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Table 3 Chevron Stockton Laboratory Analysts of Soils - April and May 1991 Results presented In mg/kg (ppm) SAMPLE ID BENZENE TOLUENE 1317HY1, XYLENES TPHG TPHD DATE BENZENE (1) (2) 4129 511191 MWI.65 5' NO 0 027 NO NO NO ND MW2-655 ND 0015 NO NO NO NO MW7-65 5' ND 0 016 NO ND NO ND Detection Lauts 0 OOSO D OOSO 00050 00050 t 0 t 0 Nates BTEX =Analysts by EPA method 801 S18020 TPHG s Total Petroleum Hydrocsrbans as Oasoltne TPHD a Total Petroleum Hydrocarbons is Diesel (1) =Analysis by Modified EPA method BOB (2) =Analysis by Modified EPA method 8015 ND n Compounds Not Detected above Method Dctechua 1-mus 7 0 LABORATORY ANALYSIS - GROUNDWATER To accurately determine groundwater quality beneath the site, groundwater samples were collected from each monitoring well on May 7, lune 21, and August 22, 1991 During each sampling round, groundwater samples were collected after parging approximately 3 to S well volumes of water from each well After adequate purging, groundwater samples were collected from each monitoring well using a new disposable Teflon bailer Stabilization of EC, pH, and temperature was checked prior to sample collection to ensure samples collected were representative of formation water All samples were sent to state-certified Sequoia Analytical laboratories and analyzed for BTEX using EPA methods 8015, and TPHG and TPHD using modified EPA method 8015 Laboratory results from the May 7, 1991 sampling round detected low levels of benzene, toluene, ethylbenzene, xylenes, and TPHG 1n monitoring well MW 1 Low levels of benzene, xylene,TPHG and TPHD were also detected in monitoring well MW2 No dissolved petroleum hydrocarbon constituents were detected to well MW3 No constituents were present above W Maximum Contaminant Levels(MCLS) established by the State Department of Health Services. Cb—USA ac M7 csao7vt 6