is occupied by two buildings containing several commercial and retail offices, a parking lot, and a residence located in the northeast corner of the property, adjacent to the Davies property.' The Boylan property is occupied by a steel and pipe distribution business (Figure 2). 2.2 Previous Work Conducted at the Site Petroleum product releases were detected and identified in the soil and ground water at the site. Information relating to on-site hydrogeological assessment, ground water cleanup, and all work conducted at the site from July 1986 to August 1990, is discussed in the following reports: Report Proposed Hydrogeologic Investigation Proposed Hydrogeologic Study Subsurface Contamination Assessment Quarterly Monitoring Results and Proposed Additional Work Quarterly Monitoring Report Proposal ]'or Additional Site Assessment and Remedial Action Semiannual Ground Water Monitoring Report at~l Proposed Additional Work Remedial System Monitoring Report Remedial Action Status and Semiannual Ground Water Monitoring Report Work Plan for Additional Off-Site Hydrogeological Investigation and Project Status Date Author February 25, 1987 Twin Cities Testing (TCT) April 22, 1987 TCT July 9, 1987 TCT January 10, 1988 Delta June 10, 1988 Delta November 9, 1988 Delta May 25, 1989 Delta August 18, 1989 Delta February 28, 1990 Delta August 24, 1990 Delta I I I I I I I I I I I I I I I I I I SOIL VAPOR SURVEY REPORT Davies Oil Company 3305-1/2 Gulf Street, Bakersfield, California Delta Project No. 4047-326 Page 3 3.0 SOIL VAPOR SURVEY RESULTS A total of 25 soil vapor points were installed to a depth of 25.5 feet below ground surface throughout the three properties (Figure 2). Collected soil vapor samples were analyzed for benzene, toluene, ethylbenzene, m,p-xylenes, o-xylene, and total volatile hydrocarbons using a portable GC. Sample collection depth and GC analytical results are presented in Table 1. Gas chromatograms and field work sheets are presented in Appendix B. SVS results indicate that total volatile hydrocarbon concentrations in the soil vapor range from less than I to 30,000 parts per million by volume (ppmv). Highest S°il vapor concentrations were found at soil vapor points SP-7 and SP-8 on the property owned by Mr. Andre. On the basis of these results, isoconcentration contours for total volatile hydrocarbons at 25.5 feet below ground surface have been produced and are shown on Figure 3. These contours indicate that the areal extent of the petroleum hydrocarbon plume does not appear to extend into Pierce Street to the west. In addition, the plume does not appear to extend beyond midway through the Boylan property to the south. 4.0 SITE WORK 4.1 Monitoring Well Installation A detailed description of monitoring well installation and subsequent soil and ground water sampling procedures are provided in Delta's Work Plan for Additional Off-Site Hydrogeological Investigation and Project Status Report, August 24, 1990. Proposed locations for three off-site monitoring wells (MW-13, MW-14, and MW-15) and one on-site monitoring well (MW-16) are shown in Figure 4. 5.0 SCHEDULE Monitoring well installation is scheduled for completion in December 1990. Subsequent to monitoring wetl installation and laboratory analyses of ground water samples, a problem assessment and conceptual remediation plan report will be submitted in January 1991. After review ~nd approval of this report by the California Regional Water Quality Control Board, Central Valley Region, and the Kern County Health Department, site remediation work can begin. I I I I I I I I I I I I I I I I I SOIL VAPOR SURVEY REPORT Davies Oil Company 3305-1/2 Gulf Street, Bakersfield, California Delta Project No. 40-87-326 Page 4 TABLE 1 Soft Vapor Survey Results (ppmv) October 10- 12, 1990 Sample Depth - 25.5 Feet Below Ground Surface Ethyl- Total Volatile Location Benzene Toluene benzene M,pzX¥1ene O-Xylene Hydrocarbons $P-1 ,a 74 (ll0)b (110) 36 700 SP-2 * 490 (240) (240) 62 2,200- SP-3 53 60 2.8 61 19 69.0 SP-4 0.08 1.5 (1.1) (1.1) 0.33 7.3 SP-5 440 160 5.6 0.74 2.0 1,400 SP-6 0.07 N-Dc ND ND ND 1.9 SP-7 * 840 6,200 1,300 100 30,000_ SP-8 , **~1 470 5,500 1,200 27,000 ' SP-9 * 27 0.92 30 4.4 660 SP-10 3.5 6.4 0.75 17 ND 110 SP-11 3.6 4.1 0.25 13 0.10 180 SP-12 * 120 (20) (20) 14 4,000- SP-13 310 20 6.6 75 9.3 950 SP-14 70 18 (114) (114) 38 730 sp-x5 c~ 220 (92) (92) 34 820 SP-16 0.27 Z8 (4.9) (4.9) 1.3 11 SP-17 ND 0.11 ND 0.49 0.19 1.4 SP-18 ND ND ND 0.19 0.09 1.6 SP-19 0.16 69 0.76 5.1 0.72 82 SP-20 ND 0.09 0.01 0.45 0.05 0.86 SP-21 ND ND ND 0.36 ND 0.49 / s?-22 o.9o o.56 o.o6 0.39 0.20 8.1 - SP-23 ND 0.09 ND 0.27 0.01 1.5 SP-24 14 ND ND ND ND 88 - SP-25 * 150 35 380 22 3,100 - aCompounds eluting around benzene's retention time interfered with the benzene peak. It was not possible to separate out and calculate a value for benzene. bEthylbenzene and m,p-xylene peaks overlapped and calculation reflects combined peaks. CNot detected. dCompounds eluting around toluene's retention time interfered with the toluene peak. It was not possible to separate out and calculate a value for toluene. I I I ' I I I I I I I I I I I I SOIL VAPOR SURVEY REPORT Davies Oil Company 3305-1/2 Gulf Street, Bakersfield, California Delta Project No. 40-87-326 Page 5 6.0 REMARKS/SIGNATURES The recommendations contained in this' report represent our professional opinions, and are based in part, on information supplied by the client. These opinions are based on currently available information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended. DELTA ENVIRONMENTAL CONSULTANTS, INC. This report was prepared by: Linda S~hneider Senior Technician Date ///~/.~/~ This report was reviewed by: Mark tC Jones Project ToxicologiSt Sudhakar R. Talanki Project Engineer/Project Manager Date The work performed in this report was done under the supervision of a California Registered Geologist: Brian L. I~o~sen~, ~ California Registered Geologist #2303 /law I I I I ! I I I I I I I I I ! I I I I I i / Oil !','~, 1: GENERAl. NOTES: BASE MAP FROM IJ.S.G.S. OILDALE, CA. 7.5 MINUTE TOPOGRAPHIC QUADRANGLE LOCATION Primary Sch .:_~ -~, 'd t37 %'- '" -- ~'~"%, o o ~g=='=.--. == %",' .o o°Oe ;u, o "~ , - .rd.. o%"1' .':'": I INorth 0 2000 FT SCALE I: 24 000 Ball Park FIGURE 1 SITE LOCATION MAP DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD, CA. 40-87-326 I.H. 5/12/89 A Delta ~ HO. ~ ~/'A £.vh~nmental SBT 5125189 CeM~IMM~ Inc. PIERCE /:lOAD i' '-'North PARKING SP-18, SP,-17 ' ' - RUSH SWOAPE ~'RE1 ! I i ,, TEAMSTERS i i LOCAL UNION PROPERTIES BAKERSFIE.D A-1 ACCO . NO.87 LEGEND:. FRICTION BATTERY i CABLE 3UlLDING SP-231 _~ i ~ TRUCK ~IATERIALS SERVICE i SPLICING , · i i WASH · SP-1 SO~. VAPOR p/31NT LOCATION ' ' COVERED ~u ABANDONED : BUILDING ~) MW-1 MONITORING WELL LOCATION t STORAGE PIERCE ,~f~VATE WB.L STORA ~ SP-15 _ OPEN SPACE .' Sp. ~2~ I - i SP-13 SP-~4, , ~ ~ LEAK : ! SP- OFFICES I RUSH SWOAPE DIESEL ' L__ __J ~ '10 DELTA IN JULY, 1990 i, SUPPLY uPS BUE.DIN6 SP-8 · SP-7 / /STORAGE MW-5 , . n,,// ' i ' " PIPE STORAGE ' '~ x' SITE VICINITY MAP SHOW!~IG LOCATIONS OF ' INFILTRATION GALLERY UNDERGRO~ SOIL VAPOR POINTS STORAGE (COVERED SURFACE) I ' TANK DAVIES OIL coMPANY 3305 1/2 GULF STREET TRAILER PARK BAKERSFtFI . ~ ~ NO.. RLWIEWED ~rY/ Cor~ultarr~ lnG. ' ' - TEAMSTERS RUSH SWOAPE LOCAL UNION PROPERTIES SP-16 NO.87 STO~AGE~ PIERCE ,F~VATE WElL ; ·PLAZA , ~ SP-15 ~P-13 SF).14 · ~ KEN SP- OFFICES ! RLISH SWOAPE DIESEL ' PLANTERS KERNV# 1 i= STAGE PROPERTIES SP.24 8P-8 MW-12 MW-2 U ~ ' · /STORAGE MW-5 j , OFFICE' t ~'r'/ ,,,, {~ BUILDING SP-4 ~ ,,~ MW-3 ~..~ OIL ISLANDS COMPANY MW-.4 !~ (~ ISLANDS F~I~P , STORAGE c::= UNDERGROUND INFILTRATION GALLERY STORAGE (COVERED SURFACE) TANK TRAILER PARK I I I I I I I I I I I I I I I I I PIERCE ROAD '1 North r ~) Mw-1 MONITORING WELL LOCATION & RW-1 RE~ WELL ~TION ® aw WEU. · ~ 1~- ~A[ ~AT~ HY~ ~ ' ~TS ~ ~: (25.5 ~ ~ FIGURE's, 3 UNOER~0UND INF1LTRATIO~N GA, I~Y, IE O-CONCENTRATION CONTQURS OF TOTAL VOLATILE STORAGE (COVERED SURF.-A~E) HYDROCARBONS - OCT 10-12, 1990 DAVIES OIL COMPANY TANK 3305 112 ~ STREET 'm^,.a~ ~.K I ~ ~~, c~. -"-.--.,.~ cra,, ~o.w..~...~ .., I ..~ / SP-16 NO,,~7 ISl'ORAGiE ~ PIERCE\ ~W:~VATE WlEI.L PLAZA-\ e ' ' ~P.~s , \ , ' , ':"~ \ ! ,"'~~ , , ' "%  ~ " MW 5 e ~.~ - , .w.,o = ~ O~ ~ C~NY MW~ ~/~ ' · ~ ~ V////~///~ TANK ~A~ ,~3..87- 32'6 Lit 10{24~0 ~ -', I 5 ~'F * l!zo,)5 o , c,e~a~l'mm'~,. Inc. I, I I I I I I I ,I I I I I :1 I I I I PIERCE ROAD M"(? 14w- DRIVE WAY NorU~ · SP-1 SOtV.~ ~ORPOINTLOCATION ~ MW-1 MONITORIN~ WELL LC)CATION PROPOSED MOI~TORING WELL (~) MW-13 e 100 ,. (~- OCTOBER 10-12, 1990 PROPOSED MONITORI,~IG WELL LOCATIONS ' DAVIEs OIL C~VIPANY 33o5 '~/2 Gu.k, S'mEET IH. 11/14/90 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I APPENDIX A Field Methods and Procedures I I I I I i I I 1 I I I I I I I I 1.0 SOIL VAPOR SURVEY METI~ODS AND PROCEDURES The following describes field methods and procedures followed by Delta personnel in the performance of the soil vapor survey. 1.1 S0il Vapor Survey Theory. Soil vapor surveys are a preferred technique for delineating the horizontal extent of soil vapor plumes in near-surface soils (to approximately 30 feet below grade). The technique directly measures soil vapor concentrations of volatile petroleum hydrocarbons at a given depth. Petroleum hydrocarbons within the unsaturated zone are distributed between three phases; (1) soil moisture, (2) soil vapor, and (3) adsorbed to soil. The distribution of a contaminant within the three phases is a function of its solubility and volatility. Other factors influencing this distribution include the soil organic carbon content, pore size and soil moisture. Petroleum hydrocarbons in the soil may be derived from a number of processes including direct passage of free phase contamination from a release through the soil, lateral migration of vapors from a release, or vertical migration of vapors emanating from contaminated groundwater as the contamination migrates along the ground water/soil interface. On the basis of these and other physicochemical properties and behaviors of petroleum hydrocarbons, soil vapor contamination may be associated with ground water, soil, or free-phase contamination. The soil vapor survey takes advantage of this and, through the collection and analysis of soil vapor, permits rapid delineation of the extent of contamination and/or soil vapor migration routes. 1.2 Soil Vapor Sample Collection Soil vapor samples are obtained by advancing soil vapor probes with perforated tips to the desired depth using a demolition impact hammer. Soil vapor samples may be collected from several depths at a single sampling location. After advancement, a sampling port attachment is connected to the soil vapor probe. Before sample collection, a vacuum pump is used to purge the probes and to draw soil vapor from the desired sampling depth. The vacuum pressure reading on the purging apparatus is recorded. This vacuum pressure is related to the soil's gas permeability: a high vacuum reading suggests that there is a resistance to soil gas movement and a vacuum is being created between the tip of the probe and the pump. If this high vacuum is maintained through the pumping period, a representative sample of the soil vapor may not be obtained, and inaccurately Iow hydrocarbon readings may result. In most situations, when the probe is I $ I I I I I I I i I I I I I I I A-2 isolated from the vacuum pump the probe vacuum pressure readings decrease. A Iow reading indicates that there is a free flow of soil vapor from the unsaturated zone through the probe, and after purging, the sample is assumed to be representative. The soil vapor samples are collected through a septum in the sampling port attachment with a microsyringe and injected into a Photovac 10S50 gas chromatograph for analysis. Following analysis from the final depth at each sample location, soil vapor probes are extracted and washed in a soap solution and doubled-rinsed to reduce cross-contamination between sampling locations. 1.3 Analytical Procedures and Interpretation of Results The Photovac 10S50 is a portable, programmable, integrating gas chromatograph with a photoionization detector (P1D). The PID is a nondestructive flow-through detector that uses high energy ultraviolet radiation as its ionization source. Soil vapor samples are injected into the gas chromatograph, separated on a capillary column, and sensed by the PID. The ultraviolet radiation ionizes compounds, generating an energy increase detected as an electrical signal, which is measured in Volts. This increased energy is integrated across time by the instrument to give a value for the peak in volt-seconds (V-sec). The instrument is calibrated with known standards of benzene, toluene, ethylbenzene, m,p-xylenes, and o-xylene. Following calibration with each standard, the instrument stores each known standard concentration and its corresponding V-sec response. The ratio for each standard, shown in V-sec:ppm, is then used to quantify the concentrations of identifiable vapors in field samples according to their measured V-sec. The concentrations of unidentified compounds are calculated in a similar manner. Although petroleum hydrocarbons produce variable instrumental responses, the assumption may be made that the hydrocarbon constituents detected have response-to-concentration ratios approximately equivalent to that of benzene and that each may be quantified based on the ratio for benzene. Total volatile hydrocarbons represent the sum of all V-sec responses measured, proportioned to the standard for benzene. The gas chromatograph is operated in backflush mode to prevent contamination of the capillary column with high concentrations of interfering compounds. Blanks are run to ensure that the system is free of contamination. As necessary, the instrument is re-calibrated by injecting standards and by running ambient air blanks approximately every two hours throughout the day. This recalibration ensures that the system is operating consistently and that parametric changes caused by temperature changes through the day are corrected. These data, along with multiple standard runs, provide analytical quality assurance. I I I I I ! I i I I I I I I i I I APPENDIX B Field Work Sheets and Gas Chromatograms ,I I I I I ! I I I SOIL VAPOR SURVEY FiELD WORKSHEET ~a~r. _LO/lO~g0 -4 100 -- 100 I00 I0O io~ io~ // /~0 ,/oo I lq !7- io 6' io~ i00 j~O / -- / Snmplel m fl.) m m m mm m m 'CD m m m m m r~ m m m (( m m m m ,[~1 !/H: / F-- fi ',- I I I I I .I I $CII.. VAPOR 109 i00' I00 /Of) PA l~q teg~ ? /0 l~0 lcd> /OD., (1/,o' ill U~ I i., :, IUI II/ 4 Ch.mlot ~ Stn,dnrd Volum~ l,J~etlo,! V~l,~ I,Je~ted~ JO, '0 CZ) 'T Stnmln~l Volump. I~Jeetloflt Stnmlnr(I Volume lnJeel:lotll ~...~.,'-~O~k "3 Vulu~ InJectea~~ Vol~tme l.J ee t ~d tjX__ I~o~ /Uo,"~b c~ u I Volume Inject [onl__ 5'P--' I~' S.m,~., .DP'I$ ...... roi.me I I I I I I Cbemlot f :: Snmp I e I V~.* I ume I.Jected~ L .! ..! 3P-z~, 'o~ I/ /~.~ /~ Moo I 7 // /$ iq /& 10o lOO jio0 , i~0 106; VoltJme Chemln{ ~ St:~mln td Vol ttmo m ( m m m m m m m m m. m m CI, emlflt~ -5- mm m m ,m m Cho. mJ.~ t ~ · ~nml,]tel .. <~. Volume I.Jeetea~~ von,.,, t,,.t.~ ~ ea,/OO ' _ .. ! Cheml ~t ~ Stn.tlnt'(! VoJt~me l~Jeetlof~l__ I V~lume I nj I I I I I ChemJ.~t f 5tnml,,'d Volumo lt~JeetJ[ol~l Volume ii Stnmfo~l V*lumo l~e(~tlotll Volume l.J eot cdr_- ~0~) ' _ II I I I I I I I I I I I I I I I I I REMEDIAL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CAI,IFORNL~ DELTA .r,,'~*:~ ~'r .... - ..... ! t. L. '[ Delta Environmental Consultants, Inc. Delta Environmental Consultants, Inc. 3330 Data Drive Rancho Cordova, CA 95670 916/638-2085 F^X:916/638-8385 February 28, 1990 Mr. Bill Davies Davies Oil Company Post Office Box 80067 Bakersfield, California 93380 Subject: Remedial Action Status arid Semiannual Ground Water Monitoring Report Davies Oil Company, 3305-1/2 Gulf Street Bakersfield, California Delta Project No. 40-87-326 Dear Mr. Davies: Enclosed is a copy of the referenced report for the subject site. Additional copies of this report are being forwarded to the regulatory agencies identified below. This report fulfills the requirements for the monitoring and reporting program (MRP) No. 89-025. It has been a pleasure serving you on this project. If you have any questions regarding this report or need additional information, please call me at (916) 638-2085. Sincerely, DELTA ENVIRONMENTAL CONSULTANTS, INC. Sudhakar Talanki Project Engineer/Project Manager ST:law Enclosure cc/eric: Mr. Jong Han, California Regional Water Quality Control Board, Central Valley Region, Fresno Ms. Dolores Gough, Kern County Health Department Mr. Cliff Calderwood, Kern Count)' :\ir Pollution Control District Practical Solutions to Environmental Concerns REMEDIAL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORN/A DELTA PROJECT NO. 40-87-326 Prepared by: Delta Environmental Consultants, Inc. 3330 Data Drive, Suite 100 Rancho Cordova, California 95670 (9~6) 6~s-2o~ February 28, 1990 TABLE OF CONTENTS 1.0 INTRODUC'rION 1.! Scope of Work 2.0 BACKGROUND INFORMATION 2.1 Site Location and Description 2.2 Previous Work Conducted at' the Site 3.0 PROJECT RESULTS 3.1 Ground Water Recovery/Treatment System and Gradient Control 3.2 Ground Water Elevations and Flow 3.3 Semiannual Ground Water Monitoring 4.0 DISCUSSION OF RESULTS 4.1 Ground Water Recovery/Treatment System and Gradient Control 4.2 Ground Water Elevations and Flow 4.3 Hydrocarbon Plume Capture 5.0 PROPOSED ADDITIONAL WORK 5.1 Right-of-Entry 5.2 Soil Vapor Survey and Additional Monitoring Wells 5.3 Vapor Extraction System (VES) 6.0 RECOMMENDATIONS 7.0 REMARKS/SIGNATURES 2 2 2 3 3 5 5 12 12 12. 12 13 13 13 13 14 15 TABLE 1 TABLE 2 TABLE 3 FIGURE 1 FIGURE 2 FIGURE 3 Tables Ground Water Treatment System Analytical Results Ground Water Elevation Data and Physical Observations Ground Water (Monitoring Well) Analytical Results Figures Site Location Map Site Map Inferred Hydrocarbon Plume Migration 4 6 10 Appendices APPENDIX A Analytical Laboratory Results APPENDIX B Ground Water System Monitoring APPENDIX C Theoretical Capture Zone Calculations for Recovery Well RW-1 APPENDIX D Right-of-Entry Correspondence REMEDIAL ACTION STATUS AND SEMIANNUAL 'GROUND WATER MONITORING REPORT DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORNIA DELTA PROJECT NO. 40-87-326 1.0 INTRODUCTION Delta Environmental Consultants, Inc. (Delta), is submitting this report on behalf of Davies Oil Company, Bakersfield, California, in accordance with the Monitoring and Reporting Program (MRP) No. 89-025 dated March 13, 1989, issued by the California Regional Water Quality Control Board, Central Valley Region (Regional Board), Fresno, California. The MRP was issued as part of the waste discharge requirements for Davies Oil Company, Ground Water Cleanup Project. Delta has been 'authorized by the client to assist in investigation and remediation of the site due to a gasoline release of approximately 2,500 gallons in the fall of 1985. Figure 1 presents the Site Location Map. 1.1 Scope of Work Since Delta's last report (dated August 18, 1989), the following work was performed: Continued operation and monitoring of the ground~ water recovery and treatment system by monthly site visits (August 1989 through February 1990). The system was shutdown due to a continuously decreasing water table (a decline in water table elevation of approximately 4.6 feet between June 26, 1989, and February 7, 1990). This shutdown was required because the water pump and level controls in recovery well RW-1 cannot be operated under this low water condition. Monthly air emissions and system condition reports were submitted to the Kern .county Air Pollution Control District (Air District) and the Regional Board. A Permit to Operate was obtained from the Air District to continue operation of the air stripper. · Water and free product levels in monitoring wells were measured. REMEDIAL AC-TI'ION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 2 · Semiannual ground water sampling was performed in October 1989. A site inspection was performed by Mr. Jong Han of the Regional Board on November 9, 1989. The site visit was scheduled to coincide with the monthly system sampling and water samples collected were split with Mr. Han so that dissolved hydrocarbon analysis could be performed by both the Regional Board and Delta. Right-of-entry agreements were pursued to obtain access to adjacent properties of Messrs. Cyril Andre and Jim Boylan for off-site investigation of petroleum constituent migration. · A report summarizing the results of work to date, and plans for additional work were prepared. 2.0 BACKGROUND INFORMATION 2.1 Site Location and Description The site is currently occupied by an operating gasoline service station and related office buildings at 3305- 1/2 Gulf Street, Bakersfield, California. The layout of the ground water recovery and treatment system is illustrated in Figure 2. 2.2 Previous Work Conducted at the Site Petroleum product releases were detected and identified in the soil and ground water at the site. The hydrogeological assessment, remedial action plan, and ongoing site remediation to clean up soil and ground water, and all work conducted at the site from July 1986 to August 1989, is discussed in the following reports: Report Proposed Hydrogeologic Investigation Proposed Hydrogeologic Study Subsurface Contamination Assessment Quarterly Monitoring Results and Proposed Additional Work Quarterly Monitoring Report Date Author February 25, 1987 Twin City Testing CFCT) April 22, 1987 TCT July 9, 1987 TCT January 10, 1988 Delta June 10, 1988 Delta REMEDIAL ACYION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 3 Report Date Author Proposal for Additional Site ~lssessment and Remedial Action Semiannual Ground Water Monitoring Report and Proposed Additional Work Remedial System Monitoring Report November 9, 1988 Delta May 25, 1989 Delta August 18, 1989 Delta 3.0 PROJECT RESULTS 3.1 Ground Water Recovery. and Treatment System and Gradient Control The water treatment system is designed to pump ground water from recovery well RW-1 into a packed column air stripper to remove dissolved petroleum hydrocarbons. The effluent from the air stripper is pumped through a particulate filter to remove particulate matter and through two activated carbon filters (in series) to remove any remaining hydrocarbons prior to discharge to the infiltration gallery on site. RW-1 is a 12-inch-diameter, 35-foot-deep well with a two-pump system with automatic level controls; a 25 to 50 gallons per minute (gpm) capacity water pump with conductivity probes and a free product pump with conductivity sensors. The system is equipped with automatic level controls. The details of the system are included in Delta's Proposal. for Additional Site Assessment and Remedial Action Report, dated November 9, 1988. The system commenced, operation on June 29, 1989, with recovery well RW-1 pumping ground water at a rate of approximately 30.gpm. The pumping rate was increased to 35 gpm on August 24, 1989. The system was shutdown from September 21, 1989, to October 4, 1989, for maintenance work on the automatic flow control valve for the air stripper sump. Due to dropping water levels (approximately 4.6 feet from June 29, 1989, and February 17, 1990), the recovery well pumping rate was decreased to 28 gpm on December 6, 1989, to 19 gpm on January 4; and to 15 gpm on February 16, 1990. The system was shutdown on February 19, 1990, as the water pump in RW-1 could not operate under this low water condition. As of February 19, 1990, the system had recovered and treated approximately 8,002,400 gallons of water contaminated with petroleum hydrocarbons prior to being discharged to the infiltration gallery on site. APproximately 57 gallons of free product have been recovered from RW-1 as of February 17, 1990, and stored on site. The laboratory analyses of the ground water treatment system influent, effluent, REMEDIAL AC-'~ON STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davi~a Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 4 ~ oo oZZZZo ZZZoo VV V V VV VVV V ooovo ooov 2o°'o°-o°' VVV V VVV VVVV ZZZZZZZZZZZZ ZZZZZZZZZZZZ ZZZZZZZZZZZZ ZZZZZ ZZZZZ ZZZZZ ZZZZZ ZZZZZ ZZZZZ ZZZZZZZZZ ~m'm~<~~ ZZZZZZZZZ ZZZZZZZZZ ZZZZZZZZZ ~~<~~ ZZZZZZZZZ ZZZZZZZZZ ZZZZZ ZZZZZZZZZ 00 ~ ct} RElvfg. D~ ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 5 and discharge to the infiltration gallery are summarized in Table 1. Copies of the laboratory reports are included in Appendix A. System operation data and monthly reports are included in Appendix B. Figure. 3 shows the theoretical zone of capture for the well at a pumping rate of 19 gpm. The theoretical downgradient stagnation point emends approximately 181 feet from RW-1. The width of capture at the well is 285 feet. The assumptions and calculation methodology for determination of the zone of capture are included in Appendix C. 3.2 Ground Water Elevations and Observations Depth to ground water was measured and physical observation of flee product thicknesses were recorded at monitoring wells MW-10, MW-II, and MW-12 during the site visits. Wells MW-1 through MW-5, MW-8, and MW-9 have been dry since October 1989. Based on measurements from RW-1, the water table has dropped from approximately 23 feet below grade in June 1989 to 28 feet in February 1990. As of February 19, 1990, all monitoring wells on site are dry. The inferred general direction of ground water flow is towards the southwest as described in previous Delta reports. The historical and most recent ground water elevation data and physical observations for each well are presented in Table 2. Measurements dating to July 1986 are included for comparison. 3.3 Semiannual Ground Water Monitoring Monitoring well MW-10 was sampled on October 5, 1989. MW-11 and MW-12 were not sampled at that time because of free product in the wells. Other monitoring wells (MW-1 through MW-4, MW-5, MW-8, and MW-9) were dry in October 1989. The samples were submitted for benzene, toluene, ethylbenzene, and xylenes (BTEX), carbon tetrachloride, and total petroleum hydrocarbons (TPH) analysis by U.S. Environmental Protection Agency (EPA) Method 8240/8260. The analyses of ground water samples from MW-10 showed that the BTEX, carbon tetrachloride, and TPH concentrations were below laboratory detection limits. The results of these analyses are included in Table 3 and a copy of the laboratory report is included in Appendix A. Table 3 also contains analytical results of all monitoring well sampling conducted from May 1987 to October 1989 for comparison. REMEDIAL Ac'rION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 6 Monitoring Well .Date MW-3 TABLE 2 Ground Water Elevation Data and Physical Observations Depth to Ground Reference Ground Water Water [feet) Elevation Elevation 07/11/86 14.86 409.33 394.47 05/08/87 18.23 391.10 10/22/87 19.72 389.61 12/03/87 20.66 388.67 03/04/88 19.09 390.24 05/02/88 21.24 388.09 11/02/88 22.83 386.50 01/13/89 19.93 389.38 03/13/89 20.22 389.11 06/26/89 Dry --- 10/25/89 Dry --- 11/09/89 Dry --- 01/04/90 Dry --- 02/07/90 Dry --- 07/11/86 15.02 409.31 394.29 05/08/87 17.87 391.44 10/22/87 19.35 389.96 12/03/87 20.43 388.88 03/04/88 19.07 390.24 05/02/88 20.70 388.61 11/02/88 22.79 382.56 01/13/89 20.04 389.27 03/13/89 20.45 388.86 06/26/89 Dry --- 10/25/89 Dry --- 11/09/89 Dry --- 01/04/90 Dry --- 02/07/90 Dry --- 07/11/86 15.37 410.22 394.85 05/08/87 18.34 391.88 10/22/87 20.00 390.22 12/03/87 20.77 389.45 03/04/88 19.42 390.80 05/02/88 21.10 389.12 11/02/88 22.86 387.36 01/13/89 20.20 390.02 03/13/89 20.77 389.45 06/26/89 Dry --- 10/'25/89 Dry --- 11/09/89 Dry --- 01/04/90 Dry --- Physical Observations/ Comments Approximately Approximately Approximately Approximately Approximately Approximately 4' free product 0.5' free product 0.06' free product 0.8' free product 0.25' free product 0.2' free product Rainbows visible, strong odor Rainbows visible, no product No product Noticeable odor No odor Slight odor Rainbow visible, slight diesel odor Rainbows visible, no product No product Noticeable odor Slight odor Slight diesel odor Slight odor Slight diesel odor REMEDIAL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 7 Monitoring Well MW-5 TABLE 2-Continued Ground Water Elevation Data and Physical Observations Date Depth to Ground Reference Ground Water .... Water (feet) Elevation Elevation '"' 07/11/86 15.06 409.72 394.66 05/08/87 17.87 391.85 10/22/87 18.46 391.26 12/03/87 20.41 389.31 03/04/88 19.03 390.69 05/02/88 20.58 389.14 11/02/88 22.50 389.22 01/13/89 20.08 389.64 03/13/89 20.30 389.42 06/26/89 Dry -- 10/25/89 Dry --- 11/09/89 Dry --- 01/04/90 Dry -- 02/07/90 Dry --- 03/13/89 06/26/89 10/25/89 18.32 407.62 389.30 21.79 385.83 05/08/87 18.00 409.68 391.68 10/22/87 19.60' 390.08* 12/03/87 20.60 389.88 03/04/88 19.27 390.41 05/02/88 ..... 11/02/88 Dry .-- 01/13/89 Dry --- 03/13/89 20.70 388.98 06/26/89 Dry --- 10/25/89 Dry --- 11/09/89 Dry --- 01/04/90 Dry --- 02/07/90 Dry --- Physical Observations/ Comments Brown; silty No odor No odor, casing wet No odor No odor Not measured Brown; silty No odor No odor, casing wet Not measured 1 1 1 1 1 I 1 I -I REMEDIAL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil CompmV Bakersfield, California Delta Project No. 40-87-326 Page 8 TABLE 2-Continued Ground Water Elevation Data and Physical Observations Monitoring Well MW-10 MW-Il Date 05/08/87 10/22/87 12/03/87 03/04/88 05/02/88 11/02/88 01/13/89 03/13/89 O6/26/89 10/25/89 11/09/89 01/04/90 O2/07/9O 03103/88 05/02/88 11102188 01/13/89 03/13/89 O6/26/89 07/27/89 10/25/89 01/04/90 02/07/9O O3/O4/88 O5/02/88 11/02/88 01/13/89 03/13/89 06/26/89 07127/89 10/'25/89 01/04/90 02/O7/9O Depth to Ground Reference Ground Water Water(feet) Elevation Elevation 15.37 17.38 18.12 16.70 18.26 Dry 17.87 18.20 Dry Dry Dry Dry Dry 17.52 19.28 21.00 18.36 18.82 22.52 23.20 24.53 26.42 27.09 19.23 20.78 23.57 20.62 20.63 24.37 25.95 Dry Dry Dry 408.12 409.43 391.23 389.22 388.48 389.90 388.34 388.72 390.60 389.04 387.12 389.76 389.30 385.60 384.92 383.59 381.70 381.03 390.20 388.65 385.56 388.81 388.80 385.06 384.24 Physical Observations/ Comments Rainbows visible, no product No product Slight odor No odor Slight odor No odor No odor No odor No odor No odor Strong odor No product 0.75' free product 0.5' free product 0.3' free product 0.01' free product 1.02' free product Strong odor Strong odor Strong odor REMEDIAL ACTION STATUS AND SEMIANN UAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 9 Monitoring Well MW-12 RW-1 TABLE 2.Continued Ground Water Elevation Data and Physical Observations Date Depth to Physical Ground Reference Ground Water Observations/ Water Elevation Elevation Comments 03/04/88 18.62 408.67 390.05 Strong odor 05/02/88 20.16 388.51 Slight odor 11/02/88 22.86 385.81 0.5' free product 01/13/89 19.81 388.86 0.2' free product 03/13/89 20.02 388.65 0.1' free product 06/26/89 24.54 384.77 0.94' free product 07/27/89 25.39 384.05 1.02' free product 10/25/89 26.60 383.08 1.35' free product 01/04/90 Dry --- Strong odor 02/07/90 Dry --- Strong odor 11/02/88 23.91 410.09 386.18 0.25' free product 01/13/89 20.82 389.27 0.2' free product 03/13/89 21.15 388.94 0.01' free product 07/02/89 27.69 410.34 382.65 Pumping level at 30 gpm 07/31/89 28.55 381.79 Pumping level at 30 gpm 08/24/89 29.64 380.70 Pumping level at 35 gpm 09/07/89 29.10 381.24 Pumping level at 35 gpm 10/25/89 30.22 380.06 Pumping level at 35 gpm 11/08/89 30.71 379.63 Pumping level at 35 gpm 12/08/89 30.50 379.84 Pumping level at 28 gpm 01/04/90 31.55 379.34 Pumping level at 19 gpm 02/07/90 31.65 378.69 Pumping level at 19 gpm 02/19/90 30.31 380.03 Static level NOTES: *Adjusted elevation for assumed error. --- = Not measured. A specific gravity of 0.75 is assumed for free product corrections. All elevations referenced to the bench mark located near fence corner at northeast end of Gulf Street. The bench mark is a white wood post, elevation 409.50 feet above mean sea level. The well elevations were surveyed by Delta on May 2, 1988. '-] . REM-FD~'AL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 10 Monitoring Well MW-2 MW-4 MW-8 MW-9 TABLE 3 Ground Water Analytical Results Concentrations in parts per million (ppm) Date· Ethyl- Sampled Benzene Toluene benzene X¥1enes 05/08/87b 0.089 NDc ND 0.089 10/22/87 0.005 0.22 ND 0.012 03/05/88 0.013 0.002 0.005 0.039 03/13/89 0.005 0.02 ND 0.02 10/05/89 ...d ......... TPHa 4.1 13 1.3 4 05/08/87b 0.0009 ND ND ND 0354 10/22/87 ND 0.003 0.001 0.01 12 10/05/89 ............... 03/05/88 ND .ND ND ND 29 03/13/89 ND ND ND ND' 0.6 10/05/89 ............... 05/08/87b 0.0018 0.0076 ND 0.0052 10/22/87 0.0001 ND ND ND 03/05/88 ND ND ND ND 03/13/89 ND ND ND ND 10/05/89 ........... 0.022 <0.05 <0.05 <0.05 05/08/87b ND ND ND ND <0.010 10/22/87 ND ND ND ND <0.05 03/04/88 ND ND ND ND <0.05 03/13/89 ND ND ND ND <0.05 10/05/89 ............... 05/08/87b 1.155 3.81 1.74 10/22/87 0.01 1.6 2.2 03/04/88 0.04 1.1 3.6 03/13/89 0.031 0.12 2.2 03/13/89(dup) 0.033 0.13 2.3 10/05/89 ......... . 15.38 37 28 11 14 33.4 170 70 56 61 Type Diesel #2 Gasoline Gasoline Dry Well Gasoline and Diesel Diesel #2 Weathered gasoline Dry well Gasoline Dry well Gasoline Dry well Gasoline Gasoline Gasoline Gasoline Dry well '1. '1 -1 I REMEDIAL AC-~ON STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 11 TABLE 3-Continued Ground Water Analytical Results Concentrations in parts per million (ppm) Monitoring Well MW-10 MW-Il MW-12 Date Ethyl- Sampled Benzene .Toluene benzene X¥1enes 03/04/88 0.0022 ND ND 0.002 03113/89 ND ND ND ND 10/05/89 ND ND ND ND 03/04/88 10 89 3.2 37 03113/89 ............ 10/05/89 ............ 03/05/88 0.6 4.2 3.7 42 03/05/88(dup) 0.9 ' 5.6 2.3 29 03/13/89 ............ 10/05/89 ............ TPHa <0.05 <0.05 <0.05 240 100 70 Gasoline Gasoline Gasoline 0.3' free product 0.86' free product Gasoline Gasoline '0.1' free product 1.08' free product NOTES: aTotal Petroleum Hydrocarbons. bValues from Twin City Testing Corporation, report, dated July 9, 1987. CNot Detected. dNot sampled. 1 I 1 i REMEDIAL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 12 4.0 DISCUSSION OF RESULTS 4.1 Ground Water Recovery/Treatment System and Gradient Control During system operation (June 29, 1989 to February 19, 1990), recovery well RW-1 pumped water with low concentrations of dissolved hydrocarbons. The pumping rates ranged from 35 to 15 gpm. Ground water samples collected from RW-1 indicated TPH concentrations betwee~ 3.3 and 0.5 ppm. Benzene concentrations ranged between 56 and 13 parts per billion. Quarterly sampling of the air stripper effluent indicates the air stripper is 100 percent efficient in removing dissolved hydrocarbon constituents. Laboratory analyses of the treatment system effluent indicate discharge water concentrations of BTEX, 1,2-dichloroethane, ethylene dibromide, carbon tetrachloride, and total lead concentrations are .below laboratory detection limits. The discharge water quality is well within the limits set by the MRP. The continuous drop in water table, approximately 4.6 feet between June 29, 1989, and February 17, 1990, has decreased the drawdown in RW-1 limiting its pumping capacity and the capture zone. The treatment system was shutdown on February 19, 1990, due to inability of the ground water pump in RW-1 to operate at this low water condition. The system shutdown will potentially result in further migration of the hydrocarbon 'plume. 4.2 Ground Water Elevations and Flow Water level measurements from the recovery well and monitoring wells from June 1989 to February 1990 indicate a continuous drop in the water table. The water levels in wells RW-1 and MW-10 dropped approximately 4.6 feet between June 26, 1989, and February 17, 1990. Based on historical site measurements, the water table dropped approximately 12 feet between July 1986 and February 1990. 4.3 Hydrocarbon Plume Capture Hydrocarbon plume capture has been discussed in Delta's Remedial System Monitoring Report, dated August 18, 1989, and the same information is included herein. Data collected over the past 3 years has given a good indication of the on-site hydrocarbon plumes and their direction of migration. This data has been used to estimate the downgradient shape and extent of the hydrocarbon plumes. These plumes are shown in Figure 3 along with the theoretical capture zone for RW-1. The actual shape and extent of the hydrocarbon plumes has not been defined by actual monitoring well installation, and is only estimated. However, based on the data collected to date, it does not appear that RW-1 will be adequate to control the plume of hydrocarbons. An additional recovery well may be necessary; however, this can only be evaluated after the installation of proposed off-site monitoring wells. Delta proposes to conduct a soil vapor survey to locate three additional off-site monitoring wells. These wells will be installed and sampled REMEDIAL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 13 to further define the extent of the hydrocarbon plume. The information obtained during well installation and sampling will be used to propose a location for an additional ground water and/or free product recovery well. Each phase of work must be agreed to by off-site parties. Adjacent property owners, Messrs. Cyril Andre and Jim Boylan, have been contacted by Delta and the Regional Board to obtain right-of-entry in this regard. .... 5.0 PROPOSED ADDITIONAL WORK During the next six months, Delta will undertake the following: 5.1 Right-of-Entry Davies Oil Company has pursued and will continue efforts to obtain right-of-entry from adjacent property owners, Messrs. Cyril Andre and Jim Boylan, for off-site investigation and possible remediation. Recent efforts to obtain this fight-of-entry were in the form of meetings and correspondence (Delta correspondence dated August 2 and November 29, 1989) (copies included in Appendix D). Unless Delta receives the right-of-entry, further work, including additional site investigation/remediation cannot be pursued. 5.2 Soil Vapor Surve,y and Additional Monitoring Wells Figure 3 shows the site vicinity map with the inferred extent of the hydrocarbon plume based on data collected over the past 3 years Out without actual installation of off-site monitoring wells). A soil vapor survey is proposed to be conducted on the adjacent properties owned by Messrs. Cyril Andre and Jim Boylan to aid in locating three monitoring wells to define the off-site extent of dissolved hydrocarbons in ground water. After the hydrocarbon plume is defined by installation and sampling of these monitoring wells, an additional ground water/free product recovery well may be installed and Connected to the existing ground water treatment system, which is designed for a capacity of 100 gpm. 5.3 Vapor Extraction System iVES) The drop in the water table presents an opportunity to recover free product floating on the water table, hydrocarbon vapors, and dissolved volatile constituents in the vadose zone by installation of a VES. By removing these potential sources of long-term ground water hydrocarbon contamination, recharge of dissolved constituents into the aquifer is minimized. The VES is initially proposed to use existing on- site wells, RW-1, MW-II, and MW-12. Depending on the airflow rate and induced vacuum, a VES can influence and remove hydrocarbons from a large area of the vadose zone and accelerate site cleanup. '1 1 1 I REMEDIAL ACTION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 14 6.0 RECOMMENDATIONS The following actions are recommended: Temporary shutdown operation of the ground water recovery and treatment system. Based on dropping water levels and decreasing hydrocarbon concentrations i~ RW-1, it is inferred that hydrocarbons are adsorbed onto the soil. If the water table and' hydrocarbon concentrations continue to drop, it may not be effective to continue to pump from RW-1. The proposed VES would be more effective in removal of hydrocarbons from the vadose zone. Additionally, an off-site ground water recovery well on the downgradient side of the hydrocarbon plume would be more effective for ground water remediation. However, the location for such a recovery well can only be determined after obtaining access to adjacent properties, and completing a hydrogeological investigation to define the off-site extent of the hydrocarbon plume. · Pursue efforts to obtain right-of-entry from adjacent property owners, Messrs. Cyril Andre and Jim Boylan, for off-site investigation and possible remediation. Perform semiannual ground water sampling of monitoring wells for dissolved hydrocarbons in March/April 1990 as per the MRP provided there is sufficient water in the wells. As of February 19, 1990, all monitoring wells on site are dry. REMEDIAL AC'FION STATUS AND SEMIANNUAL GROUND WATER MONITORING REPORT Davies Oil Company Bakersfield, California Delta Project No. 40-87-326 Page 15 7.0 REMARKS/SIGNATURES The recommendations contained in this report represent our professional opinions, and are based, in part, on information supplied by the client. These opinions are based on currently available information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended. ... DELTA ENVIRONMENTAL CONSULTANTS, INC. This report was prepared by: Sudhakar Talanki Project Engineer/Project Manager Date The work performed in this report was done under the supervision of a California Professional Engineer: /law ~fN. Brennan, P.E. California Registered Professional Engineer #CO41821 Date / -/ ¢ pn'l, 4' II If I I II I '--' ;[ I e Primm-y Schl ]~ '.[. 1: GEHER,~ NOTES: BASE MAP FP, OM U.S.G.S. OR. DALE, CA. 7.5 MINUTE TOPOGSAPHIC QuADRANGLe. LOCATION 0 2000 FT SCALE I: 24.000 · Be~rdsle · /Dr~e-in .,, Theater 13 I SITE ....:,' FIGURE 1 SITE LOCATION MAP DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD, CA. 40-87-32S tH. 511218g S~T 5125189 FRICTION BATTERY SERVICE ACCO CABLE SPt~JNG OPEN SPACE SiORA!E DRIVEWAY UPS BUILDING P/F.F/CE PRIv, RESID~ [ UPS STORAGE AREA GROUND WATER, ~ ' ROW DIRECTION · M'~ STEEL SUPPL¥~. PIPE STORAGE WATER TREATMENT SYSTEM ~O.05(T~ TEAMSTERS RUSH SWOAPE LOCAL UNION PROPERTIES NO.87 TRUCI( WASH ABANOONED BUILDING PRIVATE WELL I KEN CUMMINGS RU6H SWOAPE DIESEL PROPERTIES KERNVI~LE STAGE AND FREIGHT >> OPEN LOT BUILDING JClW-9/ T'~.UC~ PARKING 0.033(B)/~ 'UMP -- STORAGE P-2 P-1 ' INFILTRATION GALLERY BURIED DISCHARGE LINE TO INFILTRATION GALLERY (COVERED SURFACE) TRAI.ER PARK 40-87-326 North LEGEND: . ~) MW-1 &RW-1 XsO YW &P-1 MONITORING WELL LOCATION RECOVERY WELL LOCATION DRY WELL LEAK STAGNATION POINT 112 WIDTH OF CAFTURE AT W~2LL PIEZOMETER O.O05(B) 4(TPH) BENZENE CONCENTRATION IN MARCH 1989 IN PARTS PER MILLION TOTAL PETROLEUM HYDROCARBON 'CONCENTRATION IN MARCH 1989 IN PARTS PER MILLION NOT DETECTED N=ERRED EXTENT OF FREE PR(:N:)UCT PLUM~ INFERRED EXTENT OF ~VED HYDROCARBONS POSSIBLE OLD DESEL PLUME TI-EOflETICAL CAPTURE ZOhE 0 lO0 FT SCALE FIGURE 3 THEORITICAL CAPTURE ZONE FOR RW-1 PUMPING 19 GALLONS PER MINUTE DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD. CA. I SRT 2/27190 IGATE ~,.~'/~///////~ ~/~ INFILTRATION GALLERY (COVERED SURFACE) GRAVEL DRIVEWAY TIRE STORAGE '1 GRAVEL DRIVEWAY KERNV~..LE STAGE ~ FREIGHT LINES 4 IN BURIED WATER DISCHARGE LINE TO INFILTRATION GALLERY (2 FT BELOW GROUND) OVERHEAD ELECTRIC POWER SUPPLY / Wo,4 ~'o ~ ELECTRIC CONTROL PANEL FOR TREATMENT SYSTEM ~ ~TE PAD EXTRA ~ FOR WATER UNLEADED ~.. TREATMENT.. SYSTEM MW-B '--'JWATER TO AIR STRI3PER INt. ET~ ~R /~/ I I ~F~ % / ~ ~11 ' ~ I I TR~ .~' ~~WATER AND PRO.CT PUMP WITH ~ [-~ / '// AUTOMATIC LEVEL CONTROLS INSIDE WELL ,, , I I / ~T ST~A~ ~ /J J./J ~ ~_ Z I ~.~1 ' ' J y e ~'1 ~~ W~L L~T~ [ L-J ' I GR~ EL ~ LEAK MW-2 AIR STRIPPER (AUTOMATIC FLOW CONTROL) PARTICULATE FILTER CARBON FILTERS (2 IN SERIES) DRY WELL · P-1 PEZOMETER NOTE: SITE SURVEYED MAY 2, 1988 0 ,lOFT FIGURE 2 GENERAL LAYOUT OF WATER TREATMENT SYSTEM DAVIES OIL 3305.1/2 GULF STREET BAKERSFELD, CA. 40-87-326 SRT 2~23/90 APPENDIX A Analytical Laboratory Results. 'IIR,,.WATER & HAZARDOUS WASTE LABORATORY (No.9~&151) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analyt/ca~ Services Centra~ Coast Analyt/ca~ Services, Inc. 1~1 Suburban Road Suite C-~ San Luis Obtspo, California 93~1 (8~S) 5~3-255~ Lab Number: G-~16~-1 Collected: el/~/ge Received: e1/12/ge Tested: ~1/1~/9~ Collected by: C. Brandon Poteet Fue! Fingerprint Analysis - EPA Method 824~/826~ (GC/~S) EXTRACTED BY EPA METHOD 5~5~ (purge-and-trap) ATTN: M/ke Westerheim Delta Env/ronmental 553~ Data Drlve Rancho Cordova, CA 95674 SAMPLE DESCRIPTION: Proj,#4~-87-526, Day/es A~r Str/pper In~luent, Water Compound Analyzed Detection L~m[t ~n ppm (pQL)# Concentration ~n ppm Benzene ~.~05 Toluene ~.~5 ~.052 Ethylbenzene ~.~5 not found Xylenes ~.~5 ~.19 1,2-Dichloroethane (EDC) ~.~5 not found Ethylene D~bromlde (EDB) ~.~5 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) ~. 88 BTX as a Percent of Fuel 51. Percent Surrogate Recovery 95. ~(Practical Quant~tatton L~mlt) MSD#7 el -26-91~ G~I 6~fl, wrl/5 MH/,~I/ck/kc Respectt'u[[y subm/tted, CENTRAL COAST ANALYTICAL SERVICES Mary Havl/cek, Ph.D. Pres/dent WATER & HAZARDOUS WASTE LABORATORY (No.g~&131) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES 1 Central Coast Analytical Services Central Coast Analytical Services, Inc. 141 Suburban Road Suite San Luis Obispo, California 934~1 (845) 545-2555 Lob Number: G-~16~-2 Collected: ~1/8~/9~ Received: ~1/12/9~ Tested: ~1/1~/9~ CoZZected by: C. Brandon Poteet Fuel Fingerprint Analysis - EPA Method 82~/826e (GC/~S) EXTRACTED BY EPA METHOD 5~5~ (purge-and-trap) ATTN: Mike Westerheim Dezta EnvironmentaZ 333~ Data Drive Rancho Cordova, CA 95679 SAMPLE DESCRIPTION: Pro~.#~-87-326, Davies 0il, Air Stripper Effluent, Water Compound Analyzed Detect/on Limit Concentration in ppm (pQL)# tn ppm Benzene ~.~1 not found Toluene ~.~1 not found Ethylbenzene ~.~1 not found Xylenes ~.~5 not found 1,2-Dlchloroethone (EDC) ~.~1 not found Ethylene Dlbromlde (EDB) ~.~1 not found TOTAL'PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) <e.~5 BTX as a Percent of Fuel not applicable Percent Surrogate Recovery 12~. *(Practical Ouontltotlon Limit) MSD#7 ~1-26-9e G~16~f2.wrl/5 MH/~l/ck/kc Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Pre$1dont 'tIR,t WATER & HAZARDOUS WASTE LABORATORY (No.g~&131) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coas~ Analytical Services Central Coast Analytical Services, Inc. 1~1 Suburban Road , Suite C-~ San Luis Obispo, California 93~1 (865) 5~3-2553 Lab Number: G-~16~-3 Collected: ~1/E~/9~ Received: ~1/12/9~ Tested: 61/1~/96 Collected by: C. Brandon Poteet Fuel Fingerprint AnaZysis - EPA Method 82~6/8266 (GC/MS) EXTRACTED BY EPA METHOD 5656 (purge-and-trap) ATTN: Mike Westerheim Delta Environmental 5556 Data Drive Rancho Cordova, CA 95676 SAMPLE DESCRIPTION: Proj.#~6-87-$26, Davies Oil, Infiltration Gallery Discharge, Water Compound Analyzed Detection Limit in ppm (PQL)# Concentration in ppm Benzene ¢.~¢~1 not found Toluene ~.~1 not found Ethylbenzene ~.0~1 not found Xylenes ~.~1 not found 1,2-Dlchloroethane (EDC) ~.~1 not found EthyIene Dibromlde (EDB) ~.6~1 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) BTX as o Percent of Fuel not applicable Percent Surrogate Recovery 113.' *(Procticol Ouontitotion Limit) MSI~7 ~1-26-96 G~166f~.wr1/5 MH/~l/ck/kc Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President 1 'I 1 -] .] WATER & HAZARDOUS Central Coast Analytical Services WASTE LABORATORY (No.l$1) CERTIFIED by CALIFORNIA DEPT of HEALTH CentraZ Coast Lab Number: As L~sted~ Analytical Services Collected lql Suburban Road, Suite C-~ Received: )1/121g) ATTN: Mike Westheim Delta Environmental Consultants 333~ Data Drive Rancho Cordova, CA g5674 San LUis Obispo, California 93441 Tested: As Listed ~ -~ .~ t~].'. (845) 545-2555 Collected by= B~ndon Po~ee~ Sample Descrtpt~on: Water Samples as Listed ~ . r.'] ...... -".. . ..., :~-... DIGESTED BY EPA ~ETHOD 3~2~ on by ~. REPORT SAMPLE DESCRIPTION LAB NUMBER TOTAL LEVEL FOUND -LEAD mg/1 EPA METHOD DETECTION LIMIT(PQL)## ..... DATE/ANALYST 7421 41/16/90 AEA Stripper Influent G-~160-2 G-0160-5 Air Stripper Effluent Infiltration Gallery Discharge **Practical Quontitation Limit 41/18/94 G4164-1DL.WR1/5 MH/lf Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES DELTA Sample ~on/Reld~ of CU~m'~ Record ~ .' · ...... . .... . ,,..g~l~'i ~,..~, , .:""~" .,4; {.