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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 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 /> ELEVATION WATER ELEVATION <br /> 5!7191 MW 1 16 16 6257 -4642 <br /> MW2 1548 6173 -4625 <br /> MW3 l5 57 6019 -44 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 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 /> 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 /> C'Wim USA W 367 <br /> CEa¢7v1 5 <br />