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Table 3 Chevron Stockton Laboratory Analysis of Soils - April and May 1991 Results presented in mg/kg (ppm). SAMPLE is BENZENE TOLUENE MyLe XYLENES TPHG TPHD DATE BENZENE (1) (2) V29-5(1191 MW145 V ND 0023 ND HD ND HD Y MW1-b5 5' ND 0 015 ND ND ND ND MW3-63 5 ND 0 016 ND ND ND ND Detecuoa[Dams 00050 00050 00050 00050 10 1 !01 Now V= a Anslysu by EPA method 801515020 TPHG b Twat Petroleum Hydtacathom as dasolme TPHD .Tout Petroleum Hydrocaebons as Dicul (1) Amlysta by Madded EPA mothod 9015 (2) a Aaaiysts by Modifled EPA mmhad 8015 ND -Compounds Not Detected above Method Detection L MLI 7.0 LABORATORY ANALYSIS - GROUNDWATER To accurately determine groundwater quality beneath the site, groundwater samples were collected from each monitoring well on May 7, June 21, and August 22, 1991. During each sampling round, groundwater samples were collected after purging approximately 3 to 5 well • m 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 in monitoring well MW1 Low levels of benzene, xylene,TPHG and TPHD were also detected in monitoring well MW2 No dissolved petroleum hydrocarbon constituents were detected in well MW3 No constituents were present above Maximum Contaminant Levels(MCLs)established by the State Department of Health Services. cb. us A.%. xi 6 csaa>9t s