~ ~...::;Y~-"' -;., .' . . Sealed for shinto ~ (s~namre) :¢Da~'/; ~- ~- ' Received f~ ~b ~ (s~nature) "~.:~ua~::~" · ~ments ' ' IR!, WATER & HAZARDOUS WASTE LABORATORY (No.9~&lS1) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services Central Coast Analytical Services, Inc. 1~1 Suburban Road , Suite C-~ San Luis Obispo, California g3q~l (8e5) 5~3-255~ Lab Number: F-15825 JA~V I 2 l~ Collected: 12/~6/89~. Received: 12/~9/.87~__ :'~J~ Tested: 12/17/~ -~--~--~_~___ .... Collected by: C.B. Po~ee~ Fuel Fingerprint Analysis - EPA Method 82~/826~ (GC/MS) EXTRACTED BY EPA METHOD 5~ (purge-and-trap) ATTN: Mike Westerheim Delta Environmental 333~ Data Drive Rancho Cordova, CA 9567e SAMPLE DESCRIPTION: Davies Oil Co., Delta #~-87-326, Airstripper Znfluent, Water Compound Ano!¥zed Detection L/mit tn ppm (pQL)# Concentration in ppm Benzene ~.~1 ~.034 ToIuene ~.~1 0.~68 Ethylbenzene ~.¢01 ¢.~¢6 XyIenes ~.~01 ~.10 1,2-Dlchloroethone (EDC) ~.~1 not found Ethyiene Dlbromlde (EDB) ~.~1 not found Carbon Tetrachlorlde ~.~1 not found 't TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.1 (GASOLINE) BTX os a Percent of Fuel 29. Percent Surrogate Recovery 94. *(Practical Quontitotion Limit) MSI~7 ~1-e8-9~ F15825f.wr1/19~ MH/~m/ck/rh/kc Respectfully submitted, · CENTRAL COAST ANALYTICAL SERVICES Laurence R. Hilpert, Ph.D. Vice President IIR.~ WATER & HAZARDOUS WASTE LABORATORY (No.g~&131) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES 1 Central Coast Analytical Services Central Coast Analytical Services, Inc, 1&1 Suburban Road , Suite C-~ San Luis Obispo, California 93~1 (8~5) 5~3-2553 Lab Number: F-15826 Collected: 12/~6/89 Received: 12/e9/89 Tested: 12/17/89 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 82~/826~ (GC/~S) EXTRACTED BY EPA METHOD 5~ (purge-and-trap) ATTN: Mike Westerheim Delta Environmental 333~.Data Drive Rancho Cordova, CA 9567~ Compound Analyzed SAMPLE DESCRIPTION: Davies 0il Co., Delta #~-87-326, Infiltration Gallery Discharge, Water Detection L/mit Concentration tn ppm (pQL)# tn ppm Benzene Toluene EthyIbenzene Xylenes 1,2-DlchIoroethone (EDC) Ethylene Dlbromlde (EDB) Carbon Tetrochiorlde ~.~2 not found ~.~1 not found ~.~1 not found ~.~1 not found ~.~2 not found ~.~2 not found ~.~1 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) <~. ~5 BTX os a Percent of Fuel not opplicobie Percent Surrogate Recovery 121. w(ProctlcoI Ouontttotlon Llmit) ~SD~7 e1-~-9~ F15826f. wrl/19~ MH/~m/ck/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Laurence R. Hilpert, Ph.D. Vice President IRt WATER & HAZARDOUS WASTE LABORATORY (No.9~&151) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 333e Data Drive Rancho Cordova, CA 9567~ centraZ Coast Lab Number: F-1~523 Analytical Services, Inc. Collected: 11/~9/89 1~1 Suburban Road , Suite C-~ Received: 11/11/89 San Luis Obtspo, California 93~1 Tested: 11/13/89 (8~5) 5~3-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 82&8/826~ (GC/MS) EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil Co., Delta #~-87-326, Airstripper Influent, Water Compound Analyzed Benzene Toluene Ethylbenzene Xylenes 1,2-Dlchloroethane (EDC) Ethylene Dlbromide (EDB) Detection Limit in ppm (PQL)* Concentration .... tn ppm ~.~26 ~.~64 e.~15 4.13 not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.1 (GASOLINE) BTX as a Percent of Fuel Percent Surrogate Recovery 37. 94. I *(Practical Quontitatlon Limit) ~SD~6 11-27-89 F14523f.wr1/17g MH/ec/jc/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President WATER & HAZARDOUS WASTE LABORATORY (No.g~&151) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coas[ Ana[ytica! Services ATTN: Mike Westerheim DeZta Environmental 333e Data Drive Rancho'Cordova, CA g567~ Centr.. Coast Lab Number: F-1452~ Analytical Services, Inc. Collected: 11/69/89 1~1 Suburban Road , Suite C-~ Received: 11/11/89 San Luis Obispo, California 93~61 Tested: 11/11/89 (865) 5~$-255~ Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 8246/8266 (GC/MS) EXTRACTED BY EPA METHOD 5636 (purge-and-trap) SAMPLE DESCRIPTION: Davies 0il Co., Delta #~6-87-~26, Infiltration Gallery Disc, Water Compound Analyzed Detection Limit in ppm (PQL)# Concentration .... in ppm Benzene ~,~2 not found Toluene ~.~5 not found Ethylbenzene ~.~5 not found Xylenes ~.~5 not found 1,2-Dichloroethone (EDC) ~.~2 not found Ethylene Dlbromlde (EDB) ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS (GASOLINE) <e.~5 BTX as a Percent of Fuel not applicable Percent Surrogate Recovery 1~4. #(Practical Quan~ttatlon L/m/t) ~SD~6 11-16-89 F1~52~f.wr1/176 ~H/tz/jc/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President l IR; WATER & HAZARDOUS WASTE LABORATORY (No.9~&151) CERTIFIED by CALIFORNIA ~~ICES Central Central Coost Lob Num..gr: As L~sted ~OV 3 ~ IOJ~3 ///i Coost AnoZvtico! Services Collected: 11/.9/89 t/I/ Ano[yttcol 1~1Suburbon Rood, Suite C-~ Received: 11/11/e9----~ '~1 Services San Luts Obispo, California g3~,1 Tested: As · (8.5) 5~$-2553 Collected by: C. Brandon ATTN: Hike Westerheim Delta Environmental 333. Data Dr~ve Rancho Cordova, CA 9567. Sample Descript~on: Pro~ect #~.-87-~26 Davies 0il Co., Water Samples As Listed REPORT DIGESTED BY EPA METHOD 3,2, ON 11/16/89 BY SH. LAB NUMBER SAMPLE DESCRIPTION .... LEVEL FOUND EPA METHOD DETECTION LIMIT(PQL)** ..... DATE/ANALYST #**STLC TOTAL LEAD mg/1 7421 11/21/89/KRW 5.0 F-14,525 Airstripper Influent ¢.008 F-14,524 Infiltration Gallery Disc **ProctlcoI Quontttotlon Limit #**SOLUBLE THRESHOLD LIMIT CONCENTRATION os ilsted in 22 CoI Adm Code Art 11 Sec. 66699 os persistent & biooccumuiotive toxic substonce. 11/22/89 Fl~523DL.WR1/#128 · MH/ke Respectfully submitted, CENTRAL COAST AN~ALYTICAL SERVICES ~Y~avl~ c~ President Proje~: 4 · .. · i, ~,' :~&~' . . ,~ ..- ;.';'.: '  ~": : .,. . · ..:.. . r~ Received for ~b b~ (s~na~re) ~nts IR,' WATER & HAZARDOUS WASTE LABORATORY (No.9~&lS1) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services Delta Environmental 333~ Data Drive Rancho Cordova, CA g567~ Central Coast Lob Number: F-133~ Analytical Services, Inc. Collected: 1~/~5/89 1~1 Suburban Road , Suite C-~ Received: 1~/1~/89 San Luis Obispo, California 934~1 Tested: 1~/15/89 (8~5) 5~3-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 82~/826~ (GC/MS) EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil Co., Delta #4~-87-526, Airstripper, Influent, Water Compound Analyzed Detection Limit Concentration in ppm (pQL)# *... in ppm Benzene ~.~2 ~.~11 Toluene ~.~2 >~.~$5' Ethylbenzene ~.~2 ~.~15 Xylenes 0.~02 >~.~80' 1,2-Dlchloroethone (EDC) ~.~2 not found Ethylene Dlbromlde (EDB) ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) ~.55 BTX as a Percent of Fuel >21.# Percent Surrogate Recovery 90. * Saturated; use result from dupIlcote anaiysis, *(Practical Ouantltatton Limit) MSD#7 1~-18-89 F133Q~f.wr1/16~ MH/ji/jc/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES President tR,.-WATER & HAZARDOUS WASTE LABORATORY (Nc.gO&IS1) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services Delta Environmental 333~ Data Drive Rancho Cordova, CA 9567~ Central Coast Lob Number: F-1354~dup Analytical Services, Inc. Collected: 1~/~5/89 141 Suburban Road , Suite C-4 Received: 1~/14/89 Son Luis Obispo, California 934~1 Tested= 1~/15/89 (8~5) 543-2555 Collected by= C,B, Poteet Fuel Fingerprint Analysis - EPA Method 824~/826~ (GC/MS) EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRIPTION= Davies Oil Co,, Delta #4~-87-326, Airstripper, Influent, Water Duplicate Analysis Compound Analyzed Detection Limit in ppm (PQL)# Concentration .... in ppm Benzene ~.~5 Toluene ~.~5 ~.~58 Ethylbenzene ~.~5 ~.~16 Xylenes ~,~05 0,16 1,2-Dlchloroethone (EDC) ~.~5 not found Ethylene D/bromide (EDB) ~.~5 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) BTX as a Percent of Fuel Percent Surrogate Recovery 98, *(Practical Ouantltotlon Limit) '~ MSD~7 1 ~-18-89 F1334~fd. wrl/16~ MH/~l/jc/rh Respectfully submitted, 'CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President IR'; WATER & HAZARDOUS WASTE LABORATORY (No.g~&151) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES I Central Coast. Analytical Services Delta Environmental 333~ Data Drive Rancho Cordova, CA 9567~ Central Coast Lob Number: .F-1~3~1 Analytical Services, Inc. Collected: 1~/~5/89 1~1 Suburban Road , Suite C-~ Received: 1~/1~/89 San Luis Ob/spa, California 93~1 Tested: 1~/15189 (8~5) 5~5-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 82~e/826~ (GC/MS) EXTRACTED BY EPA METHOD 5~5~ (purge-and-trap) S/URPLE DESCRIPTION: Davies 0il Co., Delta #~-87-526, Airstripper, Effluent, Water Compound Analyzed' Detection Limit Concentration -.... tn ppm tn ppm (pQL)# Benzene ~.~02 not found Toluene 0.~2 not found Ethylbenzene ~.~2 not found Xylenes ~.~02 not found 1,2-01chioroethane (EDC) ~.~2 not found Ethyiene Dlbromide (EDB) ~.~02 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) BTX os a Percent of Fuei not oppllcobie Percent Surrogote Recovery 1~4. #(Proctlco! Ouontltotlon Llmlt) MSD~7 1~-18-89 F133~1f.~r1/16~ MHIjmljclrh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havltcek, Ph.D. President ~IR', WATER & HAZARDOUS WASTE LABORATORY (No.g~&151) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Ana[yt~ca! Services Central Coast Analytical Services 141 Suburban Road, Suite San Luis Obispo, California 934~1 (8~5) 5~$-2553 Lob Number: F-1~,$42 Collected: 1~[~5/89 · 1~5~ Received: 1~/14/89 · ~93~ Tested: As L/sted Collected by: C. Brandon Poteet ATTN: Mike Westerheim Delta Environmental 333e Data Drive Rancho Cordova, CA g567~ Sample Description: Davies 0t1 Co., 4~-87-526 MW-I~, Monitoring Water CONSTITUENT REPORT EPA METHOD/DATE/ANALYST DIGESTED BY EPA METHOD 3E2~ ON 1~/17/89 BY AEA. DETECTION LIMIT mg/1 (pQL)## TOTAL LEVEL FOUND ###STLC mg/1 mg/1 LEAD 7421 1~/18/89 KRW ~.~05 ##Proctlcol Quontltotlon Limit ###SOLUBLE THRESHOLD LIMIT CONCENTRATION os listed in 22 Col Adm Code Art 11 Sec. 88899 os persistent & blooccumulotlve toxic substonce. 1~/18/89 F13342DL.WR1/#113 MH/ke Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Ph. D., DELTA Sample Identification/Field Chain of Custody Record ENVIRONHENTAL CONSULTANTS, INC. Shipped tO: -- ~'(~- ~' - ' Attention of: ~ Comments: "7~-"[~' ~'~-'~ ~ ~ ~ ~[~ ~~~[ ~ Hazardous ~terials sus~? (yes/no) ~ ~ No. of P~ ~ ~ ID ~ Da~ ~ ~~ R~ ~-L~o Samp~s) (~mre) ~ ~_ ~a~forship~ntby:(s~nature) . _.~ ~ -.. ~ - . Date~i~ ~'~ ~ ~;~ Shi~entmeth~: _ . .~v~ ~or ~ ~: (~gna~u~)_ ~ D~m~ 10-~ 0~ Co~.~s ............. Rdeiving ~mto~: PI;as; r;tum o.gi~al fo~ a~er si~ning }~ ~eipt of ~mp~,. l .AIR', WATER & HAZARDOUS WASTE LABORATORY (No.91~&131) CERTIFIED by CALIFORNIA ! -1 CentraZ Coast AnaZyt~caZ Services ATTN: Mike Westerheim Delta Environmenta! 333~ Data Drive Rancho Cordova, CA 95676 CentraZ Coast Lab Number: F-11~ AnaZytica! Services, Inc. CoZlected: 68/21 1~1 Suburban Road , Suite C-~ Received: 68/3~ San Luis Obispo, California 95~61 Tested: 69/61/89 (865) 5~3-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 8266 EXTRACTED BY EPA METHOD 5636 (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil Co., Delta #~6-87-326, Fed #83Z-9 RW-1, Airstripper Influent, Water Compound Analyzed Benzene Toluene Ethylbenzene Xylenes 1,2-Dlchloroethane (EDC) Ethylene Dlbromide (EDB) Carbon Tetrachloride Detection Limit in ppm (PQL)# ..Concentration .... in ppm e.e6 ~.51 e.~6 ~.75 not found not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS 1. (GASOLINE) BTX as a Percent of Fuel 57. Percent Surrogate Recovery 112. *(Practical Ouantitotion Limit) MSD#6 69-6~-89 F11355f.wr1/138 MH/jg/ck/rh Respectfuily submitted, CENTRAL COAST ANALYTICAL SERVICES ~Ph.D. President '~LI~, WATER & HAZARDOUS WASTE LABORATORY (No.gg&151) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICE~ ] 1 I Central Coast Analytical Services ATTN: Mike Westerheim DeZta EnvironmentaZ 555~ Data Drive Rancho Cordova, CA 95676 Central Coast Lab Number: F-11355dup Analytical Services, Inc. CoZlected: 98/24/89 141 Suburban Road , Suite C-~ Received: 98/31/89 Son Luis Obispo, California 93491 Tested: ~9/61/89 (895) 5~3-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysts - EPA Method 8266 EXTRACTED BY EPA METHOD 593~ (purge-and-trap) SAMPLE DESCRIPTION: Davies 0il Co., Delta #4~-87-326, Fed #83Z-9 RW-1, Airstripper InfZuent, Water Duplicate Analysis l Compound Analyzed Benzene Toluene Ethylbenzene Xylenes 1,2-Dlchloroethane (EDC) E~hylene Dlbrom/de (EDB) Carbon Tetrachloride Detection Limit ..~once~tration ... in ppm tn ppm (pQL)# 9.956 9.29 9.962 not found not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS (GASOLINE) BTX os a Percent of Fuel 35. Percent Surrogate Recovery 119. *(PracttcaI Quant/tat/on Llmlt) MSD#6 69-6~-8g F11355fd.wrl/138 mH/bZ/ck/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President I '" !! ;"~ J ," :: :' ~" ~'~'~'"q'" ' ' ii, !'', Central central Coast Lab Number: F-~'~-~ i Coa,t Ano~vt~caZ Services CoZZec~ed= Ano~y~$ca~ 1~1 Subu~bon Ro~d, Suite Services S~n Lugs Ob~spo, C~ocn~ 93~1 Tested= As (8~5) 5~3-2553 Co~ec~ed by= C. B~ndon Po~ee~ ATTN: Mike Westerheim Delta Environmenta! 333~ Data Drive Rancho Cordova, CA 9567~ Sample Description: Project #4~-87-326, F#83z-g Davies Oil Co., RW-1Airstripper Influent ~82~8916~, Wastewater CONSTITUENT REPORT EPA METHOD/DATE/ANALYST DIGESTED BY EPA METHOD ON ~9/11/8g By..SH. TOTAL DETECTION LIMIT LEVEL FOUND mg/1 (PQL)"# mg/1 LEAD 7~21 09/12/89 RJ #*Practlcai Ouantitotlon Limit F11355DL.WR1/#1e~ MH/ke Respectfully submitted, · . .'. .... .,, ~:., .... '--.- ., ..[~t'~'~'.-~'~;f,':?: .... : .... ' .- . ::. · Sample kJenflfi~tion/Fi~:,~.Chain of Custody Record DELTA ~VIRONMENT.AI-.CONSULT^NTS, INC. Project: Shipped by: Shipped to: Comments: ' i;ampler(s) (signature) I. et i Attention of: ~) ~ UT ~ ~ Hazardous materials suspected? (yegJ'l~) Shipment method: Comments ' Receh4ng LM)matoq:. Pleile retum odglna'*l fern1 liter Ilgnlng for receipt of tamplet. ;ealed for shipment by: (signature) [eceived for Lab by:. (signature) ]IR/; WATER & HAZARDOUS WASTE LABORATORY (No.g~&151) CERTIFIED by CALIFORNIA DEPT Of HEALTH SERVICES Central Coas~ Analytical Services Delta Environmental 333~ Data Drive Rancho Cordova, CA Central Coast Lob Number: F-13342 Analytical Services, Inc. Collected: 1~/~5/89 141 Suburban Rood , Suite C-~ Received: 1~/14/89 Son Luis Obispo, California 934~1 Tested: 1~/15/89 (8~5) 543-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 824~/826~ (GC/MS) EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oi! Co., Delta #4~-87-326, 9567~ I~/-1~, Water Compound Analyzed Benzene Carbon Tetrachlorlde Toluene Ethylbenzene Xylenes 1,2-DlchIoroethane (EDC) Ethylene Dlbromide (EDB) Detection Limit in ppm (PQL)# Concentration .... in ppm ~.~2 not found ~.~2 not found ~.~2 not found ~.~02 not found ~.~02 not found ~.~2 not found ~.~2 not found TOTAL PURGEABLE PETROLEUH HYDROCARBONS ~.~5 (GASOLINE) <~.~5 BTX os a Percent of Fuel not oppllcabIe Percent Surrogate Recovery 97. #(Practical Ouontltatlon Limit) MSD~7 1 ~-18-89 F155~2f.wr1/16~ MH/jm/jc/rh Respectfully submitted, CENT~L~OAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President APPENDIX B Ground Water System Monitoring :IES) - INFiLTRAT!OH DISCHARSE N ~J.RAH!REZ 90 I 02/19/90 19: 15 O0 I 9002400 :l l m~ ,1 SYSTEM SHUT DOWN.UNAI)ALE TO OPERATE AT: THIS LOW IATE~ Cg,'t~ I TiO~I MONTHLY REPORT JANUARY 1990 AlE: EMISSIONS AND OPERATION DATA GROUND WATER TREATMENT SYSTEM DAVIES OIL COMPANY, BAKERSFIELD,CA DELTA PROJECT N0.40-87-326 i RECOF.:DED BY BRANDON POTEET SITE VISIT DATE JANUARY 3, AND 4,.1990 PUMPING RATE (RECOVERY WELL RW-1) (GALLONS PER'MINUTE)- FLOWMETEF.: READING(GALLONS) (JANUARY 4) APF'ROX. CUMULATIVE FREE PRODUCT RECOVERED (GALLONS) INFLEUNT SAMPLING POINT 19 6920100 57 RW-1 AIR STRIPPER INFLUENT SAMPLING RESULTS(JANUARY 4) (LABORATORY ANALYSIS ATTACHED) BENZENE(PARTS PER MILLION)(PPM) TOTAL PETROLEUM HYDROCARBONS(TPH)(PPM) TOTAL LEAD(PPM) AIR STRIPPER EFFLUENT SAMPLING ~ESULTS(JANUARY4) BENZENE(PARTS PER MILLION)(PPM) TOTA~ PETROLEUM HYDROCARBONS(TPH)(PPM) TOTAL LEAD(PPM) O. 03 O. 88 < 0.005 NOT FOUND < 0.05 < O. 005 AVEE'.AGE BENZENE EMISSIONS(LBS/DAY) (EXAMPLE CALCULATIONS ATTACHED) AVERAGE BENZENE EMISSIONS(LBS/DAY). ALLOWED BY AIR PERMIT" '~" AVERAGE TPH EMISSIONS(LBS/DAY) AVERAGE TF'H EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT '0.03 0.30 75.75 CHECK AIF.:FLOW RATE THROUGH AlE: STRIF'F'ER RECOF.:D CONDITION YES/NO YES OK CHEF:K AIR STRIF'F'EF.: PACKING YES/NO~ RECORD C:ONDITION EFFLUENT SAMF'LING F'OINT YES OK PRIOR TO INFILTRATION DISCHARGE EFFLUENT SAMPLING RESULTS (JANUARY 4) (LABORATORY ANALYSIS ATTACHED) BENZENE (PF'M) TF'H (F'F'M) TOTAL LEAD (F'PM) NOT FOUND < O. 05 < ¢). 005 MONTHLY REPORT DECEMBER 1989 AIR EMISSIONS AND OPERATION DATA GROUND WATER TREATMENT SYSTEM !'AVIES OIL COMPANY, BAKERSFIELD,CA DELTA PROJECT N0.40-87-326 RECORDED BY BRANDON POTEET SITE VISIT DATE DECEMBER 6,1989 PUMPING RATE (RECOVERY WELL RW-1) (GALLONS PER MINUTE) FLOWMETER READING (GALLONS) (DECEMBER 8) APPROX. CUMULATIVE FREE PRODUCT RECOVERED (GALLONS)~ INFLEUNT SAMPLING POINT AIR STRIPPER INFLUENT SAMPLING RESULTS(DECEMBER 6) (LABORATORY ANALYSIS ATTACHED) BENZENE(PARTS PER MILLION)(PPM) TOTAL PETROLEUM HYDROCARBONS(TPH)(PPM) TOTAL LEAD(PPM) AVERAGE BENZENE EMISSIONS(LBS/DAY) (EXAMPLE CALCULATIONS ATTACHED) AVERAGE BENZENE EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT AVERAGE TF'H EMISSIONS(LBS/DAY) (EXAMPLE CALCULATIONS ATTACHED) AVERAGE TPH EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT CHECK AIRFLOW RATE THROUGH AIR STRIPPER RECORD CONDITION YES/NO CHECK AIR STRIPPER PACKING YES/NO RECORD CONDITION EFFLUENT SAMF'LING POINT EFFLUENT SAMF'LING RESULTS (DECEMBER 6) (LABORATORY ANALYSIS ATTACHED) BENZENE(PF'M) TPH(PPM) TOTAL LEAD(PF'M) '-28 6 (') 378 (')0 57 RW-1 0.03 0.70 NOT ANALYZED 0.010 1.84 0.23 75.75 YES OK YES OK PRIOR TO INFILTRATION DISCHARGE NOT FOUND <(i).¢)5 NOT ANALYZED MONTHLY REPORT NOVEMBER 1989 AIR EMISSIONS AND OPERATION DATA GROUND WATER TREATMENT SYSTEM DAVIES OIL COMPANY, BAKERSFIELD, CA DELTA PROJECT N0.40-87-326 RECORDED BY SITE VISIT DATE FLOWMETER READING(GALLONS) (NOVEMBER 8) APPROX. CUMULATIVE FREE PRODUCT RECOVERED (GALLONS) INFLEUNT'SAMPLING POINT AIR STRIPPER INFLUENT SAMPLING RESULTS(NOVEMBER 9) (LABORATORY ANALYSIS ATTACHED) BRANDON POTEET NOVEMBER 8 and 9,1989 PUMPING RATE (RECOVERY WELL RW-1) (GALLONS PER MINUTE)' BENZENE(PARTS PER MILLION)(PPM) TOTAL PETROLEUM HYDROCARBONS(TPH)(PPM) TOTAL LEAD(PPM) AVERAGE BENZENE EMISSIONS(LBS/DAY) (EXAMPLE CALCULATIONS ATTACHED) AVERAGE BENZENE EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT AVERAGE TPH EMISSIONS(LBS/DAY) (EXAMPLE CALCULATIONS ATTACHED) !. AVERAGE TPH EMISSIONS(LBS/DAY) ALLOWED BY ] AIR PERMIT CHECK AIRFLOW RATE THROUGH AIR STRIF'F'ER YES/NO RECORD CONDITION CHECK AlE: STRIPPER PACKING YES/NO RECORD CONDITION EFFLUENT 'SAMF'LING POINT ~ RESULTS (NOVEMBER 9) EFFLUENT SAMF'LINb (LABORATORY ANALYSIS ATTAC:HED) BENZENE(PF'M) TPH(F'F'M) ~.]'"-,.'.. :._'~,.~: ~ 35 4738300 57 RW-1 0.03 0.80 0.008 0.01 c) .1,84 O. 34 75.75 YES OK YES OK PRIOR TO INFILTRATION DISCHARGE NOT FOUND < 0.05 RECORDED BY OCTOBER ~ MONTHLY REPORT.~III~1989 AIR EMISSIONS AND OPERATION DATA s~ROUND WATER TREATMENT SYSTEM DAVIES OIL COMPANY, BAKERSFIELD,CA DELTA PROJECT'NO.40-87-326 BRANDON POTEET SITE VISIT DATE OCTOBER 5, 1989 "l PUMPING RATE (RECOVERY WELL RW-1) (GALLONS PER MINUTE) · FLOWMETER READING(GALLONS) ~ APPROX. CUMULATIVE-FREE PRODUCT.RECOVERED (GALLONS) SAMPLING POINT AIR STRIPPER INFLUENT SAMPLING RESULTS (LABORATORY ANALYSIS ATTACHED) BENZENE(PARTS PER MZLLION)(PPM) TOTAL PETROLEUM HYDROCARBONS(TPH)(PPM) AVERAGE BENZENE EMISSION8(LBS/DAY) (EXAMPLE CALCULATIONS ATTACHED) AVERAGE BENZENE EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT AVERAGE TPH EMISSIONS(LBS/DAY) (EXAMPLE CALCULATIONS ATTACHED) AVERAGE TPH EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT cHECK AIRFLOW RATE THROUGH AIR STRIPPER RECORD CONDITION CHECK AIR STRIPPER PACKING YES/NO RECORD CONDITION ~' YES/NO ' EFFLUENT SAMPLING POINT EFFLUENT SAMPLING RESULTS (LABORATORY ANALYSIS ATTACHED) BENZENE(PPM> TPH(PPM) 35 3202800 RW-1 0.01 O. 50 1.84 O, 20 75.75 YES OK YES OK PRIOR TO INFILTRATION DISCHARGE NOT FOUND <0.05 MONTHLY REPORT AUGUST 1989 AIR EMISSIONS AND OPERATION DATA GROUND WATER TREATMENT SYSTEM DAVIES OIL COMPANY, BAKERSFIELD,CA DELTA PROJECT NO. 40-87-326 RECORDED BY BRANDON POTEET SITE VISIT DATE AUGUST 24, 1989 PUMPING RATE (RECOVERY WELL RW-1) i (GALLONS PER MINUTE) FLOWMETER READING(GALLONS) APPROX. CUMULATIVE FREE PRODUCT RECOVERED (GALLONS) SAMPLING POINT AIR STRIPPER INFLUENT SAMPLING RESULTS (L~BORATORY ANALYSIS ATTACHED) BENZENE(PART~ PER MILLION)(PPM) TOTAL PETROLEUM HYDROCARBONS(TPH)(PPM) AVERAGE BENZENE EMISSIONS(LBS/DAY) (CALCULATIONS ATTACHED) AVERAGE BENZENE EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT AVERAGE TPH EMISSIONS(LBS/DAY) (CALCULATIONS ATTACHED) AVERAGE TPH EMISSIONS(LBS/DAY) ALLOWED BY AIR PERMIT CHECK AIRFLOW RATE THROUGH AIR STRIPPER YES/NO RECORD CONDITION CHECK AIR STRIPPER PACKING YES/NO RECORD CONDITION E~FLUENT SA~F%ING POINT EFFLUENT SAMPLING REsuLTS 35 17 89200 40 RW-I O. 06 3. O0 0.03 1.84 1 · 30 75.75 YES OK YES OK P~:IOR TO INFILTRATION DISCHARGE NOT AVAILABLE APPENDIX C Theoretical Capture Zone Calculations for Recovery We~lJ. RW-1 Delta Environmental Consultants, Inc. 11030 White Rock Road, Suite 110 Rancho Cordova, CA 95670 916 638-2085 PROJECTNO. ~//0 -8'?---~-~.SHEET / OF / PROJECT NAME p ~ t//~-~ . ~'~ t~'/z/ ,~"~.-<~ F/EL ~ BY ~ DATE ~/~/~ SUBJECT ~~ ~O~ ~ ~LSU~ 'r~ ~/~ Fo~ ~-I CHECKED BY DATE No. '" Tise D3'a~Jovu (&iDs) (ft) *I 0.~ 2.10 2 1.2~ 2.9 3 1.ET 2. f~ 4 2.15 2. % (Bins) (ft) 4.9~' 3.25. G.20 3.27 13.03 3.4O 28.48 4°O2 COMPUTER ANALYSIS BY: ILLINOIS STATE WATER SURVEY SOFTWARE AQUIFER TEST CONDUCTED MAY 3, 1988 ~TII'IAITI) HYDI~)G~Ot. DGIC Tra~saissi~dty ~T) = /1000 gpd/ft Storage Coefficient C$) · 6.6E-02 AD efta Er~ronmental Consultants. Inc, RW.1 THEIS ANALYSIS CURVE 3305 1/2 GULF STREET BAKERSFIELD, CA. JOB NO. 40-87-326 2 T~a~s~issivit~t (1 : 12099 Sto~ge Coefficient CS) -- / Co.el~tion Coefficient (R) = 6,969~ 16e+9 19e+l DATA SET LISTIN6 RW-1 50 gpo r = 0.50 f~t KO, Tiff ~a~l~m Cains) (ft) I '0,7~ 2,10. 2 '*--1,15 -"2..~ 3' '. 1.57 2..8G ' $ 2.~ 3.11 ~ 3.53 · 3. lB Log Tiae Ko. Ti~ Cains) *'.. 7 '4.9~ -: ' ~ 13.03 10 I1 51.~ indicates the. data point vas nzclnded fTO~ .rt~usioe calculatims TfB~TIO~ K~U~Y (ft) 3.~ ,3.~ 4.~ 4.~ COMPUTER ANALYSIS BY: IllINOIS STATE WATER SURVEY SOFTWARE AQUIFER TEST CONDUCTED MAY 3. 1988 Itet tin. t used lain T S 1 0.78 0.348 11~2~ 5. I1E-02 KrGI~;SION S1Jlm~Y Slope Ca) z 1.115 feet/cycle Y-intercept (b) · 2,4~ feet C~rrelatio~ ~)efficie~t Ct) * 0.9695 £STI~TE]) HY~OGEIA~GIC PARAI~'I'~ Transaissivity CT) = 12000 gpd/ft Coefficient (S) : &.IE-02 jkDelta Environmental Consultants, Inc. RW.1 JACOB ANALYSIS DATA 3305 1/2 GULF STREET BAKERSFIELD, CA. JOB NO. 40-87-326 CHK BY./~/~;/,,,j APPENDIX D Right-of-Entry Correspondence Delta Environmental Consultants, Inc. 3330 Data Drive Rancho Coraova. CA 95670 916/638-2085 FAX: 916/638-8385 November 29, 1989 Mr. Cyril Andre Alice Andre Testamentary Trust 3616 I. acosta Avenue Bakersfield, California 93306 Subject: Right-of-Entry Agreement Davies Oil Company, 3305 1/2 Guff Street, Bakersfield, California Delta Project No. 40-87-326 Dear Mr. Andre: Pursuant to our meeting on Wednesday, November 27, 1989, this letter outlines the right.of-entry procedures that we agreed to during the meeting. This letter supercedes the right-of-entry letter dated August 2, 1989. The work will be conducted at your site in three phases, each phase will be conducted under a separate right-of-entry agreement. The Etrst phase which will be conducted under this agreement consists of a soil vapor survey. The soil vapor survey will be used as a screening tool to choose monitoring well locations. You will be issued a report with the results of the soil vapor survey and also the proposed monitoring well locations. As we discussed, up to 40 vapor points may be placed on and around your property. The resulting holes in the asphalt from the soil vapor survey will be patched according to the proposal by Kern Asphalt Company using a hot asphalt mix to guard against moisture seepage. Phase two of the investigation will consist of monitoring well installation and ground water sampling. We anticipate that at least three monitoring wells will be proposed and installed. The ground water will be sampled from the monitoring wells and a report will be issued detailing the results of the monitoring well installation and ground water sampling. A final remedial action plan will be developed based on the ground water data and this plan will be included in the report. The remedial action plan will describe locations of additional recovery wells and associated trenching for water piping and electrical conduit. Phase three will consist of recovery well installation and all required plumbing and electrical work. The proposed recovery well will have to be connected to the existing water treatment system. This connection may require trenching across your property, however, an alternative would be to hang plumbing and electrical work on ex/sting fences. Mr. Cyril Andre Page 2 November 29, 1989 After each phase of work a new right-of-entry agreement will be drafted for your approval. You will be consulted regarding the exact locations and schedule of all work to be completed prior to approving phase two and phase three work. I anticipate that the first phase of work (the soil vapor survey) will be conducted during a three day period in early January 1990. We will notify you at least two days in advance of the impending work. If this plan is acceptable, please sign and return the right-of-entry agreement to me. If you have any questions concerning this project, plea.se contact me at (916) 638-2085 and I will be happy to answer them for you. --- Sincerely, DELTA ENVIRONMENTAL CONSULTANTS, INC. Michael M. Westerheim, P.E. Project Engineer Mr. Jong Han, California Regional Water Quality Control Board Mr. Bill Davies, Davies Oil Company Mr. Steve Fraser, Kinder & Wueffel Mr. Steve Boyle, Clifford, Jenkins & Brown Delta Environmental Consultants, Inc. 3330 Data Drive Rancho. Cordova, CA 95670 916/638-2085 FAX:916/638-8385 August 2, 1989 Mr. Cyril Andre 3616 La Costa Bakersfield, California Subject: Proposed Monitoring Well Installation Ground Water Remediation Davies Oil Company, Bakersfield, California Delta Project No. 40-87-326 Dear Mr. Andre: The purpose of this letter is to request your permission, in writing, to gain access to your property located at 3624 Pierce Road in Bakersfield, California. The property access is required to conduct a ground water assessment and remediation program, as mandated by the Central Valley Regional Water Quality Control Board (Regional Board). The remediation is required to'clean up a leak of approximately 2,500 gallons of gasoline from an underground gasoline pipe line on Davies Oil Company property located directly north of your property. The gasoline leak occurred between October 1985 and March 1986, and the resulting free product plume has been investigated and monitored since June 1986. Delta Environmental Consultants, Inc. (Delta), is acting as a technical consultant on behalf of Davies Oil Company to monitor and remediate the gasoline plume. Enclosed is the latest Semiannual Grou~u~ Water Monitorbtg and Proposed,4dch'tional Work Report which summarizes all ground water information available for the site to date and also presents an interpretation of the loCation of the free gasoline product plume. Figure 5 of the enclosed report is an illustration showing the inferred location of the free product plume. This interpretation is based upon 3 years of data collected from existing wells located on Davies Oil Company property. The exact downgradient extent of the plume is estimated, and additional monitoring wells are necessary to determine the exact location of the plume and to help evaluate the effectiveness of pumping recovery well RW-1. Current Ground Water Remediation Program Currently, recovery well RW-1 is being used to pump ground water and free gasoline product from the aquifer. The ground water is processed in the on-site treatment system loCated at the southwest corner of Davies Oil Company property. The treated ground water is then returned to the aquifer through the infiltration gallery located at the northeast corner of Davies Oil Company property. Active ground water remediation and free product recovery began at this site on June 29, 1989. Practical Solutions to Environmental Concerns Mr. Cyril Andre August 2, 1989 Page 2 Since it has been over 3 years since the leak occurred, the free product plume has likely migrated a considerable distance away from recovery well RW-1 and may be out of the capture zone of recovery well RW-1. Additional recovery wells may have to be installed downgradient on your property to recover the entire plume of free product. However, evaluation of additional remedial measures can only be made after the proposed monitoring wells are installed and the data collected from these wells is evaluated. Proposed' Mo'nitoring Wells The locations of proposed additional monitoring wells are indicated on the enclosed figure. We propose to install monitoring well MW-13 on your property. These locations are approximate, and the exact location can only be chosen after all underground utilities have been located. Delta will also work with you to'ensure that the well will be placed in a location that will not interfere with any future development on your property. We will schedule a meeting at the site to pick a mutually agreeable well location and also discuss the well completion procedure. The well may be completed flush grade with a manhole cover or above grade with a locking standpipe. Enclosed is a copy of the proposed well specifications. We will discuss these specifications with you during our on-site meeting. After completion of the well, the site will be cleaned and restored to its condition prior to entry. Delta will need to check the monitoring well periodically to measure ground water elevations and collect ground water samples for chemical analyses. Ground water elevation measurements will be conducted monthly and ground water samples will be collected semiannually. You will be supplied with copies of all reports describing any measurements or monitoring conducted at this site. Delta is working closely with Jong Hah of the Regional Board. Jong has indicated that he has spoken with you over the telephone regarding the monitoring well installation, and Jong relayed your concerns regarding damage to your property and also your input regarding the actual location of the well. Delta and Davies Oil Company are willing to work closely with you to remove the free gasoline product from the water table beneath your site, and to minimize the inconvenience this may cause you. Enclosed is a right-of-entry agreement that will allow Delta permission to install the monitoring well, and to periodically check the monitoring well. The right-of-entry also binds Delta to restore the site to its original condition. Delta would appreciate your consideration in signing the enclosed document and forwarding it to us. If you wish, Delta can supply you with a certificate of insurance and our drilling contractors certificate of insurance, once one is chosen. Mr. Cyril Andre August 2, 1989 Page 3 If you have any questions regarding this matter or desire further information, do not hesitate to contact me at (916) 638-2085. Sincerely, DELTA ENVIRONMENTAI. CONSULTANTS][NC. Michael M. Westerheim Project Engineer MMW:Iaw Enclosures: Right-of-EntEr Monitoring Well Construction Details Proposed Well Locations Semiannual Ground Water Monitoring and Proposed Additional Work Report cc/enc: Mr. Jong Han, Cental Valley Regional Water Quality Control Board Mr. Bill Davies, Davies Oil Company Ms. Amy Green, Kern County Health Department Mr. Stephen Boyle, Clifford, Jenkins, and Brown (Registered Mail - Return Receipt Requested). RIGHT OF ENTRY (the "License") The property owner(s) (referred to in this Agreement as the "Owner(s)"), have the sole right to the property for which right of entry is granted. The property is located at: 3624 Pierce Road Bakersfield, California The Owner(s) give Davi es 0i 1 Company (the"Licensee"), its agents, employees, and assigns, the right to enter upon the property to instal 1 moni~;or.ino wel]s and and samnle oround water to do all activities required to complete their work. The Owner(s) and the Licensee a~nowl~dge that Delta Environmental Consultants, Inc. ("Delta") is an agent of the Licensee. This License is effective immediately upon signing. Licensee agrees to repair any damage to the property resulting from entry onto the property by Licensee, its agents, employees, or assigns by restoring the property, as much as reasonably possible, to its condition immediately prior to the e.ntry. Dated this day of , 1989. 'Owner(s)' "Licensee" Davies Oil Signature Cyri 1 Andre Typed Name Signature Typed Name By;, Company Typed Name of Licensee Signature Bill Davies Typed Name Title MONITORING WELL CONSTRUCTION DETAILS L1 Project: . .3.3.0..5.,}...G.u.'I..f'..S..t.r.e..e.t. ................................. Delta No:...4,0.~,8.7.-..3.2.6. ............ Ground Elevation: .... ~/0.8 ................ Top Of Riser Pipe Elevation: ........................ Static Water Level: ..R.a..ng.e.. !.5.=.2.5...~.e.e..t.. Installation COml~leted: Date: .............. Time: .................. LOCKING PROTECTIVE CASING - DIAMETER AND MATERIAL · TOTAL LENGTH - LENGTH ABOVE GROUND '- SPECIAL KEYS OR LOCKS REQUIRED ... . RISER PII~. - DIAMETER AND MATERIAL - JOINT TYPE GROUT SEAL -TYPE OF GROUT AROUND RISER -GROUT SEAL THICKNESS BENTONITE SF_~ - TYPE OF BENTOI~I'E - BF.N~OfaTE SEAL THICKNESS FILTER PACK - DISTANCE OF FILTER SAND ABOVE TOP OF SCREEN - TYPE OF FILTER AROUND SCREEN 6-inch steel 5.0 feet 2.5 feet Yes 2-inch PVC Flush-threaded Neat cement g.O feet Pellets 2.0 feet 1.0 foot #3 Monterey sand PVC slotted 0.030 2 inch X 20 feet WELL SCREEN - SCREEN MATERIAL - SCREEN GAUGE OR SLOT SIZE OF OPENINGS - DIAMETER AND LENGTH OF SCREEN L DEPTH TO BOTTOM OF MONITORING WELL FROM TOP OF RISER PIPE TOTAL BORING OI~PTH DIAMETER OF BORE HOLE L 1 =- ......... .2.:.0.. FT L2 =,. ........ .1.2....0.. FT L3 =. ........ .2.0.:.0.. FT L 4 ". ........ .3.2.:.0.. FT DRILLING METHOD COMPLETED BY: .............................. REVIEWED BY: ................................ TOTAL WELL DEPTH BELOW TOP OF RISER PIPE - . ............. FT 34.0 32.0 8 inch Hollow Stem Auger ADelta Env~onmental Consultants, InC. A-1 DRIVE WAY North ~ .RW- 1 ~ MW-14 0.0OS(B) 4(TPH) MONITORING WELL LOCATION RECOVERY WELL LOCATION DRY WELL LEAK PROPOSED MONITORING WELL LOCATION BENZENE CONCENTRATION IN PARTS PER MILLION TOTAL PETROLEUM HYDRO- CARBON CONCENTRATION ~1 PARTS PER MILLION ~FEP. qED EXTENT OF FREE PROOUCT PLt,~4E ~J~ED EXTENT OF DISSOLVED HYDROCARBONS POSSIBLE OLD DIESEL PLUME 0 100 FT SCALE Delta Environmental Consultants, Inc. PROPOSED MONITORING WELL LOCATIONS AND IRFERRED HYDROCARBON PLUME MIGRATION MARCH 13, 1989 3305 1/2 GULf; STREET BAKERSFIELD, CA. BY: JOB NO. 40-87-326 /~//;:,~../ 5" :' ! -] I i 1 1 i Delta Environmental Consultants, inc. 3330 Data Drive Ranct~o Corclova. CA 95670 916/638-2085 FAX:916i638-8385 November 29, 1989 Mr. Jim Boylan Jim's Supply Company, Inc. 3530 Pierce Road Bakersfield, California 93308 Subject: Right-of-Entry Agreement Davies Oil Company, 3305 1/2 Ouff Street, Bakersfield, California Delta Project No. 40-87-326 Dear Ma'. Boylan: Pursuant to our meeting on Wednesday, November 27, 1989, this letter outlines the right-of-entry procedures that we agreed to during the meeting. This letter'supercedes the right-of-entry letter dated August 2, 1989. The work will be conducted at your site in three phases, each phase will be conducted under a separate right-of-entry agreement. The first phase which will be conducted under this agreement consists of a soil vapor survey. The soil vapor survey will be used as a screening tool to choose monitoring well locations. You will be issued a report with the results of the soil vapor survey and also the proposed monitoring well locations. As we discussed, up to 40 vapor points may be placed on and around your property. The resulting holes in the asphalt from the soil vapor survey will be patched according to the proposal by Kern Asphalt Company using a hot asphalt mix to guard against moisture seepage. Phase two of the investigation will consist of monitoring well installation and ground water sampling. We anticipate that at least three monitoring wells will be proposed and installed. The ground water will be sampled from the monitoring wells and a report will be issued detailing the results of the monitoring well installation and ground water sampling. A final remedial action plan will be developed based on the ground water data and this plan will be included in the report. The remedial action plan will describe locations of additional recovery wells and associated trenching for water piping and electrical conduit. Phase three will consist of recovery well installation and all required plumbing and electrical work. The proposed recovery well will have to be connected to the existing water treatment system. This connection may require trenching across your property, however, an alternative would be to hang plumbing and electrical work on existing fences. Mr. Jim Boylan Page 2 November 29, 1989 After each phase of work a new right-of-entry agreement will be drafted for your approval. You will be consulted regarding the exact locations and schedule of all work to be completed prior to approving phase two and phase three work. I anticipate that the first phase of work (the soil vapor survey) will be conducted during a three day period in early January 1990. We will notify you at least two days in advance of the impending work. If you have any questions concerning this project, please contact me at (916) 638-2085 and I will be happy to answer them for you. Sincerely, ..... DELTA ENVIRONMENTAL CONSULTANTS, INC. Michael M. Westerheim, P.E. Project Engineer Mr. long Han, California Regional Water Quality Control Board Mr. Bill Davies, Davies Oil Company Mr. Steve Fraser, Kinder & Wuerfel Mr. Steve Boyle, Clifford, Jenkins & Brown. RIQHT OF ENTRY (the 'License") The property owner(s) (referred to in this Agreement as the 'Owner(s)'), have the sole right to the property for which right of entry is granted. The property is located ar- Jims Supp1s Compans, Inc. 3530 Pierce Road Bakersfield, California The Owner(s) give Davies 0il Company (the'Licensee"), its agents, employees, and assigns, the right to enter upon the property to conduct~ a soil val:~r survey and to do all activities required to complete their work. The Owner(s) and the Licensee ac'kndwledge that Delta Environmental Consultants, Inc. ("Delta") is an agent of the Licensee. This License is effective immediately upon signing. Licensee agrees to repair any damage to the property resulting from entry onto the property by Licensee, its agents, employees, or assigns by restoring the property, as much as reasonably possible, to its condition immediately prior to the Jim Boylan Typed Name Signature Typed Name "Licensee" ' ~panv  T~ped Name of Licensee Signature Bill Davies Typed Name Its: Title Delta Environmental Consultants, Inc. 3330 Data Drive Rancho Cordova, CA 95670 916/638-2085 FAX:916/638-8385 August 2, 1989 Mr. Jim Boylan Jims Supply Company, Inc. 3530 Pierce Road Bakersfield, California 93308 Subject: Proposed Monitoring Well Installation Ground Water Remediation Davies Oil Company, Bakersfield, California Delta Project No. 40-87-326 Dear Mr. Boylan: The purpose of this letter is to request your permission, in writing, to gain access to your property located at 3530 Pierce Road in Bakersfield, California. The property access is required to conduct a ground water assessment and remediation program, as mandated by the Central Valley Regional Water Quality Control Board (Regional Board). The remediation is required to clean up a leak of approximately 2,500 gallons of gasoline from an underground gasoline pipe line on Davies Oil Company property located north of your property. The gasoline leak occurred between October 1985 and March 1986, and the resulting free product plume has been investigated and monitored since June 1986. Delta Environmental Consultants, Inc. (Delta), is acting as a technical consultant on behalf of Davies Oil Company to monitor and remediate the gasoline plume. Enclosed is the latest Semiamzual Ground Water Monitoring and Proposed Additional Work Report which summarizes all ground water information available for the site to date and also presents an interpretation of the location of the free gasoline product plume. Figure 5 of the enclosed report is an illustration showing the inferred location of the free product plume. This interpretation is based upon 3 years of data collected from existing wells located on Davies Oil Company property. The exact downgradient extent of the plume is estimated, and additional monitoring wells are necessary to determine the exact location of the plume and to help evaluate the effectiveness of pumping recovery well RW-1. Current Ground Water Remediation Program Currently, recovery well RW-1 is being used to pump ground water and free gasoline product from the aquifer. The ground water is processed in the on-site treatment system located at the southwest corner of Davies Oil Company property. The treated ground water is then returned to the aquifer through the infiltration gallery located at the northeast corner of Davies Oil Company property. Active ground water remediation and free product recovery began at this site on June 29, 1989. Practical Solutions to Environmental Concerns Mr. Jim Boylan August 2, 1989 Page 2 Since it has been over 3 years since the leak occurred, the free product plume has likely migrated a considerable distance away from recovery well RW-1 and may be out of the capture zone of recovery well RW-1. Additional recovery wells may have to be installed downgradient on your property to recover the entire plume of free product. However, evaluation of additional remedial measures can only be made after the proposed monitoring wells are installed and the data collected from these wells is evaluated. Proposed Monitoring Wells The locations of proposed additional monitoring wells are indicated on the enclosed figure. We propose to install monitoring wells MW-14 and MW-15 on your property. These locations are approximate, and the exact location can only be chosen after all underground utilities have been located. Delta will also work with you to ensure that the well will be placed in a location that will not interfere with any future development on your property. We will'schedule a meeting at the site to pick a mutually agreeable well location and also discuss the well completion procedure. The well may be completed flush grade with a manhole cover or above grade with a locking standpipe. Enclosed is a copy of the proposed well specifications. We will discuss these specifica,tions with you during our on-site meeting. After completion of the well, the site will be cleaned and restored to its condition prior to entry. Delta will need to check the monitoring well periodically to measure ground water elevations and collect ground water samples for chemical analyses. Ground water elevation measurements will be conducted monthly and ground water samples will be collected semiannually. You will be supplied with copies of all reports describing any measurements or monitoring conducted at this site. Delta is working closely with Jong Han of the Regional Board. Jong has indicated that he has spoken with you over the telephone regarding the monitoring well installation, and Song relayed your concerns regarding damage to your property and also your input regarding the actual location of the well. Delta and Davies Oil Company are willing to work closely with you to remove the free gasoline product from the water table beneath your site, and to minimize the inconvenience this may cause you. Enclosed is a right-of-entry agreement that will allow Delta permission to install the monitoring well, and to periodically check the monitoring well. The right-of-entry also binds Delta to restore the site to its original condition. Delta would appreciate your consideration in signing the enclosed document and forwarding it to us. If you wish, Delta can supply you with a certificate of insurance and our drilling contractors certificate of insurance, once one is chosen. Mr. Jim Boylan August 2, 1989 Page 3 If you have any questions regarding this matter or desire further information, do not hesitate to contact me at (916) 638-2085. Sincerely, DELTA ENVIRONMENTAICONSULTANTS~[NC. Michael M. Westerheim Project Engineer MMW:Iaw Enclosures: Right-of-Entry Proposed Monitoring Well Specifications Proposed Well Locations Semiannual Ground Water Monitoring and Proposed Additional Work Report c,c/enc-- Mr. Jong Hah, Cental Valley Regional Water Quality Control Board Mr. Bill Davies, Davies Oil Company Ms. Amy Green, Kern County Health Department Mr. Stephen Boyle, Clifford Jenkins, and Brown (Registered Mail - Return Receipt Requested). 1, ~IG~FI' OF :NTRY (the "License") The property owner(s) (referred to in this Agreement as the "Owner(s)"), have the sole right to the property for which right of entry is granted. The property is located at: Jims Supply Company, I.nc. 3530 Pierce Road Bakersfield, California The Owner(s) give Davi es Oil Company (the'Licensee"), its agents, employees, and assigns, the right to enter upon the property to instal 1 mnnitnrino w~l 1~ and and - ~amp I.e .ground wat~ to do all activities required to.complete their work. The Owner(s) and the Licensee acKnowteoge that Delta Environmental Consultants, Inc. ("Delta") is an agent of the Licensee. This License is effective immediately upon signing. Licensee agrees to repair any damage to the property resulting from entry onto the property by Licensee, its agents, employees, or assigns by restoring the property, as much as reasonably possible, to its condition immediately prior to the entry. Dated this day of ,1989. "Owner(s)" Signature Jim Bo¥1an Typed Name Signature Typed Name "Licensee' Davies Oil Company Typed Name of Licensee Signature Bill Davies Typed Name Title MONITORING WELL CONSTRUCTION DETAILS Project: . .3.3.0..5.}., .G,u.! .f..S..t?..e.t. ......................... .......... Delta No:..4..0.-,8..7.-.3..~.6, ............ Ground Elevation: .... ~.0,~ ................ Top Of Riser Pipe Elevation: ........................ Static Water Level: ..R.a..ng.e., .1.5.-..2.5...f.e.e..t.. Installation'Completed: Date: .............. Time: .................. L1 LOCKING PROTECTIVE CASING - DIAMETER AND MATERIAL - TOTAL LENGTH - LENGTH ABOVE GROUND - SPECIAL KEYS OR LOCKS REQUIRED · · RISER PIP~ , - DIAMETER AND MATERIAL - JOINT TYPE GROUT SEAt, -TYPE OF GROUT AROUND RISER -GROUT SEAL TI'IlC~NESS BENTO~TE SEAL · TYPE OF BENTONITE o BENTO~TE SEAL T~ICKNES$ FILTER PACK - DISTANCE OF FILTER SAND ABOVE TOP OF SCREEN - TYI~ OF FILTER AROUND SCREEN WELL SCREEN · SCREEN MATERIAL · SCREEN GALIG~ OR SLOT SIZE OF OPENINGS · DIAMETER AND LENGTH OF SCp~CEN DI~PTH TO BOTTOM OF MONITORING WELL FROM TOP OF RISER, PI,P.E TOTAI~ BORING DI~PTH DIAMETER OF BORE HOLE 6-inch steel 5.0 feet 2.5 feet Yes 2-inch PVC F1 ush-threaded Neat cement 9.0 feet Pel 1 ets 2.0 feet 1.0 ' foot ~3 Monterey sand PVC slotted 0.0:30 2 inch X 20 feet 34.0 32.0 8 inch Hollow Stem Auger L 4" 32.0 FT DRILLING METHOD COMPLETED BY: .............................. REVIEWED BY: ................................ TOTAL WELL DEPTH BELOW TOP OF RISER PIPE - . ............. FT ADelta Env~onment al Co~sullants. InC. PIERCE F BATTERY SERVtCE DRIVEWAY P~ RES MW-81~ N.D.(B) <O.05(TPH) <O.O5(~r' North ' ' '-"-" TEAMSTERS RUSH SWOAPE LOCAL UNION PROPERTIES NO.87 'IVATE TRUC~ DENCES WASH = I L PRIVATE ~ = B , k RUSH SWOAPE DIESEL ~EpI~D N KERNVILLE STAGE PROPERTIES ~. CO., /~ AND FREIC-.-.-.-.-.-.-.-~T ....:~.' ~s,~(TPH¥' X LAFET~ -/::!~:~.'~/ ;x/4~T,PI-t) //STORAGE MW.S co. y~:~i::.;/N. 7t / Z~ TA~KS _ , ~ - .. · : : .(B) m~(~) '~__ , ~ I ' MW-lO ' ,1~ ~SLANOS <:~ C::3, STORAGE (COV~EO SURFACE) TANK TRAILER PARK e MW-~ ~'. RW-1 l~ MW-14 O.O05(B) 4(TPH) MONITORING WELL LOCATION RECOVERY WELL LOCATION DRY WELL LEAK PROPOSED MONITORING WELL LOCATION BENZENE CONCENTRATION IN PARTS PER Ma.LION TOTAL PETROLEUM HYDRO- CARBON CONCENTRATION IN PARTS PER MILLION NOT DETE~TED ,~'ERRED EXTENT OF F'RE~ PROOUCT Pt. UIv~ INFERRED EXTENT OF DISSOLVED HYDROCARBONS POSSIBLE OLD DIESEL PLUME 0 100 FT SCALE Delta Environmental Consultants. Inc. PROPOSED MONITORING WELL LOCATIONS AN IRFERRED HYDROCARBON PLUME MIGRATIOr MARCH 13, 1989 3305 112 GULP STREET BAKERSFIELD, CA. JOB NO. 40-87-326 [CHK BY /),///~1/./ ~._,.