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I <br /> constructed using a kriging program, and are presented on Figure 7. According to information <br /> collected on May 5, 1991, the groundwater gradient at the site is in a northerly direction at <br /> 6 029 feettfeet. Groundwater measurements and elevations are presented in Table 2. <br /> Table 2. Chevron Stockton, Groundwater Monitoring Data - May 7, 1991. <br /> DATE WELL ID WELLHEAD DEPTH TO WATER v <br /> ELEVATION NATER ELEVATION <br /> 517191 MW 1 1616 6257 -46.42 <br /> MW2 1548 6173 -46.25 <br /> MW3 1557 6019 -44.62 <br /> Notes- Assumed datum based on USGS 7.5 minute Stockton East Quadrangle Map <br /> 4 <br /> 6.0 LABORATORY ANALYSIS - SOILS <br /> One sample from each boring, the sample collected at the soillgroundwater interface(65.5 feet), <br /> was submitted to state-certified Sequoia Analytical laboratory in Redwood City, California for <br /> . laboratory analysis. Selected samples were analyzed for BTEX using EPA method 8020, and <br /> TPHG and TPHD using modified EPA method 8015, respectively. <br /> i <br /> f According to laboratory analyses, toluene was the only constituent detected above method <br /> detection Iimits in all three monitoring wells. No other petroleum hydrocarbon constituents were <br /> detected in analyzed soil samples. A summary of the laboratory analyses is presented in Table <br /> 3 and laboratory reports with chain-of-custody documents are presented in Appendix III. <br /> F <br /> 1 <br /> r <br /> t <br /> I <br /> Chmm U.S.A.bm-3W y <br /> C'SRMI 5 <br />