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HomeMy WebLinkAboutRISK MANAGEMENT 12/24/1996 HOLGUIN, FAHAN & ASSC IATF , INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS 143 South Figueroa Street · Ventura, California 93001 (805) 652-0219 · FAX (805) 652-0793 853 West 17th Street · Costa Mesa, California 92627 (714) 642-2660 · FAX (714) 642-2544 3157 Pegasus Drive · Bakersfield, California 93308 (805) 391-0517 · FAX (805) 391-0826 December 24, 1996 Mr. John M, and Mrs. Deanna J. McCauley California Sheet Metal In Care of Mr. Patrick C. Carrick Griffin · Carrick Attorneys at Law Post Office Box 2348 Bakersfield, California 93303-2348 Subject: RISK EVALUATION REPORT FOR CALIFORNIA SHEET METAL 601 EUREKA STREET, BAKERSFIELD, CALIFORNIA Dear Mr. and Mrs. McCauley: . Holguin, Fahan & Associates, Inc., (HFA) is pleased to present the following Risk Based Corrective Actions for Petroleum Release Sites (RBCA) Tier 2 evaluation for vapor-phase transport associated with remnant gasoline-containing soils associated with the' former USTs at the above referenced site. HFA utilized the previously obtained site assessment and remediation data along with RBCA Tier 2 default and site-specific input parameters in order to perform the analysis. The RBCA evaluation was conducted In conformance with the ASTM Designation: E-1739 protocols, SITE DESCRIPTION California Sheet Metal is located at 601 Eureka Street In a commercial and light Industrial district of the city of Bakersfield, California (see Figure 1 - Site Location Map). The site previously housed a single 550-gallon gasoline UST (see Figure 2 - Plot Plan Showing VES). The surrounding areas have both commercial and residential uses. Residential properties border the site to the south, and commercial properties are located to the north, east, and west of the site. SITE GEOLOGY AND HYDROGEOLOGY The site is located in a relatively flat area at an elevation of approximately 415 feet above MSL The site is located in the southern portion of the Great Valley geomorphic province. The Great Valley is a north-south trending valley, approximately 400 miles long by 50 miles wide, the southern portion of which is known as the San Joaquin Valley. 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 ENVIRONMENTAL PLANNERS · SCIENTISTS · GEOLOGISTS AND ENGINEERS Contaminated Site Assessments * Real Estate Audits * Site Remediation * Hazardous waste Management HOLGUIN; - FAHAN - ' & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMEN~I- ;CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal December 24, 1996 - Page 2 alluvial sediments are older, predominantly lake bed deposits. These lie unconformably on Mio-Pliocene marine Sediments, which extend to a crystalline basement at a depth of aPproximately 30,000 ~bg. Geologic deposits in the study'area include Pleistocene alluvial sediments of the Kern RiVer Formation, which form a h6mocline dipping gently to the southwest. The deposits .are alluvium consisting of poorly indurated and dissected fan deposits (California Division of Mines and Geology. Geologic Map of California, Bakersfield Sheet. 1965). The site is an area at the foot of rolling hills reaching a maximum elevation of 900 feet ab6ve MSL, located on the eastern flank of the San Joaquin Valley and west of the southern Sierra Nevada. The Kern River drains a large area of'the southern Sierra Nevada, including the highest part of the range at Mount whitney. The modern river has cut a channel southeast of the site and provides (e~charge for groundwater along its course. Sedimentary geologic formations, observed at the surface and underlying the site were sourced by the Sierra Nevada and transported via the ancestral Kern River. Surface water and grou_ndwater in the San Joaquin Valley are derived predominantly from the Sierra Nevada to the: east, and are transported by five major rivers, the southernmost being the · Kern River. The subject site Is located approximately 2 miles south of the Kern River. The depth to the regional unconfined aquifer mapped by the Kern County Water Agency (KCWA) is approximately 200 fbg at the site, with the direction of groundwater flow to the southwest (KCWA. February 1, 1995). The nearest known occurrence'of perched groundwater is 2 miles to the southwest at a depth of 20 fbg in the abandoned Kern River channel to the ancient Kern Lake bed (KCWA, May 1996) ..... In the region of the site, the Tertiary.sedimentary sequence from top to bottom is nonmarine Kern River Formation,.nonmarine Chanac Formatio.n, marine Santa Margarita Formation (possibly interfingering with Chanac Formation due. to the tentative correlation of type Santa Margarita Formation west of the San Andreas fault), marine Round Mountain Silt, marine Olcese Sand, marine Freeman Silt, marine Jewett S(md and Pyramid Hill member, marine Vedder Sand, nonmarine Walker Formation. Of these, only the Kern River, Chanac, and Santa Margarita formations_are important tO the hydrogeology of the site. The Tertiary, nonmarine Kern River formation is unconformably overlain by bouldery terrace deposits of Quaternary Older Alluvium. The near-surface alluvium consists of silty sands and fine-grained to coarse-grained sands, with intervals of finer grained, sandy silts and minor clay. 'Subsurface material encountered :'during previous drilling at the site was. alluvium to the total depth of each soil boring. HOLGL IN, FAHAN & A.SSC IATES, INC, ENVIRONMENTAL MANAGEMENT cONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal December 24, 1996 - Page 3 The previous assessments at the site indicate a moderately-to highly permeable, silty sand to well-graded sand secti~on to a depth of approximately 90 fbg, Two naturally occurring geologic units are present in' the near surface at the site. The two natural units are the Tertiary (Miocene to Pliocene) nonmarine Kern River Formation and Quaternary (Pleistocene)-OIder Alluvium. The Older Alluvium forms a thin terrace deposit lying unconformably on the Kern River FormatiOn. Quaternary Older Alluvium: The middle to lower Pleistocene, Older Alluvium is a flat-lying terrace deposit approximately 5 to 10 feet thick that overlies the erosional surface Of the Kern River Formation (Bartow, J.A. Geologic Map and Cross Sections of the Southeastern San Joaquin Valley, California. United States Geological Survey. Map 1-1496. 1984). The Older Alluvium is composed of very coarse material,, with boulders as large as 50 cm in diameter. Clastic material compositionincludes granitic and dioritic crystalline rocks characteristic of the Sierra Nevada batholiths, quartzite Characteristic of pre-batholithic rocks, and volcanic and related rocks such as ,andesite and dark siliceous agate typical of the Neogene deposits of the Mojave desert. In some locations, caliche rims have developed between clasts. Kern River Formation:" The age of the Kern River Formation includes upper Miocene and Pliocene and possibly~Pleistocene. The Kern River Formation is composed of interstratified fanglomeratic deposits and silty claystones. Within the fanglomerates are conglomerate beds with cobbles as large as 20 cm in diameter, and in some areas fanglomerate beds exhibit cross bedding ranging fEom 2.5 to 5 meters thick, The silty claystone beds, which would serve as Iow-permeability barriers to vertical migration, are laterally continuous to as much as several thousand feet, but are locally truncated by sandy fanglomerate units. Another important factor in considering the ~potential for migration is the lack of secondary permeability within the Kern River .Formation as no secondary cracks, small faults, or gypsum veins are observed. Chanac Formation: The cha'nac Formation of upper Miocene age is not exposed on or near the site, but outcrops in the Cliffs southeast of the site along the Kern River bluffs at Hart Park. It is a thinly bedded chalky siltstone exhibiting many secondary cracks and gypsum veins. HOL©UIN, -. FAHAN ' - & ASS(X21ATES, !Nc. ' ' ENV RONMENT~L MANAGEMEN7 COi'~ISULTANTS Mr. John M. and Mrs. Deanna_J. McCauley California Sheet Metal - December 24, 1996.- page 4 .BACKGROUND SITE DESCRIPTION AND REMEDIATION HISTORY The site previously contained a single 550-gallon gasoline UST. California Sheet Metal contracted Calpi,-Inc.,2o remove the UST on December 17, 1991. Gasoline hydrocarbon =concentrations were detected in the soil samples (S-1 and S-2) collected from beneath the UST~ On March 19, 19.92, six soil borings (B-1 through-B-6) were drilled at the site by Wilson& Associates, Inc., and on-March 8, 1993, three additional soil borings (B-7 through B-9) were drilled at the site .by Piwarea Engineering, Inc. The soils investigations indicated 'TPH as-gosoline concentrations to depths less than 75 fbg and less than 45 feet laterally from the former UST location (see A~tachment 1 for a summary of previous work). On January 17 and 18, 1994, HFA drilled and installed six vapor extraction wells (VW-1 through VW-6). HFA connected the wells with 3-inch-diameter piping to a central .manifold (see Figure 2). On-November 28, 1994, HFA acquired ATC Permit #S-2660-1-0 for a VES utilizing a King, Buck/Hasstech, Inc., l'50LScfm direct-fired thermal oxidizer for the in-situ vapor extraction of volatile hydrocarbons in the soils at the site. Subsequently, the system was delivered and installed at the site. On July 17, 1995, HFA conducted a source test of the treatment unit in compliance with the requirements of the ATC permit. Based'0n the vapor sampling and analytical results, the' efficiency of the direct-fired, thermal oxidation system Was greater than 99,8 percent, the maximum VOC emission was 1.4 ppmv, and the benzene emission was less than 0.03 ppmv. Therefore, ~he source test demonstrated compliance with the conditions of the ATC permit (see Attachment 1). HFA subsequently requested that the ATC permit be upgraded to a PTO. During the first 4 weeks 0f.0peration, high VOC concentrations and oxygen deficiency In the soil caused the unit to frequently shut down. During this time, vapor wells VW-1 and VW-2 were used as extraction wells While vapor wells VW-3 through VW-6 were used as air inlet wells, and the dilution air valve was Completely open. As soil conditions improved, dilution air was slowly decreased until no ·dilution air was required, and well VW-3 was brought on line as an extraction well. HFA has operated the unit 24 hours per day since August 14, 1995, with only short periods of inactivity for maintenance, draining of the knockout pot, and a few occurrences when the system has shut down. As 6f the end of the third quarter of 1996, HFA estimated the mass of gasoline hydrocarbons extracted from the subsurface since start-up to be approximately 13,370 pounds, which is equivalent to approximately 2,089 gallons of gasoline. However, with the diminished volume of hydrocarbons in the subsurface resulting in frequent system shutdowns only 733 POunds of hydrocarbons was removed during the third quarter of 1996. .HOmUI.N, FAHAN _ & AssOcIATES, INC. ENVIRONMENTAL MANAGEMENT coNsULTANTS