~ AEGIS ENVIRONMENTAL, INC. REMEDIAL ACTION PLAN Davies Oil Company _. 3305,1/2 Gulf Street Bakersfield, California Aegis Project No. 90-204 F~'~u'''~'~- 19~2~ ary 19, Prepared By: AEGIS ENVIRONMENTAL, INC. 1050 Melody Lane, Suite 160 Roseville, California 95678 (916) 782-2110 REMEDIAL ACTION PLAN Davies Oii Company 3305-1/2 Gulf Street Bakersfield, California Aegis Project No. 90-204 February 19, 1992 Prepared By: AEGIS ENVIRONMENTAL, INC. 1050 Melody Lane, Suite 160 Roseville, California 95678 (916) 782-2110 RENIEI~iAL/~'11Oel PI.AN 3305-~ Gulf Street. Bakersfield. California 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 TABLE OF CONTENTS INTRODUCTION .......................................... 1 1.1 Purpose ............................................. 1 1.2 Scope 2 BACKGROUND ........................................... 4 2.1 Site Description ........................................ 4 2.2 Previous Investigation and Remediation ...................... 4 2.3 Documented Unauthorized Release ......... · ................ 7 2.4 Adjacent Land Uses .................................... 7 2.5 Generalized Geology And Hydrogeology ........ .'i:i.; ........... 7 2.6 Water Well Survey ...................................... 8 PROPOSED GROUNDWATER EXTRACTION/TREATMENT SYSTEM AND SOIL VAPOR EXTRACTION SYSTEM INSTALLATION ............ 3.1 Groundwater Monitoring, Groundwater Recovery, and Vapor Extraction System Well Installation and Sampling ........... 3.1.1 Site Safety Plan ................................... 3.1.2 Soil Boring and Soil Sampling ......................... 3.2 3.3 8 9 9 9 3.1.3 Well Installation, Sampling, and Surveying ................. 10 Groundwater Treatment System ............................ 11 Laboratory Analysis and Practical Quantitation Limits ............. 11 SOIL VAPOR EXTRACTION TEST RESULTS AND CONCEPTUAL VES DESIGN ............................. 13 4.1 Vapor Extraction Pilot Test ................................ 13 4.1.1 Definition of Process ................................ 13 4.1.2 Equipment ....................................... 13 4.1.3 Test Situations and Results ........................... 13 4.2 Soil Vapor Extraction System .............................. 16 4.2.1 Conceptual VES Design ............................. 16 4.2.2 Vapor Extraction System Description .................... 17 PERMI'FI'ING AND PROJECT CONTACTS ........................ 17 SCHEDULE .............................................. 18 REPORTING ............................................. 18 REMARKS/SIGNATURES .................................... 20 REFERENCES ............................................ 21 90-204D.RPT - i - REMEDIAL ACrIO~ PI. AN 3305-~ Guff Street, Bakersfield, California FIGURES FIGURE I . . . SITE LOCATION MAP WITH MUNICIPAL WATER WELL LOCATIONS FIGURE 2 . . . SITE MAP WITH SOIL BORING AND GROUNDWATER MONITORING WELL LOCATIONS FIGURE 3 .............. POTENTIOMETRIC SURFACE MAP, JANUARY 17, 1991 FIGURE 4 ..................... GROUNDWATER ELEVATION HYDROGRAPH WELLS MW-l, 2, 3, 4, 5, AND 8 FIGURE 5 ..................... GROUNDWATER ELEVATION HYDROGRAPH WELLS MW-9~.--10, 11, 12, 13, AND 14 FIGURE 6 ..................... GROUNDWATER ELEVATION HYDROGRAPH WELLS MW-15, 16, AND RW-1 FIGURE 7 ............................. CROSS SECTION LOCATION MAP FIGURE 8 ...................................... CROSS SECTION A-A' FIGURE 9 ...................................... CROSS SECTION B-B' FIGURE 10 ..................................... CROSS SECTION C-C' FIGURE 11 .............................. HISTORICAL OCCURRENCE OF PETROLEUM HYDROCARBONS AND GROUNDWATER FIGURE 12 ........ INFERRED EXTENT OF FLOATING LIQUID HYDROCARBONS FEBRUARY 28, 1990 FIGURE 13 .......................... SOIL VAPOR POINT LOCATION MAP FIGURE 14 ........................ PROPOSED SVE AND GROUNDWATER TRF_ATMENT SYSTEM LOCATIONS FIGURE 15 ..... PROPOSED RECOVERY WELL MW-12 CONSTRUCTION DETAILS FIGURE 16 .................... PROPOSED MONITORING WELL/VEW WELL CONSTRUCTION DETAILS FIGURE 17 ...................................... PILOT TEST SYSTEM FIGURE 18 ........................... SVE TEST RADIUS OF INFLUENCE 90-204D.RI='r - iii - REMEDIAL ~ IR.AN 3305-~ Gulf Street, Bakersfield, California TABLES TABLE 1 ............. PREVIOUS LABORATORY ANALYTICAL RESULTS: SOIL TABLE 2 .... PREVIOUS LABORATORY ANALYTICAL RESULTS: GROUNDWATER TABLE 3 ....................................... LIQUID LEVEL DATA APPENDICES APPENDIX A ...................... STANDARD OPERATING PROCEDURES APPENDIX B ...................................... SITE SAFETY PLAN APPENDIX C ...................... ANALYTICAL RESULTS: AIR SAMPLES 90-204D.RPT - iii - REMEDIAL ACTION PLAN 3305-.~ Gulf Street, Bakersfield, California 1.0 INTRODUCTION This remedial action plan (RAP) proposes a scope of work and technical approach to continue groundwater monitoring and to remediate petroleum hydrocarbons in soil and groundwater beneath the Davies Oil Company site (Davies) located at 3305-~/~ Gulf Street, Bakersfield, California (Figures 1 and 2). Fifteen groundwater monitoring wells on and off site are currently dry. The proposed remediation will be achieved by deepening existing monitoring wells to encounter the water table, operation of the existing on site groundwater treatment system, and establishing a vapor extraction system (VES) in existing dry wells and modified existing monitoring wells. AVES pilot test has been completed to maximize efficiency of a proposed VES. The proposed VES is in response to Kern County Environmental Health Services Department's (KCEHSD) letter dated July 19, 1991, authorizing the use of a VES utilizing the existing dry groundwater monitoring wells. Subsequent to the redrilling of four existing dry groundwater monitoring wells and the VES pilot test, a final remediation plan (FRP) will be prepared and submitted. The FRP will contain finalized design elements of the treatment systems including, maintenance and operation plans, schedules, and design drawings of a VES and groundwater treatment system. The results of previous site investigations at the site are presented in Section 2.2. This report, is based, in part, on information generated by previous consultants obtained by Aegis from the client, and is subject to modification as newly acquired information may warrant. 1.1 Purpose The purpose of this RAP is to: Interpret site subsurface soil and groundwater data collected between July 1986 and March 1991; · Propose to operate the existing groundwater remediation system; Propose a workplan for installation of a VES to treat petroleum-impacted soil and groundwater beneath the site; and, Propose to deepen wells for continued monitoring, extraction and treatment of the groundwater plume. 90-204D.RFrT - 1 REMEDIAL ACTION PI.AN 3305-~ Gulf Street. Bakersfield, California 1.2 Scope The conceptual scope of work is based on available information that indicates that the depth to groundwater exceeds the 55-foot depth of the deepest, existing monitoring wells. Information collected and analyzed prior to lowering of the water table below the maximum depth of the existing wells indicated that groundwater flow direction was to the southwest. All available information indicates that the groundwater flow direction was consistently to the southwest. The selection of existing dry monitoring wells for remediation is based on the southwestern groundwater flow direction and the Delta Environmental Consultants, Inc. (Delta), soil vapor survey conducted in November 1990 (described in Section 2.2) that indicated the highest concentrations of detectable soil vapor were located to the southwest of recovery well RW-I. The proposed scope of work contains the following, and will be performed according to the Aegis standard operating procedures (SOP) included in Appendix A: Overdrill existing 2-inch-diameter monitoring wells MW-l, MW-11, and MW-12. Establish 4-inch-diameter monitoring wells in MW-1 and MW-11; establish a 6-inCh-diameter groundwater recovery well MW-12 in the location of former well MW-12. All three wells will be extended to atotal depth of approximately 80 to 95 feet below ground surface (bgs), or a minimum of 30 feet below the current water table. Overdrill existing 4-inch-diameter monitoring well MW-14 and establish a 4-inch- diameter monitoring well to a total depth of approximately 80 to 95 feet bgs, or a minimum of 30 feet below the current water table. Based on the results of field observations and/or measurements, submit selected soil boring samples to a state-certified laboratory for analysis. Survey of the top-of-casing elevation of each well by a registered land surveyor. Measure stabilized water levels in newly deepened, modified, and existing wells. Develop, purge, and collect water samples from each well for submittal to a state-certified laboratory for analysis. · Based on the water levels and survey data, determine the direction and gradient of groundwater flow beneath the site. 90-204D.RPT -2- REME[~AL ~ PLAN 3305-% Gull Street, Bakersfield, California Continue operation of existing groundwater recovery treatment system with deepened well MW-12. The groundwater treatment system operation terminated in February 1990, when well RW-1 went dry. Well MW-12 will be developed and deepened by overdrilling, removal, and re-installation in it's current location. The proposed groundwater treatment system will incorporate well MW-12 into the existing groundwater treatment system. A pilot soil-vapor extraction test was completed on existing wells RW-1 and MW-11 in accordance with the Kern County Air Pollution Control District and KCEHSD guidelines. The airflow from the test wells was monitored for standard cubic feet per minute in relationship to vacuum and air samples were collected from the air stream. The air samples were submitted, under chairi-of-custody, to a state- certified analytical laboratory for analyses of total petroleum hydrocarbons ('TPH), as gasoline, and benzene, toluene, ethylbenzene, and total xylenes (BTEX). Review existing and newly acquired data and install an SVE system, if appropriate. The SVE installation will include, but not be limited to, vapor extraction system specifications and design, permit requirements, and operations and maintenance schedule. Current conceptual projections incorporate existing wells MW-11, MW-12, and RW-1 to be used as vapor extraction wells. Well MW-12 will be incorporated into the groundwater treatment and SVE systems. Review the data, prepare and submit a factual report of the system installation to appropriate regulatory agencies. Results of the proposed remediation may be incorporated into subsequent system design and modification. Subsequent to system installation, permit, and perform and extended pilot test of both the SVE and groundwater treatment systems. Prepare and submit an FRP with operation, maintenance, and analytical data to appropriate regulatory agencies. If horizontal and lateral extent of soil and groundwater plumes are adequately characterized, operate both systems for a 1 year period. Subsequent to the I year operation, submit a summary report documenting system operation, air and groundwater sample analytical results, and quantities of product removed. ~0-204D. RPT -3- · uop, eAeOXe eq~, I~u!Jnp p@u!e],qo S@ldLUeS I!OS U! pe),oe~,ep SCM lenJ lese!p 'OSH30)~ eq~, o~, ~u!pJooo¥ '(Z861. linc 'J.O.L) esn u! JaSUOl ou e JaM taq~, esneo@q/4!l!Oe,t Se!AeQ eq~, LUOJ,t p@AOLUeJ eJeM SNUe~, a§eJo~,s punoJ§Jepun UOlle§-000'01. eeJq~, '9961. Jeqo~,oO Ul · eSeeleJ peoueJ@,teJ eq~, o~, enp uop, euiuJe~,uoo Je~,e~punoJ8 m, eeU!leP o~, ~,duJe~e ue u! pelle~,su! eJeN~ t~-MIAI q§no~q~, 1.-MIAI SlleN~ §upo~,!UOl~l '9861. '1.1. flnP q~noJq~, '6 tint' 8upnp pelduJes pue PelIpP eJeN~ 't,-AAIAI qEinoJq~, 1.-~IAI 'SlleN~ 5UpO~!UOLU Jno=l · seSeeleJ 9861. /cj861. eq~, o~, esuodseJ u! (Z861. ilnr' 'lC)J_) 'e),oseuu!lAI 'lnecl ~,u!es ,to .LO.I_ ~q peuJJo,ued SeN~ uop, el~p, se^u! I!OS eoepnsqns e '9961. ilnr' Ul '(/_861. ilnr '(.LO.L) uop, eJodJoo 6up, se.L sep,!O u!NLL) e~,!s eq~, ~,e '~,SOl ueeq eAeq feLU eU!lOSe6-Jeln6eJ ,to SUOlle6 00~;'~ tle~,eLU!xo~dde leql se!AeO iq pe!,tp, ou se~ QSH30)I 'pe4edeJ f,p, uenbesqns SeN~ pue seu!l Jode^ eq~, u! pm, om, ep SeN~ Heel V '9861. '8 qoJel~i uo ule6e pm, se~, e~e~ seu!l pue S~lUe~, eqj. 'sessol lonpoJd peleoipu! ule6e uop, e!l!OUOOeJ /uolueAu! 'Je~jeeJeq~, fl~Joqs ~,nq 'p@J!edeJ SeN~ eU!l/qlne,t pe~,oedsns eqj. 'seu!l ~,onpoJd eU!lOSe~-~eln~eJ eq~, u! Heel e pe~,eo!pu! S~,lnseJ ~,se~, eq.I. 'seU!l pue S~lUe~, eq~, pe~,se~, eJnsse~d Se!AeO 'seSSOl eseq~, o~, esuodse~ Ul 'LUaU, SiS 6u!sueds!p eU!lOSe6-~elnl~eJ eq~, ,to sp~ooe~ ~JO),UeAU! uo peseq g861. ,to Je~,u!N~ eq~, 6upnp pe~,oelep ~,sJ!,t e~eN~ sessol ~,onpo~cl uo!le!petue~l pue uo!le§!lse^Ul sno!^eJd ~'~ '(E eJn§!=l) s§u!Pl!nq eo!p,o pe~,eleJ q~,!M uop, e~,s eo~Jes lese!p pue @U!lOSe8 §up, eJedo ue iq pe!dnooo ~p, ueJJno s! fqJedoJd eLLL 'e!uJo,t!leC) 'ple!,tsJe>le8 ,to eeJe leP, uep!seJ/le!OJeLULUOO e u! ~,eeJ~,S ,tin9 ~'~-cj088 ~,e peold eoJe!cl jo ep!s ~,see eq~, uo pm, eOOl s! m,!s eq.L uo!ld!Joseo el!S L'~ ONnOtJO)lO~/8 O'C NV'Id NOI/~V REMEDIAL ACTION PI.AN 3305-~ Gulf Street. Bakersfield. California Five additional borings (B-5 through B-8) were advanced on May 5 and 6, 1987, with installation of two groundwater monitoring wells (MW- 8 and MW-9) in the borings. Well MW-9 was installed to investigate downgradient contamination when floating liquid hydrocarbons (FLH) were found in MW-I. Soil borings B-5 through B-7 and monitoring well MW-8 were drilled in response to separate reported releases involving the excavation and removal of the diesel fuel tanks. The groundwater monitoring wells (MW-1 through MW-4, MW-8, and MW-9) were constructed of 2-inch-diameter stainless steel with 15.8 feet of screen. Total depths for these wells ranged from 23.5 to 26.2 feet below surface ('I'CT, July 1987). In October 1987, Delta assumed control of assessment and remediation work at the site. Delta collected groundwater samples in October 1987 (Delta, January 1988). Groundwater flow direction was reported to the west and southwest with a relatively flat gradient. On March 2, and 3, 1988, three additional soil borings were drilled and groundwater monitoring wells (MW-10 through MW-12) installed. The wells were constructed at a depth ranging from 28.38 to 31 feet below surface. Monitoring wells MW-10 through MW-12 were constructed of 2-inch-diameter PVC with 15-foot screen intervals. Well MW-10 was installed to evaluate whether the contaminants had traveled eastward from the release area. Monitoring wells MW-9 and MW-11 were placed downgradient from the release location. Groundwater observations and measurements were made and groundwater samples collected on March-4, 1988, from the nine groundwater monitoring wells. Depths-to-groundwater ranged from 17.56 to 19.42 feet below grade. Only monitoring well MW-1 had a layer of free product (about 0.06 foot thick) (Delta, June 1988). On May 2, 1988, water levels were again measured with MW-1 having a free product thickness of 0.8 foot. Water levels dropped 1.5 feet from the March 1988 measurements. Groundwater flow was determined to be to the southwest with a gradient of 0.003 ft/ft (Delta, June 1988). Recovery well (RW-1) was installed and pump tested on May 3, 1988. The well was installed to 35 feet below surface and is 12 inches in diameter. The recovery well was pumped at a rate of 50 gallons per minute and during this pumping event the water level was lowered from 21.36 to 28.90 feet in RW-1, and approximately 5 feet of product accumulated in RW-1. During this pumping test the groundwater elevation in MW-10, MW-11, and MW-12 were lowered 0.03, 0.05, 0.02 foot, respectively (Delta, June 1988). cU-204D. RPT -5- RENII~31AL AC"1X3N PI.AN 330~ Gulf Street. Ba~(ersfleld. California From May 1988, until May 1989, Delta measured Water levels on November 1988, and January and March 1989, in monitoring wells MW-2, MW-8 through MW-12, and recovery well RW-1. Groundwater elevation measurements made in March 1989, indicated groundwater flow towards the southwest with a gradient of 0.003 fi/ft. The water table had risen 2-1,5 feet between November 1988 and March 1989. Groundwater samples were collected in March 1989. Monitoring wells MW-l, MW-11, and RW-1 were not sampled because of the presence of free product. Based on analytical results and observations, Delta reported that two dissolved hydrocarbon plumes lie under the site; 1) dissolved gasoline; and 2) dissolved diesel (Delta, November 1988 and May 1989). The groundwater recovery and treatment system-started operation on June 29, 1989. The water treatment system was designed to pump groundwater from recovery well RW-1 into a packed column air stripper to remove dissolved petroleum hydrocarbons. The liquid effluent from the air stripper was pumped through a particulate filter to remove particulate matter and through two activated carbon filters in series to remove any remaining hydrocarbons before discharge to the infiltration gallery on site (Delta, August 1989). The groundwater recovery and treatment system which began operation on June 29, 1989, was shut down from September 21 to October 4, 1989, for maintenance work. The unit apparently operated from mid-October, to February 19, 1990, when the water table dropped below the screened interval of the well. The water table had fallen 4.6 feet from June 29, 1989, to February 17, 1990. As of February 19, 1990, the system had recovered and treated approximately 8,002,400 gallons of water contaminated with petroleum hydrocarbons prior to being discharged to the infiltration gallery on site and recovered 57 gallons of free product. Groundwater flow continued to be toward the southwest. Semi-annual groundwater sampling was performed in October 1989, however, wells MW-1 through MW-5, MW-8, and MW-9 have been. dry since October 1989. Floating liquid hydrocarbons were present in MW-11 and were measured for the first time in MW-12 (Delta, February 1990). Based on historical data collected between July 11, 1986, and August 16, 1990, the water table had dropped approximately 19 feet. Since all on site monitoring wells were dry from February 19, to August 16, 1990, Delta did not perform the scheduled groundwater monitoring for March/April 1990 (Delta, August 1990). 90-204D.RFT - 6 - REME~AL AC3]ON PI. AN 3305-{ Gulf Street, Bakersfield. California A total of twenty-five soil vapor points were installed to a depths of about 25-½ feet below surface throughout the Davies property and at two nearby properties (Pierce Properties and Jim's Steel and Supply) in November 1990. The soil vapor survey (SVS) results indicated that the sample concentrations of total volatile hydrocarbons from the soil ranged from less than 1 to 30,000 parts-per-million by volume (ppmv). Figure 13 is an iso-concentration map of volatile hydrocarbons as determined by the SV$ (Delta, November 1990). In January 1991, groundwater monitoring wells MW-13 through MW-16 were installed to a depth of 49 feet below surface with the exception of MW-15 which was installed to a depth of 48.5 feet below surface. All four wells were constructed of 4-inch-diameter Schedule 40 PVC with 30 feet of 0.020 inch slot-size screen. One soil sample was collected from each of the wells immediately above the groundwater surface and submitted for laboratory analysis. Groundwater measurements showed depths to groundwater ranged from 32.35 to 36.62 feet. The groundwater flow was towards the southwest with a gradient of approximately 0.0065 fi/ft. 2.3 Documented Unauthorized Release Davies notified KSEHSD in March 1986, of an unauthorized release following a repair of a leak detected in the vapor lines. Previously, in approximately October 1985, another leak was repaired in the regular-gasoline dispensing line. Davies estimated the dispensing line' leaked approximately 2,500 gallons of regular-gasoline. 2.4 Adjacent Land Uses Davies is located next to a mobile home park on the east, a trucking company to the west, a business plaza to the south and southwest, a pipe storage facility to the south, and Gulf Street to the north. A residential home is also located in the business plaza, immediately to the south of Davies. Figure 2 depicts the relationship of these properties to each other and Davies. 2.5 Generalized Geolocl¥ And Hydrogeology The site is located in the active Fruitvale oil field. Production dates back to the early 20th century. Subsurface materials extending from the surface to greater than 4,000 feet bgs in this field consist of coarse grain sands and gravels deposited by the ancestral Kern River. Previous work indicates that the site is underlain by fine to coarse micaceous sand, silty sand, silt, and minor gravel. Local topography and thesite's proximity to the present day Kern River indicate that these deposits are probably of Quaternary age and that they were deposited in a fluvial or alluvial environment. 90-204D.RPT -7- REMEDIAL ACTION PLAN 3305-~ Gulf Street, Bakersfield, California Based on the surveys performed by Delta, the groundwater elevation on the site has ranged from 394.66 to 389.42 feet above mean sea level (MSL) since July 1986, until March 1989, when the wells became dry. The newest monitoring wells, MW-14 through MW-16, drilled January 1991, show the groundwater elevation to be at an average of 374.64 feet above MSL. Based on available information, the water-bearing zone/aquifer appears to exist under unconfined conditions. The groundwater flow direction has been reported in the past to be to the southwest. 2.6 Water Well Survey A comprehensive listing of domestic, irrigation, and municipal water wells has not been completed at the time of this report preparation. Information provided by the Kern County Water District, Water Department, and the City of Bakersfield,- Department of Public Works, Water Division, indicate that there are two municipal water wells in the general area (Figure 1). The primary function of these two wells (F-103 and F-101) is to provide water for fire suppression in this area. Both wells are perforated at depths below 200 feet. Well F-103 is a back up well which is operational approximately once a week. Well F-101 is in semi-continuous operation with a capacity of approximately 1,200 gallons per minute. The static water level in well F-103 is approximately 200 feet bgs. The pumping water level in Well F-101 is approximately 110 feet bgs. The pumping water level in well F-103 has fallen approximately 50 feet in the last 3 years. (Oral communication, Florin Core, November 13, 1991). This portion of Bakersfield and adjacent Kern County is supplied with treated water piped into the area by the City. of Bakersfield. 3.0 PROPOSED GROUNDWATER EXTRACTION/TREATMENT SYSTEM AND SOIL VAPOR EXTRACTION SYSTEM INSTALLATION The proposed remedial action plan addresses the redrilling of four existing groundwater monitoring wells (MW-l, MW-11, MW-12, and MW-14). A 6-inch-diameter recovery well will be established in the current location of monitoring well MW-12. The deepened wells will intersect the water table to re-establish hydrogeologic data points for gradient determination, sampling, and groundwater recovery. The new groundwater recovery well RW-2 (MW-12) will be utilized to remove and treat hydrocarbon containing water and free product, but primarily to control groundwater gradient. An SVE pilot test of newly deepened and existing wells will be utilized to maximize SVE efficiency and design a finalized system. Monitoring and recovery well establishment, groundwater treatment, SVE pilot test, and a conceptual VES system are described below. 90-204D.RPT - 8 - REMEi3~AL ACTION Pr. AN 3305-~ Gulf Street, Bakersfield, California 3.1 Groundwater Monitoring, Groundwater Recovery, and Vapor Extraction System Well Installation and Sampling The overdrilling of existing 2-inch wells MW-l, MW-11, and MW-12, and a 4-inch well MW-14 (Figure 14) will be completed as described below. Soil sampling will be in accordance with the SOP contained in Appendix A. 3.1.1 Site Safety Plan A site safety plan (SSP) has been prepared and will be on site during all field activities. A copy of the SSP is included as Appendix B. All on site work described herein will be conducted according to the SSP. The SSP contains information on the properties of the hazardous materials determined to be on site (by previous investigation). This information is equivalent to that contained within the material safety data sheets. 3.1.2 Soil Boring and Soil Sampling Three soil borings will be advanced from below approximately 30 feet bgs at the location of existing 2-inch-diameter monitoring wells MW-l, MW-l l, and MW-12. The existing 2-inch-diameter monitoring wells (dry since January 1991) will be destroyed by removal of the casing and over drilling. Material below 30 feet bgs will be sampled and described in accordance with Aegis SOP contained in Appendix A. The new wells will extend to approximately 90 feet bgs, or until a minimum of 30 feet of water-bearing material has been drilled. Care will be exercised not to penetrate a confining layer greater than 3 feet. A fourth boring will be advanced from below 50 feet bgs at the location of existing 4-inch-diameter monitoring well MW-14. The existing 4-inch-diameter monitoring well (dry since January 1991) will be destroyed by removal of the casing and overdrilling. Material below 50 feet bgs will be sampled and described in accordance with Aegis SOP contained in Appendix A. The new wells will extend to approximately 90 feet bgs, or until a minimum of 30 feet of water-bearing material has been drilled. The borings will be drilled, using l 1-inch outside-diameter hollow-stem augers, approximately 30 feet into the first water-bearing zone or until a maximum of 5 feet of Iow-estimated permeability confining material is encountered. Drilling into such a confining layer will be done so as to avoid its complete penetration, and maintain the layer's integrity. Aegis may elect to continuously core one or more of the borings to more completely evaluate the subsurface sedimentary and/or lithologic conditions. During drilling, the subsurface soils and' alluvial materials of the vadose and the saturated zone will be sampled at 5-foot intervals. The sampling interval may be shortened where subsurface conditions warrant. The soil samples will be screened in the field, using a portable photoionization detector (PID), for possible laboratory analysis. 90-204D. RPT -9- REMEDIAL ACTION PLAN 3305-~, Gulf Street, Bakersfield, California Drilling and soil sampling equipment will be either steam cleaned or washed prior to first use, and between borings, to reduce the possibility of cross-contamination. Rinsewater will be stored temporarily on site in U.S. Department of Transportation (DOT)-approved 55-gallon drums, pending laboratory analysis of the boring samples. Following receipt of the laboratory results, the rinsewater will be transported from the Davies Oil site to Gibson Oil, a licensed petroleum hydrocarbon recycling/disposal facility located in Bakersfield, California. All drill cuttings will be stored temporarily on site, on and under plastic sheeting, pending laboratory analysis of either the boring samples or additional samples collected from the stockpile that may be required in order to determine proper disposal. Following receipt of the laboratory results, the drill cuttings will be transported, by a licensed hauler, from the Davies site to an appropriate disposal facility. ... 3.1.3 Well Installation, Sampling, and Surveying Four-inch-diameter groundwater monitoring wells will be established in the locations currently occupied by monitoring wells MW-l, MW-11, and MW-14. An 8-inch-diameter groundwater recovery well will be established in the deepened well MW-12. Conceptual monitoring and recovery well schematics are included as Figures 15 and 16. Water sampling equipment will be either steam-cleaned or washed prior to first use. Separate sampling equipment will be dedicated to each well to reduce the possibility of cross-contamination. The wells will be completed as indicated on Figure 5, with perforated casing extending, where possible, from 5 feet above the highest anticipated level of groundwater to 30 feet into the zone of first water. Each of the wells will be capped with a locking wellhead cap and secured by a water-tight, traffic-rated wellhead vault. The top-of-casing elevation above MSL of each well will be surveyed, using either an established or temporary bench mark, by a licensed surveyor. Depth-to-water measurements in each well will be adjusted to this new datum. Well development water will be stored temporarily on site in DOT-approved 55-gallon drums, pending laboratory analysis of the groundwater samples. Following receipt of the laboratory results, the development water will be transported, by a licensed hauler, from the Davies site to Gibson Oil, a licensed petroleum .hydrocarbon recycling/disposal facility located in Bakersfield, California. 90-204D.RPT ~10- REMEDIAL ACTION PI. AN 3305-~ Gulf Street. Bakersfield. California 3.2 Groundwater Treatment System The deepening of wells MW-l, MW-11, MW-14, and MW-12 will allow determination of groundwater gradient and flow direction, and allow the collection of groundwater samples or floating liquid hydrocarbons. Based on the concentrations of petroleum hydrocarbons or floating liquid hydrocarbons encountered by wells MW-l, MW-11, and MW-12, the existing groundwater treatment system may be modified to accept water from one or all of these wells. Subsequent operation will include: a) Collection of necessary permits; b) c) Separation and lawful disposal of free-phase liquid hydrocarbons; Removal of volatile aromatic compounds (VOC) by air-stripping; d) Subsequent to authorization by appropriate agencies, disposal of remediated water in available sanitary sewer lines. The existing groundwater-treatment system consists .of recovery well RW-1 (dry), groundwater, and free product removal pumps located in RW-1, conduit and piping with attendant trenching, a concrete pad, an airstripping tower with blower, gauges and manifolds, and treated-groundwater piping connected to an upgradient infiltration gallery. Volatile petroleum hydrocarbons removed from groundwater were formerly discharged directly into the' atmosphere. Aegis proposes to discharge treated groundwater into the sanitary sewer, if possible. 3.3 Laboratory Analysis and Practical Quantitation Limits Soil and groundwater samples will be submitted to Sparger Analytical Laboratories (Sparger) a state-certified analytical laboratory located in Sacramento, California. Air samples will be submitted to NET Pacific, a state-certified analytical laboratory located in Santa Rosa, California. The selected soil samples will be analyzed for concentrations of: a) TPH, as gasoline and diesel, by Cai DHS LUFT methodology; b) BTEX, by EPA Method 8020; and, c) Total lead by EPA Method 7240. In each boring, a minimum of two samples, one from above and one from below the air-water interface, will be collected for possible analysis of grain-size distribution. 90-204D. RPT - 11 - REMEDIAL ACTION PLAN 3305-~ Gulf Street, Bakersfield, California The selected groundwater samples will be analyzed for concentrations of: a) TPH, as gasoline and diesel, by CAL DHS LUFT methodology; b) BTEX by EPA Method 602; and, c) Total lead by EPA Method 7240. The selected air samples will be analyzed for: a) TPH, as gasoline, by GC/FID; and, b) BTEX by GC/PID. - .... In accordance with the "Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites," the practical quantitation reporting limits (PQL) for both soil and water analyses are as follows: Soil - a) for TPH, as gasoline, the PQL is 1.0 parts-per-million (ppm); b) for TPH, as diesel, the PQL is 1.0.ppm; and, c) for BTEX the PQL is 0.005 ppm. Water - a) for TPH, as gasoline, the PQL is 0.001 ppm; · b) for TPH, as diesel, the PQL is 0.001 ppm; and, c) for BTEX the PQL is 0.0005 ppm. In addition, a spike peak, surrogate sample and standards will be run to ensure quality assurance and quality control of the analyses. 90-204D.RPT -12- REMEDIAL ACTION Pr. AN 3305-~ Gulf Street, Baker$flelcl, California 4.0 SOIL VAPOR EXTRACTION TEST RESULTS AND CONCEPTUAL VES DESIGN Current evaluation of site conditions indicates subsurface materials consisting of porous, unconsolidated sand and gravel units, conducive to soil vapor extraction. 4.1 Vapor Extraction Pilot Test A 6-hour soil venting test on recovery well RW-1 was proposed to the KCAPCD by Aegis in correspondence dated October 17, 1991. This soil vapor extraction (SVE) pilot test was authorized in KCAPCD correspondence dated November 4, 1991. The SVS pilot test was conducted at the Davies Oil Company, 3305-~,5 Gulf Street, Bakersfield, California, on November 20, 1991 (Figure 1). 4.1.1 Definition of Process The process of SVE is the inducement of airflow through the natural voids in soil, by advection, and collected through a VEW. VOC within the voids are extracted with the air stream through the vacuum introduced through the VEW into the subsurface. The airstream containing VOC is then passed through an air-purifying process prior to emission to the atmosphere (Figure 17). 4.1.2 Equipment The inducement of advection in the soil (soil venting) is accomplished through the use of a VES. The components of the VES inClude; the VEW and manifold piping, an in-line particulate air filter, an air/water separator, an air pump (blower), atmospheric pressure gages, airflow meters, temperature indicators and carbon canisters. 4.1.3 Test Situations and Results The pilot test was conducted in two test situations. Test Situation One was performed on recovery well RW-1. Test Situation Two was performed on monitoring well MW-11. The VES was connected tothe test well, in each test situation, through a conduit of 2-inch PVC pipe. The VES discharged the collected air and VOC through 2-inch PVC pipe to a pair of 200-pound carbon canisters connected in series. The discharge from the carbon canisters was then exhausted through a 2-inch PVC exhaust stack approximately 15 feet above the surface of the site. The following measurements were made at the start of the VES test: a) The pressure (psi), airflow (cfm), and temperature from the airstream drawn from RW-1 and MW-11; and, b) The pressure, airflow, and temperature from the exhaust emitted from the carbon canisters to the atmosphere. 90-204O.RPT - 13- REMED(AL ACllON RAN The concentrations of VOC in the intake airstream drawn from RW-1 and MW-11 were determined by the collection of an air sample in a vacu-sampler from a sample port located between the wellhead and the compressor. The air samples were collected according to the Aegis SOP included in Appendix A. The measurements are utilized in calculating the extraction of VOC mass' in pounds-per- day from the subsurface and are as follows for Situations One and Two. SITUATION ONE: RW-1 System Parameters: Average intake airflow ......................................... '69 cfm Average intake pressure .................................... -.1226 psi Average intake temperature ................................. 74 deg. F. Average exhaust airflow ....................................... 72 cfm Average exhaust pressure ., .................................. 0155 psi Average exhaust temperature ............................... 96 deg. F. Test duration: 6 hours No fresh air was admitted into the system. Air samples were collected at the end of the each test. Constituent Extraction in pounds per day (extrapolated to 24 hours): Benzene ................................................... 0.11 Ethylbenzene ................................................ 0.19 Toluene .................................................... 0.61 Xylene ..................................................... 1.10 Total Pounds/Day (TPH, as gasoline) ............................ 49.00 Note: The constituent results presented are based on the analytical results in Appendix C. The constituent extraction in pounds per day was calculated using ideal gas law equation: PV=nRT or n = PV RT where P = pressure in atmospheres (converted from measured gauge pressure) V = volume in liters (for 24 hours at measured cfm) n = number of moles (in 24-hour period) R = gas constant 0.0821 (liter-atmosphere/mole-Kelvin) T -- temperature in Kelvin (converted from measured °F) 90-204D.RFrF - 14 - RE~ A~ PI.AN 3~ Gulf Stree~ B~kersfleld, California The ideal gas equation is rearranged to calculate the number of moles of gases drawn through the blower (n). The number of moles of each constituent is calculated by multiplying the laboratory analytical results (in ppm) by the number of moles of gases drawn through the blower. The gram mass of each of the constituents is calculated by multiplying the molecular mass of the constituent by the number of moles of the constituent. A value of 114 grams per mole (corresponding to octane) was assumed for an average molecular mass of TPH, as gasoline. The number of pounds of a constituent is calculated by dividing the number of grams by 453.6 (grams/pound). Radius of Influence The radius of influence induced by the vapor extraction pilot test was measured and listed below. Refer to Figure 18 for adjacent well locations. Sphere of influence from test Situation One: MW-1 = -0.4-inches H20 at 10 linear feet from RW-1 MW-11 = -0.16-inches H20 at 40 feet linear feet from RW-1 MW-10 = -0.06-inches H20 at 112 feet linear feet from RW-1 MW-4 = -0.01-inches H20 at 143 feet linear feet from RW-1 MW-8 = -0.01-inches H20 at 112 feet linear feet from RW-1 MW-12 = -0.06-inches H20 at 97 feet linear feet from RW-1 MW-2 = -0.01-inches H20 at 166 feet linear feet from RW-1 SITUATION TWO: MW-11 System Parameters: Average intake airflow ......................................... 67 cfm Average intake pressure .................................... -.2671 psi Average intake temperature ................................. 74 deg. F. Average exhaust airflow' . ...................................... 69 cfm Average exhaust pressure .................................... 0137 psi Average exhaust temperature ............................... 96 deg. F. Test duration: 2 hours No fresh air was admitted into the system. Air samples were collected at the end of the each test. 90-204O.RPT -15- RI~MEDIAL ACTIO~I PI.AN 330§-t~ Gulf Street. Bakersfield. California Constituent Extraction in pounds per day (extrapolated to 24 hours): Benzene ................................................... 1.10 Ethylbenzene ..... ' .......................... ; ................ 0.55 Toluene .................................................... 2.90 Xylene ............... : ..................................... 3.10 Total Pounds/Day (TPH, as gasoline) ............................ 60.00 Note: The constituent results presented are based on the analytical results in Appendix C. Radius of Influence The radius of influence induced by the vapor extraction pilot test was measured and listed below. Refer to Figure 18 for locations of adjacent wells. Sphere of influence from test Situation Two: MW-12 = -0.11-inches H20 at 57 linear feet from well MW-11 MW-2 = -0.05-inches H20 at 87 linear feet from well MW-11 MW-1 = -0.11-inches H20 at 48 linear feet from well MW-11 MW-10 = -0.015-inches H20 at 120 linear feet from well MW-11 MW-3 = -0.03-inches H20 at approximately 125 linear feet from well MW-11' 4.2 Soil Vapor Extraction System 4.2.1 Conceptual VES Design Four-inch-diameter monitoring well MW-11, 10-inch recovery well RW-1 (dry since FebrUary 1991), and 6-inch-diameter groundwater recovery well RW-2 (MW-12) are proposed for incorporation in the VES (Figures 15 and 16). The locations for the VEW were chosen to maximize the airflow through the petroleum-impacted soils and varying iithologiC changes. The conceptual design proposed in this RAP may be modified based on conditions encountered in the field after operation for a fixed period of time (extended pilot test) and subsequent review of available -data. Finalized emissions control will be designed and design drawings will be submitted in a final remedial plan (FRP). Conceptual emission controls being evaluated based on available data include internal combustion engines, thermal oxidation, catalytic oxidation, and carbon polishing. Final design elements including emissions control will be presented in a FRP. 90-204D.RPT - 16 - R~MEI~AL ~ PI.AN 3305-~ Gulf Street. Bakersfield. California 4.2.2 Vapor Extraction System Description The proposed system will consist of up to three VEW, subsurface horizontal piping runs, lines, valves, a vacuum pump, surface controls, and emission controls. The proposed VEW will be connected to separate 4-inch-diameter PVC horizontal piping runs that will daylight in the proposed treatment area. The piping will be placed in 3-foot-deep by 2-foot-wide trenches backfilled with pea gravel. Each horizontal pipe will be equipped with isolation valves that will enable the shut off of airflow from the VEW to the SVE. The manifold lines will be graded to drain toward the VEW to reduce condensate accumulation in the SVE treatment system. The surface controls will include process flow valves, thermometers, pressure gages, an airflow monitoring device, and air sampling ports. The feasibility of monitoring of the system by telemetry will be evaluated as the system design is finalized. The proposed vacuum pump, an MD pneumatic positive displacement pump, should be capable of producing an airflow of at least 100 cfm with a vacuum of greater than 20 inches of water column. The vacuum pump will be equipped with a vacuum relief valve to protect the pump from overheating. The piping near the vacuum pump will be equipped with a recirculation valve to control the vapor flow rate from the VEW. Details of the emission control device to be'used will be included in the FRP and in. the Authority to Construct/Permit to Operate permit application. After system installation, concentrations of VOC from the influent airstream drawn from the VEW and effluent airstream emitted from the SVE will be measured with a flame ionization detector. The proposed monitoring will be performed in accordance with the operations and maintenance schedule presented in the FRP required by the appropriate regulatory agencies. To confirm the accuracy of the monitoring, air samples from the influent and effluent of the emission control device will be taken, as required, during operation of the proposed vapor extraction system. Current conceptual design may incorporate en-echelon treatment, (i.e., thermal oxidation followed by carbon polishing), if warranted. 5.0" PERMI'I-FING AND PROJECT CONTACTS Well construction permits from the KCEHSD will be required for the work proposed. Review of this workplan by KCEHSD staff is required prior to beginning the fieldwork. The KCEHSD review and the permitting process is expected to take.up to 3 weeks to complete. Additional permitting will be required for equipment installation, system installation and operation, permitting of an extended pilot test, and subsequent to submittal of a final FRP. 90-204D.RPT -17- REMEi~AL ACTION PI.~N Gulf Street, Bakersfield. California Project Contacts/Representatives Davies Oil Company: Mr. Bill Davies Davies Oil Company Post Office Box 80067 Bakersfield, California (805) 323-6063 .¢ 93380 Aegis Environmental, Inc. Mr. Mark Richards Aegis Environmental, Inc. 1050 Melody Lane, Suite 160 Roseville, California 95678 (916) 782r2110 ) Kern County Air Pollution Control District Mr. Tom Goff 2700 "M" Street, Suite 275 Bakersfield, California 93301 (805) 861-3682 Kern County Environmental Health Service Department Ms. Dolores Gough County Of Kern 2700 "M" Street Bakersfield, California 93301 (805) 861-3636 6.0 SCHEDULE Redrilling of wells as proposed in this report can be initiated within 2 weeks of authorization to proceed from the appropriate regulatory agencies. Results of field work, including laboratory analytical results, boring logs, and monitoring well construction schematics and gradient information may be reported within 30 working days of receipt of analytical results. The final remedial plan, FRP may be submitted within 60 working days of receipt of analytical data, and will include design drawings and operation and maintenance schedules. 7.0 REPORTING As a result of the proposed remedial action plan contained in this document, a results report will be generated containing, but not necessarily limited to: · Discussions of the site background, investigative methods used and local and regional hydrogeology; · Boring and well-completion logs; · A potentiometric surface map of the shallow water-bearing zone; · Distribution map(s) of hydrocarbons dissolved in groundwater; 90-204D.RPT - 18 - REMEDIAL AC/K3~ PI. AN Gulf Street. Bakersfield. California Cross-section(s) of the project site's shallow subsurface depicting the relationship of soils and alluvial materials to the groundwater level, laboratory analytical data and well construction details; Soil vapor extraction pilot test results including airflow/vacuum and petroleum hydrocarbon recovery; Information gathered as a result of a survey of both active and inactive municipal, agricultural, industrial and domestic water wells; Laboratory reports and chain-of-custody forms; and, A final RAP containing finalized design elements of a VES and groundwater treatment system. 90-204D, RPT - 19 - REMEDIAL ACTION PI.AN 3305-~ Gulf Street, Bakersfield, California 9.0 REFERENCES "Subsurface Contamination Assessment," July 9, 1987, Twin City Testing Corporation, Saint Paul, Minnesota. "Quarterly Monitoring Report and Proposed Additional Work," January 10, 1988, Delta Environmental Consultants, Inc., Rancho Cordova, California. "Quarterly Monitoring Report," June 10, 1988, Delta Environmental, Inc. "Proposal for Additional Site Assessment and Remedial Action," November, 1988, Delta Environmental, Inc. "Semiannual Groundwater Monitoring Report and Proposed Additional Work," May 25, 1989. ;'Remedial System Monitoring Report," August 1989, Delta Environmental, Inc. "Remedial Action Status and Semiannual Groundwater Monitoring Report," February 28, 1990, Delta. "Workplan for Additional Off-Site Hydrogeologic Investigation and Project Status," August 24, 1990, Delta Environmental, Inc. "Soil Vapor Report," November 20, 1990, Delta Environmental, Inc. "Soil and Ground Water Analytical Results and Monitoring Well Installation Report," February 13, 1991, Delta Environmental, Inc. 90-204D.RFT - 21 - .FIGURES ~ump o Land¢~ o 'o~ F-iO1' Mile 2.1,./' "~ / . ,'Drive-in ;,' Theater 404. .,? II SCALE: 1"= 2,000' 0 2,000 GENERAL NOTES: BASE ,MAP FROM, USGS 7.5 MINUTE TOPOGRAPHIC OILDALE. C,-~LIF. Appro~mate Locations of City of Bakersfield Fairhaven Unit Municipal Water Supply Wells FIGURE 1 SITE LOCATION MAP Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job DRAWN BY: Ed Bernard REVIEWED BY: Number 90-204 DATE: Aug. 12, 1991 DATE: Pa~king / PIERCE ROAD Open Space UPS Storage Area ~ Buddm~ Pipe Storage W-1 ~o J Jim's Steel And Supply - -_-~1~-.~.-- g$ ~-I '~ MW-8'"r" ~ ...... ":'' !1~ B.7e i" ~~'~;'~'-~ Teamsters Local Union No. 87 Rush Swoape Properlies At~andoned Private Well Truck Wash Kernville Stage And Freight Open Lot Truck Parking ,., MW-2 MW- _e' Infiltration Gallery (covered surface) Approximate Scale 1" = 100' 0 100 LEGEND Monitoring Well A Recovery Well []Dry Well · Soil Boring Approximate Locations Of Existing/Proposed Buried Utilities NOTE: Site Sketch After Site Vicinity Map By Delta Environmental Consultants Inc. Project # 40-87-326 January 17, 1991 FIGURE 2 SITE MAP with SOIL BORING and MONITORING WELL LOCATIONS Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 DRAWN BY: Ed Bernard REVIEWED BY: DATE: Aug. 6, 1991 DATE: Parkm~l i ~ :::::::::::::::::::::::::::::::::::::::::::: [::::~ ~ ::[ Battery Open Space I ~ UPS Storage Area Pipe Storage PIERCE ROAD ,~(W- 14 372.32) Building '~MW-15 (373.43) Jim's Steel And Supply Teamsters Local Union No. 87 Private Well And Freight Truck Wash Rush Swoape Properties Cummingst Open Lot Truck Parki~ t N-12 , MW-2 ...5'~'~ & '_l I~ation Gallew ~ (covered sudace) Approximate Scale 1" = 100' 0 100 LEGEND Monitoring Well (378.17) / Groundwater Elevation 377.3 Potentiometric Surface Contour (dashed where inferred) I Estimated Direction of '~ J Groundwater Flow A Recovery Well [] Dry Well Leak Approximate Locations Of Existing/Proposed Buried Utilites NOTE: Site Sketch After Site Vicinity Map By Delta Environmental Consultants Inc. Project # 40-87-326 January 17, 1991 FIGURE 3 POTENTIOMETRIC SURFACE MAP JANUARY 17, 1991 Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 DRAWN BY: Ed Bernard DATE: Aug. 6, 1991 REVIEWED BY: DATE: 394. ,392 390 388 586 584 382 380 376 ,374 372 ..370 May 87 Dec 87 May 88 Jan 89 Jun 89 Oct 89 Jan 90 May 90 Aug 90 Date of Measurement MW-- '1 + MW--2 0 MW--`3 ~ MW--4. X MW--5 '~ MW--8 DRAWN BY: REVIEWED BY: FIGURE 4 GROUNDWATER ~ ~-'VATION HYDROGRAPH Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA AEGIS Job No. 90-204 Dennis Hada DATE: November 16, 1991 DATE: .