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Home My WebLink AboutUNDERGROUND TANK (3),JAMES, AICP; DIRECTOR ENVIRONMENTAL HEALTH SERVICES DEPARTMENT February 27, 1992 Michael A. Stahl ARCO OIL AND GAS COMPANY Western District P. O. Box 147 Bakersfield, CA 93302 SUBJECT: Groundwater Assessment Report, 4121 So. H Street, Bakersfield, CA Dear Mr. Stahl: As requested, this Department has reviewed the subject report prepared by Earth Systems Environmental, Inc. Based on the information provided, it is the posit~n of this office that n~o~0~ ifurther action is needed at this time~~' s recommended (:that t~he wel.~s_ b ~''---~P~lease be ~~L L;tA does not relieve you of any~~. /d liability under the California Health and Safety Code or Water code ~ for past, present, or future operations at the site. Further, it ~dges not relieve you of the responsibilit.y to clean-up existing, ~ .a~ditional or previously unidentified conditions at the site which '.' ~L~use or threaten to cause pollution or nuisance or otherwise pose · ~ _' a threat to water quality or public health. Additionally, be J advised that changes in the present and proposed use of the site may require further site characterization and mitigation activity.~/ If you have any questions regarding this matter, please contact Dolores Gough at (805) 861-3636. Dan Starkey, R.E.H.S. Interim Program. Manager Hazardous Materials Management Program DS:jg 2700 "M" STREET, SUITE 300 BAKERSFIELD, CALIFORNLA 93,301 PRIN'IT.D ON RECYCLE~ PAPER (806) 861-3636 FAX: (805) 861-34Z9 Category Activity Hours DateCode Code Description (10tbs) z/~/~ ~- R~,~.,.~ ,,-:,~-,~ / ,-,,'~ -,~ ,-~ ~. 7 / ~/~ ~ ~'~'~ ~'k ,~ /~.x~-, ~.s (/ 7-~.~/a.~ --L~ /v~,'e_~ ~ //ber~,~./o t~ Data Entered By: Date: ~=nv. Health 580 4113 135~=~,, ~J.a~ 5. ESE concluded that the concentrations found from MW-1 and MW-2 correspond to a regional problem observed in wells upgradient of the subject site. Based on the information provided, it is the position of this Department that no further characterization or remediation is necessary at this time. During ~this phase of the investigation, no source at the site has been identified to have impacted the groundwater.. Although this Department does not object to the abandonment of the wells, it is recommended that the wells be kept for possible monitoring in the future. This site is located in an area where there are potential contamination sources, such as underground storage tanks. If you have any questions regarding this matter, please contact Dolores Gough at (805) 861-3636, Extension 545. Chris Burger, R.E.H.S. Hazardous Materials Specialist IV Hazardous Materials Management Program CB:DG:ch cc: Mark Magargee, ESE gough~stahl.let DAVID PRICE [] ASSISTANT DIRECTOR ENVIRONMENTAL HEALTH SERVICES DEPARTMENT March 10, 1992 Michael A. Stahl ARCO OIL and GAS COMPANY Western District P.O. Box 147 Bakersfield, CA 93302 SUBJECT: Groundwater Assessment Report, 4121 So. "H" Street, Bakersfield, CA Dear Mr. Stahl: As requested, this Department has reviewed the February 14, 1992, Report of Groundwater Assessment prepared by Earth Systems Environmental, Inc., (ESE) for the subject site. Based on our review, the following are our understandings: Three groundwater wells were installed on site in January 1992. The wells were drilled to 185 feet below ground surface and were screened with 20 feet of 4-inch 0.02" slotted PVC casing. e In January 1992, the depth to groundwater was measured at approximately 167 feet in each of the wells. The groundwater flow direction is to the south southwest with a gradient of 0.03. e Groundwater samples were analyzed for oil and grease, halogenated and volatile aromatic hydrocarbons using EPA test methods 418.1, 601 and 602 respectively. Very low levels of volatile aromatic hydrocarbons were found in monitoring wells MW-1 and MW-2. Minute concentrations of chloroform and trihalomethanes were also found in MW-1. No halogenated and volatile aromatics above the minimum reporting level were detected in MW-3 (downgradient well). e Discussions between ESE and California Water Service Company personnel indicated the presence of volatile aromatics and other organic compounds from wells within a mile radius of the subject site. These wells were screened within the upper aquifer, same as the wells on the subject site. 2700 "M" STREET, SUITE 300 BAKERSFIELD, CALIFORNIA 9~01 (805) 861-3536 FAX: (805) 851-3429 Western. District:~:..' '~ . "i: "';'~' ........ ' '. Post Office Box 147 · · , · . Bakersfield; California 93302. Tej6~l~on~e.-~05~321 4000.~~,. .... ,..?: . . February 14, 1992 Mr. Dan Starkey Hazardous Materials Specialist Kern County Environmental Health Department 2700 "M" Street, Suite 300 Bakersfield, California 93301 Re: Groundwater Monitoring Wells South "H" Street Location Assessment Report Dear Mr. Starkey: Enclosed please find the Report of Groundwater Assessment for our South "H" Street property pursuant to Permit Numbers MW 0774-31, MW 0775-31 and MW 0776-31. The monitoring wells were installed PUrsuant to the agreement for sale of the property to document the condition of the groundwater at the time of the sale. Samples were collected and analyzed for TPH, halogenated hydrocarbons, and volatile aromatic hydrocarbons by EPA test methods 418.1, 601 and 602, respectively. As shown in the report and summarized in Table 1, page 8, the minute concentrations found in the samples do not exceed 1% of any State of California Primary Maximum Contaminant Level. Also, based on our conversations with the Regional Water Quality Control Board and California Water Service, our results are comparable to known upgradient and regional groundwater problems. Based on the test results from the monitoring wells, I request your authorization to abandon the wells after you have completed your review. A written response addressed to me regarding the Department's evaluation of this report is also requested. Any request for payment of fees associated with the review of this report should be sent to me at the letterhead address. Thank you for your cooperation in this matter.. If you. have any questions or need additional information, please don't hesitate to contact me at (805) 321- 4307. Sincerely, Michael A. Stahl Senior Environmental Coordinator ARCO Oil and Gas Company is a Division of Atlantic Richfield Company REPORT OF GROUNDWATER ASSESSMENT, AT THE ARCO OIL AND GAS COMPANY FORMER OFFICE AND MAINTENANCE FACILITY AT 4121 SOUTH H STREET BAKERSFIELD, CALIFORNIA Prepared by Earth Systems Environmental, Inc. 6701 McDivitt Drive, Suite B Bakersfield, CA 93313 February 14, 1992 Project No. EB-8010-3 REPORT OF GROUNDWATER ASSESSMENT, AT THE ARCO OIL AND GAS-COMPANY FORMER OFFICE AND MAINTENANCE FACILITY AT 4121 SOUTH H STREET BAKERSFIELD, CALIFORNIA TABLE OF CONTENTS 1.0 INTRODUCTION ............................................................................................................... 1 2.0 SITE 2.1 2.2 2.3 2.4 DESCRIPTION .......................................................................................................... 1 Site..~ .................................................................................................................... 1 Background ........................................................................................................ 2 Regional Geology and Hydrology .................................................................. 2 Regional Groundwater Contamination ......................................................... 3 3.0 GROUNDWATER ASSESSMENT ....................................................................................... 4 3.1 Drilling ............................................................................................................... 4 3.2 Groundwater Monitoring Well Completion ..................................................4 3.3 Well Development and Groundwater Sampling .......................................... 5 3.4 Chemical Analysis of Groundwater Samples ............................................... 6 4.0 RESULTS OF GROUNDWATER ASSESSMENT ................................................................. 6 4.1 Soil Conditions ................................................................................................... 6 4.2 Hydrology ........................................................................................................... 7 4.3 Analytical Results ............................................................................................. 7 5.0 SUMMARY AND CONCLUSIONS ..................................................................................... 8 6.0 CLOSURE .......................................................................................................................... 9 REFERENCES .............................................................................................................................. I 0 IAST OF APPENDICES APPENDIX A MONITORING WELL PERMITS APPENDIX B BORING LOGS APPENDIX C WELL DEVELOPMENT DATA SHEETS APPENDIX D WELL PURGING DATA SHEETS APPENDIX E ANALYTICAL REPORTS AND CHAIN OF CUSTODY Earth System Enwronmental ;;In A Member of The Earth Systems Group ,.. 6701 McDivitt Drive, Suite B · Bakersfield, CA 93313 February 14, 1992 ARCO Oil and Gas Company 4550 California Avenue Bakersfield California 93309 Attention' Mr. Mike Stahl Project No.: EB-8010-3 Doc. No.: 9201-EII2.RPT SUBJECT: REPORT OF GROUNDWATER ASSESSMENT, AT THE ARCO OIL GAS COMPANY FORMER OFFICE AND MAINTENANCE FACILITY 4121 SOUTH H STREET, BAKERSFIELD, CALIFORNIA 1.0 INTRODUCTION This report presents results of a groundwater assessment performed by Earth Systems Environmental, Inc. (ESE) of the groundwater at the above referenced site. This assessment was performed in order to comply with the terms of the property sales agreement. Figure I is a vicinity map showing the location of the site and Figure 2 is a site map showing the location of the groundwater monitoring wells installed during this assessment. Tasks completed to date include the drilling and completion of three groundwater monitoring wells, chemical analysis of groundwater samples, and data analysis. All site assessment methods employed are in accordance with regulations and guidelines set forth in CCR Title 23, Chapter 3, CCR Title 22, Chapter 30, Article 11, the CFR Title 29, Part 1910, Section 120, and CFR Tide 40, Parts 190-299, as well as accepted professional environmental/geotechnical engineering procedures and applicable Kern County regulations. 2.0 SITE DESCRIPTION 2.1 Site The site is located on the southwest corner of the intersection of White Lane and South H Street in the city of Bakersfield, California (see Figure 1). The site was formerly a maintenance facility for ARCO's Kern County operations. ARCO Oil and Oas Company 2.2 Ba.¢kground Earth Systems Environmental, Inc. was contracted by the ARCO Oil Gas Company to conduct an initial groundwater investigation of the first encountered aquifer beneath the subject property. In January, 1992 ESE prepared and submitted a Kern County Department of Environmental Health Services (KCDEHS) groundwater monitoring well permit application for the drilling and installation of three groundwater monitoring wells. The KCDEHS approved the applications on January 10, 1992. The permit is included as Appendix A to this report. A site health and safety plan was also prepared and implemented to cover all site activities. 2.3 Regional Geology and Hydrology Regional Geology: The site is located in the southern part of the Great Valley geomorphic province. The Great Valley is a north-south trending valley, approximately 400 miles long by 50 miles wide. Surface and groundWater in the San Joaquin Valley is derived predominantly from the Sierra Nevada mountain range to the east, and is transported by five major rivers, the southern most being the Kern River. The subject site is located approximately 5 miles south of the Kern River. The surface of the San Joaquin Valley is composed primarily of unconsolidated Pleistocene (1.6 million to 11,000 years ago) and Recent (11,000 years ago to the present) alluvial sediments. Beneath the alluvial sediments are older, predominantly lake bed deposits. These lie unconformably on Mio-Pliocene marine sediments which extent to crystalline basement at approximately 20,000 feet. Site Geology: Geologic deposits in the study area include Pleistocene alluvial sediments of the Kern River Formation, which form a homocline dipping gently to the. southwest. The deposits are alluvium consisting of poorly indurated and dissected tan deposits (CDMG, 1964). The depth to the regional unconfined aquifer is approximately 170 feet below surface grade beneath the site (Kern County Water Agency, Improvement District No. 4, 1990 Report on Water Conditions, February 1, 1991). However, perched ground water is known to exist 1/2 half to the east at a depth of 20 feet in the abandoned Kern River EB-8010-3 9201-E112.RPT ARCO Oil and Cma Company channel to the ancient Kern Lake Bed (Kern County Water Agency, 1990 Water Supply Report, May 1991), and is reported to exist at a depth of 30 feet at the gasoline service station/mini market located 1/2 mile south of the site along the west side of South H Street. However, various consultants, including ESE have advanced in excess of 30 soil borings on the subject property to a maximum depth of 91 feet below surface grade, and no perched groundwater has been observed beneath the subject property. 2.4 Regional Groundwater Contamination Municipal water supply wells operated by the California Water Service Company (CWSC), and located in an upgradient position from the subject property have detected the presence of several hazardous materials including the trihalomethanes: chloroform, and bromoform, the pesticides: dibromoehloromethane (DBCM), bromodichloromethane (BDCM), and 3,3' dichlorobenzidine (DCB), the halogenated hydrocarbons: tetrachloroethylene (PCE), and dichlorodifluoromethane (Freon 12), and the volatile aromatic hydrocarbons: benzene, toluene, ethylbenzene, and total xylenes. Mr. Ray Taylor of CWSC's headquarters in San Jose, California discussed with ESE personnel on February 3, 1992, the analytical data for each well within a one mile radius of the subject property.. PCE has been detected in CWSC Well No. 123-02 (SE 1'/4 of NE 1/4 of Section 13, T30S, R27E) screened within this upper aquifer, and located approximately 1/8 mile north of the subject property ever since chemical analysis was initiated for this substance in 1985 (See Figure 1). PCE has also been detected in CWSC Well No. 129-01 (NE 1/4 of NW 1/4 of Section 13, T30S, R27E) screened within this upper aquifer, and located approximately 1/2 mile northwest of the subject property, and in CWSC Well No. 114-01 (SE 1/4 of SE 1/4 of Section 12, T30S, R27E) screened within this upper aquifer, and located approximately 3/4 mile north of the subject property ever since chemical analysis was initiated for this substance in 1985. The volatile aromatics: benzene, toluene, ethylbenzene, and total xylenes have also been recently detected in December, 1991 in the CWSC Well No. 129-01 (NE 1/4 of NW 1/4 of Section 13, T30S, R27E) screened within this upper aquifer, and located approximately 1/2 mile northwest of the subject property. Trihalomethanes, including chloroform and bromoform which are associated with the chlorination of water have been detected in several CWSC wells within one mile upgradient of the subject property. EB-8010-3 9201-E112.RPT ARCO Oil and Cms Company 4 Gasoline hydrocarbons including the volatile aromatics have been reported in a perched water zone at a depth of 30 feet at the gasoline service station/mini market located. 1/2 mile south of the site along the west side of South H Street. This perched water zone is not known to extend under the subject property. 3.0 GROUNDWATER ASSESSMENT 3.1 Drilling. A total of three wells were drilled on January 14 through 17, 1992 within this phase of groundwater characterization (Figure 2). Drilling for all three wells was accomplished using a truck mounted percussion hammer drill rig operated by Water Development Corporation and equiped with a dual walled casing. The three wells were drilled to a depth of 185 feet below surface grade. Groundwater was encountered during drilling at a depth of approximately 168 feet in each of the wells. A California Registered geologist was on-site to log the wells in accordance with the Unified Soil Classification System, and construct the monitoring wells. Appendix B contains copies of the well logs including the completion design. 3.2 Groundwater Monitoring Well Completion Three groundwater monitoring wells were installed to determine the potential presence of petroleum compounds in the underlying groundwater aquifer. The wells were constructed in accordance with the State of California Department of Water Resources Water Well Standards, Bulletins 74-81 and 74-90, as well as Kern County regulations. The wells were drilled to a depth of 185 feet below surface grade. The wells were cased with 20 feet of 4-inch 0.02" slotted PVC casing and /t3 filter pack sand, installed t¥om the bottom of the boring to 160 feet below surface grade. Blank PVC casing packed in a 3% bentonite, 7 sack neat cement grout extended from the surface downward to the five foot bentonite seal placed above the filter pack. Locking, water-tight well covers were set in concrete to protect and secure the well heads. EB-8010-3 9201-E112.RPT A CO Ott The effective depth of monitoring well MW-I has been limited to 171 feet due to the concrete grout filling the well screen below this depth. ESE has adjusted to well development and sampling protocols to account for the reduced effective depth. 3.3 Well Development and Groundwater Sampling Following completion of the groundwater monitoring wells, the wells were developed on January 20 through 22, 1992 by surging and bailing to remove drilling residues and produce low turbidity groundwater. All development, purging, and sampling equipment was washed TSP (tri-sodium phosphate) detergent, steam cleaned, rinsed with clean tap water and deionized water, then allowed to air dry before each well was purged and sampled, to reduce the possibility of cross-contamination. Prior to sampling, and 24 hours after well development, the groundwater monitoring wells were purged with a new pre-cleaned bailer to remove stagnant water in the wells. During purging, key parameters including temperature, conductivity, and pH were measured with a portable electronic meter and recorded. 'The meter had been calibrated prior to the sampling event. The purging continued until the monitored parameters stabilized after three casing volumes of groundwater had been removed. It should be noted that the pH and conductivity levels recorded in monitoring well MW-I reflect a stable shift because of the groundwaters proximity to the curing concrete .grout within the well screen. Mr. Rafael Leniz, Phd., chief chemist with BC laboratories assures ESE that the preservative added to the sample vials will continue to create an acidic pH in the water samples to inhibit microorganism population. The analytical results for the water sample from MW-I should not be affected by the proximity of the cement grout. The groundwater monitoring wells were sampled after water in the wells had recharged to approximately 80% of the original groundwater elevation. Data sheets for the well development and purging process are included as Appendixes C and D, respectively. Following purging, groundwater samples were collected on January 23, 1992 with new pre-cleaned disposable TeflonTM bailers, and discharged with a non-aerating bottom emptying device into sterilized glass containers, capped with TeflonTM septa, labeled, and chilled in an ice chest for transport. Water samples Were handled and transported according to the United States Environmental Protection Agency (USEPA) EB-8010-3 9201-E112.RPT ARCO Oil and Gas Company Febrmu'y-'. t4; 199-2 protocol to the DHS certified laboratory requested. Sample identification and chain of custody procedures were utilized to ensure sample integrity and to document sample possession from the time of collection to its ultimate disposal. The sample labels identified the job number, sampler, date, time of collection, and sample number unique to the sample. The monitoring wells were surveyed on January 24, 1992 from a designated point on the north side of the top of the well casing, and the groundwater levels were measured in each well to an accuracy of 0.01 feet. 3.4 Chemical Analysis Groundwater Samples Groundwater samples from the three monitoring Wells along with a travel blank and a field blank were sent to B.C. Laboratories, Bakersfield California. The water samples were analyzed for oil & grease, halogenated hydrocarbons, and volatile aromatic hydrocarbons by USEPA Test Methods 418.1, 601, and 602, respectively. 4.0 RESULTS OF GROUNDWATER ASSESSMENT 4.1 Subsurface Conditions Subsurface material encountered during drilling was alluvium to the total depth of each well. The alluvium was characterized by rust brown, silty and clayey sands (SM/SC) to a depth of approximately 15 feet. This is underlain by more permeable, tan, fine grained silty to well grade sand (SM/SW) to a depth of approximately 35 feet. Beneath this is an approximate five foot zone of low permeability, gray brown, good plasticity clay (CL). This is underlain by more permeable, rust brown, silty and clayey sands (SM/SC) to a depth of approximately 55 feet. Beneath this is an approximate ten foot zone of low permeability, brown, compacted silt (ML). This is underlain by more permeable, tan, fine grained silty to well grade sand (SM/SW) to a depth of approximately '75 feet. Which is underlain by brown, silty and clayey sands (SM/SC) to a depth of approximately 92 feet. Beneath this is an extensive interval of highly permeable, tan, fine grained silty sand (SM/SP) interbedded with thin, low permeability, brown, good plasticity clay lenses (CL) to a depth of 143 feet. The interval from 143 feet to 153 feet is moderately permeable, tan, fine grained silty sand (SM/SP) without the clay lenses. This is underlain by low permeability, gray brown, good plasticity clay (CL) to a depth of 165 feet. Underlying this to the deepest interval penetrated by the wells at 185 feet is high permeability, tan, well graded EB-8010- 3 9201 -E 112.RPT ARCO ~landGasCompany sand (SW). No perched groundwater was encountered during the drilling of 'these wells in the interval above the primary unconfined aquifer which was encountered at a depth of approximately 168 feet in each of the wells. 4.2 Hydrology On January 24, 1991 the relative elevations and locations of the north side of the top of casing of the three groundwater monitoring wells were surveyed. The top of casings have been referenced to an arbitrary elevation of 375" and are 375.675' at MW-l, 375.00' at MW-2, and 373.155' at MW~3. The depth to water in each of the wells was then measured to an accuracy of 0.01'. The recorded depths were -167.94' in MW- l, -167.54' in MW-2, and -167.53' in MW-3. The relative groundwater elevations are therefore, 207.735' at MW-I, 207.46' at MW-2, and 205.625' at MW-3. These groundwater elevations are presented on Figure 2 along with the resultant groundwater floW direction and gradient. The groundwater flow direction is to the south southwest with a gradient of approximately 0.3' per 100'. 4.3 Analytical Results-Groundwater Table I presents a summary of the analytical results for TPH as oil and grease, halogenated, and volatile aromatic hydrocarbons in water samples analyzed during the groundwater assessment. Total Petroleum Hydrocarbons (TPH) as oil and grease were detected in monitoring wells MW-l, MW-2, and MW-3 at concentrations of 1 mg/l, 2 mg/l, and 4 mg/l, respectively. Toluene was detected in MW-1 at 15.0 ug/l in an up gradient position to the subject property, and at 20.0 ug/l in MW-2. Total xylenes were detected in monitoring well MW-I at 0.5 ug/l, and in MW-2 at 6.0 ug/l. Ethylbenzene was detected in monitoring well MW-2 at 0.5 ug/1. Chloroform was detected in MW-1 at 1.0 ug/l, and 0.5 ug/l in the field blank arbitrarily designated as sample MW-2A. Total trihalomethanes were detected at 1.0 ug/l in MW-l, and 0.5 ug/l in the field blank designated MW-2A. Each of these trace concentrations is significantly below the State of California Primary Maximum Contamination Levels (MCLs) concentrations for groundwater. No halogenated, or volatile aromatic hydrocarbons were detected in MW-3 at the downgradient position on the subject property, or' in the trip blank EB-8010-3 9201-E 112.RPT ARCO Oil and (3as Company Febmn..'y. ~* 14~: 1992" prepared by the laboratory. Copies of the analytical reports and chain of custody document are included as Appendix E. TABLE 1. Analytical Results expressed in 'parts per billion, except for TPH as Oil & Grease expressed in parts per million. Oil Xylenes Benzene MW-1 1.0 110 1.0 15.0 0.5 ND MW-2 2.0 ND ND 20.0 6.0 0.5 MW-3 4.0 ND ND ND ND ND FB NA 0.5 0.5 ND ND ND TB NA ND ND ND ND ND MRL 1.0 0.5 0.5 0.5 0.5 0.5 MCL N/A 100.0 N/A 2~000.0 1~750.,0 680.0 ND: None Detected above Minimum Reporting Level (MRL). NA: Not Analyzed N/A: Not Applicable FB:.Field Blank TB: Travel Blank MCL: State of California Primary. Maximum Contaminant Levels. 5.0 SUMMARY AND CONCLUSIONS Based on the sampling and analysis, the groundwater sampled from the three monitoring wells on the subject property do not contain concentrations of halogenated, or volatile aromatic hydrocarbons in excess of the State of California Primary Maximum Contaminant Levels. Volatile aromatics Were detected at trace concentrations in both monitoring wells, MW-1 and, MW-2 positioned at upgradient locations on the property, but not in monitoring well, MW-3 positioned at a downgradient location on the property. The minute concentrations of volatile aromatics in the upgradient monitoring wells may be the result of an off-site source which has also been detected upgradient in CWSC Well No. 129-01 (NE 1/4 of NW 1/4 of Section 13, T30S, R27E) approximately 1/2 mile northwest of the subject property. These trace concentrations detected in monitoring wells MW-1 and MW-2 are interpreted to correspond to a regional groundwater problem observed in wells upgradient to the subject property. EB-8010- 3 9201 -E 112.RPT ARCO OilandO~sCompany 6.0 CLOSURE This report has been prepared for the exclusive use of ARCO Oil and Gas Company as it pertains to the referenced property in Bakersfield, California. The findings and conclusions rendered in this report are opinions based on laboratory testing of groundwater samples collected during this project and analytical data available from California Water Sevice Company through their monitoring of municipal water supply wells. This report does not reflect subsurface variations which may exist between sampling points. These variations cannot be anticipated nor can they be entirely accounted for even with exhaustive additional testing. All work has been performed in accordance with generally accepted practices in geotechnical/environmental engineering, engineering geology, and hydrogeology. No other warranty, either express or implied, is made. Thank you for this opportunity to have been of service. If you have any questions regarding this report or the information contained herein, please contact this office at your convenience. Sincerely, EARTH SYSTEMS ENVIRONMENTAL, INC. Mark R. Ma~argee,F/RC~ 4'~92 Senior Geologist CC; 3 Addressee 1 - SLO I -'BAK 4892 EB -8010-3 920 I-E112.RPT ARCO Oil and Gas Company ~0 REFERENCES California Division of Mines and Geology, 1964, Geologic Map of California, Bakersfield Sheet. Kern County Water Agency, 1990, Water Supply Report, September 1991. Kern County Water Agency, 1990, Report on Water Conditions-Improvement District No. 4, February 1991. California Water Quality Control Board-Central Valley Region, Compilation of Water Quality Goals, October 1990. Personnel Communication, Mr. Ray Taylor, California Water Service Company, February 3, 1992. EB -8010-3 9201 -El 12.RPT FIGURES IISIELI) WHITE LAN~ \ PANAMA Earth Systems Environmental, Inc. 6701 McDivitt Drive, Suite B Bakersfield. CA 93313 (805) 836-0901 FAX (805) 836-0911 TITLE Figure J08 NO. APPENDIX A MONITORING WELL PERMIT RANDALL L. ABBOTT DIRECTOR:, DAVID PRICE: 111 ASSISTANT DIRECTOR ~SOURCE' MANAG~OENC¥ ENVIRONMENTAL HEALTH SERVICES DEPARTMENT HAZARDOU8 MATERIALB MANAGEMENT PROGRAM MONITORING WELL(8) PERMIT PERMIT #: MW 0774-3~ MW 077~.3~ OWNER'S NAME: FACIUTY NAME: _A_[__co__Oil & Gu Company Arco South 'H' DATE: January lO, 199g FACIUTY LOCATION: 4121 South "H' Street, Bakersfield, CA DRILLING METHOD: Percu.~iorl Hammer CONTRACTOR: Wmer Develonment Corporation ENVIRONMENTAL CONTRACTOR_ Earth Systems Environmel~l TYPE OF MONITORING WF, LL($) Groundwatey NUMBER OF WELI.~ REQUIRED TO MONITOR FACILITY: Three 13) UCENSE NO,: 283~:~6 GENERAL CONDITIONS OF 'rill8 PERMIT: 1. Well si~e approval is required before beginning any week raided to welt construction, tt is unlawful to continue work past tile stag~ at which an Inspection is requirecl unlees inspection is WaNed or completed. 2. O~her requirecl Inspections include: conductor casing, all ~nnul~r seals, aJld final cor~truction features. 3. A phone call to zhe Oepa~ment office is required on trte morning of the d~y that work is to commence and 24 hours before zh~ placement of any Sadie or plugs. 4. Conslructlon under ffll~ Permit is subject m any instructions by Department representatives. 5. All wells constructed of PVC loc, ama at a contaminateO site where Oegraaation may occur must De destroyed after 2 years or prow no 0egraOation is occ~ring or has occurre0, 6. Any misrepresentation or noncompliance with required Permit Conditions or Ordinanoe wilt result In issuance of a 'STOP WOR~' ORDER.' 7. A copy of the Depa~ment of Water Resource~ Driller's Report, a~ well as copies of logs and water quality analyse~, muat 13~ subm~ecl to the Health Department within 14 days at, er completion of tlle work. 8. A well destruction application must be filed witt~ this Depa~mont It a well is being c~estroyed that Is not in conjunction with a test hol~ permit. 9. The petrni~ is void on the ninstiattl (90) calen~a~ day after (3ate of issuance if work has not been s~arted anti reasonable progre~ towel0 completion maOe. Fees axe not refunOaDle nor transferal3te. 10. I have read and agree to comply wilt1 the General Conditions noted above. SPECIAL CONDITIONS; 1. Approved Annutar Seat Depth ~60', This permit must be signect by either the contractor or owner. PERMIT'APPROVED BY: '1~:~1 Funk, Ha~Oous Materials Specialist CONTRACTOR'S SIONATUIR~ /~ DATE DATE: J,pflupw 10, 1992 LF: cas 2700 "M" STREET, SUTTE 30O BAKERSFIELD, CALIFORNIA 93301 \0774- 3!.. m~ (805) 861.3636 FAX: (805) 861.3429 APPENDIX B WELL LOGS WELL o co~Ru~oN ..-'0~ o:~..~ .,,",~ ,:~:' ~ s°~L ~sc~o~'._ I I I II ' I I I i I I I~ll i I I I I I I I i I I II ~_ i I ~z~ ~i _ _ I I t~ II ~X , ~ ,~ll - . ~ I I I -II ~ I I I II /' ~ I I ~ II -- ---- , I I I Ii I I I I I Ii I I t Ii ! I ~II ~ ''' ' I I ~/~ot' ~ r,.~ ~.-~,~, I .... I I I I ,'~; ~x~- ~ ~~ ~ G, o,:,~ ;?: ~ 0 C PLATE ~~ ~-//~ x ~ ~/~/ L O G o f. B O R I N G ~~-3 ,_,, APPENDIX C WELL DEVELOPMENT DATA SI4EE'Trs I ~ I I "SAMPLE ID ORWELL UO.: :~ ~-I PROJECT UO.; ~ 1ASK NO.: ~ 1OTAL DEPIH OF WELL:_/T/'~ PROJECT NAME: ~Rr* ~. ~ WELLDIAMEIER:. DATE:. {-~ -~ . CASING VOLUME:. SAMPLED BY: ~ ~A~T~ . . MEIltOD OF PURGING' ~/~ ~URGE CHARACTERIstICs - ~MP ~ Sic saar~E REMARKS 31ME IHIAKE ~A~ ~ rot ~[{tvot {'C) OEPIH (GPM) i~ j ruu~o C~I luo) (COLOR, II~RIDI~, ETC.] I ~o ~.8 L I~.~ rHC ~. t lB qA~O~ / S lA ~DAP, D~ AI~L,~ MODEL: 5:JFF~ 5OLU~Oll pH 4.C'I pH 70 pH 10.0 UNI1 ~,,~. 'c ~. ~ rlSlRUL~g~I ~EADIN~ ~.~ S~ECIt lC ELECTRICAL CONDUCIANCE. CA~B~A11Ot~ISIAIIDA~DI~OU ~,CL SOLUII~Nuu~I,eelcm~2S'C 74 71G 1413 ~8 58540 /~ ~slnb~l ~Dnig J lOgO 5AMrL[DAT I~~'~° ~. fltIALD~.PIII10~'AIE~J~'~R. :. ~'..m... .... ~.-.,z, ~'.....,.,.,.,..... .,........., ~i~'.' II SAMPLE ID OR WELL NO.: ~ ~-~ DEP~ TO WA1ER~' ." PROJECT UO.; ~10 1 ASK NO.: ~ I'OTAL DEPIH OF WEL[~?'/~' PROJECT NAME: ~o ~. H WElL DIAME1En: ~ DA~E:_ { ~ ~ - q ~ ,. CASING VOLUME: /[. SAMPLED BY: ~ ~ ~[Tt ~ MEIIIOD OF PURGING:. ~URGE CHARACTERISIIC~ ~MP ~ S~C ~ur~ REMARKS lIME INIAKE RA~ ~u rot ~[[t rot,(*C) (UHIIS) (UUllO~ ~(lllOt z:zq ,~.8 ~ {~.¢ 6.70 ~q~ ~.~~. CZ t lB qA~ON I Slgh'DARD~AItUN ~,~ODE L: ~~~ S'JF~ SOLuaON - pH4.Ol pH 7.0 pH 10.0 UNll ~ ~IS1RUMUII ~EADING ~.~ SPECIIIC ELECTRICALCONDLICIANCE-CALIB~AIlONI ~:CL SOLUIIuN umhom/tm ~ 25 ' C 74 71~ 1413 ~8 ~86t0 5AMrL[DAT J~' ~. FINAL~F. PllIIOWA1ER IDO'O~- 3CASINGVOLUMES-~'~.GALS. tIDeS: ......... E~rtl~ S ' ';n'mental Inc SAMPLE ID OR WELL I'~O.: ~l~,J - ~, PROJECTItO.: ~010 1ASK hlO.:__~,~ PROJECT NAME: A__~f-O 5'. H DATE- t-z-'z--~ %- SAMPLED BY: ~'URGE CHARACTERISllCS 'lIME DEPTH 1'O WAIER: )'~. ) ;5""3". 1OTAL DEPIH OF WELL: I~..~.' WELL DIAME1Eri: 4/" CA$11qG VOLUME:. //' MEIlIOD OF PURGING:. (COLOR. II~RIDITY, E..TC.) rH CAt IG q/~TION I S 1AIN DAP, DI'::,. A11L~hl I.~,ODEL: .~e~.,;'. 'c J~,-~ ~'- G SPECI! lC ELECTRICAL COhlPUC lANCE- CALIBfiAll0/I f $1AItDARDIZ.ATIOIi ICCL $OLUJlUN uml,oe I ~m ~ 2.5 ' C TEMP. *'C ~.~' S 1 r~ljt,q EJ 11 F[ EJ',DIt IO 5AMrLF_D AT l'~2.-f rT. I I I I 18.'~ _ I ! I ,J i~*~, J'itlALDI:.PIlIIOWA1ER I-lO'"z"! FT. ]CASIIIC_.¥OLUMES-_~-Z''.GALS. APPENDIX D WELL PURGING DATA SHEETS SAMPLE ID OR WELL NO.: _ ]V~VO- | DEPTH TO WAIER:,--,- PROJECTNO.;.~OID 1ASKNO.: -~ 1OTALDEPIHOFWELL: /T/" PROJECT HAME: /~_t_c~ _~. ~ WElL DIAMEIEn' ~/ DA'[E: ( ~- 2._~ - q '2_ _ CASIt,IG VOLUME: SAMPLED BY: -T'~ ~ /V~AR._'Tt ,',-) MEIltOD OF PURGING.' L I~ URGE CHARACTr-RIS 11C9 S~C . - TEMP PH REMARKS '~IMF IHIAKE RATE c"du rot ,,Itt rot (°C) (Ur/ITS) (UMIIO~, DEP'/H (GPI,I) (rul I ruU~FD CI~J I,o) (COLOR. IlI~BIDITY, SPECII lC: [LECTRIO^L CONDLIC1ANC[ -CAI. IBI~AIlOII I [;i^ItDA1RDIZATIOII ~:CL $OLUTIO1N u,nhoB I cm (_"~ 2~ 'C 74 71G 1413 f~r.,G8 S86~0 SAMrLEDAT [~/.(.e Itl'. 3CASIIIGVOLUMES--7"Z""" GALS. SAMPLE ID OR WELL NO.: ~ ~-~ DEPm TO ~AIER.-, PROJECT NO.: ~ol o 1AS~ NO.: Z 1OTAL OEPIH OF PROJECT HAME:, ~co ~. H WELL DIAMEIER:. DALE'. {- ~ - ~ ~ . CASING VOLUME: SAMPLED BY: ~1 ~ ~~ MEIltOD OF PURGING:,~. PURGE CHARACTERISIICS ~MP ~ s~c s~umt REMARKS ~IM~ IHIAKE RA~ ~u vol .Itt rot, (*C) (UfllIS~ (UMIIO~ DEPIH (GPM) (~ I ruu=~ ' C~J lu°l (COLOR, II~BIDI~.~TC.) S.o C t. L IB qA ~O~ I S I ~ NDARD~ A ]IL, t~ tJODEL: ~UFF~ 5OLU~Otl pH4.Ol pH 7.0 pH ~0.0 UNI] ~tlSIEUM~dl nEADIN~ ~,~ lO.~O SPECIIICELECT~IC~LCONDLIC1ANCE- LC - SOLUIIL)N umhos I~m ~ 25 ' C 74 IlG 1413 ~g 58~0 5IMrLEDAI /~_~. flNALDEPllIIOWA1ERIUo'~°,~. 3C~SU~GVOLUMES=~G~LS. SAMPLE ID OR WELL NO.: ~ ~lx ]- ~ DEP~ 3OWAIER: PROJECT NO.: ~/~ ,1ASKNO.: ~ 1OTALDEPIHOFWELL: / PROJECT HAME: ~rc~ ~. ~ WELLDIAMEIER:, PURGE CHARACTERISilc9 sFc - ~MP ~ REMARKS DEPIH (GPM) (~ } ~uu=~D C~; (~ml (COLOR. II~RIDI~, ~IC.) 5:JFF~SC)LU~OII pH4.Ol pHT.O j pHIC,.O UNIll 5PECItlCELECTRICALCONDUCiANCE-CA[IBSA]IONI KCL SOLUIIuN u,,,hom Icm ~ 25 * C 74 71~ 1413 ~4g Se640 APPENDIX E ANALYTICAL REPORTS AND CHAIN OF CUSTODY ENVIRONMENTAL. r-'~HEMICAL ANALYSIS PETROLEUM J. J. EGLIN, REG. CHEM. ENGR~ ' '4100 ATLAS CT., BAKERSFIELD, CAUFORNIA~93308. F~HONE (805)'327.~-~9~,1~ FAX'481)5)~ :327-1918 Purgeable Organic Analysis EARTH SYSTEMS ENVIRONMENT/~L 6701 MCDIVITT DRIVE, SUITE B BD/~ERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-3 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-1. SAMPLE WAS TAKEN ON 01-23-92 @ l:25PM BY TIM MARTIN. Test Method: EPA Method 601/602 Sample Matrix: Water Date Sample Collected: 01/23/92 Constituents Benzene Bromodichloromethane Bromoform Bromomethane Carbon tetrachloride Chlorobenzene Chloroethane 2-Chloroethylvinyl ether Chloroform Chloromethane Dibromochloromethane 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene Dichlorodifluoromethane 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (1,2-DCA) 1,1-Dichloroethene (1,1-DCE) trans-l,2-Dichloroethene 1,2-Dichloropropane cis-l,3-Dichloropropene trans-l,3-Dichloropropene Ethyl Benzene Methylene chloride 1,1,2,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1 Trichloroethane 1,1,2 Trichloroethane Trichloroethene Trichlorofluoromethane Date Sample Received @ Lab: 01/23/92 Date Analysis Completed: 01/28/92 Minimum Analysis Reporting Reporting Results Units Level None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected 1.0 None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected 15. None Detected None Detected None Detected None Detected ~g/L ~g/L ~g/L ~g/L xg/L ~g/L ~g/L ]g/L ~/L ~g/L ~g/L ~/L ~/L ~/L ~g/L ~g/L ~g/L ~g/L ~/L 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Printed on Environment 25 containing 100%~ reclaimed fibers with 15% Post-Consumer Waste ENVIRONMENTAL ~CHE¥1C,4L ANALYSIS PETROLEUM · ~. , 4100, ATLAS.CT., BAKERSFIELD, CALIFORNIA~93308:~.P.