Mr. John M.' and Mrs. Deanna J. M¢Couley California Sheet Metal ' December 24, 19~6 - Page 5 '--Therefore, on SePYember d,' 1'9961HFA drilleEI .three S0il borings (B-10 through B-12) in and around the location of the former USTs to assess the"progr~ss of achieving the Bakersfield Fire .Department Hazardous ~Mate_rials-DivisiOn (BFDHMD) UST Local Oversight Program (LOP) cleanup levels at the site:(see Figure 2 for verification soil:boring locations). Soil boring B-10 was drilled to a depth of 91 fbg through the location of the former UST, and soil borings B-11 and B-12 were drilled to a de'pt':of 51 fbg at locations laterally:from the former UST. Analysis of soil samples collected from soil boring B-10 indicated detectable TPH as gasoline and BTEX concentrations in the interval ranging in depth from 15 to 65 fbg, with benzene concentrations detected at a-maximum concentration of 34 mg/kg in the s0il sample collected from a depth of 65 fbg (see Attach~nent 1). Analysis of soil samples indicated detectable TPH as gasoline concentrations 'in the soil sample collected from a depth of 30 fbg in soil boring B-11 and in the soil sample collected'from a depth of 25 fbg in soil boring B-12 (see Attachment 1). One result of the progress soils assessment is that a significant reduction :in the Concentration of gasoline hydrocarbon~ from the original maximum TPH as gasoline and benzene concentrations of 30,000. mg/kg and 1,000 mg/kg, respectively, has been achieved. Another result is that the lateral areas of the original vadose zone plume indicate., only rdsidual hydrocarbon concentrations in tl~e soil compared to the original maximum lateral TPH as gasoline and benzene concentrations of 7,000 mg/kg and 42 mg/kg, r. espectively. However, significant concentrations of gaSOline hydrocarbons remain in the central area of the vadose zone plume, with a maximum TPH as.gasoline concentration of 5,900 mg/kg and a maximum benzene concentration of 34 mg/kg Given' the results of the remediation progress soils assessment, and in accordance with the Lawrence Livermore :National Laboratory's Recommendations to Improve the Cleanup Process for California's Leaking Underground Fuel Tanks report dated October 16, 1995, and the State Water Resources Control Board's Underground Storage Tank Cleanup Fund Technical Review Guidance Document No. 4 dated December 27, 1995, Mr. John M. and Mrs, Deanna J~ McCauley requested that the BFDHMD UST LOP provide written guidance pertaining to the additional remediation activities required at the site. The BFDHMD UST LOP, in its letter dated October 23, 1996, responded that a risk evaluation of potential exposure of the remaining hydrocarbons'in the subsurface to potential recePtors would be required prior to consideration of the site for closure. Mr. and Mrs. McCauley subsequently requested that HFA prepare a risk evaluation in conformance with ASTM Designation: E-1739 protocols, lhe ~esults of the risk evaluation are presented in this report. HOLGUIN, FAHAN & IATES, INC. ENVIRONMENTAL MANAGEMENT coNsuLTANTS Mr. John M~ and Mrs. Deanna J. McCauley California Sheet Metal .. ~ December 24, 1996 - Page 6 HUMAN HEALTH AND ENVIRONMENTAL RISK ASSESSMENT CHARACTERISTICS OF GASOLINE Gasoline is a clear, flammable, volatile liquid with a characteristic odor. It is a complex mixture of paraffinic, olefinic, and aromatic hydrocarbons ranging from C4 to C~2 compounds. As many as 250 separate hydrocarbons can be found in various commercial gasolines. A typical modern gasoline composition would be 50 to 80 percent paraffins, 10 to 40 percent aromatics, and 5 to 10 percent' olefins. Gasoline CAS Number: 8006-61-9 Benzene CAS Number: 71-43-2 Toluene CAS Number: 108:88-3 Ethylbenzene CAS Number: 100-41-4 Xylene CAS Number: 1330-20-7 Benzene Chemical Formula: C6H6 Toluene Chemical Formula: C7H8 Ethylbenzene Chemical Formula: C8Hla Xylene Chemical Formula: C8H10 TABLE 1. CHEMICAL AND PHYSICAL PROPERTIES OF GASOLINE Molecular Weight Boiling Point Melting Point Flash Point Autoignition Temperature Explosive Limits Vapor Density Specific Gravity~ Solubility in Water Solubility in Organics >39°C, 77-121°C (50% distilled), <240°C -90.5 to -95.4°C -45 to ~50°C 536 to 853°F 1.4% to 7.6% 3.0 to 4.0 0.72 to 0.76 at 60°F Insoluble Soluble in most common organic solvents HUMAN HEALTH RISK ASSESSMENT Gasoline is a suspected human carcinogen. A TLV of 300 ppm or 900 mg/m3 has been assigned to gasoline. This value of 300 ppm was assigned based on an average of 3 percent benzene (10 ppm TLV)~n gasoline. Low-level inhalation exposure to gasoline can cause irritation to the eyes, nose, and respiratory system; headac, hei and nausea. Acute toxicity is --similar-for- all ~g~solines. Gasolines act as an anesthe, tic and are mucous membrane HOLGUIN, :" : FAHAN & ASS( NT , INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. ~Jol~n M. and Mrs. Deanna J. McCauley California Sheet Metal - ~ December 24, 1996 - Page 7 inhabitants. The hazard is high because of the ease in which harmful conc~)ntrations may develop. Inhalation is the most important route of Occupational entry. Acute symptoms of intoxication, headache, blurred vision, dizziness, and nausea are the most common symptoms resulting from excessive ~aPor exposure. ~Reported responses to gasoline vapors are: 1. eye and throat irritation within several hours at a concentration of 160 to' 270 ppm; 2. eye, nose, and throat irritation and dizziness within 1 hour at a concentration of 500 to 900 ppm; and 3. mild anesthesia within 30 minutes at a concentration of 2,000 ppm. Higher concentrations are intoxicating within 4 to 10 minutes. The.threshold concentration for immediate mild toxic effect is 900 to 1,000 ppm. Inhalation of high concentrations can cause fatal pulmonary edema. There are reports of toxic neuritis following exposure to gasoline. Repeated or prolonged skin exposure causes dermatitis and can cause blistering of the skin due to gasoline's defatting properties. Repeated or prolonged exposure to eyes can cause hyperemia of the conjunctive. Ingestion can cause inebriation, drowsiness, blurred vision, vertigo, confusion, vomiting, and cyanosis. Aspiration after ingestion causes bronchitis, pneumonia, or edema, which can be fatal. The chemical components of gasoline that are the most toxic are the volatile aromatic compounds benzene, toluene, ethylbenzene, and xylenes. A TLV.of 10 ppm or 30 mg/m3 has been assigned to benzene. Benzene has a Iow odor threshold limit of 1.4 ppm. Low-level inhalation exposure to benzene can cause irritation to the eyes, nose, and respiratory system; headache; and nausea. A TLV of 100 ppm or 375 mg/m3 has been assigned to toluene. Toluene has a Iow odor threshold limit of 2.1 ppm. Low-level inhalation exposure to toluene can cause fatigue, weakness, confusion, and euphoria. A TLV of 100 ppm or 435 mg/m3 has been assigned to ethylbenzene. Ethylbenzene has a Iow odor threshold limit of 2 ppm. Low-level inhalation exposure to ethylbenzene can cause irritation to the eyes and mucous membranes. A:TLV of 100 ppm or 435 mg/m3 has been assigned to xylene. No Iow odor threshold limit has been established for xylene0 Low-level inhalation exposure to xylene can cause dizziness, excitement, and drowsiness. Benzene poses the greatest relative health risk because it is more mobile in the environment than the other aromatic compounds and is a known carcinogen. Therefore, the physical and chemical characteristics of benzene are generally evaluated as an indicator compound rather than evaluating health risks posed by gasoline as a whole. Animal studies have shown that benzene exposure may result in hematological abnormalities such as leukemia, anemia, lymphocytopenia, bone marrow hypoplasia, and _other carcinogenic and reproductive effects (IARC, 1982; NIOSH,-198-7; NTP, 1986; ATSDR, 1987). ChroniC eff_e.c:ts_Observed. _ .. in humans exposed to benzene !nclude carcin_o.genic, HOLGUIN, FAHAN & ASSOCIATe, INc. ENVIRONMENTAL MANAGEMENT CONSULT:ANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal December 24, 1996 - Page 8 hematopoietic, .and cytogen~c AP1,1986),' ..... abnormalities (Klaassen, et al., 1986; EPA, 1982; IARC, 1982; PHYSICAL AND CHEMICAL-CHARACTERISTICS OF BENZENE Benzene is a colorless aromatic hydrocarbon that is moderately volatile with a relatively high water solubility and a Iow chemical reactivity due to its stable ring structure (Klaassen, 1986). ~The benzene component in Chevron's unleaded gasoline ranges from 1.5 to 4.9 percent. The table on tl~e following page summarizes the physical and chemical properties of benzene. TABLE 2. PHYSICAL AND CHEMICAL PROPERTIES OF BENZENE PROPERTY VALUE REFERENCE Merck, 1983 molecular weiqht melting point boiling point specific gravity solubility Henry Law Constant vapor pressure partition coefficient: Log KOw diffusion coefficient: air water EstimateS of tt~e benzene are: 78.11 g/mole 5.5 °C 80.1 °C 0.88 1750 mg/I (25 °C) .0055 atmm3/mol 76 mm Hg (20 °C) 98 2.13 8.8x10-6 m2/s 9.8x10'10 m2/s Howard, 1990 Howard, 1990 Chevron, 1993 .Banerjee, 1990 Mackay & Shiu, 1981 Howard, 1990 Howard, 1990 Howard, 1990 EPA, 1989 I EPa, 1989 (~arcinogenic risks associated With life exposure to various concentrations of TABLE 3. LIFE EXPOSURE CARCINOGENIC RISKS Risk USEPA Concentration CCR Title 22 Concentration 10-5 50 pg/J 10 pg/I 10-6 5 pga 1 10-7 0.5 pga 0.1 pg/I CAG Unit Risk (USEPA): Unit Risk (CCR Title 22): NIOSH Recommended. Standard: ' - - ACGIH~TLV: 0.029 (mg/kg/day)~'] 0.1 (mg/kg/day) -1 1.0 pg/m3 TWA . HOLGUIN, ~ .... .-.. Mr.~John M. and Mrs. Deanna J. McCaule_y FAHAN .. :' -. California Sheet Metal & ~IATF~_~, INC. ':;~ .... :, December 24, 1996- Page 9 '" ~N-~/IFIONMENTAL MANAGEMENT OONSULTANTS RISK EVALUATION POTENTIAL ExPOSORE PATHWAYS FOr a typical gasoline'release from a UST system, the potential exposure pathWays include 'ingestion of h~)~r0cc~boh-containing soil or groundwater, breathing volatile vapors, or :dermal exposure to hydrocarbon-containing soil or groundwater. RBCA TIER 1 RISK EVALUATION HFA utilized the ASTM Designation: E-1739 Tier 1 RBSL worksheets and Look-Up Tables to assess the lifetime one-ima-miIliOn (lx10-6) health risk for the following residential exposure pathways: 1. soil volatilization to outdoor air; and 2. soil vapor intrusion from soil to buildings. The following parameters were used. to establish the .site-specific initial conditions. The remnant hydrocarbon plume has a maximum length of 30 feet southeast to northwest, a maximum width of 20 feet northeast to southwest, and is present from no shallower than 15 fbg-to no deeper than 65 fbg._ The'gasoline-containing soil plume is located beneath the parking area southeast of the commercial building on the' property and north of an adjacent residential home. However, no gasoline-cOntaining soils are known to be present beneath either the commercial building or the residential home. Within the remnant plume, the maximum concentration of benzene is 34 mg/kg, toluene is 200 mg/kg, ethylbenzene is 340 mg/kg, and total xylenes is 320 mg/kg. Benzene' concentrations in excess of 1 mg/kg are confined to the interval ranging -in depth from 30 to:65: fbg. Ail other input parameters were the Tier 1 default values including a soil density of 1.7 g/cm2,.porosity of 0.38, volumetric water content of 0.12, air content of 0.26, ~rganic E:'arbon fraction Of 0.01, foundation thickness of 6 inchesl and foundation crack fraction of 0.0'1 The result of the AsTM E~S 1739 RBCA Tier 1 risk evaluation is that. the concentration of the carcinogen benzene exceeds the RBSL (see Attachment 1 for the RBCA Tier 1 worksheets and dose/response calculations for lifetime ixt0-6 exposure). In accordance with RBCA, either additional mitigation is to be undertaken to reduce the exposure to below lx10-6 exposure levels, or additional Tier 2 s. ite-specific modeling is to be conducted to assess whether the concentration detected in thels°il exceeds the lx10-6 exposure leVels at the receptor location 'for each exposure pathway. This is done by either collecting long-term, site-specific analytical data at each receptor location or by modeling the fate and mobility of the contamination from its current location-to each receptor location. It is' important to not~ that'.the California unit cancer risk slope factor for benzene is 0.1 (rog/kg/day) -1 as compared to ~he United State Environmental Protection Agency (USEPA) HOLGUINi' ~- FAHAN & ASS(~IATES, INc. .