~96 394 392 390 388 386 382 378 376 ~,74 372 370 ,Mw -9 May 87 Dec 87 May 88 Jan 89 Jun 89 Oct 89 Jan 90 May 90 Aug 90 Date of Measuremen[ + MW--lO 0 MW--11 A MW--~2 X MW-- 1 .~ ~ MW--t4 FIGURE 5 GROUNDWATER ELEVATION HYDROGRAPH Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA AEGIS Job No. 90-204 DRAWN BY: Dennis Hada DATE: November 16, 1 REVIEWED BY: DATE: 394 392 590 - 588 - 586 - 384 - 382 - 3~0 - 378 - 376 ' 374 ~ 372 ~ 370I Jul'86 J 0ct~87 iMa; 88 I Nov' 88 t Mo; 891 JulY89 jNov' 89t Feb[ 90 J dullg0 I Jan' 91 Uoy 87 Dec 87 Moy 88 Jori 89 Jun 89 Oct 89 Jon 90 Moy 90 Aug 90 Dote of Meosurernent ¢3 MW--15 + MW--16 o RW--1 DRAWN BY: REVIEWED BY: FIGURE 6 GROUNDWATER ELEVATION HYDR~H Davies Oil Comoany 3305 1/2 Gulf Street Bakersfield, CA AEGIS Job NO. 90-204 Dennis Hada DATE: November 16, 1991 DATE: 0 · 5 . 10 , 20 , 25 ' 30 35 40 45 55 B MW-15 SP SP BDL BDL SW/GW TD = 48.5' 4" Dia_ MW-14 SP SP 0O4 __ BDL SW/GW TD = 49.0' 4" Dia. MWo13 sP SP/GW BDL BDL TD = 55.0' 4" Dia. SCALE: HorizontAl 1" = 60' Vertical 1" = 10° Vertical Exaggeration 6x I 0 60 LEGEND 0.004 BDL Benzene Concentration TPH - Gasoline Concentration' Screened Interval TD = 55.0' Total Depth 4" Dia. Diameter of Well Samples Taken During Soil Boring Operation Analytical Results In ppm (parts per million) BDL = Below Detection Limits MW = Groundwater Monitoring Well FIGURE 9 CROSS SECTIONS B -B' Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 DRAWN BY: Ed Bernard DATE: Aug. 7, 1991 REVIEWED BY: DATE: PIERCE ROAD A W-13 Battery Sen/ice Open Space UPS Builni~ RERCE ! I MW-15 Offices' UPS Storage Area Jim's Steel And Supply Pipe Storage Teamsters Local Union No. 87 '1 Rush Swoape Properties Abandoned Private Well Truck o:.:.:.~.-:..::.:. :.:.:.:.:..,:, .:. ::::::::::::::::::::::::: Kernville Stage And Freight Open Lot Truck Parking i!iiCummings ::ii Diesel , MW-2 MW-5 _~_ uilding Daves Oil Company Infiltration Gallery (covered surface) Approximate ScaJe 1" = 100' 0 100 LEGEND ~ Monitoring Well ~ Projected Monitoring Well ~, Recovery Well [] Dry Well Approximate Locations Of Existing/Proposed Buried Utilities NOTE: Site Sketch After Site Vicinity Map By Delta Environmental Consultants Inc. Project # 40-87-326 January 17, 1991 FIGURE 7 CROSS SECTION LOCATION MAP Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 DRAWN BY: Ed Bernard DATE: Aug. 6, 1991 REVIEWED BY: DATE: 0 · 10 15 · 20 · 25 · 30 · 40 · 45 · 50 · 55 C MW-8 MW-4 MW-1 SP TD= 25.0' TD= 25.0' 2" Dia. ~._ 2" Dia. SP/SM TD= SP/SM 750 SP MW-lO TD= 30.0' 2" Dia. SP/SM SP MW-3 BDL BDL TD= 25.0' 2" Dia. bt. SP/SM MW-16 sP SPiGW BDL BDL TD= 49.0' 4" Dia. SCALE: Horizontal 1 °' = 60' Vertical 1" = 10' Vertical Exaggeration 6x I 0 60 LEGEND 3.3 BDL Benzene Concentration TPH - Gasoline Concentration Screened Interval' TD = 55.0' Total Depth 4" Dia. Diameter of Well NOTE: Samples Taken During Soil Bodng Operation Analytical Results In ppm (parts per million) BDL = Below Detection Limits FIGURE 10 CROSS SECTIONS C - C' Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job DRAWN BY: Ed Bernard REVIEWED BY: Number 90- 204 DATE: Aug. 7, 1991 DATE: PIERCE ROAD Z UPS Storage Area Pipe Storage MW-14 .%::-':':'.'.'~,.~..,:':'~4:,~..,.~ iii Buil,.d.!ng i i ~:: ::::ii~,.',.".."~ ~ :::: ~ :::::: ~ ~.-.~,%,.':~ 8 ~4. ::: :::::::". :::'::'.','.'.' ~.'.'. :~ :~:~.i:M :". ::::::::::::::::::::::::::::::: ~MW-15 · Jim's Steel And Supply _~' ~ 7-", I ~ MW~.~ NOTE: Site Sketch After Site Vicini~ Map By Delta Environmental Consultants Inc. Proje~ ~ 40-87-326 Janua~ 17, 1991 Teamsters Local Union No. 87 Abandoned Private Well Truck Wash Rush Swoape Properties Kernville Stage And Freight Open Lot Truck Parking \ S~o~ge..:; -11 \ Tan¥: V-1 0~1 0 l!!Cummings] Diesel' Pump I$tanOs Building _.~.MW- 16 Daves Oil Company Infiltration Gallery (covered sudace) Approximate Scale 1" = 100' 0 100 LEGEND Monitoring Well Recovery Well Dry Well Leak Approximate Locations Of Existing/Proposed Buded Utilities Inferred Extents Of Dissolved HYdrocarbons Inferred Extent{ Of Floating Liquid Hydrocarbons (Delta Feb. 28, 1990 Remedial Action Status & Semi Annual Groundwater Monitoring Report) FIGURE 12 INFERRED EXTENT of FLOATING LIQUID HYDROCARBONS (February 28, 1990) Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 DRAWN BY: Ed Bernard REVIEWED BY: DATE: Aug. 6, 1991 DATE: PIERCE MW-14 ROAD I SP-17 SP-I~ ~ I SP-23 W-15 SP-22 UPS Storage ':':':::'::::" a Are :::::::::::::::::::::: ::::::::::::::::::::::::: ,~:::. :.::::::::::::.':::::: :..-.':::-.::.~:..:.~:'~.::- Pipe Storage SP°21 · JhTl's Steel And Supply SP-19 ~MW-12 SP-3 "' I NOTE: Site Sketch After Site Vicinity Map Showing Locations Of Soil Vapor Points By Detta Environmentat Consultants Inc, Project # 40-87-326 January 17, 1991 Teamsters Local Union No. 87 Rush Swoape Properties Abandoned Private Well Truck Wash · Kernville Stage And Freight Open Lot Truck Parking Ken. ·Cummings :: Diesel MW-5 ~ Building Daves Oil Company Infiltration Gallery (covered sudace) Approximate Scale 1" = 100' 0 100 LEGEND SP-17 · lOO Soil Vapor Point Location Installed At 25.5 Ft Monitoring Well Recovery Well Dry Well Leak Approximate Locations Of Existing/Proposed Buried Utilities Iso-Concentration Contour Of Total Volatile Hydrocarbons In Parts Per Million. (25.5 Ft. Below Grade, October 10-12, 1991 FIGURE 13 SITE MAP SHOWING LOCATONS OF SOIL VAPOR POINTS Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 DRAWN BY: Ed Bernard DATE: Oct. 9, 1991 REVIEWED BY: DATE: MW-9 Concrele Pall For Walm' Trealme~l Syslem vlW-12 Kemville Stage And Freight Open Lot Truck Parking Tar~s - -, ~ , Ur~ergoun~ Storage Tanks MW-3 .~_ J-' o, [] Storage 4 Inch Buried Wate~ 0isch~rge LJne To ._~,,,,,,,,"~ Inliltra~on Gallery (2 ft. be~ Ground) Monitoring Well Recovery Well Dry Well Approximate Locations Of Existing/Groundwater Recovery System Piping Proposed SVE System Piping Proposed Extention of Groundwater Recovery System Piping I-- : Appmxirnate Scale U.i , 1" = 50' n- 0 50 MW-5 ~ e Mw-16 Pump ~ =s~a.os Daves Oil Company infiltration Gallery (covered surface) L NOTE: Site Sketch After Site Vicinity Map By FIGURE 14 Delta Environmental Consultants Inc. : PROPOSED SVE and GROUNDWATER Project # 40-87-326 TREATMENT SYSTEM LOCATIONS January 17, 1991 Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 , DRAWN BY: D. Hada DATE: Nov. 16, 1991 REVIEWED BY: DATE: Groundwater Recovery/Vapor Extraction Well (6" casing) Exist ~g Grade -r~'~ PVC Casing 6" Schedule 4O (NOT TO SCALE) Typical Grounawa[er Recovery/Vapor JOB NUMBER ,~ ii..: ~tra¢l~on Woll 90-204 .: ¢onstruclion Dotails (4' Casing) FIGURE Groundwater Monitoring/Recovery/Vapor Extraction Well (4" casing) ~ Existing Grade ~i~' ~ N~ 4' Blarlk Scheclule 40 PVC Casing ~ Bemonite ~l~er. Pack ~ I Minimum 2" Annulus i 4' Schedule 40 O.020 Machine Slot .~ II PVC Well Screen 30' lqSnSnun I~ P¥C ca~ 10" D±orret:er l~re Hole ~.- ~,~ (NOT TO SCALE) Conceptual Groundwater Monitonng Wells JOB NUMBER ~x~,~ Construction Details (4" Casing) 90-204 · MW-11 2" PVC Pipe Vehicle Mounted 2 Horse Power Regenerative Blower Fresh Air Intake ~ Water -- Separator .Monitoring Well Blower Carbon Canisters Pilot Tube Air Flow r Flow DRAWN BY: REVIEWED BY: FIGURE 17 CONCEPTUAL PILOT TEST SYSTEM Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job No. 90-204 Ed Bernard DATE: October 3, 1991 DATE: ~ ~ I ~. -0.015 : 0.01 ~ ~M~-~ 1 : -, ~' ~- ~.OU~~ ::~~~]:::~:~::~":~~~ :::~::~'~**~::::~:*~*::~:~ "~ '~:::. - · · ~.~:~.:~ --::::~::: ~1 :' ,' ...... ~W- :::::::::::::::::::::::::::: '"~t:=%'~ ::::::::::::::::::::::::::::::::::::::::::::::::::::::::: / Co.fete Pad Treatment System ~ ~ , · ~ SVE Treatment System ~ _4 I~h Ou~ Wat~ O~e ~ To MW-3 _~_ Kemville Stage And Fre{ght O~n Lot Truck Parking Isobar Of -0.00055 psi Isobar Of -0.00036 psi LEGEND Monitoring Well Recovery Well Dry Well Appro~dmate Locations Of Existing/Groundwater Recovery System P~.pin~. Proposed SVE System Piping Proposed Extention of Groundwater Recovery System Piping Inferred Extent Of -0.00055 psi Pressure Drop During Pilot Test On MW-11. · Inferred Extent of -0.00036 psi Pressure Drop During Pilot Test On RW-1. MW-5_~ Pump Isiancts Building _~MW-16 Daves Oil Company Infil{ration Gallery (covered sulface) Approximate Scale 1" =50' 0 50 NOTE: Site Sketch After Site Vicinity Map By Delta Environmental Consultants Inc. Project # 40-87-326 January 17, 1991 AEGIS DRAWN BY: D. Hada REVIEWED BY: FIGURE 18 SOIL VAPOR PILOT TEST RESULTS RADII OF INFLUENCE, MW-11 & RW-1 Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. Job Number 90-204 DATE: January 30, 1992 DATE: PIERCE ROAD 1,100/30 on Jan. 10.1991 r'- -14 MW-13 Pa~'kang ~ ~._ND/2 on Jan. 10,1991 ~i: ~: i: ry ............. :: Cabe:-.x-~;.¥, , :?:i::~i~i~ ~ =========================== ~ I I Dry in Apdl, 1991 ~ (D ~ 1:3. Dry on Oct. 5, 1 , Storage ~ ':.MW-0:7' ~rea Q. And ~ I Dry in Marct3, 1990 [ I MW_8 ~F~ , ~i.e S~orage UW~~ I Dry on Oct. S. 1989 Teamsters Local Union No. 87 Rush Swoape Properties Abandoned Private Well Truck Wash iiiCummings] iii D esel I 4,000/5 March 13. 1989 Dry on Oct. 5, 1989 Not Analyzed __Dry""" MW- ILl LU t-- .-I ~ MW-2 =LH on Mar~:h 14. 1989 .~.~..~ MW-3 T~MW- 1 0 ~: ND/ND on~. Oct. 5, 1989 Dry m Marcrt, 1990 600/ND March 13. 1989 Dry on Oct. 5. 1989  ND/ND Jan, 10, 199!  Dry in April, 1991 '~' MW-16 Dares Oil Company NOTE: Site Sketch After Site Vicinity Map By Delta Environmental Consultants Inc. Project # 40-87-326 January 17. 1991 Ir~'filtration Gallery (covered surface) Approximate Scale 1" = 100' 0 100 4,000/5 March 13, 1989 Dry on Oct. 5, 1989 Monitoring Well Recovery Well Dry Well Approximate Locations Of Existing/Proposed Buried Utilities Not Found at Detection Limit Floating Liquid Hydrocarbons TPH as Gasoline/Benzene, Date (in parts-per-billion) Monitoring Event Date Measured Dry Well FIGURE 11 HISTORICAL OCCURANCE OF PETROLEUM HYDROCARBONS AND GROUNDWATER Davies Oil Company 3305 1/2 Gulf Street Bakersfield, Ca. AEGIS Job Number 90-204 :)RAWN BY: D. Heda DATE: Nov. 15, 1991 REVIEWED BY: DATE: TABLES TAttLE 1 ANALYTICAL RESULTS: SOIL DAVIES OIL COMPANY3305- Y~GULF STREET. BAKERSFIELD, CALIFORNIA (.NI results ~ pad~per-m~on) Sample Sample Date EDC EDB ID Depth Sampled Total Petroleum Aromatic Volatile Organics (Feet) Hydrocarbons Gasoline Diesel #2 Benzene Toluene Ethyl- Total benzene Xylenes B1 ~ 15 07/09/86 750 -- 3.3 30 -- 130 -- -- B2 ~ 13 07/10/86 <o.ool -- <o.ool < o.ool -- <o.ool -- -- B3~ 13.5 07/10/86 <o.oo~ -- <o.oot <o.om -- <o.ool -- -- B4~ 13.5 07/11/86 <o.oo~ -- <o.oot <o.ool -- <o.oo~ -- -- B5 ~ 5.0 05/05/87 < 1.o < ~oo < 4.o < t.o < 4.o < 4.o -- -- B5 ~ 12.5 05/05/87 < 1.o < lOO < t.o < t.o < 4.o < t.o -- -- B5; 17.5 05/05/87 131 1,150 8.2 4.0 1.3 ' 6.2 -- -- B6 ~ 11.5 05/05/87 < t.o < lOO < t.o < 4.o < t.o < 1.o -- -- B7~ 11.5 05/05/87' <to <too <4.0 <4.0 <4.0 <4.0 -- -- B81 14.0 05/05/87 <1.o <~oo <4.0 <1.o <4.0 <1.o -- -- B9~ 11.5 05/06/87 <1.o <too <4.0 <t.o <4.0 <4.0 -- -- MW-13 36 05/03/88 <o.t <0.4 <0.004 <o.ool <o.oot <o.oot <0,004 MW-14 36 05/03/88 <o.t <o.1 0.004 <o.ool <o.oot <o.ool <o.ool <o.om MW-15 36 05/03/88 <0.4 <o.1 < o.oot ' <o.ool <0.004 <o.oo4 <o.ool <o.oo~ MW-16 36 05/03/88 <o.t <0.4 <o.ool <o.ool <o.ool <o.ool <o.ool <o.om NOTES: < = 1 = 2 EDC = EDB = Below detection limits indicated, ,: : Not analyzed. : Samples collected by Twin City Testing (TCT) of St, Paul, Minnesota. TPH and BTEX performed by TCT. TPH as diesel perfomed by SMC Laborato~j in Bakersfield, Califomia. Groundwater was encountered at 16.5 feet below surface. TPH as gasoline and diesel, B'rEX by EPA 5020/8020 (AD). Samples collected by Delta Environmental Consultants, Inc., of Rancho Cordova, California. TPH as gasoline and diesel, and BTEX performed by Coast-to-Coast Analytical Services of San Luis Obispo, Califomia, 1,2-dichloroethane Ethylene dibromide. Aegis Environmental. Inc. February 19. 1992 PREVIOUS ANALYTICAL RESULTS: GROUNDWATER DAVIES OIL COMPANY 3305-~/~ GULF STREET, BAKERSFIELD, CALIFORNIA (All results in par~-per-billion) Monitoring Date Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons Gasoline Diesel Benzene Toluene Ethyl- Total benzene Xylenes MW-1 05/08/874 FLH FLH FLH FLH FLH FLH 10/22/87; FLH FLH FLH FLH FLH FLH 03/04/892 FLH FLH FLH FLH FLH FLH 03/14/892 FLH FLH FLH FLH FLH FLH March 1990 2 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well. April 1991 2 Dry well Dry well Dry well Dr~ well Dry well Dry well June 1991 ~ Dry well Dry well Dry well Dry well Dry well Dry well MW-2 07/11/86~ 11,000 m 400 310 < * 550 12/19/86~ 930 m 9 120 <* 330 05/08/87~ 4,100 <~.o 89 ~.s <~.~ 89 10/22/87~ ** 13,000 5 22 ~.o 12 03/05/882 1,300 ** 13 2 5 39 03/13/892 4,000 ** 5 20 4o 20 ' 10/05/892 Dry well Dry well Dry well Dry well Dry well Dry well March 1990 2 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 3 Dry well Dry well Dry well Dry well Dry well Dry well MW-3 07/11/86~ .6,100 -- 43 110 ' -- 170 05/08/87~ 354 6.2 0.9 ~.s ~.~ <~.~ 10/22/87~ 12,000 ** <~.o 3 I 10 03/05/88~ ** 29,000 <~.~ <~.o <~.o <~.o 03/13/89~ 600w ** <~.2 ~.o <=.o 10/05/892 Dry well Dry well Dry well Dry well Dry well Dry well March 1990 2 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 3 Dry well Dry well Dry well Dry well Dry well Dry well Aegis Environmental. Inc. February 19. 1992 TABLE 2 (CONTINUED) PREVIOUS ANALYTICAL RESULTS: GROUNDWATER DAVIES OIL COMPANY ~0~-½ GULF STREET, BAKER,I:IELD, CALJFOflNIA (All result~ In parts-per-billion) Monitoring Date Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons Gasoline Diesel Benzene Toluene Ethyl- Total benzene Xylenes MW-4 07/11/864 <* -- <* <* -- <* 05/08/87 ~ 22 q.o 1.8 7.6 ~.5 5.2 10/22/87~ <so ** 0.1 q.o q.o q.o 03/05/882 <so ** ,e.~ <~.o <~.o <~.o 03/13/892 <so ** 10/05/892 Dry well Dry well Dry well Dry_ .well Dry well Dry well March 1990 2 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 2 Dry well Dry well Dry well · Dry well Dry well Dry well June 1991 3 Dry well Dry well Dry well Dry well Dry well · Dry well MW-8 05/08/87 ~ 10/22/87~ <So ** <~.~ <~.o <~.o <~.o 03/04/8~ <so ** ~.~ <~.o q.0 <~.o 03/13/89' <so ** .e.2 <;.o q.o <~.o · 10/05/892 Dry well Dry well Dry well Dry well Dry well Dry well March 19902 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 ~ Dry well Dry well Dry well Dry well Dry well Dry well MW-9 05/08/87~ 33,400 <~.o 1,155 3,810 1,740 15,380 10/22/87~ 170,000 ** 10 1,600 2,200 37,000 03/04/882 70,000 ** 40 1,100 3,600 28,000 03/13/892 56,000 ** 31 120 2,200 11,000 03/13/892u 61,000 ** 33 130 2,300 14,000 10/05/892 Dry well Dry well Dry well Dry well Dry well Dry well March 19902 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 ~ Dry well Dry well Dry well Dry well Dry well Dry well Aegis Environmental. inc. February 19. 1992 TABLE 2 (CONTINUED) PREVIOUS ANALYTICAL RESULTS: GROUNDWATER DAVIES OIL COMPANY 3305-½ GULF STREET, BAKERSFIELD, CAUFORNIA (Ail results In para-per-billion) Monitoring Date Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons Gasoline Diesel Benzene Toluene Ethyl- Total benzene Xylenes MW-10 03/04/88~ ,~o ** 2.2 <~.0 ~.o 2.0 03/13/89~ <~o ** ~.2 ~.o ~.o ~.o 10/05/89; <~o ** ,~.~ <~.o <~.o ,~.o March 1990 2 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 3 Dry well Dry well Dry well Dry Well Dry well Dry well MW-11 03/04/88~ 240,000 ** 10,000 89,000 3,200 37,000 03/13/89~ FLH FLH FLH FLH FLH FLH 10/05/89~ FLH FLH FLH FLH FLH FI.H March 1990 2 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 ~ Dry well Dry well Dry well · Dry well Dry well Dry well June 1991 3 Dry well Dry well Dry well Dry well Dry well Dry well MW-12 03/05/88~ 100,000 ** 600 4,200 3,700 42,000 03/05/88~= 70,000 ** 900 5,600 2,300 29,000 03/13/89~ FLH FLH FLH FLH FLH FU'I 10/05/89~ FLH FLH FLH FLH FLH FLH March 1990 2 Dry well Dry well Dry well Dry well Dry well Dry well 01/11/912 Dry well Dry well Dry well Dry well Dry well Dry well April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 3 Dry well Dry well · Dry well Dry well Dry well Dry well Aegis Environmental, Inc. February 19. 1992 TABLE 2 (CONTINUED) PREVIOUS ANALYTICAL RESULTS: GROUNDWATER DAVIES OIL COMPANY 3305-t/~ GULF STREET, BAKERSFIELD, CAMFORNIA (All results In parts-per-billion) Monitoring Date Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons Gasoline Diesel Benzene Toluene Ethyl- Total benzene Xylenes MW-13 01/10/912 <50 <50/<~0 2 1.2 1.2 0.8 April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 3 Dry well Dry well Dry well Dry well Dry well Dry well MW-14 01/10/912 1,100 <50/<I~0 30 3.6 42 32 April 1991 2 Dry well Dry well Dry well Dry.well Dry well Dry well' June 1991 ~ Dry well Dry well Dry well Dry well Dry well Dry well MW-15 01/10/912 <50 <50/<~0 1.5 1.1 1.0 0.5 April 1991 2 Dry well Dry well Dry well Dry well Dry well Dry well June 1991 3 Dry well Dry well Dry well Dry well Dry well Dry well MW-16 01/10/912 <50 <50/<~0 <0.1 <0.5 <0.5 <0.5 April 1991 2 ...... June 1991 3 ...... NOTES: -- w s 1 = Not analyzed/Notreported. = Analytical laboratory detection limit unknown. = Constituent not detected when running analysis. = Weathered. = Analyzed for crude oil, jet fuel, kerosene, and Stoddard solvents. = Samples collected by TCT of St. Paul, Minnesota, and analyzed by SMC Laboratory of Bakersfield, California. Laboratory method unknown. 2 = Samples collected by Delta Environmental, Consultants, Inc., of Rancho Cordova, California, and analyzed by Coast-to-Coast Analytical Services of San Luis Obispo, California. 10/22/87- TPH-G, TPH-D, and BTEX analyzed by EPA Method 524.2. 03/05/88- TPH-G, TPH-D, and BTEX analyzed by EPA Method 8260/5030. 03/13/89and 10/05/89- TPH-G, TPH-D, and BTEX analyzed by EPA Method 8260/5030. 01/10-11/91 - TPH-G; TPH-D; TPH as crude oil, jet fuel, kerosene, Stoddard solvent; and BTEX by CAI. DHS Draft TPH (modified) and EPA 8240/5030. 3 = Samples collected by Aegis Environmental, Inc., of Roseville, California. FLH = Floating liquid hydrocarbons. Ethylene dibromide and 1,2-dichloroethane were below analytical laboratory detection limitsfor all sampling events. Aegis Environmental, Inc. February 19. 1992 TABLE 3 UQUID LEVEL DATA DAVIES OIL COMPANY3305- Y~GULF STREET, BAKERSFIELD, CALIFORNIA (Messuremeots in feet) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)~ Groundwate~ Elevation~ Product MW-1 07/11/86~ 409.33" 14.86 394.47' 0.33 05/08/874 18.23 391.29' 0.50 10/22/87~ 19.72 389.86' 0.06 12/03/874 20.66 389.05' 0.80 03/04/884 19.09 390.28' 0.25 05/02/882 21.24 388.72' 0.20 11/02/882 22.83 386.50 sheen 01/13/892 19.93 389.40 03/13/892 20.22 389.11 06/26/892 dry dry 10/25/892 dry dry 11/09/892 dry dry 01/04/90~ dry dry 02/07/902 dry dry 05/31/902 dry dry 07/25/902 . dry dry 08/16/90~ dry dry 01/11/912 dry dry April 1991 2 dry dry June 19913 dry ~: ' ~. dry Aegis Environmental, Inc. February 19. 1992 TABLE 3 (CONTINUED) UQUID LEVEL DATA DAVIES OIL COMPANY3305- ~, GULF STREET, BAKERSEIELD, CALIFORNIA (Measurements ~ fe~) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)a Groundwate~ Elevationa Product MW-2 07/11/86~ 409.31" 15.02 394.29 05/08/871 17.87 391.44 sheen 10/22/87~ 19.35 389.96 12/03/871 20.43 388.88 odor 03/04/88~ 19.07 390.24 05/02/882 20.70 388.61 odor 11/02/882 22.79 386.52 01/13/892 20.04 389.27 odor 03/13/892 20.45 388.86 06/26/892 dry dry 10/25/892 dry dry 11/09/892 dry dry 01/04/902 dry dry 02/07/902 dry dry 05/31/902 dry dry 07/25/902 dry dry 08/16/902 dry dry 01/11/912 dry dry April 1991 2 dry dry June 19913 dry dry Aegis Environmental, Inc. February 19, 1992 TABLE 3 (CON'nNUED) UCIUID LEVEL DATA DAVIES OIL COMPANY3305- Y~GULF STREET, BAKERSFIELD, CAUFOflNIA (Measurements in feet) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing}= ~roundwater Elevationa Product MW-3 07/11/86~ 410.22" 15.37 394.85 o5/o8/87~ 18.34 391.88 10/22/87~ 20.00 390.22 12/03/87~ 20.77 389.45 03/04/88~ 19.42 390.80 05/02/882 21.10 389.12 11/02/882 22.86 387.36 01/13/892 20.20 390.02 03/13/892 20.77 389.45 06/26/892 dry dry 10/25/892 dry dry 11/09/892 dry dry 01/04/902 dry dry 02/07/902 dry dry 05/31/902 dry dry 07/25/902 dry dry, 08/16/902 dry dry~ 01/11/912 dry dry April 1991 2 dry dry June 19913 dry dry Aegis Environmental. Inc. February 19. 1992 TABLE 3 (CONTINUED) UQUID LEVEL DATA DAVIES OIL COMPANY3305- ~ GULF STREET, BAKERSFIELD, CALIFORNIA (Measurements in fee~) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)a Groundwate~ Elevationa Product MW-4 07/11/86~ 409.72" 15.06 394.66 05/08/87~ 17.87 391.85 10/22/87; 18.46 391.26 12/03/87~ 20.41 389.31 03/04/88 ~ 19.03 390.69 05/02/882 20.58 389.14 11/02/882 22.50 387.22 01/13/892 20.08 389.64 03/13/892 20.30 389.42 06/26/892 dry dry 10/25/892 dry dry 11/09/892 dry dry 01/04/902 dry dry 02/07/902 dry dry 05/31/902 dry dry 07/25/902 dry dry 08/16/902 dry dry 01/11/912 dry dry April 1991 2 dry dry June 19913 dry dry Aegis Environmental, Inc. February 19, 1992 TABLE 3 (CONTINUED) UQUID LEVEL DATA DAVIES OIL' COMPANY3305-Y~GULF STREET, BAKERSFIELD, CAMFORNIA (Measurements in fee~) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)~ Groundwate~ Elevationa Product MW-5 03/13/892 407.62" 18.32 389.30 06/26/892 21.79 385.83 10/25/892 NM NM 05/31/902 dry dry 07/25/902 dry dry 08/16/902 dry dry 01/11/912 dry dry April 1991 2 dry dry June 1991 3 dry dry MW-8 05/08/87~ 409.68" 18.00 391.68 10/22/87~ 19.60 390.08 12/03/871 20.60 389.08 03/04/88~ 19.27 390.41 05/02/882 NM NM 11/02/882 dry dry 01/13/892 .dry dry 03/13/892 20.70 388.98 06/26/892 dry dry 10/25/89 2 dry dry 11/09/892 dry =:'~ dry 01/04/902 dry dry 02/07/902 dry dry 05/31/902 dry dry 07/25/902 dry dry 08/16/902 dry dry 01/11/912 dry dry April 1991 2 dry dry June 19913 dry dry Aegis Environmental, Inc. February 19. 1992 TABLE 3 (CONTINUED) UQUID LE'-~EL DATA DAVIES OIL COMPANY3305- Y~GULF STREET~ BAKERSFIELD, CALIFORNIA (Measurements in feet) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)a Groundwate~ Elevationa Product MW-9 05/08/87~ 406.60" 15.37 391.23 10/22/874 17.38 389.22 sheen 12/03/87 ~ 18.12 ' 388.48 03/04/884 16.70 389.90 odor 05/02/882 18.26 388.34 11/02/882 dry dry 01/13/892 17,87 388.73 03/13/892 18.20 388.40 odor 06/26/892 dry dry 10/25/892 dry dry 11/09/892 dry dry 01/04/902 dry dry 02/07/902 dry dry 05/31/902 dry dry 07/25/902 dry dry 08/16/902 dry dry 01/11/912 dry dry April 1991 2 dry dry June 19913 dry dry MW-10 03/04/884 408.12" 17.52 390.60 05/02/882 11/02/882 19.28 388.84 01/13/892 21.00 387.12 03/13/892 18.36 ~ ~ 389.76 06/26/892 18.82 ~ 389.30 10/25/892 22.52 385.60 11/09/892 23.20 384.92 01/04/90~ 24.53 383.59 02/07/902 26.42 381.70 05/31/902 27.09 381.03 07/25/902 .dry dry 08/16/902 dry dry 01/11/912 dry dry April 1991 2 dry dry dry dry dune 19913 dry dry Aegis Environmental, thc. February 19, 1992 TA~iLE 3 (CONTINUED) UQUID LEVEL DATA DAVIES OIL COMPANY,3305- ~GULF SIREET'. BAKERSFIELD. CALIFORNIA (Measurements in feet) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)a Groundwate~ Elevations Product MW- 11 03/04/88~ 409.43.' 19.23 390.20 odor 05/02/882 20.78 388.65 11/02/882 23.57 386.42' 0.75 01/13/892 20.62 389.19' 0.50 03/13/892 20.63 389.03' 0.30 06/26/892 24,37 385.07' 0.01 10/25/892 25.95 384.25. 1.02 11/09/892 dry dry odor 01/04/902 dry dry odor 02/07/902 dry dry odor 05/31/902 dry dry odor 07/25/902 dry dry odor 08/16/902 dry dry odor 01/11/912 dry dry April 1991 2 dry dry June 19913 dry dry MW-12 03/04/88~ 408.67" 18.62 390.05 odor 05/02/882 20.16 388.51 odor 11/02/882 22.86 386.19' 0,50 01/13/892 19.81 389.01' 0.20 03/13/892 20.02 388.73' 0.10 06/26/892 24.54 384.84' 0.94 10/25/892 25.39 ,: ~ 384.05' 1.02 01/04/902 26.60 : 383.08' 1.35 02/07/902 dry dry odor 05/31/902 dry dry odor 07/25/902 dry dry odor 08/16/902 dry dry odor 01/11/912 dry dry odor April 1991 2 dry dry June 1991 3 dry dry MW-13 01/11/912 409.91 36.62 373.29 April 1991 2 dry dry June 19913 dry dry Aegis Environmental. Inc. February 19. 1992 TABLE 3 (CONTINUED) UQUID LEVEL DATA DAVIES OIL COMPANY, 330~ I~GULF STREET, BAKERSFIELD, CALIFORNIA (Measurements in feet) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)a Groundwate~ Elevationa Product MWo14 01/11/912 408.63 36.31 372.32 April 1991 2 dry dry June 1991 ~ dry dry MW-15 01/11/912 409.78 36.35 373.43 April 1991 2 dry dry June 1991 ~ dry dry MW-16 01/11/912 410.52 32.35 378.17 April 1991 2 NM NM NM June 1991 ~ NM NM NM Aegis Environmental, Inc. February 19, 1992 TABLE 3 (CONTINUED) UQUID LEVEL DATA DAVIES OIL COMPANY, 3305- Y~GULF STREET; BAKERSFIELD, CALIFORNIA (Measurements in feet) Reference Monitoring Elevation Depth-to- Groundwater Free Well Date (top of casing)a Groundwaterb Elevationa Product RW-1 11/02/882 410.09 23.91 385.99 0.25 01/13/892 20.82 389.12 0.20 03/13/892 21.15 388.93 0.01 07/02/892 · 410.34 2 7.69 382.65 07/31/892 28.55 381.79 08/24/892 29.64 380.70 09/07/892 29.10 381.24 10/25/892 30.22 380.12 11/08/892 30.71 379.63 12/08/892 30.50 379.84 01/04/902. 31.55 378.79 02/07/902 31.65 378.69 02/19/902 30.31 380.03 05/31/902 33.10 377.24 odor 07/25/902 34.50 375.84 odor 08/16/902 35.10 375.24 odor 01/11/912 dry dry April 1991 2 dry dry June 19913 dry dry NOTES: CDTW DTW SP.G LHT dry NM RW MW All elevations referenced to the bench mark located near fence comer at the northeastend of Gulf Street, The bench mark is a white wood post, elevation 409,50 feet above mean sea level. The well elevations were surveyed by Delta Environmental Consultants, Inc. (Delta), on May2, 1988. Measurement and reference elevation taken from mark on north top side of well casing. Data collected by Twin City Testing. Original elevation referenced to side nut of the hydrant on Gulf Street with an assumed elevation set at 100.00 feet surveyed by Twin City Testing. Measurements collected by Delta. Measurements collected by Aegis Environmental, Inc., of Roseville, California. Corrected groundwater elevation = CDTW = DTW - (SP.G x LHT). Corrected depth-to-water. Measured depth-to-water. Specific gravity and unweathered gasoline = 0.75, diesel = 0.80. Measured liquid hydrocarbon thickness. Delta resurveyed the well elevations using the bench mark, a white wood post, elevation 409.50 feet above MSL. The well elevations were surveyed by Delta on May2, 1988. The groundwater elevations collected by Twin City Testing were recalculated using Delta's survey of May 2, 1988. No groundwater present in well. Not measured. Recovery well. Monitoring well. Aegis Environmental. Inc. February 19. 1992 APPENDIX A STANDARD OPERATING PROCEDURES AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURES RE: SOIL BORING SAMPLING ' SOP-1 Soil samples for chemical analysis are collected in thin-walled brass tubes, 4- or 6-inches long by 2-inches outside diameter. Three or four of the tubes, plus a spacer tube, are set in a 2-inch inside diameter 18-inch split-barrel sampler. Where possible, the split-barrel sampler is driven its entire length either hydraulically or using a 140-pound drop hammer. The sampler is extracted fromm the borehole and the brass tubes, containing the soil samples, are removed. Upon removal from the sampler, the selected brass tubes are immediately trimmed and capped with either aluminum foil or Teflon sheets and plastic caps. They are then hermetically sealed with duct tape, labeled and refrigerated for delivery, under strict chain-of-custody, to the analytical laboratory. These procedures minimize the potential for cross-contamination and volatilization of volatile organic compounds (VOC) prior to chemical analysis. One soil sample collected at each sampling interval is analyzed in the field using either a portable photoionization detector (PID), flame ionization detector, organic vapor analyzer, catalytic gas detector or an explosimeter. The purpose of this field analysis is to qualitatively determine the presence or absence of hydrocarbons, and the samples to be analyzed at the laboratory. The soil sample is sealed in either a brass tube, glass jar or plastic bag to allow for some volatilization of VOC. The PID is then used to measure the concentrations of hydrocarbons within the containers's head space. The data is recorded on both field notes and the boring logs at the depth corresponding to the sampling point. Other soil samples are collected to document the soil and/or stratigraphic profile beneath the project site, and estimate the relative permeability of the subsurface materials. All drilling and sampling equipment are either steam-cleaned or washed in trisodium phosphate solution and double-rinsed in deionized water prior to use at each site and between boreholes to minimize the potential for cross-contamination. ATi"ACH M ENT/SOP-1/June 1990 AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURES RE: SOIL CLASSIFICATION SOP-3 Soil samples are classified according to the Unified Soil Classification System (USCS). Representative portions of the samples may be shipped under strict chain-of-custody to an analytical laboratory for further examination and verification of the in-field classification, and analysis of soil mechanical and/or petrophysicai properties. The soil types are indicated on logs of either excavations or borings together with depths corresponding to the sampling points, and.other pertinent information ATTACH M ENT/SOP-3/June 1990 AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURES RE: SAMPLE IDENTIFICATION AND CHAIN-OF-CUSTODY PROCEDURES SOP-4 Sample identification and chain-of-custody procedures ensure sample integrity, and document sample possession from the time of collection to its ultimate disposal. Each sample container submitted for analysis is labeled to identify the job number, date, time of sample collection, a sample number unique to the sample, any in-field measurements made, sampling methodology, name(s) of on site personnel and any other pertinent field observations also recorded on the field excavation or boring log.. Chain-of-custody forms are used to record possession of the sample from time of collection to its arrival at the laboratory. During shipment, the person with custody of the samples will relinquish them to the next person by signing the chain-of-custody form(s) and noting the date and time. The sample-control officer at the laboratory will verify sample integrity, correct preservation, confirm collection in the proper container(s) and ensure adequate volume for analysis. If these conditions are met, the samples will be assigned unique laboratory log numbers for identification throughout analysis and reporting. The log numbers will be recorded on the chain-of-custody forms and in the legally-required log book maintained in the laboratory. The sample description, date received, client's name and any other relevant information will also be recorded. AT~'ACH MENT/SOP-4/June 1990 I AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURES RE: LABORATORY ANALYTICAL QUALITY ASSURANCE AND CONTROL SOP-5 In addition to routine calibration of the analytical instruments with standards and blanks, the laboratory analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: U.S. Environmental Protection Agency (EPA) and State certification programs; Participation in an inter-laboratory or "round-robin" quality assurance program; o Verification of results with an alternative method. For example, calcium may be determined by atomic absorption, ion chromatography, or titrimetric methods. Volatile organic compounds may be determined through either purge and trap or liquid-liquid extraction methods; and, ,. Miscellaneous checks of equipment accuracy. Where trace analysis is involved, purity of the solvents, reagents and gases employed is of great concern. The laboratory maintains a service contract on all major instrumentation, including gas chromatograph, atomic absorption, ion chromatography and total organic carbon analyzers. Each of these instruments are serviced and maintained regularly. ATTACH M ENT/$OP-5/June 1990 AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURE RE: HOLLOW-STEM AUGER MONITORING WELL INSTALLATION AND DEVELOPMENT SOP-6 Boreholes for monitoring wells are drilled using a truck-mounted hollow-stem auger drill rig. The borehole diameter will be a minimum of four inches larger than the outside diameter of the casing when installing well screen. The hollow-stem auger provides minimal interruption of drilling while permitting soil sampling at desired intervals. Soil samples are collected by either hammering or hydraulically pushing a conventional split- barrel sampler containing pre-cleaned 2-inch diameter brass tubes. A geologist or engineer from Aegis Environmental, Inc. continuously logs each'iborehole during drilling and constantly checks drill cuttings for indications of both the first occurrence of groundwater and volatile hydrocarbons using either a portable photoionization detector (PID), flame ionization detector or an explosimeter. The sampler is rinsed between samples and either steam cleaned or washed with all other drilling equipment between borings to minimize the potential for cross-contamination. Monitoring wells are cased with threaded, factory-perforated and blank Schedule 40 PVC. The perforated interval consists of slotted casing, generally with 0.020-inch wide by 1.5- inch long slots, with 42 slots per foot. A PVC cap may be secured to the bottom of the casing with stainless steel screws; no solvents or .cements are used. Centering devices may be fastened to the casing to assure even distribution of filter material and grout within the borehole annulus. The well casing is thoroughly washed and/or steam cleaned, or may be purchased as pre-cleaned, prior to installation. After setting the casing inside the hollow-stem auger, sand or gravel filter material is poured into the annular space to fill from boring bottom to generally 1 foot above the perforated interval. A 1- to 2-foot thick bentonite plug is set above this filter material to prevent grout from infiltrating into the filter pack. Either neat cement, containing about 5% bentonite, or sand-cement grout is then tremmied into the annular space from the top of the bentonite plug to near surface. A traffic-rated vault is installed around each wellhead for wells located in parking lots or driveways, while steel "stovepipes" are usually set over wellheads in landscaped areas. After installation, the wells are thoroughly developed to remove residual drilling materials from the wellbore, and to improve well performance by removing fine material from the filter pack that may pass into the well. Well development techniques used may include pumping, surging, bailing, swabbing, jetting, flushing and air-lifting. All development water is collected either in drums or taF~ks for temporary storage, and properly disposed of depending on laboratory analytical results. To minimize the potential for cross- contamination between wells, all development equipment are either steam cleaned or properly washed prior to use, ATTACH MENT/SOP-6/June 1990 AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURE RE: GROUNDWATER PURGING AND SAMPLING SOP-7 Prior to water sampling, each well is purged by evacuating a minimum of three well-bore volumes of groundwater. When required, purging will continue until either the discharge water temperature, conductivity or pH stabilize, a maximum of ten well-bore volumes of groundwater have been recovered or the well is bailed dry. When practical, the groundwater sample shoUld be taken when the water level in the well recovers to at least 80% of its static level. The sampling equipment consists of either a Teflon bailer, PVC bailer or stainless steel bladder pump with a Teflon bladder. If the sampling system is dedicated to the well, then the bailer is usually Teflon, but the bladder pump is PVC with a polypropylene bladder. In general and depending on the intended laboratory'analysis, forty-milliliter (mi) glass, volatile-organic-analysis (VOA) vials, with Teflon septa, are used as sample containers. The groundwater sample is decanted into each VOA vial in such a manner that there is no meniscus at the top of the vial. A cap is quickly secured to the top of the vial. The vial is then inverted and gently tapped to see if air bubbles are present. If none are present, the vial is labeled and refrigerated for delivery, under strict chain-of-custody, to the analytical laboratory. Label information should include a unique sample identification number, job identification number, date, time, type of analysis requested and the sampler's name. For quality control purposes, a duplicate water sample is collected from each well. This sample is put on hold at the laboratory. When required, a trip blank is prepared at the - laboratory and placed in the transport cooler. It is labeled similar to the well samples, remains in the cooler during transport and is analyzed by the laboratory along with the groundwater samples. In addition, a field blank may be prepared in the field when sampling equipment is not dedicated. The field blank is prepared after a pump or bailer has been either steam cleaned or' properly washed, prior to use in the next well, and is analyzed along with the other samples. The field blank analysis demonstrates the effectiveness of the in-field cleaning procedures to prevent cross-contamination. To minimize the potential for cross-contamination between wells, all well development and water sampling equipment not dedicated to a well is either steam cleaned or properly washed between use. As a second precautionary measure, wells are sampled in order of least to highest concentrations as established by available previous analyses. ATTAC HMENT/$OP-7/June 1990 APPENDIX B SITE SAFETY PLAN FIELD INVESTIGATION TEAM SITE HEALTH AND SAFETY PLAN A. GENERAL INFORMATION Client: Davies Oil Company Aegis Project Number: 90-204 Site Name: Davies Oil Company Client Project Number: NA Street Address: 3305-1/2 Gulf Street, Bakersfield, California Plan Prepared by: Duane Garrabrant Approved by: Mark A. Richards Revised by:. Revision Approved by: Objectives: Phase I - Phase II - Phase III - Date: Date: Date: Date: February 14, 1992 February 14, 1992 Monitoring/recovery well installation. Operate site remediation systems. Proposed Date of Investigation: March 1992. Hazard Summary/Level' of Protection A: B: C: D: X (with modifications) 90-204A. H&S 1 B. SITE/WASTE CHARACTERISTICS Waste/Contaminant Type(s): X Liquid X Soil Characteristic (s) :~ Corrosive X .Ignitable X Volatile X Toxic __ Unknown __Other (Name): Contaminant Sour~ce (type and location): Leak from underground gasoline pipe line. Solid Sludge Radioactive Reactive Gas Surrounding Features: Industrial/commercial area. Status (active, inactive, unknown): active. History (worker or non-worker injury; complaints from public; previous agency action): 90-204A. H& 5 2 C. HAZARD EVALUATION Have all contaminants been identified that may be present on site? Yes X No List all chemicals below that have been identified or are suspected on site and their maximum concentrations in soil/water. Information on hazardous properties are listed in the appendix. For chemicals not shown in the appendix, enter the hazardous property information in the spaces provided. Chemical Name Maximum Concentration: (ppm) In Soil In Water Benzene 8.2 -" 10 Toluene 30 89 Ethylbenzene 1.3 3.7 Xylenes 130 42 Lead Unknown Unknown (ppm) = parts-per-million Free product present? Type of product present: X Yes X Leaded No X Unleaded X Diesel 90-204A.H&S 3 D. SITE SAFETY WORKPLAN Team Member Mark A. Richards Mark A. Richards Mark A. Richards PERIMETER ESTABLISHED Map/Sketch Attached? Site Secured? Perimeter Identified? Zero line defined? Free Product? Dissolved Product? PERSONNEL Title Project Manager Geologist Geologist Responsibility Site Coordinator Project Geologist Site Safety Officer Yes X No Yes X No Yes X No Yes No X Yes X No Yes X No INVESTIGATION-DERIVED MATERIAL DISPOSAL: Soil and water from investigatiwe activities will be stockpiled and stored on site until analyses are available to describe the levels of petroleum hydrocarbon and lead constituents contained in them. Soil stockpiled on site will be underlain by and covered with plastic sheeting. Water from development of wells will be stored on site in Department of Transportation approved barrels. Any material disposed off site will be disposed of in accordance with existing regulation and guidelines. 90-204A. H&$ 4 D1. SITE ENTRY PROCEDURES: PERSONNEL PROTECTION: Level of protection: A__ Modifications: 1. PERSONAL SAFETY B C D X Ail personnel must wear hard hat, safety shoes, safety glasses and/or face shield. Neoprene gloves and tyvek/saranax suit should be worn if contact with contaminated water or soil is likely. Hearing protection mUst be worn if noise levels prevent normal conversation at a distance of three feet. No smoking, eating, or drinking is allowed on.site. Respiratory protection is dependent on conditions listed in next section. No personnel are to enter or approach any excavation area where there is a danger of wall collapse or confined space entry. Surveillance Equipment and Materials: Action Level InstrUmentation 5 units or 5 times background (breathing zone) 1,000 ppm photoionization detector (hNu) <19.5% oxygen oxygen meter >10% LEL >20% LEL explosimeter Action use halfmask respirator with organic cartridges eliminate all ignition sources, leave site until levels are reduced do not enter area or confined space until levels are reduced. eliminate all ignition sources reduce levels immediatly or leave. site. 90-204A. H&$ 5 First Aid Equipment: Standard first aid kit, portable eye wash. First Aid Procedures: Ingestion: DO NOT induce vomiting, summon medical help. Inhalation: Move victim to fresh air, seek medical attention if needed. Dermal Exposure: Remove contaminated clothing, flush with water. DECONTAMINATION PROCEDURE: Personnel: Flush exposed skin with soap and water. WORK LIMITATIONS:(time of day, weather, heat/cold stress): In high ambient temperatures, follow heat-stress precautions: Provide plenty of cool water and electrolytes (e.g., Gatorade), remove protective clothing during breaks; check resting pulse and increase number of breaks if pulse does not return to normal during work break. In cold ambient temperatures (<0°F.), follow hypothermia precau- tions. Work may only progress during daylight hours or under conditions of adequate lighting. ELECTRICAL HAZARDS: Will be located by U.S.A. before drilling. Maintain at least 10 feet clearance from overhead power lines. If unavoidably close to overhead or buried power lines, turn power off and lockout circuit breaker. Avoid standing in water when operating electrical equipment. CONFINED SPACES: Monitor organic vapors and oxygen before entering. If the following values are exceeded, do not enter. 1. Oxygen < 20.0%. 2. Total hydrocarbons > 5 ppm above background, if all air contaminants have not been identified. 3. Concentrations of specific air contaminants exceeding action levels in Section D, if all air contaminants have been identified. If entering a confined space, monitor oxygen and organic vapors continuously. AGENCIES CONTACTED IN UNDERGROUND UTILITY SEARCH: Underground Service Alert 90-204A.H&S 6 E. EMERGENCY INFORMATION LOCAL TELEPHONE NUMBERS (provide.area codes): Ambulance Hospital Emergency Room Poison Control Center Fire Department Airport (Kern County on Airport Drive) Explosives Unit 911 805-327-1792 (Memorial Hospital) 800-346-5922 911 805-393-7977 911 SITE RESOURCES: Water supply available on site: Telephone available on site: Bathrooms available on site: Other resources available on site: If yes, identify: Electricity. Yes X NO Yes X N~ Yes X No Yes X No If you answered "no" to any of the above questions, identify the closest available facility, and provide directions. EMERGENCY CONTACTS 1. Project Manager: Mark A. Richards 2. Health and Safety Officer: Mark A. Richards 3. Site Contact: Bill Davies 4. Regulatory Contact: Dolores Gough PHONE NO. 916-782-2110 916-782-2110 805-323-6063 805-861-3636 S0-204A,H& S 7 F. EMERGENCY ROUTES (Give name address, telephone number, directions, distance and time estimate, and map.) HOSPITAL: Memorial Hospital Northeast corner 34th and San Dimas Streets 805-327-1792 DIRECTIONS: West on Gulf Street to Pierce Street North on Pierce Street to Highway 204 Southeast on Highway 204 (Golden State Highway) to Chester Avenue North on Chester Avenue to 34th Street East on 34th Street to San Dimas' Distance: Travel time: Approximately 3.5 miles. Approximately 15 minutes. G. HAZARD EVALUATION TLV OT IDLH VOLA- SKIN PARAMETER (ppm) (ppm) (ppm) .TILITY HAZARD Benzene 0.1 4 2,000 H L Ethylbenzene 100 NS 2,000 M L Toluene 100 2 2,000 M L Xylene 100 <1 10,000 H M Gasoline 300 NS NS H L EXPLO- SIVITY H H H H H KEY: TLV = Threshold Limit Value (Worker - 8 H0~rs) OT = Odor Threshold '~' DLH = Immediately Dangerous to Life and Health NS = None Specified NR = Not Reported H = High M = Medium L = Low U = Unknown 90-204A. H&$ 9 HAZARDOUS PROPERTY INFORMATION - VOLATILE ORGANIC PRIORITY POLLUTANTS (CONTINUED) Flash Odor Threshold Accute' ~ater' Specific Vapor Point Vapor~ LEL LO~ IDLH or ~arning HazardJ DermalK Exposure Material Solubility Gravity Density °F Pressure UEL mg/k; TLV-TUA' Level Concentration Property Toxicity S~npt~,~ 1,1-Oich[oroethane 0.1 g 1.1757 8.4 22 182 mm 6.0% 725 100.0 ppm' 4,000 ppm 5 ppm BCD ABH]MNO (DCA) 1,2-Dich[oroethane 0.8% 1.2554 3.4 55 8?mm 6.2% 6?0 10.0 ppm" 1,000 ppm 6 ppm BCDG BCFGL#NQ 16.0% 1,1-Dichtoroethy[ene 2250 mg/[ -- 3.4 3 591 mm 7.3% 200 5.0 ppm" none BCD B[MN (DCE) a T~'F 16.0% specified Trans-l,2-Dich[oroethy[ene slightly 1.2565 -- 36 400 mm 9.7~ none none .0043 mg/[ BCD ABFILO0 soluble 12.8% established specified 1,2 Dichtoropropane 0.26% 1.1583 3.9 60 40 mm 3.4% 1900 75.0 ppm 2,000 ppm 50 BCD ABGHIIO4N 14.5% Q Cis-l,3-Dichtoropropane insoluble 1.2 3.8 83 28 mm 5.0% 250 1.0 ppm" none BCD ABGHIKLM 14.5% specified NP Trans-l,3-Dichtoropropane insoluble 1.2 · 3.8 83 28 mm 5.0% 1.0 ppm" none BCD ABGHIKLN 14.5% specified NP Ethylbenzene 0.015 g 0.86? 