~NE!i(805)~327~11~(805)?327-1918~ Pur~e~le Orphic ~alysis '. ,. Page 2 EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BAKERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-3 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-1. SAMPLE WAS TAKEN ON 01-23-92 @ l:25PM BY TIM MARTIN. Constituents Minimum Analysis Reporting Reporting Results Units Level Vinyl chloride None Detected ~g/L 0.5 o-Xylene None Detected ~g/L 0.5 m- & p-Xylenes 0.5 ~g/L 0.5 Total Xylenes 0.5 ~g/L 0.5 Total Trihalomethanes 1.0 ~g/L 0.5 California D.O.H.S. Cert. ~1186 Department Supervisor Printed on Environment 25 containing 100% reclaimed fibers with 15% Post-Consumer Waste . ENVIRONMENTAL CHEMICAL ANALYSIS PETROLEUM' EARTH SYSTEMS ENVIRONMENTi~_L 6701 MCDIVITT DRIVE, SUITE B BAF~ERSFIELD, CA 93313 Attn.: MARK M~GARGEE 836-0901 Date Reported: Date Received: Laboratory No.: 0~/23/92 653-3 Sample Description: PROJECT: D~RCO S.H. PROJECT#: EB~8010-3. MW-1. SAMPLE WAS TD~EN ON 01-23-92 ~ l:25PM BY TIM MARTIN. Constituents Total Petroleum Hydrocarbons WATER ANALYSIS Results Units 1. mg/kg D.L.R. Method 1.0 EPA-418.1 D.L.R. = Detection Limit for Reporting purposes. REFERENCES: EPA = "Methods for Chemical D,nalysis of Water and Wastes" Department Supervisor , EPA-600, 14-79-020. Printed on Environment 25 containing 100%,= reclaimed fibers with 15% Post-Consumer Waste ENVIRONMENTAL, ~'CNEMICAL ANALYStS PETROLEUM , LABORATO J. J. EG[IN .... '. 4100' ATLAS, CT.,, BAKERSFIELD, CALIFORNIA Purgeable Organic Analysis EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BAKERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-4 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-2. SAMPLE WAS TAKEN ON 01-23-92 ~ 3:28PM BY TIM MARTIN. Test Method: EPA Method 601/602 Sample Matrix: Water Date Sample Collected: 01/23/92 Constituents Benzene Bromodichloromethane Bromoform Bromomethane Carbon tetrachloride Chlorobenzene Chloroethane 2-Chloroethylvinyl ether Chloroform Chloromethane Dibromochloromethane 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene Dichlorodifluoromethane 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (1,2-DCA) 1,1-Dichloroethene (1,1-DCE) trans-l,2-Dichloroethene 1,2-Dichloropropane cis-l,3-Dichloropropene trans-l,3-Dichloropropene Ethyl Benzene Methylene chloride 1,1,2,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1 Trichloroethane 1,1,2 Trichloroethane Trichloroethene Trichlorofluoromethane Date Sample Received ® Lab: 01/23/92 Date Analysis Completed: 01/28/92 Analysis Reporting Results Units None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected 0.5 None Detected None Detected None Detected 20. None Detected None Detected None Detected None Detected ~g/L ~g/L =g/L ~g/L ug/L ug/L ~g/L ~g/L ~g/L ~g/U ~g/n ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L Minimum Reporting Level 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 I~ Printeci on Environment 25 containing 100~: reclaimed fibers with 15% Post.Consumer Waste ~ENVIRONYENTAL CHEMICAL ANALYSIS PETROLEU¥ Purgeable Organic Analysis Page 2 EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BAKERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-4 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. 5gW-2. SAMPLE WAS T~kKEN ON 01-23-92 ~ 3:28PM BY TIM MARTIN. Constituents Minimum Analysis Reporting Reporting Results Units Level VinYl chloride None Detected ~g/L 0.5 o-Xylene 1.0 ~g/L 0.5 m- & p-Xylenes 5.0 ~g/L 0.5 Total Xylenes 6.0 ~g/L 0.5 Total Trihalomethanes None Detected ~g/L 0.5 California D.O.H.S. Cert. $1186 Department Supervisor Printed on Environment 25 containing 100~: reciaimeO fibers with 15% Post-Consumer Waste ~ ENVIRONMENTAL CHEMICAL ANALYSIS PETROLEUM I- BO ., 4100~ATLAS.CT~, BAKERSFIELD; EARTH SYSTEMS ENVIRONMENTDJ~ 6701 MCDIVITT DRIVE, SUITE.B BA/CERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 J. J. EGLIN,*:~ Date Reported: 01/27/92 Date Received: 01/23/92 Laboratory No.: 653-4 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-2. SD/~PLE WAS TILKEN ON 01-23-92 ® 3:28PM BY TIM MARTIN. WATER]~NALYSIS Constituents Results Units Total Petroleum Hydrocarbons 2. mg/kg D.L.R. Method 1.0 EPA-418.1 D.L.R. = Detection Limit for Reporting purposes. REFERENCES: EPA = "Methods for Chemical Analysis of Water and Wastes", Department Supervisor EPA-600, 14-79-020. Printed on Environment 25 containing 100% reclaimeO fibers with 1,5% Post-Consumer Waste ~> CHE¥1CA L ANALYSIS, Purgeable Organic Analysis EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BA/CERSFIELD, CA 93313 Attn.: M3%RK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-2 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-3. S~uMPLE WAS TA/(EN ON 01-23-92 ® I:15PM BY TIM MARTIN. Test Method: EPA Method 601/602 Sample Matrix: Water Date Sample Collected: 01/23/92 Constituents Benzene Bromodichloromethane Bromoform Bromomethane Carbon tetrachloride Chlorobenzene Chloroethane 2-Chloroethylvinyl ether Chloroform Chloromethane Dibromochloromethane 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene Dichlorodifluoromethane 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (1,2-DCA) 1,1-Dichloroethene (1,1-DCE) trans-l,2-Dichloroethene 1,2-Dichloropropane cis-l,3-Dichloropropene trans-l,3-Dichloropropene Ethyl Benzene Methylene chloride 1,1,2,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1 Trichloroethane 1,1,2 Trichloroethane Trichloroethene Trichlorofluoromethane Date Sample Received ® Lab: 01/23/92 Date Analysis Completed: 01/27/92 Analysis Reporting Results Units None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L =g/L ~g/L ~g/L Minimum Reporting Level 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Printed on Environment 25 containing 100% recla,med fibers with 15% Post-Consumer Waste ENVI~ON¥£NfA~L ': "~HE¥1C.4E ANALYSIS? :B.o 4100 ATLAS CT., BAKERSFIELD, Purgeable Organic .Analysis, EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BAKERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-2 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-3. SAMPLE WAS TAKEN ON 01-23-92 @ i:15PM BY TIM MARTIN. Constituents Minimum Analysis Reporting RepOrting Results Units Level Vinyl chloride None Detected ~g/L 0.5 o-Xylene None Detected ~g/L 0.5 m- & p-Xylenes None Detected ~g/L 0.5 Total Xylenes None Detected ~g/L 0.5 Total Trihalomethanes None Detected ~g/L 0.5 California D.O.H.S. Cert. ~1186 Department Supervisor Printed on Environment 25 containing 100% reclaimed fibers with 15% Post-Consumer Waste CHEtIICAL ANALYSIS PETROLEU¥ ~-. EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BAKERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 ~..41~!ATLAS:~:~;~;BAKERSF~EcDi~i~Ac~F~RN~A:~933~8)PH~E.~...~~~`~<~[~32~1916: Date Reported: 01/27/92 Date Received: Laboratory No.: 653-2 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-3. SAMPLE WAS TAKEN ON 01-23-92 ® i:15PM BY TIM MARTIN. Constituents Total Petroleum Hydrocarbons WATER ANALYSIS Results Units 4. mg/kg D.L.R. Method 1.0 EPA-418.1 D.L.R. = Detection Limit for Reporting purposes. REFERENCES: ~~emical Analysis of Water and Wastes". Department Supervisor , EPA-600, 14-79-020. Printed on Environment 25 containing 100% reclaimed fibers with 15~'c Post.Consumer Waste CHEMICAL ANALYSIS. PETROLEU¥ . BOR, Purgeable Organic Analysis EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BAKERSFIELD, CA. 93313 Attn.: MARKMAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-5 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-2A. SAMPLE WAS TA/~EN ON 01-23-92 ® 3:28PM BY TIM MARTIN. Test Method: EPA Method 601/602 Sample Matrix: Water Date Sample Collected: 01/23/92 Constituents Benzene Bromodichloromethane Bromoform Bromomethane Carbon tetrachloride Chlorobenzene Chloroethane 2-Chloroethylvinyl ether Chloroform Chloromethane Dibromochloromethane 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene Dichlorodifluoromethane 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (1,2-DCA) 1,1-Dichloroethene (1,1-DCE) trans-l,2-Dichloroethene 1,2-Dichloropropane cis-l,3-Dichloropropene trans-l,3-Dichloropropene Ethyl Benzene Methylene chloride 1,1,2,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1 Trichloroethane 1,1,2 Trichloroethane Trichloroethene Trichlorofluoromethane Date Sample Received ® Lab: 01/23/92 Date Analysis Completed: 01/28/92 Minimum Analysis Reporting Reporting Results Units Level None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected 0.5 None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Printed on Environment 25 containing 100% reclaimed fibers with 15°/. Post-Consumer Waste Purgeable Organic Analysis Page 2 EARTH SYSTEMS ENVIRONMENTAL 6701 MCDIVITT DRIVE, SUITE B BAKERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-5 Sample Description: PROJECT: ARCO S.H. PROJECT~: EB-8010-3. MW-2A. SAMPLE WAS TAKEN ON 01-23-92 ® 3:28PM BY TIM MARTIN. Constituents Minimum Analysis Reporting Reporting Results Units Level Vinyl chloride None Detected yg/L 0.5 o-Xylene None Detected ~g/L 0.5 m- & p-Xylenes None Detected #g/L 0.5 Total Xylenes None Detected ~g/L 0.5 Total Trihalomethanes 0.5 ~g/L 0.5 California D.O.H.S. Cert. #1186 Department Supervisor Printed on Environment 25 containing 100% reclaimeci fibers with 15% Post-Consumer Waste Purgeable Organic Analysis EARTH SYSTEMS ENVIRONMENTltL 6701 MCDIVITT DRIVE, SUITE B BD2CERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab #: 653-1TB Sample Description: PROJECT: ARCO S.H. PROJECT #: EB-8010-3 TRAVEL BLANK. TAKEN ON 01-23-92 ® 8:10AM BY TIM I~%RTIN. SAMPLE WAS Test Method: EPA Method 601/602 Sample Matrix: Water Date Sample Collected: 01/23/92 Constituents Benzene Bromodichloromethane Bromoform Bromomethane Carbon tetrachloride Chlorobenzene Chloroethane 2-Chloroethylvinyl ether Chloroform Chloromethane Dibromochloromethane 1,2-Dichlorobenzene - 1,3-Dichlorobenzene 1,4-Dichlorobenzene Dichlorodifluoromethane 1,1-Dichloroethane (1,1-DCA) 1,2-Dichloroethane (1,2-DCA) 1,1-Dichloroethene (1,1-DCE) trans-l,2-Dichloroethene 1,2-Dichloropropane cis-l,3-Dichloropropene trans-l,3-Dichloropropene Ethyl Benzene Methylene chloride 1,1,2,2-Tetrachloroethane Tetrachloroethene (PCE) Toluene 1,1,1 Trichloroethane 1,1,2 Trichloroethane Trichloroethene Trichlorofluoromethane Date Sample Received @ Lab: 01/23/92 Analysis Results None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected None Detected Date Analysis Completed: 01/27/92 Reporting Units ug/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L ~g/L =g/L =g/L ~g/L ~g/L =g/L ~g/L ~g/L ~g/L Minimum Reporting Level 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 ~) PrinteO on Environment 25 containing 100% reclaimed fibers with 15% Post-Consumer Waste EARTM SYSTEMS ENVIRO~NTAL 6701 MCDIVITT DRIVE, SUIT~ B BAKERSFIELD, CA 93313 Attn.: MARK MAGARGEE 836-0901 Date of Report: 01/28/92 Lab ~: 653-1TB Sample Description: PROJECT: ARCO S.H. PROJECT ~: EB-8010-3 TRAVEL BLANK. SA~/PLE WAS TAKEN ON 01-23-92 % 8:10AM BY TIM MARTIN. Constituents Minimum Analysis Reporting Reporting Results Units Level Vinyl chloride None Detected ~g/L 0.5 o-Xylene None Detected ~g/L 0.5 m- & p-Xylenes None Detected ~g/L 0.5 Total Xylenes None Detected ~g/L 0.5 Total Trihalomethanes None Detected ~g/L 0.5 California D.O.H.S. Cert. ~1186 Department Supervisor Printed on Environment 25 containing 100% reclaimed fibers with 15% Post-Consumer Waste Report To' &"'. _~. Phone: La~ Sample Description Date & Time Sampled Comment: Billing Info: RelinRuishe~ by: (Signature) L R~ City State A~ention: Miles: Relinquished by: (Signature) Received by: (Signature) P.O.~ Sample Disposal Received Relinquished by: (Signature) by: (Signature) D BC Disposal ~ Return to client ..... CLOSURE REPORT OF THE REMEDIATION OF SOILS IMPACTED WITH DIESEL HYDROCARBONS AT FORMER ARCO ()IL AND GAS COMPANY SITE 4121 SOUTH H STREET BAKERSFIELD, CALIFORNIA December 2, 1991 Prepared by Earth Systems Environmental, Inc. 6701 McDivitt Drive, Suite B Bakersfield, California 93313 (805) 836-0901 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 I0.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 TABLE OF CONTENTS INTRODUCTION ............................................................................................................... 1 HEALTH AND SAFETY PLAN ......................................................................................... 3 SOIL EXCAVATION .......................................................................................................... 4 EXCAVATION PIT FIELD SCREENING ............................................................................ 4 SOIL SAMPLE COl ~l JECTION .......................................................................... .~ ................. 5 LABORATORY ANALYSIS: EXCAVATION VERIFICATION SOIL SAMPLES ................ 5 ANALYTICAL RESULTS-EXCAVATION PIT .................................................................. 5 BACKFILL AND COMPACTION ....................................................................................... 6 CONSTRUCTION OF REMEDIATION CELL ....................................................................... 7 DESIGN, MANAGEMENT, AND MONITORING ...............................................................7 PROGRESS SOIL SAMPLING .......................................................................................... 7 LABORATORY ANALYSIS OF TREATED SOIL ............................................................... 8 ANALYTICAL RESULTS-TREATED SOIL ....................................................................... 8 CONFRIMATION SOIL SAMPLING ................................................................................. 9 CONFIRMATION LABORATORY ANALYSIS .................................................................. 9 CONFIRMATION ANALYTICAL RESULTS ..................................................................... 9 SOIL DISPOSITION .......................................................................................................... 10 CONCLUSIONS .................................................................................................................. 10 RECOMMENDATIONS ...................................................................................................... 11 CLOSURE .......................................................................................................................... ! 1 LIST OF APPENDICES APPENDIX A ANALYTICAL REPORTS AND CHAIN OF CUSTODY - EXCAVATION PIT APPENDIX B REPORT OF SOIL COMPACTION APPENDIX C ANALYTICAL REPORTS AND CHAIN OF CUSTODY - TREATED SOIL APPENDIX D ANALYTICAL REPORTS AND CHAIN OF CUSTODY - CONFIRMATION SAMPLF_3 Earth Systems Environmental'., Inc.-. A Member of The Earth Systems Group 6701 UcDiVitt E~?i~)e, s~ite a . Bakersfield, CA ~331~ ' (8~05) 836~09(~1~;,'' ~A~'i[l(~')::~:~:"~'l'l" :' .... December 2, 1991 Doc. No.: 911 I-E070.WP Project No.: EB-8010-1 Kern County Resources Management Agency Department of Environmental Health Services 2700 M Street, Suite 300 Bakersfield California 93301 Attention: Mr. Joe Canas SUBJECT: CLOSURE REPORT OF BIO-RECLAMATION OF SOILS CONTAINING SEMIVOLATILE PETROLEUM BASED COMPOUNDS FORMER ARCO SERVICE STATION, 4121 SOUTH 'I-I' STREET BAKERSFIELD, CALIFORNIA REFERENCE: PROGRESS REPORT OF BIO-RECLAMATION OF SOILS CONTAINING SEMIVOLATILE PETROLEUM BASED COMPOUNDS FORMER ARCO SERVICE STATION, 4121 SOUTH 'H' STREET BAKERSFIELD, CALIFORNIA (ESE, SEPTEMBER, 1991) REFERENCE: WORKPLAN FOR BIO-RECLAMATION OF SOILS CONTAINING SEMIVOLATILE PETROLEUM BASED COMPOUNDS FORMER ARCO SERVICE STATION. 4121 SOUTH 'H' STREET BAKERSFIELD, CALIFORNIA (ESE, JULY, 1991) REFERENCE: SITE ASSESSMENT REPORT., FORMER ARCO SERVICE, STATION, 4121 SOUTH 'H' STREET, BAKERSFIELD, CALIFORNIA (WILSON & ASSOCIATES, INC., JULY, 1990) Dear Mr. Canas: Earth Systems Environmental (ESE) has been contracted by Arco Oil and Gas Company to prepare this closure report of the soil remediation activities at the former Arco facility located at 4121 South H Street, Bakersfield, California (Figure I). These activities include the excavation and bio-reclamation of approximately 3,300 cubic-yards of soils impacted with semi-volatile petroleum based compounds believed to be diesel recently documented by Wilson & Associates in the above referenced report. 1.0 Introduction Following the Kern County Department of Environmental Health Serviee's (KCDEHS) conditional approval of the work plan, ESE conducted excavation of the impacted soil on August 5 though August 7, 1991. At. that time eight soil samples were collected from the base and sidewalls of the pit and analyzed for the presence of diesel and the fuel constituent volatile aromatics !o verify that no hazardous concentrations of these compounds remained in the subsurface. Upon receiving this confirmation, and with KCDEHS approval, the pit was backfilled with "clean" fill material, compacted and returned to surface grade. The excavated soil was placed as a one foot layer on an above ground treatment membrane constructed of visqueen plastic liner. · Treatment of the soil has consisted of enhancing indigenous soil microbes through the oxygenation effects of mechanical cultivation. On September 10, 1991 ten soil samples were collected from treatment cell and analyzed for the presence of diesel, and the fuel constituent volatile aromatics. The analytical results indicated that the mechanical cultivation had been highly successful in reducing the concentration of petroleum hydrocarbons. On October 25, ten additional soil 'samples were collected from the treatment cell in the presence of Mr. Joe Canas of the Kern County Department of Environmental Health Services. The analytical results indicated that no concentrations of diesel in excess of 40 mg/kg remain, and~uthe fuel constituent volatile aromatics can not be detected in the treated soil. pon review of the~ and with the approval of the County, ESE spread the soil on-site as laboratory reports grading fill to a thickness of less than two inches, and disassembled the treatment cell. ESE recommends that the site be considered for closure. In ESE's professional oppinion no addtional soil remains in the subsurface beneath the location of the former tank, product line, or dispenser which is impacted with diesel hydrocarbons at concentrations which pose a threat, to ground water or the public health. Additionally, the impacted soil has been excavated and treated by mechanical cultivation enhancing bioremedial processes so that no concentrations of diesel hydrocarbons in excess of 40 mg/kg remain in the treated soil. All methods employed by ESE for this remediation are in compliance with regulations and guidelines set forth in California Code of Regulations (CCR) Title 22, Article 11, and Title 23, Chapter 3, California Site Mitigation Decision Tree Manual, the Code of Federal Regulations (CFR) Title 29, Part 1910, Section 120, CFR Title 40, Pans 300-399, along with Kern County Department of Environmental Health Services EB-8010-1 9111-EO70.RPT Handbook #UT-35: "Site Characterization and Site Remediation", and Bay Area Air Quality Management District Regulation 8, Rules 40, and 47, which are considered to be policy guidelines by the San Joaquin Valley Unified Air Pollution Control District, Kern County Zone, as well as accepted professional environmental/geotechnical engineering procedures and applicable local regulations. The work plan employed by ESE to date to treat the diesel impacted soils has included: · Preparation of a site Health and Safety Plan in accordance with regulations set forth in Federal OSHA CFR 29 1910.120, as well as California OSHA regulations. · Excavation of approximately 3,300 cubic yards of impacted soil. · Confirmatory sampling and analysis of excavation pit base and sidewall. · Backfilling pit with "clean" import fill material, compacting, and returning to surface grade. · Construction and placement of impacted soil within a treatment cell. · Soil preparation and mechanical cultivation. · Progress monitoring and sampling. · Preparation of a progress report. · Preparation of this closure report. 2.0 Health & Safety Plan A written Health and Safety plan was be implemented for site work conducted during the mitigation phase of this project. The purpose of the plan was to provide specific safety procedures to be implemented during the handling of petroleum hydrocarbon contaminated materials. The Health and Safety Plan was required under regulations set forth in Federal OSHA CFR 29 1910.120, since the referenced reports documented the presence of potentially hazardous materials at the site. EB-8010-1 9111-E070.RPT 3.0 Soil Excavation Kern .Environmental Services provided front end loaders, and a self-elevating paddle wheel scraper to excavate the estimated 3,300 cubic yards of impacted soil at the site (Figure 2). Excavation was conducted on the days of August 5 through August 7, 1991. Prior to excavation, Underground Service Alert (USA) was notified 48 hours in advance. In addition, the excavation contractor obtained necessary excavation permits fi.om California Occupational Safety and Health Administration (Cai OSHA). Contaminated soils in the areas identified by the Wilson and Associates, Inc. Site Assessment Study dated July, 1990 were removed by excavating with front end loaders, and a self-elevating paddle wheel scraper. The contaminated soil was then placed in the remediation cell by a rubber tire front end loader. Excavating proceeded to a depth of 32 feet below surface grade (Figure 3). Excavation in the vicinity of borings TH-l, TH-2, and TH-4 was conducted to a depth of approximately 28 feet below surface grade. Excavation in the vicinity of boring TH-5 was conducted to approximately 23 feet below surface grade. Excavation in the 'vicinity of boring TH-6 was conducted to approximately 20 feet below surface grade. Excavation in the vicinity of boring TH-3 was conducted to approximately 15 feet below surface grade. Excavation in the vicinity of boring TH-7 was conducted to approximately 13 feet below surface grade. The estimated total volume of impacted soil removed was approximately 3,300 cubic yards (this includes partial mixing of clean material from sluff). The excavation was performed so that sidewall slopes conformed to California and Federal OSHA code requirements. 4.0 Excavation Pit Field Screening During excavation soil samples were collected from the base and sidewalls of the excavation pit and were visually screened for the presence of diesel. Excavation was continued in the areas of the former tanks, and dispensers until there was no evidence in the sidewalls and pit base of stained soils, or soils containing diesel odors. Integration of the final dimensions of the excavated pit with data collected from the previous site characterization at the property indicated that no concentrations of diesel in excess of 100 mg/kg should be remaining in the subsurface. Soil samples EB-8010-1 9111-E070.RPT were then collected under the direction of a KCDEHS representative from the boundaries of the excavation to verify satisfactory removal of the impacted soil. 5.0 Soil Sample Collection Eight verification soil samples were collected from the base and sidewalls of the excavation pit on the afternoon of August 7, 1991 at the locations shown on Figure 3. Four of the soil samples had been collected at a depth of 30 feet below surface grade, and the other four of the soil samples had been collected at a depth of 20 feet below surface grade. They were positioned to assess the concentrations remaining in the subsurface directly beneath the presumed release points at the fuel tank, product line, and dispenser, as well as providing information on the lateral concentrations from these release points remaining in the subsurface. The soil samples were collected in glass jars filled in such a way that no headspace remained, immediately sealed with a Teflon® lined cap, labeled, and placed on ice for transport to a California Department of Health Services (DOHS) certified laboratory. Strict chain of custody procedures were utilized for all samples collected to ensure sample integrity and to document sample possession from the time of collection to the final -destination. 6.0 Laboratory Analysis: Excavation Verification Soil Samples The eight soil samples were analyzed at Mobile Labs, Inc., a State of California certified laboratory for total petroleum hydrocarbons as diesel using the DOHS LUFT Method, and . for for the fuel constituent volatile aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX) by USEPA Method 8020. The analytical reports are included as Appendix A. 7.0 Analytical Results Excavation Pit All of the eight soil samples analyzed for the presence of TPH as diesel detected those hydrocarbons. Diesel was detected at concentrations ranging from 30 mg/kg to 10 mg/kg. None of the eight soil samples analyzed for the presence of the fuel constituent volatile aromatics detected any of those compounds at or above the minimum reporting level. EB-8010-1 9111-EO70.RPT Table 1 presents a summary of the analytical results' for TPH as die~l, and the gasoline constituent volatile aromatics in soil samples analyzed from the base and sidewalls of the excavation pit: TABLE 1. Analytical Results expressed in milligrams per kilogram. benzen'e[ Total Xylenes NW-1 '20' 20 ND ND ND ND NB-2 30' 30 ND ND ND ND SB-3 30' 10 ND ND ND ND SW-4 20' 20 ND ND ND ND NEW-5 30' 10 ND ND ND ND SEW-6 20' 30 ND ND ND ND NWW-7 20~ 20 ND ND ND ND SWW-8 30' 10 ND ND ND ND , A L NA 1~000 0.67 10.0 ,68.0 175.0 ND: None Detected at or above minimum reporting level. NA: Not Applicable A L: Regional Water Quality Control Board Action Level for contaminants in soft. Action Levels were calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality standards by a factor of 1,000 for diesel, and 100 for volatile aromatics to account for attenuation due to soil composition and distance from groundwater. 8.0 Backfill and Compactio,n Upon review of the laboratory results, and with the approval of the KCDEHS, the excavation pit resulting from soil removal was backfilled from August 9 through August 15, 1991 with "clean", over excavated soil, and enough import soil to replace the removed impacted soil. The source of the excess fill material was readily available at the subject property. The surface surrounding the excavation was landscaped to a depth not exceeding 2 inches and provided the needed fill material. The soil was compacted to 90% relative compaction in 12 inch lifts under the direction of an on-site soils engineer. Compaction tests were performed at two foot' intervals from the base of the excavation to 10 feet below surface grade, and in one foot intervals from 10 feet below surface grade to surface grade. Backfilling will be accomplished using an 815 mechanical compacter, a 966 loader, and a water truck. A report was prepared by the Earth Systems' civil engineering division which certifies EB-8010-1 9111-1~070.RPT Arco. Oil and Oas Company. 7 that the excavation was baekfilled in such a way that the compaction exceeds 90%. This report is included as Appendix B, and provides the compaction test reports as documentation. 9.0 Construction of Remediation Cell The contaminated soil excavated from the site was placed within a lined, impermeable cell, typical to the design of a landfill cell. In addition, all soil cuttings currently stored on-site, and produced from the characterization investigations, was incorporated into the treatment cell. Construction of the cell prevents fluids from seeping into underlying clean soils. The lining was over-lapped in a down slope direction at a minimum of 3 feet at the seams. A berm surrounding the cell was constructed to a minimum height of 3 feet and' width of 5 feet at the toe of slope. 10.0 Desien, Management, and Monitorine The bioremedial system utilizes active mechanical cultivation by a tractor and plow combination on a weekly basis. A significant decrease in the concentration of the petroleum hydrocarbons through aeration, and oxygenation was anticipated through the mechanical cultivation of petroleum hydrocarbons with the molecular weight of diesel. Field screening indicated that the bioremedial process was progressing successfully without the addition of nutrients or an inoculation of diesel degrading microorganisms. Therefore, no nutrient conditioning or microorganism inoculations were undertaken during the course of the bioremediation. 11.0 Pro~ress Soil Sampline The progress of the treatment has been monitored periodically by field screening for visual signs of staining, and diesel odors. Six composite soil samples were collected on September 11, 1991. Each of the six samples was composited from four discrete locations so that 24 locations are represented by the six samples. The samples were collected from the southwest quadrant, the northwest quadrant, the south central quadrant, the north central quadrant, the southeast quadrant, and the northeast quadrant. The soil samples were collected in glass jars filled in such a way that no headspace remained, immediately sealed with a Teflon® lined cap, labeled, and placed on ice for transport to a California Department of Health Services (DOHS) EB-8010-1 9111 -E070.RPT certified laboratory. Strict chain of custody procedures were utilized for all samPles collected to ensure sample integrity and to document sample possession from the time of collection to the final destination. 12.0 Laboratory Analysis of Treated Soil The six soil samples were analyzed at Mobile Labs, Inc., a State of California certified laboratory for total petroleum hydrocarbons as diesel using the DOHS LUFT Method, and for for the fuel constituent volatile aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX) by USEPA Method 8020. The analytical reports are included as Appendix C. 13.0 Analytical Results Treated Soil All of the six soil samples analyzed for the presence of TPH as diesel detected those hydrocarbons. Diesel was detected at concentrations ranging from 180 rog/kg to 30 mg/kg. None of the six soil samples analyzed for the presence of the fuel constituent volatile aromatics detected any of those compounds at or above the minimum reporting level. Table 2 presents a summary of the analytical results for TPH as diesel, and the gasoline constituent volatile aromatics in soil samples analyzed from the bioremedial treatment cell: TABLE 2. Analytical Results expressed in milligrams per kilogram. benzenel Xylene~ SW-I 120 ND ND ND ND NW-2 30 ND ND ND ND SC-3 180 ND ND ND ND NC-4 90 ND ND ND ND.. SE-5 110 ND ND ND ND NE-6 130 ND ND ND ND A L 1~000 0.67 10.0 68.0 175.0 ND: None Detected at or above minimum reposing level. *: exceeds current Action Level EB-8010-1 9111-EO70.RPT A~o Oil and (3~ Comp~my A L: Regional Water Quality Control Board Action Level for contaminants in soil. Action Levels were calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality standards by a factor of 1,000 for diesel, and 100 for volatile aromatics to account for attenuation due to soil composition ami distance from groundwater. 14.0 Confirmation Soil Sampling Mechanical cultivation continued to. be performed until that time when field screening no longer detected any volatile compounds using a PID, and no hydrocarbon staining or odors were observed throughout the treatment cell. On November 1, 1991 in the presence of Mr. Joe Canas of the Kern County Department of Environmental Health Services, fourteen soil samples were collected. Each of the fourteen samples was collected from discrete locations (Figure 4). The soil samples were collected in glass jars filled in such a way that no headspace remained, immediately sealed with a Teflon® lined cap, labeled, and placed on ice for transport to a California Department of Health Services (DOHS) certified laboratory. Strict chain of custody procedures were utilized for all samples collected to ensure sample integrity and to document sample possession from the time of collection to the final destination. 15.0 Confirmation Laboratory Anal~'si~. The fourteen soil samples were analyzed at Mobile Labs, Inc., a State of California certified laboratory for total petroleum hydrocarbons as diesel using the DOHS LUFT Method, and for for the fuel constituent volatile aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX) by USEPA Method 8020. The analytical reports are included as Appendix D. 16.0 Confirmation Analytical Results None of the fourteen soil samples analyzed for the presence of TPH as diesel detected these compounds in excess of 40 mg/kg, and the fuel constituent volatile aromatics were not detected any of the samples at or above the minimum reporting level. EB -8010-1 9111-E070.RPT Arco .Oil and-Oas Company 1 0 Table 3 presents a summary of the analytical results for TPH as diesel, and the fuel constituent volatile aromatics in soil samples analyzed from the bioremedial treatment cell: TABLE 3. Analytical Resuits expressed in milligrams per kilogram. benzene X~lenes NE-1 '10 ND ND ND ND SE-2 10 ND ND ND ND NCE-3 10 ND ND ND ND SCE-4 ND ND ND ND ND NEC-5 10 ND ND ND ND SEC-6 40 ND ND ND ND NWC-7 20 ND ND ND ND SWC-8 30 ND . ND ND ND NCW-9 10 ND ND ND ND SCW- 10 30 ND ND ND ND NW- 11 40 ND ND ND ND SW-12 20 ND ND ND ND NNW-13 10 ~ ND ND ND NNE-14 ND ND ND ND ND A L , 17000 0.67 10.0 , 68-0 175.0, ND: None Detected at or above minimum reporting level. A L: Regional Water Quality Control Board Action Level for contaminants in soil. Action Levols were calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality standards by a factor of 1,000 for diesel, and 100 for volatile aromatics to account for attenuation due to soil composition and distance from groundwater. 17.0 Soil Disposition Upon review of the laboratory reports and with the approval of the County, the "clean" treated was spread as grading fill to a maximum thickness of two inches on the subject property, and the treatment cell was decomissioned with the visqueen disposed of at the .municipal landfill. 18.0 Conclusion No soil with concentrations of petroleum hydrocarbons as diesel in excess of RWQCB Action Levels are known to exist in the subsurface at the location of the EB-8010-1 9111-EO70.RPT Arco Oil and Gas Company former fuel tanks, product lines, and dispensers. No additional soil mitigation is deemed to be necessary in that location. The bioremediation of the impacted soil through mechanical cultivation enhancing oxygenation has effectively reduced the concentration of diesel in the soil so that no concentrations in excess of 40 mg/kg, and no detectable concentrations of the fuel constituent volatile aromatics remain in the treated soil. 19.0 Recommendations ESE recommends that the site be considered for closure. In ESE's professional oppinion no addtional soil remains in the subsurface beneath the location of the former tank, product line, or dispenser which is impacted with diesel hydrocarbons at concentrations which pose a threat to ground water or the public health. Additionally, the impacted soil has been excavated and treated by mechanical cultivation enhancing bioremedial processes so that no concentrations of diesel hydrocarbons in excess of 40 mg/kg, and no detectable concentrations of the fuel constituent volatile aromatics remain in the treated soil. 20.0 Closure This report has been prepared for the exclusive use of Arco Oil and Gas Company as it pertains to the referenced property in Bakersfield, California. The findings and conclusions rendered in this report are opinions based on laboratory testing of soil samples collected during this project. This rep°rt does not reflect subsurface variations which may exist between sampling points. These variations cannot be anticipated nor can they be entirely accounted for even with exhaustive additional testing. All work has been performed in accordance with generally accepted practices in geotechnical/environmental engineering, engineering geology, and hydrogeology. No other warranty, either express or implied, is made. EB-8010-1 9111-E070.RPT Areo Ofl~amlG-a~.Comimny 12 Thank you for this opportunity to have been of service. If you.have any questions regarding this report or the information contained herein, please contact this .office at your convenience. Sincerely, EARTH SYSTEMS ENVIRONMENTAL, INC. Mark Magargee, ~G ~ 4892 Senior Geologist Distribution: 2/Addressee I/BAK File I/SLO File EB-8010-1 9111-E070.RPT FIGURES ~ilflchiWy. PANAMA Road BANd~E~FIELD Brook St WHITE LAN EAST PANAMA I E Figure Earth Systems Environmental, Inc.I 6701 McOivitt Drive, Suite B Bakersfield, CA 93313 . ~,o~ ,~-o~o~ I F~ (805) 836 0911 - ~/~/~/~/ / '~-~ I , .I Environmental, Inc. A Member of The EaCh Systems Group 67o~ ~cD~tt Dr,~e. S,~e B ~/~/ ~~ ~''~~ Bakersfield, CA 93313 ~~~~/ ~L/~. (805) 836-0901 JOB NO. , Earth Systems .~ TITLE ~ Figure I/ Environmental,Inc. I ,,'/.,~..,.., ,,'?.. ~-, .,,'".,,.-/% I .-, I 6701 McDivitt Drive, Suite a Bakersfield, CA 93313 (805) 836-0901 . -- - ' ~ ~0~ NO T££A T#flYI- C~'LL 6701 McDivitt Drive, Suite B .~,~'",~'/~'/~-,L.