~ENV[RoNk4ENTAL MANAGEMENT CONSULT~;NTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal December 24, 1996 ~ Page 10 slope factor of 0.029 (mg/kg/day) -1, and' the risk assessment models have been adjusted for application in the state of California. Numerical evaluation of the risk to groundwater resources was not conducted in association with this risk evaluation because effects on groundwater resources are not anticipated since more than 150 feet of separation exists between the deepest known gasoline-containing soils and the first occurrence of groundwater, and intervening barriers to hydrocarbon migration are present. Numerical evaluation of the risk from ingestion of gasoline-containing soils was als0 not conducted in association with this risk evaluation, because the shallowest known gasoline-containing sbils are at a depth of 10 fbg, and the entire area of the gasoline-containing Soils is covered by asphalt. RBCA TIER 2 RISK EVALUATION HFA utilized the RBCA contaminant fate and transport modeling algorithms to assess the site-specific exposure levels at each receptor to determine whether these levels exceed permissible lx10-6 exposure levels. Input parameters were similar to the Tier 1 assessment, with the exception that the dimension of the hydrocarbon-containing soils was limited to the gasoline-containing zone ranging in depth from 30 to 65 fbg where benzene concentrations exceed 1 mg/kg with an average benzene concentration of 10 mg/kg used to model the risk from this interval of gasoline-containing soil, and the volumetric water content was increased to 0.2 to be more representative of in-situ moisture conditions. The contaminant fate and transport modeling indicates that the maximum potential benzene exposure level for the indoor and outdoor air inhalation pathways do not exceed the permissible lx10-6 exposure level for the proposed commercial use (see Attachment 2 for the RBCA Tier 2 fate and transport modeling worksheets and dose/response calculations for lifetime lx10-6 exposure). CONCLUSIONS Active remediation has been effective in removing gasoline hydrocarbons from the subsurface at the site and would continue to be effective in removing the remnant concentrations in' the soil. However, if the BFDHMD UST LOP approves of the discontinuation of active remediation activities, then the conclusion of the RBCA Tier 2 risk evaluation is that the remnant concentrations of gasoline hydrocarbons within the soils at the site do not exceed the levels appropriate for the current commercial use of the ~)roperty and do not present an excessive risk of exposure to the adjacent residence. HOLGUINI FAHAN . & A _qOCIATE , INC. ENVIRONMENTAL MANAGEMENT CONSULTANTs Mr. John-M; and Mrs. Deanna J. MbCauley California Sheet Metal December 24, 19~,6 - Page 11 Holguin, Fahan & Associates, Inc., trusts_that you will find this Risk Evaluation Report to your satisfaction. The services performed by Holguin, Fahan & Associates, Inc., were conducted in a manner consistent with the level of care and skill ordinarily exercised by members of its profession currently practicing under similar conditions in the state of California. No other warranty is expressed or implied. If you have any questions or require additional information, Magargee at (805) 391-0517 or at e-mail address please contact Mr:-Mark Mark_Magargee@lifa.com. Respectfully submitted, Mark R. Magargee, CHG, RG Senior Hydrogeologist Holguin, Fahan & Associates, Inc. MRM:rri Enclosures: Figure 1 - Site Location Map Figure 2 - Plot Plan Showing VES Attachment 1 - Summary of Previous Work Attachment 2 - RBCA Tier 1 Worksheets and Dose/Response Calculations Attachment 3 - RBCA Tier 2 Fate and Transport Modeling Worksheets and -- Dose/Response Calculations cc: Mr. Howard H. Wines, III, BFDHMD UST LOP- Mr. Patrick C. Carrlck, Griffin · Carrick FAI-I~N. & ASSCXSIATES, INC. EI~V'IR.ONMENTAL MANAGEMEN'~' CONSULTANTS Mr. John M. and :Mrs. Deanna J. California Sheet Metal December 24, 1996 - ~oge 12 J~rive-in f,heat~ o ° I' 'COUNI¥ LEGEND 0 0.5 ': ' : ' . siMILE'. I I I f~ I; 4"--I . i. _.1 %1, 0 - 1,000 2~000 , 3.000 4,000 5,000 FEET ' . .b-J~J--I H . I- -~ I : _ I 388 --_ UC IIIII ~C~. NTERK)IL _DN-E 7 5 M NUTE SERIES QUADRANGLES GOSFOR[:)/LAMONT/OIL 4 , JOHN M. AND MRS. DEANNA J. McCAULEY _. CALIFORNIA SHEET METAL 60_1 EUREKA STREET ' : BAKERSFIELD, CALIFORNIA - FIGURE 1 - SITE LOCATION MAP HOLGUIN, FAHAN & AsSOcIATES, INC. HOLGUIN, ~' FAHAN . ~ & ~~TES, INC. .ENVIRONMENTAL I~AN~,GEMENT C~ONSULTANTS Mr. John M~ and Mrs. Deanna --J. McCauley California. Sheet Metal December 24, 1996 - Page 13 : EUREKA STREET :/ : SIDEWALK ' / : Gal.e_.. ~-~AI~-LIN-~' FENCE ~'~,~ ':-- o3 CALIFORNIA Z SHEET METAL n'- ~BUILDING _ CONCRETE · ' LIMIT OF '.A ~ GASOLINE-CONTAINING CANOPY ' SOILS ~, ~ - ~ ' vw-~i ' '~ ' .- I ......... -J___~ ............ ~_..~ANK-~XCAgAT~ON \ VES ~_~_ MANIFOLD . ' '~-6 ' -- CHAIN-LINK FENCE SCALE IN FEET ALLEY 0 10 20 LEGEND MR. JOHN M. AND MRS. DEANNA J. McCAULEY - CALIFORNIA SHEET METAL )~ VAPOR EXTRACTION WELL 601 EUREKA STREET ..... -- ~ :' ' ":' ~ ' ~-~ BAKERSFIELD, CALIFORNIA ~ ~: '~:~i .; ' ': ' FIGURE 2 - PLOT PLAN SHOWING VES ~:~)~ V ERI FiCA"TION ~OIL BORING: .. ~ : - : 7 ~ HOLGUIN, FAHAN & ASSOCIATES, INC. ' ::.t REVISION DATE: OCTOBER 11, 1996: RRI -. ' ~: : ~' - &-~IATEs, INC. · EN¥1ROb~IMENTAL MANAGEr~4ENT CONSULTANTS ATTACHMENT 1. SUMMARY OF PREVIOUS WORK EUREKA STREET SIDEWALK GA T~.J CHAIN-LINK FENCE 03 CALIFORNIA Z SHEET METAL n- BUILDING ""' CONCRETE SLAB , ~ CANOPY , ~, , · B-9 B-8 B-6 B-S g 2: Bi1 .~--- , B-2 O ' ~ '~ .... LIMIT OF \. ,' TANK EXCAVATION B-4 SCALE IN FEET ~ CHAIN-LINK FENCE 0 I0 20 B-7 ALLEY LEGEND MR. JOHN M. AND MRS. DEANNA J. McCAULEY ~ ~ SOIL BORING CALIFORNIA SHEET METAL 601 EUREKA STREET BAKERSFIELD, CALIFORNIA FIGURE 1 - PLOT PLAN HOLGUIN, FAHAN & ASSOCIATES, INC. REVISION DATE: OCTOBER 11, 1996: RRI <150 VW-1 VW-2 VW-3 VW-4 VW-5 VW-6 ATMOSPHERE KNOCK-OUT DRUM INFLUENT MONITORING POINT .J J <150 scfm BLOWER WITH T SILENCER SUPPLEMENTAL FUEL EFFLUENT MONITORING POINT THERMAL/ CATALYTIC OXIDIZER NOT TO SCALE LEGEND X PRESSURE OR VACUUM GAUGE ~' VALVE I o I FLOW GAUGE ~ SAMPLE TAP REVISION DATE: FEBRUARY 8, 1996: RRI MR. JOHN M. AND MRS. DEANNA J. McCAULEY CALIFORNIA SHEET METAL 601 EUREKA STREET BAKERSFIELD, CALIFORNIA FIGURE 2 - VES SCHEMATIC DIAGRAM HOLGUIN, FAHAN & ASSOCIATES, INC. FIGURE 3 - INFLUENT AND EFFLUENT TPH CONCENTRATIONS 10,000 1,000 100 10 TPH In '~ - - - - ~"~ TPH Out 0.1 5 10 15 20 25 30 Cumulative Operating Weeks 35 FIGURE 4 - CUMULATIVE EXTRACTION CURVE 15,000 10,000 5,000 10 15 20 25 Cumulative Operating Weeks 3O 35 TABLE 1. SUMMARY OF SOIL SAMPLE ANALYTICAL RESULTS FOR TANK REMOVAL CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA SAMPLE / DATE ~ SAMPLE TPH AS ETHYL- TOTAL SOURCEiSAMPLED DEPTH I.D. GASOLINE BENZENE TOLUENE BENZENE XYLENES REF (fbg) t (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EPA ANALYTICAL METHOD ! 8015 (M) 8020 N/A MINIMUM REPORTING LEVEL I 1.0 0.005 0.005i 0.005 0.005 N/A s-2 !~2-17-9~i ~2 ' s-2-12 , ~0,000 98i 275] 290 A REF = Report reference. N/A = Not applicable. A = Calpi, Inc.'s, report dated September 1992. TABLE 2. SUMMARY OF SOIL SAMPLE ANALYTICAL RESULTS CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA SAMPLE I DATE SAMPLE TPH AS ~ ETHYL- TOTAL TOTAL ORGANIC SOURCE SAMPLED DEPTH I.D. GASOLINE BENZENE TOLUENE BENZENE XYLENES LEAD LEAD ,REF I I (fbg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) , (mg/kg) (mg/kg) EPA ANALYTICAL METHOD I 8015 (M) 8020 I 7420 N/A METHOD REPORTING LIMIT VARIES-SEE LABORATORY REPORTS N/A B-1 I 3-19-92 5 B-1-5 6,000, ND(>20)I 210 5_~0 1,9601 .... 39. 2.7 A 3-19-92 15 B-1-15 6,000 ND (>100) 390 170 1,2901 -- , -- A 3-19-92 30 9-1-30 3,100 ND (>2.0)_~____ 86 71 438L_- 4.~ -- A 3-19-92 45 I 9-1-45 3,000 5.01 160 75 390t -- J, -- A !--3-19-92 60 I' B-1-60 13,000 110 _ 1,300 3002,560[_ --A t 3-19-92 75 I~ B'1-75 ND NDi --eND ND ND{ -- A 3-19-92 80 B-1-80 ND ND ND ND NDi -- I -- A i 3-19-92 90--I-B-1-90 ND 0.16 0.049 0.088[ .... A B-2 3-19-92 15 I B-2' 15 12,000 1,000 ____ 1,500 340 2,480 ]__'_-_ -- A 3-19'92 30 B'2-30 400 0.2 1.2 4.7 491 3.9 -- A B-3 3-19'92 30 B'3-30 30,000 400 3,400 800 4,300t .... A B-4 3'19-92 30 B-4-30 ND ND ND ND NDI .... A 3'19'92 40 B'4'40 ND ND ND ND NDI .... A B-5 3-19-92 15 B-5-15 ND 0.011 0.017 ND ND _ -- -- A 3-19-92 40 B-5-40 7,000 42 540 160 8101 .... A B-6 3-19-92 20 B-6-20 ND ND ND ND NDI 3.6 -- A 3-19-92 30 B-6-30 ND ND - ND ND ND! .... __ A 3'19-92 40 B-6'40 ND NO 0.008 ND 0.011 8.5 '- A B-7 IL 3-8-93 20..t. B-7-20 ND ND ND ND NDI___-- -- B 3-8-93 30 _. B-7-30 ND ND ND ND ND_I- --__ -- 3'8-93 50 B-7-50 ND 0.064 --- 0.029 ND 0.015! .... B ....B-8 3-8-93 20__!_ B-8-20 ND ND ND ND! NDJ .... B 3-8-93 35 ' B-8-35 ND 0.079-- 0.11 ND 0.0g~---- -- B ND?_ B__ B-9 3-8-93 3__0_ .... _B_-9-30 ND ND ND ND .... 3-8-93 40 B-9-40 ND ND ND ND ND ___ -- B 3-8-93 150 B-9-50 ND 0.11i- 0.027 ND 0.0451 -- ! -- B REF = Re )orr reference. N/A = Not applicable. ND = Not detected. -- = Not anal,¢zed. A = Wilson & Associates, Inc.'s, report dated September 1992. B = Piwarea Engineering, Inc.'s, report dated April 1993. TABLE 3. SUMMARY OF SOIL SAMPLE ANALYTICAL RESULTS FOR REMEDIATION PROGRESS ASSESSMENT CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA ~ I i I I ETHYL- TOTAL SAMPLE i DATE SAMPLE, TPHAS i , SOURCE SAMPLED DEPTH I I.D. i GASOLINEIBENZENE TOLUENE' BENZENE XYLENES REF ' (fbg) i (mg/kg)I (mg/kg) (mg/kg) (mg/kg) (mg/kg) EPA ANALYTICAL METHOD ~, 8015 (M) t 8020 N/A METHOD REPORTING LIMIT } 10i 0.005t 0.0051 0.0151 0.015 N/A B-10 I 9-4-96 15 I B-i0-15i 2,400 ND 200I__ 25 300 A 9-4-96 25 B-10-25 I 4,200 ND 29 48 160 A 9-4-96 35 B-10-35 ] 2,800___ 14 39 49 74 A t 9-4-96 45 i B'10-45 ii .......... 