3.7 59 1.1 mm 1.0% 3500 100.0 ppm 2,000 ppm 0.25-200 BCD CIF ABFHIKLM / 6.7'~ (200) HPQR Methylene Chloride slightly 1.335 2.9 none 350 mm 12.0%~ 167 100.0 ppm" 5,000 ppm 25-320 CED ClF BClKLMNP soluble unavailable (5000) R 1,1,2,2-Tetrachtoroethane 0.19~ 1.5953 5.8 none 5 mm non- 1.0 ppm" 150 ppm 3-5 CD ABCFHIKL ftam. MNOQ Tetrachtoroethytene 0.15 g/mt 1.6227 5.8 none 15.8 mm non- 8850 50.0 pp~" 500 Rom 4.68-50 CD ACFHIKLM fram. (160-690) NP 1,1,1-Trich[oroethane 0.07 g 1.3390 4.6 none 100 mm 8.0%c 10300 350.0 ppm 1,000 ppm: 20-400 BCED ASEFHIKL (TCA) 10.5% (500-1000) HOP 1,1,2-Trichtoroethane 0.45 1.4397 4.6 none 19 mm 6.0%~ 1140 10.0 ppm 500 ppm 0 C BEFG~IKL 15.5% MNC~ APPENDIX Az ~AZARDOUS PROPERTY INFORMATION Explanations and Footnotes Water solubility is expressed in different terms in different references. M~ny references use the term "insoluble" for materials that will not readily mix with water, such as gasoline. However, most of these materials are water soluble at the part per millon or part per billion level. Gasoline for example, is insoluble in the gross sense, and will be found as a discreet layer on top of the ground water. But certain gasoline constituents, such as benzene, toluene, and xylene will also be found in solution in the ground water at the part per millon or part per billion level. ae Be Water solubility expressed as 0.2g means 0.2 grams per 100 grams water at 20°C. Solubility of metals depends on the compound in which they are present. Ce Several chlorinated hydrocarbons exhibit no flash point in conventional sense, but will burn in presence of high energy ignition source or will form explosive mixtures at temperatures above 200°F. D. Practically non-flammable under standard conditions. E. Expressed as mm Hg under standard conditions Fe Explosive concentrations of airborne dust can occur in confined areas. Values for Threshold Limit Value - Time Weighted Average (TLV-TWA) are OSHA Permissible Exposure Limits (PEL) except where noted in H. and I. He TLV - TWA adopted by the American Conference of Government Industrial Hygienists (ACGIH) which is lower than the OSHA PEL. TLV - TWA recommended by the National Institute for Occupational Safety and Health (NIOSH). A TLV or PEL has not been adopted by the ACGIH or OSHA. Je A. - Corrosive B. - Flammable C. - Toxic D. - Volatile E. - Reactive F. - Radioactive G. - Carcinogen H. - Infectious K. - Dermal Toxicity data is summarized in the following three categories: 90-204A.H&S 10 Skin penetration A - negligible penetration (solid-polar) B - slight penetration (solid-nonpolar) C - moderate penetration(liquid-nonpolar) D - high penetration (gas/liquid-nonpolar) Systemic Potency E - slight hazard - LDs0 = 500-15,000 mg/kg lethal dose for 70 kg man = l'pint-1 quart F - moderate hazard - LDs0 = 50-500 mg/kg lethal dose for 70 kg man = 1 ounce-1 pint G - extreme hazard - LDs0 = 10-50 mg/kg lethal dose for 70 kg man = drops to 20 ml Local Potency .... H - slight - reddening of skin I - moderate - irritation/inflammation of skin J - extreme - tissue destruction/necrosis 1. Acute EXPosure Symptoms A - abdominal pain B - central nervous system depression C - comatose D - convulsions E - confusion F - dizziness G - diarrhea H - drowsiness I - eye irritation J - fever K - headache L - nausea M - respiratory system irritation N - skin irritation O - tremors P - unconsciousness Q - vomiting R - weakness 90-204A.H&S 11 HAZARDOUS PROPERTY INFORMATION - FUEL~ Ftash Odor Threshotd . Accute Water' Specific Vapor Point Vaper~ LEL LD~ IDLH or Warning HazardJ Derma[K Exposure Nateriat Solubility Gravity Density °F Pressure UEL n~/kg TLV-TWA' Lever Concentration Property Toxicity Oieset Fuet insotubte 0.81-0.90 --- 130 --- 0.6-1.3 none NE 0.008 ppm BCO Cl BCEFHIKL 6.0~?.5 estabtished #NP Gasotine insoluble 0.72-0.76 3-4 -45 variabte 1.4X 300 ppm NE < 1 ppm BCDG Cl BCEFHIKL ?.6~ MNP Kerosene insoluble 0.83-1.0 --- 100-165 5 0.7~ none NE 0.008 ppm BCO C! 8CEFHIKL 5.0~ estabtished NNP HAZARDOUS PROPERTY INFORMATION - VOLATILE ORGANIC PRIORITY POLLUTANTR Flash Odor Threshotd AccuteL Water' Specific Vapor Point VaporE LEL ID~ iOLH or Warning HazardJ DermaL~ Exposure Material Solubility Gravity Density °F Pressure UEL mcj/k9 TLV-TWA' Level Concentration Property Toxicity S~tcx~ Acro[ein 22% 0.8~10 1.9 -15 214 mm 2.8~ 46 0.1 ppm 5 ppm 0.1-16.6 BCED BJ ABDFGHIK 31.0~ (0.21-0.5) LNNOI~R Acry[onitri[e 7.1~ 0.8060 1.8 30 83 rrm 3.0~ 82 2.0 ppm 4,000 ppm 19-100 BCEGD DIG FGIKLNNQ 17.0~ R Benzene 820 ppm 0.8765 2.8 12 75 mm 0.339X 3800 10.0 ppm 2,000 ppm 4.68 BCGD CIG BCDFHIKL 7.1~ 8romomethane 0.1 g 1.732 3.3 none 1.88 atm 13.5~ 5.0 Rom 2,000 ppm ' no odor CD BCDEIJKL 14.5~ M#OOR Bromodich[oromethane insoluble 1.980 -- none n/a non- 916 none none CGD BIMN f[am. established specified Bro~x~form 0.01 g 2.887 -- none 5 mm non- 1147 0.5 ppm . n/a 530 CED BCOKHN fram. Carbon Tetrachloride O.08X 1.5967 5.3 none 91 mm non- 2800 5.0ppm 300 ppm 21.4-200 CD JGH ABCFGHKN fram. O Ch[orobenzene 0.01 g 1.1058 3.9 84 8.8 mm 1.3~ 2910 75.0 ppm 2,400 ppm 0.21-60 BCD CIF BCFIKLM# 9.6~ OPQR Ch[oroethane 0.6 g 0.8978 2.2 -58 1.36 arm 3.8~ 1000.0 ppm 20,000 ppm BCO BFHIK]4NP 15.4~ 2-Chtoroethyivinyt insoluble 1.0475 3.7 80 30 mm -- 250 none none BCD HIM Ether established specified Chloroform 0.8 g 1.4832 6.12 none 160 mm non- 800 10.0 ppm 1,000 ppm 50-307 CD BCEGIKLN ftam. fatigue (>4096) N Ch[oro~ethane 0.74~ 0.9159 1.8 32 50 atm 7.6~ 50.0 ppm 10,000 ~ 10-100 BCO OHF ABCOEFGI 19.0~ no odor JKLOOR (500-1000) Dibr~T~ch[oro~ethane insoluble 2.451 ........ 848 none none BCD BFHIMNPO established specified HAZARDOUS PROPERTY INFORMATION - VOLATILE ORGANIC PRIORITY POLLUTANTS Nateriat Trichloroethy[ene (TCE) Trich[orof[uoro~ethane Water' Sotubiiity 0.1% 0.11 g Specific Gravity 1.4642 1.494 Ftash Odor Threshotd Vapor Point VaporE LEE LD~ %DLH or Warning Density °F Pressure UEL n~/kg TLV-TWA' Lever Concentration 4.5 90 58mm 12.5% 4920 50.0 ppm" 1,000 ppm 21.4-400 90.0% none 0.91 atm nqn- 1000.0 ppm 10,000 pp~ 135-209 (CONTINUED) Accute Hazard~ DermaL' Exposure Property Toxicity Symptom,: BC CD BFKLNC~Q BFHKLQ Toluene 0.05 g 0.866 3.2 fram. 40 22 mm 1.3% 5000 100.0 ppm 2,000 ppm 0.17-40 7.1% fatigue ~300-400) 260 8C BHE BEF#IKL# Vinyl Chtoride negtigibte 0.9100 2.24 -108 3.31 atm 3.6% 500 1.0 ppm none 33.0% specified NOPQ BCEG DJG ABFHIKLN R HAZARDOUS PROPERTY INFORMATION - HEAVY M~.TALR Flash WaterA Specific Vapor Point VaporE LEL LD~ IDLH Hateria[ SoLubility Gravity Density °F Pressure UEL mg/k9 TLV-TWAG Level Arsenic B 5.727 n/a none n/a F 10.0 ug/m' Odor ThreshoLd Accute' or Warning HazardJ Derma[' Exposure Concentration Property Toxicity Sympt~,, none CEG CJG ACOGJLMO specified QR BerylLium 8 1.85 n/a none n/a F 2.0 ug/mJ none specified Cadmium B 8.642 n/a none n/a F 225 0.5 mg/m' 40/mg' Chromium B 7.20 n/a none n/a F 0.5 mg/m~ 500/mcj~ F Copper B 8.92 n/a none n/a F 0.1 mg/m' Lead B 11.3437 n/a none n/a F 50.0 ug/m~ Mercury B 13.5939 7.0 none 0.0012 rrm F 50.0 ug/m~ C IJNNR C ABGIKLNN FNNG none C FGIJLMOQ specified R none C ACOFC. O~R specified 28 mg/m' C AGLHNQ Nickel B 8.9 n/a none n/a F 1.0 mg/W SiLver B 10.5 n/a none n/a F 0.01 mg/mJ ThaJLium 8 11.85 n/a none n/a F 0.1 mcj/mJ none C DGJLMNQ specified none specified 20 mg/m' C BG AOGLNOQ Zinc 8 7.14 n/a none n/a F none none C DF established specified HRZRRDOUS PROPERTY INFORmaTION - MISCELLANEOUS FLash Odor ThreshoLd Accute' WaterA Specific Vapor Point Vaporc LEL LD~ [OLH or Warning HazardJ DermaL" Exposure Material SoLubiLity Gravity Density °F Pressure UEL mil/kg TLV-TWAG Leve[ Concentration Property Toxicity S~,pLa,e Acetone soluble 0.8 2.0 -4 400 mm 2.5% 9750 750 ppm 10,000 ppm 100 BCO O! N 12.8% Asbestos insoluble 2.5 n/a none n/a non- 0.2-2 none CG flam. fibers/cc specified Chromic Acid soLubLe 1.67-2.82 n/a none n/a non- . none none fLam. established specified ACEG GIN Cyanides 58-72% n/a none n/a non- 5 mg/m' 50 mg/m3 CE f[am. FKLNPQ PCB (Generic) sLightLy -- n/a none n/a non- 1.0 ug/m" none CG CHLPQ soLubLe fLam. specified Pheno[ 8.4% 1.0576 3.2 175 0.36 mm 1.8% 414 5 ppm 100 ppm 0.047-5 (48) C ABCOGIKN 8.6% NO~ Xytene 0.00003% 0.8642 3.7 84 9.0 mm 1.1% 5000 100 ppm 10,000 ppm 0.5-200 (200) BCD ABFHIKLM 7.0% NPQ APPENDIX C ANALYTICAL RESULTS: AIR SAMPLES NATIONAL ENVIRONMENTAL TESTING, INC. NET Peciflc, Inc. 435 Tesconi Circle Santa Rosa, CA 95~- Tel: (707) 526-7200 Fax: (707) Mark Richards Aegis Environmental Inc. 1050 Melody Lane, Ste 160 Roseville, CA 95678 Date: 12/12/1991 NET Client Acct No= NET Pacific Log No: Received: 11/22/1991 Client Reference Information 3305.5 Gulf St., Bakersfield, Project: 90-204 65400 91.0841 Sample analysis in support of the project referenced above has been completed and results are presented on following pages. Please refer to the enclosed "Key to Abbreviations" for definition of terms. Should you have questions regarding procedures or results, please feel welcome to contact Client Services. Approved by: JS:rct Enclosure(s} NET Pacific, Inc Client Nos 65400 Dates Client Names Aegis Environmental Inc. N~T Log Nos 91.0841 Pages 12/12/1991 Ref= 3305.5 Gulf St., Bakersfield, Project= 90-204 Descriptor, Lab No. and Results Parameter EXH-STK-RW-1 BWR-EXH-RW-1 11-20-91 11-20-91 Reporting Method Limit 106013 106014 Units TPH (Gas/BTXE) ~THOD 5030 (GC,FID) DATE ANALYZED DILUTION FACTOR* as Gasoline METHOD 8020 DATE ANALYZED DILUTION FACTOR* Benzene Ethylbenzene Toluene Xylenes (Total) 12-05-9~ 12-05-91 i 1 2.5 24 1,800 ppmv 12-05-91 12-05-91 1 1 150 ND 5,400 ppbv 150 ND 7,000 ppbv 150 2,100 26,000 ppbv 150 ND 40,000 ppbv NET Pacific, Inc Client Noz 65400 Date~ Client Name~ Aegis Environmental Inc. NET Log No~ 91.0841 P&ge~ 12/12/1991 Ref: 3305.5 Gulf St., Bakersfield, Project= 90-204 Descriptor, Lab No. and Results Parameter EXH-STK-MW-1 BWR-EXH-MW-1 i 1 11-20-91 11-20-91 Reporting Method Limit 106015 106016 Units TPH (Gas/BTXE) ~.~THOD 5030 (GC,FID) DATE ANALYZED DILUTION FACTOR* as Gasoline. METHOD 8020 DATE ANALYZED DILUTION FACTOR* Benzene Ethylbenzene Toluene Xylenes (Total) 12-05-9i 12-05-91 i 1 2.5 9.9 2,300 12-05-91 12-05-91 I 1 150 ND 56,000 150 ND 21,000 150 2,800 130,000 150 ND 120,000 ppmv ppbv ppbv ppbv ppbv NET Pacific, Inc KEY TO ABBREVIATIONS and METHOD REFERENCES ICVS : mean : mg/Kg (ppm) : mg/L : mL/L/hr : MPN/100 mL : N/A : NA ND : NTU : RPD : SNA : ug/Kg (ppb) : ug/L : Less than; When appearing in results column indicates analyte not detected at the value following. This datum supercedes the listed Reporting Limit. Reporting Limits are a function of the dilution factor for any given sample. To obtain the actual reporting limits for this sample, multiply the sta:ed Reporting Limits by the dilution factor (but do not multiply reported values). Initial Calibration Verification Standard (External Standard). Average; sum 'of measurements divided by number of measurements. Concentration in units of milligrams of ana!yte per kilogram of sample, wet-weight basis (parts per million). Concentration in units of milligrams of analyte per liter of sample. Milliliters per liter per hour. Most probable number of bacteria per one hundred milliliters of sample. Not applicable. Not analyzed. Not detected; the analyte.concentration is less than applicable listed reporting limit. Nephelometric turbidity units. Relative percent difference, 100 [Value i - Value 2]/mean value. Standard not available. Concentration in units of micrograms of anal}~e per kilogram of sample, wet-weight basis (parts per billion). Concentration in units of micrograms of analyte per liter of sample. umhos/cm : Micromhos per centimeter. Method References Methods 100 through 493: see "Methods for Chemical Analysis of Water & Wastes", U.S. EPA, 600/4-79-020, rev. 1983. Methods 601 through 625: see "Guidelines Establishing Test Procedures for =he Analysis of Pollutants" U.S. EPA, 40 CFR, Part 136, rev. 1988. Methods 1000 through 9999: see "Test Methods for Evaluating Solid Waste", U.S. EPA SW-846, 3rd editi6n, 1986. SM: see "Standard Methods for the Examination of Water & Wastewater, · , 16th Edition, APHA, 1985. Phone (913) 782 2110 FAX (916) 786-7830 AEGIS Environmen,fal C/onsuitants, Inc. Sample Identification/Fiehl Chain of Custody Record Send results to: - ,. Aegis E'flvi~oqmen~al 1050 Melody lane, Suite 160 RoscvHle, CA 95678 <33os"? AEGISSilo Address: Project Shipped By:- Shipped To:_ Project Manager For Shell Projects Only WIC: CT/DL: Shell Engineer: ~./ Hazardous Materials Suslxx:~. Sampling Sample No. of Analysis Point Location Field IDg Date Type Container= Re~ uired Sampler(s) (signature) ~ Field ID nature) Date/Time Comments Sealed for shipm~:ni by: Dam/Time: //°,,~0 4/~,~._ ~';~)/a Shipment Melhod: _, ./,~/r~ ~____.~; e,~/~'CS Rcccivcd for Lab by: ' l)atc/Timc: ///&~/?/ 0 ~ Commcnls: Receiving Laboratory: Please return original form after signing for receipt of samples. ¸ii REMEDIAL SYSTEM MONITORING REPORT DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORNIA DELTA PROJECT NO. 40-87-326 O~ oo'TP Delta Environmental Consultants, Inc. Delta Environmental Consultants, Inc. 3330 Data Drive Rancho Cordova, CA 95670 916/638-2085 FAX:916/638-8385 June 22, 1989 E.,,i,~I~ON M ENTAL HEALTH Messrs. Thomas Paxson and Steve Powell Kern County Air Pollution Control District 2700 ,M" Street, Suite 275 Bakersfield, California 93301 Subject: Proposed Modification of Authority to Construct Air Permit 3305-U2 Gulf Street, Bakersfield, California 93308 Delta Project No. 40.87-326 Dear Messrs. Paxson and Powell: Delta Environmental Consultants, Inc. (Delta), on behalf of Davies Oil Company in Bakersfield received an Authority to Construct Air Permit (Application No. 0161001, dated September 12, 1988) to install a packed column air stripper to remove petroleum hydrocarbons from ground water at the referenced site. A copy of the permit is enclosed. The purpose of this letter is to propose modification in the compliance testing requirements for hydrocarbon emissions from the air stripper. An Authority to Construct--Modification application and the permit fee are enclosed. We propose to sample and analyze the influent water (upstream from the air stripper) for benzene and total hydrocarbons on a weekly basis for the first month after system start-up, and on a monthly basis thereafter. The sampling and related information will be submitted to the Air Pollution Control District on a monthly basis. Our target start date for the ground water recovery and treatment system will be Tuesday, June 27, 1989. Please call me or Michael Westerheim at (916) 638-2085 if you have any questions regarding this matter. Thank you for your assistance. Sincerely, DELTA ENVIRONMENTAL CONSULTANTS, INC. Sudhakar Talanki Project Engineer. SRT:mjd Enclosures cc/enc: Mr. Bill Davies, Davies Oil Company Ms. Amy Green, Kern County Environmental Health District Mr. Jong Hon, Central Valley Regional Water Quality Control Board Practical Solutions to Environmental Concerns KERN ~' N'FY AIR POLLUTION CONTROI~- ISTRICT 2700 "M" Street, Suite 275 Bakersfield, California 93301 Telephone: (805) 861-3682 APPLICATION FOR: [] Authority to Construct (ATC) [] ATC- Modification [] ATC-- Renewal AN 1. [] Permit to Operate (PTO) [] Banking Certificate [] PTO - Modification [] Transfer of Location [] PTO - Transfer of Ownership APPLICATION IS REQUIRED FOR EACH SOURCE OPERATION AS DEFINED IN RULE 102, SECTION cc. PERMIT TO BE ISSUED TO: Name of organization to operate the following equipment: Davies Oil Company MAILING ADDRESS: P.O. Box 80067, Bakersfield, California Zip Code: 93380 LOCATION AT WHICH THE EQUIPMENT IS TO BE OPERATED: 3305½ Gulf Street~ Bakersfiel.d, Californiq 93308 GENERAL NATURE OF BUSINESS: Office, Petroleum Storage, and Fueling Facility EQUIPMENT FOR WHICH APPLICATION IS MADE: Packed Column Air Stripper Model A S4-185T manufactured by Delta Cooling Towers, New Oersey Packing Type-SH Blower-7.5 HP (230 V, 3 phas6) Provide additional information as required by District "Instructions". o TYPE AND ESTIMATED COST OF AIR POLLUTION CONTROL EQUIPMENT: None 7. TYPE AND ESTIMATED COST OF BASIC PROCESS EQUIPMENT: o Air Stripper $25,000. Ground water recovery and treatment (numns. tanks, cnrhnn_ SIGNATURE OF APPLICANT: TYPE OR PRINT NAME OF SIGNER: Bill Davies sontrols) system $40.000. TITLE OF SlGNE~: Owner DATE: PHONE NO.: Ifln~ ~'~-~n~ DATE RECEIVED Validation (For APCD Use Only) FILING FEE: $ RECEIPT NO.: DATE: A,r Oulh~y 580 9149 011 mev 3/cai KERN COUNTY AIR POLLUTION CONTROL DISTRICT A UTttORITY TO 2700 "N" Street, Suite 27.5 Bakersfield, California g~,301 Telephone: (805) 861-3682 CONSTRUCT ISSUE DATE: EXPIRATION DATE: January 12. ~989 January 12, 1991 APPLICATION NO. 0~61001 DATE: September 13, 1988 AUTHORITY TO CONSTRUCT IS HEREBY GRANTED TO: DAVIES OIL COMPANY In the event an AUTHC~IT'Y' TO CONSTRUCT is reissued to a new owner, any emissions increase assigned to this equipment during the initial New Source Review Process remains with the initial bearer of this doct~nent. AUTHORITY TO CONSTRUCT IS HEREBY GRANTED FOR: Contaminated Groundwater Extraction and Treatment System (See attached sheets for eauioment description and conditions) S 11 T 29S 27E Loc:!ian: 3305 1/2 Gulf St. ,Bakersfield Start-up Inspection Date: Upon completion of construction and/or installation, please telephone the Manager of Engineering Evil- uation. This doc~nent serves as a TD,~CRARY Permit to Operate only as provided by Rule 201 of the District's Rules and Regulations. For the issuance of o Permit to Operate. Rule 208 requires that the equipment authorized by this AUTHORITY TO CONSTRUCT be installed and operated in accordance with the conditions of approval. Changes to theoe conditions must be made by application and must be approved before such changes are made. This aact~n~nt does not authorize the emission of air contcminonts in excess of New Source Review limits (Rule 2~0.1) or Regulation IV emission limits. Emission testing requirements set forth in this aocument must be satisfied before a Permit to Operate con be granted. Apm ~'~ (D~.) 3/88 Manager of Englneering Evaluation PaEe 2 o£ 4 Pages 0161001 Continued EQUIPMENT DESCRIPTION: Contaminated Groundwater Extraction and Treatment pystem, including the following equipment and design specifications: a · B. C. D. E. Maximum of two extraction wells with submersible hydrocarbon and water extraction pumps, 250 gallon recovered gasoline storage tank, Delta Cooling Tower S4-185-T air stripping column, 48 tn. dia. x 25 ft. tall, 5 hp blower with 8000 cfm capacity, Four 1200 ibm liquid phase carbon absorption canisters. CONDITIONAL APPROVAL: Pursuant to Rule 209, "conditional approval' is hereby granted. Please be aware that all conditions o[ approval remain In effect for life of project, unless modifications are approved by District. DESIGN CONDITION: Inlet to air stripping column shall be equipped with f]owrate indicator. (Rule 209) OPERATIONAL CONDITIONS: Groundwater flow£ate to air stripping column shall not exceed 144,000 gal/day. (Rule 210.1) Benzene flowrate to stripping column shall not exceed 0.30 gal/day. (Rules 210.1 & 419) Total hydrocarbon flowrate to stripping tower shall not exceed 12.36 gal/day. (Rule 210.1) Stripping tower shall not operate longer than 3 years without an addi- tional risk assessment. (Rule 209) EMISSION SAMPLING LIMIT: (Entire Stationary Source) Hydrocarbons: 3.16 ibm/hr (Total HC) (Rule 210.1) 0.09 ibm/hr (as Benzene) (Rule 419) COMPLIANCE TESTING REQUIREMENTS: Compliance with emission sampling limit and operational conditions b & c shall shall be demonstrated by daily sample collection and analysis. Influent samples shall be collected at a point upstream from the air stripping column and analyzed for benzene and total hydrocarbons. Daily record of influent hydrocarbon and benzene content, influent flowrate (gal/day) shall be maintained and submitted to the District monthly. (Rule 108.1) · Page 3 of 4 Pages 0161001 Continued STATE OF CALIFORNIA AIR TOXICS HOT SPOTS REQUIREMENTS: Facility shall comply with California Health and Safety Code Sections 44300 through 44384. (Rule 208.1) RULE 210.1 (NSR), ANALYSIS VALIDATION: Maximum daily emission rate of hydrocarbons from this stationary source shall not exceed dally amount shown as "proposed" on attached emission profiles. Maximum average.,.monthly emission rate of hydrocarbons from this stationary source shall not exceed number of days in month times daily amount shown as "proposed" on attached emission profiles. Average monthly emission rate shall be determined at end of each month by averaging previous 12.months of operation (fewer than 12 if new or seasonal source). Compliance with these emission limits shall be verified by source operator (with fuel consumption data, operational data, etc.) on daily basis (maximum daily emission rate) and on monthly basis (maximum average monthly emission rate) and written documentation made readily available to District for period of one year. RULE 210.1 (NSR) SPECIFIC LIMITING CONDITIONS: (See attached emission profiles). ~ E~ission Profiles: Hydrocarbons Lbm/Day vs. Days/Yezr Lbm/Day Proposed Prc£i!e = REMEDIAL SYSTEM MONITORING REPORT DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORNIA DELTA PROJECT NO. 40-87-326 prepared by: Delta Environmental Consultants, Inc. 3330 Data Drive Rancho Cordova, California 95670 August 18, 1989 1.0 2.0 3.0 4.0 5.0 6.0 TABLE OF CONTENT~ INTRODUCTION SYSTEM MONITORING 2.1 Sampling and Data Collection 2.2 Hydrocarbon Emissions from Packed Column Air Stripper 2.3 Estimation of Breakthrough for Activated Carbon Filters PROPOSED MONITORING PROGRAM GRADIENT CONTROL 4.1 Theoretical Capture Zone for Recovery Well RW-1 4.2 Effect of Using Infiltration Trench for Water Discharge DISCUSSION OF RESULTS 5.1 Treatment System Efficiency 5.2 Hydrocarbon Plume Capture PROPOSED ADDITIONAL WORK 6.1 Additional Monitoring Wells 6.2 Vapor Extraction System (VES) 7.0 REMARKS/SIGNATURE 2 2 2 4 4 TABLE 1 TABLE 2 TABLE 3 Tables Water Chemistry Results TPH and Benzene Emission Rates Proposed Sampling Schedule of Water Treatment System (1 year) FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4 APPENDIX A APPENDIX B APPENDIX C APPENDIX D APPENDIX E APPENDIX F Fieures Site Location Map Site Map Theoretical Capture Zone for Recovery Well RW-I Simulation to Determine Effect of Infiltration Discharge Aooendices Laboratory Reports System Start-up Data Calculation Methodology for Hydrocarbon Emission Rates Calculation Methodology for Estimation of Carbon Breakthrough Theoretical Capture Zone for Recovery Well RW-I Simulation Results of Pumping Recovery Well and Infiltration Discharge REMEDIAL SYSTEM MONITORING REPORT DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORNIA DELTA PRoJEcT NO. 40-87-326 1.0 INTRODUCTION Delta Environmental Consultants, Inc. (Delta), is submitting this report on behalf of Davies Oil Company, Bakersfield, California, in accordance with the Monitoring and Reporting Program (MRP) No. 89-025 dated March 13, 1989, issued by the California Regional Water Quality Control Board, Central Valley Region (Regional Board), Fresno, California. The MRP was issued as part of the waste discharge requirements for Davies Oil Company, Ground Water Cleanup Project. Delta has been authorized by the client to assist in investigation and remediation of the site due to a gasoline leak of approximately 2,500 gallons in the fall of 1985. Figure I presents the Site Location Map. The layout of the ground water recovery and treatment system on the site is shown in Figure 2. In a meeting with Mr. John Noonan and Mr. Jong Han of the Regional Board on June 8, 1989, it was decided to sample and analyze the influent and effluent ground water weekly for one month to collect sufficient data, and to evaluate the efficiency and characteristics of the ground water treatment system. Based on the results of the first months operation, Delta would recommend an appropriate monitoring'program. The ground water recovery and treatment system commenced operation on June 29, 1989, after final adjustments on June 27 and 28, 1989. The water treatment system is designed to pump ground water from recovery well RW-I into a packed column air stripper to remove dissolved petroleum hydrocarbons. The effluent from the air stripper is pumped through a particulate filter to remove particulate matter and through two activated carbon filters in series to remove any remaining hydrocarbons before discharge to the infiltration gallery on site. Automatic level controls are incorporated for operation of the system. The details of the system are included in Delta's Proposal for Additional Site Assessment and Remedial Action Report, dated November 9, 1988. The as-built diagrams will be included in the semiannual monitoring report that will be submitted prior to January 1, 1990. 2.0 SYSTEM MONITORING 2.1 Sam~linR and Datla Collection For the first month after system start-up, water samples were collected weeklY on June 29, July 6, 13, and 20, 1989, and sent to the laboratory for dissolved hydrocarbons, carbon tetrachloride, and total lead analysis. The air stripper influent (AI) was collected at RW-1 well head; air stripper effluent (AE) before the first activated carbon filter; and infiltration discharge (ID) after the second activated carbon filter. The analytical results are included in Table 1. Ethylene dichloride, ethylene dibromide, and carbon tetrachloride were not detected in any of the water samples analyzed. Copies of the laboratory results are included in Appendix A. The details of the system start-up are included in Appendix B. 2.2 Hydrocarbon Emissions from Packed Column Air Stripper The total petroleum hydrocarbons (TPH) and benzene emissions from the air stripper on June 29, July 6, 13, and 20, 1989, are calculated using the results of the laboratory analyses and water flow rate through the air stripper. Table 2 shows the emission rates. The calculation methodology is shown in Appendix C. For the air permit application health risk assessment, a computer air dispersion model (PTPLU version 2.0), developed by the California Air Resources Board, was utilized with an'assumed water flow of 100 gallons per minute (gpm) and a TPH concentration of 50 parts per million (ppm). Under these conditions, the calculated excess lifetime cancer risk due to air emissions was much less than one in a million: Actual operation parameters are well below the design assumptions. o.o."' Z $ '"' Z .o. ZZZo. %' %' V V¥¥ ¥¥¥ ZZZZZZ ZZZZ ZZZZ ZZZZZZ ZZZ:Z Z:ZZZ ZZZZZ ZZZZ ZZZZ ~~ ZZZZ ZZZZ ~1 ~q~ zzzz zzzz ;I ~~ ZZZZ ZZZZ ~qqq~ ZZZZ ZZZZ 000000 0000 ...... mmmm REMEDIAL SYSTEM MONITORING REPORT Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA Delta Project No. 40-87-326 Page 4 TABLE 2 TPH and Benzene Emission Rates (First Month of Operation of Water Treatment System) TPH Benzene Date {lbs/day) (lbs/day) 06-29-89 0.6 0.01 07-06-89 1.2 0.01 07-13-89 1.0 0.02 07-20-89 1.0 0.02 2.3 Estimation of Breakthrough for Activated Carbon Filters The activated carbon filtration system consists of two 1,200-pound activated carbon filters in series. The activated carbon filters serve to polish the effluent from the air stripper prior to the infiltration gallery discharge to assure that no hydrocarbons can re-enter the aquifer. The first month's sampling data have shown that the air stripper is I00 percent efficient and removes all dissolved hydrocarbons prior to carbon filtration. Therefore, the theoretical carbon life is unlimited. The following monitoring procedures will be used to document air stripper performance; weekly check of airflow rate, packing condition, and water flow rate. Influent concentrations will be monitored monthly, and effluent concentrations will be monitored quarterly. The calculation methodology for determining carbon breakthrough is included in Appendix D. Since the influent hydrocarbon concentrations to the carbon filters are nondetectable, a worst case assumption was necessary for calculation purposes. The worst case for the influent, dissolved hydrocarbon loading in water is assumed at 0.1 ppm xylene (xylene is assumed as the' major component in TPH for calculation purpose). The effluent concentration is assumed at 0.05 ppm. The reason for using xylene concentrations is that, while carbon isotherms have been developed for individual constituents such as BTEX, there is no isotherm developed for TPH as a group. The estimated breakthrough time is on the order of 3 years. Quarterly monitoring of the effluent from the carbon filter should provide adequate data for determining the breakthrough curve as required in the MRP. REMEDIAL SYSTEM MONITORING REPORT Davies Oil Company 3305 1/2 Gulf Street Bakerafield, CA Delta Project No. 40-87-326 Page $ 3.0 PROPOSED MONITORING PROGRAM After the first month of operation of the water treatment system, the following will constitute the monitoring program from August 1989 to August 1990. · Sampling and analyzing the air stripper influent on a monthly basis for dissolved hydrocarbons to calculate air emissions as required by the APCD. · Sampling the air stripper effluent on a quarterly basis for dissolved hydrocarbons, as required by MRP to document air stripper efficiency. Sampling the discharge to the infiltration gallery on a quarterly basis for dissolved hydrocarbons as required by MRP to document discharge water quality. The discharge sample will be collected after the first of the two activated carbon filters in series to monitor for carbon breakthrough. The reason for sampling after the first carbon filter is the assumption that the first carbon filter will achieve breakthrough prior to the second carbon filter. The breakthrough for the first filter is estimated on the order of 3 years. If the periodic inspection of air stripper packing, monthly sampling of air stripper influent for concentration fluctuations, and quarterly sampling after the first carbon filter indicate that carbon breakthrough has been achieved, the second carbon filter will act as a backup before water discharge to the infiltration gallery. After breakthrough is achieved in the first carbon filter, the spent carbon will be replaced by regenerated or fresh carbon. · Collecting pumping information from recovery well RW-I. · Collecting information on free product recovery from RW-I. Collecting water and product levels (if any) in the monitoring wells MW-2, MW-3, MW-4, MW-5, MW-8, MW-9, MW-10, MW-II, MW-12, and piezometers P-I and P-2 in the infiltration gallery for ground water flow and presentation of capture zone calculations for recovery well RW-I. Calculating hydrocarbon removal rates from water through the air stripper and carbon. The information will be used to quantify air emission rates and to estimate breakthrough point for carbon, respectively. · Reporting the information and progress to the Regional Board on a monthly basis. REMEDIAL SYSTEM MONITORING REPORT Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA Delta Project No. 40-87-326 Pase 6 In addition, the semiannual sampling of all monitoring wells will be performed as required in the MRP, and reporting will be in accordance with the MRP. Table 3 shows the proposed sampling schedule for one year of operation of the water treatment system (till October 1990). The monitoring program will be evaluated and revised if necessary after the first year. TABLE3 Proposed Sampling Schedule of Water Treatment System (1 year) Sampling Point/ Description Sampling Frequency Sampling Period Analysis Air Stripper Influent Monthly August 1989 to August 1990 BTEX, EDB, EDC, and TPH (Fuel Fingerprint) Air Stripper Influent Quarterly August 1989 to August 1990 Total Lead Air Stripper Effluent Quarterly August 1989 to August 1990 Fuel Fingerprint and Total Lead Infiltration Discharge after First Activated Carbon Filter August 1989 to Quarterly August 1990 Fuel Fingerprint and Total Lead Monitoring Wells Biannual September 1989 and April 1990 Fuel Fingerprint 4.0 GRADIENT CONTROL 4.1 Theoretical Capture Zone for Recovery Well RW-1 Recovery well RW-I has been pumping at 30 gpm since the system start-up on June 29, 1989. Figure 3 shows the theoretical zone of capture for the well. The theoretical downgradient stagnation point extends 195 feet from RW-I. The width of capture at the well is 307 feet. The assumptions and calculation methodology are included in Appendix E. ,4.2 Effect of Using Infiltration Trench for Water Discharge REMEDIAL SYSTEM MONITORING REPORT Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA Delta Project No. 40-87-326 Pa~e 7 4,2 Effect of Using Infiltration Trench for Wa~¢r Discharge The viability of using an infiltration trench to dispose of treated ground water to the aquifer was checked using a computer program that simulated both the withdrawal of ground water from the recovery wells and infiltration to the trench. The program solves the ground water flow problem using a variation of the Theis equation. Ten infiltration wells in a north-south line, spaced 10 feet apart, were used to simulate a 100-foot- long infiltration trench. For the model simulation, the wells were located in the infiltration trench at locations indicated on Figure 4. It was assumed that a total of 100 gpm were being pumped, treated,, and then reinfiltrated. The infiltration rate for each well was thus 10 gpm. The results shown in Appendix F indicated that 'mounding" of water at the infiltration trench would be minimal due to the highly transmissive nature of soils beneath the trench. The effect of the mound would not act to 'short circuit" recharge to the well, because the extent of the mound is limited to the area immediately adjacent to the infiltration trench. The mound dissipated to back ground water levels within a distance of 40 feet of the trench (recovery well RW-1 is located more than 300 feet from the trench). At present, the system is running at 30 gpm from one recovery well and the mounding effect is much less. Thus, the infiltration gallery will not exacerbate the hydrocarbon plume migration. $.0 DISCUSSION OF RESULTS $.1 Treatment System Efficiency Laboratory analyses of water samples collected on June 29, July 6, 13, and 20, 1989, indicate that the discharge limits are being met for the ground water cleanup operations at the site. The packed column air stripper has removed 100 percent of the influent BTEX and TPH concentrations. The treatment system has adequate capacity for one additional recovery well of 50 gpm capacity. 5.2 Hydrocarbon Plume Capture Data collected over the past 3 years have given a good indication of the on-site hydrocarbon plumes and their direction of migration. This data has been used to estimate the downgradient shape and extent of the hydrocarbon plumes. These plumes are shown in Figure 3 along with the estimated theoretical capture zone and proposed additional monitoring wells. The actual shape and extent of the hydrocarbon plumes has not been defined by actual monitoring well installation, and is only REMEDIAL SYSTEM MONITORING REPORT Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA Delta Project No. 40-87-326 Page 8 estimated. However, based on the data collected to date, it does not appear that RW-1 will be adequate to control the plume of hydrocarbons. An additional recovery well may be necessary; however, this can only be evaluated after the installation of proposed monitoring wells MW-13, MW-14, and MW-IS. Monitoring well MW-16 is proposed to evaluate the effect of the infiltration gallery. Adjacent property owners Mr. Cyril Andre and Mr. Jim Boylan were contacted by the Regional Board in July 1989, and requested to allow access to investigate the extent of hydrocarbons plume migration and possible allow remedial action. Right-of-entry documentation is currently being prepared. The additional monitoring well installation will occur after right-of-entry is obtained. 6.0 PROPOSED ADDITIONAL WORK ~,1 Addi0onal Monitoring Wells Delta will continue efforts to obtain access to install additional monitoring wells in the adjacent properties to investigate the extent of hydrocarbon plume migration and possible remedial action. The additional monitoring Well installation Will occur after right-of-entry is obtained. 6.2 Vapor Extraction System (VES) VES is being considered as an additional remedial measure to accelerate site cleanup. Provisions are built into the current system for manifold installation and power requirements. However, the actual soil vent system design depends upon the plume configuration, and will be evaluated after the additional monitoring wells are installed. REMEDIAL SYSTEM MONITORING REPORT Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA Delta Project No. 40-87-326 Page 9 7.0 REMARKS/SIGNATURE The recommendations contained in this report represent our professional opinions, and are based in part on information supplied by the client. These opinions are based on currently available information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended. DELTA ENVIRONMENTAL CONSULTANTS, INC. This report was Prepared by: Sudhakar Talanki Project Engineer Date This report was reviewed by: /~~ ~7. ~. Michael M. Westerheim Civil Engineer/ Project Manager The work performed in this report was done under the supervision of a California Registered Geologist: Brian L. I~'3~)gseng' ~'~ California Registered Geologist #2303 Irc Date Date GARY J. WICKS Agency Director (805) 561-3502 STEVE McCALLEY Director 2700 M Street, Suite 300 Bakerafleld, CA 93301 Telephone (805) 861.3636 Telecopler (805) 851-3429 AGENCY August 17, 1989 Mr. Sudar Talanki Delta Environmental Consultants, Inc. 3330 Data Drive Rancho Co~dova, CA 95670 SUBJECT: Location: Known as: Permit #: 3305 1/2 Gulf Street, Bakersfield Davies 0il Company 050072 Dear Mr. Talanki: Per your request, this letter is to inform you that effective. July 12, 1989, the subject case was reassigned to me. All reports: submitted to this Department can be addressed to my attention. If you have any questions regarding this matter, please call me at (805) 861 -3636. Sincerely, Dolores Gough Hazardous Materials Specialist Hazardous Materials Management Program DG:jg CC: Mr. Bill Davies, Davies Oil Co. Mr. Jong Hon, CVRWQCB Delta Environmental Consultants, Inc. 3330 Data Drive Rancho Cordova, CA 95670 916/638-2085 FAX:916/638-8385 May 26, 1989 Mr. Bill Davies Davies Oil Company P.O. Box 80067 Bakersfield, California 93380 Subject: Semiannual Ground Water Monitoring and Proposed Additional Work Report Davies Oil Company Site 3305-1/2 Gulf Street Bakersfield, California Delta Project No. 40-88-326 Dear Mr. Davies: Enclosed is a copy of the Semiannual Ground Water Monitoring and Proposed Additional Report for the referenced site. Additional copies of this report are being forwarded as noted below. This report fulfills the requirements for semiannual reporting as described in the Waste Discharge Permit No. 89-025. Also, included as part of the permit requirements is a section on proposed additional work. This proposed additional work is intended to evaluate soil contamination which may be contributing to dissolved hydrocarbon levels found in MW-2 and MW-3 at the site. As part of this evaluation, we propose to utilize the soil sample results obtained during the replacement of the underground storage tanks. Please notify us as soon as you know the schedule for tank removal. It has been a pleasure serving you on this project. If you have any questions regarding this report or need additional information, please call me at (916) 638- 2085. Sincerely, DELTA ENVIRONMENTAL CONSULTANTS, INC. 'Michael M. Westerheim Project Engineer MMW:rc Enclosure cc/enc: Mr. Jong Hon, California Regional Water Quality Control Board Central Valley Region Ms. Amy Green, Kern County Health Department Mr. Thomas Paxson, Kern County Air Pollution Control District Practical Solutions to Environmental Concerns SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORNIA DELTA PROJECT NO. 40-87-326 Prepared by Delta Environmental Consultants, Inc. 11030 White Rock Road, Suite 110 Rancho Cordova, California 95670 (916) 638-2085 May 25, 1989 TABLE OF CONTENTS 1.0 INTRODUCTION 2.0 BACKGROUND INFORMATION 2.1 Site Location and Description 2.2 Previous Work Conducted at the Site 3.0 PROJECT RESULTS 3.1 Ground Water Elevations and Observations 3.2 Ground Water Chemical Results 4.0 DISCUSSION OF RESULTS 4.1 Ground Water Elevations and Flow 4.2 Ground Water Chemistry 5.0 PROPOSED ADDITIONAL WORK 6.0 REMARKS/SIGNATURES 7 Tables TABLE 1 TABLE 2 Ground Water Elevation Data and Physical Observations Ground Water Chemistry Results 4 6 FiRures FIGURE FIGURE FIGURE FIGURE FIGURE APPENDIX A Site Location Map Site Map Site Vicinity Map Water Table Contour Map Inferred Hydrocarbon Plume Migration Appendices Analytical Laboratory Results SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK DAVIES OIL COMPANY 3305-1/2 GULF STREET BAKERSFIELD, CALIFORNIA DELTA PROJECT NO. 40-87-326 1.0 INTRODUCTION Delta Environmental Consultants, Inc. (Delta), has prepared this Semiannual Monitoring Report for Davies Oil Company in Bakersfield, Kern County, California (Figure l, Site Location Map). Delta has been authorized by the client to assist in a gasoline leak investigation and remediation activities. Monitoring and Reporting Program (MRP) No. 89-025 was issued by the California Regional Water Quality Control Board, Central Valley Region (Regional Board), on March 13, 1989. This report describes'site monitoring and activities conducted prior to issuance of the MRP. Site monitoring conducted after installation of the ground water treatment system will be described in subsequent reports. Since Delta's last report (November 9, 1988), three site visits were made to accomplish the following: 1. A more detailed site map and site vicinity map were produced. 2. Water levels in each monitoring well and product thickness, if any, were measured in November 1988, and January and March 1989. Ground water samples were collected and submitted for chemical analyses (fuel fingerprint) for benzene, toluene, ethylbenzene, and xylenes (BTEX), ethylene dibromide (EDB), 1,2- dichloroethane (EDC), and total petroleum hydrocarbons (TPH). 4. An Authority to Construct air permit was obtained to install an air stripper for the proposed ground water treatment system from Kern County Air Pollution Control District (APCD). 5. An infiltration gallery with a water discharge line, and concrete pads.for installation of th~ proposed ground water treatment system were completed. SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK Davies Oil Company 3305-i/2 Gulf Street Bakersfield, California Delta Project No. 40-87-326 Page 9. The recovery well (RW- 1) pump test water stored on site was sampled for BTEX and TPH. The laboratory analysis showed it was clean. The clean water was drained from the baker tank. 7. Efforts to secure access for drilling off site monitoring/recovery wells were continued. 8. This report was prepared, summarizing the results of our work. 2.0 BACKGROUND INFORMATION 2.1 Site Location and Description The site is currently occupied by an operating gas station and related office buildings at 3305-1/2 Gulf Street, Bakersfield, California (Figure 2). The site vicinity map is included in Figure 3. 2.2 Previous Work Conducted at the Site Petroleum product losses were detected and identified in the soil and ground water at the site. The hydrogeological assessment and remedial action plans to clean up soil and ground water, and all work conducted at the site from July 1986 to May 1988, is discussed in the following reports: Report Proposed Hydrogeologic In vestigation Proposed Hydrogeologic '.s.'tudy Subsurface Contamination Assessment Quartet~ly Monitoring Results and Proposed Additional Work Quarterly Monitoring Report Proposal for Additional Site Assessment and Remedial Action D.a. te Author February 25, 1987 Twin City Testing (TCT) April 22, 1987 TCT July 9, 1987 TCT January 10, 1988 Delta June 10, 1988 Delta November 9, 1988 Delta SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK Davies Oil Company 3305-1/2 Gulf Street Bakersfield, California Delta Project No. 40-87-326 P,,ge 3 3.0 PROJECT RESULTS 3.1 Ground Water Elevations and Observali0n~ Depth to ground water was measured and physical observation and free product thicknesses were recorded at monitoring wells MW-2 through MW-5, MW-8 through MW-12, and recovery well RW-1 during the three site visits on November 2, 1988, January 13, and March 13, 1989, respectively. The results are presented in Table 1. Measurements dating to July 1986 are included for comparison. Figure 4 is a ground water contour map generated from water level data collected on March 13, 1989. The inferred direction of ground water flow is from northeast to southwest. The gradient calculated from Figure 4 is 0.003 feet/foot. 3.2 Ground Water Chemical Results Monitoring wells MW-2 through MW-4 and MW-8 through MW-10 were sampled on March 13 or 14, 1989. MW-I, MW-11, and RW-1 were not sampled because of presence of free product in the wells. The samples were submitted to the laboratory for fuel fingerprint analyses by U.S. Environmental Protection Agency (EPA) Method 524.2/8260. The results are summarized in Table 2, and copies of certified laboratory reports are included in Appendix A. Table 2 also contains the chemical results from May and October 1987, and May 1988 for comparison. Figure 5 is a map showing the inferred migration of the hydrocarbon plume based on ground water flow measurements, physical observations, and chemical results. 4.0 DISCUSSION OF RESULTS 4.1 Ground Water Elevations and Flow Water level measurements in the monitoring wells indicate that the water table has fluctuated with time. Water levels dropped more than 2.5 feet between May and November 1988. Water levels have risen more than 2.5-feet between November 1988 and March 1989. These water table movements are normal seasonal fluctuations. The inferred direction of ground water flow is from northeast to southwest. There is a slight shift to the south in ground water flow in March 1989 compared with ground water flow in May 1988. 4.2 Ground Water Chemistry Based on physical observations and laboratory results, there appears to be two dissolved hydrocarbon plumes under the site (1) dissolved gasoline and (2) dissolved diesel. The physical observations indicated obvious differences between wells MW-2, MW-3, and MW-9 versus MW-11 and MW-12. The anticipated plume migration shifted slightly further to the southwest to match ground water flow under the site. The dissolved hydrocarbon concentration is not increasing in MW-9 and it would be if the plume was migrating in that direction. SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK D,,vies Oil Comp,my 3305-1/p- Gulf Street Baker.field, C~liforni~, Delt~ Project No. 40-87-$26 PKge 4 TABLE 1 Ground Water Elevation Data and Physical Observations Monitoring Well MW- 1 MW-2 MW-3 MW-4 Depth to Ground Reference Ground Water Date Water Elevation, El¢v~ti0n 07/11/86 14.86 409.33 394.47 05/08/87 18.23 391.10 10/22/87 19.72 389.61 12/03/87 20.66 388.67 03/04/88 19.09 390.24 05/02/88 21.24 388.09 11/02/88 22.83 386.50 01/13/89 19.93 389.38 03/13/89 20.22 389.11 07/11/86 15.02 409.31 394.29 05/08/87 17.87 391.44 10/22/87 19.35 389.96 12/03/87 20.43 388.88 03/04/88 19.07 390.24 05/02/88 20.70 388.61 11/02/88 22.79 382.56 01/13/89 20.04 389.27 03/13/89 20.45 388.86 07/11/86 15.37 410.22 394.85 05/08/87 18.34 391.88 10/22/87 20.00 390.22 12/03/87 20.77 389.45 03/04/88 19.42 390.80 05/02/88 21.10 389.12 11/02/88 22.86 387.36 01/13/89 20.20 390.02 03/13/89 20.77 389.45 07/11/86 15.06 409.72 394.66 05/08/87. 17.87 391.85 10/22/87 18.46 391.26 12/03/87 20.41 389.31 03/04/88 19.03 390.69 05/02/88 20.58 389.14 11/02/88 22.50 389.22 01/13/89 20.08 389.64 03/13/89 20.30 389.42 Physical Characteristics/ Comments Approx. 4" free product. Approx. 0.5' free product. Approx. 0.06' free product. Approx. 0.8' free product. Approx. 0.25' free product. Approx. 0.2' free product.. Rainbows visible, strong odor. Rainbows visible, no product. No product. Noticeable odor. No odor. Slight odor. Rainbow visible, slight diesel odor. Rainbows visible no product. No product. Noticeable odor. Slight odor. Slight diesel odor. Slight' odor. Slight diesel odor. Brown; silty. No odor. No odor, casing wet. No odor. *Adjusted elevation for assumed error. Note: All elevations referenced to the benchmark located near fence corner at northeast end of Gulf Street. The benchmark is a white wood post, elevation 409.50 feet above mean sea level. The well elevations were surveyed by Delta on May 2, 1988. SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK D aviea -Oil Company 3305-1/2 Gulf Street Bakersfield, California Delta Projecl; No. 40-87-326 Page $ TABLE 1 (Continued) Ground Water Elevation Data and Physical Observations Monitoring Well MW-5 MW-8 MW-9 MW-10 MW-II MW-12 RW-I Depth to Ground Reference Ground-Water Date Water Elevation Elevation 03/13/89 18.32 407.62 389.30 05/08/87 18.00 409.68 391.68 10/22/87 19.60* 390.08* 12/03/87 20.60 389.88 03/04/88 19.27 390.41 05/02/88 .... 11/02/88 dry -- 01/13/89 dry -- 03/13/89 20.70 388.98 05/08/87 15.37 406.60 391.23 10/22/87 17.38 389.22 12/03/87 18.12 388.48 03/04/88 16.70 389.90 05/02/88 18.26 388.34 11/02/88 dry -- 01/13/89 17.87 388.73 03/13/89 18.20 388.40 03/03/88 17.52 408.12 390.60 05/02/88 19.08 389.04 11/02/88 21.00 387.12 01/13/89 18.36 389.76 03/13/89 18.82 389.30 03/04/88 19.23 409.43 390.20 05/02/88 20.78 388.65 11/02/88 23.57 385.56 01/13/89 20.62 388.81 03/13/89 20.63 388.80 03/04/88 18.62 408.67 390.05 05/02/88 20.16 388.51 11/02/88 22.86 385.81 01/13/89 19.81 388.86 03/13/89 20.02 388.65 11/02/88 23.91 410.09 386.18 01/13/89 20.82 389.27 03/13/89 21.15 388.94 Physical Characteristics/ Comments Brown; silty. No odor.' No odor, casing wet. Not measured. Rainbows visible, no product. No product. Slight odor. No odor. Slight odor. No odor. No odor. Strong odor. No Product. Approx. 0.75' free product. Approx. 0.5' free product. Approx. 0.3' free product. Strong odor. Slight odor. Approx. 0.5' free product. Approx. 0.2' free product. Approx. 0.1' free product. Approx. 0.25' free product. Approx. 0.2' free product. Approx. 