~) Bakersfield, CA 93313 (805) 836-0901 JOB NO. APPENDIX A ANALYTICAL REPORTS AND CHAIN OF CUSTODY - EXCAVATION PIT Nevada 5327 Wingfoot Drive Bakersfield, CA 93306 '(805) 872-4750 Laboratory Results For : Arco Facility 4121 South H Street Bakersfield, CA Sample Matrix ; Soils Date Received : 8/7/91 Date Analyzed : 8/8/91 Analyst : J.S. Johnson Lab No. 910113 Benzene Toluene Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg mg/kg mg/kg NW-1 ND ND ND ND 20 NB-2 ND ND ND ND 30 SB-3 ND ND ND ND 10 SW-4 ND ND ND ND 20 NEW-5 ND ND ND ND 10 SEW-6 ND ND ND ND 30 NWW-7 ND ND ND ND 20 SWW-8 ND ND ND ND 10 Ail Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 Analysis of Total Petroleum Hydrocarbons ; EPA 8015 Modified for Diesel Certificate Number : E739 Certified Full Service On-Site Analytical Laboratories ., · CALIFORNIA · NEVADA · ARIZONA 5327 WINGFOOT DRIVE BAKERSFIELD, CALIFORNIA 93306 (805) 87224750 CERTIFIED FULL ON SITE ANALYTICAL LABORATORIES PROJECT NO.: SITE NAME: SAMPLERS (SIGNATURE): SITE ADDRES~ ~ 0 ~AMPLE SAMPLE TIM~ C~P- GRAB MATRIX SAMPLE LOCATION DESIGNATION ID. NO. DATE : ' RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RECEIVED BY RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RECEIVED RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED FOR LABORATORY BY DATE TIME REMARKS: ", APPENDIX B REPORT OF SOIL COMPACTION 670~ McDIVI~ DRIVE, sUITE B · BAKERSFIELD, CA 93313 August 15, 1991 Job No. B-20380-BO:~ ':~ .... Mr. Mark Magargee Earth Systems Environmental,' Inc. 6701 McDivitt Drive, Suite B Bakersfield, California 95313 Subject: ESE Job #EB-8010-1 ARCO Property on White Lane Dear Mark: Submitted are the compaction test results performed during the backfilling of the hole resulting from the removal of unwanted soils Test results are being reported without .opinion or interpretation, in accordance with our agreement. No assertions or claims have been applied to the results. No reliance should be made on these results without interpretation by a registered engineer or other registered professional. If you have any questions, please contact this office. Respectfully submitted, BUENA ENGINEERS, INC. Area Manager Attach: a/s MW:RLH:bmh 2 - ESE 1 -Vta File 1 - Bkfld File VENTURA BAKERSFIELD (805) 642-6727 (805) 836-0611 Copies: PALMDALE SANTA BARBARA PALM SPRINGS f805) 948-7538 (805i 966-9912 {619) 345-1588 DATE AIL~O PRO~ OI WH~r~ LAIE l~R--80~0--I IIAK]~Slr]]3J). Cl~Pu (:K)UFI~o CAI-IFORi~A (~OllI~TSS~OIJ0_ B-20380-B0~ IlDX~T DIFI~ u&x~s ~ corr D~ Dlr~u (;Om) 8/12/91 1 2 .3 4 5 6 7 10 11 12 13 14 15 16 17 !8 Per Plan Per Plan Per Plan Per Plan Per Plan Retest of #3 Per Plan Per Plan Per Plan Per Plan Per Plan Per Plan Retest of. #10 Per Plan Per Plan Per Plan Per Plan Per Plan Per Plan Per Plan 20' BOG 15.1 106.3 118.0 90 20' BOG 13.1 112.6 118.0 96 27' BOG 33.1 91.6 118.0 78 29' BOG 13.9 107.9 118.0 91 27' BOG 13.8 113.2 118.0 96 25' BOG 11.6 109.6 118. O 93 23' BOG 11.8 109.2 118.0 93 21' .BOG 12.0 114. I 118.0 97 20' BOG 9.7 111.4 118.0 94 19' BOG 12. 5 103.1 118.0 87 19' BOG 12.4 1t2.7 118.0 95 17' B,~G 9 4 115.7 118.0 98 15' BOG 11.4 113.0 li8.0 95 13' BOG 10. 7 118.1 118.0 100 I1' BOG 11.1 113.4 118.0 96 11' b)G 10.8 !16.3 118.0 98 10' BOG 12.3 114.7 118.0 96 10' BOG 10.1 116.6 118.0 98 90 9O 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 19 Per Plan 20 Per Plan 21 Per Plan 22 Per Plan 23 Per P lan 24 Per Plan 25 Per Plan 26 Per Plan 27 Per Plan 28 Per Plan 29 Per Plan 30 Per P lan 31 Per Plan 9' BOG 9' BOG 8 BOG 8 BOG 7 BOG 6 BOG 5 BOG 4 BOG 9 BOG 3' BOG 2' BOG 1' BOG OG 7.5 8.8 8 8 11 0 9 3 10 4 9 2 13.8 8.7 14.5 i15.0 118.0 97 90 115.5 118.0 97 90 116.2 118.0 98 90 116.9 118.0 99 90 114.3 118.0 96 90 115.7 118.0 98 90 116.4 118.0 98 90 114.8 118.0 97 90 111.1 118.0 94 90 116.9 118.0 99 90 108.3 118.0 91 90 // Earth Systems Environmental, Inc. A Member of Tl~e E&rlh S¥~,tem~, G~oup 6701 McDivitt Drive, Suite B Bakersfield, CA 93313 (805) 836-0901 FAX (805) 836-0911 JOB NO. TITLE Figure APPENDIX C ANALYTICAL REPORTS AND CHAIN OF CUSTODY - TREATED SOIL 327 ,Wingfoot Drive . ;:.,.... ~.,;,:. ?. ;'"":';-i--. Laboratory Results For : ARCO Site 4121 South H Street Bakersfield, CA Sample Matrix ; Soils Date Received : 9/11/91 Date Analyzed : 9/15/91 Analyst : J S. Johnson Lab No. 910 39 Benzene. Toluene mg/kg mg/kg Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg 911-1 ND ND ND ND 120 911-2 ND ND ND ND 30 911-3 ND ND ND ND 180 911-4 ND ND ND ND 90 911-5 ND ND ND ND 110 911-6 ND ND ND ND 130 Ail Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 *Analysis of Total Petroleum Hydrocarbons ; EPA 8015 Modified for Diesel *The TPH Method for Diesel is the Calif DOHS Recommended Procedure Certificate Number : E739 !~/f(~L~'~h~(~s/On' Chemist Certified Full Service On-Site Analytical Laboratories · : ~i,, 5327WINGFOOT DRIVE CALIFORNIA · NEVADA · ARIZONA ; · BAKERSFIELD, CALIFORNIA 93306 :" (805) 872-4750 CERTIFIED ;ERVICE ON SITE ANALYTICAL LABORATOBiES -' SAMPLERS (SJ,GNATURE): ..~ SITE ADDRESS ~D ~i ~ ~ O ' :: ",~.-' SAMPLE TIME~I CSMP GRAB SAMPLE o . ID. NO. DATE MATRIX SAMPLE LOCATION DESIGNATION '~ - RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED FOR LABORATORY BY DATE TIME REMARKS: . APPENDIX D ANALYTICAL REPORTS AND CHAIN OF CUSTODY - CONFIRMATION SAMPLES Laboratory Results For : ARCO Facility 4121 sOuth H Street Bakersfield, CA Sample Matrix ; Soils Date! Recei'v'ed'.: '11/1/91 Date Analyzed : 11/7/91 Analyst : J.S. Johnson Lab No. 910162 Benzene Toluene Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg mg/kg mg/kg NE-1 ND ND ND ND 10 SE-2 ND ND ND ' ND 10 NCE-3 ND ND ND ND 10 SCE-4 ND ND ND ND ND NEC-5 ND ND ND ND 10 SEC-6 ND ND ND ND 40 NWC-7 ND ND ND ND 20 QA/QC Sample % Recovery 82 91 78 93 101 Diesel All Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 *Analysis of Total Petroleum Hydrocarbons ; EPA 8015 Modified for Diesel *The TPH Method for Diesel is the Calif DOHS Recommended Procedure Certificate Number : E739 Certified Full Service on-site Analytical Laboratories Laboratory Results For : ARCO Facility 4121 South H Street Bakersfield, CA Date Received : 1i/1/91 Date Analyzed : 11/7/91 Analyst : J.S. Johnson Lab No. 910162 Sample Matrix ; Soils Benzene Toluene Ethylbenzene X¥1enes Tot Pet Hyds mg/kg mg/kg mg/kg mg/kg mg/kg SWC-8 ND ND ND ND 30 NCW-9 ND ND ND ND 10 SCW-10 ND ND ND. ND 30 NW-11 ND ND ND ND 40 SW-12 ND ND ND ND 20 NNW-13 ND ND ND ND 10 NNE-14 ND ND ND ND ND QA/QC Sample % Recovery 73 86 77 85 94 Ail Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 *Analysis of Total Petroleum Hydrocarbons ; EPA 8015 Modified for Diesel *The TPH Method for Diesel is the Calif DOHS Recommended Procedure Certificate Number : E739 J.~'John~n, Che ' s~ Certified Full Service On-Site Analytical Laboratories ~RC~O.' Oil and Gas Company "' Western District Post Office Box 147 Bakersfield, California 93302 Telephone 805 321 4000 September 17, 1991 Mr. Joe Canas Hazardous Materials Specialist Kern County Environmental Health Department 2700 "M" Street, Suite 300 Bakersfield, California 93301 Dear Mr. Canas: Enclosed, please find a progress report for our South "H" Street project. The report includes details on the site excavation, verification sample collection and results, and the status of the soil remediation effort. As shown in the report, all verification samples collected from the bottom of the excavation are non-detectable for BTEX. and less than 30 mg/kg for TPH. Our consultant, Earth Systems Environmental, Inc., is proposing to continue with the remediation of the excavated soil for an additional month before collecting the final samples to document completion. You will be contacted in the near future to schedule collection of the samples. If you have any questions or need additional information, please don't hesitate to contact me at (805) 321-4307. Sincerely, Michael A. Stahl Senior Environmental Coordinator ARCO Oil and Gas Company ts a Division of Atlantic Rictnfield Company PROGRESS REPORT OF THE REMEDIATION OF :SOILS IMPACTED WITH DIESEL HYDROCARBONS ~T FORMER ARCO OIL AND GAS COMPANY SITE 4121 SOUTH H STREET ~]AKERSF~ ELD., CAL~ FORNIA ~arih :::,?em::~: Envi ronmen~al, Inc. 6701 ['.'izE)j~,,,~t Drive., :Suite 8' EJakersfieid., C:~lifornia 'gSS1 S (SOS) 8S6-0g01 ~.0 2.0 5.0 ~.0 7.0 i 4.0 ~5.0 6.0 TABLE OF CONTENTS INTRODUCTION ................................................................................................................. 1 HEALTH AND SAFETY PLAN ............................................................................................... 3 5;01L EXCAYATION .............................................................................................................. 3 E:×'.CAYATION PIT FIELD :.~ ..... EENING ........... 4 ::;01L SAMPLE COLLECTION ............................................................................................... 4 '"' ""'-" c I0 N .............................. LABOR~TORY ~NAL ..~..: EXC~Y~T ~.'Ct~'.! FiC~TION SOIL ..SAMPLES 4 ~N~LYTICAL RESULT~ ...................................................................................................... 5 o~L.~FIL~ AND L. UP F~L.~ ~L,N ............................................................................................ 5 CONSTRUCTION OF REMEDIATION CELL ........................................................................... 6 DESIGN, ?-!ANAGEMENT AND PIONITORINtS ...................................................................... 6 PR 3GRESS '501L .,~[ 1PLI NL, ............................................................................................. 6 LABORATORY ANALYSIS OF TREATED :bOl L ....................................................................... 7 ANALYTICAL RESULTS-TREATED ._,OIL ............................................................................. 7 L. ONCLJol UNS ................................................................................................................... 8 RECOMMENDATIONS ......................................................................................................... 8 C LOS b'"~: ~ PO~ ~~... ................... 8 LIST OF .APPENDICES APPENDIX A ANALYTICAL REPORTS AND CHAIN OF CUSTODY - EXCAVATION PiT ~PPENDI× B REPORT OF SOIL COMPACTION APPENDIX C ANALYTICAL REPORTS AND CHAIN OF CUE;TODY - TREATED SOIL Earth Systems Environmental-; l'nc!, . September 15, 1 991 Doc. No.: 9109-EO:~8.WP Project No.: EB-8010-1 Kern County Resources Management Agency Department of Environmental Health Services 2700 M Street, :Suite ;500 ~akersfield California 93301 ,Attention: t'4r. Joe Canas PROORESS REPORT OF BIO- RECLAMATION OF SOILS CONTAININE; SEMI¥OLATILE PETROLEUM _P, ASED COMPOUNDS '" "~ .~,~.,,~. 2~ SOUTH 'H' STREET FORMER ~RU~ SERYICE BAKERSFIELD. CALIFORNIA i?EFERENCE. ¥'/ORKF'LAN FOR ..'3!0-RECLAF"!ATiO?.~ .OF :~;01LS CONTA1NING :-3EI'll ~L, LMTI LE PETROLEUM ='"':'El:'. COMPOUNDS FORP1ER ARCO 5ER'¢!C.E STATION., ,~! .'2 ! SOUTH 'H' STREET · SAKERSF! EL[:,. C.~LI FORNI.A (. E $ E., J iJ L'Y'., i 99 ! ;, -':FE2F .... "' ..... A3:~ESSI'-'~.ENT REPORT FO~.~ME~:' ¢~.f-:CO :~,ER\,'ICE, :STATION, .... ' ~'-' :_¥F~:EFT. - ' '-= ..... -'~-1 ¢,. , T ~,'", s,~:=r , !, . Canas . Earth Systems Environmenta'I (ESE) nas been contracted by Arco Oil and Gas Company to prepare this progress report ,:,f the :.~oi! ren-,,edi,~tion activities at the former Arco facility !oc;sted L~t 41 21 5;outh H 5;treat.. 5~aker':;fi~!d., L-:a'tifoFnia (Figure 1). These activitie~ include the ~::,::cavation ;~nd bio- re,::iarnation of ;~,pro:;<i r~'t~(e! y S..500 cubic- yards of soils impacted with .semi-',.,'ola~ile petroleum based compounds be~ie'..,ed to ~e diesel recently documented by Wilson & ~:~soc.~es ~n the above rsfei"ence~ i _9 i DtroN~ctioD roi Towing the Kern County Oeoartment of Environmental Health Service's (KCDEHS) conditional approval c,f the work plan., ESE conducted excavation of the impacted soil on August 5 though August 7., !991. At that time eight ;~oil samples were collected from the bage and :sidewalls of the pit and analyzed flDr the presence of diesel and the fuel constituent volatile aromatics to verify that no hazardous concentrations of these~.comDounds remained in the subsurface. Upon receiving this confirmation, and ',,,,'ith KCDEHS approval, the Dit backfiiled with "clean" fill mater~al, compacted and returned to surface grade. Arco Oil' and Gas' Company 2 The excavated soil was placed as a one foot layer on an above ground treatment membrane constructed of visqueen plastic liner. Treatment of the soil has consisted of enhancing indigenous soil microbes through the o×ygenation effects of mechanical cultivation. On September 10, 1991 ten soil samples ',,/ere collected from treatment cell and analyzed for the preaence of diesel, and the fuel constituent volatile aromatics. The analytical reaults indicate that the mechanical cultivation has been highly successful in reducing the concentration of petroleum hydrocarbons. ESE recommends that the treatment continue for a period of one month. At that time a second round of samples should be collected from the treatment cell. If the results of the laboratory analysis indicate that the content, ration of diesel is less than 1 O0 rog/kg, then ESE ',,.'ill recommend that the soil be removed from the treatment cell, and spread as grading fill on the property at a thickness o.1'' tess than two inches. ESE will subsequently recommend that the site be considered for closure. ~I1 methods employed by ESE for ~his remediation are in compliance with regulations and ~'.:..uideti n~.s :set forth i n F:alifornia Code of R~,.~ui:~ions (CCR) Title 22, Article 11, and Title 23, Ck~apter 3, California Site Mitigation Decision Trse Manual, the Code of Federal Regulations ~;i~_-:F~i) Title £'.~, Part !910.. Section i SO. CFR Title 40, Parts 300-.599, along with Kern County ,":,apartment of Environmentai Health '..-';*..r',,'i cas Handbook #UT-.55: "Site Characterization :~nd :_:;itc Pemediation", and Bay ~r'ea Air- Qu;~lity ?ianagement District Regulation 8, Rules 40, .~nd 47.. :..¢'hich are considered to be policy ,.~uidetines by the San Joaquin Valley Unified Air Po!iuti,:n Control District, Kern Cot:nty Zone aa well as accepted professional eh,.,'1 ronmentai ,,'"9eotechnic:~! engi neeri n¢ procedures and applicable local regulations. T?~e work plan employed by F.'_:;E to date to treat the diesel impacted soils has included: Preparation of ;.~ site Health ,sr;d :'.;;;~i"~:.,t~;! °';;~n in ;~ccordance with regulations set forth in Feder~i OSHA CFR £9 t910. I '-20. ;.':s ',,..,'ell ..~s C;~lifornia OSHA regulations. E;.,.:ca',/ation of approxi matel y ~,500 cubic yards of impacted soil. Confi rmatory sampling and anal ysis of e::<.caYation pit.base and sidewall. Eiackfi~ing pit '..,/ith "clean" import fi!~ rn;~terial, compacting, and returning to surface gr'ade. Construction an,t placement of impacted s,:di ,,./ithi n a treatment cell. Soil preparation and mechanical EB-~010-1 9109-EO~8.RPT 't Arco Oil and Gas Company September?-l:.$;,::.l!'9~91~ · Progress monitoring and sampli ny. · Preparation of this progress t-aport. Z.O Health & Safetq, Plan ~ written Health and Safety plan ',.,,,'as be implemented for site work conducted during the mitigation phase of this project. The purpose of the plan was to provide :specific safety procedures to be implemented doting the h~ndling of .petroleum hydrocarbon contaminated ;nato, rials. The kleaith and 3afar .j Plan ,,,,,'as re,:uired under regulations set forth in Federal OSHA CFR 2? !910. I.20, since ~he rsferenced rsoor~s documented the presence of potentially h:~z,,.'..,,",~.o us mate ri al s 'at t he si ~e. ,,','~rn.... , Fr,',,'irr, nm~r~l :%rvi'~-::.... ~ .... ,--,,~.,, .~,j .... ~ .... , ,,.+ ,~n~ ...... loaders, :~nd a :::~lf-~le~'ating paddle ,-.,,~! .... .:~-.,-~r,~-... ~w.-., fn ................ m,:'r: y,,,,;?~ ~h~ e~::;~i rF'~d 3 . ......... ~...:.,,,.. ~:~r~;:. . Of ~ ~lDact~d. soil a~. the site (Figure "',-,,'~ .......... t~-;e. ' ' ,-,~ ' " ~ i ~. 1 ' ' · · ' " ,~-~-- .... · ::~r,.,~,-:. i.~;A) nciifie~ 48 hours in advance. ~ n .~di ti ,' n .. t he e::.:'.c;av~ti o n co r~t roi:to r o ~f ~i r~ed F~e,::es:s',s r y e':<c ~',,,' ~ti o npe r n-,i ts fro m Cali fo r ni a Contaminated soils in the ;srea::.; ~dentified bu the ",,',,'il:son and Associates., Inc. Site F~:sse:~:s)-ne nt Fit udu dated '~ ' ,JJlij ! ?:~l-i ',,~r'e rem:::ved h:, exc:)',~atirig ',,,/ith front end loaders, and a "" ~ "~ ..... " Oo]dl e .... -' .... ~ mr~] ':,,,,'r~eoi ::;-:F;~D~r ~.r,.~ r:nr~T3F~dF~;~ed :soil WaS then be placed in the ...........~-~ ~,n~ ~,~t~,',"- '. n ,;~l ..". '~,~.,,..~. :~,. ~-,,~ ~h~r .... *~re~. ~ T ?on'~' ' .~r,~' !..,.~,~,..~, . E:,::ce',.~ati ng proceeded to a depth of ~2 feet . ~:.:,:.:.::~,,,:~.,,'~:-, ~-, the ',,,'!Clrfity nf boring:]~ TH- i T~ .: and TH-4 ',.,.,'~s o:,nducted to ~ deE,~r, ,':,f .~ppro.:<~rn;~te~ /:'.~ feet ::.sic,',../ sur¢~c~' ,:r;~de. Excavation in the vicinity of boF~ng TH- 5 was ,::oRal Jcfed tc :~ppro::(imately 23 feet below surface gra~e. E'<:~,.'ati)nin the vicimty of borir,~ TH-6 was conducted to approximately 20 feet below surt~ce grade. Excavation in the ,,fisinity cf borin,~ TH-3 ',~,,'as conducted to approximately 15 feet below surface grade. Excavation i n the ,/ici nity of bari no TH- 7 was conducted to approximately 15 feet below surface grade. The estirr,~ted t)tal volume of impacted soil removed was approximately 5.500 cubic yards ~ .h~s incl~tdes partial mixing of clean material from slufO. EB-801 O- 1 9109-EO$$.RPT e. ~rco 0il and Gas Company 4 The excavation was performed so that sidewall slopes conformed to California and Federal OSHA code requirements. 4.0 Excavation Pit Field Screenin~l During excavation soil samples were coiiected from the base and sidewalls of the e×caYation pit and were visually screened for the presence of diesel. Excavation was continued in f. he areas of the former tanks., and dispensers until there was no evidence in the sidewalls and pit base of stained soils, or soils containing diesel odors. Integration of the final dimensions of the excavated pit with data collected from the previous site characterization at the property indicated that no concentrations of diesel in excess of' 100 rog/kg should be remaining in the subsurface. Soil samoies were then collected under the direction of a KCDEHS representative *.,'rom the boundaries of the e×cavation to '..,or, fy satisfactory removal of the impacted soil. 5.0 Soil ~amp. le Collection Fi,.~ht verification soil ~amples ',,,'ers collected from the base and sidewalls of the ~.xcavation pit on the afternoon .~f August 7.. i 991 at the locations shown on Figure ;5. Four of ~..*. so~l .samples had been coile, cted a~. a de~.h ..:,f' 30 fset below surface grade, and the other four of the soil samples had been collected a~ a depth of 2_0 feet below surface grade. They were positioned ,*.o assess the concentrations remaining in the subsurface directly beneath the presumed release points at the fuel tank, product line, and dispenser., as well as providing ~nformation on the lateral concentrations from these release points remaining in the subsurface. The soil samples were coliec~sd in Oiass jars filled in such a way that no headspace remai ned, i mmediatel y sealed with a T~.flon® li ned cap., labeled, and placed on ice for transport to a CatiS)rnia Department of Health ~.r¥~c~s (DOHS) certified laboratory. Strict chain of custody pC'ocedures ~,~ere ut. ilized for all samples collected to ensure sample integrity and to document 'sample possession from the ti me of coilsction to the fi nal desti nation. 6.0 Laboratory Analysis: Excavation Yerification Soil Samples The eight soil samples were analyzed at Mobile Labs, Inc., a State of California certified laboratory for total petroleum hydrocarbons as,2iesel using the DOHS LUFT Method, and for for the fuel constituent volatile aromatics benzene, toluene, ethyl benzene, and total xylenes (BTEX) by USEP6 Method 8020. The analytical reports are included as Appendix A. EEI-~O 1 O- 1 ~10<)-EO$8.RPT Arco Oil end Gas'Company September' 1'*:5;,? i'991, 7.0 Anaiqtical Results- Excavation Pit All of the eight soil samples analyzed for the presence of TPH as diesel detected those hydrocarbons. Diesel was detected at concentrations ranging from 50 rog/kg to 10 mg/kg. None of the eight 'soil samples analyzed for the presence of the f~Jel constituent volatile aromatics detected any of those compounds at or above the minimum reporting level. Table 1 presents a summary of the analytical results for TPH as diesel, and the gasoline constituent volatile aromatics in soil samples analyzed from the base and sidewalls of the excavation pit: TABLE 1. Analytical Results expressed in milligrams per kilogram. 3ample ' n NW- t Oeoth 2 O' 1 2 0 $$rlzene ND Toluene EthyL.- i benzene ND I ND N D ] N D N D ] N D Total X_yl e ND ND ND ;'ID ND ' N D N D r,~..n., i ND J ND ND ND ! ! i ,0 0 0 H 'C., ~ !,1 D i N D ,:,.67i o.oi 6s.o ND 75.0 .riD' None Detected at cr above rr, ir, ir~]urr~ repcrtinq ievei. NA: Not Applicable A L: Regionai ",',"ater Quality Control B,:,~rd A,: t~on Le'v'ei <:r contaminants in ~oil. Action Levels were ,:,.~icui.a~ed using ~he LUFT methodology by muliiplying ~he mos~ stringent curren~ federal or qualify standards bu .~ fao~,:,r of 1 .,000 tot u,e:..1, .and 100 for volatile aromatics to account for Upon r~viex,/ c,f the laborator~ results., end '?,,'ith the approval of !he KCDEHS, the excavation pit r~ulting from soil removal 'was backfilled from August 9 through ! 991 with ",:.'lean"., over excavated soil. and enough i rnpor~ soil to replace the removed impacted soil. The source of the excess fill material was readily avaiiable at the subject property. sur~aoe surrounding the excaYation ',,,'as !andscap~d fo a depth not exceeding 2 inches and provided the needed fill material. The soil ',,'ae compacted ~o 90% relative compaction inch lifts under thedirectiono~anon-site soils engineer. Compaction test~ were EB-801 O- 1 9109-EO:~8.RPT Arco Oil end Gas Company 6 two foot intervals from the base of the excavation to 10 feet below surface grade, and i n one foot intervals from 10 feet below surface grade to surface grade. Backfilling will be accomplished using an 815 mechanical compacter, a 966 loader, and a water truck. A report was prepared by the Earth Systems' civil engi neeri ng division '.#hich certifies that the excavation was backfilled in such a way that the compaction exceeds 90'~. This report is included as Appendix B, and provides the compaction test reports as documentation. 9.0 Construction of Remediation Cell The contaminated soil excavated from the site was placed within a lined, impermeable cell, typical to the design of a landfill cell. in .~ddition, all soil cuttings currently stored on- site, and produced from the characterization investigations, was incorporated into the treatment cell. Construction of the cell preventsflmd~~. from seeping into underlying clean .soils. The lining was over-lapped inadownslopedirectionata minimum of :5 feet at the seams. A berm surrounding the cell was constructed to a minimum height of 3 feet and width of 5 feet at the toe ~0.0 Desi~In_~ i~anagemen~, and The bioremediat system utilizes ~,:.tive mechanical cultivation by a tractor and plow combination on a weekly basis. A significant, decrease in the concentration of the petroleum hydrocarbons through aeration., and oxygenation can be expected through the mechanical cul~i'..,'a~ion of petroleum hydrocarbons '.,¢i~h the molecular weight of diesel. If it becomes ~pparent that only heavier molecular weioht hydrocarbons remain, and that to obtain the ~-squisite action levels., enhancing the bioiogical degradation is required, then the process of conditioning the soil with nutrients and ~....'.ster '...,.,'il! be undertaken. I i.O Progress Soil Sampling ~7~.~ @~O~O~]A[~ The progress of the treatmen~ ha~ been monitored periodicall'y by field 'screening for visual signs of staining, and diesel odors. Six composite soil samples were collected on :%ptember I I, 1991. Each of the six samples ',,..,',ss composited from four discrete locations so that 24 locations are represented by the si× :samples. The samples were collected from the southwest quadrant, the northwest quadrant, the south central quadrant, the north central quadrant., the southeast quadrant, and the nor(heast quadrant. The soil samples were collected in glass jars filled in such a way that no headspace remained, immediately sealed with a Teflon~ £B-801 O- 1 9109-E038.RPT Arco 0~1 ~nd G~s Company 7 li ned cap., labeled., and placed on ice for transport to a California Department of Health Services (DOHS) certified laboratory. Strict chain of custody procedures were utilized for all samples collected to ensure sample integrity and to 4ocument sample possession from the time of collection to the fi nal desti nation. lZ.O Laboratory Analysis of Treated Soil The si>.'. :soil samples were analyzed at Mobile Labs., Inc., a State of California certified laboratory for total petroleum hydrocarbons as diesel using the DOHS LUFT Method, and for for the fuel constituent Yolatiie aromatics benzene., icl uene., ethyl benz. ene., and total ×ylenes (BTEX) by i_iSEPA Method 80PO. The analytical reports are included as/~ppendi× C. Analytical Results - Treated Soil All. of the si,'< soil samples :~naly. zed for t. ne presence of TPH as diesel detected those hy,~rocarbons, Diesel ',,,,,'as jetecte,J at .-.,',ncerfrations ranging from I;30 mg/kg to 50 mg/kg. y ......... : ......... n .....the fuel constituent volatile aromatics NE- 6 -.hyl-I Total i benzene I X-ylenes :".J ..'.-.:, i N D '>! £:' i ,"'i D i ! N D i !'t £' ~ N D J ,."t D ' i0.n,_, ~ 68.0 ,I 175.0 O. 6 '7' NJ:,' N,:,ne '" ' '- * . . . · L..et~.O,.~u af or ab,',v¢, rninirnun-~ reporting level ~+: exc. eed?, c. urrent Ac:riCh LeYel A L' Re.~ional ",'¢.~ter Quality rontrol B,:,ard Act]Ch Level for ,s,:,nt.~minants in soil. Action Levels were e..~icuiated using the LUFT methodology by multiplying (l',e most stringen* current federal or state water quality .~t.~nd.~rds by a factcr ¢4' I .,000 for die~el...~nd 1 O0 fo~.'¢.ol.atile arornatics to account for attenua~.ion due to ~oil cornpo~i~.ion ~nd di~t.~nce from groun,!',#ater. EB-801 O- 1 9109-EO$8.RPT Arco 0~1 ~nd O~s Compeny 1 4.0 Conclusion No ~oil with concentrations of petroleum hydrocarbons as diesel in exces~ of R~QCB ~ction Levels are known to exist in the subsurface at the location of the former fuel tanks, PrOduct iines., and dispensers. No additionai ::~oii m~tigation is deemed ~o be necessary in that location. The bioremediation of the impacted soil through mechanical cultivation enhancing oxygenation has significantly reduced the concen'~ration of diesel in the soil. !5.0 Recommendations Treatment of the remaining ~mpacted :'.-.oil using mechanical cultivation should be continued for another period of one month. ~t that time ten additional soil samples should be ,::ollected to ,,.'er'ify that no concentrations of ,Jieset in excess of action levels remain in the treated soil. If t. he results of the laborator'....' ana!usis Yerif~es this, then ESE will recommend that the clean treated soil be used as grading ~'iil on tine subject property. The treated soil should be .-.': ~ read at a thickness of no greater than .~',,,,'o inches over the property. Upon successful completion of the treatment.. ESE wilt make a request for closure of the site. 16.0 Closure This report has been prepared for the exciusiYe use of Arco Oil and Gas Company as it ~ertains to the referenced property in Bakersfield, California. The findings and conclusions rendered in this report are opinions based on laboratory testing of soil samples collected during this project. This report does not reflect subsurface variations which may exist between sampling points. These variations cannot be anticipated nor can they be entirely accounted for e,..'en ,..~'ith exhaustiYe additional testing. A. 11 work has been performed in accordance with ~?.n~rai! y accepted practices i n geotechnicai ,."snvi ronmental engi neeri ny, engi neeri ng geology, and hydrogeology. No other warran~.y., either e.':..'.pr~tss or implied, is made. EB-801 O- I 9109-£055.RPT Arco Oil and'Gas Company ' September~-l:3;~?1}99 f ':~ ' Thank you for this opportunity to have been of service. If you have 'any questions regarding this report or the information contained herein, )lease contact this office at your CO nye Rie BCe. rice i'-el y, EARTH SYSTEMS ENYI RONMEHT~L, Mark P'iagargee., ';.'G~ 4~¢'9Z Senior L'~eol c, gi st ~, orr ,bution: '.';d ,,"~ J J r-e:ssee i/BAK File ~ ,,"'3 LO File EB-801 O-1 9109-EO~8.RPT. I ,~-~ ' I- I ~~ I Environmental, Inc. A MoOr ~ T~ E~flh 8y8~ ~ 6701 McDivi~ Drive, Suite B (8~) 836-~01 FAX (805) 836 0911 APPENDIX ANALYTICAL REPORT:~ AND CHAIN OF CUSTODY - EXCA'¢ATION PIT Nevada 5327 W~ngfoot Dr~ve Bakersf etd CA 93306 (805) 872-4750 Laboratory Results For : Arco Facility 4121 South H Street Bakersfield, CA Sample Matrix ; Soils Date Received : 8/7/91 Date Analyzed : 8/8/91 Analyst : J.S. Johnson Lab No. 910113 BenZene Toluene Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg mg/kg mg/kg NW-1 ND ND ND ND 20 NB-2 ND ND ND ND 30 SB-3 ND ND ND ND 10 SW-4 ND ND ND ND 20 NEW-5 ND ND ND ND 10 SEW-6 ND ND ND ND 30 NWW-7 ND ND ND ND 20 SWW-8 ND ND ND ND 10 Ail Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 Analysis of Total Petroleum Hydrocarbons ; EPA 8015 Modified for Diesel Certificate Number : E739 Certified Full Service On-Site.Analytical Laboratories .'. 5327WlNGFOOT DRIVE CALIFORNIA · NEVADA · ARIZONA BAKERSFIELD, CALIFORNIA 93306 (805) 872-4750 CERTIFIED FULL S ON SITE ANALYTICAL LABORATORIES SAMPLERS (SIGNATURE): SITE ADDRESS~' O SAMPLE TIM~/ -C~MP GRAB SAMPLE ~O. NO. DATE MATRIX SAMPLELOCAT~ONDES~GNAT~ON i RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RECEIVED BY (SIGNAT, URE) RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED FOR LABORATORY BY DATE TIME REMARKS: APPENDIX REPORT OF 5101L COMPACTION 6701 McDIVITT DRIVE, SUITE B · BAKERSFIELD, CA 93313 · (805) 836-0611 o' -, FAX'(805) 836-0911 August 15, 1991 Job No. B-20580-B01 Mr. Mark Magargee Earth 'Systems Environmental, Inc. 6701 McDivitt Drive, Suite B Bakersfield, California 93313 Subject: ESE Job #EB-8010-1 ARCO Property on White Lane Dear Mark: Submitted are the compaction test results performed during the backfilling of the hole resulting from the removal of unwanted soils Test results are being reported with°ut opinion or interpretation, in accordance with our agreement. No assertions or claims have been applied to the results. No reliance should be made on these results without interpretation by a registered engineer or other registered professional. If you' have any questions, please contact this office. Respectfully submitted, BUENA EN61NEERS, INC. Area Manager Attach'. a/s MW :RLH :bmh Copies: 2 - ESE 1 - Vta File 1 - Bkfld File VENTURA (805) 642-6727 BAKERSFIELD (805) 836-0611 PALMDALE SANTA BARBARA PALM SPRINGS (805) 948-7538 (805) 966-9912 {619) 345-1588 COllpAc'r~ol TKST EF...~llLTS COHH'rss'I'0I BO. B-20380-B01 I)&'I'K TEST BO. L0~&TIOi llox21'r Diet (;orr D~ D~ _c~_lgp 8/12/91 i Per Plan 20' BOG 2 Per Plan 20' BOG 3 Per Plan 27' BOG 4 Per Plan 29' BOG 5 Per Plan 27' BOG Retest of ~3 6 Per Plan 25' BOG 7 Per Plan 23' BOG 8 Per Plan 21' BOG 9 Per Plan 20' BOG 10 Per Plan 19' BOG 11 Per Plan 19' BOG Retest of ~10 12 Per Plan 17' BOG 13 Per Plan 15' BOG 14 Per Plan 13' BOG 15 Per Plan 11' BOG 16 Per Plan 11' BOG 17 Per Plan t0' BOG 18 Per Plan 10' BOG t5.1 t06.3 1t8.0 90 13.1 1/2.6 118.0 96 33.1 91.6 118.0 78 13.9 107.9 118.0 91 13.8 113.2 118.0 96 11.6 109.6 118.0 93 11.8 109.2 118.0 93 12.0 114.1 llB.O 97 9.7 111.4 118.0 94 12.5 103.1 118.0 87 12.4 112.7 118.0 95 9.4 115.7 118.0 98 tl.4 113.0 118.0 95 10.7 118.1 118.0 100 11.1 113.4 118.0 96 10.8 116.3 118.0 98 12.3 114,7 118.0 96 10.1 116.6 118.0 98 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 20 Per Plan 9" BOG 24 Pe~ Plan 5' DOG 22 P®~ Plan 8' BOG 23 Per Pi~ ?' ~G 2~ Per PI~ 6' ~G 25 Per Plan ~' ~G 26 Per PI~ 4' ~G 27 Per Pi~ 3' ~G 28 Per Pi~ 3' ~G 29 Per PI~ 2' ~G 30 Per Plan 1' ~G 31 Per Pl~ 0G 9.7 7.5 8.8 8.8 11.0 10.4. 9.3 10.4 9.2 13.8 8.7 14.5 1/5.0 115.5 116.2 116.9 114.3 1t5.7 116.4 114.8 ii%. 1 1t6.9 108.3 118.0 97' 118.0 97 t18.0 98 118.0 99 118.0 96 118.0 98 118.0 98 118.0 97 118.0 94 118.0 99 118.0 91 9O ~0 90 90 90 ~0 90 90 ~0 90 2 , \, x..___.~/ / Earth Systems I TITLE ! Figur. Environmental, Inc. i "3I '::'.,":.,':"cr"v~::'~" ! '~"' ~"-'"~..,.,-.-.~,.-~.-~.~~,~..'~'.'- i .v I ! APPE#DIX C ANALYTICAL REPORTS AND CHAIN OF CUSTODY - TREATED SOl L (805) 872-4750 Laboratory Results For : ARCO Site 4121 South B Street Bakersfield, CA Sample Matrix ; Soils Date Received-: 9/11/91 Date Analyzed : 9/15/91 Analyst : 3.S. 3ohnson Lab No. 910139 Benzene. Toluene mg/kg mg/kg Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg 911-1 ND ND ND ND 120 911-2 ND ND ND ND 30 911-3 ND ND ND ~, ND 180 911-4 ND ND ND ND 90 911-5 ND ND ND ND 110 911-6 ND ND ND ND 130 All Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 *Analysis of Total Petroleum Hydrocarbons ; EPA*8015 Modified for Diesel *The TPH Method for Diesel is the Calif DOHS Recommended Procedure Certificate Number : E739 --~'~~, Chemist Certified Full Service On-Site Analytical Laboratories 5327 WINGFOOT DRIVE BAKERSFIELD, CALIFORNIA 93306 CALIFORNIA · NEVADA · ARIZONA (805) 872-4750 CERTIFIED lICE ON SITE ANALYTICAL LABORATORIES 'SAMPLERS (SigNATURE): ~ SITE ADDRESS -- REMARKS SAMPLE ~ ~ '~ SAMPLE ID. NO. DATE TIME C~MP GRAB MATRIX SAMPLE LOCATION DESIGNATION R~LINQUI~HED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RECEIVED BY I I " RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RECEIVED BY (~i~ RECEIVED FOR LABORATORY BY DATE TIME REMARKS: RELINQUISHED BY: (SIGNATURE) DATE TIME (SIG~E)~ , WORK PLAN FOR REHEDIATION OF SOILS IHPACTED WITH DIESEL HYDROCARBONS AT FORPIER ARCO OIL AND GAS COPIPANY SITE 4121 SOUTH H STREET BAKERSFI ELD, CALl FORNIA Prepared by Earth Systems Environmental, Inc. 6701 McDivitt Drive, Suite B Bakersfield, California 95515 (805) 856-0901 Earth SYstems Environmental,. Inc',. A Member of The Earth Systems Group ,, , 6701 vc'Divitt Drive, Suite a · Bal~ersfield, CA 93313 * (~05) 836-0901 · FAX (8'0~)"83~;(~911 July lZ, 1991 Doc. No.: 9107-EO51.WP Project No.: EB -8010 - 1 Kern County Resources Management Agency Department of Environmental Health Services ZTO0 M Street, Suite 500 Bakersfield California 95501 Attention: Mr. Joe Canas SUBJECT: WORKPLAN FOR BIO- RECLAMATION OF SOl LS CONTAI NING SEMIVOLATILE PETROLEUM BASED COMPOUNDS FORMER ARCO SERVICE STATION, 4121 SOUTH 'H' STREET BAKERSFI ELD, CALl FORNIA REFERENCE: SITE ASSESSMENT REPORT., FORMER ARCO SERVICE, STATION, 4121 SOUTH 'H' STREET, BAKERSFIELD, CALIFORNIA (WI LSON & ASSOCIATES, INC., JULY, 1990) Dear Mr. Canas: Earth Systems Environmental (ESE) has been contracted by Arco Oil and Gas Company to prepare this work plan for soil remediation activities at tthe former Arco facility located at 41 21 South H Street, Bakersfield, California. ESE proposes excavation and bio-reclamation of approximately 5,500 cubic-yards of soils impacted with semi-volatile petroleum based compounds believed to be diesel recently documented by Wilson <% Associates in the above referenced report. After review of the available data, ESE believes the impacted soil can be treated on-site utilizing biological degradation technologies. The advantages of bio-reclamation is the permanent destruction of the petroleum hydrocarbons, thus minimizing the potential long term liabilities associated with off-site disposal at a hazardous waste facility. The final by-products of biologic degradation of the petroleum hydrocarbons consist pti maril y of carbon dioxide (C02) and water. We propose the construction of a bio- reclamation treatment system on-site as the most suitable method for mitigating the semi-volatile petroleum based compounds and reducing the concentrations of petroleum hydrocarbons within the soils at the above mentioned site to levels considered to be non-hazardous by Regional Water Quality Control Board Central Valley District, and Kern County Resources Management Agency, Department of Environmental Health Services' criteria. Following approval by Kern County Department of Environmental Health ~rco 41 21 South H Street 2 Services 8 biological treatment system will be implemented to treat impacted soils at the site. Upon successful completion of the biological treatment (reduction of total petroleum hydrocarbon concentration to below the acceptable li mits), and with the permission of the local governing regulatory agency, we will request that the treated soil be spread on-site as as grading fill. We anticipate the minimum time frame for successful treatment utilizing biological degradation capabilities to be on the order of 3 months. Based on our past experience with similar sites, we believe that the construction of an · above ground treatment cell would present the most cost effective and efficient method for remediating the impacted soil. The treatment system is based on enhancing indigenous soil microbes and/or the introduction of cultured specific strai ns of common microbes suited for the biological degradation of semi-volatile petroleum based hydrocarbons. All methods employed are in compliance with regulations and guidelines set forth in California Code of Regulations (CCR) Title ZZ, Article 1 I, and Title Z3, Chapter 3, California Site Mitigation Decision Tree Manual, the Code of Federal Regulations (CFR) Title 29, Part 1910, Section 120, CFR Title 40, Parts 300-399, along with Kern County Department of Environmental Health Services Handbook ~UT-35: "Site Characterization and Site Remediation", and Bay Area Air Quality Management District Regulation 8, Rules 40, and 47, which are considered to be policy guidelines by the San Joaquin Valley Unified Air Pollution Control District, Kern County Zone, as well as accepted professional environmental/geotechnical engi neeri ng procedures and applicable local regulations. Subject to your acceptance of this work plan, our plan to treat soils with bio- reclamation technology i ncl udes: Preparation of a site Health and Safety Plan ~n accordance with regulations set forth in Federal OSHA CFR Z9 1910.1ZO, as well as California OSHA regulations. Excavation of approxi matel y 3,300 cubic yards of impacted soil. Confirmatory sampling and anal ysis of excavation pit base and sidewall. Backfilling pit with "clean" import fill material, compacting, and returning to surface grade. Construction and placement of impacted soil within treatment cell. Soil preparation and inoculation with a commercially available cultured strain, or enhancement of indigenous soil microbes. EB-8010-1 9107-E031 .