190 ND 0.24! 0.53 8.3 A !_ 9-4-96 55 [ B-10-55 ! 5,900! 8.1[ 501 ..... 97 160 A ! 9-4-96 65 I B-10-65 i 2,6001 34 140~ 340-- 320 A !l 9-4-96 75 t B-10-75 i NDI ND 0.024 ND 0.037__ A , 9-4-96 ~- 85 { B-10-85I ND 0.72 0.77 0.061 0.34 A I 9-4-96 90 B-10-90 i ND 0.36 0.52 0.039 0.2 A B-11 I 9-4-96 15i B-11-15 i ND ND ND ND ND A 9-4-96 30 B-11-30 I 260 ND 0.015 0.029 1.4 A 9-4-96 45___ __B_-_I 1-4___~_5 i ____ ND N__D ND ND ND A B-12 i 9-4-96 10 B-12-10 i ND ND ND ND A_ I 9-4-96 25 B-12-25 I 1,400 0.0054 0.16 3.4 35 A I 9-4-96 40 B-12-401 ND 0.0083 0.06~ 0.047 0.47 A 9-4-96 50 B-12-50 ~ ND ND NDI ND ND A REF = Re )ort reference. N/A = Not applicable. ND = Not detected. A = Holguin, Fahan & Associates, Inc.'s, current report. TABLE 4. SUMMARY OF SOURCE COMPLIANCE MONITORING ANALYTICAL RESULTS CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA. ~ DatE] I tPhaS Iil ETHYL-I TOtaL SAMPLE SOURCE SAMPLED ] SAMPLE I.D. GASOLINE BENZENE / TOLUENE BENZENE XYLENES REF I (ppmv) [ (ppmv)t (ppmv) (ppmv) (ppmv) EPA ANALYTICAL METHOD 8015 (M) I 8020 N/A METHOD DETECTION LIMIT VARIES-SEE LABORATORY REPORTS N/A INFLUENT ! 7-17-95 ! 95-8623-2 702 33.94 83.19 5.50! 42.92 A EFFLUENT ! 7-17-95 ] 95-8623-1 1.4 ND 0.08 ND 0.14 A INFLUENT j 3-6-96 I 96-0695 1,900 92 210 32 190 B EFFLUENT i 3-6-96 I 96-0696 ND 0.56 0.29 0.07 0.15 B INFLUENT i 6-27-96 i 96-0695 2,900! 74 240 28 340 C EFFLUENT i 6-27-96 i 96-0696 101 0.19 0.1 0.05 0.12 C EFFLUENT ] 9-24-96 ! 96-3135 I UDI 0.2281 0.142 0.01] D REF = Report reference. N/A = Not applicable. ND = Not detected. A = Holguin, Fahan & Associates, Inc.'s (HFA's) report dated August 4, 1995. B = HFA's report dated April 18, 1996. C = HFA's report dated July 25, 1996. D = HFA's current report. 0 HOL©UIN,: FAFIAN & ~IATES, INC. ~; E~ylRONMENTAL-MANAGEMEN~ ~NSULTANTS ATTACHMENT 2. RBCA'TIER 1 WORKSHEETS AND DOSE/RESPONSE CALCULATIONS O~ Z.... 0 I-- Z .I- Z I--. Z 0 0 uJ HOLGUIN, FAHAN & ASSC~IATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS ATTACHMENT 3. RBCA TIER 2 FATE AND TRANSPORT MODELING WORKSHEETS AND DOSE/RESPONSE CALCULATIONS ,0E ,, ,-,. 000 © ~ W I.U W LIJ O' L~.. L~ I.L °~1 I- Z 13.1 Z 0 0 '+ + 1.1.11JJ '1 n-' o (.5 > HOLGUIN, FAHAN & ASS T , INC. ~ ENVIRONMENTAL MANAGEMENT CONSULTANTS 143 South Figueroa Street · Ventura, California 93001 (805) 652~0219 * FAX (805) 652-0793 853 West 17th Street · 3157 Pegasus Drive · October 14, 1996 Costa Mesa, California 92627 (714) 642-2660 *, FAX (714) 642-2544 Bakersfield, California 93308 (805) 391-0517 * FAX (805) 391-0826 I" OCT 1,51996 Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal In Care of Mr. Patrick C. Carrick Griffin · Cardck Attorneys at Law Post Office Box 2348 Bakersfield, California 93303-2348 By_ Subject: THIRD QUARTER 1996 REMEDIAL ACTION PROGRESS REPORT FOR CALIFORNIA SHEET METAL, 601 EUREKA STREET, BAKERSFIELD, CALIFORNIA Dear Mr. and Mrs. McCauley: Holguin, Fahan & Associates, Inc., (HFA) is pleased to present the following third quarter 1996 progress report of the ongoing remedial action being conducted at the California Sheet Metal property located at 601 Eureka Street in the city of Bakersfield, Kern County, California (see Figure 1 - Site Location Map). Remedial activities at the site have included the operation of a VES under San Joaquin Valley Unified Air Pollution Control District - Southern Region (SJVUAPCD-SR) PTO #S-2660-1-0. The remedial activities are being required by the City of Bakersfield Fire Department Hazardous Materials Division UST Local Oversight Program (BFDHMD UST LOP) as a result of the discovery of gasoline-containing soils surrounding the former gasoline UST at the site. The results of a remediation progress soil sampling at the site Is also included in this report. SITE BACKGROUND The site previously contained a single 550-gallon gasoline UST. California Sheet Metal contracted Calpi, Inc., to remove the UST on December 17, 1991. Gasoline hydrocarbon concentrations were detected in the soil samples (S-1 and S-2) collected from beneath the UST. On March 19, 1992, six soil borings (B-1 through B-6) were drilled at the site by Wilson & Associates, inc., and on March 8, 1993, three additional soil borings (B-7 through .B-9) were drilled at the site by Piwarea Engineering, Inc. The soils investigations indicated TPH as gasoline concentrations to depths less than 75 fbg and less than 45 feet laterally from the former UST location (see Attachment 1 for a summary of previous work). ENVIRONMENTAL PLANNERS * SCIENTISTS * GEOLOGISTS AND ENGINEERS Contaminated Site Assessments * Real Estate Audits * Site Remediation * Hazardous Waste Management HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page :2 On January 17 and 18, 1994, HFA drilled and installed six vapor extraction wells (VW-1 through VW-6). HFA connected the wells with 3-inch-diameter piping to a central manifold (see Figure2- Plot Plan Showing VES). On November 28, 1994, HFA acquired ATC Permit #S-2660-1-0 for a VES utilizing a King, Buck/Hasstech, inc., 150-scfm direct-fired thermal oxidizer for the in-situ vapor extraction of volatile hydrocarbons in the soils at the site. Subsequently, the system was delivered and installed at the site (see Figure 2 and Figure 3 - VES Schematic Diagram). On July 17, 1995, HFA conducted a source test of the treatment unit in compliance with the requirements of the ATC permit. Based on the vapor sampling and analytical results, the efficiency of the direct-fired, thermal oxidation system was greater than 99.8 percent, the maximum VOC emission was 1.4 ppmv, and the benzene emission was less than 0.03 ppmv. Therefore, the source test demonstrated compliance with the conditions of the ATC permit (see Table 1 Summary of Source Compliance Monitoring Analytical Results). HFA subsequently requested that the ATC permit be upgraded to a PTa. During the first 4 weeks of operation, high VOC concentrations and oxygen deficiency in the soil caused the unit to frequently shut down. During this time, vapor wells VW-1 and VW-2 were used as extraction wells while vapor wells VW-3 through VW-6 were used as air inlet wells, and the dilution air valve was completely open. As soil conditions improved, dilution air was slowly decreased until no dilution air was required, and well VW-3 was brought on line as an extraction well. HFA has operated the unit 24 hours per day since August 14, 1995, with only short periods of inactivity for maintenance, draining of the knockout pot, and a few occurrences when the system has shut down. On March 6 and June 27, 1996, HFA collected influent and effluent vapor samples, which were analyzed for TPH as gasoline and BTEX. The inlet vapor concentration was 1,900 ppmv during the March 6, 1996, sampling event, and 2,900 ppmv during the June 27, 1996, sampling event (see Table 1). VE$ REPORT FOR THE THIRD QUARTER OF 1996 On September 24, 1996, HFA collected influent and effluent vapor samples and submiffed them to HFA Environmental Laboratories, for analysis. The samples were analyzed for TPH as gasoline and BTEX using EPA Methods 8015 (M) and 8020, respectively, The inlet vapor concentration was 850 ppmv during the September 24, 1996, sampling event (see Table 1 and Attachment 2 for the laboratory report for vapor). During the third quarter of 1996, inlet vapor concentrations were reduced from a maximum concentration of 1,745 ppmv to a minimum concentration of 835 ppmv (see Figure 4 - Influent and Effluent TPH Concentrations and HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 3 Table 2 - Summary of VES Monitoring Data). The system shutdowns, which occurred frequently during the third quarter of 1996, appear to be related to the diminished volume of hydrocarbons remaining ir~' the subsurface, and the permeability of the soils that contain the'greatest concentrations of hydrocarbons. After a shutdown occurs, the VOCs recharge into the more permeable sediments. Initially, after the system is restarted, the concentrations of VOCs extracted are relatively high. However, the concentrations of VOCs extracted drops off rapidly until shutdown again occurs, This cycle was repeated frequently during the third quarter of 1996, The inlet soil vapor flow rate has been maintained near the maximum stated in the ATC permit and ranges from 60 to 120 scfm. HFA estimates the mass of gasoline hydrocarbons extracted from the subsurface since start-up to be approximately 13,370 pounds, which is equivalent to approximately 2,089 gallons of gasoline (see Figure 5 - Cumulative Extraction Curve and Table 2). However, with the diminished volume of hydrocarbons in the subsurface and the frequent system shutdowns, only 733 pounds of hydrocarbons was removed during the third quarter of 1996. Therefore, on September 4, 1996, HFA drilled three soil borings in and around the location of the former USTs to assess the progress of achieving the BFDHMD UST LOP cleanup levels at the site. REMEDIATION PROGRESS SOIL ASSESSMENT The objective of this phase of investigation was to assess the progress of the soil remediation activities at the subject site. HFA proposed to accomplish this through the drilling and sampling of three verification soil borings (B-10 through B-12) to a minimum depth of 70 fbg and analyzing soil samples for TPH as gasoline and BTEX (see Figure 2 for verification soil boring locations). SOILS INVESTIGATION AND SAMPLING RESULTS Prior to conducting the assessment, underground utilities such as water, electrical, and sewer were mapped by Underground Service Alert of Northern California. HFA performed the drilling and sampling of soil borings B-10 through B-12 on September 4, 1996, using a Mobile B-53 drill rig operated by Melton Drilling Company of Bakersfield, California (see Attachment 3 for the soil boring and sampling procedures). Soil boring B-10 was drilled to a depth of 91 fbg through the location of the former UST, and soil borings B-11 and B-12 were drilled to a depth of 51 flog at locations laterally from the former UST (see Figure 2 for soil boring locations). No groundwater was encountered in the soil borings. Undisturbed soil samples were collected at 5-foot intervals and selectively tested for TPH as gasoline and BTEX using EPA Methods 8015 (M) and 8020, respectively (see Table 3 - Summary of Soil Sample Analytical Results for Remediation HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 4 Progress Assessment, Attachment 3, Attachment 4 for the logs of exploratory borings, and Attachment 5 for the laboratory report for soil). The depth of soil boring B-10 was extended from the proposed depth of 70 fbg to a final depth of 91 fbg because VOC concentrations were indicated by the PID in all the samples collected to a depth of 80 fbg. Analysis of soil samples collected from soil boring B-10 indicated detectable TPH as gasoline and BTEX concentrations in the interval ranging in depth from 15 fbg to 65 fbg, with benzene concentrations detected at a maximum concentration of 34 mg/kg in the soil sample collected from a depth of 