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iY <br /> f <br /> E <br /> Pl:OBLEA ASSESSMERT REPORT <br /> Moore Petroleum, Inc. <br /> 14SOU W. Frontage Road, Manteca, CA <br /> NGA Project No. 10.40-470 <br /> Page 11 <br /> TABLE 4 <br /> Grouzd Water Elevation Data <br /> Depth to Reference Ground Water <br /> Ground Water Elevation Elevation <br /> y <br /> Well I.D. Date _ (feet} fmslI lmsl} <br /> MW-1 7/06/90 30,07 38.56 8.49 <br /> 8/23/90 29.53 9.03 <br /> MW-2 7/06/90 29.57 38.49 8.92 <br /> 8/7.3/90 29.34 9.15 <br /> MW-3 7/06/90 30.48 39.15 8.67 <br /> 8/23/90 29.96 9.19 <br /> ,MW-4 7/06/90 29.14 37.55 8.41 <br /> 8/23/90 28.56 8.99 <br /> BMW-5 7/06/90 28.57 37.70 9113 <br /> 8/23/90 28.16 9.54 <br /> 4 <br /> MW-6 7/06/90 28.07 36.53 8.146 <br /> y 8/23/90 27.51 9.02 <br /> tr149-7 7/06/90 27.39 35.66 8.27 <br /> "y 8/23/90 26.80 8.86 <br /> ;., W-8 7/06/90 29.81 39.17 9.36 <br /> 6/23/90 29.78 9.39 <br /> 3.7 Ground-Water Analytical Results <br /> Ground-water samples have been collected at the site in August, <br /> 1988, (ETS) ; May, 1989, and January, 1990, (Dalta) ; and July, 3990, <br /> (NGA) . At each sampling event ground-water samples have been <br /> analyzed for BTEX, EDC, EDB, and TPH by a California-certified , <br /> laboratory. Results of all ground-water sampling at the site are <br /> summarized in Table 5. Laboratory analytical reports are presented <br /> -- in Appendix B. <br /> Examination of Table 5 indicates that concentrations of petroleum <br /> constituents at MW-1, MW-2, MW-E, MW-7, and MW-8 are low, with <br /> concentrations of BTEX either not-detectible (MU-? ;and MW-8) or <br /> below or near maximum contaminant levels (mcls) (MW---i, MW-6 and MW- <br /> ------ during._the__inost_-recent._samp1 ng--event...._..Concentrations-...of--BTEX ...---- <br /> `- . constituents are significantly higher at :monitoring wells. MW-3, <br /> MW-4, and MW-5. Benzene was detected in these wells . at <br /> t <br /> t"� <br />