~P Arco 41 21 South H Street 3 ~July 1"2, 1 gg'l · Progress monitoring and sampling. · Preparation of a progress report. · Verification sampling and preparation of a final activities. report documenting remediation Subsequently we have developed the follovi ng scope of work: Health & Safety Plan A written Health and Safety plan will be implemented for site work conducted during the mitigation phase of this project. The purpose of the plan is to provide specific safety procedures to be implemented during the handling of petroleum hydrocarbon contaminated materials. The Health and Safety Plan is required under regulations set forth in Federal OSHA CFR ?9 1910.120, since the referenced report documented the presence of potentially hazardous materials at the site. This Health and Safety plan is included as Appendix A to the workplan. Soil Excavation Kern Environmental Services will provide front end loaders, and a self-elevating paddle wheel scraper to excavate the estimated $,300 cubic yards of impacted soil at the site. Based upon Regional Water Quality Control Board Action Levels, Kern County policy, and LUFT guidelines, ESE proposes an action level of 1..000 mg/kg for the maximum concentration of total petroleum hydrocarbons as diesel. Subsequent to the Kern County Resources Management Agency, Department of Environmental Health Services approval, soils will be excavated until the soils remaining in-place are believed to have concentrations of total petroleum hydrocarbons as diesel less than 1,000 rog/kg. .~,,.~.l,c ~-~'~,,- ~,-,j~-x/ .~ Prior to excavation, Underground Service Alert (USA) will be notified 48 hours in advance. In addition, the excavation contractor will obtain any necessary excavation permits from California Occupational Safety and Health Administration (Cal OSHA). Contaminated soils in the areas identified by the Wilson and Associates, Inc. Site Assessment Study dated July, 1990 will be removed by excavating with front end loaders, and a self-elevating paddle wheel scraper. The contaminated soil will then be placed in the remediation cell by a rubber tire front end loader. Excavating will Proceed to the to an esti mated depth of 32 feet below surface grade, or until concentrations are below the prescri bed EB-801 O- 1 9107-E031 .WP Arco 41 21 South H Street action levels in the vicinity of boring TH-4, 20 feet below surface grade in the vicinity of boring TH-l, 20 feet below surface grade in the vicinity of boring TH-2, end 15 feet below surface grade i n the vici nity of bom ng TH-5. The impacted soil and clean over excavation spoils will be segregated into two stockpiles. The esti meted total volume of impacted soil to be removed is approxi mately 5,500 cubic yards (this i ncludee partial mixi ng of clean material antic1 patad to be sluff). The excavation will be performed so that sidewall slopes conform to California and Federal OSHA code requirements. Mitigation of dust is an important concern during the excavation and positioning of soil during this project. Water trucks will be on-site to wet traffic paths to control all dust emissions. Excavation Air Emissions Volatile aromatic hydrocarbons may be emitted during the excavation and placement of the semi-volatile petroleum impacted soil at the site. However, a review of the available analytical data indicates that the profile of diesel hydrocarbons impacting the soil qualifies for an exemption to air emissions permitting as descri bed in the Bay 6rea 6ir Quality Management District Regulation 8 Rules 40, and 47, which are the guidelines used by the San Joaquin Valley Unified 6i r Poll ution Control District Kern County Zone. The tank removal operations by Pinnacle Environmental and the site characterization conducted by Wilson & 6ssociates collected and anal yzed 44 soil samples for the presence of total petroleum hydrocarbons as diesel, and the fuel constituent volatile aromatics benzene, toluene, ethylbenzene, and total xylenes. The volatile aromatics were non detected in :58 of the 44 samples. Benzene was detected in three of the samples at 1.0 rog/kg, in one sample at 0.19 rog/kg, and in two samples at 0.1 mg/kg. A mass balance calculation for the average concentration of benzene in the approximate :5,300 cubic yards that will be excavated and aerated is less than 0.05 rog/kg. 6ssumi ng that the enti re mass of benzene will volatilize in the first day of aeration, then less than 0.05 pounds of benzene will be emitted in that day. This is an overly conservative approach, since excavation will likely require ten working days. Because the emission of benzene for that day will be less than 0.05 pounds per day, the site qualifies for an exemption as described in Regulation 8 Rule 47 Section 109.2. These emission calculations have been provided as follows: EB-8010-1 cJ107-E031 .WP Arco 41 21 South H Street 5 July 12, ! 991 Benzene Emission Calculations Average Initial Concentration Benzene = 0.05 rog/kg Maxi mum Initial Concentration Be nze ne = 1.0 mg / kg Evaporation Rate $,;500 cubic yards/day = 89,1 O0 cubic feet/day Average Benzene Emission (89,1 O0 cu fi/day)/(:579.4 cu fi/lbs-mole = 254.85 lbs-mole/day (2;54.85 lbs-mole/day)*(O.05 ppm) = 0.000011 ? lbs-mole/day Molecular weight of benzene = 78 lbs/1 bs-mole (0.0000117lbs-mole/day)*(78 lbs/lbs-mole) = 0.00091 lbs/day Maxi m u m Be nze ne E mission (89,1 O0 cu ft/day)/(:579.4cu fi/lbs-mole = 254.85 lbs- mole/day (2:54.85 lbs-mole/day)*( 1.0 ppm) = 0.0002:55 lbs-mole/day Molecular weight of benzene = 78 1 bs/1 bs- mole (0.0002:55 lbs-mole/day)*(78 lbs/lbs-mole) = 0.018 lbs/day The methodology of the California Air Pollution Control Officers Association (CAPCOA) "Screening Level Risk Assessment" indicates that the maximum potential emission of 0.018 pounds of benzene over the duration of the project does not present a public health risk. The soil was impacted with a release of diesel fuel number Z. The boiling point of this fuel is approximately 400°F. Since the boiling point is greater than SOS°F, it is the :San Joaquin Valley Untied Air Pollution Control District, Kern County Zone's policy to grant an · exemption to Authority to Construct permiting consistent with the Bay Area Air Quality Management District's Regulation 8 Rule 40, Section 11;5. Therefore the entire ;5,;500 cubic yards of impacted soil may be excavated and placed onto the uncovered treatment pad during one continuous ti me period. Earth Systems Environmental believes that the excavation and bioremediation of this :5,500 cubic yards of diesel fuel number Z impacted soil does not present a public health risk. Excavation Pit Field Screenin. g During excavation soil samples will be collected from the base and sidewalls of the excavation pit, and will be screened for total organic vapors with a portable flame-ionization detector (FID). Headspace vapor analysis will be performed by filling a mason jar to 50~ EB-8010-1 9107-E031 .WP Arco 41 21 South H Street 6 capacity to produce a heed space all~ing volatilization for a period of 15 minutes, and protruding the probe of the FID through the cap end into the headspece for analysis. The FID readings ~i~ be recorded on the daily log. When field screening indicates concentrations less then 1,000 ppm, the excavation ~ill be d~sconfi hued. Otherwise excavation ~ill confi hue until field screening indicates concentration~ le~ than 1 ~000 ppm.. Contaminated soil ~i~ be removed untiI the soil~ remainin~ in place contain less than 1,000 rog/kg total petroleum hydrocarbons (TPH) as diesel, unless otherwise specified by the KCDEH~. This action level has been selected for the following reasons: the LUFT leaching potential maximum permissible concentration is 10,000 rog/kg for TPH as diesel, however it is ESE's experience that lending institutions will require a stricter guideline for property transfer financing. The current guideline is generally a maximum concentration of 1,000 rog/kg. ~oil grab samples ~ill be collected from the boundaries of the excavation to verify removal of the impacted soil. Soil Sam. ple Collection Following excavation ten verification soil samples will be collected from the base and sidewalls of the excavation pit. The soil samples will be collected in glass jars filled in such a way that no headspace remai ns, i mmediatel y sealed with a Teflon~ li ned cap, labeled, and placed on ice for transport to a California Department of Health Services (DOHS) certified laboratory. Strict chain of custody procedures will be utilized for all samples collected to ensure sample integrity and to document sample possession from the ti me of collection to the fi nal destination. Laboratory Anal ysis: Excavation Verification Soil Samples The ten soil samples will be analyzed for total petroleum hydrocarbons as diesel using the DOHS LUFT Method, and for benzene, toluene, ethylbenzene, and total xylenes (BTEX) by USEPA Method 8020. Bac kfi 11 a nd Co m pacti o n The excavation pit resulting from soil removal will be backfilled with the "clean", over excavated soil, and enough i report soil to replace the removed impacted soil. ESE proposes that a source of excess fill material at the subject property is readily available. The surface surrounding the excavation could be landscaped to a depth not to exceed 2 inches and would provide the needed fill material. This will be accomplished using a motor grader, and e peddle EB-8010-1 9107-E051 .WP Arco 41 21 South H Street 7 . Julu 12, 1991 wheel scraper. The soil removed from the landscaped area would eventually be replaced with the treated soil. The soil will be compacted to 90% relative compaction in 12 inch lifts under the direction of an on-site soils engineer, and certified by a Registered Civil Engineer. Compaction teats will be performed on each lift from the base of the excavation to surface. Backfilling will be accomplished using an 815 mechanical compacter, a 966 loader, and a water truck. A report will be prepared by the Earth Systems' Registered Civil Engineer which certifies that the excavation was backfilled in such a way that the compaction exceeds 90~, end provide the compaction test reports as documentation. Construction of Remediation Cell The contaminated soil excavated from the site will be placed within ali ned, impermeable cell, typical to the design of a landfill cell. In addition, all soil cuttings currently stored on- site, and produced from the characterization investigations, will be incorporated into the treatment cell. Construction of the cell will prevent any fluids from seeping into underlying clean soils. The cell will be sloped toward one edge at a minimum of 0.5~ to 1~ fall. The lining will be over-lapped in a down slope direction at a minimum of :5 feet at the seams. Construction of this type of cell will prevent any fluids from seeping into underlying clean soils and allow leachers collection along the down slope edge. The leachate collection system will i ncl uda a sump pump and soaker hose. The soaker hose will be placed over the top of the contami hated soil to be utilized for re-infiltration over the contaminated soil. A berm surrounding the cell will be constructed to a minimum height of 5 feet and width of 5 feet at the toe of slope. The slope may be constructed at 1'1 if the existing on-site material will maintain that slope. During the construction of the berms the impermeable li nar will draped over the berm and covered with an additional 8 to 1 Z inches of clean material. Once soils have been placed witbin the cell,..specific quantities of nutrients will be added, to enhance indigenous microbes or prepare the soil..f?r. i n'~U'i'~fion of'a cultured strain of microbes. The fi hal-by-products of biologic degradation of the petroleum hydrocarbons will consist primarily of carbon dioxide (C02) and water. We estimate · ~-the construction of the bioremediation treatment piles can be performed within the time frame "of approximately three days. We estimate that the following scope of work will result in satisfactory construction of the remediation cell: EB-8010-1 9107-E031 .WP ~rco 4121 Sour h H St rest 8 · Select and compact remediafion cell subgrade. · Construct harmed, lined remediation cell. · Remove and segregate debris (i.e. large concrete pieces, timbers, steel piping) not considered suitable for treatment in the bioremedisfion cell. · Transport contaminated material to remediation cell, nuttily, and inoculate, if deemed necessary. Design, Management, and Monitoring The system will be designed minimize the total treatment cost while obtaining a reasonable time frame for successful completion. The will likely consist of a water delivery system consisting of periodic watering with a sprinkler system to allow the infiltration of nutrient enriched water over the impacted soils, in combi nation with mechanical cultivation to maintain the necessary oxygen content for aerobic microbial degradation. Prelimi~nar&l__~~ conducted to determine the total indigenou~o.r~Of soil~t treatability testing be microbes, and those capable of degrading hydrocarbons, as well as posaibl~nhibitors microbial growth. Pending the results of the treatability study, it may be necessary to introduce a cultured strain of soil microbes, otherwise the system will be based on enhancing the indigenous soil microbes. It is important to note that the system envisioned to excavate and spread the impacted soil onto the treatment membrane will result in a significant decrease in the concentration of the petroleum hydrocarbons through aeration, and oxygenation. ESE proposes to initially allow the aeration process to conti hue as long as significant progress continues to be observed. This will be done through aggressive turning of the soil for a period of two weeks. When it becomes apparent that only heavier molecular weight hydrocarbons remain, and that to obtain the requisite action level, enhancing the biological degradation is required, then the process of conditioning the soil with nutrients and water will begin. Aeration of this volume of diesel impacted'soil is permissible under Bay Area Air Quality Management District's Regulation 8 Rules 40, and 47 which are used by the San Joaquin Valley Unified Air Pollution Control District, Kern County Zone, since the emission of benzene will be less than 0.05 lbs/day, and the boiling poi nt of diesel is greater than :502OF. The bioremedial system will utilize active mechanical cultivation by a tractor and plow or dozer and ripper combination. Microbes that would be added to the soil will be done during EB-801 O- 1 9107-E031 .WP ~rco 41 21 South H Street 9 Jultj 12,, 1991 the soil moisture conditioning process utilizing a sprinkler system, if needed. Tilling of the stockpiled material would be conducted on a weekly basis. The impacted soil will be placed withi n the treatment cell at a thickness no greater than 12 inches on an impermeable liner. The treatment cell will be approximately 400 feet by 200 feet, and will be bounded on the outside by a three foot berm. Soil mixing, moisture conditioning, and maintenance of microbe populations in the treatment stockpiles will be performed periodically through application of soil nutrients, water and bacteria, as required. In addition, soil nutrient values and plate counts will be tested throughout the treatment process to determine the progress of activity. ~pproximate]y two to three interim soil sampling events will be conducted and soil samples analyzed to evaluate the progress of the treatment process. Treatment Cell: I nterim and Verification Soil Sampling The progress of the treatment will be monitored periodically by an assistant geologist or engineer using a OYM photo-ionization detector (PID) or a Fo×boro® OV/~ (organic vapor analyzer) 108 flame-ionization meter. Approximately two interim soil sampling events will be conducted and soil samples anal yzed to evaluate the progress of the treatment process. ....~.-. Soil sampling will be accomplished with a Z.5-inch diameter hand held ring sampler equipped with stainless steel liners for soil retention. Soil samples will be collected upon setup of the system to obtain initial concentrations and at periodic intervals, as well as for final verification of treatment. When contaminant levels are thought to be acceptably low (to specified clean-up level or less), the soil stockpile will be sampled in the presence of a representative of the Kern County Department of Environmental Health Services. Soil samples will be sealed with Tat'Ion® film, capped, and placed on ice for transport to a California Department of Health Services (DOHS) certified laboratory. Strict chain of custody procedures will be utilized for all samples collected to ensure sample integrity and to document sample possession from the time of collection to the final destination. All sampling equipment will be washed with TSP (tri-sodium phosphate) cleanser, and rinsed with tap water and de-ionized water prior to sampling, between sample intervals to minimize the possibility of cross- co nra mi nati on. EB-801 O- 1 9107-E031 .~'P Arco 4121 South H Street 10 Laboratory Analysis of Soil Samples o,,J~ ~% ~ ' We anticipate a total of 4 to 5 soil samples will be collected during each sampling interval. We anticipate the final verification sampling may require at least 10 soil samples. $oil samples will be sent to a state-certified laboratory for chemical analysis. Soil ~mples will be analyzed for Total Petroleum Hydrocarbons (TPH) as diesel by the D.O.H.S.L.U.F.T Method, and the fuel constituent volatile aromatics (BTEX) using USEPA Method 8020. Treated Soil Disposition The clean treated soil will be used as grading fill on the subject property. The treated soil will be spread at a thickness of no greater than two inches over the property. Report P re pa ratio n The project manager will prepare a progress report as well as a final report documenting the results of the soil treatment which will be sent to the client. The final report will be signed by a Registered Geologist and will contain a summary of the installation and t rear me nt activi ti es, req ui red per mi ts, a si te ma p s howl ng soil sa m ple 1 ocatio ns, deec ri ptio n of methodologies used, certified laboratory reports and chat n of custody documents. A request will be made for closure of the case at this time. Schedule and Conditions It is expected that the remediation cell can be constructed within 3 days upon receiving approval of the workplan by the county. The excavation, placement of contaminated soil in the treatment cell, and soil preparation should be completed within two weeks of completion of the cell. We anticipate that the soil will be monitored once every two weeks with a OYA, with the fi rst i nteri m sampling to be conducted approxi matel y 3 weeks from the initial construction. ~ progress report will be submitted to the client and the Kern County Department of Environmental Health Services after construction and two rounds of sampling have been completed. With approval of the Kern County Department of Environmental Health Services, upon completed treatment of the soils, the system will be dismantled and the remediated soils may be used as grading fill on-site. EB-801 O- 1 9107-E031 ."VP Arco 4121 South H Street 11 July 1.2, 1991 Based on the volume of contami nated soil and concentrations of TPH encountered during excavation activities, we antici pate complete remediation of soils to 1,000 ppm TPH or below to take on the order of :~ months from initial treatment. Thank you for your consideration of this work plan. If you have any questions, or if we can be of service in any way, please contact this office at your convenience. EARTH SYSTEMS EN¥1RONMENTAL, I NC. Mark R. Magarge~,, RG/' ,%nior Geologist CC: 1 - Addressee 1 - Mike Stahl, Arco Oil and Gas Company 1 - SLO 1 - BAK EB-801 O- 1 9107-E051 .WP · . ~ . ~ - j ~ ~m - ~:.. · ' ' J ~ d ~ J -~. ~. ~ ~ I ~ ' [] ~ ~:1 .. ,,~.,, L , 1 ~ PANAMA .~ ~ o ~ ~/ ~~ ' ',, EaCh Systems TITLE Fig~r~ '-"-'-'-'- / 6701 McDivifl Drive, SuHe B ~ker5fm~, CA ~313 (~) ~ ~~~/~ ~/~~/~ JOB NO. I APPENDIX A SITE HEALTH AND SAFETY PLAN SITE HEALTH AND SAFETY PLAN SITE DESCRIPTION The subject site is located south of White Lane, and west of H Street in the city of Bakersfield, Kern County, California. The site comprises a half section of land, and is currently vacant with no improvements remaining. All previously facilities at the site have been demolished and removed. The site is situated within a predominantly industrial and commercial area. Some industrial buildings and a railroad track are located approximately 1/8 mile west of the site. The site itself is anti tel y graded dirt with little vegetation, and no structures. The overall site topography is essentially flat. SITE HISTORY According to the Wilson and Associates Site Assessment Report, dated July, 1990, two gasoline tanks, one diesel tank, one solvent tank, two dispenser islands, and associated product lines were removed from the site under permit on December 21, 1989 by Pinnacle Environmental. Reportedly, no soil was removed from the site during removal of the tanks and dispensers; the area displaced by the former tanks was filled with imported soil. During the UST removal activities on December Z l, 1989, soil samples were collected from beneath the tanks, dispensers, and product lines, at the direction of the Kern County Environmenta] Health Department (KCEHD). Subsequent laboratory analysis of the soil samples from beneath a 5,000 gallon fuel tank, the western dispenser of both dispenser islands, and the product line indicated concentrations of total petroleum hydrocarbons (TPH) as diesel above the Regional Water Quality Control Board (RWQCB) Action Level for this compound in soil. Based on these analytical results Wilson and Associates was retained to perform a site characterization. The data obtained from the site characterization suggest that soil impacted with TPH as diesel at concentrations above RWQCB Action Levels exists at the subject site in a broad area from the 5,000 gallon tank, to the product lines, and the ,~'estern dispensers of both dispenser islands. The vertical extent of the contamination does not appear to exist more than approximately 5Z feet below the ground surface. Based on the relatively high concentration of TPH detected, excavation and remediation of approximately 5,;~00 cubic yards of soil is req ui red. A fcc 41 21 So ut h H St reef 2 PURPOSE The purpose of this plan, which was developed specifica11U for' operations at the referenced, site, is to assign responsibilities, establish personnel protection standards and mandatory safety procedures, and provide for contingencies that may arise while removal, and bioremediation of the diesel impacted soil are being conducted at the site. This plan complies with, but does not replace, Federal Health and Safety Regulations as set forth in 29 CFR 1910 and 1926, California Health and Safety Regulations set forth in Title 8, California Code of Regulations, and guidance established by the California Department of Health Services. This plai is to be used by ESE as a supplement to such rules, regulations, and guidance. APPLICABILITY The provisions of the plan are mandatory for all on-site ESE employees engaged in activities known to be or potentially associated with the presence of hazardous materials. These acti. vities may include, but are not limited to, mobilization, project operations,, and demobilization. Changes and/or unantici pared site conditions may requi re modification of this Site Health and Safety Plan (SHSP) in order to maintain a safe work environment. Any proposed changes to this, plan should be reviewed by the Corporate Health and Safety Officer of ESE, prior to their imolementation. ' If this is not feasible, the project team leader may modify the plan and record all changes in the field log book. Under no circumstances will the plan modifications conflict with Federal, .statUe, or local health and safety regulations. Under Z9 CFR 1910.1Z0 (b) (15) ESE is required to notify each subcontractor of the hazardous materials identified by ESE. The acceptance of such responsibility does not and shall not be deemed an acceptance of responsibility for any other health and safety requirement$, such as those related to excavating, trenching, drilling or backfilling. Each subcontractor shall perlorm all work in accordance with a Site Health and Safety Plan for its employees, which covers any exposure to hazardous materials which may be present on site. The subcontractor shall hold ESE harmless from, and indemnify it against, all liability in the case of any injury or i nj ury of its own employees. ESE reserves the right to review the subcontractor's Site Health and Safety Plan at any time. , ESE reserves the right to suspend the subcontractor's site work and ask the subcontractor's personnel to evacuate the hazard area in the event of grossly inadequate health EB-SO 10-1 9107-E051 .WP Arco 41 21 South H Street JulY42;. 1991 and safety precautions on the part of the subcontractor or the belief that the subcontractor's personnel are or meg be exposed to an immediate health hazard. KEY PERSONNEL AND RESPONSI BI LITI ES The key personnel and their responsibilities for this project are as follows: Corporate Health and Safety. Officer The ESE Corporate Health and Safety Officer (CHSO) for this project is Mr. Robert Mohle. It is his responsibility for developing and coordinating the ESF health and safety programs. For this project, he is responsible for reviewing and approving this SHSP for accuracy and incorporating new information or guidelines which aid the Project Manager and Site Health and Safety Officer in further definition and control of potential health and safety hazards associated with the project, Project Manager The ESE Project Manager (PM) for this project is Mr. Mark Magargee. It is his responsibility to report to upper-level management. The duties of the PM are as follows: · Prepare and organize the SHSP which describes all planned field activities that may be encountered at the site. · Obtai ns permission for site access and coordi hate field activities. · Brief field team on specific assignments and potential hazards, and ensures that all health and safety requirements are met. · Provides a copy of this SHSP to each member of the project field team. Site Health and Safety Officer The ESE Site Health and Safety Officer (SHSO) for this remediation is also Mr. Mark Magargee. He advises the PM on all aspects of health and safety on-site and recommends stopping work if any operation threatens worker or public safety. Other duties i ncl ude: · Implement the SHSP. · :~elect personal protective clothing and equipment specific for the project and ensures that they are properly stored and mai ntai ned. EB-801 O- 1 9107-E051 .~'P Arco 4121 South H Street 4 · Assure that all personnel assigned to site have appropriate health and safety training and have e current baseline medical examination. · Assign key safety duties and responsibilities to team members. · Monitor the work parties for signs of stress, and also monitors on-site hazards and conditions. · Know emergency procedures, evacuation routes, arranges on-site first aid facilities and off-site emergency care. · Conduct daily safety meetings and periodic inspections to determine if SNSP is being followed. · Establish and maintain site record keeping, including reporting accidents, as requi red. · Partici pate i n preparation of SHSP and revise it as necessary. · Verify that drilling or excavation locations have been cleared for underground utilities and other subsurface structures before subsurface exploration is i nitiated~ Team Members The responsibilities for the team members are as follows: · Take all reasonable precautions to prevent injury to themselves and to their fellow employees; and · Performing only those tasks that they believe they can do safely, and immediately reporting any accidents and/or unsafe conditions to the client and the CH$O. · Implementing the procedures set forth in the SHSP, and reporting any deviations from the procedures described in the Plan to the SH$O and to the CHSO. SITE INFORMATION All field activities will take place on the Arco 0il and Gas Company, 4121 South H Street property. All excavation activities will take place in the daylight hours between 7:00 A.M. and 7:00 P.M. The presence and location of hazardous materials, which are hydrocarbon compounds, has been confirmed through previous investigations. If needed, three blasts of a horn will be £B-8010-1 9107-E051 .WP Arco 41 21 South H Street 5 JulyJ~2:~'.l:g91' sounded for site evacuation. This site information is current and has been verified through ana] ytical testi ny. HAZARD ASS£SSHEHT Hazardous Materials Hazardous materials may be a health hazard to site personnel via ingestion, skin absorption, or inhalation. Biohazards or accidental ingestion of contaminants may occur via hand-to-mouth actions. Dust inhalation may also contribute to ingestion of chemical contaminants. During excavation, soil sample collection, and sample preparation, inhalation of contaminant vapors could occur. Ski n absorption may occur via contact with contaminated soil and/or ground water. The degree of hazard depends upon the adverse characteristics and toxicity of the chemical contamination, the amount of potential contact, and the exposure time. The greatest potential for chemical hazard to site personnel is during excavation activities. The following substance is potentially a chemical hazard at the subject site: Substances Involved Hydrocarbon Fuels Physical State Liquid/Absorbed Characteristics Irritant The following materials potentially present at this project site are specified by California Health and Safety Code Z5249.5 as recognized and confirmed by the State of California as carcinogenic and/or mutagenic: 1. Diesel fuel containing benzene. Potential Worker Hazards With hydrocarbon-based liquids, contact may result in dermal irritation due to desiccation. Respiration of air laden with hydrocarbon vapors may result in oxygen deficiency and/or mucous membrane irritation. Mixtures of air and hydrocarbon fuels exhibit an explosive range thus presenting an explosion hazard. Diesel fuel may contain minor amounts of benzene, a proven human carcinogen. Potential exposure values and limits for benzene are listed in the table below. "- EB-8010-1 9107-E031 .WP Arco 4121 South H Street- 6 TABLE 1 - POTENTIAL EXPOSURE VALUES Chemical Highest Conc. IP 1 TLY2 IDLH3 Level Flammable Rencje Detected in Samples (electron (ppm) (percent) (ppm) volts) Benzene 1.0 0.9245 1 0 Carcinogen 1.3 - 7.1 1 Ionization Potential in electron volt: (eV) 2Threshold Limit Value as the time-weighted average (TW A) published b~j the American Conference of Governmental Industrial Hggienists (ACGIH) $1mmediatelu dangerous to life and health (IDLH) level as published by National Institute of Occupational SafetU and Health (NIOSH), Publication Number $5-114, September 1985. NA: not available Benzene is a colorless liquid with an aromatic odor. It is incompatible with strong oxidizers like chlorine or bromine with iron. The routes of exposure for benzene include inhalation, skin absorption, ingestion, and ski n and/or eye contact. Symptoms of exposure to benzene include irritation to the eyes, nose, and respiratory system, giddiness, headache, nausea, staggering gait, fatigue, anorexia, lassitude, dermatitis, and abdominal pain. The potential health hazard from benzene exposure is very slight at this site. Conditions for Suspension of Operations Site monitoring equipment will i ncl ude a Photo-ionization detector (PID) or a Flame- ionization detector (FID) during drilling and trenching. Field activities at Level D will be ~uspended when the continuous FID or PID level in the breathing zone increases to ten times background levels (assuming an ambient range of five to ten ppm). Level of Protection The level of Personal Protection Equipment (PPE) needed for this investigation is Level D. Level D PPE includes coveralls, leather boots with steel toes and shanks, eye protection, safety helmet and gloves. If warranted, this Site Safety Plan can be modified for use of Level C situations. Modification to Level B or Level/t is beyond the scope for this Site Safety Plan and is not permitted. EB-8010-1 9107-E051 .WP Arco 41 21 South'H Street The criteria for upgredi ng to Level C PPE is the detection of unknown gassea or vapors in concentrations greater than 10 ti mas background levels or unknown ]iquids present within the work area. Level C PPE includes Tyvek suits, nitrile gloves end rubber boots, eye protection, hard hat, and a full-face air-purifying respirator with Scott 642-OA-H cartridge-filters or equivalent. Physical Hazards Excavation equipment will be working near petroleum pipelines. positioned upwi nd from oPerating equipment at all ti mas. All workers will be E×cavation Sloping Contaminated soils in the areas identified by ESI[ will be removed by excavating with a backhoe. Excavating will proceed to the maxi mum depth of 32 feet below grade, if necessary.' It is recommended that all open excavations be fenced. The sidewalls for all excavations will be · designed to protect employees working in excavations from cave-ins and be in accordance with Federal OSHA requirements in 29-CFR Part 1926, Appendix B to Subpart P. The maximum allowable slope for each excavation will depend on the soil type and shall be determined from Table B-1 in 29 CFR Part 1926. The actual slope of the excavations will be less than the maxi mum slope, when there are signs of distress. If this situation occurs, the slope will be cut back to an actual slope which is at least one-half horizontal to one vertical (1/2 H: 1 ¥) less steep than the maxi mum allowable slope. Slip_s, Tri ps and Falls All field personnel shall become familiar with the general terrain and potential physical hazards (ravines, potholes., and loose gravel) which would be associated with accidental risk to sli ps, tri ps and/or falls. S_plashes and Spills All field personnel shall wear appropriate chemical prevent potential dermal exposure to accident splashes and excavation of contaminated soil and soil sampling. resistant gloves and goggles to spills that may occur during EB-8010-1 9107-E031 .WP Arco 4121 South H'Street~ S Sunburn Working outdoors on sunnu daus for extended periods of time can cause sunburn to the skin. Excessive exposure to sunlight is associated with the development of skin cancer. Field staff should take precautions to prevent sunburn bu using sun-screen lotion and/or wearing hats and long-sleeved garments. Heat Stress Heat stress can be a major hazard, especially for workers donning personnel protective equipment (PPE). The same protective materials that shield the body from chemical exposure also limit the dissipation of body heat and moisture. Heat stress can' occur very quickly, depending on the work being performed, the ambient weather conditions,, clothing, and the individual characteristics of the worker. Because heat stress is probably one of the most common (and potentially serious) illness at hazardous waste sites, regular monitoring and other preventive precautions are vital. Heat stress monitoring should commence when personnel are wearing PPi[, including Tyvek-type coveralls, and the ambient temperature exceeds 70°F. If impermeable garments are not worn, monitoring should start when the temperature reaches 85°F. The following monitoring program is for workers wearing semipermeable or impermeable encapsulating ensembles when the temperature i n the work area is above 70°F: Heart Rate should be measured by the radial pulse during a 3;0 second period as earl y as possible in the rest period. The next work c/cie should be shortened by one-third while the rest period is kept the same, if the heart rate exceeds 110 beats per minute. If the heart rate still exceeds 110 beats per minute at the beginning of the next rest period, shorten the following work cycle by one-third. Preventing heat stress is particularly important because once someone suffers from heat stroke or heat exhaustion, that person may be predisposed to additional heat injuries. To avoid heat stress, the fo]]owi ng steps may be taken: Modifu work/rest schedules according to monitoring requirements, and mandate slowdowns as needed. Alternate personnel assigned to particular tasks to minimize over stress at one job function. Add additional persons to work team, and work during cooler hours, if possible. " EB-8010-1 9107-E051 .