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sa <br /> PROBLEM ASSESSMENT REPORT <br /> Moore Petroleum, Inc. <br /> 1399 E. Yosemite Avenue, Manteca, CA <br /> NGA Protect No. 10-90-430 <br /> Page 10 <br /> TABLE 3 <br /> Ground. Water Elevation Data <br /> Reference Depth to Ground Water <br /> Elevation Ground Water Elevation <br /> Well I.D. Date 'msl !feet) (msl) <br /> T3Fn-1A 06/28/90 40.23 25.93 14,26 <br /> 08/27190 40.13 24.20 15.93 <br /> MW-2 06/28/90 40.99 26.78 14.21 <br /> 08/27/90 40.99 25.04 15.95 <br /> MW-3 06/23/90 41.27 27.11 14.16 <br /> 08/27/90 41.27 25.38 15.89 <br /> A.7 [around-Water Analytioal Results <br /> Ground--water samples have been collected at the site in August, 1988, <br /> (ETS) ; April, 1989, and July, 1990, (NGA) . At each sampling event <br /> ground-water samples have been analyzed for BTEX, EDC, EDB, and TPH <br /> by a California--certified laboratory. Results of all ground--Vater <br /> sampling at the site are suimarized in Table 4. Laboratory analytical <br /> x reports are presented in Appendix B. <br /> Examination of Table 4 indicates that concentrations of petroleum <br /> constituents in ground water at the site have generally been very low, <br /> with concentrations of BTEX constituents generally below or slightly <br /> above maximum contaminant levels (mels) . Results of the most recent <br /> sampling event indicate that BTEX constituents were not detected at <br /> monitoring wells MFT-2 or MW-3 but were detected at the new monitoring <br /> - well, MW-1A. Benzene was detected at MW-1A at a concentration of 72 <br /> parts per billion (ppb) during the most recent sampling event, <br />