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• _ constructed using a kngtng 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 feet/feet 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 <br /> w ELEVATION WATER ELEVATION <br /> sn191 M W I 16 16 6257 4642 <br /> TM MW2 1548 6173 -4625 <br /> MW3 1557 6019 X44 62 <br /> Notes Assumed datum based on USGS 7 5 minute Stockton East Quadrangle Map <br /> B 0 LABORATORY ANALYSIS - SOILS <br /> One sample from each bonng, the sample collected at the sotllgroundwater 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 /> According to laboratory analyses, toluene was the only constituent detected above method <br /> detection limits 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 3 <br /> i� <br /> 49 <br /> 1 <br /> M <br /> hq <br /> t <br /> I <br /> C71�V3-1-fm 967 C <br /> CSRMI 5 <br /> t?A <br /> • <br />