~fP Arco 4121 South H Street 9 Jul.Y I I. Provide shelter or shaded areas to protect personnel during rest periods. Maintain workers body fluids to ensure that the cardiovascular system functions adequately by having workers drink 16 ounces of fluid (preferably water) before beginning work, and urge workers to drink at least 1 6 ounces of fluid during each · rest period. Encourage workers to mai ntai n an optimal level of physical fitness. An initial work/rest cycle on one hour work and fifteen mi nutes rest is recommended for protection of staff when the heat stress hazard is high. The recommended cycle will be adjusted up or down based upon worker monitori ny, environmental conditions, and the judgement of the site safety officer. At any ti me field team members recognize the signs or symptoms of heat stress prior to a scheduled rest period, they will notify the site safety officer immediately in order that a rest period can be called. Some of the signs and symptoms of heat stress are heat rash, heat cramps, heat exhaustion, and heat stroke. Heat rash is characterized by a decreasing ability to tolerate heat and skin irritation and may result from exposure to heat or humid air. Skin cleanliness and treatment with mild drying lotions are necessary to prevent infection. Heat cramps are caused by heavy sweating with inadequate electrolyte replacement and are characterized by muscle spasms and pain in the hands, feet, and abdomen. Treatment of this disability consists of admi nisteri ng salted liquids orally. Heat exhaustion may result form physical exertion in a hot environment when cardiac output is inadequate to meet increased flow of blood that results from dilation of peripheral blood vessels or dehydration. It is distinguished by pale, cool, moist skin, heavy sweating, dizzi ness, nausea, and fai nti ng. Fi rst aid for heat exhaustion is as follows: Immediately remove victim to support area, or if you are the victim, proceed to the support area. Decontami hate, if practical, before entering support area. Start cooli rig, but be careful not to cause a chill. If conscious and not in shock, give water to drink slow1 y. If¥omiting, and/or signs and symptoms are not lessening within an hour, call for emergency hal p and/or transport victim to emergency room. " EB-8010-1 9107-E031 .WP Arco 4121 South H Street 10 o If person is a victim of heat exhaustion, they should not work the remainder of the day. The most serious form of heat stress is heat stroke. This is caused when the temperature regulation fails and the body temperature rises to critical levels. Immediate action must be taken to cool the body before serious injury and death occur. Red, hot, usually dry skin, lack of reduced perspiration, nausea, dizziness and Confusion, strong, rapid pulse, and coma are the signs and symptoms of heat stroke. First aid for heat stroke is as follows: Immediately move victim to cool, uncontaminated area, the support area, and remove and dispose of victim's chemical-resistant clothing, if wearing any. Cool the victim rapidly using whatever means necessary. This can include, but may not be limited to, removing clothi ny, fanni ny, and placing i n water. Do not give dri nki ng water to victim. Treat for shock, if needed. Transport the victim to a medical facility immediately for further cooling and monitoring of body functions. Cold Stress Cold stress is a particular concern ,.,,hen field activities are performed while the air temperatures at the site are below 40OF. If winds are blowing at 5 mph or grater and/or the weather is damp or wet, cold stress is even more of a potential hazard. Donning of appropriate clothing, having warm shelter readily available, carefully scheduling work and rest periods, and monitoring workers' physical conditions are precautions that will be taken to prevent cold stress. Cold i nj ury (frostbite and hypothermia) may occur if cold stress is not prevented. As a preventive measure, the body core temperature must not drop below 96.8<'F. Pain in the extremities is the first early sign of cold stress. Severe shivering sets in when the body core temperature drops below 95~F. If this occurs, work will stop immediately and the affected worker(s) will take a warming break of sufficient duration that the signs and symptoms of cold st ross go away. EB-8010-1 910T-EO$1 .WP Arco. 4121 South H Street 1 1 Noise Heavy equipment, such as excavators, may produce loud noise. The effects of noise can include, but may not be ii mired to: Distracted, annoyed, or startled workers. Physical damage to the ear, pal n, and temporary and./or permanent hearing loss. Communication interference that may increase potential hazards due to the inability to warn of dangers and the proper safety precautions to be taken. OSHA regulation 29 CFR Part 1910.95 describes an effective hearing conservation program that must be administered whenever noise exposures equal or exceed an 8-hour, ti me- weighted average sound level of 65 dBA (decibels on the A-weighted scale). In addition, if workers are subjected to noise exceeding an 8-hour, time-weighted average sound level of 90 d BA, feasible ad mi ni st raft ve o r e ngi nee ri ng co nt rol s must be utilized. Heavy__Equipment and Excavating Before beginning any site work, the excavator subcontractor will perform a safety inspection of the excavation equipment. Personnel shall not work with equipment that they judge to be unsafe because of deterioration, missing parts, obvious defects, or improper use for site conditions. All equipment shall be bonded and grounded, sparkproof, and explosion- resistant, as appropriate. Operation of excavators or other heavy equipment in areas with steep embankments or unstable ground will be avoided, if possible. The subcontractor will make appropriate provisions to ensure safe operation of equipment, if it is necessary to operate equipment in these areas. ANSI-approved hardhats must be worn at and near the excavator or any other heavy equipment. Since heavy pieces of equipment will be used during excavation, steel-toed boots/shoes are requi red during drilling operations, as well as during operation of other heavy equipment. The excavator must mai ntai n a safe clearance (at least 10 feet) between overhead utility li nas and the excavation machi nary at all ti mas. -- EB-$O 10-1 9107-E031 .WP ~rco 4,121 South. H Street-~ 1 2 Underground Utilities The general engineering contractor will locate all underground utility locations prior to the starting of excavation activities. Resources used i ncl ude site plans, utility companies, and Underground Services Alert (USA). In California, USA must be contacted at least two, but not more than fourteen, dads prior to excavating on public property. IIEDICAL HONITORI NG All Earth Systems Environmental, Inc. (ESE) employees assigned to the sampling operations must be active participants in ESE Employee Medical Surveillance Program, which meets the requirements of 29 CFR 1910.120. ESE's program requires employees assigned to hazardous waste site investigations and remediation to take pre-assignment, annual, and exit medical examinations. The CHSO will maintain current copies of training certificates and statements of medical program partici patton for all site personnel. Work- Rest Schedule Depending on the prevailing temperature and humidity, a work-rest schedule may be necessary. Duration and frequency will be at the discretion of the excavator and/or site supervisor. A suppl U of potable water will be kept available near the site. Safety T rai ni ng Field personnel must receive 40-hour basic health and safety training, designed to comply with the OSHA/EPA requirements for hazardous waste operations and eight hours of annual refresher as set forth in 29 CFR 191 0.1 20~ and attend a site-specific safety orientation conducted by the project supervisor. The briefing shall i ncl ude the folloving: 1 ) A briefing on the work to be performed and the work schedule 2) A discussion of the potential chemical and physical hazards associated with the work to be pe rfo r mad 3) Hazard identification 4) Purpose and limitations of personal protective equipment 5) Decontamination and emergency response procedures 6) Proper on-site conduct. EB-8010-1 9107-E051 Arco 41:21 SouthH Streett 13. EHERGENCY CONTACT AND PROCEDURES Contacts Should any situation or unplanned occurrence require outside or support services, the appropriate contact from the fo]lowi ng should be made: ~gency Person to Contact Telephone Ambulance dispatcher 911 County Fire Department dispatcher 911 Police dispatcher 911 Mercy Hospital dispatcher (805) 328- 5275 Dept. of Environ. Health Joe Canes (805) 861 - 3636 To reach Mercy Hospital, take White Lane west Freeway 99 turn north on Freeway 99; take FreeWe~j 99 to California Avenue Exit and exit right. Proceed east on California Avenue one block to Oak Street, and turn left. Proceed one block north on Oak Street over railroad overpass to Tru×tun Avenue, and turn right. Proceed east on Tru×tun Avenue following the signs to the emergency entrance of the hospital at 2215 Tru×tun Avenue which will be on the right (south side of Tru×tun Avenue in Bakersfield). Paramedics should be summoned in the event of a serious injury; they will arrange to transport the victim to the nearest appropriate facility, h first aid kit will be available at the site for use in case of minor injuries. If anyone receives a splash or particle in the eye, the portable eyewash wi]] be used to irrigate the eye for 15 minutes. If direct contact with contaminants occurs, affected ski n areas should be washed i mmediatel y with soap and water. At least one person at the site will have current certification in Fi rst Aid and CPR. SITE LAYOUT The level of hazard associated with the work to be performed does not require dividing the site into formal e×clusion, contami nation reduction, and support zones. However, care will be taken to avoid breathing vaporized diesel fuel. EB-$O 1 O- 1 9107-E031 .WP Arco 4121' SOuth':H~Street,~. .~ 14 CONTAMI NATION MONITORI I; Organic vapor monitoring, of the ambient air shall be conducted at reasonable intervals as determined by project personnel. The purpose of monitoring is to determine if vapor levels i n the work area are high enough to warrant personal protection measures or evacuation of the site. Organic vapor levels should be monitored using an 0¥M photoionization meter with an 11.7 e¥ lamp (probe), calibrated to benzene or a Foxboro~ 0¥A (organic vapor analyzer) 108 flame-ionization detector calibrated for non-methane hydrocarbons. Background should be determined by taking readings before sampling begins. All readings, background and others, must be recorded. If any continuous measurement is observed to be 10 times over background levels in the work area, respiratory protective action will be required. Lesser protective measures are at the field geologists or en¢ nears discretion. DECONTAMINATION Before leavi ng the site/work area, personnel must remove all protective equipment and wash thai r hands, faces and necks. These washing procedures shall be observed before all work breaks. To minimize the potential for cross-contamination, all excavation equipment shall be decontami hated before the start of drilli ny, between borings, and before removal from the site. Sampling equipment shall be decontaminated before sampling and between sampling with washing with laboratory-grade detergent, a water ri nse and a contami nant-free distilled water ri nse. EMERGENCY PROCEDURES Emergency conditions are considered to exist if: * Any member of the field crew is involved in an accident, experiences any adverse effects or symptoms of exposure while on-site; or * A condition is discovered that suggests the existence of a situation more hazardous than anticipated. In the event of an on-site emergency, the procedures described below are to be i mmediatel y followed. EB-8010-1 9107-E051 Personnel on-site should use the "buddy system" (stay in pairs). In the event of a communication breakdown, i.e. radio malfunction or if radios are not available, "buddies" should use prearranged hand'signals or other means of emergency signals as follows: Hand gri ppi ng throat - out of ai r, can't breath. Grip partner's wrist or place both hands around waist - leave area immediately, no de bate ! Hands on top of head - need assistance Thumbs down - no, negative. The field engineer or geologist will establish emergency evacuation routes and will make all project personnel aware of these routes prior to the first on-site activities. In the event of an emergency, selection other escape roUte will be based on the nature of the emergency and wi nd di faction. Visual contact should be mai ntai ned between "buddies" on-site, with the team remai ni ng in close proxi miry in order to assist each other in case of emergencies. In the event that any member of the field crew experiences any adverse effects of symptoms of exposure while on site, the entire field crew should immediately halt work and follow the instructions provided the project supervisor. Wind indicators visible to all on-site personnel should be supervisor to indicate possible routes for upwi nd escape. provided by the project The discovery of any condition that would suggest the existence of a situation more hazardous than anticipated should result in the evacuation of the field team and re- evaluation of the hazard and the level of protection requi red. In the event an should accident occur, it will be necessary to complete an Accident Report Form with the company Safety Officer. -- EB-801 O- 1 9 ! O?-E031 .WP STANDARD SAFE-WORK PRACTICES General Eating, drinking, chewing tobacco and smoking are prohibited in the contaminated or potentially contaminated area of where the possibilitg for the transfer of contamination exists. Avoid contact with potentially contaminated substances. Do not walk through puddles, pools, mud, etc. Avoid, whenever possible, kneeling on the ground, leaning or sitting on equipment or ground. Do not place monitoring equipment on potentially contaminated surfaces (i.e., ground, etc.). All field crew members should be alert to the presence of strong, i rritati ng or nauseating odors that could indicate a potentially dangerous situation. Other senses should be kept alert to possi bls hazards as well. Precaution should be taken to prevent spillage. In the event a spillage should occur, the liquid should be contai ned. Prevent splashi ng of the contami nated liquids. Field crew members shall be familiar with the physical characteristics of investigations, i ncludi ng the fo]]owi ng: Wi nd di rection in relation to ground-zero area. Accessibility to associates, equipment, and vehicles. Communications. Hot Zone (areas of known or suspected contamination). Site access. Nearest water sources. The number of personnel and equipment in the contaminated area should be minimized but only to the extent consistent with ,,/ork-force requirements of safe site operations. All wastes generated during Earth Systems Environmental, Inc. and/or subcontractor activities at the site remain the property of the client. - EB-8010-1 9107-E031 .~'P PLAN a~,'CEPTAI::E FORM The Plan kcceptance Form (attached) should be filled out bu all emplouees vorkJn(j on the site and retained in the job file. Corporate Health 8, Safetu Officer Robert Mohle (805) 541-5983 Site Safety Officer Mar k Magargee (805) 836-0901 - office (805) 323-0267- home Project-Site Safety Plan prepared by Mark Magargee in conjunction with the Corporate Health & Safer y Office r. .... EB-801 O- 1 9107-E03.1 .WP 18 The undersigned have read and understood the attached ~efety plan and agree to comply ~,ith the provisions of this plan. Name Date Name Date Position Position Name Date Name ' Date Position Position Name Date Name Date Position Position Name Date Name Date Position Position Name Date Name Date Position Position EB-801 O- 1 9107-E051 .'w'P ~: ': ' T.' . : .... :.~ Western. District',~: ..... Post 0ffice Box'147 ~' .' Bakersfield;.California.93302:. Telephone 805 321 4000 December 17, 1991 Mr. Joe Canas Hazardous Materials Specialist Kern County. Environmental Health Department 2700 "M" Street, Suite 300 Bakersfield, California 93301 Re: South "H" Street Site Closure Report 4121 South "H" Street, Bakersfield Dear Mr. Canas: Attached, please find the closure report for the subject location. This closure report is a followup to the progress report sent to you on September 17, 1991 detailing the results of the samples collected at the base and sides of the excavation. The closure report also includes data from samples collected from the remediation of the excavated soil. Also enclosed are results of additional site characterization performed at the subject location. As you are aware, a potential purchaser had contracted with an environmental consulting firm to perform a property assessment. The results of that assessment provided ARCO with information that required further investigation prior to the submittal of the closure report for this location. The additional characterization has determined that a very small amount of diesel impacted soil may have remained after the excavation. The vOlume of soil is estimated at less than 50 yards with a maximum analyzed TPH concentration of approximately 2400 mg/kg. Given the very limited volume of impacted soil which remains, the 150 feet of vertical separation to the first known occurrence of groundwater, the considerable clay content observed in the characterization, and limited annual rainfall, we believe the site should be considered for closure. If you have any questions or need additional information, please don't hesitate to contact me at (805) 321-4307. Sincerely, Michael A. Stahl Senior Environmental Coordinator ARCO Oil and Gas Company is a Division of Atlantic Richfield Company Earth Systems Environmental, Inc. A Member of The Earth Systems Group , 6701 McDivitt Drive, Suite B · Bakersfield, CA 93313 · (805) 836-0901 * FAX (805) 836-091.1 December 17, 1991 Doc. No.: 9112-E037.RPT Project No.: EB-8010-1 ARCO Oil and Gas Company 4550 California Avenue Bakersfield California 93309 Attention: Mr. Mike Stahl SUBJECT: RESULT OF ADDITIONAL SITE CHARACTERIZATION OF SO1LS CONTAINING DIESEL HYDROCARBONS AT THE ARCO OIL AND GAS COMPANY FORMER MAINTENANCE FACILITY 4121 SOUTH 'H' STREET, BAKERSFIELD, CALIFORNIA REFERENCE: CLOSURE REPORT OF BIO-RECLAMATION OF SOILS CONTAINING SEMI-VOLATILE PETROLEUM BASED COMPOUNDS FORMER ARCO SERVICE STATION, 4121 SOUTH 'H' STREET BAKERSFIELD, CALIFORNIA (ESE, DECEMBER, 199 I) REFERENCE: PROGRESS REPORT OF BIO-RECLAMATION OF SOILS CONTAINING SEMI-VOLATILE PETROLEUM BASED COMPOUNDS FORMER ARCO SERVICE STATION, 4121 SOUTH 'H' STREET BAKERSFIELD, CALIFORNIA (ESE, SEPTEMBER, 1991~ REFERENCE: WORKPLAN FOR BIO-RECLAMATION OF SOILS CONTAINING SEMI-VOLATILE PETROLEUM BASED COMPOUNDS FORMER ARCO SERVICE STATION, 4121 SOUTH 'H' STREET BAKERSFIELD, CALIFORNIA (ESE, JULY, 1991) REFERENCE: SITE ASSESSMENT REPORT.. FORMER ARCO DIESEL TANK SITE, 4121 SOUTH 'H' STREET, BAKERSFIELD, CALIFORNIA (WILSON & ASSOCIATES, INC., JULY, 1990) Dear Mr. Stahl: Earth Systems Environmental (ESE) has been contracted by ARCO Oil and Gas Company (ARCO) to prepare this addendum to the site characterization report of diesel impacted soil at the former ARCO maintenance facility located at 4121 South H Street, Bakersfield, California (Figure 1).' Additional characterization activities were conducted as a result of laboratory results from soil borings advanced in conjunction with a Phase II Property Transfer Assessment conducted by a third party environmental consulting firm (the consultant) for a prospective buyer of the subject property. The Consultant advanced three soil borings at locations along the flanks of the former excavation pit from which the impacted soil had been removed. These borings intersected native soil at a depth of approximately 19 feet below surface grade. The consultant field screened hydrocarbon vapors in two of the soil borings from below that depth through a depth of approximately 25 feet below surface grade in each of the two borings. Soil samples collected from a depth of 20 feet below surface grade were analyzed for diesel and fuel constituent volatile aromatics. Diesel was detected in the sample along the western flank at a concentration of approximately 9,000 mg/kg, and in the soil sample from the eastern..- flank at approximately 11,000 mg/kg. The third boring was located 10 feet to the south of the afore mentioned boring on the eastern flank of the excavation. No diesel hydrocarbons were reportedly field screened from the subject interval, and no diesel hydrocarbons were detected in a soil sample analyzed from a depth of 20 feet in this boring. Upon being informed of this data, ARCO contracted with ESE to assess the vertical and lateral extent of the diesel hydrocarbons which were apparently not removed during the previous excavation at the site of the diesel impacted soil. These activities included advancing ten soil borings in the vicinity of the flanks of the former excavation pit, analyzing 27 soil sample_.s_for the presence of diesel and the fuel constituent volatile '-'~~an~i-preparing this report of findings. 1.0 INTRODUCTION Following the Kern County Department of Environmental Health Service's (KCDEHS) conditional approval of the excavation and bioremediation work plan, ESE conducted excavation at the site of the diesel impacted soil on August 5 though August 7, 1991 (Figure 2). At that time eight soil samples were collected from the base and sidewalls of the pit and analyzed for the presence of diesel and the fuel constituent volatile aromatics to verify that no hazardous concentrations of these compounds remained in the subsurface (Figure 3). Upon receiving this confirmation, and with KCDEHS approval, the pit was backfilled with "clean" fill material, compacted and returned to surface grade. EB-8010-1 9112-IS037.RPT ~A~o O~1 ami C.~ Company' 3 The excavated soil was placed as a one foot layer on an above ground treatment membrane constructed of visqueen plastic liner. Treatment of the soil has consisted of enhancing indigenous soil microbes through the oxygenation effects of mechanical cultivation. On September 10, 1991 ten soil samples were collected from treatment cell and analyzed for the presence of diesel, and the fuel constituent volatile aromatics. The analytical results indicated that the mechanical cultivation had been highly successful in reducing the concentration of petroleum hydrocarbons. On October 25, ten additional soil samples were collected from the treatment cell in the presence of Mr. Joe Canas of the Kern County Department of Environmental Health Services. The analytical results indicated that no concentrations of diesel in excess of 40 mg/kg remain, and the fuel constituent volatile aromatics can not be detected in the treated soil. Upon review of the laboratory reports and with the approval of the County, ESE spread the soil on-site as grading fill to a thickness of less than two inches, and disassembled the treatment cell. A third party consultant was contracted by a prospective buyer of the subject property to conducted Phase I site research, and Phase II site assessment activities associated with a Property Transfer Assessment. The consultant advanced a soil boring along the west flank, and two soil borings along the east flank of the former excavation pit at the north end of the pit. These borings intersected native soil at a depth of approximately 19 feet below surface grade. The consultant field screened hydrocarbon vapors from below that depth through a depth of approximately 25 feet below surface grade in two of the borings. Soil samples collected from a depth of 20 feet below surface grade were analvzed for diesel and fuel constituent volatile aromatics. Diesel was detected in the sample along the western flank at a concentration of approximately 9,000 mg/kg, and in the soil sample from the eastern flank at approximately l 1,000 mg/kg. The third boring was located 10 feet to the south of the afore mentioned boring on the eastern flank of the excavation. No diesel hydrocarbons were reportedly field screened from the subject interval, and no diesel hydrocarbons were detected in a soil sample analyzed from a depth of 20 feet in this boring. Upon being informed of this data, ARCO contracted with ESE to asses the vertical and lateral extent of the diesel hydrocarbons which were apparently not removed during the previous excavation at the site of the diesel impacted soil. These EB -8010-1 9112-E037.RPT Arco Oil'and Oa~ Company activities included advancing ten soil borings in the vicinity of the flanks of the former excavation pit, and analyzing 27 soil samples for the presence of diesel and the fuel constituent volatile aromatics. The borings included two which twinned the consultant's borings, and eight borings advanced laterally from these borings at six foot step out intervals. Interpretation of the laboratory results and the lithologie sequence encountered indicates that a more permeable silty sand sequence, containing concentrations of diesel hydrocarbons in excess of 1,000 mg/kg is present on each of the flanks within a depth interval from approximately 19 to 26 feet below surface grade. Along the western flank this zone has an radial extent within the surrounding six foot step out borings. Along the eastern flank this zone has an radial extent within the surrounding six foot step out borings, except to the east of the original consultant boring where impacted soil may extend to as much as ten feet eastward of the original consultant boring. The impacted soils are terminated toward the excavation center by the excavation sidewalls towards the deepest point of excavation which was 32 feet below surface grade. Therefore, volume of diesel impacted soil in excess of 1,000 mg/kg along the western flank is estimated to be less than 17 cubic yards. No diesel impacted soil in excess of 10,000 mg/kg is known to exist along the western flank. The volume of diesel impacted soil in excess of 1,000 mg/kg along the eastern flank is estimated to be less than 31' cubic yards. The volume of diesel impacted soil in excess of 10,000 mg/kg along the eastern flank is estimated to be less than 4 cubic yards. ESE was unable to confirm the presence of concentrations of TPH as diesel in excess of 10,000 mg/kg on the eastern flank of the 'excavation. Therefore, the volume of diesel impacted soil remaining at the location of the former underground diesel storage tank in excess of 1,000 mg/kg is estimated to be less than 48 cubic yards. The depth to the regional unconfined aquifer is approximately 175 feet below surface grade beneath the site (Kern County Water Agency, Improvement District No. 4, 1990 Report on Water Conditions, February 1, 1991). No perched ground water is known to exist beneath the subject site. However, perched ground water is known to exist i and 1/2 miles to the east at a depth of 20 feet in the abandoned Kern River channel to the ancient Kern Lake Bed (Kern County Water Agency, 1990 Water Supply Report, May 1991). EB-8010-1 9112-1~037.RPT ,~Arc, o Oil and Gas Company Geologic deposits in the study area include Pleistocene alluvial sediments of the Kern River Formation, which form a homocline dipping gently to the south. The deposits are alluvium consisting of poorly indurated and' dissected fan deposits (CDMG, 1964). Substantial clay content resulting from an overbank depositional setting was observed in the native soils penetrated by the ten borings advanced during this additional assessment, and the seven borings advanced during the original Wilson and Associates assessment which penetrated to a maximum depth of 95 feet below surface grade. These low permeability zones included a silty clay from approximately 24 to 28 feet below surface grade, a high plasticity clay from 33 to 39 feet below surface grade, another clay from 42 to 45 feet below surface grade, a substantial high plasticity clay from 57 feet to 67 feet, a clay from 83 feet to 87 feet, and a clayey silt from 87 to 95 feet which was the deepest depth penetrated in the assessment borings. ESE recommends that the site be considered tbr closure. In ESE's professional opinion given the very limited volume of impacted soil which remains, the 150 feet of vertical separation between the last known impacted soil and the first known occurrence of ground water, the considerable clay content observed in the characterizations in the intervening soil because of the overbank depositional setting, the 5.72 inches of annual precipitation in Bakersfield, and the proposed site use as a strip shopping center development with a high probability that the subject area will be capped by an asphalt parking lot, reducing the subsequent infiltration of surface waters to the impacted soil and reducing the mobility of the diesel hydrocarbons, that there is a very low risk of the remaining diesel hydrocarbons migrating to ground water at the location of the former tank, product line, and dispenser. Additionally, natural in-situ biodegradation will occur over time to reduce the concentrations of the diesel hydrocarbons. All methods employed by ESE for this additional site characterization are in compliance with regulations and guidelines set forth in California Code of Regulations (CCR) Title 22, Article 11, and Title 23, Chapter 3, California Site Mitigation Decision Tree 'Manual, the Code of Federal Regulations (CFR) Title 29, Part 1910, Section 120, CFR Title 40, Parts 300-399, along with Kern County Department of Environmental Health Services Handbook #UT-35: "Site Characterization and Site Remediation", and the Tri-Regional Board Staff Recommendations for Preliminary EB-8010-1 9112-E037.RPT Evaluation and Investigation of Underground Tank Sites, as well as accepted professional environmental/geotechnical engineering procedures and applicable local regulations. 1.1 Site Description The subject site is located south side of White Lane, and west of South H Street in the city of Bakersfield, Kern County, California (Figure 1). The site was formerly a maintenance facility for ARCO's Kern County operations. The site is situated within a developed urban area. Nearby properties are primarily commercial business along both sides of White Lane and South H Street. The overall site topography is essentially flat, with a very slight fall to the south. 1.2 Background On December 21, 1989, Pinnacle Environmental Corporation removed one t0,000 gallon underground gasoline storage tank, one 5,000 gallon underground gasoline storage tank, one 1,000 gallon underground diesel storage tank, one 1,000 gallon underground solvent storage tank, associated product pipelines, and two dispenser islands, under Permit No. 310063 issued by Kern County (Figure 2). Soil' samples were collected from beneath the former tanks, product pipelines, and dispensers. The samples were analyzed for Total Petroleum Hydrocarbons (TPH) as gasoline and diesel, and the fuel constituent volatile aromatics as well as halogenated hydrocarbons in the vicinity of the solvent storage tank and product pipeline. Concentrations of these' substances were detected in excess of Regional Water Quality Control Board (RWQCB) recommended guidelines. Subsequently ARCO contracted with Wilson and Associates to conduct a site characterization study. Four potential sources were assessed. Three were believed to be diesel impacted soil, The fourth involved a petroleum based solvent. The first diesel source located around the south end of the former 5,000 gallon tank was found to be confined to less than 26 feet in depth and a radius of less than 17 feet. The second diesel source at the northwest dispenser was found to be confined to less than 36 feet in depth and a radius of less than 12 feet. This results in an overlap with these sources forming one continuous volume of impacted soil. The third diesel source at the southwest dispenser was found to be confined to less than 15 feet in depth and a -- EB-8010-1 9112-E037.RPT Arco ~.Ofl ~mfl Gas Company 7 radius less than 8 feet. This results in an overlap with the second source forming a single continuous volume of diesel impacted soil. The fourth source involved possible petroleum based solvent beneath the product lines. The Wilson and Associates assessment included analysis for volatile organics using EPA Method 8240. No chlorinated solvents were detected. What was detected appeared to be 'a high naphthalene solvent commonly referred to as refinery waste cut. This substance contained a variety of volatiles and semi-volatiles which were also common in older vintage diesel fuels like 1,2,3 trimethylbenzene, isopropyltoluene, and xylenes. The fourth source impacted soil to a depth less than 25 feet and less than a radius of 30 feet. This results in a significant overlap with diesel sources one and two. ARCO contracted with ESE to perform the excavation and treatment using bioremedial technologies of the impacted soil. Kern Environmental Services was subcontracted by ESE and provided front end loaders, and a self-elevating paddle wheel scraper to excavate the estimated 3,300 cubic yards of impacted soil at the site (Figure 2). Excavation was conducted on the days of August 5 through August 7, 1991. Diesel impacted soils in the areas identified by the Wilson and Associates, Inc. Site Assessment Study were removed by excavating with front end loaders, and a self- elevating paddle wheel scraper. The contaminated soil was then placed in the remediation cell by a rubber tire front end loader. Excavating proceeded to a depth of 32 feet below surface grade (Figure 3'). Excavation in the vicinity of borings TH-I, TH-2, and TH-4 was conducted to a depth of approximately 28 feet below surface grade. Excavation in the vicinity of boring TH-5 was conducted to approximately 23 feet below surface grade. Excavation in the vicinity of boring TH-6 was conducted to approximately 20 feet below surface grade. Excavation in the vicinity of boring TH-3 was conducted to approximately 15 r'eet below surface grade. Excavation in the vicinity of boring TH-7 was conducted to approximately 13 feet below surface grade. The estimated total volume of impacted soil removed was approximately 3,300 cubic yards (this included partial mixing of clean material from sluff). The excavation was performed so that sidewall slopes conformed to California and Federal OSHA code requirements. During excavation soil samples were collected from the base and sidewalls of the excavation pit and were visually screened for the presence of diesel. Excavation was continued in the areas of the former tanks, and dispensers until there was no -- EB -801 O- 1 9112-E037.RPT · ~ Arco ~Oil. and ~ COml~ny" 8 evidence in the sidewalls and pit base of stained soils, or soils containing diesel odors. Integration of the final dimensions of the excavated pit with data collected from the previous site characterization at the property indicated that no concentrations of diesel in excess of 100 rog/kg should be remaining in the subsurface. Soil samples were then collected under the direction of a KCDEHS representative from the boundaries of the excavation to verify satisfactory removal of the impacted soil. Eight verification soil samples were collected from the base and sidewalls of the excavation pit on the afternoon of August 7, 1991 at the locations shown on Figure 3. Four of the soil samples had been collected at a depth of 30 feet below surface grade, and the other four of the soil samples had been collected at a depth of 20 feet below surface grade. They were positioned to assess the concentrations remaining in the subsurface directly beneath the presumed release points at the fuel tank, product line, and dispenser, as well as providing 'information on the lateral concentrations from these release points remaining in the subsurface. The soil samples were collected in glass jars filled in such a way that no headspace remained, immediately sealed with a Teflon® lined cap, labeled, and placed on ice for transport to a California Department of Health Services (DOHS) certified laboratory. Strict chain of custody procedures were utilized for all samples collected to ensure sample integrity and to document sample possession from the time of collection to the final destination. The eight soil samples were analyzed at Mobile Labs, Inc., a State of California certified laboratory for total petroleum hydrocarbons as diesel using the DOHS LUFT Method, and for for the fuel constituent volatile aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX) bv USEPA