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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 drilling determined that all borings <br /> contained non-detectable lead concentrations (WaterWork report dated June 1, 1990). However, <br /> petroleum hydrocarbon constituents were detected at levels above method detection limits In soil <br /> samples collected from SB1 and SB2. A summary of laboratory results are presented in Table <br /> 1. Laboratory reports with chain-of-custody documents are included in Appendix 1. <br /> Investigation of potential groundwater contamination was required by SJCPHS. <br /> Table 1. Chevron Stockton Laboratory Analysis of Soils - December 1989. Results <br /> presented in mglkg (ppm). <br /> DATE ` MPL91D BENZENE TOLUENE EMYL- XYLENES TP1io LEADSA <br /> BENZENE (1) Ry <br /> 12108/89 SBI-15 0 056 0 095 015 91 300 ND <br /> SBI-25 ND ND ND ND ND ND <br /> SBI-35 ND 002 ND 0 015 ND ND <br /> SRI-40 ND ND ND ND ND ND <br /> F <br /> 12w8189 S92-10 ND ND ND ND ND ND <br /> S132-25 0 030 0 042 0 059 0 096 ND ND <br /> I <br /> SB2-30 ND ND ND ND ND ND <br /> SB2-35 ND 0 045 0 024 014 10 ND <br /> SB2-40 ND ND ND ND ND ND <br /> 12\11189 SM 40 ND ND ND ND ND ND <br /> f <br /> 12\11189 SB4-35 ND ND ND ND ND ND <br /> S94-40 ND ND ND ND ND ND <br /> i 12/11/89 SBS-30 ND ND ND ND ND ND <br /> SBS-35 ND ND ND ND ND ND <br /> SB5-43 ND ND ND ND ND ND <br /> Method Detection Ltnuta 0 005 001 001 001 10 0 5 <br /> Notes <br /> TPHG =Total Petroleum Hydrocarbons as Gasolme <br /> BTEX - Analysts by EPA method 8015/8020 <br /> (1) — Analysts by EPA method 8015 <br /> (2) - DHS Methodology <br /> ND - Compounds Not Detected above Method Detection Limits <br /> i <br /> t�wnm <br /> U.3-A.tic. 367 <br /> =0'91 2 <br />