65 fbg (see Table 3 and Attachment 5). Analysis of soil samples collected from soil boring B-11 indicated a detectable TPH as gasoline concentration in only the soil sample collected from a depth of 30 fbg, and in soil boring B-12 at a depth of 25 fbg (see Table 3 and Attachment 5). CONCLUSIONS AND RECOMMENDATIONS Approximately 2,089 gallons of gasoline has been extracted at the site since VES start-up. With the diminished volume of hydrocarbons in the subsurface, frequent system shutdowns are occurring, and only 733 pounds of hydrocarbons were removed during the third quarter of 1996. Therefore, HFA drilled three verification soil borings in and around the location of the former USTs on September 4, 1996, to assess the progress of achieving the BFDHMD UST LOP cleanup levels at the site. One result of the progress soils assessment is that a significant reduction in the concentration of gasoline hydrocarbons from the original maximum TPH as gasoline and benzene concentrations of 30,000 mg/kg and 1,000 mg/kg, respectively, has been achieged, Another result is that the lateral areas of the original vadose zone plume indicate only residual concentrations in the soil compared to the original maximum lateral TPH as gasoline and benzene concentrations of 7,000 mg/kg and 42 mg/kg, respectively. However, significant concentrations of gasoline hydrocarbons remain in the central area of the vadose zone plume, with a maximum TPH as gasoline concentration of 5,900 mg/kg and a maximum benzene concentration of 34 mg/kg. Given the results of the remediation progress soils assessment, and in accordance with the Lawrence Livermore National Laboratory's Recommendations to Improve the Cleanup Process for California's Leaking Underground Fuel Tanks report dated October 16, 1995, and the State Water Resources Control Board's Underground Storage Tank Cleanup Fund Technical Review Guidance Document No. 4 dated December 27, 1995, Mr. John M. and Mrs. Deanna J. McCauley request that the BFDHMD UST LOP provide written guidance pertaining to the additional remediation activities required at the site. HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIF~tONMENT.~xL M~NA~-~EMENT OONSULTANT~ Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 5 ACTIVITIES PLANNED FOR THE FOURTH QUARTER OF 1996 During the fourth quarter of 1996, HFA will continue full-time operation of the VES unit, pending site status review by the BFDHMD UST LOP. Holguin, Fahan & Associates, Inc., trusts that you will find this third quarter 1996 remedial action progress report to your satisfaction. If you have any questions or require additional information, please contact Mr. Mark Magargee at (805) 391-0517 or at e-mail address Mark_Magargee@hfa.com. Respectfully submitted, Kenneth J. Mitchell, REA ~ ~-- Associate Geologist Holguin, Fahan & Associates, Inc. Senior Hydrogeologist Holguin, Fahan & Associates, Inc. MRM:rri Enclosures: Figure 1 - Figure 2 - Figure 3 - Figure 4 - Figure 5 - Table 1 - Table 2 - Table 3 Attachment 1 Attachment 2 Attachment 3 Attachment 4 Attachment 5 Site Location Map Plot Plan Showing VES VES Schematic Diagram Influent and Effluent TPH Concentrations Cumulative Extraction Curve Summary of Source Compliance Monitoring Analytical Re'SUits,. Summary of VES Monitoring Data Summary of Soil Sample Analytical Results for Remediation Progress Assessment Summary of Previous Work Laboratory Report for Vapor Soil Boring and Sampling Procedures Logs of Exploratory Borings Laboratory Report for Soil CC: Mr. Howard H. Wines, III, BFDHMD UST LOP Mr. Patrick C. Carrick, Griffin · Carrick HOLGUIN, FAHAN & A.SSC~IATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 6 IIIII o I o LEGEND O 0.5 1 MILE 0 1,000 2,000 3,000 4,000 5,000 FEET 0 0.5 ! K~OMETER USGS ~SFON~MONT~II CENT~ILDALE 7.5 MINUTE SERIES 388 4 MR. JOHN M. AND MRS. DEANNA J. McCAULEY CALIFORNIA SHEET METAL 601 EUREKA STREET BAKERSFIELD, CALIFORNIA FIGURE 1 - SITE LOCATION MAP HOLGUIN, FAHAN & ASSOCIATES, INC. HOLGUIN, FAHAN & ASSOCIATe, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr, John M, and Mrs. Deanna J, McCauley California Sheet Metal October 14, 1996- Page 7 EUREKA STREET SIDEWALK -'-- CHAIN-LINK FENCE ~,~ uJ (/) CALIFORNIA Z SHEET METAL n- BUILDING ""' CONCRETE SLAB ' LIMIT OF CANOPY ' GASOLINE-CONTAINING ~-?~.~ ' SOILS , U.I o3 !\ VVV-2 (~ V-W'-3. i\ '~' ~, '~ ~ ......... \ "'(~ ,-- ........... 'i___% .............. ~q L ~N KLFI ~AOv~TIONi ~ LIMIT OF '~ ' ~- MANIFOLD ~ CHAIN-LINK FENCE SCALE IN FEET I ALLEY 0 10 2O LEGEND MR. JOHN M. AND MRS. DEANNA J. McCAULEY CALIFORNIA SHEET METAL ~ VAPOR EXTRACTION WELL 601 EUREKA STREET ""~. VES PiPiNG BAKERSFIELD, CALIFORNIA '"' FIGURE 2 - PLOT PLAN SHOWING VES ,~, VERIFICATION SOIL BORING HOLGUIN, FAHAN & ASSOCIATES, INC. REVISION DATE: OCTOBER 11, 1996: RRI HOLGUIN, FAHAN & ASS(~IATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 8 VW-1 VW-2 VW-3 VW-4 VW-5 VW-6 -X ATMOSPHERE KNOCK-OUT DRUM INFLUENT MONITORING POINT <150 scfm J-' I BLOWER WITH SILENCER SUPPLEMENTAL FUEL EFFLUENT MONITORING POINT THERMAL/ CATALYTIC OXIDIZER LEGEND X PRESSURE OR VACUUM GAUGE .,~ VALVE I o I FLOW GAUGE ~ SAMPLE TAP REVISION DATE: FEBRUARY'8, 1996: RRI NOT TO SCALE , MR. JOHN M. AND MRS. DEANNA J. McCAULEY CALIFORNIA SHEET METAL 601 EUREKA STREET BAKERSFIELD, CALIFORNIA FIGURE 3 - VES SCHEMATIC DIAGRAM HOLGUIN, FAHAN & ASSOCIATES, INC. HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 9 FIGURE 4 - INFLUENT AND EFFLUENT TPH CONCENTRATIONS O o 100 10 o.1 ' TPH J t ........... TPH Out 0 5 10 15 20 25 30 35 Cumulative Operating Weeks HOLGUIN, FAHAN & ASS(X21ATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 ~ Page 10 FIGURE 5 - CUMULATIVE EXTRACTION CURVE 15,000- 10,000 5,000 0 5 10 15 20 Cumulative Operating Weeks 25 30 35 HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 11 TABLE 1. SUMMARY OF SOURCE COMPLIANCE MONITORING ANALYTICAL RESULTS CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA ] DATE I TPH AS i ETHYL- ! TOTAL SAMPLE SOURCE SAMPLED ]SAMPLE I.D. GASOLINEi BENZENE TOLUENE BENZENEI XYLENES REF ,I t (ppmv) (ppmv) i (ppmv) (ppmv) j (ppmv) EPA ANALYTICAL METHOD ! 8015 (M) i 8020 i N/A METHOD DETECTION LIMIT I VARIES-SEE LABORATORY REPORTS ! N/A INFLUENT !7-17-95 95-8623-2 702i 33.94 83.19 5.501 42.92i A EFFLUENT 17-17-95 95-8623-1 1.41 ND 0.08 NDI 0.14 A INFLUENT i 3'6-96 96-0695 1,900! 92 210 32! 190 B EFFLUENT I 3-6-96 96-0696 ! NDI 0.561 0.291 0.07! 0.151 B INFLUENT i 6-27-96 t 96-0695 I 2,900i 74i 240t 28! 340i C EFFLUENT ! 6-27-96 96-0696 J 10i 0.191 0.1! 0.051 0.121 C INFLUENT i 9-24-96 , 96-3134 8501 361 72! 12! 89i D EFFLUENT i 9-24-96I 96-3135 I UDi 0.228i 0.1421 0.01! 0.0491 D REF = Report reference. N/A = Not applicable. ND = Not detected. A = Holguin, Fahan & Associates, Inc.'s (HFA's) report dated August 4, 1995. B = HFA's report dated April 18, 1996. C = HFA's report dated July 25, 1996. D = HFA's current report. HOLGUIN, FAHAN & ASSC~IATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October t4, 1996 - Page 12 <~ >~, o,_ O q ~'~0 aO O aO ~ DO O ~0 O ~0 ~ ~ · · , · · e · I · · , e ele · · · · , · e · e · · · · e ~e · e~e · e · · · · · e · e e e e e e e e e e o ~o o ~o o D o · · ee'e · ~ ~o o D o DO o D o ~ o ~ , > ~e · · · · e · · i · e i e e e e e e e i e e e e e eei e e e · e ele · e · e,e · · · · · · · e · e,e · ~ > ~ee eee· · · · · e e e e eee ee eee ee eoo ~oo boo ~o ee · DO~OO DO boo DO~OO ~, · ele · · · · · · · · · · · e e ao ~oo ao apo ~oo ~oo ~o ~ o ee ele e · e:e~e e · e e e e ~ DO0 DODO0 DO~ ~OD O DO,aa DOO ~eeo~ aaa ~O DO ooooo ~OD 0 DO~ DO , I ~o ~o HOLGUIN, FAHAN & ~IATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M, and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 13 o~ N d ;,~ ~ ~ d ........ d 0 ~ ~ d ~ d d ~ ~ ;'; ; ~ ....... ...... ~w i I ~ ?o I ~ ~0 0 I · · DO 3 O3~e lO0 DoDoeee DODOO De*eD o>o~eeleoDo0~oe,ee -~ ~ I I ~ ~ootee leo DOD DOD O 3eteeeo DO3OO DODOe le Je DOD Do3Oo Doee · ~io_ o!~oo ~oo ~oo ~.... .o~oo ~o ~o o?....i, o ~o~o o~o ~o .i.... o ~o ~~I~ I 8,~~18~8~o~1~ooo~,8~8~ooo~o~o ~: ~§ g~8~g~8~ig~8~8:~8~1 ....... ~1 ..... ~~ oooo: , I ~, I.,~~,~1~o~!~~_ ,~!~=~,~~,~o ~ .... 0 & ASSOC~T~, [NC. ENVIRONMENTAL MANAGEMENT CONSULTANTS Mr. John M. and Mrs. Deanna J. McCauley California Sheet Metal October 14, 1996 - Page 14 TABLE 3. SUMMARY OF SOIL SAMPLE ANALYTICAL RESULTS FOR REMEDIATION PROGRESS ASSESSMENT CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA SAMPLE DATEt SAMPLE TPH AS ETHYL- TOTAL SOURCE SAMPLED DEPTH I.D. GASOLINE BENZENE TOLUENE I BENZENE XYLENES REF i I (fbg) t } (mg/kg) (mg/kg) (mg/kg) (mg/kg) (rog/kg) EPA ANALYTICAL METHOD I 8015 (M) 8020 N/A METHOD REPORTING LIMIT ! 10 0.005 0.005 0.015 0.015t N/A B-10 i 9-4-96 i 15 i. B'10-15 i 2,400 ND[ 200 25 300 A t ~:~/ 25 I B-10-25. 4,200 NDI~29~_D~ 48 160 A ~--9-4-96 ~ 3~----]-B-10-35 __ 2,800 14 39 49 74 ! 9-4-96 ! 45 i B-10-45 { 190 0.24. 0.53 8.3 A i..._?:.4.-9__6__i 55 i'--~-~-0~--5-~-~- 5,900 8.1} 50 97) 160 ]-----9---4-L-9-~ -J ...... -6-5----!---BZ-10-65 L 2,600 34} 140 340 320 A {.__9-~4-_9._6___1 75 B-10-75~ NO NDi 0.024 ND 0.037 A i 9-4-96 I 85 ..... E~-~)-~ l-- ND 0.72 0.77 0.061 0.34 A-- I'-~--4-~6 ] 90 i B-10-90 ]-- ND 0.36 0.52 0.039 0.2 A- l 9-4-96 ) 15 B-11-15 ND ____ND ND ND A NO NO ^ ~--4'--~ ~ 50 I B-11-50 ND UDi ---ND ND ND A i 9-4-96 I 25 B-12-25 1,400 0.0054 3.4 35 A 9-4-96! 40 B-12-40 ND 0.0083 0.065 0.047 0.47 A 9-4-96 I 50 B-12-50 ND ND NDi ND ND A REF = Report reference. N/A = Not applicable. ND = Not detected. A = Holguin, Fahan & Associates, Inc.'s, current report. HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS ATTACHMENT 1. SUMMARY OF PREVIOUS WORK I~URFK^ STREET SIDEWALK T ---- CHAIN-LINK FENCE I.lJ LLI 03 CALIFORNIA Z SHEET METAL rr BUILDING ~' CONCRETE SLAB ~ CANO¢¥ , ~ , ~) B-0 B-8 B-~ iOz B-5 ~ _z B-1 ~ ~ B-2 ' ~ LIMIT OF \ ' TANK EXCAVATION B-4 ~ CHAIN-LINK FENCE SCALE IN FEET ALLEY 0 ~. 10 20 LEGEND MR. JOHN M. AND MRS. DEANNA J. McCAULEY '~' SOIL BORING CALIFORNIA SHEET METAL 601 EUREKA STREET BAKERSFIELD, CALIFORNIA FIGURE 1 - PLOT PLAN HOLGUIN, FAHAN & ASSOCIATES, INC. REVISION DATE: OCTOBER 11, 1996: RRI TABLE 1. SUMMARY OF SOIL SAMPLE ANALYTICAL RESULTS FOR TANK REMOVAL CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA SOURCE S DEPTH I.D. GASOLINE BENZENEITOLUENE BENZENE XYLENESIREF t (fbg) (mg/kg) (mg/kg) ! (mg/kg) (mg/kg) I (mg/kg) I EPA ANALYTICAL METHOD 8015 (M) 1 8020 i N/A MINIMUM REPORTING LEVEL t 1.0 0.0051 0.005! 0.0051 0.0051 N/A S-2 It 12-17-91 12 i S-2-1~-2 10,000 98i ----- 275 2~)0! ~- REF = Report reference. N/A = Not applicable. A = Calpi, Inc.'s, report dated September 1992. TABLE 2. SUMMARY OF SOIL SAMPLE ANALYTICAL RESULTS CALIFORNIA SHEET METAL, BAKERSFIELD, CALIFORNIA DATE! i SAMPLE TPH AS ETHYL- TOTAL TOTAL t ORGANIC SAMPLE SOURCE SAMPLED DEPTH ' I.D. GASOLINE BENZENE TOLUENE BENZENE XYLENES LEAD LEAD :REF , (fbg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EPA ANALYTICAL METHOD 8015 (M) 8020 t 7420 N/A METHOD REPORTING LIMIT VARIES-SEE LABORATORY REPORTS I N/Al B-1 . 