Method 8020. All of the eight soil samples analyzed for the presence of TPH as diesel detected those hydrocarbons. Diesel was detected at concentrations ranging from 30 rog/kg to 10 mg/kg. None of the eight soil samples analyzed for the presence of the fuel constituent volatile aromatics detected any of those compounds at or above the minimum reporting level. EB-8010-1 9112-E037.RPT · ArCo Oil and Oas Company 9 Decembe~;~ I7¢, 199I~ Table 1 presents a summary of the analytical results for TPH as diesel, and the gasoline constituent volatile aromatics in soil samples analyzed from the base and sidewalls of the excavation pit: TABLE 1. Analytical Results expressed in milligrams .per kilogram. benzeneI Xylen~s NW-1 20' 20 ND ND ND ND NB-2 30' 30 ND ND ND ND SB-3 30' 10 ND ND ND ND SW-4 20' 20 ND ND ND ND NEW-5 30' 10 ND ND ND ND SEW-6 20' 30 ND ND ND ND NWW-7 20' 20 ND ND ND ND SWW-8 3 0' 10 ND ND ND ND A L NA 10,000 1.0 50.0 68.0 175.0, ND: None Detected at or above minimum reporting level. NA: Not Applicable A L: Regional Water Quality Control Board recommended guidelines for contaminants in soil. These recommended guidelines were calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality standards by a factor of 1,000 to account for attenuation due to soil composition and distance from groundwater. Upon review of the laboratory results, and with the approval of the KCDEHS, the excavation pit resulting from soil removal was backfilled from August 9 through August 15, 1991 with "clean", over excavated soil, and enough import soil to replace the removed impacted soil. The source of the excess fill material was readily available at the subject property. The surface surrounding the excavation was landscaped to a depth not exceeding 2 inches and provided the needed fill material. The soil was compacted to 90% relative compaction in 12 inch lifts under the direction of an on-site soils engineer. Compaction tests were performed at two foot intervals from the base of the excavation to 10 feet below surface grade, and in one foot intervals from 10 feet below surface grade to surface grade. Backfilling will be accomplished using an 815 mechanical compacter, a 966 loader, and a water truck. A report was prepared by the Earth Systems' civil engineering division which certifies that the excavation was backfilled in such a way that the compaction exceeds 90%. EB-8010-1 9112-E037.RPT A third party consultant was contracted by a prospective buyer of the subject property to conducted Phase I site research, and Phase II site assessment activities associated with a Property Transfer Assessment. The consultant advanced a soil boring along the west flank and two soil borings along the east flank of the former excavation pit at the north end of the pit. These borings intersected native soil. at a depth of approximately 19 feet below surface grade. The consultant field screened hydrocarbon vapors from below that depth through a depth of approximately 25 feet below surface grade in two of the borings. Soil samples collected from a depth of 20 feet below surface grade were analyzed for diesel and fuel constituent volatile aromatics. Diesel was detected in the sample along the western flank at a concentration of approximately 9,000 mg/kg, and in the soil sample from the eastern flank at approximately 10,500 mg/kg. The third boring was located 10 feet to the south of the afore mentioned boring on the eastern flank of the excavation. No diesel hydrocarbons were reportedly field screened from the subject interval, and no diesel hydrocarbons were detected in a soil sample analyzed from a depth of 20 feet in this boring. Upon being informed of this data, ARCO contracted with ESE to assess the vertical and lateral extent of the diesel hydrocarbons which were apparently not removed during the previous excavation at the site of the diesel impacted soil. 2.0 METHODS OF ADDITIONAL INVESTIGATION 2.1 Drilling and Soil Sampling The additional site assessment was conducted by ESE on December 7, and 8, 1991 using a CMETM B-55 truck mounted drill rig, operated by Earth Systems Consultants, and equipped with 6 3/4-inch diameter hollow-stem augers. The augers were steam cleaned prior to use to minimize the possibility of cross-contamination. A total of ten soil borings were drilled within this phase of additional soil characterization (Figure 3). One soil boring, L-l, was drilled adjacent to the location of the consultant's boring on the west flank of the former excavation pit to a depth of 31 feet below surface grade to assess vertical extent of the diesel hydrocarbons observed in the consultant's boring. The second boring, L-2, was advanced six feet to the north of L-1 to a depth of 31 feet below surface grade. Borings L-3, and L-4 were advanced six feet to the west and south of L-l, respectively, and both were advanced to a depth of 26 feet below surface grade. Neither L-3 or L-4 field screened the EB-8010-1 9112-E037.RPT Oil'and C_.ras Company 11 presence' of diesel hydrocarbons, and therefore, no additional step out borings were advanced to the west or south. However, diesel hydrocarbons were field screened to the north of L-1 in L-2 and therefore an additional boring L-10 was advanced 12 feet north of L-2 to a depth of 26 feet below surface grade. No boring was advanced to the east of L-1 since the excavation sidewall in that area had cut 'to a depth of 30 feet to the east of L-I.. Boring L-5 was advanced at the location of the consultam's boring on the eastern flank of the excavation pit to a depth of 36 feet below surface grade. Boring L-6 was advanced six feet east of L-5 to a depth of 36 feet. Boring L-7 was advanced six feet north of L-5 to a depth of 41 feet below surface grade. The consultant had previously advanced a third boring ten feet south of the location of L- 5 which did not detect diesel hydrocarbons within the interval from 20 to 25 feet below surface grade and therefore, ESE did not advanced an additional boring south of L-5. No boring was advanced to the west of L-5 since the excavation sidewall in that area had cut to a depth of 30 feet to the west of L-5. Because diesel hydrocarbons were field screened in boring' L-7 to the north of L-5, boring L-8 was advanced six feet north of L-7 to a depth of 36 below surface grade, Because diesel hydrocarbons were also field screened in L-8, boring L-9 was advanced six feet north of L-8 to a depth of 26 feet below surface grade. A California Registered Geologist was on site to log the borings, monitor soils during drilling, and collect soil samples. Boring logs are presented in Appendix A. Soil samples were collected at 5-foot intervals in each of the borings using a split-sPoon sampler (ASTM D 3550 with shoe similar to ASTM D 1586) equipped with three 6-inch by 2.5-inch diameter stainless steel sleeves for soil retention. The soil samples were obtained by driving the sampler with a 140-pound hammer dropping 30 inches in accordance with ASTM D 1586. The lowermost sleeve at each sample interval was screened for total organic vapors with a photo-ionization detector (PID). Headspace vapor analysis was performed by first discarding a portion of the soil retained at one end of the sleeve to produce a headspace. The sleeve was then capped and the probe of the PID was inserted through a hole in the cap and into the headspace for analysis. The PID readings are recorded on the boring logs and in Table 1 (see section 3.5, Soil Vapor Monitoring). EB-8010-1 9112-E037.RPT 12 The second sample sleeve was immediately sealed with Teflon® film, capped, and placed on ice for transport to Mobile Laboratories, Inc. in Bakersfield, a California Department of Health Services (DOHS) certified laboratory. Chain of custody procedures were utilized for all samples collected. Sampling equipment was washed with TSP (tri-sodium phosphate) cleanser, and rinsed with tap water and de-ionized water prior to sampling, between sample intervals, and between borings to minimize the possibility of cross-contamination. Between soil borings, the augers were washed with TSP (Wi-sodium phosphate) cleanser, and rinsed with tap water. The rinsate was placed in two 55 gallon drums at the site. The borings were abandoned by backfilling with a cement-bentonite-sand slurry 2.2 Laboratory Analysis. Twenty-seven soil samples were submitted to the laboratory for analysis. Selection of soil samples for analysis was based on: a) observations and greatest PID readings of odorous soil, b) observations and PID readings of the first encountered sampling locations containing apparently uncontaminated soils, which would serve to define the lateral and vertical extent of contamination, and c) samples every five feet through the zone of impacted soil. The 27 samples were analyzed for total petroleum hydrocarbons (TPH) as diesel by the DOHS LUFT Manual Method, and the fuel constituent volatile aromatics, benzene, toluene, ethylbenzene and total xylenes (BTEX) by the USEPA Test Method 8020. 3.0 RESULTS OF ENVIRONMENTAL ASSESSMENT 3.1 Geologic Conditions Regional Geology: The site is located in the southern part of the Great Valley geomorphic province. The Great Valley is a north-south trending valley, approximately 400 miles long by 50 miles wide. Surface and groundwater in the San Joaquin Valley is derived predominantly from the Sierra Nevada mountain range to the east, and is transported by five major rivers, the southern most being the Kern River. The subject site is located approximately 4 miles south of the Kern River. The surface of the San Joaquin Valley is composed primarily of unconsolidated Pleistocene (1.6 million to 11,000 years ago) and Recent (11,000 years ago to the EB-8010-1 9112-E037.RlYr Arco ,.Oil and Gas Company present) alluvial sediments. Beneath the alluvial sediments are older, predominantly lake bed deposits. These lie unconformably on Mio-Pliocene marine sediments which extend to crystalline basement at approximately 20,000 feet. Site Geology: Geologic deposits in the study area include Pleistocene alluvial sediments of the Kern River Formation, which form a homocline dipping gently to the southwest. The deposits are alluvium consisting of poorly indurated and dissected fan deposits (CDMG, 1964). The depth to the regional unconfined aquifer is approximately 175 feet below surface grade beneath the site (Kern County Water Agency, Improvement District No. 4, 1990 Report on Water Conditions, February 1, 1991). No perched ground water is known to exist beneath the subject site. However, perched ground water is known to exist 1 and I/2 mile to the east at a depth of 20 feet in the abandoned Kern River channel to the ancient Kern Lake Bed (Kern County Water Agency, 1990 Water Supply Report, May 1991). 3.2 Subsurface Conditions Subsurface material encountered during drilling included artificial fill underlain by alluvium to the total depth of each boring. The artificial fill was encountered in the upper portion of all ten borings from the surface to depths corresponding to the contours, presented on Figure 3. The fill consisted of a dark gray, fine grained sandy silt with minor clay (ML). The dark gray color and septic odor appears to be the result of biodegradation of the plant material within the fill which was heavily wetted during the compaction operation. The high content of plant microscopic plant material within the fill is because the fill was derived from very near surface soils at the ARCO property. The alluvium was characterized by rust brown clayey silt (ML/CL) to a depth of approximately 20 feet. This is underlain by four foot zone of more permeable, tan, fine grained silty sand (SM). From a depth of 24 feet to 28 feet is a medium dense, olive brown silty clay (CL/ML). This is underlain by five feet of permeable, rust tan well graded sand (SW). From a depth of 33 feet to 39 feet is a good plasticity, brown, clay (CL). The deepest boring in this additional assessment terminated at a depth of 41 feet in an unconsolidated light tan fine- to coarse-grained sand (SW). Cross EB -8010-1 9112-E037.RPT 14 Sections AA', BB', and CC' are included as Figures 4 through 6, respectively. These cross sections present the relationship between the native lithology and the excavation backfill as well as interpreting the extent of concentrations of TPH as diesel in excess of 1,000 rog/kg. Previous Wilson and Associates borings were advanced, to a maximum depth of 95 feet and encountered additional low permeability zones including a clay from 42 to 45 feet, a substantial, good plasticity clay from 57 feet to 67 feet, a clay from 83 feet to 87 feet, and a clayey silt from 87 to 95 feet 3.3 Hydrogeology Groundwater was. not encountered in any of the borings drilled during this project. The depth to the regional unconfined aquifer is approximately 175 feet below surface grade beneath the site (Kern County Water Agency, Improvement District No. 4, 1990 Report on Water Conditions, February 1, 1991). No perched ground water is known to exist beneath the subject site. However, perched ground water is known to exist 1 and 1/2 miles to the east at a depth of 20 feet in the abandoned Kern River channel to the ancient Kern Lake Bed (Kern County Water Agency, 1990 Water Supply Report, May 1991). 3.4 Soil Vapor Monitoring Soil samples collected during drilling were monitored with a photo-ionization detector (PID) to evaluate organic vapor concentrations. The PID was calibrated with an isobutylene standard of 100 parts per million (ppm) and contained an 11.8 electron volt (eV) lamp, capable of detecting benzene (9.25 eV). Table 2- Soil Organic Vapor Concentrations, graphically presents the PID readings. Appendix A - Boring Logs, presents the PID readings as they were recorded in the field. -- EB -8010-1 9112-E037.RPT ~Arco 0~1 and Gas Company TABLE-2 SUMMARY OF SOIL ORGANIC VAPOR CONCENTRATIONS (values in parts per 'million) 5 150 200 150 250 20 10 175 150 ND 200 ND 15 200 100 ND ND 10 20 60 60 ND ND ND 25 100 30 ND ND ND 30 ND ND 5 220 300 240 400 150 10 175 170 200 150 ND t5 100 140 150 75 10 20 1500 600 500 125 20 25 300 400 300 110 ND 30 ND ND 20 ND 35 ,ND ND ND ND 40 ND ND: Not detected. The soil vapor concentrations detected in the soil samples show three distinct zones of organic vapors. The first is the zone of septic odors within the biologically degrading organic backfill. The second is the zone of diesel hydrocarbons in the interval from 20 to 25 feet below surface grade. The third is the underlying non detected zone beneath the diesel impacted soil. These field readings are collaborated by the analytical results presented below. EB-8010-1 9112-E037.RPT 16 3 Laboratory. Analytical Results Total petroleum hydrocarbons (TPH) as diesel, and the fuel constituent volatile aromatics were detected reaching a maximum concentration of 2,310 mg/kg at a I f lc d~pth of 20 feet in boring L-6 on the eastern lan of the excavation pit. TPH as' .I diesel at a concentration in excess of 1,000 nag/kg was detected in four of the twenty- seven samples, all of these samples were at the depths of either 20 or 25 feet below su~rface grade, and all of these samples were confined to borings L-l, L-5, and L-6. TPH as diesel in excess of 100 mg/kg was detected in two of the samples at a depth of 15~ feet, and one of the samples at a depth of 30 feet. The volatile aromatic benzene was detected at a concentration of 1.105 rog/kg in the sample from a depth of 20 feet in]boring L-6. However, benzene was not detected in excess of 0.68 mg/kg in any of thee other 27 samples and was not detected in 22 of the 27 samples. Regional Water Quality Control Board recommended guidelines for diesel, and th fuel constituent volatile aromatics, benzene, toluene, ethylbenzene, and total x~lenes have been calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality standards by a factor of 1,000 to account for attenuation due to site-specific parameters including vertical separation to ground water, soil lithology, fractures in subsurfaces, annual average precipitation, and any direct conduits to ground water. The recommended guidelines are 10,000 mg/kg tbr TPH as diesel, 1.0 mg/kg for benzene, 50 mg/kg for toluene, 68 mg/kg for ethylbenzene, and 175 mg/kg for total xylenes. Figure 3 present a map view perspective of the extent of concentrations of TPI-I as diesel in excess of 1,000 1 ma/kg. Figures 4 through 6 present cross section perspectives of the distribution of thle diesel hydrocarbons. Laboratory analytical results for ~he nine selected soil samples from the four b' T I 3 Summary of Analytical Results. Copies of the o~rings are summarized in ab e - analytical reports and chain of custodv documentation are presented in Appendix B Laboratory Analytical Results. ' E~-8010-1 9112-E037.RPT 17 TABLE-3 SUMMARY OF LABORATORY ANALYTICAL DATA (values in milligrams per kilogram) benzene .Xylene.s L-1 15' 40 ND ND 'ND ND L-I 20' 210 ND 0.775 ND 1.015 L-I 25' 1,360 0.290 1.015 ND 7.885 L-1 30' ND ND ND ND ND L-2 15' ND ND ND ND ND L-2 20' 20 ND ND ND ND L_2 25' 40 ND ND ND ND L~2 30' 50 ND ND ND ND L-3 20' ND ND ND ND ND L~4 5' 30 ND ND ND ND L-4 20' ND ND ND ND ND L-5 15' 200 ND ND ND 1.695 L-5 20' 1,380 0.680 1.215 ND 8.010 L-5 25' 500 ND 0.260 ND 3.775 L-5 30' ND ND ND ND ND L-6 20' 2,360 1.105 1.990 ND 9.660 L-6 25' 1~420 0.605 1.005 ND 7.225 L- 6 30' ND ND ND ND ND L-7 20' 440 ND 0.300 ND 3.775 L-7 25' 450 0.090 0.335 ND 2.995 L-7 30' 280 ND ND ND 0.760 L-7 35' 60 ND ND ND ND L-8 20' 610 ND 0.660 ND 1.010 L-8 25' 120 ND ND ND 0.905 L-8 30' 80 ND ND ND ND i L-9 20' 80 ND ND ND ND L- 10 20' ND ND ND ND ND A L NA 10,000 1.0 50.0 68.0 175.0 ND: None Detected at or above mimmum reporting level. NA: Not Applicable A L: Regional Water Quality Control Board recommended guidelines for contaminallts in soil. The recommended guidelines were calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality standards by a factor of 1,000 to account for attenuation due to soil composition and distance from groundwater. - EB-8010-1 9112-E037.RPT ~Arco. 0~1 ami Cu~ Compm~y 18 4.0 CONCLUSIONS The data obtained from the field operations suggest that soil impacted with gasoline hydrocarbons at concentrations in excess of 1,000 mg/kg exists at the subject site in an area limited to adjacent to the western and eastern flanks of the north end of the 'excavation pit. This zone of diesel impacted soil appears to be confined to an interval from 19 to 26 feet below surface grade. On the western flank of the excavation pit, the diesel impacted zone in excess of 1,000 mg/kg extends radially less than six feet from boring L-l, except in an easterly direction where this zone was previously excavated and removed. This results in an estimated volume of 17 cubic yards of diesel impacted soil in excess of 1,000 mg/kg remaining on the western flank of the excavation pit. No concentrations of diesel hydrocarbons in excess of 10,000 mg/kg are known to be present on the western flank of the excavation pit. On the eastern tlank of the excavation pit, the diesel impacted zone in excess of 1,000 mg/kg extends radially less than six feet from boring L-5, except in an easterly direction where it is Present in boring L-6 and likely extends to ten feet from boring L-5. The diesel impacted zone in not present to the west of L-5 since the zone was previously excavated and removed in that direction. This results in an estimated volume of 31 cubic yards of diesel impacted soil in excess of 1,000 mglkg remaining on the eastern flank of the excavation pit. The only detected concentration of diesel hydrocarbons in excess of 10,000 mg/kg believed to be present on the eastern flank of the excavation pit was that reported by the third party consultant during their Phase II assessment activities at a location adjacent to boring L-5 at a depth of 20 feet. This has resulted in an estimated volume of 4 cubic yards of diesel impacted soil in excess of 10,000 mg/kg remaining on the eastern flank of the excavation pit. However, ESE was unable to confirm the presence of TPH as diesel in excess of 10,000 mg/kg. The total estimated volume of diesel impacted soil with concentrations in excess of 1,000 mg/kg is estimated to be 48 cubic yards at the location of the underground fuel storage tanks on the ARCO property. Figures 3 through 6 present map view and cross section perspectives of the distribution of diesel hydrocarbons in excess of 1,000 mg/kg. The depth to the regional unconfined aquifer is approximately 175 feet below surface grade beneath the site (Kern County Water Agency, Improvement District No. 4, 1990 Report on Water Conditions, February 1, 1991). No perched ground water is EB-8010-1 9112-E037.RPT Arco .0i1' and ~a~ ComPanY known to exist beneath the subject site. However, perched ground water is known to exist 1 and 1/2 miles to the east at a depth of 20 feet in the abandoned Kern River channel to the ancient Kern Lake Bed (Kern County Water Agency, 1990 Water Supply Report, May 1991). Geologic deposits in the study area include Pleistocene alluvial sediments of the Kern River Formation, which form a homocline dipping gently to the south. The deposits are alluvium consisting of poorly indurated and dissected fan deposits (CDMG, 1964). Substantial clay content resulting from an overbank depositional setting was observed in the native soils penetrated by the ten borings advanced during this additional assessment,~ and the seven borings advanced during the original Wilson and Associates assessment which penetrated to a maximum depth of 95 feet below surface grade. These low permeability zones included a silty clay from approximately 24 to 28 feet below surface grade, a good plasticity clay from 33 to 39 feet below surface grade, another clay from 42 to 45 feet below surface grade, a substantial, good plasticity clay from 57 feet to 67 feet, a clay from 83 feet to 87 feet, and a clayey silt from 87 to 95 feet which was the deepest depth penetrated in the assessment borings. 5.0 RECOMMENDATIONS ESE recommends that the site be considered for closure. In ESE's professional opinion given the very limited volume of impacted soil which remains, the 150 feet of vertical separation between the last known impacted soil and the first known occurrence of ground water, the considerable clay content observed in the characterizations, an annual average precipitation in Bakersfield of 5.72 inches, and the proposed site use as a strip shopping center development with a high probability that the subject area will be capped by an asphalt parking lot, there is a very low probability of the remaining diesel hydrocarbons migrating to ground water at the location of the former tank, product line, and dispenser. Additionally, natural in-situ biodegradation will occur over time reducing the concentration of diesel hydrocarbons. Since the area above the diesel impacted soil is to be paved, it would be unlikely that the diesel hydrocarbons would migrate further due to water infiltration or other means, and the risk of surface emissions is minimal. EB-8010-1 9112-EO37.RPT *' Arno Oil m~d C-~ Compm~y 20 5.0 CLOSURE This report has been prepared for the exclusive use of the ARCO Oil and Gas Company, as it pertains to the location of the former fuel tanks at the former ARCO maintenance facility at the 4121 South H Street, Bakersfield, California. The conclusions and recommendations rendered in this report are opinions based on laboratory testing of soil samples collected during this project. This report does not reflect subsurface variations which may exist between sampling points. These variations cannot be anticipated nor can they be entirely accounted for even with exhaustive additional testing. All work has been performed in accordance with generally accepted practices in geotechnical/environmental engineering, engineering geology, and hydrogeology. No other warranty, either express or implied, is made. Thank you for this opportunity to be of service. If you have any questions regarding this report or the information contained herein, please contact this office at your convenience. Sincerely, EARTH SYSTEMS ENVIRONMENTAL, INC. Mark R. Magarg~e, CR.G.#4892 Senior Geologist Distribution: 3 - Mike Stahl/ Arco Oil and Gas Company 1 Bakersfield File 1 - San Luis Obispo File EB-8010-1 9112-E037.RPT Arco Qil and Ga~ Company 21 REFERENCES California Division of Mines and Geology, 1964, Geologic Map of California, Bakersfield Sheet. Kern County Water Agency, 1991, Water Supply Report, April 1990. California Water Resources Control Board, 1989, LUFT Manual Guidance Document. EB-8010-1 9112-E037.RPT Brook WHITE FIo~d EAST PANAMA Ro~d Earth Systems I _.z-- TITLE ./t ,,,'~.,~.,~ Figure , ~E. nv!r,,o, nmental, ~nc. I /-~.~'/K[~ ./--/lC: ~' . ~,_,_._,_~_~_ ,-,~ ~.-.-.-.-.-~-.-.- ~ _._~_._,_._,-~-. ? ~-, ~.~.,-. , ~~ ~/~/~ Environmental, Inc. A Mem~r of The EI~B Syslems Group 6701 UcDivitt Drive, Suite a Bakersfield, CA 93313 (8o5) 836-0901 JOB NO. S' / · Earth Systems ~ TITLE ~ Figure I ~ Environmental, Inc. I // ,--,,-,...., /'~,/ ~ /'~A~--/~,~I ~I 6701 McDivitt Drive, Suite B ~/~/ ~T~ ~"~T~~ ~ Bakersfield, CA 93313 ~~~/~ ~/~. (805) 836-090~ JOB NO. /5' Earth Systems Environmental, Inc. A MemDef of The £arlh Syslem$ G,'oup 6701 McDivit! Drive, Suite B Bakersfield, CA 93313 (805) 836-0901 FAX (805) 836-0911 TITLE CZ O: 5 - : dC TIO/V,,q-,4 ' Figure JOB NO. ~".~ - ~o/0-~ 25' L-/ Z-Z ~ -/o Earth Systems Environmental, Inc. A MemDe~' of The Earlh Syslems Group 6701 McDivitt Drive, Suite B Bakersfield, CA 93313 (805) 836-0901 FAX (805) 836-0911 TITLE ~'C T/OxY~-~ ' Figure 5 JOB NO. /_5" 35' Earth Systems Environmental, Inc. A Member of )he Earth Systems Group 6701 McDivitt Drive, Suite B Bakersfield, CA 93313 (805) 836-0901 FAX (805) 836-0911 85' TITLE CZ O_ 5 - T£C TIOIV C- C ' Figure JOB NO. ~',~' -~/0 -~ APPENDIX A Boring Logs I I -~'~ l~,-i I~ I ,,.. I ' I~ I '1~ I ............ "~' :~': ::':: .... "' I I I ! i i I17~ I%r~i'~ I I I i I i F t I I I i II i t I I i Ii I I I I I il - -- I I I I I II - - I I I I I II I I I I I Ii I I I I I Ii I i I I I II ' ' '''1' --' ~ I 1' I ~~ ,, I I I ' I I I I I II I I t I I I I I II ~/~,.~,.~_~~ ~~ ~, ~. ~,'l~r; ~C-~ ~ ~LAT~ L -'/ '.,. Proi~cl ~umb~ cu~,. , !s,~i'L-' ,.; . ,~,, .~,, Wi~LL. _-5 ~ ,~.. ' ° . ~ · SO~l:'l:)'~im{)i~:,I.': I I ' ~ ~ "' '1 I~ I ~, I I I I' I I I I I I ! i ~ ~ I! ! ~ I i i Il I i i i ~ i I I I i Il I I I I I J) ' I I I I I II I I I I I I I I I I II_ ._ ' " I I I I I I I ~ ~ ~ ~ I I I I I II I I I I I II I I I I I II I I I I I II I I I I I Ii I I I I I II I I I I I Ii I i I i I II i I I I ~ II I ! I I I II I I I I IJ I I I I I I Ij j I I I ~ ., ,,, i I I I I II i I I I I !1 I i I I I Il Pro ~eet Nu m be ~ ~ ~o/0-/ /~- ~1 WELL CONSTRU'CTIOIq GllF.,.'vl I CAb.., ~S~Sl I I I I I ' I~,i~- iii I i i il . i IW I /,~ iii I I I I II I I II I~' I I I II I I II I I II ! I I I I I I I I II I I I I I I II I I I I ! I I II i i I ~I LOG of. BORING I]~LATE ~',./'V 5~$.! I I I I I I I I I I I I I I I I I I I I I II I I I II '1 I I I I/¥~1~ ii'/ I II111, I I I I I II I II II II II II II II II II I L]~LATE .,/0,,/ I I II i I Il ~'~:~,~.~ ,' ~'.- ~'.~'~--.~,~,--,~ ~~,.~ ~ ~,~. J,~, Z'/~..-'.' E,~'(:;....,~.,., ,/'",'--',., ,~" ,,,~,,~:::;,- ~/z,/ ..~,.,~...~/-/'.~,'-'~'~,'-/" J L 0 G o f. El 0 R I N (S Pro,cc! Number:. ~,~'~/o--/ /z~-7.~/ _ ! I I I I~ I/~ d I I I I I il I I I I/~ I~ ~ ~ I I I I I 'i I I I I I II I I I I I II I I I I I II I I I I I II I I I I I II I I I I I II I I I I I II APPENDIX B Laboratory Reports and Chain of Custody Documents '3 Nevada Laboratory Results For : ARCO Facility 4121 South H Street Bakersfield, CA Sample Matrix ; Soils 5327 Wingfoot Drive ,,-' :. ,.- .',.-.~' .?~. ': (805)~,z ~,~u--:----- ' ' ...... ~' "~ '""'"~' ~''~ ~:'~":~'"L.~'~'~"~"~%~?~:'?~':''':,.~.:.:~':~ ~:~-: :. ...... ~' " Date Received : 1'2/7/91 Date Analyzed : 12/9/91 Analyst : J.S. Johnson Lab No. 910183 Benzene Toluene Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg mg/kg mg/kg L-1 ~15 L-1 ~20 L-1 ~25 L-1 ~30 L-2 ~15 L-2 ~20 L-2 ~25 L-2 ~30 L-3 ~20 QA/QC Spike Recovery ND ND ND ND 40 ND .775 ND 1.015 210 .290 1.015 ND 7.885 1360 ND ND ND ND ND ND ND ND ND ND ND ND ND ND 20 ND ND ND ND 40 ND ND ND ND 50 ND ND ND ND ND 79 101 73 89 79 Diesel Ail Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 *Analysis of Total Petroleum Hydrocarbons ; EPA 8015 Modified for Diesel *The TPH Method for Diesel is the Calif DOHS Recommended Procedure Certificate Number : E739 Certified Full Service On-Site Analytical Laboratories Neva'~la vv, ~, ~"'=n-'oo'Drive 5327 (805) 872-4750 Laboratory Results For : ARCO Facility 4121 South H Street Bakersfield, CA Sample Matrix ; Soils Date Received : 12/7/91 Date Analyzed : 12/9/91 Analyst : J.S. Johnson Lab No. 910183 Benzene Toluene Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg mg/k~ mg/kg L-4 ~5' L-4 ~20 L-5 ~15 L-5 ~20 L-5 ~25 L-5 ~30 L-6 ~20 L-6 ~25 L-6 ~30 QA/QC Spike % Recovery ND ND ND ND 30 ND ND ND ND ND ND ND ND 1.695 200 .680 1.215 ND 8.010 1380 ND .260 ND 3.775 500 ND ND ND ND ND 1.105 1.990 ND 9.660 2310 .605 1.005 ND 7.225 1420 ND ND ND ND ND 86 87 73 102 80 Diesel Ail Results Reported in Milligrams per Kilogram ND = Non Detectable ; EPA 8020 (.005 mg/kg) EPA 8015 Modified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 8020 *Analysis of Total Petroleum Hydrocarbons ; EPA 8015 MOdified for Diesel *The TPH Method for Diesel is the Calif DOHS Recommended Procedure Certificate Number : E739 J~/f~To~n~n, Chemist. -- Certified Full Service On-Site Analytical Laboratories Nevada (805) 872-4750 Laboratory Results For : ARCO Facility 4121 South H Street Bakersfield, CA Date Received : 1'2/7/91 Date Analyzed : 12/10/91 Analyst : J.S. Johnson Lab No. 910183 Sample Matrix ; Soils Benzene Toluene Ethylbenzene Xylenes Tot Pet Hyds mg/kg mg/kg mg/kg mg/kg mg/kg L-7 ~20 L-7 ~25 L-7 ~30 L-7 ~35 L-8 ~20 L-8 ~25 L-8 ~30 L-9 ~20 L-10 ~20' Drum Liquid QA/QC Spike % Recovery ND .300 ND 3.775 440 · 090 .335 ND 2.995 450 ND ND ND .760 280 ND ND ND ND 60 ND .660 ND 1.010 610 ND ND ND .905 120 ND ND ND ND 80 ND ND ND ND 80 ND ND ND ND ND ND ug/L ND ug/L ND ug/L ND ug/L ND ug/L 82 84 76 91 83 Diesel Ail Results Reported in Milligrams per Kilogram or as Stated Otherwise ND = Non Detectable ; EPA 602 (lug/L) EPA 8020 (.005 mg/kg) EPA 8015 MOdified for Diesel (10 mg/kg) Analysis of Volatile Aromatics ; EPA 602 and EPA 8020 *Analysis of Total Petroleum Hydrocarbons ; EPA 8015 Modified for Diesel *The TPH Method for Diesel is the Calif DOHS Recommended Procedure Certificate Number : E739 Certified Full Service On-Site Analytical Laboratories 5327WINGFOOT DRIVE CALIFORNIA · NEVADA · ARIZONA::..?.~": '" ~ · :,., BAKERSFIELD, CALIFORNIA87 2-4750 93306 ¢~:'.--~' (805) CERTIFIED FULL SERVICE ON SITE ANALYTICAL LABORATORIES PROJEC~ NO.: SITE NAME: /'~ o ~ "? ' .':', ~/~/~ SAMPLE ~ /~ - "~ ........ ~MP SAMPLE O DATE TIME MATRIX SAMPLE LOCATION DESIGNATION ID. NO. ~/~ II:~ /. ~ ~ ~ ~ / _;~¢'. .. :,....: ,.,... :.. RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISH ~, BY (SIGNATURE) DATE TIME RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE} DATE TIME RECEIVED RELINQUISHED bY: (SIGNATURE) DATE TIME REC~I~E~ FOR LABORATORY BY DATE TIME REMARKS: · "; / / /.,1 ............... . . .." .:?'," ..,;:. ...., :;:?: 5327WINGFOOT DRIVE CALIFORNIA · NEVADA · ARIZONA '.~: .... '' .... BAKERSFIELD, CALIFORNIA 93306 : ~ .. (805) 872-4750 CERTIFIED FULL SERVICE ON SITE ANALYTICAL LABORATOR!,ES ' SAMPLE ~ /SAMPLE LOCATIO~ESIGNATION o RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME , RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED FOR LABORATORY BY DATE TIME REMARKS: · '" . . 5327W~N6FOOT DRWE CALIFORNIA · NEVADA · ARIZONA iY. BAKERSFIELD, CALIFORNIA 93306 (805) 872-4750 CERTIFIED FULL SERVICE ON SITE ANALYTICAL LABORATORIES PROJECT~.,~.NO.:~/' ~J./ SITE.,.~2/._~G <::~NAME:/~::~/-~'~ ~ ~ ~ [" SAMPLERS (SIGNATURE): SITE ADDRESS · < REMARKS SAMPLE ID. NO. DATE TIME COMP GRAB SAMPLE MATRIX SAMPLE LOCATION DESIGNATION ~~ !~:~~t g-7 ~ z~ / RELINQUISHED BY: (Sl6NATURE) DATE TIME RECEIVED BY (Sl6NATURE) RELINQUISHED BY (Sl6NATURE) DATE TIME ~fCflVf~ tf RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RECEIVED ~ELI~UlS~fB Df: (Sl6NATURE) DATE TIME REOEIVEB FOR LABORATORY BY DATE TI~E RE~ARKS: " 5327'WINGFOOT DRIVE CALIFORNIA · NEVADA · ARIZONA BAKERSFIELD, CALIFORNIA 93306 (805) 872-4750 CERTIFIED FULL SERVICE ON SITE ANALYTICAL LABORATORIES SAMPLERS (SIGNATURE): ;SITE ADDRESS . g ~, REUARKS SAMPLE / ~ SAMPLE / O i ;~ , . , ~,~., :.~;, ..~ RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RECEIVED RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED BY (SIGNATURE) RELINQUISHED BY (SIGNATURE) DATE TIME RELINQUISHED BY: (SIGNATURE) DATE TIME RECEIVED FOR LABORATORY BY DATE TIME REMARKS: · CO'Oil*and.Gas' Company District, ,.' Box 147'; * kersfield, California93302 ~one 805 321 4000 October~2~'~990 Mr. Joe Canas Hazardous Materials Specialist Kern County Environmental Health Department 2700 "M" Street, Suite 300 Bakersfield, California 93301 Subject: Site Assessment - South "H" Street Location Dear Mr. Canas: Attached is the Site Assessment for ARCO's South "H" Street and White Lane location prepared by Wilson and Associates. Seven soil borings were performed to define the lateral and vertical extent of the soil impaction. Based on the results of this assessment, the recommended corrective action for this location is excavation of the soil and surface bioremediation. If you have any questions or need additional information, please don't hesitate to contact me at (805) 321-4307. Sincerely, Michael A. Stahl Senior Environmental Coordinator file # 4-288.2-1 ARCO Oil and Gas Company is a Division of Atlantic Richfield Company t'S0N & ~.~IVIL ENGINEERING SURVEYING SITE ASSESSMENT STUDY AT ARCO SERVICE STATION 4121 SOUTH 'H' STREET BAKERSFIELD, CALIFORNIA PRESENTED TO; MR. MIKE STAHL PRESENTED BY; WILSON & ASSOCIATES, INC. JULY, 1990 1701 WESTVVlND DRIVE · SUITE 113 · BAKERSFIELD. CA 93301 lS0b--] 32;~84S0 · I:AX 18051 323~7~3 2. 3. 4. 5. 6. 7. 8. 9. Table of Contents Executive S~mmary Background Assessment Activities Analytical Results Site Geology Conclusions Recommendations Limitations Signatures Page 1 2 3 4 5 6 6 6 7 Exhibits 1-7 Table 1 Appendix A Appendix B Maps and Cross Section Diagrams' LUFT Risk Analysis Boring Logs Analytical Results 1.0 Executive Summary_ Arco Oil & Gas Company represented by Mr. Mike Stahl contracted with Wilson &'Associates, Inc. (W&A) Go perform .a Phase I Site Assessment at the Arco Service Station, 4121 South "H" Street, · Bakersfield, California (Exhibit 1). This assessment was focused on the area where three underground fuel tanks, one solvent tank, two dispenser islands and product lines had been removed and previous Laboratory analysis had indicated soil impaction at the south end of the 5,000 gallon tank at 6 feet reaching a maximum of 22,000 mg/kg for fuel hydrocarbons as diesel, and a maximum of 140,000 mg/kg for fuel hydrocarbons as diesel at 6 feet beneath the west end of the north dispenser island. The current assessment included soil borings, sample collection, and analyses for fuel hydrocarbons as diesel, volatile aromatics benzene, toluene, ethylbenzene, total xylenes (BTEX), and volatile organics (including chlorinated hydrocarbons). On June 7, 1990 eight soil samples, and June 11, 1990 nine soil samples were submitted to National Toxicology Laboratories, Inc. (NTL) for analysis using EPA Method 8015 (purge and trap for diesel) for all samples, EPA Method 8020 (BTEX) for seven samples and EPA Method 8240 (volatile organics) for ten samples. Field screening detected compounds in twenty~, seven of the sixty nine samples screened. Four potential sources were assessed. Three were believed to be diesel impacted soil. The fourth involved a petroleum based solvent. The first diesel source at the south end of the 5,000 gallon tank was found to be confined to less than 26 feet in depth and a radius of less than 17 feet. The second diesel source at the northwest dispenser was found to be confined to less than 36 feet in depth and a radius of less than 12 feet. This results in an overlap with the source one impacted soil forming a continuous volume of impacted soil. The third diesel source at the southwest dispenser was found to be confined to less than 15 feet in depth and a radius of less than 8 feet. This results in an overlap with the second source of diesel impaction forming a single continuous volume. The fourth source involves possible solvents observed below the solvent product line. This assessment included analysis for volatile organics using EPA Method 8240 and did not detect any chlorinated hydrocarbons. What was detected appears to be a high naphthalene solvent commonly referred to as refinery waste cut. This substance contains a variety of volatile aromatics which were also commonly present in older diesel fuels like 1,2,3 trimethylbenzene, isopropyltoluene, and xylenes. The fourth source of impacted soil is less than 25 feet in depth and less than a radius of 30 feet. This results in a significant overlap with diesel sources one and two. The depth to the water table in the area is estimated at 175 feet (Water Supply Report, Kern County Water Agency, May 1989). No ~groundwater was encountered in any of the borings advanced for this assessment which penetrated to a maximum depth of 91 feet below the surface. The alluvial Quaternary sediments that were encountered by the borings were comprised of 5 to 20 feet layers of well to poor graded very fine to coarse grain silty sand, interbedded with 3 to 15 feet layers of clayey silts to silty clays to the total depth penetrated in the borings. Given these site characteristics a score of 50 for the LUFT Manual Diesel leaching potential risk analysis is interpreted . This corresponds to a low potential of leaching to groundwater and action level concentrations of 10,000 mg/kg for diesel, 1.0 mg/kg.for benzene, and 50 mg/kg for toluene, ethylbenzene and total xylenes. Constituents of the high naphthalene solvent have action level concentrations corresponding to an attenuation factor of 1000 applied to water quality guidelines found in A Compilation of Water Quality Criteria and Standards, California Regional Water QualitY Control Board, Central Valley Region, Jon Marshack, 1988. Concentrations of compounds detected in the soil exceed Federal, State, and local regulatory limits and deem that remedial measures are necessary. Given the site conditions, depth of contaminants, chemical constituents, and available land at the site, on-site bioremediation is the recommended course of action. 