0.01' free product. *Adjusted elevation for assumed error. Note: All elevations referenced to the benchmark located near fence corner at northeast end of Gulf Street. The benchmark is a white wood post, elevation 409.50 feet above mean sea level. The well elevations were surveyed by Delta on May 2, 1988. TABLE 2 Ground Water Chemistry Results (Concentrations in ppm) Monitoring Date Elhyl- Well Sampled Benzene Tglu~ne benzenq MW-2 05/08/87a 0.089 ND ND 10/22/87 0.005 0.022 ND 03/05/88 0.013 0.002 0.005 03/13/89 0.005 0.02 ND MW-3 05/08/87a 0.0009 ND ND 10/22/87 'ND 0.003 0.001 MW-4 03/05/88 ND ND ND 03/13/89 ND ND ND 05/08/87a 0.0018 0.0076 ND 10/22/87 0.0001 ND ND 03/05/88 ND ND ND 03/13/89 ND ND. ND 05/08/87a ND ND ND 10/22/87 ND ND ND 03/04/88 ND ND ND 03/13/89 .ND ND ND 05/08/87a i.155 3.81 !.74 10/22/87 0.01 1.6 2.2 03/04/88 0.04 !.1 3.6 03/13/89 0.031 0.12 2.2 03/13/8~dup) 0.033 0.13 2.3 MW-8 MW-9 MW-10 03/04/88 0.0022 ND ND 03/13/89 ND ND ND MW-~I. 03/04/88 ~0 89 3.2 03/13/89 ...... MW-12 ~ylen~ 0.089 0.012 0.039 0.02 ND 0.01 ND ND 0.0052 ND ND ND ND ND ND ND 15.38 37 28 !1 14 0.002 ND 37 TPH 4.1 13 1.3 4 0.354 12 29 0.6 0.022 <0.05 <0.05 <0.05 <0.010 <0.05 <0.05 <0.05 33.4 170 7O 56 61 <0.05 <0.05 240. 03/05/88 0.6 4.2 3.7 42 100. 03/05/8~dup) 0.9 5.6 2.3 29 70. 03/13/89 .......... Tvoe Diesel #2 Gasoline Gasoline Gasoline and Diesel #2 Diesel #2 Weathered gasoline Gasoline Gasoline Gasoline Gasoline Gasoline Gasoline Gasoline 0.3' free produc! Gasoline Gasoline 0.1' free product .aValues from Twin City Testing Corporation, report, dated July 9, 1987. bND = Not delected. . - -- = Not sampled due to presence of free product. SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK Davies Oil Company 3305-1/2 Gulf Street Bakersfield, California Delta Projecl; No. 40-87-326 Page 7 $.0 PROPOSED ADDITIONAL WORK During the next six months, Delta will undertake the following: Additignal Monitoring Well~--Figure 3 (Site Vicinity Map) indicates ideal locations for installing proposed monitoring wells MW-13 through MW-15. The locations were revised based on the most recent quarterly monitoring report. These wells are proposed to define the off site extent of dissolved hydrocarbons in ground water. Wells MW- 13 through MW- 15 will be installed if and when right-of-entry is obtained from adjacent property owners. MW-16 will be installed on site to monitor the effect of water discharge to the infiltration gallery. Additional Site Assessment--As requested in the MRP issued to Davies Oil Company (Regional Board letter, dated March 13, 1989), Delta proposes utilizing underground storage tank removal soil sampling to assess the probability of hydrocarbon migration in soils at the site when Davies Oil Company replaces the tanks between wells MW-2 and MW-3 sometime this summer. The Regional Board Will be notified prior to the event. The data collected from soil sampling will be used to scope additional assessment if necessary. Vapor Extraction System (VES)--A VES is proposed to be installed after as much free product is removed as possible (probably after 3 months of pumping). The VES is planned to use wells MW-I, RW-I, MW-I l, MW-12, and one additional well to be installed in the vicinity of the leak as shown in Figure I (Site Map). Detailed plans will be submitted by August 2, 1989. Ground Water Treatment System--The ground water treatment system installation should be completed and operational by the first week in June 1989. The procedures outlined in the MRP will be followed after start-up of the water remediation system. Influent and effluent water samples will be collected and analyzed weekly for the constituents mentioned until the ability of the treatment system to comply with adopted waste discharge requirements is established. The reporting requirements will be in accordance with the MRP. SEMIANNUAL GROUND WATER MONITORING REPORT AND PROPOSED ADDITIONAL WORK Davies Oil Company 3305-1/2 Gulf Street Bakersfield, California Delta Project No. 40-87-326 Page 8 6.0 REMARKS/SIGNATURES The recommendations contained in this report represent our professional opinions, and are based in part on information supplied by the client. These opinions are based on currently available · information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended. DELTA ENVIRONMENTAL CONSULTANTS, INC. This report was prepared by: Sudhaker R. Talanki Civil Engineer Date Mi~thiel M. Westerheim Project Engineer Date The work performed in this report was done under the supervision of a California Registered Geologist: /cm Brian L. Krog~ng ~' California Registered Geologist #2303 Date o # # 22 Oi~ Sum~ o I Lo NORRIS o Primary Sch ~ Tank.~ ~ o Dil Sum~'~ ~' · '23 =. ~ o°% ~ o ! '" ,I.. '. 'Beardsley · / School. , .~o . /Drive.in ;,' Theater GENERAL NOTES: BASE MAP FROM U.S.G.S. OILDALE, CA. 7.5 MINUTE TOPOGRAPHIC QUADRANGLE LOCATION INorth o 2ooo FT SCALE I ' 24,000 ADelta Environmental Consultants, Inc. FIGURE 1 SITE LOCATION MAP DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD, CA. DRAWN BY:/~ ~l=l~, NO. 40-87-326 CHK BY: .5 ~' T- 5/~"~/~/ JOB GATE INFILTRATION GALLERY (COVERED SURFACE) GRAVEL DRIVEWAY ~MW-16 TIRE STORAGE OFFICE ~ MW-5 TRAILER PARK PUMP ISLANDS OFFICE E ~MW-3 BATHROOk UNLEADED REGULAR D~ESEL UNDERGROU STORAGE TA GRAVEL DRIVEWAY KERNVILLE STAGE AND FREIGHT LINES /~OIL ANK 4 IN BURIED WATER DISCHARGE LINE TO ~~- INFILTRATION GALLERY (2 FI BELOW GROUND) co.o. ~^ol ~- ~, ~x~,~ Pt~P AND VAPOR AND · _/.~ .~ SHED-~ PRODUCT LINES / ~'~EAK~-'~- / SEPTIC /~/ ~ CONCRETE · TANK .,.~/~'"~ --- /PAD oov. ,~,, I I -; ~ ~1 ~ I I ./ VA~R AND ~ J L J I I xx PROD~T UNES ', · l ~-~ MW-,¢ HOUSE LEGEND: '~ RW-1 ~ MW-1 (D MW-iS · P-1 NOTE: A REV.1/20/89 BLK GRAVEL CONCRETE PAD FOR WATER TREATMENT SYSTEM RECOVERY WELL LOCATION MONITOPJNG WELL LOCATION PROPOSED MONITORING WELL LOCATION DRY WELL PIEZOMETER LEAK SITE SURVEYED MAY 2, 1988 0 40 FT SCALE Delta Environmental Consultants, inc. FIGURE 2 SITE MAP DAVIES OiL 3305 1/2 GULF STREET BAKERSFIELD, CA. BY; JOB NO. 40-87-326 PIERCE ~ARKING OPEN SPACE A-1 BATTERY SERVICE DRIVEWAY ACCO CABLE SPLICING MW.15~ PIPE STORAGE MW-14 SUPPLY MW-S(~ N.D.(B) <0.05(TPH) MW- N.D.(B) " <0.05(~ $- ~AD North TEAMSTERS LOCAL UNION NO.$7 ABANDONED PFIIVATE WELL TRUCK WASH RUSH SWOAPE PROPERTIES O.033(B) KERNVILLE STAGE AND FREK~HT OPEN ~ PARKING RUSH SWOAPE PROPERTIES BUILDING KEN CUMMINGS' DIESEL ~ 0.005(B ) UNDERGROUND rSTORAGE OFFICE BU~.D~G MW-5 OFFICE MW-10 · ti~N.D.(B) O.05(TPH) STORAC.~ rANK TRAEERPARK ISLANDS t~Mw'16 INFILTRATION GALLERY (COVERED SURFACE) LEGEND: i~ MW-~ ~ RW-1 (~)M .W-14 0.005(B) 4(TPH) N.D. MONITORING WELL LOCATION RECOVERY WELL LOCATION DRY WELL LEAK PROPOSED MONITORING WELL LOCATION BENZENE CONCENTRATION IN PARTS PER MILLION TOTAL PETROLEUM HYDRO- CARBON CONCENTRATION IN PARTS PER MILLION NOT DETECTED INFERRED EXTENT OF FREE PRODUCT PLUME INFERRED EXTENT OF DISSOLVED HYDROCARBONS POSSIBLE OLD DIESEL PLUME 0 100 FT SCALE ADelta Environmental Consultants, inc. FIGURE 5 INFERRED HYDROCARBON PLUME MIGRATION MARCH 13, 1989 3305 112 GULF STREET BA',.'.£~SFIELD, CA. INFILTRATION GALLERY (COVERED SURFACE) GRAVEL DRIVEWAY (~tMW. 16 GATE TIRE STORAGE OFFICE 5 (389.30) GRAVEL DRIVEWAY TRAEERPARK PUMP ISLANDS I~THRO~ OFFICE UNLEADF. Z R~AF DIESE UNDERGROt STORAGE T,~ KERNVILLE ~rAGE AND FREIGHT LINES MW -4 (389.42)  GATE UNDERGROUND~ · TANK GRAVEL ~CONC. PAD L~ TANK ~.'~ -- L ~ ~i ~ ~ vA~ ~ / ~ .-- ~w-~ ~ ~(38a.98) ~T L~ ~ ~~K / / / / ~ / I /~ T~ ~~ ~ / ' I ~_' ' ' I I . ~ ~ VA~R AND I / / .c i ['- ~ / ~' I Mw~ / LE~ ~~ ~ ~ / · } ~ ~ ~ RW-1 RETRY WELLLO~T~ ~ I ~ j ~ I · MW-1 M~TOR~G WELL LO~TION I I L_~ ~ ~ ~ MW'16 PRO<SED MONITORING WELL LOCATION ~'[~8.86)'-- -. _.. _ ] ' (3~.86)MW'2 GR~ WATER ELEVATI~ IN FEET . . ~88~;~1 ABlE MEAN S~ LEVEL ' . ~ I -~9.1- ~~C~T~INFEETsEA LEVEL ~ ~5 1) ~TE ~VEYED MAY 2, 1988 /- 2) FREE ~T C~RECTI~ APPLIED TO MW-11 AND (388.40) MW-12. SPEClFIC GRAVITY = 0.75 ADelta Environmental Consultants. Inc. FIGURE 4 WATER TABLE CONTOUR MAP - 3/13/89 DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD, CA. JOB NO. 40-87-326 PARKING SERVICE OPEN SPACE ACCO CABLE SPLICING DRIVE WAY UPS BUILDING t UILDINC~ BUILDING MW.15O UPS STORAGE MW-14 JIM'S STEEL AND' SUPPLY PIPE STORAGE PIERCE R( COVERED STORAGE CITY R.O.W~ GUILD PR · [u [ ~ BAKEF ENV~ PLANTERS MF( L OWNER: I CYRIL ANDREI PARKING ~_ AREA BAKEF MAINTE PLANTERS OPEN MW-8~ MY' North TEAMSTERS RUSH SWOAPE LOCAL UNION PROPERTIES NO.87 vATE TRUCK )ENCES WASH , ABANDONED BUILDING PRIVATE WELL ~ KEN : CUMMINGS RUSH SWOAPE DIESEL ~FIELD: PROPERTIES I LOPE KERNVILLE STAGE CO. AND FREIGHT OPEN LQ]'. BUILDING ~MW-9 TRUCK PARKING ~FIELD lANCE /ICE MW-I~ MW-2 OBILE ~ ~ UNDERGROUND ~FETY //STORAGE MW-5 co. n,,///'t TA.KS .w-~_ U',~// PACE ~ TRAILER OFFICE ;. OFFiCE'" r~'r.~ ~ BUILDING RW-1 , IIII t,J LJ k~LEAK MW-3 ,~ ~,_ eMW"° O,L ' == -- ~ / PUMP STORAGE ~ ' ~ERGROUND INFILTRATION GALLERY fORAGE (COVERED SURFACE) TANK TRAILER PARK LEGEND: ~ MW-1 MONITORING WELL LOCATION ~ RW-1 RECOVERY'WELL LOCATION ~ DRY WELL ~) LEAK (~) MW-14 PROPOSED MONITORING WELL LOCATION 0 100 FT SCALE Delta Environmental Consultants, Inc. FIGURE 3 SITE VICINITY MAP DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD, CA. BY: JOB NO. 40-87-326 1xIR. WATER & HAZARDOUS WASTE I ~RATORY (No.131) CERTIFIED by CA '~RNIA DEPT of HEALTH SERVICES CentraZ I Coast . Analytical[ Services ATTN: Mike Westerheim Delta Environmental 11~38 White Rock Rd. Suite 118 Rancho Cordova, CA g5678 Central Coast Lab Number: F-83115 · AnoZyttca[ Services, Inc. CoZZected: 83/13/89 141 Suburban Road , Suite C-4 Received: 83/14/89 San Luts Obtspo, CaZtfornta 93481 Tested: ~3/17/89 (885) 543-2553 CoZZected by: S. Talank~ Fue[ F~ngerpr~nt AnaZysis - EPA lvlethod 826~ EXTRACTED BY EPA METHOD 5838 (purge-and-trap) SAMPLE DESCRZPTZON: Davies 0tZ Co., #4~-87-326, 85Z-9, Water Compound Ana[yzed Detection Limit Concentration in ppm (PQL)" in ppm Benzene Toluene Ethy[benzene Xylenes 1,2-Dtchloroethane (EDC) Ethylene D~brom~de (EDB) ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) <8.85 BTX as a Percent of Fuel not appilcobIe Percent Surrogate Recovery 8#. *(Practical Ouontltatlon L/m/t) 85/28/89 F83115~.~r1/38 MH/gb/~c/t! RespectfulZy submi%ted, CENTRAL COAST ANALYT/CAL SERVZCES ~lary HavIicek, Ph.D. Presldent ~R, WATER & HAZARDOUS WASTE LA[ )TORY (No.151) CERTIFIED by CALI '~IA. DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 11~$e White Rock Rd. Suite 11~ Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~3116 Analytical Services, Inc. ColZected: ~3/13/89 1~1 Suburban Road , Suite C-~ Received: ~/1~/89 San Luis Obispo, CaZifornia 9~kB1 Tested: ~/17/89 (895) 5~3-2555 Collected by: S. Ta~anki FueZ Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~$E (purge-and-trap) SAMPLE DESCRZPTZON: Davies Oil Co., MW-8 #k~-87-~26, 85Z-9, Water Compound Analyzed Detection Limit Concentration in ppm (POL)# ~" in ppm Benzene Toluene Eth¥1benzene Xylenes 1,2-Dichloroethane (EDC) Eth¥Iene Dibromide (EDB) ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE') <~.~5 BTX os a Percent of Fuel not applicable Percent Surrogate Recovery 81. #(Practical Ouontltation Limit) e$/28/89 F~3116f,wrl/$8 MH/tz/Sc/tl RespectCully submitted, CENTRAL COAST ANALYTZCAL SERVZCES ~ry Havl~cek, Ph.D. President AIR, WATER & HAZARDOUS WASTE L, )ATORY (N0.151) CERTIFIED by CAI RNIA DEPT of HEALTH SERVICES Central Coast Services ATTN: M£ke Westerhe~m DeLta Environmental 1193g White Rock Rd. Suite 11e Rancho Cordova, CA 9557~ Central Coast Lab Number: F-~3117 Ana[yttca[ Services, Inc. Co[[ected: ~3/15/89 141 Suburban Road , Suite C-4 Received: ~3/14/89 San Lugs Ob~spo, Cm[tfornta 95~1 Tested: ~[17[89 (8e5) 543-2553 CoLLected by: S. ToZanki Fuel F~ngerprint AnaZys~s - EPA Dlethod 826E EXTRACTED BY EPA mETHOD 5~3~ (purge-ond-~rap) SAMPLE DESCRIPTION: Davies OiL Co., t~/-9 #4~-87-526, 83Z-9, Water Compound Analyzed Detect[°n Limit tn ppm (PQL)* Concen~ration .... ~n ppm Benzene ~.~2 ToIuene ~.~2 ~.12 Ethyibenzene ~.~2 2.2 XyIenes ~.02 11. 1,2-D~chIoroethone (EDC) ~.~2 not found EthyIene Dibrom~de (EDB) ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS 1. (GASOLINE) 56. BTX as a Percent of Fuel 2~. Percent Surrogate Recovery 92. *(Proct~coI Ouantltatton Limit) f~/28/89 F~3117¢.wr1/38 ~H/~z/jc/t~ Respectfully subm£tted, CENTRAL COAST ANALYTICAL SERVZCES I~ry HavZ~cek, Ph.D. President APPENDIX A Analytical Laboratory Results DELTA Sampl~:i Identification/Reid,, Chain of Custody R~,, ENVIRONMENTAL CONSULTANTS, INC. .,' *~ M N-2_. ~ ~J- 3 ' ~)ll~ Samples) (signature) ** : [. I~IL~ 3- oZ, 14 ~oI Attention of: ./,".1 /~f/-V-~. ~[4-._~; ~"/t,t-c~. ! H~zardous materials suspected? (yes/no) 3-/~ Sealed for shipmem by: (signature) Received for Lab by: (signature) · Receiving Lab~. Please return odgi~i from after ~ for receipt of lample~. ~IR, WATER & H&ZARDOUS WASTE LA~q~ATORY (No.1)1) CERTIFIED by CAL*'=~RNIA DEPT of HEALTH SERVICES -] ICentrol Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 11g$~ White Rock Rd. Suite 11~ Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~$115 Analytical Services, [nc. Collected: g3J13/89 1~1 Suburban Road , Suite C-~ Received: ~3/14/89 San Luis Obispo, California 934~1 Tested: ~/17/89 (8~5) 5~$-255~ Collected by: S. Talonki Fuel Fingerprint Analysis - EPA Hethod 826~ EXTRACTED BY EPA METHOD 5~5~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil Co., M~-2 #~-87-326, 85Z-9, Water Compound Analyzed Detection Limit ~n ppm (PQL)* Concentration ~n ppm Benzene Toluene Ethyibenzene Xyienes 1,2-Dlchloroethone (EDC) Ethyiene Dlbromide (EDB) ~.e2 not ~ound e.~2 not found' not ~ound TOTAL PURGEABLE PETROLEUM HYDROCARBONS 1. (GASOLZNE) BTX os o Percent of Fuel 1.1 Percent Surrogate Recovery 8~. *(Procticol Quontitation Limit) MSD~3 ~/28/89 F~3113f.wr1/38 mH/jc/jc/tl Respectfully submitted, CENTRAL COAST ANALYTZCAL SERVZCES Mary Hav~cek, Ph.D. President ~IR, WATER & HAZARDOUS WASTE LA" "~ATORY (No.131) CERTIFIED by CAL~"~NIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 11~$¢ White Rock Rd. Suite 11¢ Rancho Cordova, CA 9567¢ Central Coast Lob Number: F-~311~ Analytical Services, [nc. Collected:. 1~1 Suburban Road , Suite C-~ Received: San Luts Obispo, California 934¢1 Tested: ~3/25/89 (8~5) 543-2553 Collected by: S. Talankt Fuel Fingerprint Analysts - EPA Method 826¢ EXTRACTED BY EPA METHOD 5¢3¢ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil Co., #4¢-87-326, 85Z-9, Water Compound Analyzed Detection Limit in ppm (PQL)# Concentration tn ppm Benzene Toluene Ethylbenzene Xylenes 1,2-D~chloroethone (EDC) Ethylene D~brom~de (EDB) ¢.¢¢¢2 not found not found not found not found not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS (WEATHERED GASOLINE) ¢,6 BTX as a percent of Fuel not appltcable Percent Surrogate Recovery 127. #(Practical Quantitation Limit) F¢3114f.wr1/4~ MH/jg/re/tl Respectfully submitted, CENTRAL COAST ANALYTZCAL SERVICES President miR, WATER & HAZARDOUS WASTE t .~ATORY (No.131) CERTIFIED by CA RNIA DEPT of HEALTH SERVICES Central Coast Analytical Services A~-rN: Mike Westerheim Delta Environmental 11555 White Rock Rd. Suite 115 Rancho Cordova, CA 95675 Central Coast Lob Number: F-55118 AnclyticcZ Services, Inc. Collected: 55/13/89 141 Suburban Rood , Suite C-~ Received: 55/1~/89 San Luis Obispo, Colifornio 95451 Tested: 55/18/89 ' (855) 5~5-2553 CoZZected by: S. TaZcnki FueZ Fingerprint Anoly$is- EPA ~ethod 8265 EXTRACTED BY EPA METHOD 5555 (purge-ond-trcp) SAMPLE DESCRIPTION= Davtes Oil Co., M~-15 #~5-87-526, 85Z-9, Water CompOund Analyzed Detection Limit in ppm Concent~ation .- ~n ppm Benzene 5.5552 not found Toiuene 5.552 not found Ethylbenzene 5.5~2 not found Xylenes 5.~2 not found 1,2-Dichioroethane (EDC) 5.55~2 not found Ethylene Dibromide (EDB) ~.~0~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) <~.e5 BTX as a Percent of Fuel not applicable Percent Surrogote Recovery 1~6. #(Procticol Ouantitatton Limit) MSD~6 53/29/89 F53118f.wr1/39 MH/gb/jc/tl Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Hcvlt~cek, Ph.D. President WATER & HAZARDOUS WASTE L/ ~ATORY (No.131) CERTIFIED by CA[ '~RNIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 11~3~ White Rock Rd. Suite 11~ Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~$119 Analytical Services, Inc. Collected: ~3/1~/89 lkl Suburban Road , Suite C-~ Received: ~3/1~/89 San Luis Obispo, California 95~1 Tested: ~$/18/89 (8~5) 5~-2555 Collected by: S. Talanki Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~ (purge-and-trap) SAMPLE DESCRIPTION: Davies 0il Co., Baker Tank #k~-87-$26, 85Z-9, Water Compound Analyzed' Benzene ToIuene Ethylbenzene Xy~enes 1,2-Dlchloroethane (EDC) Ethylene Dlbromide (EDB) Detect,on Limit in ppm Concentration .... in ppm not found not found not found not found not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) <~.~5 BTX os o Percent of Fuel not applicable Percent Surrogate Recovery 1~1. *(Practical Ouantitotion Limit) ~SD~6 ~/29/89 F~3119f.wrl/39 MH/gb/~c/tl Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President :iR. WATER & HAZARDOUS WASTE L, '~ATORY (No.131) CERTIFIED by CAI ,"~RNIA DEPT of HEALTH SERVICES Centra[ Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 11~$~ White Rock Rd. Suite 11~ Rancho Cordova, CA 9567~ Central Coast Lob Number: F-~5117dup Analytical Services, Inc. Collected: ~5J13/89 lkl Suburban Road , Suite C-k Received: ~/14jgg Son Lugs Obispo, CaZi~ornia 9~1 Tested: ~/17/89 (8~5) 5~5-255~ Collected by: S. Ta[onk~ Fuel Fingerprint Ana[ysis - EPA ~ethod 826~ EXTRACTED BY EPA ~ETHOD 5~$~ (purge-and-trap) SAJ~PLE DESCRZPT[ON: Davies Oil Co., ~-9, Duplicate Analys~s ~-87-~26, 85Z-9, Water Compound Analyzed Detect~on L~mit ~n ppm (pQL)# Concentration tn ppm Benzene ~.~5 Toluene ~.~5 ' Ethylbenzene ~.~5 2.5 Xylenes ~.~5 1~. 1,2-Dlchloroethane (EDC) ~.~5 not found Ethylene Dibromide (EDB) ~.~5 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS 5. (GASOLINE) 61. BTX as a Percent of Fuel 25. Percent Sucrogate Recovery 85. *(Practical Ouantitation Limit) ~SD~3 ~5/28/89 Fg3117~d.wrl/38 MH/tz/jc/t[ Respectfully submltted, CENTRAL COAST ANALYTZCAL SERVZCES y ~ Ph.D. President o Primary Sch ~ ~ ' BM l.,, 2 - tt 'Beardsley ! School , '23 GENERAL NOTES: i North BASE MAP FROM U.S.G.S. OILDALE, CA. 7.5 MINUTE TOPOGRAF~C QUADRANGLE LOCATION 0 2000 FT SCALE I: 24,000 13 · /Drwe-in .,' Theater · , ~..~:.=:__.~. =:., CA~ .' , Boil Perk Has FIGURE 1 SITE LOCATION MAP DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD, CA. 40-87-326 LH. 5!12189 A Me SRT 5125189 ~ TRAI~ER PARK GRAVEL OF#VEWAY TIFIE ~TO~A~ GRAVEl. DRIVEWAY ~ ,, ~ T I-' STORAGE TANKS I I KERNV1LLE STAGE ~ FREIGHT LINES 4 IN BURIED WATER DISCHARGE LINE TO INFILTRATION GALLERY (2 FI BELOW ~) ~OCXJCT LINE~ //// LEAK,~ OVERHEAD ELECTRIC POWER SUPPLY (~ ~ ELECTRIC CONTROL PANEL FOR TREATMENT SYSTEM EXTRA UNLEADED '--~WATER GRAVEL  CONCRETE PAD FOR WATER ..~. 18F~T~NT SYSTEM ~-8 TO! AIR STRIPPER INLET(~ SEPTIC /2/ ~ CONCRETE ~ // I I TR~ . ~' ~i ~'" WATER AND PR~CT P~P WITH F- ~ ff-~/ I I .... / ~ ~ I ~ AUT~AT~ LEVEL CONTROLS I~ WELL ~ R , I I ~ ~v~ ~ ~~T ~ T~ I II I ~. JL d J ~ / ~ ~s (~ ~LL~ C~TY) / '1 GRAVEL MW-l: AIR STRIPPER PUMI (AUTOMATIC FLOW CONTROL) FETER CARBON FILTERS (2 IN SERIES) lj~ MW-1 MO~T~ WELL LOCATION (j) MW-16 ~SED MONITORING WELL LOCATION (~) DRY WELL · P-1 PIEZOMETER (~' LEAK NOTE: srrE ,~JRVEYED MAY 2, 1~ 0 4OFT SC. ALE FIGURE 2 GENERAL LAYOUT OF WATER TREATMENT SYSTEM DAVES 3305 1/2 GULF STREET BAKERSFIELD. CA. ~ 'mO,. SRT 81111~ ~ 4o-87.3~ j Pm,~im~ m' BLK 8/18/89 I~ (BXO'N 39¥UO/g 3~d L MOqd B3£¥M · '933zg NOI.Li)3BIC) MOqJ I:I3/VM ClNnOUcO $3:::)N3OIS3B 3/¥AIJ:k:l I AVM 3AIBO V~~l~J' 3OValS 3qSVO 3~AU3S L-¥ O' N~ S'14qu3 J.¥1a NOLLOfldd 31dS'd3)4Vl~ ~llMUYd QVO~d 3O~d31d TEAMSTERS RUSH SWOAPE LOCAL UNION PROPERTIES NO.87 ; TRUCK WASH ABANDONED BUll. DING 'PRIVATE WELL i KEN CUMMINC~ ~, RU6H SWOAPE DIESEL ~ 'iKERNVILLE STAGE PROPERTIES ,,--..--.. /~ ANO FREIGHT .//aw:;/ TRUC~ PARK~ IND BURIED DISCHARGE LINE TO INFILTRATION GALLERY INFILTRATION GALLERY (COVERED SURFACE) TRAILER PARK North LEGENd. MOMTORING WELL LOCATION RECOVERY WELL LOCATION DRY WELL LEAK STAGNATION POINT 112 WE)TH OF CAPTURE AT WELL PIEZOMETER I~OPOSED II,,IONIT~ ~ LOCATION BENZENE CONCENTRATION IN MARCH 1989 IN PARTS PER MELLON TOTAL PETROLEUM HYDROCARBON CONCENTRATION IN MARCH 1989 IN PARTS PER MILLION NOT DETECTED IM:ERP, ED EXTENT OF FREE PRO(~.ICT PLUME II~'ERRED EXTENT OF DISSOt.VED HYDROCARBONS POSSIBLE OLD OIESEL PLUME THEORETICAL CAPTURE ZONE 0 100 FT SCALE FIGURE 3 THEORITICAL CAPTURE ZONE FOR RW-1 PUMPING 30 GALLONS PER MINUTE DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD. CA. 40-87-326 SRT 8117/8g BLK 8/18/89 3M E)Nldl~ifld 'IVN.LO¥ (8 XB NOI/VI:LL'II-INI gNIdl~ll'ld ~1 I.-Mbl (I. :S3J.ON S3Nn J.I-FOi31::I:I (]NY ::I~)¥J.S :i'I'IlANU:IN AYMMAIWa '13AVb'cO MOld:lO I:' 3=OYb'OJ.S 31dU. s[.'Miq(D AYM3AIIda 93AVI::ICO (3Ovduns O3B3AOO) AI:13TIV~ NOI.L¥I:t/'lldNI Z/" + + + + + ,, iV ~d~) OL IV i::I3.LVM 9NI.LYBIgldNI HOV"-J S993M NOIIY9~IS 4 IN BURIED WATER DISCHARGE LINE TO INFILTRATION GALLERY (2 FT BELOW GROUND) j~W-10 :)IL , VAPOR AND ~ROOUCT LINES CONC. PAD 1 //// LEAK.,'T MW-4 MW-1 RW-1 SE'!~TIC /~/' ~ CONCRETE h--',,.r.- ,. ,.., ,, ..,... " "I I I /'1"~VAPORAND /~ I' I"~ ' L .~ I L// PP, ODt~T LINES ~ i: ~-'~ ~[ I Mw.~ I // IL:.! GRAVEL ~PING~00 GALLONS PER MINUTE (GPM) AND 100 GPM ~ BY ~ WELLS IN INFILTRATION GALLERY. TION,~',I~POSE ONLY 4P~I(~ATE OF RW-1 IS 30 C-.-.-.-.-.-.-.-.-~ PINGj~ATE OF RW-1 IS 50 GPM MAXIMUM MW-! EXTRA [UNLEADED I I ! I I I RECOVERY WELI~ RW-1 PUMPING AT 100 GPM ~ MW-1 (~) MWo16 ® · P-~ NOTE: GRAVEL ~ c ~"ETw~°  TREATMENT SYSTEM ~MW-8 :' '~ J RECOVERY WELL LOCATION MONITORING WELL LOCATION PROPOSED MONITORING WELL LOCATION DRY WELL PIEZOMETER LEAK SITE SURVEYED MAY 2, 1988 0 40 FT SCALE FIGURE 4 SIMULATION TO DETERMINE EFFECT OF INFILTRATION DISCHARGE DAVIES C~L 3305 1/2 GULF STREET BAKERSFIELD, CA. 40-87-326 BLK 8/18/89 I APPENDIX A Laboratory Reports iii DELTA "~ample k~ei~tir=a.°n/,F=~d' ch-aJ~'of ~tody Record ENVIRONHENT^L CONSULTANTS. INC. "' ~,'~ '~' '),." j ' '"', Attention of: /.~;./;-'T~ Hazardous materials sushi'till? Sam~e No. of Ana~/~ Field ID # Date Type Containem Required -..'*'_ ', . , ' · ,. ;,-.: ...,fi ?-- Sampte~s) (signature) Sealed for shipment by: (signature) Received fo~ Lab by: (signature) -? R~d b~. (~nat~n) .+ Receiving ~ory: Please return original form after signing fa' receipt of samples. iIR, WATER & HAZARDOUS WASTE LABORATORY (No.g~&lS1) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: C. Brandon Poteet Delta Environmental 333~ Data Drive Rancho Cordova, CA g567~ Central Coast Lab Number: F-~9623 Analytical Services, Znc. Collected: e7/2e/89 1~1 Suburban Road , Suite C-~ Received: g7/21/89 San Luis Obtspo, California 95~1 Tested: ~7/21/89 (8~5) 5~3-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~5~ (purge-and-trap) SAMPLE DESCRZPTZON: D~-87-326, F#85Z-9, Davies Oil Co., Airstripper /nfluent, AS1~72~89, 1~:~, Water Compound Analyzed Detection Limit in ppm (PQL)# Concentration in ppm Benzene ¢.¢¢1 ¢.¢5 Toluene ¢.¢1 0.5 Ethylbenzene ¢.¢1 Xylenes ~.~1 ~.8 1,2-Dlchloroethane (EDC) ~.~1 not found Ethylene Dibromide (EDB) ~.~1 not found Carbon Tetrachloride ~.~1 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) 2.7 BTX as o Percent of FueI 45. Percent Surrogate Recovery 97. *(Proctlcoi Ouontitotlon Limit) MSD~7 ~7/31/89 F~g623f.~r1/116 MH/jZ/jc/tl Respectf'ully submitted, CEN]'RAL COAST ANALYTX. CAt_ SERVTCES Mary Havlicek, Ph.D. President .1IR, WATER & HAZARDOUS WASTE LABORATORY (No.9~&l`51) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES i } 1 Cen[~a[ Coast Ana[y[~ca[ Services ATTN: C. Brandon Poteet De[ta Environmenta! 3336 Data Drive Rancho Cordova, CA 95676 Centr,al Coast .Lob Number`: F-69625dup Analytical Services, Inc. Collected: 67/26/89 1~1Subur,ban Road , Suite C-~ Received: 67/21/89 San Luis Obispo, California 9~61 Tested: 67/21/89 (865) 5~3-2553 Collected by: C.B. Poteet Fuel Fingerpr,int Analysis - EPA Method 8266 EXTRACTED BY EPA METHOD 5636 (put,ge-and-trap) SAMPLE DESCRIPTION: D~6-87-326, F#85Z-9, Davies 0il Co., Air,str,ipper, Influent, ASI672689, 16:66, Water Duplicate Analysis' Compound Analyzed Detection Limit in ppm (POL), Concentr,otion in ppm Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroe[hone (EDC) Ethylene Dlbromide (EDB) Carbon Tetrochlorlde 1~.`51 I~.11 6.8 not found not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) 2.7 BTX as o Percent of Fuel 4.5. Percent Surrogote Recovery 94. *(Proctlcol Ouontitotlon Limit) MSD#7 67/31/89 F69623fd,wr1/116 MH/jZ/jc/t! Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mar'y Havlicek, Ph.D. AIR, WATER & HAZARDOUS WASTE LABORATORY (No.g~&131) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coas~ Ana~yt~ca~ Services ATTN: C. Brandon Poteet Delta Environmental 333~ Data Drive Rancho Cordova; CA 9567~ Central Coast Lab Number: F-~962~ Analytical Services, Znc. 'Collected: ~7/2~/89. 1~1 Suburban Road , Suite C-~ Received: ~7/21/89 San Luis Obispo, California 95~1 Tested: ~7/21/89 (8~5) 5~3-2553 ColZected by: C.B. Poteet Fue/ Fingerprint AnaZysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5939 (purge-and-trap) SAMPLE DESCR/PTZON: D~g-87-$26,~F#85Z-9, Davies 0il Co., Airstripper ~fluent, ASE~72989, 1~:15, Water Duplicate Analysis -~T sl~ls~l ~ L~ei!,'n~ ¢~e4.~ Compound Analyzed Detection Limit in ppm (PQL)# Concentration in ppm Benzene ~.~2 not found Toluene ~.~2 not found Ethylbenzene ~.~2 not found Xylenes ~.~2 not found 1,2-Dichloroethane (EDC) ~.~2 not found Ethylene D/bromide (EDB) ~.~2 not found Carbon Tetrochloride ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.1 (GASOLINE) BTX as o Percent of Fuel Percent Surrogate Recovery not applicable 97. *(Practical Quantltatlon L/m/t) MSD#7 F~962~.wr1/116 Respectfully submitted, President AIR, WATER & HAZARDOUS WASTE LABORATORY (No.90&lS1) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES i Central Coast Analytical Services ATTN: C, Brondon Poteet Delta Environmental 335~ Data Drive Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~9625 Analytical Services, Inc. Collected: ~7/2~/8g 1~1 Suburban Road , Suite C-k Received: ~7/21/89 San Luis Obispo, California 93~1 Tested: ~7/21/89 (8~5) 5~3-2555 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRIPTION: D~-87-$26, F#85Z-9, Davies 011 Co., Infiltration Gallery lnfluent, 1GI~72~89 1~:3 Duplicate Analysis Compound Analyzed Detection Limit in ppm (PGL)# Concentration in ppm Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethane (EDC) Ethylene D/bromide (EDB) Carbon Tetrachloride 0 ¢¢¢2 ¢ ¢¢2 0 ¢¢2 ¢ ¢¢2 ¢ ¢¢¢2 0 ¢¢¢2 0 ¢¢¢2 not found not found not found not found not found not found not found TOTAL'PURGEABLE PETROLEUM HYDROCARBONS (GASOLINE) BTX os o Percent of Fuel Percent Surrogate Recovery <¢.1 not applicable 1¢1 . *(Practical Ouantltotlon Limit) MSD#7 ~7/31/89 F~9625f.wrl/116 'Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LABORATORY (No.9~&131) CERTIFIED by CALIFORNIA DI~PT-O~-HEALTH SERVICES ") 3. IllJjr lf Central Central Coast Lab Number: ~ ' 5 Coast Analytical ~7/ Services Collected: Analytical 1~1 Suburban Road, Suite C-~ Received: _. Services San Luts Obispo, California 93~1 Tested: ~ (8~5) 5~3-255~ CoZlected by: C. Brandon Potee~~ ATTN: C. Brandon Poteet Sample Description: i Delta Environ~ntal Consultants ~-87-~26, F ~8~Z-9, Davies 0il Co., ~ 55~ Data Drive Airstripper influent, ASZ~72~89, Rancho Cordova, CA 9567~ 1~:~, ~ast~ater Digested by EPA Method ~2~ on ~7/25/89 by ~H. LAB NUMBER REPORT TOTAL SAMPLE DESCRIPT/ON LEVEL FOUND LEAD mg/1 EPA METHOD DETECTION LIMIT(POL)#* ..... DATE/ANALYST 7421 ~.~¢5 ~8/~1/89 RO' F-9625 ASI ~72~89 @ 1~ <~.0~5 F-9624 ASE ~72~89 @ 1~15 <~.~5 F-9625 IGI ~72~89 0 1~3~ <~.~5 **Practlcol Quant/tat/on Llmlt ***SOLUBLE THRESHOLD LIMIT CONCENTRATION os llsted in 22 Col Adm Code Article 11. Sec. 66699 os persistent ond blooccumuIotlve toxic substonce. ~8/~9/89 F9625DL.V/R1/#9~ ~H/lf Respectf'ully submitted, CENTRAL ,~~[CAL SERV]:CES ~~.cek, Ph.D., President DELTA Samitei Identif.mation/l=ield chain' of ~-u-~tody Record ENVIRONI~ENT^L CONSULTANTS, INC. Comments: Attention of: ~¢¢_.7~''' ~ ~, Hazardous materials suspected? Sampler(s) (signature) Field ID Sealed for shipment by: (signature) Received for Lab by: (signature) by:. Shipment method: I.~; ,:i ~...¢ :...,., ',/....:,/,..',-1 Comments / f,, Receiving Laboratory:. Please tatum original form after signing for receipt of samples. WATER & HAZARDOUS WASTE LABORATORY (NO.90&151) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: C. Brandon Poteet Delta Environmental 333~ Data Drive Rancho Cordova, CA 9567~ Central Coast Lab Number: F-E9291 Analytical Services, Inc. Collected: ~7/15/89 141 Suburban Road , Suite C-4 Received: ~7/14/89 San Luis Obispo, California 934~1 Tested: ~7/15/89 (8~5) 543-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5B3~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil Co., Delta #4~-87-236, Fed #83Z-9, Airstripper In~luent, Water Compound Analyzed Detection Limit in ppm (PQL)e Concentration in ppm Benzene ~.~5 ~.~43 Toluene ~.~5 ~.37 Ethylbenzene ~.005 ~.15 Xylenes ~.~05 ~.89 1,2-Dichloroethane (EDC) ~.~5 not found Ethylene Dlbromtde (EDB) ~.~5 not found Carbon Tetrachloride ~.~5 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) 2.6 BTX as a Percent of Fuel 5~. Percent Surrogate Recovery 99. #(Pract~caI Quant~tat~on L~m~t) MSD#7 ~7-26-89 F~g291f.wr1/111 MH/jm/jc/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LABORATORY (NO.g~)&131) CERTIFIED by CALIFORNIA DEPT 'of HEALTH SERVICE,'; Central Coast Analytica~ Services ATTN: C. Brandon Poteet Delta Environmenta! 3356 Data Drive Rancho Cordova, CA 95676 Central Coast Lab Number: F-~g291dup Analytical ~ .-vices, Inc. Collected: 67/15/89 141 Suburban Road , Suite C-4 Received: 67/14/89 San Luis Obispo, California 9~k61 Tested: 67/15/89 (865) 545-2553 CoiZected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 8266 EXTRACTED BY EPA METHOD 5636 (purge-and-trap) SAMPLE DESCRIPTION: Davies OiZ Co., DeIta ~46-87-236, Fed #8~Z-9, Airstripper Znfluent, Water DupZicate Analysis Compound Analyzed Detection Limit in ppm (POL)# Concentration in ppm 1 Benzene ~.~2 ~.6~5 Toluene ~.~2 ~.32 Ethylbenzene ~.~2 ~.16 Xylenes ~.~2 ~.89 1,2-Dlchloroethone (EDC) ~.~2 not found Ethylene D/bromide (EDB) ~.0~2 not found CorDon Tetrochloride ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.2 (GASOLINE)" BTX as o Percent of Fuel Percent Surrogote Recovery 2.5 5~. 111. *(Practical Quontltatlon Limit) MSD#7 67-26-89 F69291fd.wr1/111 MH/tz/jc/rh RespectfulZy submitted, CENTRAL COAST ANALYTTCAL SERVICES Mary Havlicek, Ph.D. President WATER & HAZARDOUS WASTE LARnRATORY (No.g~&lS1) CERTIFIED by ('^.LIFORNIA DEPT of HEALTH SERVICES ') Central Coos~ Analytical Services ATTN: C. Brandon Poteet Delta Environmental 3336 Data Drive Rancho Cordova, CA g5676 Central Coast *Lab Number: F-69292 Analytical Services, Inc. Collected: 67/13/89 141 Suburban Rood , Suite C-4 Received: 67/14/89 San Luis Obispo, California 934el Tested: 67/15/89 (865) 543-2553 Collected by: C.B, Poteet Fuel Fingerprint Analysis - EPA Method 8266 EXTRACTED BY EPA METHOD 5636 (purge-and-trap) SAMPLE DESCRIPTION: Davies Oi! Co., Delta #46-87-236, Fed #83z-g, Airstripper Effluent, Water Compound Analyzed Detection Limit in ppm (PQL)# Concentration in ppm 'l Benzene Toluene Ethylbenzene Xylenes 1,2-Dlchloroethane (EDC) Ethylene Dlbromide (EDB) Carbon Tetrochlorlde ~.~2 not found ~.g~2 not found ~.~2 not found ~.~2 not found 0.¢~2 not found ~.~02 not found ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) BTX os o Percent of Fuel Percent Surrogate Recovery <~.~5 not applicable *(Proctlcol Quontltotlon Limit) MSD#7 67-26-89 F69292f.wr1/111 MH/jm/jc/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President WATER & HAZARDOUS WASTE LABOR..~ATORY (No.9~&lS1) CERTIFIED by CAL..ZFORNIA DEPT Of HEALTH SERVICES ) r~ntral Coo~c Analytical Services ATTN: C. Brandon Poteet Delta Environmental 333Q Data Drive Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~9293 Analytical Services, Inc. Col/acted: ~7/13/89 1~1 Suburban Road , Suite C-~ Received: ~7/1~/89 San Luis Obispo, California 93~1 Tested: ~7/15/89 (8~5) 5~3-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~5~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oi! Co., Delta #~-87-256, Fed #85Z-9, Infiltration Discharge, Water Compound Analyzed Detection Limit in ppm Concentration in ppm Benzene Toluene Ethylbenzene Xylenes q,2-Dichloroethone (EDC) Ethylene Dibromide (EDB) Carbon Tetrachloride ~.'~02 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~02 not found ~.~2 not found ~.~2 not found 1 TOTAL PURGEABLE PETROLEUM HYDROCARBONS (GASOLZNE) <e.e5 BTX as a Percent of Fuel not applicable Percent Surrogate Recovery 98. *(Practical Ouantitatlon Limit) MSD~7 ~7-26-89 F~9295f.wr1/111 MH/tz/jc/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President ~IR,i WATER & HAZARDOUS WASTE LABO~TORY, (No.g~&131) CERTIFIED by CA~IFORNIA~,, DEPT of HEALTH SERVICES Central Coast Analytical Services Central Coast AnalyticaZ Services 141 Suburban Road, Suite Son Lugs Obispo, California (8;5) 543-2553 Lab Number: As L~sted Co~ected: ;7/13/89 Received: ;7/14/89 Tested: As L~sted CoZZected by: C. Brandon Pot;et ATTN: C. Brandon Poteet Delta Environmental 333; Data Drive Rancho Cordova, CA g567; REPORT S~mple Description: Project #4;-87-326, F#83Z-9 Davies 0il Co., Bakersfield CA Wastewater, Samples As Listed #DZGESTED BY EPA METHOD 3;2; ON ;7/16/89 BY AEA. LAB NUMBER EPA METHOD- DETECTION LIMIT(PaL)** ..... DATE/ANALYST **#STLC SAMPLE DES'CRZPTIUN LEVEL FOUND TOTAL LEAD mg/l 7421 ;J8/~1/89 / R,.1 5.~ i F-9291 Airstripper, ASID71389 13:3; <;.~5 F-9293 Infiltration Discharge, ID~71389 <~.~5 13:5~ **Practical Ouontltotion Limit *##SOLUBLE THRESHOLD LIMIT CONCENTRATION as Ilsted in 22 Cai Adm Code Art 11 Sec. 66699 os persistent & bloaccumuIatlve toxic substance. ;8/e2/89 F9291DL.WR1/#87 MH/ke RespectfuZly submitted, CENTRAL COAST ANALYTZCAL M President AUG - 4 I I~WIRO~AL CONSULTANTS, INC. Samp~s) (signature) Seak~d for sh~3mem by:. (signature) ReceiVed for Lab ~: (signature) I~te/Time ,W.o. # ~Z-o - ~ -7 - .~z_& Attention of: :iHazardous materials suspected? (~%) "]' O'T P l I E ~4 i? R~ ~~. P~eo ret.m odgirm! form .fret dgr, ing ~ receipt of ~ ilR, WATER & HAZARDOUS WASTE LABOR~TORY (No.131) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES ) Central Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 333~ Data Drive Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~9~27 Analytical Services, Inc. Collected: ~7/96/89 141 Suburban Road , Suite C-4 Received: E7/~7/89 San Luis Obispo, California 934~1 Tested: ~7/12/89 (8~5) 545-2555 Collected by: S. Talanki Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRIPTION: Davies 0il, Delta #~-87-326, Fed #85Z-9 Air Stripper Influent RW-1 Wellhead, Water Compound Analyzed Detection Limit in ppm (PQL)# Concentration in ppm Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethone (EDC) Ethylene D/bromide (EDB) Carbon Tetrachloride ~.~28 ~.29 ~.12 ~.82 not found not found not found I TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) 5.1 BTX os o Percent of Fuel 37. Percent Surrogate Recovery 122. *(Practical Quant/tot/on Limit) MSD#7 ~7-21-89 F~9~27f. wrl/11 ~1 MH/~l/~c/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LABORATORY (No.151) CERTIFIED by CALIFt~RNIA DEPT of HEALTH SERVICES -1 Central Coast Analytical Services ATTN: Mike Westerheim De/ia Environmental 333~ Data Drive Rancho Cordova, CA 9567~ Central Coast Lab Number: F-e9~2] Analytical Services, Znc. Collected: ~7/~6/8 1~1 Suburban Road , Suite C-~ Received: ~7/~7/8! San Luis Obispo, California g3~1 Tested: ~7/12/8! (8~5) 5~$-2555 CoZlected by: S. Tala~ Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRIPTZON: Davies 0il, Delta #~-87-326, Fed #83Z-9 Air Stripper Influent RW-1 Wellhead, Water Duplicate Analysis k:L Compound Analyzed Detection Limit tn ppm (POL)# Concentration in ppm Benzene ~.~5 0.~34 Toluene ~,~5 ~.32 Ethylbenzene ~.~05 ~.~97 Xylenes ~.~5 ~.67 1,2-Dichloroethone (EDC) ~.~5 not found Ethylene Dibromide (EDB) ~.~05 not found Carbon Tetrochloride ~.~5 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) 3.3 BTX as o Percent of Fuel 31. Percent Surrogate Recovery 94. *(Practical Ouontltotlon Llmlt) ~7-21-89 F~9e27~d. wrl/119 MH/jZ/jc/rh Respectfully submitted, CENT~COAST AN~L~YTZCAL SERVTCES Mary Havlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LABORATORY (No.131) CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: Nike Westerheim Delta Environmental $55~ Data Drive Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~9~28 Analytical Services, Inc. Collected: ~7/~6/89 1~1 Suburban Road , Suite C-4 Received: ~7/~7/89 gan Luis Obispo, California 954~1 Tested: ~7/12/89 (8~5) 545-2555 Collected by: S. Talanki Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil, Delta #4~-87-~26, F#83Z-9, Water Air Stripper Effluent Before 1st Carbon Dr~ Compound Analyzed Detection Limit in ppm (pQL)# Concentration in ppm Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethane (EDC) Ethylene Dlbromlde (EDB) Carbon Tetrachlorlde ~.~2 not found 0.~02 not found ~.~2 not found B.~2 not found ~.~2 not found ~.~2 not found ~.00~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) <e.~5 BTX as o Percent of Fuel not applicable Percent' Surrogate Recovery 97. *(Practical Ouantltotion Limit) MSD#7 ~7-21-89 Fege28f.wr1/11e MHljllJclrh Respectfully submitted, CENTRAL COAST ANALYTTCAL SERVTCES Mary Hovlicek, Ph.D. President lIR, WATER & HAZARDOUS WASTE LABORATORY (No.151) CERTIFIED by CAL)~NIA DEPT of HEALTH SERVICES I I -I J'. Central Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 333g Data Drive Rancho Cordova, CA 9567E Central Coast Lab Number: F-~gE29 Analytical Services, Inc. Collected: g7/~6/sg 1~1 Suburban Road , Suite C-4 Received: g7/g7/89 San Luis Obispo, California 93491 Tested: g7/12/89 (895) 5~3-2555 Collected by: S. Talanki Fuel Fingerprint Analysis - EPA Method 826g EXTRACTED BY EPA METHOD 5g~g (purge-and-trap) SAMPLE DESCRIPTION: Davies 0il, Delta #~g-87-$26, F#85Z-9, Water Infiltration Discharge After 2nd Carbon Draw Compound Analyzed Detection Limit in ppm (PQL)* Concentration in ppm Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethane (EDC) Ethylene Dlbromide (EDB) Carbon Tetrachloride ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS 0,~5 (GASOLINE) BTX as a Percent of Fuel Percent Surrogate Recovery <~.~5 not appilcable 87. *(Proctlcol Quontitatlon Limit) IflSD#7 Q7-21-89 FQg~2gf.wrl/11 ~1 mH/ji/jc/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES I~lary Havlicek, Ph.D. President iI R, WATER & HAZARDOUS WASTE LAP~'~ATORY (No.g~&151) CERTIFIED by P-~FORNIA DEPT of HEALTH SERVICES ) Central Coast Analytical Serv/ces Centra! Coast AnaIytical Serv/ces 1~1 Suburban Road, Suite C-~ San Lu/s Ob/spo, CaI/forn/a 93~1 (8~5) 5~$-2553 ATTN: M/ke Westerhe/m Delta Env/ronmenta! $33~ Data Dr/ye Rancho Cordova, CA 9567~ LAB NUMBER REPORT SAMPLE DESCRIPTION EPA METHOD DETECTION LIMIT(PaL)** ..... DATE/ANALYST **#STLC Lab Number: As L/$ted Collected: ~7/~6/89 Rece/ved: ~7/~7/89 Tested: As Listed Collected by: Sudlaker Talank/ SampZe Descr/pt/on: Project #~-87-326, 83z-9 Davies 0il, Wastewater Samples As L/sted DZGESTED BY EPA METHOD ~2~ ON ~7/1~/89 BY AEA. LEVEL FOUND TOTAL LEAD mg/i 7421 e.ee5 e7/2~/89/RJ 5.0 F-9027 Air Stripper, Influent ~.~06 RWl, Wellhead F-9029 Infiltration Discharge After Second Carbon Drum **Practical Quant/tat/on Llmlt ***SOLUBLE THRESHOLD LIMIT CONCENTRATION os listed in 22 Col Adm Code Art 11 Sec. 66699 os persistent & blooccumulotlve toxlc substance. 97/25/89 F9~27ME,WR1/#81 MH/ke RespectfuiZy submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D., Pres/dent EIWIRO~AL CONSULTANTS, INC. · .:.Samplf~ Identification/F'~ Chain of Custody Record I:~E( OVE/e.¥ t,,JELL. I-tE PU) Smmp~s~ls) (~Onmtum) w.o. # ~t.O-g-~- ~ ~-b' Attention oE Hazar~ ~ls t.J,,':~ i- f P-. ',-~ 'T,.Y'? f", ,- c: P/q ~,z6o ~-ccl4. WATER & HAZARDOUS WASTE LAr"~ATORY (N0.151) CERTIFIED by CAL' '"~NIA DEP~,~f~,HE?~_T.U. $~,2~'~-~-~--I Ih l Central Centra~ Coast Lab Nu~.~: ~'~S I .:'.L. 4 0 ,~0~ Ill III Coast AnalyttcaZ Services, Inc. CoZZected: ~6/29~8'~ IIV/I Analytical 1~1 Suburban Road , Suite C-~ Received: ~7/~89~ '~ ~ Services San Luis Ob~spo, Cal~orn~a 95~1 Tested: ~7/~/89 (8~5) 5~5-2555 Collected by: S. Ta[ank~ Fuel F~ngepp~n[ Ana[ys~s - EPA He[hod 826~ ATTN: Sudhakar Talanki Delta Environmental 11¢3¢ White Rock Rd. Suite 11¢ Rancho Cordova, CA 9567¢ EXTRACTED BY EPA ~ETHOD 5¢$¢ (purge-and-trap) SAMPLE DESCRIPTION: D~¢-87-$26, 85Z-9, Airstripper Influent, Recovery Well Head, Water Compound Analyzed Detection Limit in ppm (POL)# Concentration in ppm Benzene Toluene Ethylbenzene Xylenes 1,2~Dichloroethone (EDC) Ethylene Dibromide (EDB) Carbon Tetrochloride ¢ ¢¢¢2 ¢ ¢¢2 ¢ ¢¢2 ¢ ¢¢2 ¢ ¢¢¢2 ¢ ¢¢¢2 ¢ ¢¢¢2 ¢. ¢29 ¢.27 ¢.74 not ¢ound not ¢ound not ¢ound TOTAL PURGEABLE PETROLEUM HYDROCARBONS (GASOLINE) 1.6 BTX os o Percent of Fuel 65. Percent Surrogate Recovery *(Practical Ouantitatlon Limit) ~SD#6 ¢7/2¢/89 F¢8875f.wr1/1¢6 ~H/tz/ck/tl/mh Respect?ully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President ,AIR, WATER & HAZARDOUS WASTE LAmq~ATORY (No.151) CERTIFIED by CAL.--~RNIA DEPT of HEALTH SERVICES i ) / i , Central Coast Analytical Services ATTN: Pau! Andrews Delta Environmental 353¢ Data Drive Rancho Cordova, CA CentraZ Coast .Lab Number: F-g8876. Analytical Services, Inc. Collected: ~$129/89 141 Suburban Rood , Suite C-~ Received: ¢7/¢$/89 Son Luis Obispo, California 93~¢1 Tested: ¢7/¢6/89 (8¢5) 543-2555 Collected by: S. Talanki Fuel Fingerprint Analysis - EPA Method 826¢ EXTRACTED BY EPA METHOD 5¢5¢ (purge-and-trap) SAMPLE DESCRIPTION: Airstripper Effluent Before First Carbon Drum 9567¢ #~¢-87-526, 85Z-9, Water Compound Analyzed Detection Limit in ppm (POL)# Concentration in ppm Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethone (EDC) Ethylene Dibromide (EDB) ¢ ¢¢¢2 ¢ ¢¢2 0 ¢¢2 ¢ ¢¢2 0 ¢¢¢2 0 ¢¢¢2 not found not found not found not found not found not found TOTAL PURGEABLE PETROLEUN HYDROCARBONS ¢.1 (GASOLINE) <0.1 BTX os a Percent of Fuel Percent Surrogate Recovery not applicable 122. ======================================================================== *(Procticol Ouontitotlon Limit) MSD~6 F¢SB76f. wrl [1 ¢5 ~H/tz/jc/tl Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Hovlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LABORATORY (No.I~I) CERTIFIED by CALI~RNIA DEPT of HEALTH SERVICES '! ) Central Coast Analytical Services ATTN: Sudhakar Talank~ Delta Environmental 11~3E White Rock Rd. Suite 11~ Rancho Cordova, CA 9567~ Central Coast Lab Number: F-~8877 Analytical Services, Inc. CoIlected: ~6/29/89 1~1 Suburban Road , Suite C-~ Received: ~7/~3/89 San Luis Obispo, California 93~1 Tested: ~7/~8/89 (8~5) 5~3-2553 Collected by: S. Talanki Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~$~ (purge-and-trap) SAMPLE DESCR[PTZON: D~4~-87-~26, 83Z-9, Discharge Zn¢iltration Gallery aCter 2nd Carbon Drum, Water Compound Analyzed Detection Limit 'in ppm (POL)# Concentration in ppm Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethane (EDC) Ethylene Dibromide (EDB) Carbon Tetrachloride not found not found not found not found not found not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS (GASOLINE) BTX os o Percent of FueI not appllcabie Percent Surrogate Recovery 1¢3. *(Practical Ouantltatton Limit) MSD//6 F~8877~.~r1/1e6 MH/tz/ck/tl/mh Respectfully submitted, CENTRAL COAST ANALYTZCAL SERV/CES Mary Havlicek, Ph.D. President Centra! Coast Analytical Services Central Coast Analytica! Services 141 Suburban Road, Suite Son Luis Obispo, California (8~5) 543-2553 Lab Number: As Listed Collected: e6/29/89 Received: ~7/e3/89 Tested: As Listed Collected by: Sudhokor Talonki ATTN: Sudhakar Talanki Delta Environmental 1193g White Rock Road Suite 11~ Rancho Cordova, CA 9567~ REPORT LAB NUMBER SAMPLE DESCRIPTION Sample Description: 4~-87-326, 83z-g, Monitoring Water, Samples as Listed DIGESTED BY EPA METHOD 3~2~ ~7/~6/89 BY AEA ..-- LEVEL FOUND TOTAL LEAD mg/1 EPA METHOD DETECTION LIMIT(POL)*.*~ .... DATE/ANALYST ***STLC 7421 ¢.~¢5 ~7/17/89 AEA 5.~ F-8875 Air Strlpper Influent, ~.~16 Recovery Wellhead F-8877 Discharge Infiltration GoIiery, ~.21 After 2nd Carbon Drum **Proctlcoi Ouontltotlon Limit ***SOLUBLE THRESHOLD LIMIT CONCENTRATION os ilsted in 22 Cai Adm Code Article 11 Sec. 66699 os persistent and biooccumuIotlve toxic substance. "NO LIMIT" means not ilsted therein os persistent and biooccumulotlve toxic substance. F8875DL.WR1/#79 mH/l? Respectfu!ly submitted, CENTRAL COAST_ ANALYTICAL SERVTCES Mary Havlicek, Ph.D., President APPENDIX B System Start-up Data RECORDED RECOVERY ~L INFO~TION ~ P~INS ~-1 ~ F~W(G~ONS) D~ ~ WA~R(~) FROM PRO~ ~I~S(IN~ OR P~ ~I~S IN ~(IN~) P~DU~ CO~E~ IN T~(~A~ONS) AIR CO~SSOR T~ P~~ P~ P~ I~ ~(~ P~DU~ P~ OP~TION ~ ~ORINA~ RECOV~Y B~ CO~SSOR PUNP$ IHD EQUI~ RONITORIN(~ DAVIES OIL COMPINY DELTA PROJECT NO. 40-87-326 PASE I OF' 2 : ¢,~- R. OL.'/tO '30 20 J '. J lqo/soo : 3gq,'7oo 65~,ooO .blqofioo q Soz,,fl oo N~L N ~L N~L NIL Go-mo Psi : 6~ -m~ P~t : bo-mo Psi : 6o-To.es~ : 6o-~0 Psi WATER TREATHENT INFOP, I~TION WATER LEVEL IN TOWER SU~(7-10 INCH FLOW VALVE TRANSMITTER SETTING (INCHES) SUPPLY PRESSURE TO TRANSMITTER(5-15 PSI RAN6E~ SUPPLY PRESSURE TO AC'iTJATOR(60-90 PSI RAN6E) AIR VEL. (FI'/MIN) AIRSTRIPPER 6AUSE RFADING 2000~00 FT/NIN RANGE PRESSURE DROP ACROSS PACKING (GAUGE READIN6) O. 1-0.3 INCHES WATER RANGE WATER PRESSURE READING(BEFOI:{E FILTER) (Pst) WATER PRESSURE READING(AFtER FILTER) (PSI) CI-D. NGE WATER FILTER YES/NO ELECTRIC METER READING {KWH) COMMENTS PUI~PS XI~ E~IP~IE~ Dl~V I~S OIL DELTA PROJE~ NO. 40-~7-325 PA$£ 2 OF 2 ; 10 ' tc~ : Io ' !o ; : 0 : 0 : o ' 0 ' 0 : /-.2. : ~: 2 : ~-.._s : .~ & ' , ; -..- : ; ; '1. !- ! J I 1 J _1 1 I APPENDIX C Calculation Methodology for Hydrocarbon Emission Rates _.L--- I~u£?0£~' II fy/~-rH~o O Delta Environmental Consultants, Inc. 1801 Highway 8, Suite 114 St. Paul, MN 55112 812-836-2427 SUBJECT CHECKED BY DATE 'TO "i-OT,4~_ p-C.-n~oL_6~um H.,¥O~oc~_~o/xg CT?H') (_. 0 r¢C. ~ "r-~ p, 'F I O.~,_.q, . /¢Pcv'O L/q-~ 0~.~ ~,e y C o~c c=-- N:'rTe ,4 .¥ C Or, JVET~/O~J /oo'/ £/*~O~g ,-~ev 1'4 ~£L~t 7r lC,L~ ¢./'4/££/,2/,j /_.;/.? r E.' =- IV'liN Delta Environmental Consultants, Inc. 1801 Highway 8, Suite 114 St. Paul, MN 55112 612-636-2427 PROJECTNO, .,~-].O ~'7.~2~/ SHEET -~. OF ~--.- ~,-~ ~," £'~ '~ '"' PROJECT NAME BY ~ f~./.;r~.'~ ~-'I<"'-)A'2 /:1i/.... ' )"?' i,'"/"c.l~-L CHECKED BY DATE OVERHEAD ELECTRIC ~ 4 IN BURIED WATER DISCHARGE LINE TO POWER, SUPPLY ~'~ INFILTRATION GALLERY (2 FT BELOW GROUND) ~ '~ ELECTRIC CONTROL PANEL  ~*~AT ' FOR TREATMENT SYSTEM .~' / ~T"0RAGE-TANK~ ~ GRAVEL ./- co.c..~ L_L , ~ co.c.~TE .AD ~ · ~ , 1~'-~"1 EXTRA ~ FOR WATER _.-',-' Il ; ,.m.~-8 ~ I 1 · ~A.O .,~/- SHE !-____---w^~.~.= '" ""'. °'""'~" "'-~' .......... -: ,, . ' ' ' '." / ~LaES .-'~" LEA'<;H~' ~i / l---J II / /,-1 ~./// // ' ' ~ TRANSFER PUM i~~' ,.~'~-.-- ' X --'~b-~V~L- I~ I J f / I FLOW CONTROL ~ / · ./ ~ '~! _..L~ AU/UMAIIC LEVEL L;UflI/HULb I~IblUt:,WI:LL LACTIVATED CARR~N ' I - / // ~ VAPOR AND ~" PRODUCT STORAGE TANK ~ ' / // PROOUCT LILIES (250 GALLON CAPACITY) T ~C.AV. I. / . I./ LEGES. J r-q ,,r , Mw-11 _..a , .// / ~ /~ RW-1 RECOVERY WELL LOCATION ,: ,~ I// i i GRAVEL (~) MW-16 ® · P-~ MONITOFUNG VVELL LOCA~ PROPOSED MONITORING WELL LOCATION PIEZOldETER LEAK SITE SURVEYED MAY 2, Ig88 0 ,lOFT SCALE FIGURE 1 GENERAL LAYOUT OF WATER TREATMENT SYSTEM DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD, CA. 40-S7-326 SRT 8/11/89 .~, ~ OVERHEAD ELECTRIC POWER SUPPLY ~4 IN BURIED WATER DISCHARGE LINE TO INFILTRATION GALLERY (2 FT BELOW GROUND)  t ELECTRIC CONTROL PANEL y ~A~T~ FOR TREATMENT SYSTEM AT - GRAVEL CONC. PAD ! ~ CONCRETE PAD { , '-~"1 EXTRA ~ FOR WATER. MW-10 I IUNLEADED ~ TREATMENT SYSTEM ...-'-/ SHE,-.! I , '-- WATER TO AIR STRIPPER INLET p , ] i , ,, / .~< /'~1 ! ' I I'" ! IlC AIR STRIPPER / / \ /_il I ' I / / I ~---TRANSFER PU~ ,./' I IE.~ %- ~,' ~RW-, W^TERA.D.RO~,UCT~,~T./ / ~'.AR~CULATEF,.TE. I I ,.,,,~.,.=r-, /-~ ~i I J AUTOMATIC LEVEL CONTROLS INSIDE WELL [ACTIVATED r'AR~nJd FILTER~: I I / v~o. A.~ ~-.RO~UCt stORAge tA.~ ' ~c~v~ I./! .r I uw-~ ' //I ! ~ A RW-1 RECOVERY WELL LOCA~ GRAVEL MW-l: MW-2 ~ ~ MW-1 MONITORING WELL LOCAT1ON (~t MW-16 PROPOSED MONITORING WELL L~AT~ · P-1 ~TER L~ ~E ~VEY~ ~Y [ 0 4OFT SCALE FIGURE I 40-67-326 GENERAL LAYOUT OF WATER TREATMENT SYSTEM DAVIES OIL 3305 1/2 GULF STREET BAKERSFIELD. CA. AIR, WATER & HAZARDOUS WASTE LAE'-,~ORY (No.151) CERTIFIED by CALI ~IA DEP~ ,~ ~ © I~ UX.~/~lh~ Centr,1 C,ntr,~ Co, st Lob N.