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i <br /> . In December 1989,WaterWork Corp drilled and sampled 5 soil bonngs to determine the extent <br /> of lead Impaction In the N.;.1n1ty of the former underground product storage tanks (Figure 3) <br /> Laboratory analyses of the soil samples collected during drilling determined that all bonngs <br /> contained non-detectable lead concentrations(WaterWork report dated June 1, 1990) However, „ <br /> petroleum hydroearhon 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 /> 1 Laboratory reports with chain-ot-custody documents are included In Appendix I <br /> Investigation of potential groundwater contamination was required by SJCYHS. <br /> Table 1 Chevron Stockton Laboratory Analysis of Soils - December 1989 R .ults <br /> presented to mg/kg (ppm) <br /> DAIS SAMPLE 1D BENZENE TOLUENE ETHYL- XYLENES TWO LEAD <br /> BENZENE (I) fn <br /> 12=%69 3B115 0 056 0 095 0 115 91 300 ND <br /> SBI-25 ND ND ND ND ND ND <br /> 38I-35 ND 002 1 ND 0015 ND ND <br /> - S8c-40 ND ND ND ND ND ND <br /> r 12/08189 SB2-10 ND ND ND ND ND ND <br /> SB2 25 0 030 0 042 0 059 1 0 096 Nr ND <br /> .. S82-30 ND ND ND ND ND w ND <br /> SB2 35 ND 0 045 0 024 014 10 ND <br /> �a SB2-40 NO ND ND ND ND ND <br /> 12111189 SB3-40 ND ND ND ND ND ND <br /> I2111189 58435 ND ND ND ND ND ND <br /> SB4-40 ND ND ND ND ND ND <br /> 12111189 385 30 ND ND ND ND ND ND <br /> 98535 ND ND Na ND ND ND <br /> b <br /> 3115.43 ND NO ND ND ND ND <br /> MAW IkleOW t.tttltla 0 005 001 001 001 10 03 <br /> .. <br /> Now <br /> TPHO =Tout Petroleum Hydrocarbons as GasWu e <br /> BTEX a Analysis by EPA method I 5!8020 <br /> (1) :Analysis by EPA awhod 9015 <br /> (2) .DHS Methodology <br /> ND -Compound+Nat Iktactdd above Method Detection Limits <br /> �w Chwrm U.&A.toe W7 <br /> cuumt 2 <br /> ko <br />