2.0 BACKGROUND The Former Arco Maintanence Facility is located at 4121 South "H" Street, Bakersfield, California as shown on Exhibit 1. 2.1 FACILITY DESCRIPTION The facility is shown to scale on Exhibit 2. The location was a maintenance facility. Previously located at the site was one 10,000 gallon underground gasoline storage tank, one 5,000 gallon underground gasoline storage tank, one 1,000 gallon underground diesel storage, one 1,000 gallon underground solvent storage tank, product lines and two dispenser islands. 2.2 PROJECT HISTORY On December 21, 1989 Pinnacle Environmental Corporation removed the four (4) underground storage tanks from the above described property location, under permit issued by County (permit number 310063). Soil samples were collected from beneath the removed tanks, product lines and dispensers. The samples were analyzed for total petroleum hydrocarbons (TPH) and volatile aromatics (BTEX). The analytical results indicated concentrations in excess of State and County guidelines. Based upon these results, the county determined that an unauthorized .leak may have occured and, site characterization would be required. 2 On March 9, 1990, the County issued a letter stating that. the extent of contaminants beneath the former tank, dispenser'islands, and product line must be determined. Arco Oil & Gas Company contracted with Wilson & Associates to implement a site characterization study and prepare this report of findings. 3.0 ASSESSMENT ACTIVITIES Field Activities for this phase included advancing seven (7) soil borings on June 7, 1990 and concluded June 8, 1990, to assess the lateral and vertical extent of soil impaction from four potential sources (Exhibit 2). To assess the first source boring TH-1 was advanced through the center of the southern end of the former 5,000 gallon underground storage tank. TH-1 was advanced to a depth of 41 feet assessing the vertical extent of impaction. Boring TH-2 was advanced 18 feet to the south of TH-1 assessing the lateral limit. Boring TH-3 was advanced 20 feet west of TH-1 to a depth of 36 feet to assess the lateral limit. Boring TH-2 advanced to a depth of 91 feet was also used to assess the vertical extent of the potential solvent product line source. Boring TH-1 was also used to evaluate the lateral extent of this volatile organic impaction. Boring TH-4 was advanced 22 feet southwest of TH-2 to a depth of 60 feet assessing the lateral limit. Boring TH-6 was advanced 26 feet south of TH-2 to a depth of 50 feet assessing the lateral limit. Boring TH-4 was also used to assess the vertical extent of diesel soil impaction from the northwest dispenser. Boring TH-6 was also used to assess the lateral extent of this diesel soil impaction. Boring TH-7 was advanced 17 feet west of TH-5 to a depth of 35 feet assessing the lateral limit. Boring TH-5 was used to assess the vertical extent of diesel soil impaction from the southwest dispenser. Boring TH-6 was used with Boring TH-7 to assess the lateral extent of soil impaction from the southwest dispenser. 3.1 BORING METHODS The borings were advanced using a Mobile Drill B-55 rig with a ten (10) inch hollow stem continuous flight auger in accordance with ASTM Method D1452-80 for soil investigations and sampling by auger borings. The augers were steam cleaned prior to drilling each boring. The lithology and other pertinent data were recorded on a field boring log in accordance with Method D2485-84 for visual description and identification of soils. 3 Cuttings and other spoil from the borings were placed in appropriate D.O.T. approved 55-gallon drums and verified with analytical results to be contaminated. A written plan will be submitted by the facility operator to the County for their approval before treatment and or disposal occurs. Boreholes assessed to be contaminated were filled with a cement slurry. 3.2 Soil Sampling Soil samples were collected through the auger in 2-inch brass sleeves placed in a split spoon sampler and driven into the soil 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 were cleaned and rinsed using a low-phosphate detergent solution followed by immersion in deionized water rinse prior to each Use. Soil samples were driven at five foot intervals in each boring. The blow counts, recovery, and lithology were recorded on the field logs (Appendix A). Lithology was described in accordance with ASTM procedure D2488-84 (Standard Practice for Description and Identification of Soils). one brass sleeve with soil from each interval was capped, sealed, labeled in accordance with EPA protocols, recorded on a Chain of Custody Form, placed in a cooler at 4 degrees centigrade or less, and transported to NTL with the Chain of Custody for the specified analyses. 3.3 Field Screening of Soil Samples Soil samples were collected using three six-inch brass tubes installed inside a split-spoon sampler. The middle sample tube was immediately caped and stored in an iced cooler upon collection. The bottom tube was used for lithologic description, and the top tube was used for field screening. The material from the top tube was capped at approximately 50 percent capacity. A headspace reading was collected at this time and noted on the boring log. 4.0 Analytical Results Seventeen soil samples were analyzed by NTL a state certified laboratory, for total petroleum hydrocarbons as diesel by the California DOHS Method. Seven samples from borings TH-l, TH-3, TH- 5 and TH-7 were also analyzed for volatile aromatics (benzene, toluene, ethylbenzene, and total xylenes (BTEX)) by EPA Method 8020. Ten samples from borings TH-l, TH-2, TH-4 and TH-6 were analyzed for volatile organics by EPA Method 8240. Results of samples analyzed for fuel hydrocarbons as diesel and the fuel constituent volatile aromatics indicated concentrations dropping rapidly with depth and none exceeding the 140,000 mg/kg of fuel hydrocarbons as diesel detected during the tank pull at six feet below the northwest dispenser. Volatile aromatics were either 4 non .detected or at concentrations below regulatory limits beneath the three potential diesel sources. However, laboratoryresults of samples associated with the potential solventsource~'~ · elevated concentrations of naphthalene reaching~~"~ in boring TH-2, and elevated concentrations of~ ~' ~ -~ latile aromatics including toluene reaching 10.6 mg/kg at 20 feet in boring TH-6~ ethylbenzene at 18.5 mg/kg at 20 feet in boring TH-6, xylene reaching 171 mg/kg at 20 feet in boring TH-6, 1,2,4, trimethylbenzene reaching 16.6 mg/kg at 20 feet in boring TH-4, 1,3,5, timethylbenzene reaching 3.6 mg/kg at 20 feet in boring TH- 4, ethylmethylbenzene isomer reaching 180 mg/kg at 20 feet in, boring TH-6, octane reaching 110 mg/kg at 20 feet in boring TH-6, undecane reaching 92 mg/kg at 15 feet in boring TH-2, and dodecane reaching 52 mg/kg at 15 feet in boring TH-2. These compounds could. be part of a high naphthalene solvent commonly referred to a refinery waste cut. These volatile aromatics are also commonly found in older diesel fuels. No chlorinated hydrocarbons were detected using this gas chromatograph/mass spectrometer method with detection limits as iow as 5ppb. The three areas of diesel impacted soil overlap and form one continuous volume. The waste cut impacted soil overprints the diesel impacted soil and contains many similar volatile aromatic compounds. Cross section diagrams have been developed and are included as Exhibits 4 through 7. They include the concentrations of the chemicals analyzed. Table 1 presents a LUFT Manual diesel leaching potential risk analysis. Wilson & Associates estimates the score to be 50 points which corresponds to a low potential of leaching to groundwater and action level concentrations of 10,000 mg/kg for diesel, 1.0 mg/kg for benzene, and 50 mg/kg for toluene, ethylbenzene, and total xylenes. Constituents of the high naphthalene solvent have action level concentrations corresponding to an attenuation factor of 1000 applied to water quality guidelines found in A Compilation of Water Quali~y Criteria and Standards, California Regional Water Quality Control Board, Central Valley Region, Jon Marshack, 1988. Of these compounds detected by EPA Method 8240, only naphthalene is listed in Marshack under EPA criteria at 620 mg/kg. 5.0 Site Geology The sediments underlying the site are quaternary alluvial deposits which consist of unconsolidated, clays, silts, sands, and gravels (Calif. Div. of Mines and Geol., 1971). The cross sections included in this report present Wilson & Associates interpretation of the study area stratigraphy. The depth to groundwater has been estimated at approximately 175 feet below the ground service (Water Supply Report, Kern County Water Agency, May 1989). The Alluvial Quaternary sediments were comprised of 5 to 20 foot layers of well graded to poorly graded fine-to coarse-grained sands interbedded 5 with 5 to 15 foot layers of clayey silts to silty clays to the total depth penetrated in the borings. 6.0 Conclusions Concentrations of diesel and volatile aromatics in excess of regulatory guidelines have been detected-in the soil. No chlorinated hydrocarbons were detected in the ten samples analyzed by EPA Method 8240 despite being indicated in the tank removal laboratory results using EPA Method 8020 with a gas chromatograph only. None of the other volatile aromatics detected in the presumed high naphthalene solvent are listed in the Marshack document. 7.0 Recommendations Based upon the results of the investigation three alternative courses of action are presented for the site: no action, excavation and disposal, or excavation and on-site treatment. The no action alternative is appropriate if the concentrations present are of very low risk to health and the environment as prescribed by federal, state, and local regulations. The site contains concentrations in excess of these regulatory limits. No action is not the recommended alternative at this site. The diesel and waste cut impacted soil could be excavated and disposed of at a solid waste facility. This alternative is the most costly choice and does not alleviate liability for the soil once it has been relocated at the disposal facility. The diesel and waste cut impacted soil could be excavated and treated on-site using bioremediation. This is a cost effective alternative and appears well suited for this site given the available land and concentrations of diesel and non chlorinated volatile aromatics in the soil. Excavation and on-site treatment is the recommended alternative. 8.0 Limitations Wilson & Associates 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 art. Judgments leading to conclusions and recommendations are generally made with limited knowledge of the subsurface conditions present. No warranty expressed or implied, is made. 9.0 Signatures This report of Findings was prepared by: Mark Magargee, R.G. #4892 Senior Hydrogeologist Registration Expires 6/30/92 This Report of Findings was reviewed by: Philip Goalwin, R.G. #4779 Principal Hydrogeologist Registration Expires 6/30/92 '7 Packinll I.I lA ~ible Orchlrd Illth Srh ! ,fiiFh I'~! ! ~lliJ I Lj II II ,' '~ II '. '.. = .... -. ..7 I~/ILS0,1~ I~ ASSOCIATES I?OI Weslwlnd Drive Sulle 113 Bokersfleld, Collfo[nla 93301 Telepllone: (805) 323-6460 FAX 323-4]'23 TIIle VICINITY MAP ~XIIIBII' 1 Job No. WHITE LANE FoR~ER D-rsp~Ns~ RS ~, zq° >~. '~G' > BUILDING N Sc/~LE 1" · 20' BORING W,LSO, a ^ssoc.~^~Es ~ T,,,. ][x,,,,,,'I 1701 Weslwind Drive Sulle I1.tll · Ii 2 .,,,,,,,,,,.;,',,.,:,.,,,..,,.,,, ,.,~.o, IIBOREHOLELOCATION! ~.1,pI,o..: (005) 3z3-e4eo MAP II cay -~ox_d?ox JJ ·.,, .-- jjJol, ilo. WHITE LANE BUILDIWG ScaLE 1", 2o' · BORIN~ LocAT~o 'WILSON ~ ASSOCIATES I?01 Weslwind Drive Suile 113 Bukersfleld, Callfornlo 93301 Telephone: (805) 323-6460 FAX 323-4723 TIIle MAP OF IMPACTION WITH 0R088 8E'CTION LOCATION8 £XHIBll' 3 Job No. A ~fi~T UoR.TH ,, T~P ~ lq .6 L Z~z'F oF -'1 DIESEL > 50 ppm SOUTH SCALE 1" = to' o BoI~II4G SAMPL~ LOC Al IoN u 'l'Al, ll<, pULL :SAmeLE LOCATION , I, 0' We$1wlnd Drive I ~; ';' ,,:,IIcROS'S-SEC_T_JON A-A' B(]l~[~ll~hl, California 9:33OI wn'u OO~CE~'m,",T~O~e OF Telephone: (805) 323-6460 IN.PP.M . FAX 325-4723 I EXHIBIT A THO NI EAsT tJo P,.T H 5P ---i LHD $~ Al .W._JLS_~_~ _~ _ASS_OG!ATE~_S I?01 Weslwlnd Drive Sulle 113 Bakerelleld, California 93301 Telephone: [805) 323-6460 TIIle GROSS SECTION A-A' WITH CONCENTRATION8 OF VOLATILE ORGANIC8 · BENZENE IN PPM EXlIIIII'I' 4b Job Ilo. A 'pIG gl -SM ~A~T IJUoF,.TH .ND C,~. SOUTH cjc,RL E :t" = ~o' .LoCATIoN TAUK POLL ~mPLE WJLSON _~ As_SOClATE~_S_ 1701 Weslwlnd Drive Sulle 113 Bokerslleld, Collfornlo 93301 Telephone: (805) 323-6460 CAV ~,9 ~l-- 4773 TIIle CROSS SECTION A-A' WITH CONCENTRATION8 OF VOLATI.E ORGANI08 TOLUENE IN PPM EXIIIIII'I' 4c Job Ilo. A F__fi CST I~oI~.TH 1-1t-1 C~ A~ SOUtl-/ BoRItl~ SA/~PLE .LOCATION T'A/,JK POLL SA~IPLE L OC~TioN IW..jILS..L~ _~ A_s_8OC!ATF~ 17OI Weslwind Drive Sulle 113 Bakersfield, California 93301 Telephone: (005) 323-6460 TIIle CROSS SECTION A-A' WITH CONCENTRATION8 OF VOLATILE ORGANIC8 ETHYLBENZENE IN PPM EXIIIliI'I' 4d Job A r.=A~T tdoKTH NP I~L~jp A/ S~.uTH WI~ B ASSOCIATES 17OI Weslwlnd Drive Sulle 113 Oaker611eld, California' 93301 'l'elephone: (805) 323-6460 TIIle CROSS SECTION A-A' WITH CONCENTRATIONS OF VOLATILE ORGANIC8 XYLENE(TOTAL) IN PPM EXIIIIII'I 4e Job Ilo. A NP Eft,ST ItJoR.TH r4L A/ SCALE 1" = ?.0 o BoRII, IG S,R~PLE .LOCATI'OH la 'f'AHK PULL L. OCAI'tON r~LSO~ ~ .A.S$OCIATE~_8 II' Title f~o, w. tw.,,f ..~,,o ~"l*' *f~IICROSS SECTION A A f]okerslleld, California 9~301Il .- · Il WITH CONCENTRATION8 OF VOLATILE ORGANIC8 l'elephone:(805) 323-6460 IIISOPROPYLBENZENE IN PPId EXIIIilI'I' 4f Job Iio. A ~-~T lYof~TH ND WILSON _8, _AssocIATF~_s 17Ol Weslwlnd Drive Sulle 113 8okerslleld, California 93301 Telephone: (805) 323-6460 Knv '~P3-4723 Tllle A/ CROSS SECTION A-A' WITH CONCENTRATION8 OF VOLATILE OREIANIC8 iN iIppM ........ t',2;4'-TR IM ETHY LBENZENE E. XIII III1' 4g lo' A Al SOUTH SCALE 1": ~o' o BORING LOCAT[ot4 ~ 'I'A~JK POLL ~mPLE L 0 C~T~o WlL$O.~ _~ ASSOC_!ATE-~- 1701 Weslwlnd I')rlve Sulle 113 13nkerslleld. C.Ilfornlc~ 93301 Telephone: (1305) 323-6460 Tille CROSS SECTION A-A' WITH OONOENTRATION8 OF VOLATILE ORGANIC8 NAPTHALENE IN PPM EXIIIIIII' 4h Job Ttt-I IlOI weslwind Drive 5ulle 113 Bakersfield, California 93301 Telephone: (805) 323-6460 FAX 323-4723 ............. CL B' ,.~:)u]-H I~ ~5'T 'TH-7 ~D LI/~T:T OF D'ZESEL~ 50 ?pm SCALE 1"= ~o' o BoRIflG SAMPLE LOCAl[oN u 'I-A~,IK POLL ~mPLE L OCd~TIoN CROSS SECTION B-B'II 5a I .... WITH CONCENTRAiTNiOpNp8 ~F TPH A, DiEBEL il Job I/,~...] '~voR'rH TH-I Sp "-. £L ~L. ND SCALE 1'=~o' o BORING SAMPLE LOCATION a T'AIJK PIJLL ~AmPLE L. 0 C:F~T~ o N '~v~N _~ 4ssocmAT~_s 1701 Weslwlnd i)rlve Sulle 113 Bakersfield, California 93~01 Telephone: (805) ~25-6460 FAX 323-4'/23 TIIle CROSS SECTION B-B' b EXHIBIT WITH CONCENTRATION8 OF VOLATLE ORGANIC8 II .... : ..... ,...z?_. ,=...~.:y_ ..................... !?~ 0 'AIORTH Ttt -I ~D hAL /ID BI ~L ~D SCALE 1": to' o BoRIflG SAMPLE L 0 C AT TO~ a 'rA~IK PgLL SAMPLE L 0C~'r~oN il TIIle I """° ~'~ CROSS SECTION B-B' EXItlBIT r~lL$O~ _0, ASSOCIATES_ I101 Weslwlnd Drive 50 Bakersfield, California 93301 /!Jobllo. WITH OONOENTRATION8 OF VOLATILE ORGANIO~ Telephone: (805) 325-6460 TOLUENE IN._PPM ~'~' '~?.t-4723 Ttt-I fid CL GL. ~L ND SCALE 1"= tO' o BORING Sf~MPLE LOCATTO~ a TA/4K POLL 5AMPLE 1701 Weslwlnd Drive Sulle I1~ D.ker~lleld. C~llfornla 93301 Telephone: (805) 32~-6460 FAX 323-4723 CROSS_ SECTION B-.B,'il 5d I ,,vote-tH lid WlLSO~ D __A_550c_!ATFS_ 1701 Weslwlml Drive Suile 113 Bakerslleld, California 93301 Telephone: (805) FAX Ttt -I Ct- TIt-;' TH-q ' ~ ---. I..~o I~.OOo 2 CL. ~L /VD TIIle I CROSS SECTION B-B' 323-6460 32~-472~ EXHIBIT 5e WITH GONGENTRATION8 OF VOLATILE ORGANIG8 XYLENE(TOTAL) IN PPM Job Ilo. AIORTH TH-i WILSON ~ .ASSOCIATES I?01 Weslwlnd Drive Sulle 113 Bakerslleld, California 93301 Telephone: (805) 323-6460 FAX .323-4723 ;":i £L NoKTtt £/~ 51- SOUTH ~d~5-r 'Ilt'7 SCALE 1"-- ~o' L 0 C P,'I' [OIq U 'FA~,IK POLL .~qmPtE Tille ! CROSS SECTION B-B' EXHIBIT 5f WITH CONCENTRATION8 OF VOLATILE ORGANIC8 180PROPYLBENZENE IN PPM Job Ilo. i *od .l ' ~vO~TH Tti-I A/D CL .... SCALE :1.' = ~o' o BoR[14G SAtRPLE LOC,RTl'ON a 'rA~,lK PULL L 0 ~,T'm ~ '~ILSO/~J _& ASSOCIATES 1701 Weslwlnd Drive Sulle 113 Bekerdleld, California 93301 Telephone: (805) 323-6460 FAX 323-472.t TIIle jj EXHIBIT j CROSS SECTION 5g WITH CONCENTRATION8 OF VOLATILE O AN Il I IH PPU Il Job ,o. I - 1,2,4-TRIMETHYLBENZENE ll,--------I 10' Io6-1 TH-I ~D .ozG. 5P CL A/D CL .'"' :ND ,o~z5 SCALE 1"= ~o' o BaR[fIG SA/APLE LOCAT/O~/ L O C~T~o N WILSON ~ ASSOCIATES I101 Weslwlnd Drive Sulle 113 Bakerllleld, California 93301 Telephone: (805) 323-6460 FAX 323-4723 CROSS sEcTION 5h EXHIBIT - II WITH CONCENTRATIONS OF VOLATILE ORGANIC8 II Job Ilo. .... PPM ... NAPTHALENE IN _ . -~ ............... _ .... C I0' GO~ 7O mL NP LIMIT OF DzES~I y 5o~fr~ ,~o, w..,~.,.., o.,- s.,,., ROSS SECTION C- 6 EXIIIlll I' Bokerslleld, C.ll[ornlo 93301 Telephone: (005) 323-6460 FAX 323-4723 WITH CONCENTRATION8 OF TPH A8 DESEL Il Job 'ilo. IN PPM . -- - * . ' ..': ~.~-.,..,..~ ..,,.~u.~.;.,..,.:.~,.,~ .~ -- '~:.-. :- -~ D bJe5T D/ - L]:A~IT oF DIESEL ) 50 ppm EXIIIIIII' 7 Job lie. LEACtlING POTENTIAL ANALYSIS FOR DIESEL USING TOTAL PETROLEUM IIYDROCARBONS (TPil)AND BENZENE, TOLUENE, XYLENE AND ETHYLBENZENE (BTX&E)" - ' S SCORE S SCORE S SCORE SITE C 10 PTS. C 9 PTS. C 5 PTS. FEATURE O IF CON- O IF CON- O IF CON- R DITION R DITION R DITION E IS MET E IS MET E IS MET Minimum Depth to > 100 51-100 25-50\! Ground Water from the l0 Soil Sample (feet) Fractures in subsurface None Unknown Present (applies to foothills or mountain areas) l0 Average Annual < 10 10.25 26-40\_2 Precipitation (inches) Man-made conduits which None Unknown Present increase vertical migration of leachate Unique site features: None At least More than recharge area, coarse· one one soil, nearby wells, etc. COLUMN TOTALS RANGE TOTAL PTS. 49 pts. or more 41 - 48 pts. '40 pts. or less MAX. ALLOWABLE 1/50/50/50 .3/.3/1/1/ NA\3 BTXE I.EVELS (PPM) MAX. ALLOWABLE 10000 1000 100 TPH LEVELS (PPM) \! \2 If depth is greater than 5 ft. and less than 25 ft., score 0 points. · If depth is 5 ft. or less, this table should not be used. If precipitation is over 40 inches, score 0 points. Levels for BTX&E are not applicable at a TPH concentration of 100 ppm. APPENDIX A ,-, WELL ~.,, z d~ SOIL:DESCRIPTION , ~ t ~ ~'~'ii i i ''l il'I' ". i I " -- I I I i i I ..... i ! 'i ! 'l i I I I I 'i 'i "i '1 i I ~.~,.. ! '~ , i , "i, I i iSso i~ I~ , I ! i I ~ ii ,, I I I I i ii i i i I I i ! I Ii i 'l I i I II i I i ~ ~ ' i .,.I I I I Ii i ! ~ " -- ~ ! I .... I I I i i '' "'i , i il .. ~ I ~il I I I il' , i II i I I ~ ! I i I I i II ~RCo / 5oofL "H" ~ield L 0 G o f. B 0 R I N G ~ ..... ,/_/.. TH-1 ,.../.~ / CO~ST~UCr'O~ ¢ ~' S~. ~ " ~ "'~ t I ! 'i :t I I'~-' ' · '-'[ -i ~ I i i "1~ ~ ~ I i''' ' I I i Ii , "J i l' "~ i ! ~ i~ ~ " - i '1 I i I II i I J uP i %91 ~ I ~, ~.. Ioo~' n, ~f~, ~ o~o~ ' i i ~ 'i ~ ~ ,. i I ~ i ,I J~ - - - i J I I I Ii i _~ ~ ~ ~ i - - J I .... ,J I i J <' I I I ~,,~, ~/~1~. T~ - ~ ~.,. I o~ ~ WELL : ~,,~ e~e, - .a 05 ~ "' s. ., z: ainu $OIL.DESCI~i'P. TION CONSTRU~IOH s' ~* ~ o ~ ~ , i I I I i I , i I I i II "i i i 'i ii I I i i il I I~ I~! ~.1 ..... i i i ~ I~ --- I i ,'1 '1 il i I I i il , "I i u~ 1%d ~ g I " i i I I . I ! i I ii I I i ....., ' "1 RRco/Sooth r 0 G o r. O 0 R IN G ' ' T~ -2 J' WELL COI,ISTRUCTiOi'I SOIL-DESCRIPTION ML I I I I I I .1. '1 I I I I I ML ML CL LOG of. BORING T -s PLATE WELL COI,ISTRUCTiOI'I '1 .! I I I I I I I I I I I I _.___j I ARco / ~o~" IPLE ~ -' n SOILLDESC--RIP,TIOH ~ j i ~ ~ 0~. ' ~ ' Dr~t: ~ ~%~ PLATE LOG of. BORING T~-~ ,...~.,~ ~I/ELL COHSTRUCI'iOI'I Labo~ SW SOIL DESCRIPTIOH. C_L. I I I I I I I I I I fieco / So~," OG of. BORING · TH_Li "',,Z of'Z_ PLATE WELL COI,IS'I'RUC'I'iOi'I SOiL 'DES¢-~iP?nO CL I I I I I I I ~ - I I I I I I I I I I I II I II ~L ML C.L LOG of. BORING TI4-S PLATE WELL COI,IS'I'RUCTiOI'I SOIL DESCRIPTION- CL , i', Ii ' I I I eL CL I LOG of. BORING ] WELL ¢Oi, ISTR UCI'IOI'I SO~L vEsCiti~nO~ fi- CL 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~ CL' CL (..L Cl._ PLATE APPENDIX B 1100 California Ave. Bakersfield, California 93304 805 / 322~250" 8001351>3515 FAX 805/322-4322 LABORATORY REPORT ATTEHTION: Mark Magargee SAMPLE ID: 06001 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesel PROJECT: ARCO So. "H" NTL LAB.#: 060890C-1 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soii METHOD: CaIif. D.O.H.S. Method 25' RESULTS: CONSTITUENT RESULTS MRL Total Petroleum Hydro- carbons as Diesel Hone Detected 10.00 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: California D.O.H.S. Cert. tt 225 100 Califomia Ave. Bakersfield, Califomb~ 93304 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06001 DATE SAMPLE RECEIVED: 06/08/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: BTX & E PROJECT: ARCO - So. "H" NTL LAB #: 060890C-1 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soii METHOD: Modified 8020 RESULTS: CONSTITUENT RESULTS Benzene None Detected Toiuene None Detected Xyienes None Detected ELhyl Benzene None Detected MRL = Minimum Reporting Level MRL 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm DATE REPORTED: 06/15/90 DATA RELEASE AUTHORIZED BY: ~ California D.O.H.S. CerC. # 225 1100 Califomia Ave. xl. colog , .... Laboratsr Bakersfield, California 93304 80513224250 350-3515 FAX 805'7 322:4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06002 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesel PRO3ECT: ARCO So. "H" NTL LAB .#: 060890C-2 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS MRL Total Petroleum Hydro- carbons as Diesel 29.2 ug/gm 10.00 ug/gm MRL = Minimum Reporting Level DATE REPORTED: DATA RELEASE AUTHORIZED BY: I California D.O.HiS. Cert. # 225 Laboratory Name: N.T~L. INC. Concentration: LOW Lab Sample ID: 060890C-2 ~ Sample Matrix: SOIL _ Client Sample ID: 6002 Percent Moisture: I~THOD 8240 CAS Ntunber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 u~iKa Acetone ......... 50.0 Acrolein ......... 50.0 Carbon Disulfide .... 5.00 1,1-Dichloroetheme .... 5. O0 Trans- 1,2-Dichl oroe thene 5. O0 Chloroform ........ 5.00 1,2-Dichloroethane . 5.00 2-Butanone (MEK) ..... 20.0 4-Methyl-2-Pent~mone (MIBK)iO.O 1,1,1-Tr ichloroetheme 5. O0 Carbon Tetrachloride 5.00 Bromodichlorometheme 5.00 1,2-Dichloroprop~me . 5.00 Trichloroethene ..... 5. O0 Dibromochloromethane . 5. O0 1,1,2-Trichloroethane 5.00 Benzene ....... . . . 2.00 10061-01-5 cis-l,3-Dichloropro~ene 5.00 < 10061-02-6 trans-l,3-Dichloropropene 5.00 < 75-25-2 Bromoform ........ 5.00 < 591-78-6 2-Hexanone ........ 5.00 < 127-18-4 Tetrachloroe~mne .... 5.00 < 79-34-5 1,1,2,2-Tetrachloroe~mne 5.00 < 108-88-3 Toluene ......... 2.17 108-90-7 £~lorobenzene ...... 5.00 < 100-41-4 Ethylbenzene ....... 2.00 < 100-42-5 Styrene ......... 5.00 < 1330-20-7 Xylene (total) ...... 2.00 < 74-97-5 Bromochloromethmm .... 5.00 < 74-87-3 ~floromethane ...... 5.00 < CAS Number 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 Date Ex%~aeted :.- Date Analyzed: Dilution Factor: ua/Ka 2,2-Dichloropropo~le . 5.00 1,1-Dichloropropene . 5.00 Bromomethane ....... 5.00 Dibromomethane ..... '. 5.00 1,3-Dichloropro~le 5.00 1,1,1,2-Tetrachloroethane 5.00 Chloroethane ....... 5.00 1,2-Dibromoeth~e .... 5.00 Methylene Chloride .. 5.00 cis-l.2-Dichloroethene . 5.00 1,2,3-Trichloropropane . 5.00 Isopropylbenzene ..... 5.00 1,1-Dichloroethene . 5.00 Bromobenzene ....... 5.00 2-Chlorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 4-Chlorotoluene ..... 5.00 1,3,5-Trimethylbenzene 2.00 tert-Butylbenzene . . 5.00 1,2,4-Trimethylbenzene 3.80 1,3-Dichlorobenzene . . . 5.00 sec-Butylenzene ..... 5.00 1,4-Dichlorobenzene . . 5.00 p-Isopropyltoluene . . 5.00 1,2-Dichlorobenzene . 5.00 n-Butylbenzene ...... 5.00 1,2-Dibromo-3-chloropropanelO.O Naphthalene ....... 26.1 1,2,3-Trichlorobenzene .~. 5.00 Hexachlorobutadiene . 5.00 The Lab ID for data on this page is RKIOX08C2. < - Compotmd not detected above ~e listed minimtun detection limit. Pa~e2 VOLATILE ORGANICS ANALYSIS DATA SHEET TENTATIVELY IDENTIFIED COMPOUNDS* NTL Sample ID: 060890C-2 Date Received: 06-08-90 Date Analyzed: 06-22-90 Time Analyzed: 18:12 Dil. Factor: 1 Date extracted: 06-22-90 Reporting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil Constituent None Found. CAS RLm Analysis Number Time Results * Up to ten of the largest non-target analytes were selected. Identification is based upon analyst interpretation of spectra and a computer search against our 70,000 compo~md NB Library database. Quantitation estimate is based upon an assumed one to one response with file closest non-contaminated internal standard. California DOHS Certification N~mber 225 Additional Comments: XlCO O, Laborator es ',,,c. 1100 California Ave. Bakersfield, California 93304 805/322-4250 "NareShiC:~ Jaln~,~Ph.D. Thoma. C. Snenlh, B.$. _ Chiel. ,T, oxicologisl 800 / 350-3515 FAX 805/322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06003 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesel PROJECT: ARCO So. "H" NTL LAB fi: 060890C-3 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method 'RESULTS: CONSTITUENT Total Petroleum Hydro- carbons as Diesel RESULTS MRL 67.4 ug/gm 10.00 ~g/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: California D.O.H.S. Cert. ~ 225 ~TILE ORGANICS ANALYSIS DATA Laboratory Name: N.T.L. INC. Concentration: Lab Sample ID: 060890C-3 Sample Matrix: SOIL Client Sample ID: 6003 Percent Moisttu~e: METHOD 8240 CAS Ntunber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 · 67-66-3 107-06-2 78-93-3 lO8-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 ~lg/Kg Acetone ......... 100 < Acrolein ......... 100 Carbon Disulfide ..... 10.0 1,1-Dichloroethane .... 10.0 < Trans-l,2-Dichloroethene 10.0 < C~loroform ........ 10.0 1,2-Dichloroethea~e .... 10.0 .'.: 2-Butanone (MEK) ..... 40.0 4-Methyl-2-Pentanone (MIBK)20.O 1,1,1-Trichloroethane 10.0 -::: Carbon Tetrachloride 10.0 < Bromodichloromethane . 10.0 1,2-Dichloropropa~e lO. 0 Trichloroethene ..... 10.0 .::: Dibromochloromethane 10.0 < 1,1,2-Trichloroethane 10.0 Benzene ......... 4. O0 10061-01-5 cis-1,3-Dichloropropene 10061-02-6 trea~s-l,3-Dichloropro~ene 75-25-2 591-78-6 127-18-4 79-34-5 108-88-3 108-90-7 100-41-4 100-42-5 1330-20-7 74-97-5 74-87-3 10.0 10.0 Bromoform ........ 10.0 2-Hexanone ........ 10.0 Tetrachloroetl~ene .... lO.() 1,1,2,2-Tetrachloroethane 10.0 Toluene ......... 236 6~lorobenzene ...... 10.0 Ethylbenzene ....... 122 Styrene ......... lO. 0 Xylene (total) ..... . 734 Bromochloromethane .... 10.0 Chloromethm~e ...... 10.0 CAS Number 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 .. 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 2,2-Dichloropropane . 10.0 1,1-Dichloropropene . 10.0 Bromomethmle ....... 10.0 Dibromomethane ...... 10.0 1,3-Dichloropropane . 10.0 1,1,1,2-Tetrachloroethane 10.0 Chloroethane ....... 10.0 1,2-Dibromoe thane .... 10.0 Methylene Chloride . . 10.0 cis-1,2-Dichloroethene . 10.0 1,2,3-Trichloropropane . . 10.0 I sopropylbenzene ..... 49.4 1,1-Dichloroethene . 10.0 Brcmobenzene ....... 10.0 2-Chlorotoluene ..... 10.0 n-Propylbenzene ..... 119 4-Chlorotoluene ..... 10.0 1,3,5-Trimethylbenzene . 176 tert-Butylbenzene . 10.0 1,2,4-Trimethylbenzene . 592 1,3-Dichlorobenzene lO. 0 sec-Butylenzene ..... 31.0 1,4-Dich lorobe~zene 10.0 p-Isopropyltoluene . . 24.2 1,2-Dichlorobenzene 10.0 n-Butylbenzene ...... 10.0 1,2-Dibromo-3-chloropropane20.0 Naphthalene ....... 2720 1,2,3-Trichlorobenzene . 10.0 Hexachlorobutadiene 10.0 u~/Ka < < < < < < < < < ~e Lab ID for data on this page is RK14X08C3. < - Compo~md not detected above the listed minimt~n detection limit. Data Release Authorizat ion: ~ (~t~_~) VOLATILE ORGANICS ANALYSIS DATA SHEET TENTATIVELY IDENTIFIED COMPOUNDS* NTL Sample ID: 060890C-3 Date Received: 06-08-90 Date Analyzed: 06-22-90 Time Analyzed: 20:48 Dil. Factor: 2 Date extracted: 06-'22-90 Reporting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil Constituent 1. Undecane 2. Aliphatic Hhdrocarbon 3. Alphatic Hydrocarbon 4. Decahydromethylnaphthalene Isomer 5. Decahydromethylna~thalene Isomer 6. Ali~atic Hydrocarbon 7. Aliphatic Hydrocarbon 8. Aliphatic Hydrocarbon 9. Aliphatic Hydrocarbon 10. Dodecane CAS Run Analysis Number Time Results 1120-21-4 19:10 92000. 19:].7 8900. 19:28 23000. 19:41 75000. 19:59 61000. 20:14 24000. 20:19 13000. 20:48 33000. 20:33 12000. 112-41)-3 21:08 52000. * Ug, to ten of the largest non-target analytes were selected. Identification is based upon analyst intert~etation of spectra and a com~ter search against our 70,000 comt~md NB Library database. 9uantitation estimate is based ,~n an ass~zmed one to one response with the closest non-contaminated internal standard. California DOHS Certification Number 225 Additional Comments: oat. ional LabSrato' i S 1100 California Ave. Bakersfield, California 93304 805 / 322-4250 8~ / 350-3515 FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE Id: 06004 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesel PROJECT: ARCO So. "H" NTL LAB #: 060890C-4 'DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Hethod RESULTS: CONSTITUENT RESULTS Total Petroleum Hydro- carbons as Diesel 22.4 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 MRL lO.O0 ug/gm DATA RELEASE AUTHORIZED BY: California D.O.H.S. Cert. ~ 225 Laboratory Name: N.T.L. INC. Lab Sample ID: 060890C-4 Client. Sample ID: 6004 CAS Nt~ber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 LE ORGANICS ANALYSIS DATA Concentration: LOW Sample Matrix: SOIL Percent Moisture: METHOD 8240 ua/Ka Acetone ......... 50.0 Acrolein ......... 50.0 Carbon Disulfide ..... 5.00 l, 1-Dichloroethane .... 5. O0 Trans-l,2-Dichloroethene . 5.00 Chloroform ........ 5.00 1,2-Dichloroethane .... 5.00 2-Butanone (MEK) ..... 20.0 4-Methyl-2-Pentemone (MIBK)IO.O l, 1,1-Trichloroetheme . 5.00 Carbon Tetrachloride 5. O0 Bromodichlorometheme 5.00 1,2-Dichloropropea]e 5. O0 Trichloroethene ..... 5. O0 Dibromochloromethane 5. O0 1,1,2-Trichloroetheme 5.00 Benzene ......... ~. 30 5.00 5.00 Bromoform ........ 5. O0 '-' ',' e ........ 5. O0 ,~-He..allon . Tetrachloroethene .... 5.00 1,1,2,2-Tetrachloroethane 5.00 Toluene o 00 Cq]lorobenzene ...... 5.00 Ethylbenzene ....... 2.00 Styrene ......... 5.00 Xylene (total) ...... 2.00 Bromochlorometh~e .... 5. O0 Chloromethm~e ...... 5. O0 10061-01-5 cis-1,3-Dichloropro~ene 10061-02-6 tre~s- 1,3-Dichloropropene 75-25-2 591-78-6 127-18-4 79-34-5 108-88-3 108-90-7 100-41-4 100-42-5 1330-20-7 74-97-5 74-87-3 GAS Ntnnber 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4' 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 t Date Analyzed:' ~' ~ Dilution Fa¢gor:.'.. 1.0 ua/Ka 2,2-Dichloropropane . 5.00 1,1-Di~loropropene . 5.00 Bromomethane ....... 5.00 Dibromomethane ...... 5.00 1,3-Dichloropropane . 5.00 1,1,1,2-Tetrachloroethane 5.00 O~loroeth~e ....... 5.00 1,2-Dibromoethm~e .... 5.00 Methylene O~loride . . . . 5.00 cis-l,2-Dichloroethene . . 5.00 1,2,3-Trichloropropane . . 5.00 Isopropylbenzene ..... 5.00 1,1-Dichloroethene .... 5,00 Bromobenzene ....... 5.00 2-Chlorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 4-~lorotoluene ..... 5.00 1,3,5-Trimethylbenzene . 2.00 tert-Butylbenzene . . 5.00 1,2,4-Trimethylbenzene . 2.00 1,3-Dichlorobenzene . . 5.00 sec-Butylenzene ..... 5.00 1,4-Did~lorobenzene . 5.00 ~Isopropyltoluene .... 5.00 1,2-Dichlorobenzene .. 5.00 n-Butylbenzene ...... 5.00 1,2-Dibromo-3-chloropropanelO.O Naphthalene ....... 5.00 1,2,3-Trichlorobenzene . 5.00 Hexachlorobutadiene . . 5.00 The Lab ID for data on this page is RK13X08C4. < - Compotmd not detected above the listed minimtun detection limit. VOLATILE ORGANICS ANALYSIS DATA SHEET TENTATIVELY IDENTIFIED COMI~OUNDS* NTL Sample ID: 060890C-4 Date Received: 06-08-90 Date Analyzed: 06-22-90 Time Analyzed: 20:19 Dil. Factor: I Date extracted: 06-22-90 Reporting Units: ug/Kg Test Method: EPA 8240 ~pe of sample: Soil Constituent None Found. CAS R~m Analysis Number Time Results * Up to ten of the largest non-target analytes were selected. Identification is based upon catalyst interpretation o£ spectra and a computer search against our 70,000 compound NB Library database. Ck~aa~titation estimate is based upon an ass~ued one to one response with the closest non-contaminated internal standard. California DOHS Certification N~m~ber 225 Additional Comments: ! 100 California Ave. Bakersfield, California 93304 805 / 322-4250 800 / 350-3515 FAX 8051322-4322 LABORATORY REPORT ATTENTION: Mark Maga~'gee SAMPLE ID: 06008 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesei PROJECT: ARCO So. "H" NTL LAB #: 060890C-8 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS Total Petroleum Hydro- carbons as Diesel 14.6 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA REt. EASE AUTHORIZED BY: ~¢.~ California D.O.H.S. Cert. ~ 225 MRL lO.O0 ug/gm oat.i°nal i XlrCOlOg~,. t ~* 'Lab oratories 11 O0 California .Ave. Bakersfield, California 93304 805 / 322-4250 800 / 360-3515 'FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06008 DATE SAMPLE RECEIVED: 06/08/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: BTX & E RESULTS: PROJECT: ARCO - So. "H" NTL LAB #: 060890C-8 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Modified 8020 CONSTITUENT Benzene Toluene Xylenes Ethyl Benzene RESULTS None Detected Hone Detected None Detected None Detected MRL O.OS ug/gm 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm MRL : Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: ~ California D.O.H.S. Cert. ~ 225 at. ional Xl~ology... : EabO rat O~ le~S''. i~cl ! 100 California Ave. Bakersfield, California 93304 805/322-4250 8001350-3515 FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Hark Magargee SAMPLE ID: 06009 DATE SAHPLE RECEIVED: 06/11/90 DATE COLLECTED: 06/08/90 TEST RE~UESTED: TPH as Diesel PROJECT: ~ 90416 ARCO So. "H" NTL LAB ~: 061190A-I DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soii METHOD: CaIif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS Total Petroleum Hydro- carbons as Diesel 2080 ug/gm MRL = Minimum Reporting Level MRL lO.O0 ug/gm DATE REPOR'rED: 06/15/90 / DATA RELEASE AUTHORIZED CaiJfornia D.O.H.S. Cert. ~ 225 Laboratory Name: N.T.L~ INC. Lab Sample ID: 061190A-1 Client Sample ID: /~009 CAS N~unber ORGANICS ANALYSIS Concentration: ~ ...-'. Date,~~~t::..." S~ple Matrix: ~ , Date ~~:~:~:'~ Percent Moistt~: ~ ..~:.:~tlution~Fa¢~.:'::-:': :,. :50 ug/K~ CAS Nvmber · ug/K~ 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 Acetone ......... 2500 Acrolein ......... 2500 Carbon Disulfide ..... 250 1,1-Dichloroe thane .... 250 Trans-1 ,'2-Dichloroethene 250 £,~loro form ........ 110 l, 2-Dichloroeth~u~e .... 25(I 2-Butanone (MEK) ..... 1000 4-Methyl-2-Pentanone (MIBK) 500 1,1,1-Trichloroethane . 250 Carbon Tetrachloride . 250 Bromodichloromethe~m . 250 1,2- Dich loropr opane 250 Trichloroethene .' .... 25(I Dibromochlorometh~u~e . 250 l, l, 2-Trichloroethm~e 250 Benzene ......... lO0 10061-01-5 cis-1,3-Dichloropropene 250 10061-02-6 trans-l,3-Dichloropropene 250 75-25-2 Bromoform ........ 250 591-78-6 2-Hex~one ........ 250 127-18-4 Tetrachloroethene .... 250 79-34-5 1,1,2,2-Tetrachloroetha~e 250 108-88-3 Toluene ......... 451 108-90-7 Chlorobenzene ...... 25(I 100-41-4 Ethylbenzene ....... 100 100-42-5 Styrene ......... 25(I 1330~20-7 Xylene (total) ...... 12000 74-97-5 Bromochlorometh~e .... 250 74-87-3 C~loromethane ...... 250 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 2,2-Dtchloropropane '. 250 1,1-Dtchloropropene 250 Bromomethane ....... 250 Dibromomethane ...... 250 1,3-Dichloropropane . 250 1,1,1,2-Tetrachloroethane 250 ~loroethane ....... 250 1,2-Dibromoethane . 250 Methylene C~lorlde . 2380 cis-l,2-Dichloroethene . . 108 1,2,3-Trichloroprop~e . . 