3-19-92 I 5 i B-1-5 I 6,000 ND(>20) 210 50 1,960 39 2.7! A Ii3-19-92 ' 30 i B-~1-30 -- 3,100 -ND (>2.0) 86 71 438t 4.5 -- A 3-19-92 i 45 I B-1-45 ,- 3,000 5.0 160 75 39~! -- A -- ~ND 3-19-92 I 60 ! B-1-60 13,000 110 1,300 300 2,560_ -- A 3-19-92 ! 75 i B-1-75 ND ND ND ND N~D -- A 3-19-92! 80L__.B_-_I_" -80_~ ND ND ND ND ND . -- A 3-19-92i 85 ! B-1-85 ND ND 0.047 ND 0.014 4.5 -- A 3-19-921 90 I -B-- 1-90 ND 0.084 0.16 0.049 0.088 .... A B-2 . 3-19-92 I 15 ! B-2-15 12,0001 1,000 1,500 340 2,480 .... A 3-19-92 I 30 ! B-2-30 4001 0.2 1.2 4.7 49 3.9 -- A B-3 3-19-92 i 30 ~ B-3-30 30,0001 . 400 3,400 800 4,300 .... A B-4 3-19-92 ! 30 j B-4-30 ND ND ND ND ND .... A 3-19-92 'i 40 I B-4-40 --ND, ND ND ND ND .... A B'5 3-19-92 .I. 15 .i B-5-15 t ND 0.011 0.017 ND ND .... A 3-19-92 I 40 I B-5-40 t 7,000 42 540 160 810 .... A B-6 3-19-92 .!. 20 .. B-6-20 L_ ND _ ND ND ND ND 3.6 -- A 3-19-92~ 30 ! B-6-30 1.--ND_ ND ND ND NO .... A 3-19-92 { 40 i B-6-40 I ND ND 0,008 ND 0.01 8.5 -- A I B-7-20I ND ND ND ND ND ..... B B-7 3-8-93 ! 20 3-8-93 I 30 i B-7-30 t ND ND ND ND ND _-- -- B 3-8-93 I 50 '~ B-7-50t NDi 0.064! 0.029 ND 0.015 .... B B-8 i 3-8-93 i 20 } B-8-20. , ND ND ND ND N__D "t " " 3-8-93 I 35 B-8-35 ND 0.079 0.11 ND 0.09 .... B 3-8-93 t 40 B-9-40 ND ND ND__ ND' ND .... B 3-8-93 50 i B-9-50 0.11 0.027 ND 0.045 .... B REF = Re ~ort reference. N/A -- Not applicable. ND = Not detected. -- = Not anal ,zed. A = Wilson & Associates, Inc.'s, report dated September 1992. B = Piwarea Engineering, Inc.'s, report dated April 1993. HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS ATTACHMENT 2. LABORATORY REPORT FOR VAPOR HOLGUIN, FAHAN & ASSOCIATES, ENVIFIONMENTAL LABOFIATOFllES INC. October 2, 1996 143 South Figueroa Street ·Ventura, California 93001 · (805) 652-0219 · FAX: (805) 652-0793 REPORT OF ANALYTICAL RESULTS CLIENT: John & Deanna McCauley John & Deanna McCauley Post Office Box 2348 Bakersfield CA 93303-2348 PROJECT: California Sheet Metal Page 1 Analyzed By: v. de Vera Sampled By: T. Martin Units: p~ v/v Matrix: Air Analyses Method: BTEX: EPA 8020 TPH: 8015-M CONCENTRATIOH OF TOTAL PETROLEUM HYDROCARBONS (TPH) WITH BTEX DISTINCTION CONSTITUENT TP~- TPH- Ethyl Total Percent Lab Sample Dates Sampled, Gas Diesel Benzene Toluene Benzene Xylenes MTBE Surrogate No. No. Received and Tested MRL MRL 1,1RL MRL ;4RL MRL MRL Recovery 963134 Influent 9/24/96 9/24/96 9/25/96 850 36 72 12 89 i06% 10 .01 .01 .01 .04 963135 Effluent 9/24/96 9/24/96 1/11/96 ND <MRL .228 .142 .01 .049 89% 10 .01 .01 .01 .04 FJiL = Method Reporting Limit ND = Not Detected at or above F~i,L Lab Certification: CAELAP #]878; 1/31/96 HOLGUIN, FAHAN & ASSOCIATES, INCo ENVIRONMENTAL LABORATORIES 2550 Eadman Ave., Uni! 1, Ventura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 METHOD BLANK REPORT REPOR'[ OF ANALYIICAL RESULTS Report Date: 27-Sep-96 Dole Analyzed: QC Botch ID: Iv~BA 9/25/96 Analyzed By: Instrument ID: HP 5890 GC-1 Analysis lvlethod: 25-Sep-96 V. de Vera 8015-m/8020 lab No. CONCEN'I'RATION OF TOTAL PEI'ROLEUM HYDROCARBONS (TPH) WITH BTEX DISTINCTION in ppm v/v (air) TPH- Elhyl Tolal Clieni Gasoline Benzene Toluene Benzene Xylenes Sample No. Moffix M£/. M,?Z /v/,~/. M£/ /vl,~l MBA 9/25/96 Melhod Blank Air ND ND ND ND ND 10 0.01 0.01 0.01 0.04 Vola,lile ,fuel hydrocarbons are quan,lilaled agains! a gasoline slandald. Hydrocarbons detecled by ihis me,lhod range flomC6'loCI5. Analy'lesleporledasNDwelenol p:esen! above thesla.ledlimilofdelec'lion. I,ARL = Melhod Repot!lng Limit I'JD = Nol Delecled at or above I,ARL LAB CER'iIF1CAIlON: CAELAP # 1878; 1/31/96 HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL LABORATORIES 2550 Eastman Ave., Unii 1, Veniura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 Sample ID: Blank Spike Date Analyzed: 25-Sep-96 Lab No: Blank Spike Matrix: Water Instrument ID: HP 5890 GC-1 Dilution Factor: 1 Matrix Spike Worksheet EPA 8020 Matrix Spike Results Compound Sample Matrix Spike Spike Sol. Recovery Control Conc.(ppb) Conc.(ppb) Conc.(ppb) (%) Limits MTBE 0.00 25 20 126 20-165 Benzene 0.00 22 20 108 48-155 T~luene 0.00 22 20 111 59-144 Ethylbenzene 0.00 20 20 102 58-139 m,p-Xylenes 0.00 22 20 108 58-143 o-Xylene 0.00 21 20 105 58-147 Matrix Spike Duplicate Results Compound Sample Matrix Spk. Dup Spike Sol. Recovery Control Conc.(ppb) Conc.(ppb) Conc.(ppb) (%) Limits /~ITBE 0.00 20 0 20-165 Benzene 0.00 20 0 48-155 Tbluene 0.00 20 0 59-144 Ethylbenzene 0.00 20 0 58-139 m,p-Xylenes 0.00 20 0 58-143 o-Xylene 0.00 20 0 58-147 Average Recovery & RPD Data ~,ompound Spike Matrix ~pk. Dup Average %RPD Control Recovery Recovery Recovery Limits MTBE 126 0 63 200.0 <21 Benzene 108 0 54 200.0 < 14 Toluene 111 0 55 200.0 <14 Ethylbenzene 102 0 51 200.0 < 13 m,p-Xytenes 108 0 54 200.0 < 12 o-Xylene 105 0 53 200.0 <15 9 o HOLGUIN, FAHAN & ~IATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS ATTACHMENT 3. SOIL BORING AND SAMPLING PROCEDURES SOIL BORING AND SAMPLING PROCEDURES HAND-AUGERING PROCEDURES Each soil boring is manually drilled utilizing an 2-inch-OD hand auger manufactured by Xitech industries. Soil samples are collected with a drive sampler, which is outfitted with 1.5-inch by 3-inch stainless steel or brass sleeves. When the sample is withdrawn, the ends of the sleeve are covered with aluminum foil or TeflonTM tape followed by plastic caps. During the drilling process, soil cuttings are field screened for V©Cs using a PID calibrated to 100 ppmv isobutylene. Any soil staining or discoloration is visually identified. All data is recorded on logs of exploratory borings under the supervision of a state of California registered geologist. Soils are classified according to the Unified Soil Classification System (USCS). Specific geologic and hydrogeologic information collected includes depth to groundwater, plasticity, density, stiffness, mineral composition, moisture content, soil type, structure, grain size, and other features that could affect contaminant transport. The samples are labeled, sealed, recorded on a chain-of-custody record, and chilled in accordance with the procedures outlined in the State Water Resources Control Board's (SWRCB's) LUFT field manual. Sample preservation, handling, and transportation procedures are consistent with Holguin, Fahan & Associates, Inc.'s (HFA's) QA/QC procedures. The samples are transported in a chilled container to a California state-certified hazardous waste testing laboratory. TRUCK-MOUNTED DRILLING AND SOIL SAMPLING PROCEDURES Underground Service Alert of Northern California is notified at least 48 hours before drilling activities commence. Each soil boring is manually drilled for the first 4 feet to establish that the area is clear of subsurface structures. The soil borings are drilled with either a hollow-stem auger or an air rotary bit, and soil samples are collected with a California modified split-spoon sampler. The sampler is outfitted with 2.5-inch by 6-inch stainless steel or brass sleeves. When the sample is withdrawn, the ends of the sleeve are covered with aluminum foil or TeflonTM tape followed by plastic caps. During the drilling process, soil cuttings are field screened for VOCs using a PID calibrated to 100 ppmv isobutylene. Any soil staining or discoloration is visually identified. All data is recorded on logs of exploratory borings under the supervision of a state of California registered geologist. Soils are classified according to the USCS. Specific geologic and hydrogeologic information collected includes depth to groundwater, plasticity, density, stiffness, mineral composition, moisture content, soil type, structure, grain size, and other features that could affect contaminant transport. The samples are labeled, sealed, recorded on a chain-of-custody record, and chilled in accordance with the procedures outlined in the SWRCB*s LUFT field manual. Sample preservation, handling, and transportation procedures are consistent with HFA's QA/QC procedures. The samples are transported in a chilled container to a California state-certified, hazardous waste testing laboratory. Soil Boring and Sampling Procedures Page 2 DECONTAMINATION PROCEDURES Before each sampling episode, the sampling equipment is decontaminated using a non-phosphate soap and water wash, a tap water rinse, and two deionized water rinses. The drill string is decontaminated with a steam cleaner between each soil boring. WASTE MANAGEMENT AND DISPOSAL The cuttings from the soil borings are stored at the site of generation in a covered stockpile until sample analytical results are obtained, at which time the soil is disposed of appropriately. SOIL BORING ABANDONMENT PROCEDURES Each soil boring will be backfiiled with bentonite grout, neat cement, concrete, or bentonite chips with a permeability less than that of the surrounding soils. The grout is placed by the tremie method. DATA REDUCTION The data compiled from the soil borings is summarized and analyzed. A narrative summary of the soil characteristics is also presented. The logs of exploratory borings are checked for the following information: · correlation of s;rratigraphic units among borings; · identification of zones of potentially high hydraulic conductivity; · identification of the confining formation/layer; · indication of unusual/unpredicted geologic features (fault zones, fracture traces, facies changes, solution channels, buried stream deposits, cross-cutting structures, pinchout zones, etc.); and · continuity of petrographic features such as sorting, grain-size distribution, cementation, etc. Soil boring locations are plotted on a properly scaled map. If appropriate, soil stratigraphy of the site is presented in a scaled cross section. Specific features that may impact contaminant migration (e.g., fault zones or impermeable layers) are discussed in narrative form and supplemented with graphical presentations as deemed appropriate. HOLGUIN, FAHAN & ~IATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS ATTACHMENT 4. LOGS OF EXPLORATORY BORINGS SAMPLE CLIENT: Mr. John M. and Mrs. Deanna J. McCauley C_OMPLETION DETAIL GROUNDWATER WELL ~ o3 -- VADOSE WELL - PROJECT: California Sheet Metal ~_'" --~ o3 -- ~ ~-~ o3~ _~ E O __ SPARGEWELL ~ a_~ LOCATION: 601 Eureka Street, Bakersfield, California ~z a_ ~ o3 x BORING ~ "-" DESCRIPTION AND SOIL CLASSIFICATION CASING: N/A -- NAME: %gravel/sand/fines, gradation/plasticity, color, angularity, SLOT SIZE: ~N/A~ maximum size (gravels), density/consistency, moisture, odor, slain FILTER PACK: Nlra. -- 0 __ SILTY SAND: 0/80/20, with minor clay. brown, SM subangular, loose, soft. moist, strong hydrocarbon ' odor. no stain ,,, -,, -- __ 2,3,3 >2,000 -- 5 · 10 0/85/15 2.4.5 >2.000 ....... ·- 15 10,10.5 >2.000 __ ,,.,,,,,..,.., m 15 ,,-,-,-,-,,,, · -- 20 20 __ SAND: 0/90/10, tan, subangular, loose, soft, moist, 2,5,10 >2,000 SW __ very strong hydrocarbon odor, no stain ,', ,', ,', ,', ,', ,', ; ~ · ~-- 25 ,,,,,,,,,,,,: 25 ~ SILT: 0/5/95, brown, loose, soft, moist, very strong 3,5.12 >2,000 ML ~ hydrocarbon odor, no stain · ~ 30 ' ',',',',',',, ~ 30 __ SAND: 0/90/10, brown, subangular, loose, soft. moist, 3,5.6 >2,000 SW ,,,,,,,,,,,,, very strong hydrocarbon