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i <br /> In December 1989,WaterWork Corp drilled and sampled 5 soil borings to determine the extent <br /> of lead Impaction In the vicinity of the former underground product storage tanks (Figure 3) <br /> Laboratory analyses of the soil samples collected during dnlling determined that all borings <br /> contained non-detectable lead concentrations(WaterWork report dated June 1, I990) However, <br /> petroleum hydrocarbon constituents were detected at levels above method detection limits in soil <br /> samples collected from SBI and SB2 A summary of laboratory results are presented In Table <br /> I Laboratory reports with chain-of-custody documents are included In Appendix I <br /> Investigation of potential groundwater contamination was required by SJCPHS <br /> Table 1 Chevron Stockton Laboratory Analysis of Sails - December 1989 Results <br /> presented In mg/kg (ppm) <br /> DATE SAMPLE ID BENZENE TOLUENE ETHYL XYLENES TPHG LEAD <br /> BENZENE (1) (2) <br /> 12106189 S81 I S 0 036 009$ 015 91 300 NO <br /> S9125 ND NO NO ND NO ND <br /> S131-35 ND 002 ND 0 015 ND ND <br /> SHI-40 ND ND ND NO NO NO <br /> 12108189 58110 ND NO ND NO ND ND <br /> SB2 25 0 030 0 042 0 059 0 096 ND ND <br /> SB2 30 NO ND ND ND ND ND <br /> S112 35 NO 0 045 0 024 014 10 ND <br /> txs SBZ 40 ND NO NO ND NO ND <br /> s 12111/89 5113.40 ND NO ND ND ND ND <br /> PA 12111189 584-35 NO NO NO NO NO NO <br /> S84-40 NO NO NO NO NO NO <br /> x <br /> 12111189 S115-30 ND NO NO NO NO NO <br /> SBS-35 NO NO NO ND NO NO <br /> SB543 NO ND ND NO ND ND <br /> Method Detection Liauts 000$ 001 001 0 OI 10 0 S <br /> m, Notes <br /> TPHO =Total Ktroleutn Hydrocarbons as Gasoline <br /> BTEX =Analysts by EPA m shod 801518020 <br /> (1) -Analysis by EPA awthod 8015 <br /> (2) o DHS Methodology <br /> ND =Compounds Not Det.6nd above h1.thod W"tion Lunus <br /> Ch.—U.5 A.W 367 <br /> C3079t Z <br /> .a <br />