250 Isopropylbenzene ..... 775 1,1-Dichloroethene .... 250 Bromobenzene ....... 250 2-Chlorotoluene ..... 250 n-Propylbenzene ..... 1580 4-Chlorotoluene ..... 160 1,3,5-Trimethylbenzene . . 3590 tert-Butylbenzene .... 250 1,2,4-Trimethylbenzene . . 16600 1,3-Dlchlorobenzene . . 250 sec-Butylenzene ..... 1800 1,4-Dichlorobenzene . 250 ~Isopropyltoluene .... 970 1,2-Dichlorobenzene . . 250 n-Butylbenzene ...... 1970 1,2-Dibromo-3-chloropropane500 Naphthalene ....... 250 1,2,3-Trichlorobenzene . 250 Hexachlorobutadiene 250 The I~b ID for data on this page is RL18XllA1. B - Compound was detected in QC blank. ' J - Compo~md present, but below ~L. < - Compound not detected above the listed minim~ detection limit. Data Release Authorization' ~i~-J j · ''VOLATILE 6RGANICS ANALYSIS DATA sHEET TENTATIVELY IDENTIFIED COMPOUNDS* page 2 NTL Sample ID: 061190A-1 Date Received: 06-11-90 Date Analyzed: 06-24-90- Time Analyzed: 16:44 Dil. Factor: 50 Date extracted: 06-24-90 Reporting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil Constituent 1. Octane 2. Ethylmethylbenzene Isomer 3. 1,2,3-Trimethylbenzene 4. Cll Branched Alkene 5. Decahydronaphthalene Isomer 6. Cll Branched Alkane 7. Decahydromethylnaphthalene Isomer 8. Decahydromethylnaphthalene Isomer 9. Ethyldimethylbenzene Isomer 10. Aliphatic Hydrocarbon CAS Number 111-65-9 526-73-8 Rrm Analysis Time Results 11:06 5900. 15:43 9700. 17:16 5200. 17:51 6000. 18:09 8600. 16:44 9300. 19:25 11000. 19:48 14000. 20:14 8600. 20:58 5600. '* Up to ten of the largest non-target analytes were selected. Identification is based ufmn analyst interpretation of spectra and a computer search against our 70,000 compound NB Library database. Cktantitation estimate is based uE~n an assumed one to one response with the closest non-contaminated internal standard. California [OHS ¢~rtification Number 225 Additional (~mments: . lat, ional: _ loxlcolog 'l?b°rat°ries i 100 California Ave. Bakersfield, Califomia 93304- 805/322-4250 8001350-3515 FAX 8051322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09010 DATE SAMPLE RECEIVED: 06/11/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: TPH as' Diesei PROgECT: fl 90416 ARCO So. "H*' NTL LAB #: 061190A-2 DATE ANALYZED: 06/I1/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS Totai Petroieum Hydro- carbons as Diesel MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 California D.O.H.S. Cert. # 225 17.8 ug/gm MRL 10.00 ug/gm Laboratory Name: N.T.L. INC. Lab Sample ID: 061190A-2 _.Client Sample ID: 9010 . CAS ~lt~ber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 lO8-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 fILE ORGANICS ANALYSIS DATA S~ Concentration: Sample Matrix: Percent Moisture: METHOD 8240 u~/K~ Acetone ......... 50.0 Acrolein ......... 50.0 Carbon Disulfide ..... 5.00 1,1-Dichloroethane .... 5.00 Trans-l,2-Dichloroethene 5.00 ~loroform ........ 5.00 1,2-Dichloroethane .... 5.00 2-Butanone (MEK) ..... 20.0 4-Me~yl-2-Pentanone fMIBK)IO.O l, l, 1-Trichloroethane 5. O0 Carbon Tetrachloride . 5.00 Bromodichloromethane . 5.00 1,2-Dichloroprop~e . 5.(10 Trichloroethene ..... 5. O0 Dibromochloromethane 5.00 1,1,2-Trichloroeth~e 5.00 Benzene ......... 2. O0 Bromoform ........ 5. O0 2-Hexanone ........ 5.00 Tetrachloroethene .... 5.00 1,1,2,2-Tetrachloroethane 5.00 Toluene ......... ,~. O0 C~tlorobenzene ...... 5. O0 Ethylbenzene ....... 2.00 Styrene ......... 5.00 Xylene (total) ...... 2.00 Bromochloromet, heme .... 5.00 Ol~lorometheme ...... 5.00 10061-01-5 cis-l,3-Dichloroprol-~.ne . 5.00 10061-(12-6 trs~s-l,3-Dichlorol:,ro~ene 5.00 75-25-2 591-78-6 127-18-4 79- 34- 5 108-88-3 108-90-7 100-41-4 100-42-5 1330-20-7 74-97-5 74-87-3 CAS Nt~ber 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 Date Analyzed:' Dilution Factor: · 1.0 u~/K~ 2,2-Dichloropropane . 5.00 1,1-Dichloropropene . . 5.00 Bromomethane ....... 5.00 Dibromomethane ...... 5.00 1,3-Dichloropropane . 5.00 1,1,1,2-Tetrachloroethane 5.00 ~loroethane ....... 5.(10 1,2-Dibromoethm~e . . 5.00 Methylene 6~loride .... 15.2 cis-l,2-Dichloroethene . . 5.00 1,2,3-Trichloropropane . . 5.00 Isopropylbenzene ..... 5.00 1,1-Di~loroe~ene . . . 5.00 Bromobenzene ....... 5.00 2-~lorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 4-~lorotoluene ..... 5.00 1,3,5-Trimethylbenzene . 2.00 tert-Butylbenzene .... 5.00 1,2,4-TrimeM~ylbenzene 2.00 1,3-Dlchlorobenzene . . 5.00 sec-Butylenzene ..... 5.0(I 1,4-Dichlorobenzene 5.00 p-Isopropyltoluene .... 5.00 1,2-Dichlorobenzene . . 5.00 n-Butylbenzene ...... 5.00 1,2-Dibromo-3-chloropropanelO.O NaPhthalene ....... 12.3 1,2,3-Trichlorobemzene 5.00 Hexachlorobutadiene . 5.00 The Lab ID for data on this page is RL14XllA2. B - Compound was detected in QC blank. < - Compound not detected above the listed minimtun detection limit. Data Release Authorization: ~{~ ~i~~ -.. VOLATILE ORGANICS ANALYSIS DATA SHEET TENTATIVELY IDENTIFIED COMPOUNDS* NTL Sample ID: 061190A-2 Date Received: 06-11-90 Date Analyzed: 06-24-90 Time Analyzed: 14:04 Dil. Factor: 1 Date extracted: 06-24-90 Rel~rting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil Constituent 1. C13 Branched Alkane °~. C13 Branched Alkane 3. Cll Branched Alkane 4. Cll Branched Alkane 5. C13 Brenched Alkane 6. C13 Branched Alk~me 7. C14 Branched Alkane CAS Run Analysis Number Time Results 18':50 8.4 16:56 9.1 20:00 9.2 12:12 6.0 20:56 25. 21:13 13. 22:14 22. * Up to ten of the largest non-target analytes were selected. I'dentification is based u~n analyst interpretation of spectra and a computer search against our 70,000 compound NB Library database. Quantitation estimate is based ul~n an assumed one to one response with the closest non-contaminated internal standard. California DOHS Certification Number 225 Additional C~mments: oa t. ion'al xlColog LabOratorie ! 100 California Ave. Bakersfield, California 93304 805 / 322-4250 8001350-3515 FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 0901i DATE SAMPLE RECEIVED: 06/11/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: TPH as Diesel PROJECT: ~ 90416 ARCO So. "H" NTL LAB #: 06II90A-$ DATE ANALYZED: 06/II/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS Total Petroleum Hydro- carbons as Diesel 11.6 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: /~"~1 California D.O.H.S. Cert. ~ 225 MRL 10.00 ug/gm ? LAboratory Name: N.T.L. INC. Lab Sample ID: 061190A-3 Client Sample ID: 9011 CAS N~ber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 ~.~TILE ORGANICS ANALYSIS DATA. C~ncentration: Sample Matrix: Percent Moisture: METHOD 8240 10061-01-5 c is- 1,3-Dichloroprol:~.ne 5.00 10061-02-6 trans-l,3-Dichloropro~.ne 5.00 75-25-2 Bromo£orm ........ 5.00 u~/Ka Acetone ......... 112 Acrolein ......... 50.0 Carbon Disulfide ..... 5.00 1,1-Dichloroethane .... 5. O0 Trans-l,2-Dichloroethene . 5.00 Chloroform ........ 5. O0 1,2-Dichloroethane .... 5.00 2-Butanone (MEK) ..... 20.0 4-Meth¥1-2-Pentanone (MIBK) 10.0 1,1,1-Trichloroethane 5. O0 Carbon Tetrachloride 5.00 Bromodichlorometheme 5. O0 1,2-Dichloropropane 5. O0 Trichloroethene ..... 5. O0 Dibromochloromethane 5.00 1, l, 2-Trichloroethane . 5.00 Benzene ......... 2. O0 2-Hexanone ........ 5. O0 <: Tetrachtoroethene .... 5. O0 1,1,2,2-Tetrachloroethane 5.00 Toluene ......... 2.00 (,]~lorobenzene ...... 5. O0 Ethylbenzene ....... 2. O0 Styrene ......... 5. O0 591-78-6 127-18-4 79-34-5 105-88-3 108-90-7 100-41-4 100-42-5 1330-20-7 Xylene (total) - ..... 2.00 74-97-5 Bromochlorometheme .... 5. O0 74-87-3 Chloromethane ...... 5.00 CAS Nmnber 590-20-7 563-58-6 75-25-2 74-95-3 14.,.-~8-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 .. 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 ug/K~ 2,2-Dichloropropane . 5.00 1,1-Dichloropropene . 5.00 Bromomethane ....... 5.00 Dibromomethane ...... 5.00 1,3-Dichloropropane 5.00 1,1,1,2-Tetra~loroethane- 5.00 Chloroethane ....... 5.00 1,2-Dibromoethane . 5.00 Methylene Chloride . 19.6 cis-l,2-Dichloroethene . 5.00 1,2,3-Trichloropropane 5.00 Isopropylbenzene ..... 5.00 1,1-Dichloroethene .... 5.00 Bromobenzene ~ ...... 5.00 2-Chlorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 < 4-Chlorotoluene ..... 5.00 < 1,3,5-Trime~ylbenzene 2.00 < tert-Butylbenzene .... 5.00 < 1,2,4-Trimethylbenzene . 2.00 < 1,3-Dichlorobenzene 5.00 < sec-Butylenzene ..... 5.00 < 1,4-Di~lorobenzene . 5.00 < p-Isopro~ltoluene .... 5.00 < 1,2-Di~lorobe~mene .... 5.00 < n-Butylbenzene ...... 5.00 < 1,2-Dibromo-3-chloropropanelO.O < Naphthalene ....... 5.00 < 1,2,3-Trichlorobenzene 5.00 < Hexachlorobutadiene 5.00 < ~e Lab ID for data on this page is RL16XllA3. B - Compmmd was detected in QC bl~k. < - Compotmd not detected above the listed minimt~ detection limit. Data Release Authorization: 1100 California Ave. IOXlC,O Og¥ 'Lab'O ratbries Bakersfield, California 93304 805/322-4250 Nareslt~C. Jaln;, Ph.D. Thoma C. Snealh, B.S. .. ,- , ~" , Chief. Toxicologisl 8001350-3515 FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09012 DATE SAMPLE RECEIVED: 06/11/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: TPH as Diesel RESULTS: PROJECT: ff 90416 ARCO So. "H" NTL LAB #: 061i90A-4 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method CONSTITUENT Total Petroleum.Hydro- carbons as Diesel RESULTS None Detected MRL iO.O0 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/15/90 California D.O.H.S. Cert. ~ 225 qoat. ional xlCO!OgY , Lab*sratorie's 1100 California Ave. Bakersfield, California 93304 805/322-4250 8001350-3515 FAX8051322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09012 DATE SAMPLE RECEIVED: 06/08/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: BTX & E RESULTS: PROJECT: ~ 90416 ARCO - SO. "H" NTL LAB #: 061190A-4 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Modified 8020 CONSTITUENT RESULTS ......................................... Toluene Xylenes Ethyl Benzene None Detected None Detected None Detected None Detected MRL = Minimum Reporting Level MRL 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm DATE REPORTED: 06/15/90 DATA RELEASE AUTHORIZED California D.O.H.S. Cert. ~ 225 1100 California Ave. Bakersfield, California 93304 805/322-4250 800/350-3515 FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09015 DATE SAMPLE RECEIVED: 06/11/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: TPH as Diesel PROJECT: ff 90416 ARCO So. "H" NTL LAB #: 061190A-5 DATE ANALYZED: 06/l!/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT Total Petroleum Hydro- carbons as Diesel RESULTS MRL None Detected 10.00 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/15/90 DATA RELEASE AUTHORIZED BY://~F~ / California D.O.H.S. Cert. ~ 225 oat. ional xlcology Laboralor es 1100 California Ave. Bakersfield, California 93304 805~322-4250 8001350-3515 Naresh C. Jain, Ph.D. Laboratory. Director Thomas C. Sheath, B.$. Chief Toxicologisl FAX 8051322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09013 DATE SAMPLE RECEIVED: 06/08/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: BTX & E PROJECT: ~ 90416 ARCO - So. "H" NTL LAB ~: 06iI90A-5 DATE ANALYZED: 06/II/90' SAMPLE TYPE: Soil METHOD: Modified 8020 RESULTS: CONSTITUENT RESULTS MRL Benzene Toiuene Xyienes Ethyi Benzene None Detected None Detected None Detected None Detected 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/15/90 DATA RELEASE AUTHORIZED California D.O.H.S. Cert. ~ 225 oat.i°nal Xlcology Laboratories 1100 California Ave. Bakersfield, California 93304 805 / 322-4250 8001350-3515 Naresh C. Jain, Ph.D. Laboratory Director Thomas C. Sneath, B.S. Chief Toxicologisl FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09014 DATE SAMPLE RECEIVED: 06/11/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: TPH as Diesel PROJECT: ~ 90416 ARCO So. "H" NTL LAB #: 061190A-6 DATE ANALYZED: 06/11/90 SAMPLE TYPE: soil. METHOD: Calif. D.O.H.S. Method RESULTS: RESULTS MRL CONSTITUENT Total Petroleum Hydro- carbons as Diesel 16.4 ug/gm * 10.00 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/15/90 DATA RELEASE AUTHORIZED 8Y:/~.~i * COMMENT: Chromatogram does not match diesel tph. California D.O.H.S. Cert. ~ 225 ~ILE ORC~ICS ANALYSIS DATA Laboratory Name: N,T.L. INC, Lab Sample ID: 061190A-6 Client,Sample ID: 9014 (bncentration: Sample Matrix: Percent MoistL~e: Date Extracted: Date Analyzed.: .Dilution Factor: 500 METHOD 8240 CAS N~nber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56r23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 u~/K~ Acetone ......... 25000 Acrolein ......... 2500(I Carbon Disulfide ..... 2500 1,1-Dichloroethea~e .... 2500 Trans-l,2-Dichloroethene - 2500 f~loroform ........ 2500 l, 2-Dichloroethane .... 2500 2-Butea~one (MEK) ..... 10000 4-Methyl-2-Pentanone (MIBK)5000 1,1,1-Trichloroethane 2500 Carbon Tetrachloride 2500 Bromodichloromethane - 2500 1,2-Dichloropropane 25(;0 Trichloroethene ..... 2500 Dibromochloromethea~e . . 2500 1,1,2-Trichloroethea~e 2500 Benzene ......... 1000 10061-01-5 cis-l,3-Dichloropro~ne 2500 10061-02-6 trans-l,3-DichloroproL~ne 2500 75-25-2 Bromoform ........ 2500 591-78-6 2-Hex~one ........ 2500 < 127-18-4 Tetrad]loroefl~ene .... 2500 79-34-5 1,1,2,2-Tetrachloroeth~e 2500 108-88-3 Toluene ......... 10600 108-90-7 ~]lorobenzene ...... 2500 100-41-4 Ethylbenzene ....... 18500 100-42-5 Styrene : ........ 2500 1330-20-7 Xylene (total) ...... 171000 74-97-5 Bromochloromethane .... 250(; 74-87-3 ~loromethane ...... 2500 CAS NLmber 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 . 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 u~/K~ 2,2-Dichloropropane 2500 1,1-Dichloropropene 2500 Bromomethm~e ...... 2500 Dibromomethane ...... 2500 1,3-Dichloroprop~e . 2500 1,1,1,2-Tetrachloroethane 2500 ~loroethane ....... 2500 1,2-Dtbromoethane . . 2500 Methylene ~loride . 14600 cis-l,2-Dichloroethene . . 2500 1,2,3-Trichloropropane . . 2500 Isopropylbenzene ..... 2500 1,1-Dichloroethene .... 2500 Bromobenzene ....... 2500 2-Chlorotoluene . . . '.. 2500 n-Propylbenzene ..... 2500 4-Chlorotoluene ..... 2500 1,3,5-Trimethylbenzene . . 1000 tert-Butylbenzene . . 2500 i,2,4-Trimethylbenzene . . 1000 1,3-Dichlorobenzene . 2500 sec-Butylenzene ..... 2500 1,4-Dichlorobenzene . 2500 p-Isopropyltoluene .... 2500 1,2-Dichlorobenzene ~ 2500 n-Butylbenzene ...... 2500 1,2-Dibromo-3-chloropropane5000 Naphthalene ....... 2500 87-61-61 ' 1,2,3-Trichlorobenzene 2500 87-68-3 Hexachlorobutadiene . 2500 ~e Lab ID for data on this page is RL17XllA6. B - Compotmd was detected in QC bl~k. < - Compound not detected above the listed minimum detection limit. Data Release Authorization: page 2 VOLATILE ORC~uNICS ANALYSIS DATA SHEET TENTATIVELY IDENTIFIED COMPOUNDS* NTL Sample ID: 061190A-6 Date Received: 06-11-90 Date Analyzed: 06-24-90 Time Analyzed: 15:50 Dil. Factor: 500 Date extracted: 06-24-90 Reporting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil Constituent 1. C~8 Branched Alkane 2. Octene 3. C9 Branched Alkane 4. Ethylmethylcyclopentane Isomer 5. Trimethylcyclohexane Isomer 6. C9 Branched Alkane 7. Ethylmethylbenzene Isomer 8. Ethylmethyl?~nzene Isomer 9. Methylpro~lbenzene Isomer lO. Ethyldimethylbenzene Isomer CAS R~m Analysis Number Time Results 111-65-9 10:07 40000. 11:07 110000. 12:00 33000. 12:12 48000. 12:18 57000. 14:01 90000. 15:42 180000. 16:11 33000. 17:53 62000. 18:41 36000. * Up to ten of the largest non-target analytes were selected. Identification is based upon enalyst interpretation of spectra and a computer search ~gainst our 70.000 compound NB Library database. Quantitation estimate is based u~n an assumed one to one response with the closest non-contaminated internal standard. California DOHS Certification Number 225 Additional Comments: loxlcolog¥ Laboratories 1100 California Ave. Bakersfield, California 93304 805/322-4250 8001350-3515 Nareah,C. Jain~ Ph.D. Lalx~alo~f Direclor Thomaa C. Sheath, B.S. Chiel Toxicologisl FAX 8051 322-4322 LABORATORY REPORT ATTENTIOH: Mark Magargee SAMPLE ID: 09015 DATE SAMPLE RECEIVED: 06/li/9o DATE COLLECTED: 06/08/90 TEST REQUESTED: TPH as Diesel PROJECT: # 90416 ARCO So. "H" NTL LAB ~: 061190A-7 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. MethOd RESULTS: CONSTITUENT RESULTS Total Petroleum Hydro- carbons as Diesel None Detected MRL = Minimum Reporting Level 10.00 ug/gm DATE REPORTED: 06/13/90 ./, DATA RELEASE AUTHORIZED BY:/~.~Z~ California D.O.H.S. Cert. # 225 Laboratory Name: N.T.L. INC. Lab Sample ID: 061190A-7 Client Sample ID: 90~5 CAS N~m~ber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56-23-5 75-27-4 78--87-5 79-01-6 124-48-1 79-00-5 71-43-2 ORGANICS ANALYSIS 'DATA Concentration: SamPle Matrix: Percent Moisture: Acetone ......... 50.0 Acrolein ......... 50.0 Carbon Disulfide ..... 5.00 1,1-Di~loroethane . . 5.00 Trans-l,2-Dichloroe~lene 5.00 ~loroform ........ 5.00 1,2-Dichloroefl~ane .... 5.00 2-Butanone (MEK) ..... 20.0 4-Methyl-2-Pentm~one (MIBK)IO.O 1,1,1-Trichloroethane 5.00 Carbon Tetrachloride 5.00 Bromodichloromethane 5.00 1,2-Di~loropropane 5.00 Trichloroefl]ene ..... 5.00 Dibromochlorometh~e 5.00 1,1,2-Trichloroethane 5.00 Benzene ......... 2.(10 5. O0 5.00 Bromoform ........ 5. O0 2-Hexanone ........ 5. O0 Tetrachloroethene .... 5.00 1,1,2,2-Tetrachloroetheme 5.00 Toluene ......... 2.00 £,~lorobenzene ...... 5.00 Ethylbenzene ....... 2.00 Styrene ......... 5. O0 Xylene (total) ...... 2. O0 Bromochloromethane .... 5. O0 Chloromethane ...... 5. O0 10061-01-5 cis-1,3-Dichloroprol~ne 10061-02-6 trans-1,3-Dichloroprope, ne 75-25-2 591-78-6 127-18-4 79-34-5 108-88-3 108-90-7 100-41-4 100-42-5 1330-20-7 74-97-5 74-87-3 METHOD 8240 %%~/Kg < < < < < < < <- < < < < < < < CAS N~ber 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103- 65-1 106-43-4 108-67-8 98-.06-6 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 Date EXtracted: Date Analyzed: DilutionFactor: ug/K~ 2,2-Dichloropropane . . 5.00 1,1-Dichloropropene . . 5.00 Bromometh~e ....... 5.00 Dibromome~ane ...... 5.00 1,3-Dichloroprop~e . . 5.00 1,1,1,2-Tetrachloroethm~e 5.00 £~]loroeth~e ....... 5.00 1,2-Dibromoethane .... 5.00 Methylene ~]loride .... 17.9 cis-l,2-Dichloroethene . 5.00 1,2,3-Trichloropropane . 5.00 Isopropylbenzene ..... 5.00 1,1-Dichloroe~ene .... 5.00 Bromobenzene ....... 5.00 2-Chlorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 4-~lorotoluene ..... 5.00 1,3,5-Trime~]ylbenzene 2.00 tert-Butylbenzene . 5.00 1,2,4-Trimethylbenzene 2.00 1,3-Did~lorobenzene 5.00 sec-Butylenzene ..... 5.00 1,4-Dichlorobenzene 5.00 ~Isopropyltoluene . 5.00 1,2-Did~lorobenzene 5.00 n-Butylbenzene ...... 5.00 1,2-Dibromo-3-chloropropanelO.O Naphthalene ....... 5.00 1,2,3-Trichlorobenzene . . 5.00 Hexachlorobutadiene . 5.00 The Lab ID for data on this page is RL15XllA7. B - Compo~md was detected in QC bla~. < - Compound not detected above the listed minim~ detection limit. Data Release Authorization: ft)~~I~ %~ ~) page 2 VOLATILE ORGANICS ANALYSIS DATA SHEET TENTATIVELY IDENTIFIED COMPOUNDS, NTL Sample ID: 061190A-7 Date Received: 06-11-90 Date Analyzed: 06-24-90 Time Analyzed: 14:29 Dil. Factor: 1 Date extracted: 06-24-90 Reporting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil CAS R~u~ Analysis Constituent Number Time Results i. C12 Branched Alkane 18:15 22. ~.° C12 Branched Alkane 19:39 18. 3. C13 Branched Alkane 22:09 18. * Up to ten of the largest non-target analytes were selected. Identification is based ut~n analyst interpretation of spectra and a computer search against our 70,000 comf~und NB Library database. Quantitation estimate is based u~n an assumed one to one response with the closest non-contaminated internal standard. California DOHS C~rtification Number 225 Additional Comments: oat.i°nal xacolojg Laboratorms 1100 California Ave. Bakersfield, California 93304 805 / 322-4250 8001350-3515 NareahC. Jain, Ph.D. Laboralor~ Director Thomas C. Sneath, B.S. Chief Toxicologisl FAX 8051322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09016 DATE SAMPLE RECEIVED: 06/I1/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: TPH as Diesel PROJECT: ~ 90416 ARCO So. "H" NTL LAB #: 061190A-B DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS Total Petroleum-Hydro- carbc, n~ as Diesel None Detected MRL = Minimum Reporting Level MRL 10.00 ug/gm DATE REPOR'rED: 06/13/90 DATA RELEASE AUTHORIZED California D.O.H.S. Cert. ~ 225 oat.i°nal xlcolog¥ Laboratories 1100 California Ave. Bakersfield, California 93304 805/322-4250 8001350-3515 Naresh'C~ Jain, Ph.D. LabOmm¥ Direclor Thomas C. Snealh, B.S. Chief.Toxicologisl FAX 8051322-4322 LABORATORY REPORT ATTENTION: Mark Magargee PROJECT: ~J- 90416 ARCO - So. "H" SAMPLE ID: 09016 NTL LAB #: 06IigOA-B DATE SAMPLE RECEIVED: 06/08/90 ~)DATE ANALYZED: 06/Ii/'90 DATE COLLECTED: 06/08/90 SAMPLE TYPE: Soil TEST REQUESTED: BTX & E METHOD: Modified 8020 RESULTS: CONSI'~TUENT RESULTS Benzene None Detected Toluene None Detected Xylenes None Detected Ethyl Benzene None Detected MRL O. 05 ug/gm 0.05 ug/gm O. 05 ug/gm O. 05 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: _~~ California D.O.H.S. Cert. fl 225 oat.i°nal xlcolog¥ Laboratories 1100 California Ave. Bakersfield, California 93304 805/322-4250. 800/350-3515 Nareah C. Jain, Ph.D.- Laboralory Director Thoma9 C. Sneath, B.S. Chief Toxicologist FAX 805/322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 090i7 DATE SAMPLE RECEIVED: DATE COLLECTED: 06'/08/90 TEST REQUESTED: TPH as Diesel PROJECT: # 90416 ARCO So. "H" NTL LAB #: 06IIaOA-9 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS Total Petroleum Hydro- carbons &s Diesel None Detected MRL = Minimum Reporting Level MRL 10.00 ug/gm DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: ~ Califocnia D.O.H.S. Cert. N 225 loxlcolog¥ Laboratorses 1100 California Ave. Bakersfield, California 93304 805/322-4250 800 / 350-3515 Nare~h C; Jain, Ph.D. · Laborer, S/Director Thomas. C. Sneeth, B.S. · Chief Toxicologisl FAX 805~322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 09017 DATE SAMPLE RECEIVED: 06/08/90 DATE COLLECTED: 06/08/90 TEST REQUESTED: BTX & E RESULTS: PROJECT: ff 90416 ARCO - So. "H" NTL LAB #: 061190A-9 DATE ANALYZED: o6/li/9o SAMPLE TYPE: Soil METHOD: Modified 8020 CONSTITUENT Benzer~8 Toluene Xylenes Ethyl Benzene RESULTS MRL None Detected None Detected None Detected None Detected 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED California D.O.H.S. Cert. ~ 225 Laboratory Nem~e: N.T.L. INC. C~ncentration: LOW Lab Sample ID: Semlple Matrix: SOIL Client Sample ID: BLANK Percent Moisture: Date Extracted: Date Analyzed: Dilution Factor: METHOD 8240 CAS Ntaber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6. 124-48-1 79-00-5 71-43-2 ua/Ka Acetone ......... 50.0 Acrolein ......... 50.0 Carbon Disulfide ..... 5.00 1,1-Dichloroethane .... 5.00 Trans-l,2-Dichloroethene 5.00 ~loroform ........ 5.00 1,2-Dichloroethane .... 5.00 2-Butanone'(MEK) ..... 20.0 4-Methyl-2-Pentanone (MIBK)IO.0 1,1,1-Trichloroethane 5.00 Carbon Tetrachloride 5.00 Bromodichlorome~ane . 5.00 1,2- Di~loropropane 5. (1(I Trichloroethene ..... 5. O0 Dtbromochlorome~ane . 5.00 1,1,2-Trichloroeth~e 5.(10 Benzene ......... 2.00 10061-01-5 cis-l,3-Dichloroprope, ne 5.00 10061-02-6 trans-l,3-Dichloropropene 5.00 75-25-2 Bromoform ........ 5.0(I 591-78-6 2-Hex~one '. ....... 5.(10 127-18-4 Tetrachloroethene .... 5.00 79-34-5 1,1,2,2-Tetrachloroethane 5.(10 108-88-3 Toluene ......... 2.00 108-90-7 ~lorobenzene ...... 5.00 100-41-4 Ethylbenzene ....... 2.00 100-42-5 Styrene ......... 5.(10 1330-20-7 Xylene (total) ...... 2.00 .74-97-5 Bromochloromethane .... 5.00 74-87-3 ~tlorome~ane ...... 5.00 CAS Nt~ber < 590-20-7 < 563-58-6 < 75-25-2 · ~.:74-95-3 < 142-28-9 < 630-20-6 < 75-00-3 <: 106-93-4 < 75-09-2 <: 156-59-4 < 96-18-4 <: 98-82-8 < 75-35-4 < 108-86-1 < 95-49-8 <: 103-65-1 <: 106-43-4 < 108-67-8 <: 98-06-6 < 95-63-6 <: 541-73-1 <: 135-98-8 <: 106-46-7 <: 99-87-6 < 95-50-1 < 104-51-8 < 96-12-8 · < 91-20-3 < 87-61-61 < 87-68-3 ~.~a/Ka 2,2-Dichloropropane . 5.00 1,1-Dichloropropene. . 5.00 Bromomethane ....... 5.00 Dibromomethane ...... 5.00 1,3-Dichloropropane . 5.00 1,1,1,2-Tetrachloroethmue 5.00 ~loroethm~e ....... 5.00 1,2-Dtbromoethm~e .... 5.00 Methylene ~aloride .... 5.00 cis-l,2-Dichloroethene . . 5.00 1,2,3-Trichloroprop~e . . 5.00 Isopropylbe. nzene ..... 5.00 1,1-Dichloroethene .... 5.00 Bromobenzene ....... 5.00 2-Chlorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 4-Chlorotoluene ..... 5.00 1,3,5-Trimethylbenzene . . 2.00 tert-Butylbenzene .... 5.00 1,2,4-Trimethylbenzene . . 2.00 1,3-Dichlorobe~zzene . 5.00 sec-Butylenzene ..... 5.00 1,4-Dichlorobenzene . 5.00 ~Isopropyltoluene .... 5.00 1,2-Dichlorobenzene .. 5.00 n-Butylbenzene ...... 5.00 1,2-Dibromo-3-chloropropanel0.0 Naphthalene ....... 5.00 1,2,3-Trichlorobenzene 5.00 Hexachlorobutadiene . 5.00 The Lab ID for data on this page is RK8MBLK. < - Compotmd not detected above the listed minim~ detection limit. Data Release Authorization: ~C-~t<~'.~ ~IATILE ORGANICS ANALYSIS DATA Laboratory Name: N.T.L. INC. Concentration: ' LOW Lab Sample ID: Sample Matrix: SOIL Client Sample ID: BLANK Percent Moisture: METHOD 8240 Date ExtraCted: Date Analyzed: Dilution Factor: 1.0 QAS N~ber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 lO8-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 u~/K~ Acetone ......... 50.0 < Acrolein ......... 50.0 < Carbon Disulfide ..... 5.00 < 1,1-Dichloroethane .... 5.00 < Trans-l,2-Dichloroethene 5.00 < ~loroform ........ 5.00 .< 1,2-Dichloroethane . 5.00 2-Butanone (MEK) ..... 20.0 4-Methyl-2-Pent~one (MIBK)IO.0 1,1,1-Trichloroe~ane . 5.00 Carbon Tetrachloride 5.00 Bromodichloromethane 5.00 1,2-Dichloroprop~e 5.00 Trichloroethene ..... 5.00 Dibromo~lorome~m~e . 5.00 1,1,2-Trichloroeth~e 5.00 Benzene ~.° O0 10061-01-5 cis-l,3-DichloroproL~ne 5.00 10061-02-6 tr~s-l,3-Dichloropropene 5.00 75-25-2 Bromoform ........ 5.00 591-78-6 2-Hexanone ........ 5.0(I 127-18-4 Tetrachloroethene .... 5.00 79-34-5 1,1,2,2-Tetrachloroe~t~e 5.00 108-88-3 Toluene ......... 2.00 108-90-7 ~lorobenzene ...... 5.00 100-41-4 Ethylbenzene ....... 2.00 100-42-5 Styrene ......... 5.00 1330-20-7 Xylene (total) ...... 2.00 74-97-5 Bromochloromethm~e .... 5.00 74-87-3 Q~loromethane ...... 5.00 CAS N¢~ber 590-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 uR/Kg 2,2-Dichloropropane . . 5.00 1,1-Dichloropropene . 5.00 Bromomethane ....... 5.00 Dibromomethane ...... 5.00 1,3-Dichloropropane . 5.00 1,1,1,2-Tetrachloroethane 5.00 ~loroethane ....... 5.00 1,2-Dibromoe~mne .... 5.00 Methylene ~loride .... 5.05 cis-l,2-Dichloroe~hene . . 5.00 1,2,3-Trichloropropane . . 5.00 Isopropylbenzene ..... 5.00 1,1-Dlchloroethene .... 5.00 Bromobenzene ....... 5.00 2-~lorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 4-Chlorotoluene ..... 5.00 1,3,5-Trimefl~ylbenzene . . 2.00 tert-Butylbenzene .... 5.00 1,2,4-Trimethylbenzene . . 2.00 1,3-Dichlorobenzene . 5.00 sec-Butylenzene ..... 5.00 1,4-Dichlorobenzene . 5.00 p-Isopropyltoluene .... 5.00 1,2-Dichlorobenzene . . . 5.00 n-Butylbenzene ...... 5.00 1,2-Dibromo-3-chloropropanelO.O Naphthalene ....... 5.00 1,2,3-Trichlorobenzene . . 5.00 Hexachlorobutadlene . 5.00 The Lab ID for data on ~is page is RL12MBLK. < - Compotmd not detected above the listed minim~ detection limit. Data Release Aufl~orization: PRO& NO. PROJECT NAME -~, ' / / / L.P. NO. SAMPLERS: (S~gnalure/Num~er) OF Type (P.O NO.) so" DATE SAMPLE ID. SAMPLE ID. E~S (W) REMARKS MM/~/YY HH:MM:SS Relinquished by: (Signllure) Date/Time Received by: (S~nalure} Remarks Send Results To~ ~ ~ I .... Attention of Relinqutsh~ b~ (sigflllu~ ~ ¢ "Oate~ime Recoived by: (S~nature) 1701 Westwm~ Or** Susie 101 Bakershel~. Calitorma 93301 Relinquishe~ b~ (Signmture) Oate~ime Received ~La~oratory by: PROJ. NO. PROJECT NAME ~.'~ ,~/ L.~. NO. SAMPLERS: (S,gnature/NumOerl OF Type (P.O. NO.) ~ s°" CON- (Si TAIN- Water DATE SAMPLE I.D. ERS <W) REMARKS TIME S~uOge M/DD/YY HH:MM:SS (sa) ieli~uishe~ bF lSig.am~*) Date~ime Received by: ~S~.am~el Remarks Send Results To ~_ _~ ~ AQUAGEOSCIENCES ~eli~oiSb~ b~ (~ur~ ' ~ate~ime Re~ived by: (Sig,tature) 1701 WeslwinO Dr.. Su,le 101 Bakersfield. Cal~torma 93~1 Reli~ulshed b~ (Si~nalure) / D~le~ime R~ceived for L~ratory b~ 1 1 CHAIN OF CUSTODY i°nal xlcolog¥ Laboratories 1100 California Ave. Bakersfield, California 93304 805 / 322-4250 8001350-3515 Nareeh C. Jain, Ph.D. Laboralo~/Director Thomas C. Sneath, B.S. Chief Toxicologisl FAX 805/322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06005 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesel PROJECT: ARCO So. "H" NTL LAB #: 060890C-5 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS Total Petroleum Hydro- carbons as Diesel 21.3 ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: ~~ / California D.O.H.S. Cert. ~ 225 MRL 10.OO ug/gm Laboratory Name: N.T.L. INC. [mb Sample ID: 060890C-5 Client Sample ID: 6005 CAS N~nber 67-64-1 107-02-8 75-15-0 75-34-3 156-60-5 67-66-3 107-06-2 78-93-3 108-10-1 71-55-6 56-23-5 75-27-4 78-87-5 79-01-6 124-48-1 79-00-5 71-43-2 [LE ORGANICS ANALYSIS DATA Concentration: Sample Matrix: Percent Moisture: METHOD 8240 u~/K~ Acetone ......... 50.0 Acrolein ......... 50.0 Carbon Disulfide ..... 5.00 1,1-Dichloroethane .... 5. O0 Trans- 1,2-Dichloroethene 5. O0 Chloroform ........ 5. O0 1,2-Dichloroethane .... 5.00 2-Butanone (MEK) ..... 20.0 4-Methyl-2-Pentanone (MI BK) 10.0 1,1,1-Tr ichloroethea]e 5. O0 Carbon Tetrachloride 5. O0 Bromodichloromethane . 5. O0 1,2-Dichloropropane . 5.00 Trichloroethene ..... 5.00 Dibromochloromethm~e 5.00 1,1,2-Trichlo roetheme 5. O0 Benzene ......... ~,. 00 10061-01-5 cis~l, 3-Dichloropropene 10061-02-6 trans- 1,3-Dichloropropene 75-25-2 591-78-6 127-18-4 79-34-5 108-88-3 108-90-7 100-41-4 100-42-5 1330-20-7 74-97-5 74-87-3 LOW 5.00 5.00 Bromoform . . . . ..... 5.00 2-Hexanone ........ 5. O0 Tetrachloroethene .... 5.00 1,1,2,2-Tetrachloroethea~e 5.00 Toluene ......... 2. O0 Chlorobenzene ...... 5. O0 Ethylbenzene ....... 2.00 Styrene ......... 5.00 Xylene (total) ...... 2.00 Bromochloromethane . 5.00 ~loromethea~e ...... 5. O0 CAS Nt~ber 59O-20-7 563-58-6 75-25-2 74-95-3 142-28-9 630-20-6 75-00-3 106-93-4 75-09-2 156-59-4 96-18-4 98-82-8 75-35-4 108-86-1 95-49-8 103-65-1 106-43-4 108-67-8 98-06-6.. 95-63-6 541-73-1 135-98-8 106-46-7 99-87-6 95-50-1 104-51-8 96-12-8 91-20-3 87-61-61 87-68-3 Date ExtraCted: Date Analyzed: DilutiOn.Factor: - u~/K~ 2,2-Dichloropropane 5.00 1,1-Dichloropropene 5.00 Bromomethane . . .'.... 5.00 Dibromomethane ...... 5.00 1,3-Dichloropropane 5.00 1,1,1,2-Tetrachloroethane 5.00 Chloroethane ....... 5.00 1,2-Dibromoethane .... 5.00 Methylene Chloride .... 5.00 cis-l,2-Dichloroethene 5.00 1,2,3-Trichloropropane 5.00 Isopropylbenzene ..... 5.00 1,1-Dichloroethene .... 5.00 Bromobenzene ....... 5.00 2-~lorotoluene ..... 5.00 n-Propylbenzene ..... 5.00 .< 4-chlorotoluene ..... 5.00 < 1,3,5-Trimethylbenzene 2.00 < tert-Butylbenzene .... 5.00 < 1,2,4-Trimethylbenzene 2.00 < 1,3-Did~lorobenzene 5.00 < sec-Butylenzene ..... 5.00 1,4-Dichlorobenzene 5.00 < ~Isopropyltoluene .... 5.00 < 1,2-Dichlorobenzene . . . 5.00 < n-Butylbenzene ...... 5.00 < 1,2-Dibromo-3-chloropropanelO.O < Naphthalene ....... 5.00 < 1,2,3-Trichlorobenzene . 5.00 Hexachlorobutadiene 5.00 < The Lab ID for data on this page is RKllX08C5. < - Compound not detected above the listed minim~ detection limit. Data Release Authorization: ~'~?~ page 2 VOLATILE ORGANICS ANALYSIS DATA SHEET TENTATIVELY IDENTIFIED COMPOUNDS* NTL Sample ID: 060890C-5 Date Received: 06-08-90 Date Analyzed: 06-22-90 Time Analyzed: 18:57 Dil. Factor: Date extracted: 06-22-90 Reporting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil Constituent None Found. CAS Run Analysis Number Time Results * Up to ten of the largest non-target analytes were selected. Identification is based upon analyst interpretation of spectra and a computer search against our 70,000 compo~md NB Library database. Qu~titation estimate is based upon ~ ass~ed one to one response with the closest non-contaminated internal standard. California DOHS Certification N~ber 225 Additional Con~ents: xlcolog¥ Laboratories 1100 California Ave. Bakersfield, California 93304 8051322-4250 8001350-3515 · Nm'%h~.C. Jain;Ph.D. . -..Lab~at~Director' Thomas C, Snsath, B.S. ..,. ~,.- ,~Chief Toxicologist FAX 8051322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06006 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesel PROJECT: ARCO So. "H" NTL LAB #: O6089OC-6 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT RESULTS ,, MRL Total Petroleum Hydro- carbons as Diesel None Detected 10.OO ug/gm MRL = Minimum Reporting Level DATE REPORTED: 06/13/90 DATA RELEASE AUTHORIZED BY: California D.O.H.S. Cert. t~ 225 ~TILE Laboratory Name: N.T.L.- INC. Lab Sample ID: 060890C-6 -- Client Sample. ID:: 6006 ORGANICS ANALYSIS DATA Concentration: Sample Matrix: Percent Moisture: LOW Date Extracted:' SOIL Date Analyzed: fl~ DilutionFaetor:.~ 1.0 METHOD 8240 CAS Nt~ber ua/Ka CAS Nt~ber 67-64-1 Acetone ......... 77.6 590-20-7 107-02-8 Acrolein ......... 50.0 <. 563-58-6 75-15-0 Carbon Disulfide .. 5.00 < 75-25-2 75-34-3 1,1-Dichloroethane . . 5.00 < 74-95-3 --156-60-5 Trans-l,2-Dichloroethene . 5.00 < 142-28-9 67-66-3 Chloroform ........ 5.00 < 630-20-6 107-06-2 1,2-Dichloroethane . - 5.00 < 75-00-3 78-93-3 2-Butanone (MEK) ..... 20.0 < 106-93-4' 108-10-1 4-Methyl-2-Pent~]one (MIBK)IO.O < 75-09-2 71-55-6 1,1,1-TrichloroeO~ane 5.00 < 156-59-4 56-23-5 Carbon Tetrachloride 5.00 < 96-18-4 75-27-4 Bromodichloromethane 5.00 < 98-82-8 78-87-5 1,2-Dichloropropmie 5.00 < 75-35-4 79-01-6 Trichloroe~ene ..... 5.00 < 108-86-1 124-48-1 Dibromochloromethane 5.00 < 95-49-8 79-00-5 1,1,2-Tri~loroe~tane 5.00 < 103-65-1 71-43-2 Benzene ......... 2.00 < 106-43-4 10061-01-5 cis-l,3-Dichloropropene 5.00 < 108-67-8 10061-02-6 trans-l,3-Dichloropro~ne 5.00 < 98-06-6 75-25-2 Bromoform ........ 5.00 < 95-63-6 591-78-6 2-Hexanone ........ 5.00 ..': 541-73-1 127-18-4 Tetrachloroethene .... 5.00 < 135-98-8 79-34-5 1,1,2,2-Tetrachloroethane 5.00 < 106-46-7 108-88-3 Toluene ......... 2.00 < 99-87-6 108-90-7 Chlorobenzene ...... 5.00 < 95-50-1 100-41-4 Ethylbenzene ....... 2.00 < 104-51-8 100-42-5 Styrene ......... 5.00 < 96-12-8 1330-20-7 Xylene (total) ...... 2.00 < 91-20-3 74-97-5 Bromochlorometh~le .... 5. O0 < 87-61-61 74-87-3 Chloromethea~e ...... 5.00 < 87-68-3 uR/K~ 2,2-Dichloropropane . 5.00 < 1,1-Dichloropropene 5.00 < Bromomethane ....... 5.00 < Dibromomethane ...... 5.00 < 1,3-Dichloropropane 5.00 <. 1,1,1,2-Tetrachloroethane 5.00 < Chloroeth~ue ....... 5.00 < 1,2-Dibromoethmle .... 5.00 Methylene Chloride .... 5.00 < cis-l,2-Dichloroethene 5.00 < 1,2,3-Trichloroprop~]e . 5.00 < Isopropylbenzene ..... 5.00 1,1-Dichloroethene .... 5.00 < Bromobenzene ....... 5.00 < 2-chlorotoluene ..... 5.00 < n-Propylbenzene ..... 5.00 4-Chlorotoluene ..... 5.00 < 1,3,5-Trime~ylbenzene 2.00 < tert-Butylbenzene .... 5.00 1,2,4-TrimetJ~ylbenzene . 2.00 < 1,3-Dichlorobenzene 5.00 < sec-Butylenzene ..... 5.00 < 1,4-Dichlorobenzene . 5.00 < p-Isopropyltoluene . 5.00 < 1,2-Dichlorobenzene . 5.00 < n-Butylbenzene ...... 5.00 < 1,2-Dibromo-3-chloropropanelO.O < Naphthalene ....... 5.00 < 1,2,3-Trichlorobenzene . 5.00 < Hexachlorobutadiene . 5.00 < The Lab ID for data on this page is RK12X08C6. < - Compotmd not detected above the listed minim~ detection limit. Data Release Authorization' VOLATILE ORGANICS ANALYSIS DATA SHEET TENTATIVgLY IDENTIFIED COMPOUNDS* NTL Sample ID: 060890C-6 Date Received: 06-08-90 Date Analyzed: 06-22-90 Time Analyzed: 19:29 Dil. Factor: I Date extracted: 06-22-90 Reporting Units: ug/Kg Test Method: EPA 8240 Type of sample: Soil Constituent None Found. CAS R~u~ Analysis Number Time Results * Up to ten of the largest non-target ~alytes were selected. Identification is based upon analyst interpretation of spectra and a com~:ter search against our 7(I,000 compo~md NB Library database. Quantitation estimate is based u~n an ass~ed one to one response with the closest non-contaminated internal standard. California DOHS Certification N~unber 225 Additional Comments: LabotatOties ! 100 Calitornia Ave. Bakersfield, California 93304 805 / 322~1250 8001350-3515 Namalt~C?Jain;~ Thomae C; Sheath, B.S. , Chief Toxicologist. FAX 805/322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06007 DATE SAMPLE RECEIVED: 06/07/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: TPH as Diesel PRO3ECT: ARCO So. "H" NTL LAB #: 060890C-7- DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Calif. D.O.H.S. Method RESULTS: CONSTITUENT Total Petroleum Hydro- carbons as Diesel MRL : Minimum Reporting Level RESULTS MRL 14.1 ug/gm lO.O0 ug/gm DATE REPORTED: DATA RELEASE AUTHORIZED BY: ' I California D.O.H.S. Cert. # 225 lo:xlcolog¥ Laboratorxes ! 100 California Ave. Bakersfield, California 93304 805 / 322-4250 80O ! 350-3515 Thomae~C: hath; B.S. CNof~Tox ,k:o~ist · FAX 805 / 322-4322 LABORATORY REPORT ATTENTION: Mark Magargee SAMPLE ID: 06007 DATE SAMPLE RECEIVED: 06/08/90 DATE COLLECTED: 06/07/90 TEST REQUESTED: BTX & E RESULTS: PROJECT: ARCO - So. "H" NTL LAB #: 060890C-7 DATE ANALYZED: 06/11/90 SAMPLE TYPE: Soil METHOD: Modified 8020 CONSTITUENT RESULTS MRL Benzene None Detected Toluene None Detected Xylenes None Detected Ethyi Benzene None Detected MRL = Minimum Reporting Levei 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm 0.05 ug/gm DATE REPORTED: DATA RELEASE AUTHORIZED California D.O.H.S. Cert. ff 225