odor, no stain ,, ,, ,, ,, ,, ~, , -, ~ ,,,,,,,,,,,,, ~ 35 ~-~-~-~' ~ 35 DRILLING METHOD: Mobile B-531 8"-OD hollow-stem au.qer DATE DRILLED: September 4, 1996 8AMPLER TYPE: 2"-diameter California modified split spoon LOGGED BY: K. Mitchell. REA TOTAL BORING DEPTH: 91 fb§ APPROVED BY: M. Mac,]arc~ee. FIG #4892 DEPTH TO WATER: Not encountered DRILLED BY: Melton Drilling Company -~. _~ I'IOLG'UIN, ' ~ ~~ & LOG OF EXPLORATORY BORING B-10 ~ 2t-SSOC]-,Z~.l'~--,S, ]']~'C. Page 1 of 3 COMPLETION DETAIL SAMPLE CLIENT: Mr. John M. and Mrs. Deanna J. McCaule¥ -- GROUNDWATER WELL rr __ uJ 03 VADOSE WELL >~ PROJECT: California Sheet Metal a_ ILl ~ 03 SPARGE WELL 'T' ~ LOCATION: 601 Eureka Street, Bakersfield, California °-z o. ~ 03 x ' BORING .u: [u ~ ~ ~ CASING: N/A ~. /2 DESCRIPTION AND SOIL CLASSIFICATION 03 SLOT SIZE: N/A NAME: %gravel/sand/fines, gradation/plasticity, color, angularity, FILTER PACK: N/A maximum size (gravels), density/consistency, moisture, odor, stain ,,,,,,,,,,,,,~,,~ 35 · -- 35 SILT: 0/10/90, with sand, brown, subangular, loose, 5,8,10 >2,000 ML/SM stiff, moist, strong hydrocarbon odor, no stain · L_ 40 ,,,,,,,,,,,, < ~ 40 SAND: 0/90/10, well graded, brown, subangular, 10,16,18 >2,000 SW loose, soft, dry, very strong hydrocarbon odor, no stain ·- 45 2,4,5 >2,000 ,,' ,,' ,,' ,,' ,,' ,~ , -- 45 · ~ 50 light tan to white 8,14,16 230 ,, ,, ,, ,, ,, ,, , ~ 50 · 55 SILT: 0/15/85, with sand, brown, Iow plasticity, loose, 4,6,8 >2,000 ML qqqqqq, _ soft, moist, very strong fresh hydrocarbon odor, no stain ,~ ,~ ,, ,, ,, ,, ~ 60 · 60 0/10/90 15,22,30 >2,000 -- ',',',',',',' -- 65 · 65 0/0/100, with clay, dark brown, moderate to high 4,8,14 >2,000 -- plasticity ",',',',',',' -- -- 70 ,,,,,,.,,,,, 70 DRILLING METHOD: Mobile B-53, 8"-OD hollow-stem au.qer DATE DRILLED: September 4, 1996 SAMPLER TYPE: 2"-diameter California modified split spoon LOGGED BY: K. Mitchell, REA TOTAL BORING DEPTH: 91 fb.q APPROVED BY: M. Magargee, RG #4892 DEPTH TO WATER: Not encountered DRILLED BY: Melton Drilling Company B-10 & LOG OF EXPLORATORY BORING ~; ASSOCIATES, INC. Page 2 of 3 COMPLETION DETAIL SAMPLE CLIENT: Mr. John M. and Mrs. Deanna J. McCauley -- GROUNDWATER WELL LO ~ VADOSE WELL -- PROJECT: California Sheet Metal Q- LO ~ __ -- (.) __ SPARGE WELL t-- '~ ~. c~ co x BORING a_,~ LOCATION: 601 Eureka Street, Bakersfield, California ~z ,~ ~ -- uJ ~ S ~ ~ CASING: N/A u~ ~ DESCRIPTION AND SOIL CLASSIFICATION ~ SLOT SIZE:__ N/A NAME: %gravel/sand/fines, gradation/plasticity, color, angularity, FILTER PACK: N/A maximum size (gravels), density/consistency, moisture, odor, stain · -- 70 CLAYEY SILT: 0/0/100, moderate to high plasticity, 8,14,16 310 ML/CL dark brown, dense, soft, moderate hydrocarbon odor, no stain · - SAND: 0/90/10, well graded, brown, subangular, 12,20,24 >2,000 SW loose, stiff, strong hydrocarbon odor, no stain m VERY SANDY GRAVEL: 10/85/5, tan, subangular, 5,22,26 90 GM/SM >1.5", dense, stiff, no odor, no stain q',',',',q' _ __ CLAY: 0/2/98, high plasticity, brown, dense, stiff, dry, 8,22,30 0 CL ,,,,-,,,-,,,, _ · -- 90 SILTY SAND: 0/60/40, with clay, brown, dense, stiff, SM ,,,,-,-,-,,,:-- 90 -- 95 -- 95 -- 105 -- 105 DRILLING METHOD: Mobile B-53, 8"-OD hollow-stem au.qer DATE DRILLED: September 4, 1996 SAMPLER TYPE: 2"-diameter California modified split spoon LOGGED BY: K. Mitchell, REA TOTAL BORING DEPTH: 91 fbg APPROVED BY: M. Magargee, RG #4892 DEPTH TO WATER: Not encountered DRILLED BY: Melton Drilling Company FAHA & LOG OF EXPLORATORY BORING ~ ASSOCL~TES, INC. Page 3 of 3 SAMPLE CLIENT: Mr. John M. and Mrs. Deanna J. McCauley C~OMPLETION DETAIL GROUNDWATER WELL rr __ uJ u~ VADOSE WELL .u PROJECT: California Sheet Metal o.,,, ~- (~ -- ~ ~ ~ ~ ~ 9 E O __ SPARGE WELL ~ m~ LOCATION: 601 Eureka Street, Bakersfield, California ~ ~ ~ ~x BORING ~ ~ DESCRIPTION AND SOIL CLASSIFICATION ~ ® CASING: N/A -- NAME: %gravel/sand/fines, gradation/plasticity, color, angularity, SLOT SIZE: N/A maximum size (gravels), density/consistency, moislure, odor. stain FILTER PACK: N/A -- o <~,~,-- o _ SILTY SAND: 0/85/15, brown, dense, soft, moist, no SM qqqqqq, _ odor, no stain ~ 5 2,2,4 0 %%%%%%'~ 5 ~ 10 2,3,6 0 ~ 10 %~%~%, -- 15 _ SILT: 0/30~0, with fine sand, Iow plasticity, brown, 3,5,8 0 M~SM ~~, ~ loose, soft, moist, no odor, no stain ~~, _ ~-- 20 ~~'~ 20 ~ SAND: 0/80/20, well graded, brown to gray, loose, 5,10,10 0 SW/SM ~ soft, moist, no odor, no stain ;,;,;,;,;;,; - ~ 25 C~YEY SILT: 0/0/100, moderate plasticity, brown, 3,4,7 >2,000 MUCL loose, soft, moist, strong hydrocarbon odor, no stain ~ SILTY SAND: 0/80/20, brown, loose, stiff, moist, 5,12,14 >2,000 SM _ strong hydrocarbon odor, no stain -- 35 ~%~%~%'~ 35 DRILLING METHOD: Mobile B-53, 8"-OD hollow-stem auger DATE DRILLED: September 4, 1996 SAMPLER TYPE: 2"-diameter California modified split spoon LOGGED BY: K. Mitchell, REA TOTAL BORING DEPTH: 51 fbg APPROVED BY: M. Magargee, RG ~4892 DEPTH TO WATER: Not encountered DRILLED BY: Melton Drilling Company & LOG OF EXPLORATORY BORING B-1 1 ~ ASSOC~S, [~C. Page 1 of 2 COMPLETION DETAIL SAMPLE CLIENT: Mr. John M. and Mrs. Deanna J. McCauley -- GROUNDWATER WELL ~03 -- VADOSE WELL ~ PROJECT: California Sheet Metal o.,,, ~ 03 -- 03,5 °- ~> o _SPARGE WELL ~ ,,,-__.mnLOCATION: 601 Eureka Street, Bakersfield, California o, 7~Z Q-v ~ 032) --x BORING , CASING: N/A ~ i ~ DESCRIPTION AND SOIL CLASSIFICATION o3 SLOT SIZE: N/A NAME: %gravel/sand/fines, gradation/plasticity, color, angularity, FILTER PACK: N/A maximum size (gravels), density/consistency, moisture, odor, stain .,,,,,,,,.,, :-- 35 · -- 35 CLAYEY SILT: 0/0/100, moderate plasticity, brown, 5,6,14 1,468 ML/CL -- loose, soft, strong hydrocarbon odor, no stain ~ ~',,.', ~ ~ ~,,< ~ 40 · 40 SILTY SAND: 0/90/10, brown, dense, soft, moist, 5,6,14 >2,000 SM strong hydrocarbon odor, no stain 45 45 SAND: 0/85/15, well graded, tan, loose, stiff, moist, no 6,16,20 130 SW odor, no stain · -- 50 8,16,16 0 ,, ., ,, ., ,. ., . -- 50 -- 55 ~ 55 -- 60 m 60 ~ 65 ~ 65 ~ 70 ~ 70 DRILLING METHOD: Mobile B-53, 8"-OD hollow-stem auqer DATE DRILLED: September 4, 19.96 SAMPLER TYPE: 2"-diameter California modified split spoon LOGGED BY: K. Mitchell, REA TOTAL BORING DEPTH: 51 fb.q APPROVED BY: M. Magar(:jee, RG #4892 DEPTH TO WATER: Not encountered DRILLED BY: Melton Drilling Company ~,~_~ I-IOLGUIN, B-11 ~ :F'AI-IAN & LOG OF EXPLORATORY BORING ~ ASSOCIATES, INC. Page 2 of 2 COMPLETION DETAI~ SAMPLE CLIENT: Mr. John M. and Mrs. Deanna J. McCauley n- --I GROUNDWATER WELL -~ PROJECT: California Sheet Metal ~ ~ VADOSE WELL ~, 'r ' ' 0 ! SPARGEWELL .-I ~_~ ~ 9~= ~ - ~ ~ LOCATION: 601 Eureka Street, Bakersfield, California ~z . , BORING o DESCRIPTION AND SOIL CLASSIFICATION CASING: N/A -- NAME: %gravel/sand/fines. gradation/plasticily, color, angularity, SLOT SIZE: N/A maximum.size (gravels), density/consistency, moisture, odor, stain FILTER PACK: N/~~ SILT: 0/5/95, with sand, Iow plasticity, brown, loose, M~SM soft, moist, no odor, no stain q~qqqq, 2,2,3 0 .... ,, -- 5 ~ 10 SILTY FINE SAND: 0/80/20, brown, loose, soft, moist, 3,5,7 0 SM I' no odor, no stain ~ ~~, ~ 15 ~ 15 5,8,10 0 ~~, ~ 20 SAND: 0/90/10, well graded, tan, subangular, loose, 3,8,8 0 SW %%%%~%, 20 soft, moist, no odor, no stain ,,%%,,,,,,, ~ SILTY SAND: 0/85/15, brown, subangular, dense, stiff, 3,4,10 >2,000 SM ~~,~ 25 moist, strong hydrocarbon odor, no stain ~-- 30 0/95/5, no odor 4,8,10 20 ~~-~ 30 ~ 35 ~%~'~ 35 DRILLING METHOD: Mobile B-53, 8"-OD hollow-stem auger DATE DRILLED: September 4, 1996 SAMPLER TYPE: 2"-diameter California modified split spoon LOGGED BY: K. Mitchell, REA TOTAL BORING DEPTH: 51 fbg APPROVED BY: M. Magargee, RG ff4892 DEPTH TO WATER: Not encountered DRILLED BY: Melton Drilling Company ~ ~~ · LOG OF EXPLORATORY BORING B-12 ,~ A~OC~TES, INC. Page 1 of 2 COMPLETION DETAIL SAMPLE CLIENT: Mr. John M. and Mrs. Deanna J. McCauley -_- GROUNDWATER WELL .u PROJECT: California Sheet Metal ~ .~, (/) ~ VADOSE WELL ~ ~m~ ~ LOCATION: 601 Eureka Street, Bakersfield,. California o-Z ~ ~ ~ ~x BORING ~ Q DESCRIPTION AND SOIL CLASSIFICATION ~ m CASING: ~ N/A _. _ SLOT SIZE: N/A NAME: %gravel~sand~fines, gradation/plasticity, color, angularity, FILTER PACK: N/A maximum size (gravels), density/consistency, moisture, odor, stain ~-- 35 6,8,10 0 SM ,~,~,~,?~,~,-- 35 CLAYEY SILT: 0/0/100, moderate plasticity, brown, 5,7,10 50 M~CL loose, soft, moist, slight hydrocarbon odor, no stain ~ 45 SAND: 0/90/10, well graded, tan, subangular, loose, 8,10,16 110 SW soft, moist, ve~ slight degraded hydrocarbon odor, no ~~' stain ~ 50 no odor 7,14,16 10 55~'~'5~'; -- 50 ~ 55 ~ 55 60 ~ 60 -- 65 ~ 65 ~ 70 -- 70 DRILLING METHOD: Mobile B-53, 8"-OD hollow-stem auger DATE DRILLED: September 4, 1996. SAMPLER TYPE: 2"-diameter California modified split spoon LOGGED BY: K. Mitchell, REA TOTAL BORING DEPTH: 51 fbg APPROVED BY: M. Ma9ar9ee, RG ff4892 DEPTH TO WATER: Not encountered DRILLED BY: Melton Drilling Company B-12 & LOG OF EXPLORATORY BORING ~ ASSOC~TES, INC. Page 2 of 2 LITHOLOGY (UNIFIED SOIL CLASSIFICATION SYSTEM) GROUP TYPICAL NAMES MAJOR DIVISIONS SYMBOLS WELL-OR,~XO oP~VELS, G~VEL-S~O :- GRAVEL GRAVELS WITH LITTLE GW .~URES, LITTLE OR NO FINES ~ < P(~DRLY-GRAD~D GRAVELS OR ~ ~ MORE THAN OR NO FINES GP GRAV[L-S~O MIXT~ES, LITT~ OR NO FINES O ~ HALF COARSE ~ ~ SIL~ GRAILS, o F~ION IS G~ O.AVEL-S~S~T a~U~ES ~ ~ > ~RG[R T~ G~V[kS W~H OV[R m c~Y ~VtLS, __ ~ ~ No. ~ SIEVE SIZE 12~ FINES ~C ~L-S~~U~S ~ SW ~DS. UTTL[ ~ ~ FI~S ~ z d SAND SANDS W~H LI~LE ~ z z OR NO FINES ~RLY~R~D S~m OR G~LLYS~DS, ~ ~ORE THAN SP LmTT~ OR NO F~NES ~ ~ HALF COARSE 0 ~ F~ION IS S~ S~LW S~S, ~maLT .~URES ~ 0 S~ALLER THAN SANDS W~H OVER = NO. 4 SIEVE SIZE 1 Z% FINES SC CL*~S~NDS, ~V ~TmES INORG~IC ~LTS ~D VERY FINE S~DS, ROCK FLOUR, ~ ~ L s,L~ OR C~YEY RNE S~ ~ ~Y FINE ~NDS ~ ~ OR CLA~Y SILTS WITH SUGHT -- ~ ~ ,~.o~,c ~.~ o. ~ow TO maU..~T,C,W. ~ SILT AND CLAY CL O..v~YC~S.S~C~.s,~WCL*YS.~C~YS ~ ~ 0 OL ORGANIC SILTS ~D ORGA~C ~L~ C~YS OF ~ ~ 0 LOW Z ~ ~ ~ j ~H ,.O.O~,CS,~TS..C*~OUSO.~TO.*C~SFI.