~.r. Co.st Analytical Se~ces, ~nc. Coll~ed:' ~6/29189~ Analytica~ 1~1 Suburban Road , Suite C-~ Received: Services San Luis Obispo, CaZ$~ornia 93~1 Tested: ~7/~8/89 (8~5) 5~3-2553 CoZZected by: S. TaZank$ FueZ F~ngerp~$nt AnaZys~s - EPA ~thod 826~ ATTN: Sudhakur Talank$ Delta Environmental 11~3~ White Rock Rd. Suite 11~. Rancho Cordova, CA g567~ EXTRACTED BY EPA HETHOD 5~$~ (purge-and-trap) SANPLE DESCRZPT/ON: D~4~-87-$26, 83Z-9, Atrstripper Zn~luent, Recovery Well Head, Water Compound Analyzed Detection Limit in ppm (POL)# Concentration in ppm Benzene ~.~2 ~.~29 Toluene ~.~2 ~.27 Ethylbenzene ~.~2 ~.1~ Xylenes ~.~2 ~.7~ 1,2-Dlchloroethone (EDC) ~.~2 not found Ethylene D/bromide (EDB) ~.~2 not found Corbon Tetrochlorlde ~.~2 not found TOTAL PURGEABLE PETROLEUN HYDROCARBONS ~.1 (GASOLINE) 1.6 BTX os o Percent of Fuel 65. Percent Surf.gore Recovery 1~. #(Proctlcol Ouontltatlon Limit) ~SDf6 E7/2~/89 F~8875~. ~rl/1 ~6 NH/tz/ck/tl/mh Respectfully submitted, CENTRAL COAST ANALYTZCAL SERVZCES Nary HavZicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LAF ~TORY (No.151) CERTIFIED by CALIF -~IA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: Mike Westerheim Delta Environmental 355~ Data Drive Rancho Cordova, CA 95674 Central Coast Lab Number: F-~gE27 Analytical Services, Inc. Collected: ~7/~6/89 1~1 Suburban Road , Suite C-~ Received: ~7/~7/89 San Luis ObiSpo, California 95~1 Tested: E7/12/89 (8E5) 5~3-2553 Collected by: S. Talanki Fuel Fingerprint Analysis - EPA Method 826~ EXTRACTED BY EPA METHOD 5~$~ (purge-and-trap) SAMPLE DESCRZPTZON: Davies 0il, Delta #~E-87-$26, Fed #85Z-9 Air Stripper Znf/uent RW-1 Wellhead, Water cOmpound Analyzed Detection Limit in ppm (pQL)# Concentration in ppm Benzene ~.~5 ~.~28 Toluene ' ~.~5 ~.29 Ethylbenzene ~.~5 ~.12 Xylenes ~.~5 ~.82 1,2-Dtchloroethone (EDC) ~.~5 not found EthyIene Dlbromlde (EDB) ~.~5 not found Carbon Tetrochlorlde ~.~5 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) 5.1 BTX os o Percent of Fuel 57. Percent Surrogate Recovery 122. *(Proctlcoi Quontttotton L/m/t) MSD~7 ~7-21-89 Fe9~27f.wr1/11 ~ I~l/jZ/jc/rh Respectfully submitted, CENTRAL COAST ANALYTZCAL SERVZCES M=ry Havltcek, Ph.D. President AIR, *WATER & HAZARDOUS WASTE LA' ~ATORY (No.151) CERTIFIED by CALI~ NIA DEPT of HEALTH SERVICES Central Coast AnalyticoZ Services ATTN: Mike Westerhetm Delta Environmental $$3~ Data Drive Rancho Cordova, CA 9567~ Central Coast 'Lab Number: Analytical Services, Znc. Collected: lkl Suburban Road , Suite C-~ Received: San Luts Obtspo, California 934~1 Tested: (8E5) 5~3-2553 Collected by: S. Tala~kt Fuel Fingerprint Analysts - EPA Method 826~ EXTRACTED BY EPA METHOD 5~3~ (purge-and-trap) SAMPLE DESCRZPTZON: Davies 0tl, Delta #~-87-325, Fed ~83Z-9 Air Stripper Zn?luent RW-1 Wellhead, Water Duplicate Analysis Compound Analyzed Benzene Toluene Ethylbenzene. Xylenes 1,2-DichLoroethone (EDC) Ethylene Olbromlde (EOB) Corbon Tetrochlorlde Detection Limit in ppm Concentration in ppm e.ee5 e.ee5 e.~2 ~.~5 ~.~97 ~.~5 e.67 ~.~5 not ~ound ~.~5 not ~ound ~.~5 not ~ound TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) :5.3 BTX os o Percent of Fuel 31. Percent Surrogote Recovery 94. w(Proctlcol Ouontitotlon Limit) ~SDf7 E7-21-89 F~9~27fd.~r1/11 ~ MH/jl/jc/rh Respectfully submitted, CE SERVZCES ~ry Havlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LAF )TORY (No.g~&131) CERTIFIED by O' ~FORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: C. Brandon Poteet Delta Environmental 3338 Data Drive Rancho Cordova, CA 95678 Central Coast Lab Number: F-89291 Analytical Services, Znc, Collected: 47/13/89 1~1 Suburban Road , Suite C-~ Received: ~7/1~/89 San Luis Obispo, California 95~81 Tested: 87/15/89 (885) 5~$-2553 Collected by: C.B. Poteet Fuel Fingerprint Analysis - EPA Method 8268 EXTRACTED BY EPA METHOD 5~$~ (purge-and-trap) SAMPLE DESCRIPTION: Davies Oil Co., Delta #~-87-236, Fed ~85Z-9, Airstrtpper lnfluent, Water Compound Analyzed Benzene Toluene Ethylbenzene Xyienes 1,2-Dlchloroethone (EDC) Ethylene DiDromlde (EDB) CorDon Tetrochlorlde Detection Limit in ppm (PQL)* Concentration tn ppm e.ee5 ~.37 ~.15 e.89 not found not found not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.5 (GASOLINE) 2.6 BTX as a Percent of Fuei 5~. Percent Surrogate Recovery 99. *(Practical Quant/tat/on Limit) MSD#7 47-26-89 F89291f.wr1/111 MH/~m/~c/rh Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LAF ~TORY (No.g~&131) CERTIFIED by C,.' ~fORNIA DEPT of HEALTH SERVICE:; Central Coast Analytical Services ATTN: C. Brandon Poteet Delta Environmental 3556 Data Drive Rancho Cordova, CA g5676 Centra! Coast Lab Number: F-69291dup Ana~ytical Services, Inc. Collected: 67/13/89 1~1 Suburban Road , Suite C-~ Received: 67/1~/89 San Luis Obispo, CaZifornia 95~61 Tested: 67/15/89 (865) 5~3-2553 Collected by: C.B. Poteet Fue~ Fingerprint Analysts - EPA l~ethod 8266 EXTRACTED BY EPA METHOD 5636 (purge.and-trep) SAI~PLE DESCRIPTION: Davies Oi! Co., Delta #~6-87-236, Fed #83Z-9, Airstripper In~uent, Water DupZicate Analysis Compound Analyzed Detection Li~it in ppm (PQL)# Concentration in ppm Benzene Toluene ~.6~2 6.52 Ethylbenzene ~.6~2 6.16 Xylenes ~.~62 6.89 1,2-Dtchloroethone (EDC) ~.~2 not found Ethylene Dlbromlde (EDB) 6.~2 not found Carbon Tetrochlorlde ~..6~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS 6.2 (GASOLINE) 2.5 BTX os a Percent of Fuel 5~. Percent Surrogate Recovery 111. *(Practical Ouantltatlon Limit) ~SD~7 g7-26-8g F69291fd.wr1/111 MH/tz/jc/rh Respect~'ully submitted, CENTRAL COAST ANALYTICAL SERVICES I~ry Havlicek, Ph.D. President AIR, WATER & HAZARDOUS WASTE LA TORY (No.151) CERTIFIED by CAL.' NIA DEPT Of HEALTH SERVICES CentraZ Coast AnaZytical Services ATTN: Paul Andre~s Delta Environmental $358 Data Drive Rancho Cordova, CA 95678 Central Coast Lab Number: F-88876 Analytical Services, Inc. Collected: 86/29/89 1~1 Suburban Road , Suite C-~ Received: 87/83/89 San Luts Ob/spa, California 93~81 Tested: 87/86/89 (885) 5~3-2553 Collected by: S. Talanki Fuel Fingerprint Analysts - EPA Method 8268 EXTRACTED BY EPA METHOD 5838 (purge~and-trap) SAMPLE DESCRIPTION: Airstrtpper Effluent Before F/rst Carbon Drum #~8-87-326, 83Z-9, Water Compound Analyzed Detect/on Limit in ppm (PGL)# Concentration in ppm Benzene .,. ToZuene Ethylbenzene Xylenes 1,2-Dlchloroethane (EDC) Ethylene Dibromide (EDB) not found not found not found not found not found not ~ound TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.1 (GASOLZNE) BTX as a Percent of Fuel not applicable Percent Surrogate Recovery 122. #(Practical Ouontitation Limit) ~SD~6 87/12/89 F88876f. wrl/183 Respectfully submitted, CENTRAL COAST ANALYTICAL SERVICES Mary Havltcek, Ph.D. Pres/dent AIR, WATER & HAZARDOUS WASTE LI ~ATORY (No.151) CERTIFIED by CAL' ~NIA DEPT of HEALTH SERVICES CentraZ Coast Ana~yt~ca~ Services ATTN: Mike Westerhetm DeZta Env~ronmentaZ $$3~ Data Dr~ve Rancho Cordova, CA 9567~ Contra[ Coast Lob Number: F-~9~28 AnaZytical Services, Inc. Co[lect< ': ~7/~6/89 141 Suburban Rood , Suite C-4 Received: ~7/~7/89 San Lugs Obtspo, CoZtforn~o 954~1 Tested: ~7/12/89 (8~5) 543-2555 ColZected by: S. Tolanki Fue! Fingerprint AnaZys~s - EPA Nethod 826~ EXTRACTED BY EPA METHOD 5~$~ (purge-and-trap) SAMPLE DESCRZPTZON: Davies 0~, DeZto #4~-87-$26, F~8~Z-9, Water A~r Stripper Effluent Be~ore 18t Carbon Dra~ Compound AnaZyzed Detection L~mit ~n ppm (pQL)# Concentrot/on ~n ppm Benzene .~ ~.~2 not found Toluene ~.~2 not found Ethyibenzene ~.~2 not found Xylenes ~.~2 not found 1,2-Dlchloroethone (EDC) ~.~2 not found Ethylene Dlbromide (EDB) ~.E~2 not found Corbon Tetrochloride ~.~2 not found TOTAL PURGEABLE PETROLEUN HYDROCARBONS ~.~5 (GASOLINE) <~.~5 BTX as a Percent of Fuel not applicable Percent Surrogate Recovery 97. *(Practica! Ouantltatlon Limit) ~SD~7 ~7-21-89 F~g~28f.wr1/11~ MH/jl/jc/rh Respectf'ully subm:Ltted, Mary Havlicek, Ph.D. President AIR, ~ATER & HAZARDOUS WASTE LA ~'~TORY (No.9~&I$1) CERTIFIED by ( "')FORNIA DEPT of HEALTH SERVICES Central Coast Analytical Services ATTN: C. Brandon Poteet Delta Environmental 333g Data Drive Rancho Cordova, CA 9567E Central Coast Lab Number: F-~9292 Analyttca! Services, Inc. Collected: ~7/13/89 lkl Suburban Road , Suite C-~ Received= ~7/lk/89 San Luis Obtspo, California 95~1 Temted: ~7/15/89 (8~5) 5k~-2555 Collected by: C.B. Poteet Fuel Fingerprint Analysts - EPA Method 826~ EXTRACTED BY EPA I~ETHOD 5E~ (purge-and-trap) SAI~tPLE DESCRIPTZON: Davies 0il Co., Delta #k~-87-256, Fed #85Z-9, A~rstripper Effluent, Water Compound Analyzed Benzene Toluene Ethylbenzene Xylenes 1,2-Olchloroethone (EDC) Ethylene Dlbromtde (EDB) Carbon Tetr~chlo~de Detect~on Limit tn ppm (pQL)~ Concentr. t~on Sn pp~ ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found ~.~2 not found TOTAL PURGEABLE PETROLEUM HYDROCARBONS ~.~5 (GASOLINE) <~.~5 BTX os o Percent of Fuel not applicable Percent Surrogate Recovery 1~7. #(Practical Quontltotlon Llm/t) ~SD~7 g7-26-89 F~g292f.wr1/111 ~H/jm/jc/rh Respectfully submitted, CENTRAL COAST ANALYTZCAL SERVZCES I~ry Havltcek, Ph.D. President. 1 I i ] I .I I ! 1 ! APPENDIX D Calculation Methodology for Estimation of Carbon Breakthrough REMEDIAL SYSTEM MONTI{r' Davies Oil Company 3305 1/2 Gulf Street Bakersfield, CA Delta Projec~ No. 40-87-326 Page 5 NG REPORT ./ 3.0 PROPOSED MONITORING PROGRAM After the first month of operation of the water treatment system, the following will constitute the monitoring program from August 1989 to August 1990. · Sampling and analyzing the air stripper influent on a monthly basis for dissolved hydrocarbons to calculate air emissions as required by the APCD. · Sampling the air stripper effluent on a quarterly basis for dissolved hydrocarbons, as required by MRP to document air stripper efficiency. Sampling the effluent (prior to infiltration gallery discharge) on a monthly basis for dissolved hydrocarbons as required by MRP to document discharge water quality. The discharge sample will be collected after the first of the two activated carbon filters in series to monitor for carbon breakthrough. The reason for sampling after the first carbon filter is the assumption that the first carbon filter will achieve breakthrough prior to the second carbon filter. The breakthrough for the first carbon filter is estimated on the order of 3 years. If the periodic inspection of air stripper packing, monthly sampling of air stripper influent for concentration fluctuations, and quarterly sampling after the first carbon filter indicate that carbon breakthrough has been achieved, the second carbon filter will act as a backup before water discharge to the infiltration gallery. After breakthrough is achieved in the first carbon filter, the spent carbon will be replaced by regenerated or flesh carbon. · Collecting pumping information from recovery well RW-1. · Collecting information on free product recovery from RW-1. Collecting water and product levels (if any) in the monitoring wells MW-2, MW-3, MW-4, MW-5, MW-8, MW-9, MW-10, MW-Il, MW-12, and piezometers P-1 and P-2 in the infiltration gallery for ground water flow and presentation of capture zone calculations for recovery well RW-1. Calculating hydrocarbon removal rates from water through the air stripper and carbon. The information will be used to quantify air emission rates and to estimate breakthrough point for carbon, respectively. · Reporting the information and progress to the Regional Board on a monthly basis. f__l . f'4 ~ T ~tOD, Delta Environmental Consultants, Inc. 1801 Highway 8, Suite 114 St. Paul, MN 55112 612-636-2427 V -To E S T-l h.1;ff 'r~ ~ le E~S Fl 1'9 th ~OR ORIGINAL = '_-iff Ft~SU~?T~O~V£ ; ~flr Delta Environmental Consultants, Inc. 1801 Highway 8, Suite 114 St. Paul, MN 55112 612-636-2427 PROJECT NO. /I PROJECT NAME, SHEET SUBJECT r~ ?¢ O~,/ CHECKED BY DATE .... -~-L~U'/D',4-L E'fVT' -f'~' U..SI/V~ 1~,3ooMr~ ,~P,A~ .)< L ~ 0'7 L.B C. OrJC/.-V.S IO/V .' 10~o o~YZ OF 14_ Tt-hcOO& H T/+E i~r- C A~Bo/V FI~ T~R. ~ ON T/rvOUJ OPE"~./~T-,O,q r-)CCC. ,4C'T /'4. c_. ~, L~,,4-CI< L,'¢ T-D t~E (.~E' I'VE'Y~ A TE-D ~A.R(~OM .' REMEDIAL SYSTEM MONI~ Davies Oil Company -3305 1/2 Gulf Street Bakersfield, CA Delta ProjeCt No. 40-87-326 Page 6 In addition, the semiannual sampling of all monitoring wells will be performed as required in the MRP, and reporting will be in accordance with the MRP. Table 3 shows the proposed sampling schedule for one year of operation of the water treatment system (till October 1990). The monitoring program will be evaluated and revised if necessary after the first year. TABLE 3 Proposed Sampling Schedule of Water Treatment System (1 year) Sampling Point/ Description Air Stripper InflUent Sampling Frequency Monthly Sampling Period August 1989 August 1990 to Analysis BTEX, TPH (Fuel Fingerprint) Air Stripper Influent Quarterly August 1989 to August 1990 Total Lead Air Stripper Influent Semiannual August 1989 to August 1990 EDB, EDC, Carbon tetrachloride Air Stripper Effluent Quarterly August 1989 to August 1990 BTEX, TPH, Total Lead Effluent (prior to infiltration discharge) Effluent (prior to infiltration discharge) Monitoring Wells Monthly August 1989 to BTEX, TPH August 1990 Quarterly August 1989 to Total Lead August 1990 Semiannual September 1989 and March 1990 BTEX, EDB, EDC, Carbon tetrachloride, TPH, Total 'Lead 4.0 GRADIENT CONTROL 4.1 Theoretical Capture Zone for Recovery Well RW.1 Recovery well RW-1 has been pumping at 30 gpm since the system start-up on June 29, 1989. Figure 3 shows the theoretical zone of capture for the well. The theoretical downgradient stagnation point extends 195 feet from RW-1. The width of capture at the well is 307 feet. The assumptions and calculation methodology are included in Appendix E. LI UID PHASE ADSORPTION ISOTHERMS · . ! i RF.~IDUAL CONCENTRATION Ct lmg. fll APPENDIX E Theoretical Capture Zone for Recovery Well RW-1 Delta Environmental PROJECT NAME ./~)~d//,'~ / ~.~ ~'~-/~ ,. Consultants, Inc. e~ ~~ DATE 11 ~0 White R~k, Suite 110 , Rancho Cordova, CA 95670 SU~ECT ~P~ ~ ~'~ /~ ~ "3~ 91~2085 CHECKED BY. DATE · .. .....- ..... .;.?.....-. -.,- · . .. .. ..~ lOe+l ........ 18e-1, 10e+8 UA'IA SET LI~IN6 RW-1 I) = 50 gpo r c 0.50 feet No."" Tim~ ~)r&vdov. No. Time ~mvdoun (tins) (ft) (tins) (ft)- I 0,~ 2.10 7 4,~ ' 3.~ · cOMpUTER ANALYSIS BY: ILLINOIS STATE,WATER SURVEY SOFTWARE - AQUIFER TEST CONDUCTED MAY 3, 1988 ~TII~TED ~fl)RO6EOL06IC lrinnmissivity (T) t 11000 gpdlft Storage ~fficiL'nt [$) - B. GE-02 Environmental Consultants, Inc. RW-1 THEIS ANALYSIS CURVE 3305 1/2 GULF STREET BAKERSFIELD, CA. DRAWN BY ~,.'.~ JOB NO. 40-87-326 CHK BY:/~j~" 3 RW-1 50 gpo r = 0.50 feet No. Tiao Drivdovfl (Lies) (ft) 7 · 4,~8 3.25 B &.20 3,27 ~ 13.03 3.40 10 28.48 4.02 11 $1.55 4.54 No. Tiff CLins) (ft) I '0,78 2.10 2 · 1.15 2.55 3 ' I.U 4 2,15 $ 2.85 3.11 3.53 3.18 indicates the-data point vas excluded froo .regrusion calculations TTTRATIDN SUlW~Y It~r sin. t used tLin T S 1 0.78 0.348 1182S ILC61U~SSlON SUIgtAI~Y' 1.11~ fc~t/cycle Y-intwcept Cb) · 2.4~ fNt Correlatio. Coefficient (1~) c 0.9695 I~'TINATED HYDRO~IC PARAH~ TranS~issivity CT) - 12000 gpdlft Storape Coefficient (S) Slope .. NOTE:....' ~ ........................ COMPUTER ANALYSIS BY:' ILLINOIS STATE WATER SURVEY SOFTWARE AQUIFER TEST CONDUCTED MAY 3, 1988 ADelta Environmental Consultants, Inc. RW-1 JACOB ANALYSIS DATA 3305 1/2 GULF STREET BAKERSFIELD, CA. JOB NO. 40-87-326 I CHK BY./~,~p~ /~ APPENDIX F Simulation Results of Pumping Recovery Well and Infiltration Discharge Ioo~?~ ~A-.S El> ON A- I"A/?t)T F,o~ I"lOOeL ; ~: I OO&em ~oe e~-tJ__ .j 5 (;0 t,J 600 570 540 510 4.80 420 ~90 ~60 330 300 270 240 210 180 150 120 ~0 ~0 30 $? 0 ~-/0~ 80~ Project Status Report Soil and Groundwater Remediation Davies Oil 3305 1/2 Gulf Street Bakersfield, California Presented To: Bill Davies Davies Oil and Ms. Dolores Gough Kern County Environmental Health Services Department Presented By: AquaGeosciences, Inc. November, 1'995 Jonathan.A. Bahr Project Engineer Philip Goalwin, R.G. #4779 Principal Hydrogeologist Registration Expires 11/30/96 1.0 2.0 3.0 4.0 5.0 6.0 TABLE OF CONTENTS INTRODUCTION REVIEW OF SITE HYDROGEOLOGY AND GROUNDWATER QUALITY DATA OPERATION AND MAINTENANCE (O & M) OF THE VAPOR EXTRACTION AND AIR SPARGE SYSTEM CONCLUSIONS RECOMMENDATIONS LIMITATIONS Paae 2 2 3 6 6 7 EXHIBITS Exhibit 1 Exhibit 2 Exhibit 3 Exhibit 4 Exhibit 5 Exhibit 6 TABLES Table 1 Vicinity Map Plot Plan Map Status of Soil and Groundwater remediation- Approximate Volume of Gasoline Removed (gallons) Average Daily LEL (%) Throughput Average Monthly LEL (%) Throughput Cumulative Monthly Volume of Gasoline Extracted Summarizes monthly/cumulative volume of gasoline extracted and assumptions/formula used for the calculation of the amount/volume of gasoline extracted 1.0 INTRODUCTION This report documents the progress of soil and groundwater remediation operations pedormed to date by AquaGeosciences, Inc. (AGI) at the Davies Oil Company facility located at 3305 1/2 Gulf Street, Bakersfield, California (Exhibit 1). AGI submits this report as per your request and provides the basis for AGI's recommendations for advancing confirmation borings and eventual site closUre. Two areas are addressed in assessing the progress of soil and groundwater remediation. The first is the level of remaining groundwater contamination and the second is the level of remaining vadose zone contamination. This assessment of the quantity of remaining hydrocarbons in soil and groundwater can be accomplished by: examining site hydrogeology represented by historical groundWater level elevations; reported contaminant concentrations in groundwater samples collected during past monitoring events; and o data generated during the operation, of the Vapor Extraction/Air Sparge system. Please refer to AGI's "Se.Dtember 1995 Groundwater Quarterly Monitoring Re.port" for a complete review of site hydrogeology and groundwater quality data. Advancing confirmation borings and subsequent site closure are recommended based on data generated from approximately twenty-five (25) groundwater monitoring events, from July '86 through September '95; data generated from continuous chart recording/monitoring of the Vapor Extraction and Air Sparge system (VES/AS) operating parameters; sampling and analytical testing of influent and effluent vapor streams; and data generated from periodic site visits and regular system maintenance (AGI's Field Log). 2.0 REVIEW OF SITE HYDROGEOLOGY AND GROUNDWATER QUALITY DATA There are a total of seventeen (17) groundwater Monitoring Wells and two (2) groundwater recovery wells located on and adjacent to the subject site (Exhibit 2). The site is located within a region of groundwater mounding. The mounding is presumably a result of groundwater recharge from large surface holding ponds in association with a water purification plant, located approximately 1/4 mile to the northeast. The regional groundwater gradient beneath the site is to the 2 southwest. Depth to groundwater remained between 14 to 19 feet below ground surface (bgs) from July 1986 to March 1989. In subsequent years the depth to groundwater progressively increased, resulting in the drying of several monitoring wells. In September, 1992 the average depth to groundwater at the site was approximately 35 feet (bgs). Groundwater measurements collected on August 15 and 16, 1995 show the depth to groundwater has an average depth of about 18.23 feet (bgs), a rise of approximately 2.7 feet in groundwater elevation from June, 1995. The rise in groundwater elevation allowed groundwater monitoring wells to be sampled that previously had been unavailable and provided for a more substantial water column in other groundwater monitoring wells. The increase in water column available for 'sampling allowed for a'more accurate "profile" of the aquifer underneath the site. The rise in groundwater elevation also placed groundwater in contact with a larger volume of the previously impacted soil in the capillary fringe; and increased concentrations of dissolved petroleum hydrocarbons would have been detected in the monitoring wells sampled. Concentrations of dissolved petroleum hydrocarbon in the groundwater decreased to non-detected in all groundwater monitoring wells sampled with the exception of MW-2 (TPHg 107 ppb, Total Xylenes 23 ppb). The concentrations detected in MW-2 are below MCL for xylenes (MCL = 1750 ppb) and indicate a significant decrease in concentrations from previous sampling events. 3.0 O & M OF THE VAPOR EXTRACTION AND AIR SPARGE SYSTEM Operation of the Firecat 250 CFM Thermal Oxidizer began on August 4, 1994. AGI monitored the Vapor Extraction System (VES), Air Sparging System (AS), and associated equipment in accordance with the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD). Furthermore, AGI performed additional monitoring to ensure understanding of the progress of this site's soil and groundwater remediation. These activities include: Pedodic measurements of influent and effluent vapor streams for VOC's,'with a PID or an FID instrument; and weekly routine maintenance, gauge and instrument readings, and equipment checks. These periodic and on-going activities allowed AGI to monitor the system completely and efficiently. Operation of this equipment continues to present date. 3 The following provides a summary of the operation of the VES/AS system: AGI began operation of this system on August 4, 1994. AGI continues to operate this system to the present time. Continuous chart recording of this system operating parameters made it possible to efficiently monitor and accurately assess the progress of soil and groundwater remediation. Four graphical representations of this system's operation parameters, derived from the continuous chart recording, are included as follows: Summary of Soil and Groundwater remediation (Exhibit 3), Average Daily LEL Throughput (Exhibit 4), Average Monthly LEL Throughput (Exhibit 5), and Cumulative Monthly Volume of Extracted Gasoline (Exhibit 6). Influent vapor concentrations measured as high as 60% of the LEL at startup and above 30% of the LEL dudng the first few weeks of operation (Exhibits 4 & 5). Influent vapor concentrations stabilized to below 20% of the LEL (Exhibits 4 & 5) by mid December 1994. On December 16, 1994, AGI incorporated a catalytic converter in the Thermal Oxidizer Through October 11, 1995, this remediation system has operated for 'over 433 days with approximately 11 days of equipment downtime due to breakdown or shutdown for regular maintenance. This translates into about 97.5 % of continuous site remediation during the period between August 4, 1994, and October 11, 1995. To date, approximately 8,272 gallons of gasoline has been extracted from soil and groundwater (Exhibit 3) and destroyed by the Thermal Oxidizer, an average of approximately 19.1 gallons/day. A graphical representation of the cumulative monthly volume of gasoline extracted is shown in Exhibit 6. For a detailed review of both formula and assumptions used in the calculation of the amount/volume of gasoline extracted per unit time, please refer to Table 1. · 4 TABLE 1 Calculation of amount/volume of gasoline remoVed(qallolrls/month): ---- CONCENTRATION(ppmv) X 1 0.6 (ppmv) X INFLUENT FLOW RATE(SCFM) / MOLAR VOLUME OF GAS(Ib-mole/ft3) X MOLECULAR WEIGHT OF GASOLINE(lb/lb-mole) X1440 MIN./day X 1 gallon/6.3 lb X RUN DAYS/ MONTH Conversion Factors: 1 gallon (gasoline) = 6.3 lbs (gasoline) Molecular Weight (gasoline) = 86 lb/lb-mole Molar Volume of Gas = 379.5 cubic foot/1 lb-mole 1 DAY = 1440 min. Month Aug-94 Sep-94 0ct-94 Nov-94 Dec-94 Jan-95 Feb-95 Mar-95 Apr-95 Ma},-95 Jun-95 Jul-95 Audi-95 Sep-95 0ct-95 Average LEL (%) 36 20 18 18 15 13 8 5 4 5 6 3 4 3 2 Average Flow SCFM 250 255 250 255 231 235 242 249 250 250 250 250 250 217 250 Column (1) (3) (4) IITotal as of October 1 I Key Run Da~s Days 28 30 31 30 31 31 28 31 30 31 30 31 31 30 11 Gasoline Removed Gallons/month 1778 1117 1013 961 741 704 402 250 214 277 234 166 222 154 39 1r .995 = 8272 Gasoline Removed Gallons (5) 0 1778 2895 3909 4869 5610 6314 6716 6965 7180 7457 7691 7857 8079 8232 System Startup on August 4~ 199Zl 1 °/6 LEL = 138 ppmv ( Concentration of influent vapor stream) Infiuent Flow Rate (SCFM) Gasoline Removed (gallons/month)- Please refer to Formula Above Cumulative Monthl~ Volume of Gasoline Extracted (gallonsI 5 4.0 CONCLUSIONS Based on data generated by AGI during this site's remediation activities, the current analytical data, and the existing site hydr°geological conditions (groundwater elevations at or near the highest levels recorded since 1987, groundwater in contact with the highest volume of previously impacted capillary fringe, and groundwater flow direction and gradient remaining relatively constant over the monitoring periods), AGI's conclusions are: .Remediation at the Davies Oil site has successfully removed all significant dissolved petroleum hydrocarbons from the shallow groundwater aquifer beneath the subject site. The rise in groundwater elevation allowed groundwater monitoring wells, that previously had been unavailable due to shallowness, to be sampled; and provided for a more substantial water column in other groundwater monitoring wells. The increase in water column available for sampling allowed for a more accurate site-wide depiction of aquifer profile. Additionally it allowed for groundwater samples to be more indicative of aquifer conditions with respect to remaining dissolved hydrocarbon plume. The rise in groundwater elevation also placed groundwater in contact with a larger volume of the previously impacted sOil in the capillary fringe, and as a result, increased concentrations of dissolved petroleum hydrocarbons would have been detected in the monitoring wells sampled. With regard to any potential remaining vadose zone contamination,lnfluent concentrations have been gradually decreasing from a high, at start-up, of 60% LEL to approximately 2% LEL at present, it is AGI's conclusion that with no dissolved Petroleum hydrocarbons being detected in the shallow groundwater aquifer, it is assumed that their contribution to the influent vapor stream is insignificant. Therefore, AGI, based on observations of influent vapor stream concentrations, and the fact that groundwater in contact with the capillary fringe did not exhibit increased concentrations, concludes that concentrations in the vadose zone are very Iow and may not be removed by further vapor extraction. 5.0 RECOMMENDATIONS Based On what is presented in this report, AGI recommends the following: · Discontinue groundwater air~ sparge operations; 6 Discontinue operation of the vapor extraction system; Continue quarterly groundwater monitoring for a period of one year; Submit a workplan for confirmation borings; and Recommend site closure after confirmation borings are advanced, chemical analyses of soil and groundwater samples are completed, and one year of groundwater monitoring indicates concentrations in the vadose zone are at or below 100 times the MCL's and groundwater is at or below MCL's. 6.0 LIMITATIONS AGI performed this investigation in accordance with generally accepted standards of care which exist in Central California at this time. It should be recognized that definition and evaluation of geologic conditions is a difficult and inexact science. Judgments leading, to conclusions and recommendations are generally made with limited knowledge of subsurface conditions present. No warranty, expressed or implied, is made. 7 Groundwater Scientists ° Environmental Consultants Se0tem~er 1995 Groundwater Quarterly MOnitoring Report Davies Oil 3305 1/2 Gulf Street Bakersfield, California Presented To: Bill Davies Davies Oil and Ms. Dolores Gough Kern County Environmental Health Services Department Presented By: AquaGeosciences, Inc. September, 1995 Patrick McCullough Project Geologist Philip Goalwin, R.G. #4779 Principal Hydrogeologist Registration Expires 11/30/96 4440 Grissom Street, Suite 100 ' Bakersfield, California 93313 (805) 836-8100 · FAX(805) 836-8800 (800) 3014244 TABLE OF CONTENTS SECTIONS 1.0 2.0 2.1 2.2 3.0 4.0 4.1 4.2 4.3 4.4 5.0 6.0 7.0 8.0 INTRODUCTION BACKGROUND Facility Description Project History GEOLOGY AND HYDROGEOLOGY GROUNDWATER MONITORING Groundwater Elevation Groundwater Monitoring Well Purging Groundwater Sample Collection Analytical Results ANALYTICAL RESULTS CONCLUSIONS RECOMMENDATIONS LIMITATIONS Page 2 2 2 2 4 5 5 5 6 6 8 8 9 10 Exhibit 1 Exhibit 2 Exhibit 3 Exhibit 4 Exhibit 5 Exhibit 6 Vicinity Map Plot Plan Map June 1995 Groundwater Gradient Map September 1995 Groundwater Gradient Map June 1995 Groundwater-TPHg Concentration Contour Map September 1995 Groundwater-TPHg Concentration Contour Map TABLES September 1995 Groundwater Monitoring - Liquid Level and Analytical Data Historical Groundwater Monitoring - Liquid Level Data Historical Groundwater Monitoring - Analytical Data Appendix A Groundwater Purge Data Sheets Appendix B Chain of Custody and Analytical Results 1.0 INTRODUCTION This report presents the results of the September, 1995 Quarterly Groundwater Monitoring performed by AquaGeosciences, Inc. (AGI) at the Davies Oil Company at 3305 1/2 Gulf Street, Bakersfield, California. On August 15 and 16, 1995, depth to water measurements were collected from wells on and around the site. The wells were then purged and sampled for chemical analyses. 2.0 BACKGROUND The following includes a facility description and a sequential project history to date. 2.1 Facility Descriotion Davies Oil is located at 3305 1/2 Gulf Street in the City of Bakersfield, Kern County, California (Exhibit 1). The site is currently operated as a gasoline and diesel dispensing service station and contains two gasoline and four diesel dispenser islands, along with an office complex. The site is surrounded by commercial operations and residential property. The facility is shown to scale on Exhibit 2. 2.2 Project History During the winter of 1985, inventory records first detected product losses from the regular-gasoline dispensing system. In response to these losses, a pressure test was conducted on the tank and lines which indicated a leak in the regular-gasoline product lines. The suspect faulty line was repaired, but shortly thereafter, inventory records again indicated product losses. The tanks and lines were tested again on March 3, 1986 where a leak in the vapor lines was detected then subsequently repaired. On July 1987, Twin Cities Testing Corporation estimated 2,500 gallons of regular-gasoline may have been lost on site. Shortly thereafter, Davies Oil contacted KCEHSD and apprised them of the situation. In October 1986, three (3) 10,000 gallon underground storage tanks were removed from the Davies facility because they were no longer in use. According to the KCEHSD, diesel fuel was detected in soil samples obtained dudng the excavation. Information generated by several prior consultants including Delta Environmental Consultants, Inc., Aegis Environmental, Inc., and Associated Soil Analysis, Inc. revealed the presence of both soil and groundwater contamination by gasoline range hydrocarbons at the subject site. A total of seventeen (17) groundwater monitoring wells, (nine (9) two inch and eight (8) four inch diameter) have been installed on and off-site. Additionally, there are two groundwater recovery wells, one 12-inch and one 6- inch diameter, designated as RW-1 and MW-12a. A groundwater treatment system was installed that consisted of a packed column air stripper for dissolved phase hydrocarbon removal and two carbon filters in line at the effluent port prior to 2 discharge to an on-site infiltration gallery. During installation and operation of the treatment system in 1988 and 1989, the water table was relatively stable between 18 and 22 feet below ground surface (bgs). In February of 1990, the water table dropped below the bottom of the groundwater recovery well at 36 feet bgs due to regional drought conditions, rendering the remediation equipment temporarily inoperative. In November of 1988, hydraulic conductivity tests were performed by Delta Environmental Consultants, Inc. This test was performed on RW-1 using a short duration pump test. Transmissivity was estimated to be 12,000 gpd/ft and hydraulic conductivity was calculated at 70 ft/day. A maximum plume extent was then calculated and was estimated at 1100 ft down gradient and was later confirmed by down gradient monitoring wells MW-13 and MW-14a. A soil vapor survey was conducted in November 1990 to establish the limits of hydrocarbon vapors in the soil. In January 1991, three (3) 4-inch diameter monitoring wells were installed down gradient of the plume (MW-13, MW-14, and MW-15) and one 4-inch well upgradient (MWo16) at the northern boundary of the property. Well depths ranged from 48.5 feet to 55.0 feet bgs. Groundwater analyses revealed benzene contamination above State Action Levels (SAL) in down gradient wells MW-13, MW-14, and MW-15. Upgradient well MW-16 showed non-detect (ND) results for all analyses. MW-14 however, exhibited the highest levels of dissolved hydrocarbons due to its central position down gradient of the gasoline plume. All four groundwater monitoring wells became dry in April 1991 due to a continuing decline of the water table. The deepest well was MW-13, completed to a depth of 55 feet bgs. In March 1992, four of the groundwater monitoring wells were twinned with deeper wells screened from 30 to 60 feet bgs to accommodate the declining water table. The new wells were designated MW-la, MW-11a, MW-12a, and MW-14a. All wells were completed with 4-inch Schedule 40 PVC casing and liner, except for MW-12a, which was completed with 6-inch diameter PVC casing. A pump test was conducted on MW- 12A before plumbing it to the air stripper tower on-site. The groundwater remediation unit was apparently re-started in fall 1992, but due to Iow flow rates, high drawdown, and a continuing decline in the water table, was shut down once again a few months later near the end of 1992. The project was apparently idle from 12/92 to 9/93. In September 1993, AGI was retained by Federated Insurance to begin quarterly groundwater monitoring, develop and implement a Remedial Action Plan. On April 4, 1994 the KCEHSD approved the Remedial Action Plan submitted by AGI. An addendum to the Remedial Action Plan was then submitted in late April, 1994 which included air sparging of the groundwater which was later approved by the KCEHSD on June 10, 1994. On July 7, 1994, AGI installed ten (10) air sparge wells along the southwest portion of the Davies Facility. On July 11, 1994 through August 4, 1994, AGI began trenching, man/folding, and plumbing the air sparge wells and the existing vapor extraction wells 3 to a Vapor Extraction System. The Fire Cat 250 CFM Thermal Oxidizer was installed and operation of the Air Sparge and VES unit began on August 4, 1994. Operation of this equipment continues to present date. 3.0 GEOLOGYAND HYDROGEOLOGY 3.1 Site Geology The sediments underlying the site are Quaternary alluvial and fluvial deposits consisting of unconsolidated fine- to coarse-grained sands and sandy silts (Calif. Div. of Mines and Geol., 196~. The soil in the subsurface encountered from previous work consists of well graded to poorly graded sands and gravels to a depth of approximately 65 feet below the surface grade (bsg). 3.2 Site Hydrogeology Published data (KCWA, 199d) shows the site is located within a region of groundwater mounding. The mounding is presumably a result of groundwater recharge from large surface holding ponds in association with a water purification plant, located approximately 1/4 mile to the northeast. The regional groundwater gradient beneath the site is to the southwest. Previous work at the site indicated the depth to groundwater remained between 14 to 19 feet (bsg) from July 1986 to March 1989. In subsequent years the depth to groundwater progressively increased, resulting in the drying of several monitoring wells. The continuous drop in groundwater level is believed, in part, the consequence of the prolonged regional drought conditions which existed throughout central and southern California from about 1986 to 1992. In September, 1992 the average depth to groundwater at the site was approximately 35 feet (bsg). In September, 1995, AGI personnel collected groundwater measurements at the site from the existing monitoring wells and the results are shown in Table 2. Groundwater measurements collected on August 15 and 16, 1995 show the depth to groundwater has an average depth of about 18.23 feet (bsg), a rise of approximately 2.7 feet in groundwater elevation from June, 1995. Groundwater gradient in June, 1995 was 0.024 feet/foot, (Exhibit 3), and groundwater data in September, 1995 (Exhibit 4), shows a gradient of approximately 0.007 feet/foot in an overall southwesterly direction. The extended area of minimum slope in the center of the site is indicative of the air sparge system casuing a localized mounding of the groundwater surface in the southwest portion of the Davies oil site. California Division of Mines and Geology, 1964, Geologic Map of California, Bakersfield Sheet Kern County Water Agency, 1990, Improvement Distdct No. 4, 1989-Report on Water Conditions 4 4.0 GROUNDWATER MONITORING The following sections detail the methods and procedures used in conducting the field work on August 15 and 16, 1995. The field work included measuring groundwater levels, purging wells, and collecting groundwater samples. The purpose of the monitoring was to assess the groundwater gradient, and the concentration, distribution, and type of petroleum constituents in groundwater. Additionally, the purpose of the monitoring was to assess the effectiveness of the on-going remediation as well as determine time required before requesting site closure. 4.1 Groundwater Elevation Groundwater elevation data was collected from Monitoring Wells MW-l, MW-la, MW- 2, MW-3, MW-4, MW-5, MW-8, MW-10, MW-11, MW-11a, MW-12, MW-12a, MW-13, MW-14a, MW-15, and MW-16. Monitoring well MW-9 was not located. Monitoring well RW-1 was not sampled due to lack of accessibility. In those wells sampled, the depth of freestanding groundwater was measured to the nearest one hundredth (0.01) of a foot using a $olinst water level indicator. The Solinst water level indicator and attached measuring tape were washed in TSP and rinsed prior to each use. The well elevations were surveyed by Delta Environmental Consultants, Inc. All elevations were referenced to a bench mark located near the fenced corner at the northeast end of Gulf Street. The bench mark consists of a white wood post with an elevation of 409.50 feet above mean sea level. Measurements and reference elevations were taken from the north top edge of the well casing. 4.2 Groundwater Monitoring Well Purging Three (3) well casing volumes were removed from each well using a submersible purge pump or a bailer, depending on the well, prior to collecting a water sample. The volume of water to be removed was calculated by subtracting the depth to groundwater from the total depth of the well and multiplying by the cross sectional area of the well casing. Water temperature, pH, and conductivity were measured after the removal of each well volume. When the measurements were within 10% of previous measurements, the well was considered stabilized for sampling. The purge data sheets documenting the field results are included as Appendix A. 4.3 Groundwater Sample Collection Groundwater from each monitoring well was sampled for laboratory analyses following the purging of the well. Groundwater samples were collected by lowering a disposable PVC bailer into each monitoring well. Two (2) 40-milliliter amber VOA vials were filled with the collected groundwater sample and sealed with teflon-lined lids. Care was taken to ensure no headspace or air remained trapped within the vial when sealed. The water samples were immediately placed in an iced cooler at 4° 5 centigrade for storage and transport. The samples were logged on a chain of custody document, and transported to Halcyon, a California certified laboratory for chemical analyses. 4.4 Analytical Results Fifteen (15) groundwater samples were analyzed by Halcyon Laboratories of Bakersfield, a State certified laboratory, in accordance with State guidelines and EPA protocols. The groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX) using DHS Luff MethOd/8015M and EPA Method 8020, respectively. The laboratory reports and chain of custody documents for these samples are included in Appendix B. Table 1 below summarizes the laboratory results. Please Note: only fourteen (14) analytical results are detailed in Table 1. The fifteenth sample was a duplicate collected from monitoring well MW-2 and was designated MW-20. TABLE 1 SUMMARY OF LABORATORY ANALYSES OF GROUNDWATER SAMPLES FROM QUARTERLY MONITORING 8.15.95-8.16.95 M W - 1 19.35 ND ND ND ND ND NA M W - 1 A 17.66 ND ND ND ND ND NA MW-2 18.41 ND ND ND 23 1 07* NA M W - 3 19.26 ND ND ND ND ND NA M W - 4 19.02 ND ND ND ND ND NA M W - 5 16.49 ND ND ND ND ND NA M W - 8 19.46 ND ND ND ND ND NA M W - 1 0 17.40 ND ND ND ND ND NA M W - 11 18,22 ND ND ND ND ND NA M W- 11 A 1 7.50 ND ND ND ND ND INA M W- 12 A 17,61 ND ND ND ND ND NA M W - 1 3 19.46 ND ND ND ND ND NA MW-14A 18.86 ND ND ND ND ND NA M W- 1 5 18.92 ND ND ND ND ND NA M W- 1 6 15.84 ND ND ND ND ND NA Results reported in ug/L (ppb) TPHg = Total Petroleum Hydrocarbons as gasoline TPHd = Total Petroleum Hydrocarbons as diesel ND = Non-Detect NA=Not Analyzed *Note: MW-2 and MW-20 are duplicate samples. The results presented in this table are those from MW-20. 7 5.0 ANALYTICAL RESULTS; Exhibits 5 and 6 graphically show AGI's interpretation of the changing aerial distribution and concentration of TPHg, in parts per billion, from June, 1995 to September, 1995. Monitoring well MW-2 contained detectable concentrations of TPHg. Concentrations for TPHg range from non-detected to 107 ppb. Benzene concentrations were reported as non-detected as in all samples. 6.0 CON(~LUSION$ There are a total of seventeen (17) groundwater Monitoring Wells and two (2) groundwater recovery wells located on and adjacent to the subject site. The initial ten (10) wells (MW-l, MW-2, MW-3, MWo4, MW-5, MW-8, MW-9, MW-10, MW-11, and MW- 12) were advanced to total depths of between twenty five (25) and thirty (30) feet below ground surface. Sedimentation and silt accumulation had previously caused MW-4, MW-5, and MW-8 to become dry; however, during this monitoring event, groundwater samples were collected. RW-1 is currently inaccessible to depth to groundwater measurement, and MW-9 cannot be located. MW-14 was not investigated because history has shown this shallow well to be dry and MW-14a is close to it for sampling. Depth to groundwater measurements and analytical data for MW-l, MW-la, MW-2, MW-3, MW-4, MW-5, MW-8, MW-10, MWo11, MW-11a, MW-12, MW-13, MW- 14a, MW-15, and MW-16 are shown on exhibits 4 and 6. Groundwater elevations have uniformly dsen approximately 2 feet across the site since the June, 1995 monitoring event. The rise in groundwater elevation allowed groundwater monitoring wells to be sampled that previously had been unavailable (MW-4 and MW-8) and provided for a more substantial water column in groundwater monitoring wells MW-l, MW-2, MW-3, MW-5, MW-10, MW-l l, and MW-12, respectively. 'The increase in water column available for sampling allowed for a more accurate "picture" of the aquifer and samples were more indicative of the aquifer conditions with less influence from the individual well bores (ie... wicking effects and sediment accumulation in the well casing). The rise in groundwater elevation also placed groundwater in contact with a larger volume of the previously impacted soil in the capillary fringe, then increased concentrations of dissolved petroleum hydrocarbons would have been detected in the monitoring wells sampled. Concentrations of dissolved petroleum hydrocarbon in the groundwater decreased to non-detected in all groundwater monitoring wells sampled with the exception of MW-2 (TPHg 107 ppb, Total Xylenes 23 ppb). The concentrations detected in MW-2 are below MCL for xylenes (MCL = 1750 ppb) and indicate a significant decrease in concentrations from previous sampling events. 8 In light of the current analytical data, and the existing site conditions (groundwater elevations at or near the highest levels recorded since 1987, groundwater in contact with the highest volume of previously impacted capillary fringe, and groundwater flow direction and gradient remaining relatively constant over the monitoring periods), it is AGI's conclusion that remediation, at the Davies Oil site, has successfully removed all significant dissolved petroleum hydrocarbons from the shallow groundwater aquifer beneath the subject site. With regard to any potential remaining vadose zone contamination, AGI monitors influent concentration to the thermal oxidizer on a daily basis. Influent concentrations have been gradually decreasing from a high, at start-up, of 60% LEL to approximately 2% LEL at present. Although AGI has not operated the oxidizer without the groundwater air sparge system also operating, it is AGI's opinion that with no dissolved petroleum hydrocarbons being detected in the shallow groundwater aquifer, it is assumed that their contribution to the influent vapor stream is insignificant. Therefore, AGI, based on observations of influent vapor stream concentrations, and the fact that groundwater in contact with the capillary fringe did not exhibit increased concentr:ations, concludes that concentrations in the vadose zone are very Iow and may not be removed by further vapor extraction. 7.0 RECOMMENDATIONS Based on the analytical results presented herein, AGI recommends the following: Discontinue groundwater air sparge operations; Continue operation of the vapor extraction system on a cyclic basis; (on one week, off one week) Continue quarterly groundwater monitoring for a period of one year; Submit a workplan for confirmation borings when after cyclic operation of the vapor extraction yields influent concentrations of 1% of the LEL or less; Requesting closure after confirmation borings are advanced and one year of groundwater monitoring indicates concentrations in the vadose zone are at or below 100 times the MClJs and groundwater is at or below MCUs. 9 8.0 LIMITATIONS AGI performed this investigation in accordance with generally accepted standards of care which exist in Central California at this time. It should be recognized that definition and evaluation of geologic conditions is a difficult and inexact science. Judgments leading to conclusions and recommendations are generally made with limited knowledge of subsurface conditions present. No warranty, expressed or implied, is made. 10 EXHIBITS Scale SITE LOCATION COLUMBUS North AquaGeosciences, Inc. 701 Westwind Drive Suite 103 [kersfield, California 93301 !lephone: (805) 328-0962 Fax 328-1129 Davies Oil Company 3305 1/2 Gulf Street Bakersfield, California VICINITY MAP Exhibit ~E ROAD Al~:a Open Space -- ~ North Scale 1"= 125' I I I Storage I I .~MW-14 MW-14A ~.MW-15 Jim's Steel and Supply Pipe Storage Teamsters Local Union No. 87 Pfiva~ Wcll Truck Wash Rush Swoape Properties Kexnville Stage And Freight Open Lot / I L~ Truck Parking I ~ -4'''~'~ ~ ~w- r:t,~ :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: I · IJa,i,:,-s~,~ I':-:i~l '; ~ I~i~:.ii~::!::i::i::?:!i!::iii::i::;!i::f:i:~ ~ Building , ST~, __ ~'~:!:::~ ,-~L'IW-I s"'""'~ :::::::::::::::::::::::::::::::::::: I I::~:':'l · ~A,.~ :"l, I ~ MW-3 [cz:a[ ,,~-~-,.-: .... : ~,~ ~ltmfion Galle~ AquaGeosciences, Inc. 4440 Grissom Street, Suite 100 Bakersfield, California 93313 Telephone: (805) 836-8100 Fax: (805) 836-8800 I , I DAVIES OIL COMPANY BAKERSFIELD, CALIFONIA PLOT PLAN MAP EXHIBIT 2 Al~a ~ North Scale 1"= 125' Olin Space PIERCE ROAD 385.36' 4~'MW- 14a I 388.48' I I =============================================================== ================================================================= LIPS Storage ,~a I Jim's --g i Steel I I , and ~ I I Supply { ! I Pipe Storage Key ~382' J Lines of equal elevation ~. Direction of inferred flow AquaGeosciences, Inc. 4440 Grissom St., Suite 100 Bakersfield, California 93313 Telephone: (805) 836-8100 Fax: {805) 836-88O0 · lVlW-8-~J-?..._] 1-] ~ I Dry: .... ; l..'~ Teamsters Local Union No. 87 Aband~ Pfivat* WeAl Kernville Stage And Freight Open Lot Track Wash Rush Swoape Properties [ DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA Groundwater Gradient Map for June 1995 Infiltration Gallery EXHIBIT 3 Open Space ~ North Scale 1"= 125' 387.93' 'I~'M~4a :::::::::::::::::::::::::: 390.90' I I I Storage Area I I Jim's Stol and Supply Pipe Storage ~382' J · Key Lines of equal elevation Direction of inferred flow PIERCE ROAD MW-12 390, I Teamsters Local Union I No. 87 I Abandxmed Priva~ Well I Track Wash Rush Swoape Properties Kemville Stage And Freight 11MW. ila I -~3~0.0s, NS I 390.22 ...... ,_0, 3~.