~ : SILT AND CLAY CH INORG~,C ~ OF HIGH ~T~I~, FAT C~YS Z~ ~ ~ OH OR~C C~ ~OR~cMEDlUH~LTsTO HIGH ~Jla~, HIGHLY ORGANIC SOIL Pt p~J A~ OTHER H~HLYORG~ ~1~ SYUBOLS AND NOTES m SAUPLE COLLE~ED FOR ANALYSIS ~ ASPHALT ~ SAMPLE NOT RECOVERED ~ CONCRETE ~ BENTON~E GRO~ ~ GROUNDWATER ENCOUNTERED DURING DRILLING - ~ BENTONITE CHIPS ~ STABILIZED WATER LEVEL (DATE) ~ FILTER SAND PACK (DATE) ~ WELL BOX W~H LOCKING CAP PID = PHOTOIONIZATION DETECTOR ppmv = PARTS PER MILLION BY VOLUME BLANK PVC CASING USCS = UNIFIED SOIL CLASSIFICATION SYSTEM ~ _ SLO~ED PVC CASING (O.OZ" SLOTS) gw = GROUNDWATER WELL, ~ = VADOSE WELL = fbg = FEET BELOW GRADE ~ BOSOM PLUG OD = OUTSIDE DIAUETER __~_ ._ HO~UIN, ~ ~~ · KEY TO LOG OP EXPLORATORY ~ ASSOC~TES, INC. Revision 7/95 HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL MANAGEMENT CONSULTANTS ATTACHMENT 5. LABORATORY REPORT FOR SOIL HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL LABORATORIES 143 South Figueroa Street · Ventura, California 93001 · (805) 652-0219 · FAX: (805) 652-0793 Sept~nber 25, 1996 CLIENT: John & Deanna McCauley John & Deanna McCauley Post Office Box 2348 Bakersfield CA 93303-2348 PROJECT: California Sheet Metal REPORT OF ANALXTICAL RESULTS Pag~ 1 Analyzed By: V. de Vera Sampled By: K. Mitchell Un/ts: mg/kg Matrix: Soil Analyses Method: BTEX: EPA 8020 TPH: 8015-M CONCENTBAT ION OF ~OTAL PETROLEIIM H~DROCARBONS (TPH) WITH BTEX D~STINCTION CONSTITUENT TPH- TP[t- Ethyl Total Percent Lab Sample Dates Sampled, Gas Diesel Benzene Toluene Benzene Xylenes MTBE Surrogate NO. No. Received and Tested MRL MRL MRL MRL MRL MRL MRL Recovery 962840 B-10-15 9/4/96 9/9/96 9/12/96 2400 ND 200 25 300 i02% lO .005 .005 .015 .015 962841 962842 962843 962844 4100 10 2800 10 190 10 5900 10 962845 962846 962847 962848 962849 962850 962851 962852 962853 B-10-25 9/4/96 9/9/96 9/11/96 B-10-35 9/4/96 9/9/96 9/11/96 B-10-45 9/4/96 9/9/96 9/12/96 B-10-55 9~4~96 9/9/96 9/12/96 B-10-65 9/~/96 9/9/96 9/11/96 2600 " I0 B-10-75 9/4/96 9/9/96 9/10/96 ND <M~tL 10 B-10-85 9/4/96 9/9/96 9/10/96 ND <MRL 10 B-10-90 9/4/96 9/9/96 9/10/96 ND <MRL 10 B-11-15 9/4/96 9/9/96 9/10/96 ND 10 B-11-30 9/4/96 9/9/96 9/10/96 260 10 B-11-45 9/4/96 9/9/96 9/10/96 ND <MRL 10 B-11-50 9/4/96 9/9/96 9/10/96 ND <MRL 10 B-12-10 9/4/96 9/9/96 9/10/96 ND <MRL 30 MRL = Method Reporting Limit ND ~ Not Detected at or above MRL Lab Certification: CAELAP #]878; 1/31/96 ND 29 48 160 100% .005 .005 .015 .015 14 39 49 74 118% .005 .005 .015 .015 ND .24 .53 8.3 103% .005 .005 .015 .015 8.1 50 97 160 99% · 005 .005 .015 .015 34 140 340 320 103% ,005 .005 .015 .015 ND .024 ND .037 106% .005 .005 .015 015 .72 .77 .061 .34 107% .005 .005 .015 015 ,36 .52 .039 .2 103% · 005 ,005 ,015 015 106% ND ND ND .005 .005 .015 ND 015 ND .015 .029 1.4 115% .005 .005 .015 015 ND ND ND ND 68% · 005 ,005 .015 015 ND ND ND ND 105% .005 .005 .015 015 ND ND ND ND 104% · 005 .005 .015 015 HOLGUIN, FAHAN & ASSOCIATES, E NVI FION MENTAL LABORATOR lES INCo September 25, 1996 143SouthagueroaStreet. Ventura, California93001. (805) 652-0219- FAX:(805) 652-0793 REPORT OF ANALYTICAL RESULTS CLIENT: John & Deanna McCauley John & Deanna McCeuley Post Office Box 2348 Bakersfield CA 93303-2348 PROJECT: California Sheet Metal Pag~ 2 Analyzed By: V. de Were Sampled By: K. Mitchell Units: m9/kg Matrix: Soil Analyses Method: BTEX: EPA 8020 TPH: 8015-M CONCENTRATION OF TOTAL PETROLEUM HYDROCARBONS (TPH) WITH BTEZ DISTINCTION CONSTITUENT TPH- TPH- Ethyl Total Percent Lab Sample Dates Sampled, Gas Diesel Benzene Toluene Benzene Xylenes MTBE Surrogate No. No. Received and Tested MRL MiRL MRL MRL MRL M~L MRL Recovery 962854 B-12-25 9/4/96 9/9/96 9/11/96 1400 .0054 .16 3.4 35 122% 10 .005 .005 ,015 .015 962855 B-12-40 9/4/96 9/9/96 9/10/96 ND <MRL .0083 .065 .047 .47 111% I0 .005 .005 ,015 .015 962856 B-12-50 9/4/96 9/9/96 9/10/96 ND <MRL ND ND ND ND 102% 10 .005 .005 ,015 .015 MRL = Method Reporting Limit ND - Not Detected at or above MRL Lab Certification: CAELAP 91878; 1/31/96 Laboratory Manager: ENVIRONMENTAL LABORATORIES 2550 Ea$1man Ave., Unil 1, Ventura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 METHOD BLANK REPORT REPORT OF ANALYTICAL RESULTS Report Dale: 12-Sep-96 Date Analyzed: QC Baich ID: MBS 9/10/96 Analyzed By: Instrumenl iD: HP 5890 GC-1 Analysis Method: 10-Sep-96 V. de Vera 8015-m/8020 Lab No. CONCENTRATION OF TOTAL PETROLEUM HYDROCARBONS (TPH) WITH BTEX DISTINCTION in mg/Kg (soil) TPH- Ethyl Total Client Gasoline Benzene Toluene Benzene Xylenes Sample No. Matrix ~vi~el MI?L M£1_ MI?L MRL MBS 9/10/96 Method Blank Soil ND ND ND ND ND I0 0.00,,¢ 0.005 0.015 0.01,,¢ Volatile fuel hydrocarbons ate quantilated against a gasoline standard. Hydrocarbons deJecled by this method range fromC6toC15. Analyies repoded as ND were not present above JhestaJedlimif of dejection. MRL = Method Reporting Limi! ND = l,,loJ Delecled al or above MRL LABCER11FICAIION: CAELAP #1878:1/31/96 HOLGUIN, FAHAN & ASSOCIATES INC. ENVIRONMENTAL LABORATORIES 2550 Eastman Ave., Unit 1, Ventura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 METHOD BLANK REPORT REPORI' OF ANALYTICAL RESULTS Report Date: 12-Sep-96 QC Botch ID: MBS 9/10/96 #2 Instrument ID: HP 5890 GC-1 Date Analyzed: Analyzed By: Analysis Method: 1.0~Sep-96 V. de Vera 8015-m/8020 Lob Ida. CONCENTRATION OF TOTAL PETROLEUM HYDROCARBONS (TPH) WITH BTEX DISTINCTION in rog/Kg (soil) TPH- Elhyl Total Client Gasoline Benzene Toluene Benzene Xylenes Sample No. Matrix /vIRI MRL MRL MRL MRL MBS 9/10/96 #2 Method Blank #2 Soil ND ND ND ND ND I0 0.005 0.005 0.015 0.015 Volatile fuel hydrocarbons are quantilaied against a gasoline standard. Hydrocarbons detected by this method fangeflomC61oCIS. Analyfes reporied as ND were not present above the stated limii ot detection. /',ARL: lvlethod Reporting Limit ND = Ix/of Detecled at or above MRL LAB CERIIFICA11ON; CAELAF # ) 878; 1/31/96 HOLGUIN FAHAN ASSOCIATI S, INC. ENVIRONMENTAL LABORATORIES 2550 Eastman Ave., Uni~ 1, Ventura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 METHOD BLANK REPORI REPOR1~ OF ANALYTICAL RESULTS Repori Dale: 12-Sep-96 Da~e Analyzed: QC Balch ID: MBS 9/11/96 Analyzed By: Instrument ID: HP 5890 GC-1 Analysis Method: 11-Sep-96 V. de Vera 8015-m/8020 Lab No. CONCENTRATION OF I~OTAL PETROLEUM HYDROCARBONS (TPH) WITH BTEX DISTINCTION in rog/Kg Jsoil) TPH- Ethyl Total Client Gasoline Benzene Toluene Benzene Xylenes Sample No. Matrix MRL MRL MRL MRL M£L MBS 9/11/96 Method Blank Soil ND ND ND ND ND 10 0.005 0.005 0.015 0.015 Volatile fuel hydrocarbons ate quaniiialed agains! a gasoline standard. Hydrocarbons detecled by this method langeflomC6foC15. Analy'les~eporiedasNDwereno~pfesentabove~heslatedlimH olde~ec~'ion. MRL: Melhod Reporiing Limii ND = Noi Delecied at of above MRL LABCERTIFICAI'ION: CAELAP #1878:1/31/96 HOLGUIN, FAHAN & ASSOCIATES, INCo ENVIRONMENTAL LABORATORIES 2550 Easlman Ave., Uni! 1, Ventura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 METHOD BLANK REPORT REPORT OF ANALYTICAL RESULTS Report Dale: 13-Sep-96 Date Analyzed: QC Batch iD: MBS 9/12/96 Analyzed By: Indrumenl ID: HP 5890 GC-1 Analysis Method: 12-Sep-96 V. de Vero 8015-m/8020 Lab No. CONCENTRATION OF TOTAL PETROLEUM HYDROCARBONS (TPH) WITH BTEX DISTINCTION in mg/Kg (soil) TPH- Ethyl Told Client Gasoline Benzene Toluene Benzene Xylenes Sample No. Matrix MRL MRL MRL MRL MRL MBS 9/12/96 Method Blank Soil ND ND ND ND ND 10 0005 0.005 0.015 0.015 Volatile fuel hydrocarbons are quantilated against a gasoline standard. Hydrocarbons defected by 1his method range fromC6toCl§. AnalytesfepoTtedas NDweTenot pTesenf above the stated limit of detection. MRL = Iv~eThod Reporting Limit ND = Not Detected at or above MRL LABCER'fiFICATION: CAELAP #1878:1/31/96 HOLGUIN, FAHAN & ASSOCIATES, INCo ENVIRONMENTAL LABORATORIES 2550 Eadman Ave., Unit 1, Ventura, CA 93003¥(805)650-7750¥FAX (805)650-6810 Sample ID: CPT-18-5 Dale Analyzed: 10-Sep-96 Lab No: 962815 Matrix: Soil Instrument ID: HP 5890 GC-1 Dilution Factor: 1 Matrix Spike Worksheet EPA 8020 Matrix Spike Results Compound Sample Matrix Spike Spike Sol. Recovery Control Conc.(ppb) Conc.(ppb) Conc.(ppb) (%) Limits MTBE 0.00 96 100 96 45-158 Benzene 0.00 92 100 92 59-138 Toluene 0.00 88 100 88 59-133 Ethylbenzene 0.00 82 100 82 55-123 m,p-Xylenes 0.00 83 t00 83 53-135 o-Xylene 0.00 82 100 82 59-130 Matrix Spike Duplicate Results :Compound Sample Matrix Spk. Dup Spike Sol. Recovery Control Conc.(ppb) Conc.(ppb) Conc.(ppb) (%) Limits iMTBE 0.00 98 100 98 45-158 Benzene 0.00 92 100 92 59-138 [oluene 0.00 90 100 90 59-133 Ethylbenzene 0.00 84 100 84 55-123 m,p-Xylenes 0.00 85 100 85 53-135 o-Xylene 0.00 84 t00 84 59-130 Average Recovery & RPD Data Compound Spike Matrix Spk. Dup Average %RPD Control Recovery Recovery Recovery Limits MTBE 96 98 97 1.7 <22 Benzene 92 92 92 0.3 <14 Toluene 88 90 89 t.6 < 14 Ethylbenzene 82 84 83 2.3 < 16 m,p-Xylenes 83 85 84 2.4 <16 o-Xylene 82 84 83 2.5 < 15 HOLGUIN, FAHAN & ASSOCIATES, ENVIRON[v]ENTAL LABORATORIES INCo P5.50 Ec-~i .... -'"= 5cr'.-.p:e .x'- .... .-]-i i-4q D.c'=,_ .-.n~:~ ze.o:" ~' ' ~C.-Sec-95. . Lob ;',.'c: 962 '~.~ ',ns~rup-.e r.f.~.IP~' HP f.~ ? C:, GC-1 u..,,u,,,_ ;.r'":' .... Foc fen I Spike ',^,/crkshe et EPA 8020 Motrix~F_.~,._- q : - Resulls ~n ,.~:= Matrix $,oike S?..,K= $OI. Ccnlroi Cc-r.c.(¢~b) Ccnc.(ppb) C,~nc.~,~ cb.I ~%) ~'miis Ee~zene 0.60 .I ii0 !00 '1 'i"0" S9'-I 38 Toluene 0.~0 97 ] 100 97 ~x- ~3 ~,h/:~=nzen_ ~ 0.00 9~ i00 S5-i23  0.00 .. 93 i00 ~ ~-~c.~ c-xx nh I~ ~ 92 i00 92 '" 59-'130 pk. Dup Recover/ Control i Conc.(pcb) Conc.(pcb} ~ Concjppb) (%) Limils M~ ~E/O.O0 108 1 O0 i 08 45- t 58 ~enzene 0.00 co 1 O0 99 ~, - 1 ~8 Toluene 0.0'0 ' "9f i00 99 -'~-133 Ethyl~enzene '~.0'~ 94 100 9'4' 55-i 23 m p X~, 0.~0 95 100 95 53-135 o-Xy~ene I 0.00 94 100 f'~ 59-130 Averoge Recovery & RPD Dolo HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL LABORATORIES 2550 Easiman Ave., Unit 1, Ventura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 Sample ID: B-11-15 Date Analyzed: 11-Sep-96 Lab No: 962849 Matrix: Soil Insfrumed ID: HP 5890 GC-1 Dilution Factor: 1 Matrix Spike Worksheet EPA 8020 Matrix Spike Results Compound Sample Matrix Spike Spike Sol. Recovery Control Conc./ppb) Conc.(ppb) Conc.(ppb) (%) Limits MTBE 0.00 99 1'00 99 4.5-158 Benzene 0.00 103 100 103 59-138 Toluene 0100 89 100 89 59-153 Ethylbenzene 0.00 85 1 O0 85 55-12'3 m,p-Xylenes 0.00 86 lbO 86 53-135 O-Xyle ne 0.00 85 1 O0 85 59-130 Matrix Spike Duplicate Results Compound Sample Matrix Spk. Dup Spike Sol. Recovery Control Conc.(ppb) Conc. Jppb) Conc.(ppb) (%) Limits /~TB E 0.00 98 1 O0 98 45-158 Benzene ' 0.~)0 95 100 95 59-138 Toluene 0.00 90 100 90 59-133 Ethylbe'nzene 0.00 87 100 87 55-123 m,p-Xylen~'~ 0.00 86 1 O0 86 53-135 o-Xylene 0.00 86 100 86 59-130 Average RecoveW & RPD Data ~ompaund Splke Matrix Spk. Dup Average %RPD Control Recovery Recovery Recovery Limits ~4TBE 99 98 98 1.0 <22 Benz'ene 103 95 99 7.4 < 14 [oluene 89 90 90 1.1 < 14 Eihylbenzene 85 87 86 1.5 < 16 m,p-Xyienes 86 86 86 0.4 < 16 o-Xylene 85 86 85 0.7 <15 HOLGUIN, FAHAN & ASSOCIATES, INC. ENVIRONMENTAL LABORATORIES 2550 Eastman Ave., Unit 1, Ventura, CA 93003¥(805) 650-7750¥FAX (805) 650-6810 Sample ID: l'K2-e-3' Date Analyzed: 12-Sep-96 Lab No: 962866 Matrix: Soil Inslrument ID: HP 5890 GC-1 Dilution Factor: 1 Matrix Spike Worksheet EPA 8020 Matrix Spike Results Compound Sample Matrix Spike Spike Sol. Recovery Control Conc.(ppb) Conc.(ppb) Conc.(ppb) (%) Limits MTBE 0.00 101 100 101 45-158 Benzene 0.00 101 100 101 59-138 Toluene 0.00 90 100 90 59-133 Ethylbenzene 0.00 86 100 86 55-123 m,p-Xylenes 0.00 86 100 86 53-135 o-Xytene 0.00 86 100 86 59-130 Matrix Spike Duplicate Results Compound Sample Matrix Spk. Dup Spike Sol. Recovery Control Conc.(ppb) Conc.(ppb) Conc.(ppb) (%) Limits MTBE 0.00 95 100 9,5 45-158 Benzene 0.00 95 100 95 59-138 Toluene 0.00 96 100 96 59-133 :_thylbenzene 0.00 91 100 91 55-123 m,p-Xylenes 0.00 92 100 92 53-135 0-Xylene 0.00 91 100 91 59-130 Average Recovery & RPD Data ~ompound Spike Matrix Spk. Dup Average %RPD Control Recovew Recovew Recovew Limits MTBE 101 95 98 6.4 <22 Benzene 101 95 98 5.4 <14 Toluene 90 96 93 6.2 <14 Ethytbenzene 86 91 89 6.0 < 16 m.p-Xylenes 86 92 89 6.5 < 16 o-Xyiene 86 91 88 6.5 <15