~2' 390. Smrag* Building Infiltration Galler AquaGeosciences, Inc. 4440 Grissom St., Suite 100 Bakersfield, California 93313 Telephone: (805) 836-8100 Fax: (805) 836-8800 DAVIES OIL COMPANY BAKERSFIELD, CALIFORNIA Groundwater Gradient Map for September 1995 EXHIBIT 4 Al~a Nl~nv_ 14a PIERCE ROAD I Teamsters Local Union I No. 87 Rush Swoape Properties Open Space Storage Area I I Pipe Storage I Ab~ndan~d Privau~ Well I I Kernville Stage And Freight Track Wash Building ..- North Scale 1"= 125' KEY Lines of equal ~ > 1 00,000ppb coneentration~ ~ >10,O00ppb in p.rt~-per-billion ~'~> 1,000ppb ~ >100ppb Stc~ag© ND Davies Oil Company-- ND Islands ~ Infiltration Gallery AquaGeosciences, Inc. 4440 Gfissom St., Suite 100 Bakersfield, California 93313 Telephone: (805) 836-8100 Fax: (805) 836-8800 DAVI OIL COMPANY BAKERSFIELD, CALIFORNIA Groundwater -TPHg Concentration Contour Map for June 1995 EXHIBIT 5 Ng Mw- 14a :::::::::::::::::::::::::::::::::::::::::::::: omc, I hlvlW-15 ND I I Jim's Ste~l and Supply ,,-- Norlh Scale 1"= 125' 0 Pipe Storage KEY Lines of,qual coneentratiom in paas-per-billion V~ >100ppb PIERCE ROAD · % ::::::::::::::::::::::::::::::::::::::::::::: o I 1 I Teamsters Local Union ] No. 87 I Aban&la~l hiwt~ Well I Truck Wash Rush Swoape Properties Kernville Stage And Freight Open Lot Truck Parking Sts:~g¢ ND AquaGeosciences, Inc. 4440 Gfissom St., Suite 100 Bakersfield, California 93313 Telephone: (805) 836-8100 Fax: (805) 836-8800 II DAV~R/~ OX]L, COMPANY BAKERSFIELD, CALIFORNIA Groundwater -TPHg Concentration Contour Map for September 1995 EXI-ImlT 6 TABLES September 1995 Quarterly Groundwater Well Monitorir Data September 1995 Quarterly Groundwate~ Data MW-1 409.33 8-23' I 2" 19.35 389.98 MW-1 ND MW-lA 408.10 17,66 390.44 MW-lA ND MW-2 409.31 8.5-24.3" 2" 18.41 390.90 MW-2 ND MW-3 410.22 8.4-24.2' 2" 19.26 390.98 MW-3 ND MW-4 409.72 8.8-24.6' 2" 19.02 390.70 MW-4 ND MW-5 407.62 8.5-23.5' 2" 16.49 391.13 MW-5 ND MW-8 409.68 8.5-23.5' 2" 19.46 390.22 MW-8 ND MW-9 409.60 11.2-26.2' 2" NA MW-9 NS MW-lO 408.12 13.5-28.5' 2" 17.40 390.72 MW-lO ND MW-11 409.43 13.4-28.4 2' 18.22 MW-11 ND MW1 lA 407.68 2' 17.50 390.08 MW-1 lA ND MW-12 408.67 14.4-29.4' 2" 18.98 MW-12 NS MW-12a 17.61 MW-12a ND MW-13 409.91 17-47 4" 19.46 390.45 MW-13 ND MW-14 408.63 18-48' 4" NA MW-14 ND MW-14A 406.79 62.50 18.86 387.93 MW-14A ND MW-15 409.78 48.50 18-48' 4" 18.92 390.86 MW-15 ND MW-16 410.52 47.5 18-48' 4" 15.84 394.68 MW-16 ND RW-1 410.34 35' 15-35' 12" NA RW-1 NS ND ND ND NA ND ND ND NA ND 23 107 NA ND ND ND NA ND ND ND NA ND ND ND NA ND ND ND NA NS NS NS NS ND ND ND NA ND ND ND NA ND ND ND NA NS NS NS NS ND ND ND NA ND ND ND NA ND ND ND NA ND ND ND NA ND ND ND NA ND ND ND NA NS NS NS NA Corrected Groundwater Depth CDTW=DTW - (SP.G x LHT). CDTW = Corrected depth to water DTW = Measured depth to water SP.G = Specific gravity: unweathered gasoline = 0.75, diesel = 0.80 LHT = Measured li¢ thickness. NA = "Not Available" - well either dry or not found TPHg = Total Petroleum Hydrocarbons as gasoline TPHd = Total Petroleum Hydrocarbons as diesel ND = Below Practical Quantitetion Limits NS = NOT SAMPLED TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA RW-1 11/2/88 410.34 23.91 385.99 0.25 1/13/89 20.82 389.12 0.2 3/1 3/89 21.15 388.93 0.01 7/2/89 27.69 382.65 7/31/89 28.55 381.79 8/24/89 29.64 380.7 9/7/89 29,1 381.24 10/25/89 30.22 380.12 11/8/89 30.71 379,63 12/8/89 30.5 379.84 1/4/90 31.55 378.79 2/7/90 31.65 378.69 2/1 9/90 30.31 380.03 5/31/90 33.1 377.24 COCR 7/25/90 34,5 375.84 COCR 8/1 6/90 35.1 375.24 COCR 1/11/91 DRY DRY 4/5/91 DRY DRY 6/15/91 DRY DRY 1 2/9/93 26.09 384.25 NO ODOR 3/30/94 25.80 384.54 NOODOR 6/3/94 25.96 384.38 NOODOR 8/23/94 27.49 382.85 12/5/94 Not Sampled Not Sampled 3/3/95 Not Sampled Not Sampled 6/1/95 Not Sampled Not Sampled TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-1 7/11/86 409.33 24.18 14.86 394.47 4" free prod. 5/8/87 18.23 391.1 0.5' 10/22/87 19,72 389.61 0.06' 12/3/87 20.66 388.67 0.8' 3/4/88 19.09 390.24 0.25' 5/2/88 21.24 388.09 0.2' 11/2/88 22.83 386.5 Strong Odor 1/13/89 19.93 389.38 3/1 4/89 20.22 389,11 6/26/89 DRY DRY 1 0/25/89 DRY DRY 1/4/90 CRY CRY 3/6/90 DRY CRY 1/11/91 DRY CRY 4/5/91 DRY ~ 6/15/91 DRY Dt::IY 9/20/93 DRY CRY STRONG ODOR 12/9/93 DRY CRY 3/30/94 DRY DRY 6/2/94 DRY DRY 8/23/94 CRY DRY 1 2/5/94 DRY DRY 3/3/95 DRY DRY 6/5/95 20.31 389.02 Oily film 8/1 6/95 19.35 389.98 9/4/92 408.10 61.5 34.98 373.12 9/20/93 25.28 382.82 12/9/93 23.73 384.37 3/30/94 23.47 384.63 6/2/94 23.64 384.46 8/23/94 25.13 382.97 12/5/94 27.08 381.02 3/3/95 23.88 384.22 6/5/95 19.72 388.38 8/1 6/95 17,66 390.44 MW-lA No Odor No Odor TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-2 7/11/86 409.31 24.3 15,02 394.29 12/19/86 17.87 391,44 5/8/87 NA NA 10/22/87 19.35 389.96 12/3/87 20,43 388.88 3/5/88 19,07 390.24 5/2/88 20,7 388,61 11/2/88 22,79 382,56 1/13/89 20.04 389.27 3/13/89 20,45 388,86 6/26/89 DRY DRY 1 0/5/89 DRY DRY 3/6/90 DRY DRY 1/11/91 DRY CRY 4/5/91 DRY DRY 6/15/91 DRY DRY 9/20/93 DRY DRY 1 2/9/93 DRY DRY 4/1/94 CRY DRY 6/2/94 DRY' DRY 8/23/94 DRY DRY 1 2/5/94 DRY DRY 3/3/95 ERY CRY 6/5/95 20,53 388,78 8/1 6/9.5 18.41 390,90 NO PRODUCT COOR NO ODOR SLIGHT ODOR SUGHT ODOR STRONG ODOR TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-3 7/11/86 410.22 23.7 15.37 394.85 NO PRODUCT 5/8/87 18.34 391.88 1 0/22/87 20 390.22 SLIGHT ODOR 1 2/3/87 20.77 389.45 SUGHT ODOR 3/5/88 19.42 390.8 DIESELODOR 5/2/88 21.1 389.12 SLIGHT ODOR I 1/2/88 22.86 387.36 DIESELODOR 1/13/89 20.2 390.02 3/1 3/89 20.77 389.45 1 0~5~89 CRY DRY 11/9/89 DRY CRY 1/4/90 DRY CRY 2/7/90 DRY DRY 3~6~90 DRY DRY 1/11/91 DRY DRY 4/5/91 DRY CRY 6/15/91 DRY DRY 9/20/93 DRY DRY 12/9/93 DRY DRY 3~30~94 DRY DRY 6/2/94 DRY DRY 8/23/94 CRY DRY 1 2/5/94 DRY DRY 3/3/95 DRY CRY 6/5/95 21.22 389.00 8/15/95 19.26 390.96 TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-4 7/11/86 409.72 15.06 394.66 5/8/87 17.87 391.85 10/22/87 18,46 391.26 12/3/87 20.41 389.31 3/5/88 19.03 390.69 5/2/88 20.58 389.14 11/2/88 22.5 389.2 1/13/89 20.08 389.64 3/1 3/89 20.3 389.42 6/26/89 DRY CRY 1 0/5/89 DRY DRY 11/9/89 ERY DRY 1/4/90 DRY DRY 2/7/90 DRY DRY 3/6/90 DRY DRY 1/11/91 DRY DRY 4/5/91 DRY CRY 6/15/91 DRY DRY 9/20/93 DRY CRY 1 2/9/93 DRY DRY 3/30/94 ERY CRY 6/2/94 DRY CRY 8/23/94 CRY DRY 12/5/94 DRY CRY 3/3/95 DRY DRY 6/5/95 DRY CRY 8/15/95 19.02 390.70 TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA rvlW-5 3/13/89 407.62 23.3 18.32 389.3 6/26/89 21.79 385.83 1 O/25/89 DRY CRY 9/21/93 DRY CRY 12/9/93 CRY DRY 4/1/94 DRY DRY 6/2/94 ERY DRY 8/23/94 DRY CRY 1 2/5/94 DRY DRY 3/3/95 22.28 385.34 6/1/95 19.48 388,14 8/1 6/95 16.49 391.13 TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-8 5/8/87 409.68 24.6 I 8 391.68 1 0/22/87 19.6 390.08 12/3/87 20.6 389.88 3/4/88 19.27 390.41 5/2/88 DRY DRY 11/2/88 CRY CRY 1/13/89 DRY CRY 3/13/89 20.7 388.98 6/26/89 DRY DRY 10/5/89 DRY CRY 11/9/89 DRY DRY 1/4/90 DRY DRY 2/7/90 CRY DRY 3/6/90 DRY DRY 1/11/91 CRY DRY 4/5/91 CRY DRY 6/15/91 DRY DRY 9/20/93 DRY DRY 1 2/9/93 DRY CRY 3/30/94 DRY DRY 6/2/94 DRY DRY 8/23/94 DRY DRY 1 2/5/94 DRY DRY 3/3/95 DRY DRY 6/1/95 DRY DRY 8/1 5/95 19.46 390.22 TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-9 5/8/87 406.6 15.37 391.23 10/22/87 17.38 389.22 1 2/3/87 18.12 388.48 3/4/88 16.7 389.9 5/2/88 18.26 388.34 11/2/88 DRY DRY 1/13/89 17.87 388.72 3/13/89 18.2 388.4 6/26/89 DRY CRY 1 0/5/89 DRY DRY 11/9/89 DRY DRY 1/4/90 DRY DRY 2/7/90 DRY DRY 3/6/90 DRY DRY 1/11/91 DRY DRY 4/5/91 DRY DRY 6/15/91 DRY CRY 12/9/93 Can't locate Can't locate 3/30/94 Can't locate Can't locate 6/2/94 Can't locate Can't locate 8/23/94 Can't Locate Can't Locate 12/5/94 Can't Locate Can't Locate 3/3/95 Can't Locate Can't Locate 6/1/95 Can't Locate Can't Locate 8/15/95 Can't Locate Can't Locate TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-10 3/5/88 408.12 27 17.52 390.6 5/2/88 19.28 389.04 I 1/2/88 21 387.12 1/13/89 18.36 389.76 3/13/89 18,82 389.3 6/26/89 22.52 385.6 7/27/89 23.2 384.92 10/5/89 24.53 383.59 1/4/90 26.42 381.7 2/7/90 27.09 381.03 3~6~90 DRY DRY 1/11/91 CRY DRY 4/5/91 DRY ~ 6/15/91 DRY DRY 9/21/93 24,72 383.4 12/9/93 23,31 384.81 3/30/94 23.14 384.98 6/2/94 23.18 384.94 8/23/94 24,59 383.53 1 2/5/94 DRY DRY 3/3/95 23.46 384.66 6/5/95 19.34 388,78 8/15/95 17.40 390.72 TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-11 3/5/88 409.43 26.58 19.23 390.2 5/2/08 20.78 388.65 I 1/2/88 23.57 385.56 1/13/89 20.62 388.81 3/1 3/89 20.63 388.8 6/26/89 24.37 385.06 7/27/89 25.95 384.24 1 O/5/89 DRY DRY 1/4/90 DRY CRY 2/7/90 CRY DRY 3/6/90 DRY DRY 1/11/91 DRY DRY 4/5/91 DRY DRY 6/15/91 DRY DRY 9/20/93 DRY DRY 1 2/9/93 25.55 383.88 3/30/94 25.19 384.24 6/2/94 25.42 384.01 8/23/94 26,96 382.47 12/5/94 DRY DRY 3/3/95 24.64 384.79 6/5/95 20.21 389.22 STRONG ODOR NO PRODUCT I 0.75' free pro( 0.5' 0.3' 0.01' 1.02' STRONG ODOR STRONG ODOR STRONG ODOR STRONG ODOR STRONG ODOR STRONG ODOR STRONG ODOR 8/1 6/95 18.22 not sampled MW-11A 9/4/92 *407,58 34.8 372.78 12/9/93 Not sampled Not Sampled 3/30/94 23.39 384.19 6/2/94 23.58 384.00 8/23/94 25.07 383.51 12/5/94 27.38 380.20 3/3/95 23,88 383,70 6/5/95 19.25 388.33 8/1 6/95 17.50 390.08 TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-12 408.67 27.3 3~5~88 18.62 390.05 STRONG ODOR 5~2~88 20.16 388,51 SLIGHT ODOR 11/2/88 22.86 385.81 0.5' free prod 1/13/89 19.81 388.86 0.2' 3/1 3/89 20.02 388.65 0.1' 6/26/89 24.54 384.77 0.94' 7/27/89 25,39 384.05 1.02' 10/5/89 26.6 383.08 0.35' 1/4/90 DRY DRY STRONG ODOR 2 / 7 / 9 0 CRY CRY STRONG ODOR 3/6/90 CRY DRY 1/11/91 DRY CRY 4/5/91 DRY DRY 6/15/91 DRY DRY 9/21/93 26.83 381.84 12/9/93 25.13 383.54 4/1/94 24.68 383.99 STRONG ODOR 6/2/94 24.91 383.76 STRONG ODOR 8/23/94 26.71 381.96 I 1 2/5/94 DRY DRY STRONG ODOR 3/3/95 25.54 383.13 6/5/95 21.13 387.54 8/1 6/95 18.96 not sampled MW-12A 3/3/95 unknown 63.36 24.12 unknown 6/1/95 19.74 unknown 8/1 6/95 17.61 unknown TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-13 1/10/91 409.91 48 NA NA 4/5/91 DRY DRY 6/15/91 DRY DRY 9/4/92 40.94 368.97 9/20/93 29.21 380.7 12/9/93 26.71 380.2 3/30/94 25.72 384.19 6/2/94 25.84 384.07 8/23/94 32.09 377.82 12/5/94 29.20 380.71 3/3/95 27.10 382.81 6/5/95 22.03 387.88 8/1 5/95 19.46 390.45 PETROL ODOR 1/10/91 408.63 NA NA 4/5/91 DRY CRY 6/15/91 DRY CRY 12/9/93 Not Sam31ed Not Sampled 3/30/94 Not Sam31ed Not Sampled 6/2/94 Not Sam31ed Not Sampled 8/23/94 Not Sam31ed Not Sampled 12/5/94 Not Sam31ed Not Sampled 3/3/95 Not Sam31ed Not Sampled MW-14 6/1/95 Not Sam31ed Not Sampled 8/1 5/95 · Not Sampled Not Sampled TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-14A 9/4/92 406.79 62.5 41.25 365.54 9/20/93 28.6 378.19 12/9/93 25.84 379,83 3/29/94 24.64 382.15 6/2694 24,96 381.83 8/23/94 29.60 377.19 12/5/94 28.28 378.51 3/3/95 26,77 380.02 6/5/95 21.43 385.36 NOODOR 8/15/95 18.86 387.93 MW-15 111 0/91 409.78 48.5 NA NA 4/5/91 DRY DRY 6/15/91 DRY DRY 9/4/92 40.15 369.63 9/20/93 27.65 382.18 12/9/93 25.32 381.47 3/29/94 24.43 385.35 6/2/94 22.78 387.00 8/23/94 30.51 379.27 12/5/94 28.36 381.42 3/3/95 26.49 383.29 6/5/95 21.30 388.48 8/15/95 18.92 390.86 NO ODOR TABLE 2 HISTORICAL GROUNDWATER MONITORING LIQUID LEVEL DATA MW-16 9/4/92 410.52 32.28 378.24 9/21/93 23.38 387.14 12/9/93 22.25 385.25 3/30/94 22.18 388,34 6/2/94 22.2 388.32 8/23/94 26,28 384.24 1 2/5/94 25.72 384.8 3/3/95 21.46 389.06 6/5/95 17.72 392.8 8/1 5/95 15.84 394.68 NOODOR I TABLE 3 HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA RW-1 12/9/93 ND 1 ND ND ND ND 3/30/94 ND 1 ND 1 ND ND 6/3/94 1 3 ND 15 1700 NA 8/23/94 ND ND ND 15 ND NA 12/5/94 NS NS NS NS NS NS 3/3/95 NS NS NS NS NS NS 6/1/95 NS NS NS NS NS NS 8/16/95 NS NS NS NS NS NS MW-1 5/8/87 FLH FLH FLH FLH FU-I FLH 10/22/87 FLH FLH FLH FLH FLH FM-I 3/4/88 FI.H FM'I FLH FU"I FLH FLH 3/14/89 FLH FLH FU'I FLH FU-I FU-I 3 / 1 / 90 DRY WELL DRY WELL · DRY WELL DRY WELL DRY WELL DRY WELL 1 / 11/91 DRYWELL DRY WELL DRY WELL DRYWELL DRY WELL DRYWELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRY WELL 'DRY WELL DRY WELL DRYWELL DRY WELL 9 / 20 / 93 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/9/93 DRYWELL DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL 3 / 30 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6 / 2 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 8 / 23 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/5/94 DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL DRYWELL 3 / 3 / 95 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/1/95 ND ND ND ND 980 NA 8/16/95 ND ND ND ND ND NA MW-lA 9/15/92 1 2 120 NA 120 NA NA 9/20/93 ND 7 I 8 1300 ND 12/9/93 ND 4 ND ND ND ND 3/30/94 ND 1 ND 2 ND ND 6/2/94 ND ND ND 1 200 ND 8/23/94 ND 1 ND 3 ND NA 12/5/94 ND ND ND 1.2 ND ND 3/3/95 1.7 1 0.9 5.2 ND ND 6/1/95 ND ND ND ~ 180 5220 NA FLH = Floating Liquid Hydrocarbons NS = Not Sampled NA = Not Analyzed I ND = Below the Indicated detection limit as labeled In the analytical Labora ory reports. I TABLE 3 I HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-2 7/11/86 400 310 I~) 550 11000 NA 12/19/86 9 120 I~) 330 930 NA 5/8/87 89 <0.5 <0.5 89 4100 < 1 10/22/87 5 22 <0.5 12 ND 13000 3/4/88 13 2 5 39 1300 ND 3/14/89 5 20 <10 20 4000 ND 10/5/89 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/1/90 DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL 1 / 11/91 DRY WELL DRY WELL DRY WELL DRYWELL DRY VVELL DRYVVELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 9 / 20 / 93 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/9/93 DRYWELL DRYWELL DRYWELL DRY WELL DRYWELL DRY WELL 4/1/94 DRYWELL DRY WELL DRY WELL DRY WELL DRYWELL DRY WELL 6/2/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 8 / 23 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/5/94 DRY WELL DRY WELL DRY WELL DRYWELL DRYWELL DRY WELL 3 / 3 / 95 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/5/95 910 3180 ND 5140 33040 NA 8/16/95 ND ND ND 23 107* NA MW-3 7/11/86 43 110 NA 170 61 O0 ND 5/8/87 0.9 <0.5 <0.5 <0.5 354 6.2 10/22/87 < 1 3 1 1 12000 ND 3/4/88 <0.1 <1 <1 <1 ND 29000 3/14/89 <0.2 <2 <2 <2 600 ND 10/5/89 DRY WELL DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL 3/1/90 DRYWELL DRY WELL DRY WELL DRYWELL DRYWELL DRY WELL 1 / 11/91 DRYWELL DRYWEI I DRYWELL DRYWELL DRYWELL DRY WELL 4 / 5 / 91 DRY WEM. DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 9/20/93 DRYWELL DRY WELL DRYWELL DRYWELL DRYWELL DRYWELL 12/9/93 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3 / 30 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/2/94 DRYWELL DRY WELL DRYWELL DRYWELL DRYWELL DRYWELL 8 / 23 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12 / 5 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 DRYWELL DRYWELL DRYWELL DRYWELL 'DRYWELL DRYWELL 6/5/95 ND 800 ND 1450 1280 NA 8/16/95 ND ND ND ND ND NA *Note: The analytical result presented In this table Is the result for MW-20, In the analytical :lata sheets. MW-20 Is a duplicate sample for MWo2. / I FLH = Floatin(~ Liquid Hydrocarbons NS = Not Sampled I NA = Not Analyzed I ND = Below the Indicated detection limit as labeled In the analytical Labora ory reports. I TABLE 3 ! HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-4 7/11/86 I~D I~) NA fi fid NA 5/8/87 1,8 7.6 <0,5 5,2 22 <1 10/22/87 0.1 <1 <1 <1 <50 ND 3/4/88 <0.1 <1 <1 <1 <50 ND 3/14/89 <0.2 <2 <2 <2 <50 fi 10/5/89 DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 3 / 1 / g 0 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 1 / 11/91 DRYWELL DRY WELL DRYWELL DRY WELL DRYWELL DRY WELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 9 / 20 / 93 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/9/93 DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3 / 30 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6 / 2 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 8 / 23 / g 4 DRY WEll DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/5/94 DRYWELL DRYWELL DRY WELL DRYWELL DRY WELL DRYWELL 3 / 3 / 95 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6 / 1 / 95 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 8/15/95 fi fi fi fi fi NA MW-5 9/20/93 DRYWELL DRY WELL DRYWELL DRYWELL DRYWELL DRYWELL 12/9/93 DRYWELL DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL 4 / 1 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6 / 2 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 8 / 23 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12 / 5 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 M3 kD kD kD kD kD 6/1/95 fi fi fi fi fi fi 8/16/95 kD fi fi fi fi NA MW-8 5/8/87 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 10/22/87 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 3/4/88 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 3/14/89 ' <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 10/5/89 DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 3/1/90 DRY WELL DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL 1 / 11 / 91 DRY WELL DRY WELL DRY WELL DRY WELL ' DRY WELL DRY WELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL g / 20 / g 3 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/9/93 DRY WELL DRY WELL DRY WELL DRYWELL DRYWELL DRY WELL 3/30/94 DRYWEH DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 6/2/94 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 8 / 23 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/5/94 DRY WELL DRY WEH DRY WELL DRYWELL DRYWELL DRY WELL 3/3/95 DRYWELL DRYWEL DRYWELL DRYWELL DRYWELL DRYWELL · 6/1/95 DRYWELL DRY WEL DRYWELL DRY WELL DRY WEH DRY WELL 8/15/95 fi fi fi fi fi DRY WELL I TABLE 3 I HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-9 5/8/87 1155 3810 1740 15380 33400 <1 10/22/87 1 0 1600 2200 37000 170000 ND 3/4/88 40 1100 3600 28000 70000 ND 3/14/89 31 120 2200 11000 56000 ND 10/5/89 DRY WELL DRYWELL DRYWEI I DRYWELL DRYWELL DRY WELL 3/1/90 DRY WELL DRY WELL DRYWELL DRYWELL DRYWELL DRY WELL 1 / 11/91 DRY WELL DRYWELL DRYWELL DRY WELL DRY WELL DRY WELL 4/5/91 DRYWELL DRYWELL DRYWELL DRYWELL · DRYWELL DRYWELL 6/15/91 DRYWELL DRY WELL DRYWELL DRYWELL DRY WELL DRYWELL 9/20/93 NS NS NS NS NS NS 12/g/g3 NS NS NS NS NS NS 3/30/94 NS NS NS NS NS NS 6/2/94 NS NS NS NS NS NS 8/23/94 NS NS NS NS NS NS 12/5/94 NS NS NS NS NS NS 3/3/95 NS NS NS NS NS NS 6/1/95 NS NS NS NS NS NS NS NS NS NS NS NS NS MW-10 3/4/88 2.2 <1 <1 2 <50 ND 3/1 4/89 <0.2 <2 <2 <2 <50 ND 10/5/89 <0.2 <2 <2 <2 <50 ND 3/1/90 DRY WELL DRYWELL DRYWELL DRYWELL DRY WELL DRY WELL 1 / 11/91 DRY WELL DRYWELL DRYWELL DRYWELL DRY WELL DRYWELL 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL DRYWELL 9/20/93 ND ND ND ND ND ND 12/9/93 ND ND ND ND ND ND 3/30/94 ND 1 1 7 ND ND 6/2/94 ND ND ND 9 6000 ND 8/23/94 ND ND ND 1 ND NA 12/5/94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 1.7 1 0.9 5.4 ND ND 6/5/95 ND ND ND ND ND NA 8/16/95 ND ND ND ND ND NA FLH = Floatln~ Liquid Hydrocarbons NS = Not Sampled I NA = Not Analyzed I ND = Below the Indicated detection limit as labeled In the analy~ical Labora 3ry reports, I TABLE 3 HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA MW-11 3/4/88 10000 89000 3200 37000 240000 3/14/89 FLH FLH FLH FU-I FLH FLH 10/5/89 FLH FLH FLI'-I FLH FLH FLH 3/1/90 DRY WELL DRY WELL DRY WELL DRY WELL DRYWELL DRYWELL 1 / 11/91 DRY WELL DRY WELL DRY WELL DRY WELL DRYWELL DRYWELL 4/5/91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRYWELL DRY WF_LL DRYWELL DRYWELL DRYWELL DRY WELL 9 / 20 / 93 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 12/9/93 27 280 220 630 4300 ND 3/30/94 10 120 70 4800 120000 ND 6/3/94 ND ND 5 290 19000 8/23/94 7 11 53 400 66000 NA 12 / 5 / 94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 21 3.4 2.9 75 7200 6/5/95 ND 170 ND 410 1622 NA 8/16/95 ND ND ND ND ND NA MW-1 lA 9/15/92 1.3 1 7 NA 75 NA NA 9/20/93 NS NS NS NS NS NS 12/9/93 NS NS NS NS NS NS 3/30/94 ND ND ND 9 ND ND 6/3/94 ND ND ND 4 300 8/23/94 ND ND ND 4 ND NA 12/6/94 ND ND ND 0.7 ND ND 3/3/95 1 6 9 4.5 ND ND 6/5/95 140 240 320 1040 850 NA 8/16/95 ND ND ND hD ND NA MW-12 3/4/88 600 4200 3700 42000 100000 ND 3/14/89 FLH FU-I FLH FLH FI.H FLH 10/5/89 FLH FU.-I FLH FLH FLH FLH 3 / 1 / 90 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 1 / 11/91 DRY WELL DRY WELL DRYWELL DRYWELL DRY WELL DRYWELL 4/5/91 DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL DRYWELL 6/15/91 DRYWELL DRYWELL DRYWELL DRYWELL DRY WELL DRY WELL 9/20/93 230 2800 620 1300 150000 12/9/93 30 1200 1200 6700 39000 ND 4/1/94 70 780 920 51 O0 220000 ND 6/3/94 10 160 40 680 185000 NA 8/23/94 19 34 250 1400 .! 87000 NA 1 2/5/94 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/3/95 7 6 52 410 40000 ND 6/5/95 120 250 ND 590 5110 NA 8/16/95 NS NS NS NS NS NS I I TABLE 3 HISTORICAL GROUNDWATER MONITORING [ ...................... ANALYTICAL DATA MW-12A 3/3/95 I~) ND NO 1.8 32000 ND 6/1/95 ND ND ND ND ND ND 8/16/95 ND ND ND ND ND NA MW-13 1 / 11/91 2 1.2 1.2 0.8 <50 <50 4 / 5 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL DRY WELL 9/15/92 ND ND NA ND NA NA 9/20/93 5 1 2 I 59 12000 ND 12/9/93 8 9 4 ND ND ND 3/30/94 9 9 ND 230 8100 ND 6/2/94 3 3 2 27 16000 ND 8/23/94 1 1 8 17 460 NA 12/5/94 2.4 5.3 7.1 10 1100 ND 3/3/95 ND ND ND ND ND ND 6/5/95 ND ND ND ND ND NA 8/15/95 ND ND ND ND ND NA MW-14 1/11/91 30 3,6 42 32 1100 <50 4/5/91 DRY WELL DRY WELL DRYWELL DRY WELL DRY WELL DRY WELL 6 / 15 / 91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL 3/30/93 NS NS NS NS NS NS 6/2/94 NS NS NS NS NS NS 8/23/94 NS NS, NS NS NS NS 12/5/94 NS NS NS NS NS NS 3/3/95 NS NS NS NS NS NS 6/5/95 NS NS NS NS NS NS ' 8/15/95 ND ND ........ .1~ .................. I~ ...... J ...... ~ ................... I~!...A.. ........... MW-14A 9/15/92 1.8 ND NA ND NA NA 9/20/93 ND ND ND ND ND ND 12/9/93 ND ND ND ND ND ND 3/29/94 ND ND ND ND ND ND 6/2/94 2 4 ND 2 ND ND 8/23/94 ND ND I 3 ND NA 12/5/94 ND ND ND 0.6 ND ND 3/3/95 1.6 0.9 ND 3.6 89 ND 6/5/95 ND ND ND 220 ND NA 8/16/95 ND ND ND ND ND NA I TABLE 3 I HISTORICAL GROUNDWATER MONITORING ANALYTICAL DATA ,MW-15 1/11/91 1.5 1.1 1 0.5 <50 <50 4/5/91 DRY WELL DRYWELL DRYWELL DRY WELL DRY WELL DRY WELL 6/15/91 DRY WELL DRY WELL DRY WELL DRY WELL DRY WELL DRYWELL 9/15/92 ND I~) NA I~D NA NA 9/20/93 I~ I~) I~ I~ I~) IXD 12/9/93 I~) 1 I~ I~ ND ND 3/29/94 ND ND ND ND ND ND 6/2/94 ND ND ND ND ND ND 8/23/94 ND ND ND ND ND NA 12/5/94 ND ND ND ND ND ND 3/3/95 1.6 I 0.9 5.4 ND ND 6/5/95 ND ND ND ND 510 NA 8/15/95 ND ND ND ND ND NA MW-16 1/11/91 <0,1 <0.5 <0.5 <0.5 <50 <50 4 / 5 / 91 NA NA NA NA NA NA 6/15/91 NA NA NA NA NA NA 9/15/92 ND ND NA ND NA NA 9/20/93 ND ND ND ND ND ND 12/9/94 ND ND ND ND ND ND 3/30/94 ND ND ND ND ND ND 6/2/94 ND ND ND ND ND ND 8/23/94 ND ND ND 1 ND NA 12/5/94 ND ND ND 0.8 ND ND 3/3/95 1.6 0.7 ND 2.3 ND ND 6/5/95 ND ND ND ND ND NA 8/15/95 ND ND ND ND ND NA NA = Not Analzed NS = Not Sampled ND = Below the Indicated detection limit as labeled in the analytical Labora iory reports. APPENDIX A, GR 0 UND WA TER P URGE DATA SHEETS AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD ~ Groundwater Scientists · Environmental Consultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~AMPLE ID OR WELL NO.: MW-1 DEPTH TO WATER: 19.35' PROJECT NO.: TOTAL DEPTH OF WELL: 24.18 PROJECT NAME: OAWES OIL COMPANY WELL DIAMETER: 2" DATE: 8/16/95 CASING VOLUME: 0.75 gallons SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KV Purge Pump PtIRGE CHARA(;TI~RISTI CS SEC SAMPLE TEMP pH REMARKS TIME INTAKE RATE CUM. VOL. WELL VOL (pmhos/ CONTROL 1 310 DEPTH (GPM) (GAL) PUMPED (*C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1311 0.5 0.66 77.0 5.67 587 Rusty Color - V. Sit. Odor 1312 1.0 1.2 76.0 6.08 571 Clear- Sit. Odor 1313 1.5 1.8 75.7 6.24 554 Clear - Sit. Odor 1314 2.0 2.4 75.8 6.36 545 Clear- Sit. Odor 1315 2.5 3.3 75.8 6.38 538 Clear - Sit. Odor q 320 MW-1 pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION ~H 4.01 pH 7.0 )H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/~MHOS / CM @ 25* C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLEDAT 19.35 FT. FINAL DEPTH TO WATER 19.35 FT. 3CASINGVOLUMES= GALS. I~NOTES: AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD ~' Groundwater Sdentists · Environmental Consultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~AMpLE ID OR WELL NO.: MW-lA DEPTH TO WATER: 17.66' PROJECT NO.: TOTAL DEPTH OF WELL: 61.50' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 8/16/95 CASING VOLUME: 26.23 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: PURGE PUMP pu ~GE CHARACTERISTICS SEC SAMPLE TEMP pH REMARKS ~mhos/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOl (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1048 DEPTH (GPM) (GAL) PUMPED 1057 ZZ' 10 0.38 73.4 6.86 192 NO ODOR, CLEAR Z0 0.76 73.7 6.60 189 NO ODOR, CLEAR 11 Z0 30 1.14 73.5 6.82 201 SLT'LY YELLOW, V. SLT. ODOR 1124 40 1.52 75.7 6.73 204 SLT'LY YELLOW, V. SLT. ODOR 1127 50 1.90 72.4 6.7Z 197 NO ODOR, CLOUDY "3 130 60 2.?8 72. ! 6.72 ZOO CLOUDY YELLOW - NO ODOR 1135 70 2.66 72.4 6.67 203 CLOUDY YELLOW - NO ODOR 1140 80 3.04 72.4 6.69 205 NO ODOR, CLEAR 1145 MW-lA pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION ~H 4.01 pH 7.0 pH 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ Z5° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 18.04 FT. FINAL DEPTH TO WATER 18.12 FT. 3 CASING VOLUMES= 78 GALS. mJJINOTES: AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD .a. GrotmdwaterSdentists · EnviroranentalConsultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ItAMPLE ID OR WELL NO.: Mw-2 DEPTH TO WATER: 18.41' PROJECT NO.: TOTAL DEPTH OF WELL: 24.30 PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 2" DATE: 8/16/95 CASING VOLUME: 0.92 ~lallons SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KY Purge Pump pURGE CHARACTERISTICS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL. WELL VO[ TEMP pH (/~mhos/ CONTROL 1525 DEPTH (GPM) (GAL) PUMPED (°c) (uNrrs) cm) NO. (COLOR, TURBIDITY, ETC.) 1526 21' 0.5 0.54 74.6 6.80 478 Rusty Brn. - V. SIt. Odor 1527 1.0 1.08 74.0 6.40 489 Brown, V. SIt. Odor 1528 1.5 1.63 73.8 6.23 462 Clear Grey - Mod. Odor 15Z9 Z.0 2.17 73.4 6.Zl 460 Clear Yellow Strong to Mod. Odor 1530 Z.5 2.71 73.4 6.21 458 Clear Yellow ~ Stron~l to Mod. Odor '1531 3.0 3.20 73.4 6.20 458 Clear Yellow Strong to Mod. Odor 1535 MW-2 pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 :)H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25* C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT FT. FINAL DEPTH TO WATER FT. 3 CASING VOLUMES = 2.7 GALS. I liNOTES: MW-Z0 is a duplicate of Mw-2 AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD ~ OrotmdwaterSden~sts · Environmental Consultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 IDAMPLE ID OR WELL NO.: MW-3 DEPTH TO WATER: 19.26' PROJECT NO.: TOTAL DEPTH OF WELL: 23.70 PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 2" DATE: 8/15/95 CASING VOLUME: 0.69 gallons SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KV Purge Pump PURGE CHARACTERISTICS SEC SAMPLE TEMP pH REMARKS ~mhos/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOL (°C) (UNITS) cra) NO. (COLOR, TURBIDITY, ETC.) 0957 DEPTH (GPM) (GAL) PUMPED 0958 0.5 0.72 74.9 7.49 606 Slightly Cloudy - Mod. Odor 0959 1.0 1.44 74.9 7.50 645 Slightly Cloudy - Mod. Odor 1000 1.5 2.17 74.7 5.90 637 Slightly Cloudy- Mod. Odor 1001 2.0 2.89 74.7 5.84 634 Slightly Cloudy - Mod. Odor 1002 2.5 3.62 74.8 5.82 629 Slightly Cloudy - Mod. Odor '"~010 MW-3 pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 3H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 71 8 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 19.28 FT. FINAL DEPTH TO WATER19'28 FT. 3 CASING VOLUMES=2'09 GALS. I~tNOTES: AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD "' Groundwater Sdentists · Environmental Consuitanlm AN D WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~kMPLE ID OR WELL NO.: DEPTH TO WATER: MW-4 19.02' PROJECT NO.'. TOTAL DEPTH OF WELL: 23.62 PROJECT NAME: 'DAVIES OIL COMPANY WELL DIAMETER: 2" DATE: 8/15/95 CASING VOLUME: 0.72 §allons SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KY Purge Pump pURGE CHARACTERIST CS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL WELL VOL TEMP pH ~mhos/ CONTROL DEPTH (GPM) (GAL) PUMPED (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1541 0.5 0.69 74.9 7.76 273 Silty Brown - No Odor 1544 1.0 1.38 73.8 7.52 267 Silty Brown - No Odor 1546 1.5 2.08 73.4 7.48 265 Silty Brown - No Odor 1548 2.0 2.77 73.4 7.40 270 Clear - No Odor 1550 2.5 3.47 73.3 7.29 272 Clear - No Odor / BUFFER SOLUTION :). 4.01 p. 7,0 ip. 10,0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 19.02 FT. FINAL DEPTH TO WATER 19.02 FT. 3 CASING VOLUMES=2.17 GALS. AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD '" Groundwater Scientists · EnvironmentalConsultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~,MPLE ID OR WELL NO.: DEPTH TO,WATER: MW-5 16.49' PROJECT NO.: TOTAL DEPTH OF WELL: 23.32 PROJECT NAME: DAVIES Oil COMPANY WELL DIAMETER: 2" DATE: 8/16/95 CASING VOLUME: 1.07 gallons SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KV Purge Pump PURGE CHARACTERISTICS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL, WELL VOl TEMP pH (pmhos/ CONTROL 0922 DEPTH (GPM) (GAL) PUMPED (°C) (UNITS) em) NO. (COLOR, TURBIDITY, ETC.) 0923 0.5 0.46 75.3 7.30 309 Rusty Brown - No Odor 0924 1.0 0.93 74.6 7.20 285 Rusty Brown - No Odor 0925 1.5 1.40 74.3 7.14 273 Clear Brown - No Odor 0926 2.0 1.89 74.1 7.10 272 Clear Brown - No Odor 0927 2.5 2.33 74.1 7.09 272 Clear - No Odor 3.0 2.80 74.1 7.10 272 Clear - No Odor 0929 3.5 3.27 74.1 7.08 271 Clear- No Odor 0933 MW-5 pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION 3H 4.01 pH 7.0 DH 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/./MHOS / CM ~ 25* C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 16.49 FT. FINAL DEPTH TO WATER 16.49 FT. 3 CASING VOLUMES= 3.21 GALS. AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD ~' GtotmdwaterSd. entists · ~nvttonmenta] Consultants AND WELL DEVELOPMENT DATA 4440 Gfissom St. Suite 100 * Bakersfield, California 93313 ~AMPLE ID OR WELL NO.: Mw-8 DEPTH TO WATER: 19.46' PROJECT NO.: TOTAL DEPTH OF WELL: 23.63 PROJECT NAME: OAWES O~L COMPANY WELL DIAMETER: 2" DATE: 8/15/95 CASING VOLUME: 0.65 gallons SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KY Purge Pump pu RGE CHARACTERISTICS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL. WELL VOI TEMP pH (jumhos/ CONTROL DEPTH (GPM) (GAL) PUMPED (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1609 0.5 0.76 74.1 7.29 477 Cloudy- Slight Odor 1 611 1.0 1.40 73.3 7.28 472 Clear - Slight Sewer Odor 1613 1.5 2.30 73.1 7.24 467 Clear - No Odor 1615 2.0 3.07 73.0 7.19 470 Clear- No Odor 1617 ?.5 3.84 73.0 7.19 469 Clear - No Odor MW-8 pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 ~H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 19.46 FT. FINAL DEPTH TO WATER 19.46 FT. 3 CASING VOLUMES =1.95 GALS. AquaGeosciences, I c. WATER QUALITY SAMPLING RECORD ~" Groundwater Scientists · EnvironmentalConsultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~AMPLE ID OR WELL NO.: MW-10 DEPTH TO WATER: 17.40' PROJECT NO.: TOTAL DEPTH OF WELL: 27.0' PROJECT NAME: DAVIES Oil COMPANY WELL DIAMETER: 2" DATE: 8/15/95 CASING VOLUME: 1.5 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KV PURGE PUMP pI,IRGE CHARACTERISTICS SEC; SAMPLE TEMP pH REMARKS ~mhos/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOL (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GPm) (GAL) PUMPED 1023 1 0.6 73.3 6.90 303 CLEAR, V. SLT. ODOR 1025 2 1.2 73.3 6.92_ 304 CLEAR, NO ODOR 1026 3 2.0 73.2 6.91 306 CLEAR, NO ODOR 1027 4 2.6 73.2 6.89 304 CLEAR, NO ODOR 1028 5 3.3 73.2 6.87 305 CLEAR, NO ODOR 1035 MW-10 SAMPLE pH CALiBR~TION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 ~H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/~MHOS / GM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPEED AT 16.40 FT. FINAL DEPTH TO WATER 16.42 FT. 3 CASING VOLUMES = 4.5 GALS. kOTES: AquaGeosciences Inc ! · WATER QUALITY SAMPLING RECORD ~ Groundwater Scientists · Environmental Consultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 AMPLE ID OR WELL NO.: MW-11 DEPTH TO WATER: 18.22 PROJECT NO.: TOTAL DEPTH OF WELL: 26.58 PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 2" DATE: 8/16/95 CASING VOLUME: SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: PL ~,GE CHARACTERISTI CS SEC SAMPLE TEMP pH REMARKS (#mhos/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOL (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) DEPTH (GPM) (GAL) 'PUMPED NOT SAMPLED SAMPLE MW-1 lA IS REPRESENTATIVE OF BOTH MW-1 1 A-MW-1 1 pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 3H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/~MHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT FT. FINAL DEPTH TO WATER FT. 3 CASING VOLUMES = GALS. ~qOTES: AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD Groundwater,Scientists · Environmental Consultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~AMPLE ID OR WELL NO.: MW-1 lA DEPTH TO WATER: 17.50' PROJECT NO.: TOTAL DEPTH OF WELL: 63.84' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 8/16/95 CASING VOLUME: 27.72 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: PURGE PUMP PURGE CHARACTERISTICS SEC SAMPLE TEMP pH REMARKS (~mhos/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOL (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1336 DEPTH (GPM) (GAL) PUMPED 1344 20' 10 0.36 73.9 7.03 148 NO ODOR, CLEAR 1350 20 0.72 73.0 7.07 172 CLOUDY BROWN - NO ODOR 1358 30 1.08 73.0 6.95 176 NO ODOR, CLEAR 1406 40 1.44 72.7 6.92 175 NO ODOR, CLEAR  24' 50 1.80 72.6 6.91 176 NO ODOR, CLEAR 1428 60 2.16 72.6 6.87 172 NO ODOR, CLEAR 1438 70 2.42 72.6 6.90 171 NO ODOR, CLEAR 1446 80 2.80 72.5 6.92 170 NO ODOR, CLEAR 1450 85 3.00 1455 MW-1 lA pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 )H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 17.54 FT. FINAL DEPTH TO WATER 17.54 FT. 3 CASING VOLUMES: 83 GALS. ~NOTES: AquaGeo$cience$, Inc. WATER QUALITY SAMPLING RECORD '" Groundwater Sdentisl~ · Envi~om~ent~] Consu]tant~ AN D WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~AMPLE ID OR WELL NO.: MW-12 DEPTH TO WATER: 18.96 PROJECT NO.: TOTAL DEPTH OF WELL: 27.30 PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: Z" DATE: 8/16/95 CASING VOLUME: SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: ?I, II~GE CHARACTERISTICS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL. WELL VOL TEMP pH 0Jmhos/ CONTROL DEPTH (GPM) (GAL) PUMPED (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) NOT SAMPLED pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 ~H' 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT FT. FINAL DEPTH TO WATER FT. 3 CASING VOLUMES -- GALS. JNOTES: ^- ~ :~quaueoscze~ces, WATER QUALITY SAMPLING RECORD ~' GroundwaterSde~tists · F~v[ronmentalConsu]tants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~IIAMPLE ID OR WELL NO.: MW-12A DEPTH TO WATER: 17.61' PROJECT NO.: TOTAL DEPTH OF WELL: 63.36' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 6" DATE: 8/16/95 CASING VOLUME: 65.4 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: PURGE PUMP PURGE CHARACTERIST CS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL. WELL VOL TEMP pH ~mhos/ CONTROL DEPTH (GPM) (GAL) PUMPED (oC) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1540 20' 20 0.31 74.2 6.25 680 Cloudy Yellow, Strong Odor 1552 40 0.62 73.2 6.28 670 Clear Yellow, Strong Odor 1604 60 0.93 73.2 6.10 678 Clear, Moderate Odor 1616 80 1.22 73.4 6.14 668 Clear, Moderate Odor 1628 100 1.53 73.2 6.09 667 Clear, Moderate Odor 1640 120 1.84 73.2 6.12 670 Clear, Moderate Odor 1652 140 2.22 73.4 6.18 672 Clear, Mod. to Strong Odor 1700 160 2.44 73.2 6.15 670 Clear, Mod. to Strong Odor 1710 180 2.75 73.2 6.10 671 Clear, Mod. to Strong Odor 1720 200 3.05 73.2 6.14 671 Clear, Mod. to Strong Odor pH CALIBRATION / STANDARDIZATION MW-12A BUFFER SOLUTION pH 4.01 pH 7.0 pH 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/~MHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING AquaGeo$cience$, Inc. WATER QUALITY SAMPLING RECORD Groundwater Sde. l~t~ · Environmental Consultants AN D WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 DAMPLE ID OR WELL NO.: MW-13 DEPTH TO WATER: 19.46' pROJECT NO.: TOTAL DEPTH OF WELL: 48' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 8/15/95 CASING VOLUME: 17.07 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KV PURGE PUMP PL RGE CHARACTERISTICS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL. WELL VOL TEMP pH ~mhos/ CONTROL 1355 DEPTH (GPM) (GAL) PUMPED (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1400 10 0.51 76.8 7.07 202 YELLOW, SLT. ODOR 1403 20 1.02 73.9 7.56 208 YELLOW, SLT. ODOR 1405 30 1.53 73.9 7.39 220 CLEAR, SLT. ODOR 1408 40 2.34 73.8 7.34 224 CLEAR, SLT. ODOR 1411 50 2.90 73.8 7.27 229 CLEAR, SLT. ODOR 1414 55 3.20 73.8 7.24 233 CLEAR, SLT. ODOR 1420 MW-13 SAMPLE pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION i pH 4.01 pH 7.0 ::)H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 ' 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAA,IPLEDAT 19.46 FT. FINAL DEPTH TO WATER 19.46 FT. 3CASINGVOLUMES= 51.0 GALS. J~NOTES: AquaGeoscie ces, I c. WATER QUALITY SAMPLING RECORD '" Groundwater Sdentists · Environmental Consultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 ° Bakersfield, California 93313 I~)AMPLE ID OR WELL NO.: MW-14A DEPTH TO WATER: 18.86' PROJECT NO.: TOTAL DEPTH OF WELL: 62.50' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 8/15/95 CASING VOLUME: Z6.11 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: PURGE PUMP PU ~,GE CHARACTERISTICS SEC SAMPLE REMARKS TEMP pH (#mhos/ CONTROL TIME INTAKE RATE CUM. VOL. WELL VOl (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1050 DEPTH (GPM) (GAL) PUMPED 1059 10 0.38 76.1 7.74 21Z NO ODOR, CLEAR 1109 Z0 0.76 75.5 7.09 215 NO ODOR, CLEAR 1119 30 1.15 76.8 7.15 220 NO ODOR, CLEAR 1129 40 1.53 75.5 7.09 215 NO ODOR, CLEAR 1135 50 1.91 75.4 7.04 217 NO ODOR, CLEAR "~ 139 60 2.?9 75.3 7.08 216 NO ODOR, CLEAR 1144 70 2.68 75.3 7.05 217 NO ODOR, CLEAR 1150 80 3.06 75.3 7.04 Z18 NO ODOR, CLEAR 1155 4W-14A pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 oH 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLE_OAT 18.86 FT. FINAL DEPTH TO WATER 18.86 FT. 3CASINGVOLUMES= 78.34 GALS. I~NOTES: ~- '~ -'~quabeosoences, Inc. WATER QUALITY SAMPLING RECORD ~' C,ounawaterSde.~ts · En~o. mentai ConsuJ~aats AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, Cali~ornia 93313 i~AMPLE ID OR WELL NO.: MW-15 DEPTH TO WATER: 18.92' PROJECT NO.: TOTAL DEPTH OF WELL: 48.50' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 8/15/95 CASING VOLUME: 17.7 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KV PURGE PUMP PU F~GE CHARACTERISTI CS SEC SAMPLE REMARKS TIME INTAKE RATE CUM. VOL. WELL VOL TEMP pH ~mhos/ CONTROL 1310 )EPTH (GPM) (GAL) PUMPED (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1315 28" 10 0.56 74.5 7.53 298 CLEAR - NO ODOR 1318 20 1.13 74.0 7.25 310 CLEAR - NO ODOR 1320 30 1.69 73.8 7.17 312 CLEAR - NO ODOR 1323 40 2.26 73.8 7.07 336 CLEAR - NO ODOR ~ ~1327 50 2.82 73.8 7.11 330 CLEAR - NO ODOR "'1330 55 3.10 73.8 7.10 329 CLEAR - NO ODOR 1335 MW-15 SAMPLE pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION pH 4.01 pH 7.0 ~H 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION pMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 18.92 FT. FINAL DEPTH TO WATER_18.92 FT. 3CASING VOLUMES= 53.0 GALS. !~ NOTES: AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD Groundwater Sdentists · Environmental Consultants AND WELL DEVELOPMENT DATA 4440 Grissom St. Suite 100 · Bakersfield, California 93313 ~AMPLE ID OR WELL NO.: MW-1 6 DEPTH TO WATER: 15.84' PROJECT NO.: TOTAL DEPTH OF WELL: 47.50' PROJECT NAME: DAVIES OIL COMPANY WELL DIAMETER: 4" DATE: 8/15/95 CASING VOLUME: 18.94 GAL SAMPLED BY: PATRICK MCCULLOUGH METHOD OF PURGING: KV PURGE PUMP PURGE CHARACTERISTICS SEC SAMPLE TEMP pH REMARKS TIME INTAKE RATE CUM. VOL.I WELL VOL (pmhos/ CONTROL 1432 DEPTH (GPM) (GAL) PUMPED (°C) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.) 1435 30" 10 0.52 73.0 7.32 145 CLOUDY - NO ODOR 1439 20 1.05 72.4 7.42 154 CLOUDY - NO ODOR 1442 30 1.57 72.4 7.40 159 CLEAR - NO ODOR 1444 40 2.10 72.4 7.30 168 CLEAR - NO ODOR 1448 50 2.62 72.4 7.22 203 CLEAR - NO ODOR 1452 60 3.16 72.4 7.22 147 CLEAR - NO ODOR 1455 ~W-16 SAMPLE pH CALIBRATION / STANDARDIZATION BUFFER SOLUTION ~H 4.01 pH 7.0 pH 10.0 TEMP °C INSTRUMENT READING SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION KCL SOLUTION/JMHOS / CM @ 25° C 74 718 1413 6868 58640 TEMP °C INSTRUMENT READING SAMPLED AT 1 5.84 FT. FINAL DEPTH TO WATER 15.86 FT. 3 CASING VOLUMES = S6.8 GALS. ~l NOTES: APPENDIX B Laboratory Reports and Chain of Custody Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1920 Client: Aqua Geosciences Project Name: Address: 4440 Grissom St. Suite 100 Matrix: CitylStatelZIP: Bakersfield, CA 93313 Analyst: Phone: (805) 836-8100 Date Received: FAX: (805) ~36~800 Date of Analysis: Attention: Pat McCullough Date of this Report: Sampled By: Pat McCullough Analysis Performed: BTEX by purge and trap (EPA Method 5030/~320) Davies Oil Company Aqueous KJm Dailey Aug 16, 1995 Aug 22, 1995 Aug 23, 1995 Lab Number: 95A752 95A753 95A754 95A755 95A756 Date Sampled: Aug 15, 19~5 Aug 16, 1995 Aug 16, 1905 Aug 16, 19~5 Aug 16, 1995 Sample Description: MVV-8 MVV-5 MVV-3 MW-lO MW-lA Units: ug/L ug/L ug/L ug/L ug/L Benzene: ND ND ND ND ND MDL: 5 5 5 5 5 Toluene: ND ND ND ND ND MDL: 5 5 5 5 5 Ethyl Benzene: ND ND ND ND ND MDL: 5 5 5 5 5 Total Xylenes: ND ND ND ND ND MDL: 5 5 5 5 5 MDL: Method Detection Limit- the least amount of analyte that can be detected and reported. ND: Not Detected- the analyte was present below the MDL and could not be detected and reported. NA: Not Analyzed- analysis for this analyte was not performed. Michael Riccomini Laboratory Director 4440 Gnssom St. Suite 100, Bakersfield, CA 93313 Phone: (SCb-) 836-8100 FAX: (805) 836-8800 Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1920 Client: .Aqua Geosciences Project Name: Davies Oil Company Address: -!-!..~3 Grissom St., Suite lCO Matrix: Aqueous City/State/ZIP: Bakersfield, CA 93313 Analyst: KJm Dailey Phone: (805) 836-81C0 Date Received: Aug 16, 1995 FAX: (805) 836-8800 Date of Analysis: Aug 22, 19~ Attention: Pat M¢Cullouglq Date of this Report: Aug 23, 1~ Sampled By: Pat M¢Cullough Analysis Performed: Total Petroleum Hydrocarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 Lab Number: 95A752 95A753 ~5A754 95A755 95A756 Date Sampled: Aug 15, 1995 Aug 16, 19~6 Aug 16, 1995 Aug 16, 1995 Aug 16, 1995 Sample Description: MW-8 MW-5 MW-3 MW-10 MW-lA Units: ug/L ug/L ug/L ug/L ug/L TPH as Gasoline: ND ND ND ND ND MDL: 50 50 50 50 50 TPH as Diesel: NA NA NA NA NA MDL: TRPH: NA NA NA NA NA MDL: MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riccomini Laboratory Director 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805)836-8100 FAX: (805)836-8800 Halcyon Laboratories, Inc. California Department of Health Services CertifiCate No. 1920 Client: Aqua Geosciences Address: 4440 Grissom St., Suite 100 City/State/ZIP: Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 Attention: Pat McCullough Sampled By: Pat McCullough Analysis Performed: Project Name: Davies Oil Company Matrix: Aqueous Analyst: Kim Dailey Date Received: Aug 16, 1995 Date of Analysis: Aug 22, 1995 Date of this Report: Aug 23, 1995 Total Petroleum Hydrocarbons (TPH) by Califomia LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 Lab Number: 95A747 95A748 '95A749 95A750 95A751 Date Sampled: Aug 15, 1~95 Aug 15, 1995 Aug 15, 1~5 Aug 15, 1995 Aug 15, 1995 Sample Description: MW-14A MW-15 MW-13 MW-16 MW-4 Units: ugJL ug/L ug/L ug/L ug/L TPH as Gasoline: ND ND ND ND ND MDL: 50 50 50 50 50 TPH as Diesel: NA NA NA NA NA MOL: TRPH: NA NA NA NA NA MDL: MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riocomini Laboratory Director 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 8368100 FAX: (805) 836-8800 Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1920 Client: Aqua Geosciences Project Name: Address: 4440 Grissom St. Suite 100 Matrix: City/State/ZIP: Bakersfield, CA 93313 Analyst: Phone: (805) 836-8100 Date Received: FAX: (805) 836-8800 Date of Analysis: Attention: Pat McCullough Date of this Report: Sampled By: Pat McCullough Analysis Performed: BTEX by purge and trap (EPA Method 5030/8020) Davies Oil Company Aqueous KJm Oailey Aug 16, 19c~ Aug 22, 1995 Aug 23, 1995 Lab Number: 95A747 95A748 95A749 95A750 95A751 Date Sampled: Aug 15, 199~ Aug 15, 19~ Aug 15, 1995 Aug 15, 19~ Aug 15, 19~ Sample Description: MW-14A MW-15 MW-13 MW-16 MW-4 Units: ug/L ug/L ug/L ug/L ug/L Benzene: ND ND ND ND ND MDL: 5 5 5 5 5 Toluene: ND ND ND ND ND MDL: 5 5 5 5 5 Ethyl Benzene: ND ND ND ND ND MDL: 5 5 5 5 5 TotalXylenes: ND ' ND ND ND ND MDL: 5 5 5 5 5 MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riccomini Laboratory Director '7!..'FJ Gdssom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 8,36-8100 FAX: (8C5) 836-8800 Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1920 Client: Aqua Geosciences Project Name: Davies Oil Company Address: 4440 Grissom St. Suite 100 Matrix: Aqueous City/State/ZIP: Bakersfield, CA {~313 Analyst: Kim Dailey Phone: (805) 836-81C0 Date Received: Aug 16, 1~5 FAX: (805) 836-88O0 Date of Analysis: Aug 22, 1995 Attention: Pat McCullough Date of this Report: Aug 23, 1995 Sampled By: Pat McCullough Analysis Performed: BTEX by purge and trap (EPA Method 5030/8020) Lab Number: 95A757 95A758 95A759 95A760 95A761 Date Sampled: Aug 16, 19~5 Aug 16, 1995 Aug 16, 1995 Aug 16, 1995 Aug 16, 1995 Sample Description: MW-1 MW-11A MW~2 MW-20 MW-12A Units: ug/L ug/L ug/L ug/L ug/L Benzene: ND ND ND ND ND MDL: 5 5 5 5 5 Toluene: ND ND ND ND ND MDL: 5 5 5 5 5 Ethyl Benzene: ND ND ND ND ND MDL: 5 5 5 5 5 Total Xylenes: ND ND 92 23 ND MDL: 5 5 5 5 5 MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. Michael Riccomini Laboratory Director -!,!,-10 Gdssom St. Suite 1C0, Bakersfield, CA 93313 Phone: (805) 8368100 FAX: (805) 836-8800 Halcyon Laboratories, Inc. California Department of Health Services Certificate No. 1920 Client: Aqua Geosciences, Inc. Project Name: Davies Oil Company Address: 4440 Grissom St., suite 100 Matrix: Aqueous City/State/ZIP: Bakersfield, CA 93313 Analyst: Klm Dailey Phone: (805) 836-8100 Date Received: Aug 16, 1995 FAX: (805) 836-8800 Date of Analysis: Aug 22, 1995 Attention: Pat McCullough Date of this Report: Aug 23, 1995 Sampled By: Pat McCullough Analysis Performed: Total Petroleum Hydrocarbons (TPH) by California LUFT Manual Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 Lab Number: 95A757 95A758 95A759 95A760 95A761 Date Sampled: Aug 16, 1995 Aug 16, 1995 Aug 16, 1995 Aug 15, 1995 Aug 16, 1995 Sample Description: MW-1 MW-11A MW-2 MW-20 MW-12A Units: ug/L ug/L ug/L ug/L ug/L TPHas Gasoline: ND ND 730 107 ND MDL: .50 50 50 50 50 TPH as Diesel: NA NA NA NA MDL: TRPH: NA NA NA NA MDL: NA NA MDL: ND: NA: Method Detection Limit- the least amount of analyte that can be detected and reported. Not Detected- the analyte was present below the MDL and could not be detected and reported. Not Analyzed- analysis for this analyte was not performed. ' I' i i ..\ ,t'¥ J~'""/ ~"~ Michael Riccomini Laboratory Director 4440 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800 CHAIN OF CUSTODY AND ANALYSIS REOUEST 4440 Grissom St. Suite 100, Bakersfield, CA 93313 (805) 836-8100 A 2 ANALYSES REQUESTED REMARKS CLIENT NAME (~¢-~ J'c,"c '7"..~ ¢, PROJECT NAME ~) ~ ,... ,'c a O,'/ ~__..o. I ADDRESS ~ PHONE PROJECT MANAGER ,,/~. ~ ~dt., //,-,~{~. FAX ~ SAMPLER NAME ?. ~ a ~ SAMPLE DATE/TIME SAMPLE IPTION, IDENTIFICATION a ~ SAMPLED Matrix, c0ntalner, etc... o~3J /DJ F // I~. , , - / l~ ~' /~o mUNOUISHED BY ~~ ~ ~~ate & time RELINOUISHED BY Date & tlmel s~e~u~E A~ ~NTED N~ME ?~ 7~ ~ ~ ~ ~7~ ~IONATURE AND P~INTED SIONATURE AND PRINTED NAME ~t ~ Pq ,/~ t~ SIONAIURE AND PRI~E0 NAME CHAIN OF CUSTODY AND ANALYSIS REQUEST 4440 Orissom St. Suite 100, Bakersfield, CA 93313 (805) 836-8100 ANALYSES REQUESTED REMARKS PROJECT NAME ..~,~ ~ ,'~_._f ~, ~ o -,.- ADDRE$8 PHONE PROJECT MANAGER o SAMPLER NAME SAMPLE DATE/TIME SAMPLE DESCRIPTION, IDENTIFICATION ~ 6AMPLED Matrix, cenlalner, ~NOUIBHED BY ~~ ~ ~atO ' tim. RELINOUIBHED BY DsI~ , limo S,ONATURE A~ PRINTED NAME/ /~ r~ "¢,~ /~ ~f~.~ SIGNATURE A~ PRINTED NAME ~?NAT~EAND PRINTED NAME _.. j