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1 <br /> TABLE 3 CONT. <br /> Historical Ground Water Analyses <br /> ' Date Benzene Toluene Ethyl Total TPH-Gas MTBE <br /> Collected (Ag/L) (µg/L) Benzene Xylene (ug/L) (µg/L) <br /> ' (Ag/L) (Rg/L) <br /> MW-6 <br /> 8/26/94 <5 <5 <5 <5 <50 NA <br /> ' 3/16/95 <0 3 <0 3 8 1 17 2,300 NA <br /> 6/22/95 <0 3 <0 3 3 3 4 8 760 NA <br /> 9/22/95 <0 3 <0 3 14 <0 6 770 NA <br /> 12/21/95 <0 3 1 <0 3 2 0 <0 6 840 NA <br /> ' 03/22/96 0 8 0 7 2 g--j 3 2 640 NA <br /> 06/19/96 <0 3 1 <0 3 1 8 2 I 270 <1 0 <br /> MW-7 <br /> 03/22/96 <0 3 <03 <0 3 <0 6 <50 NA <br /> 06/19/96 <0 3 <03 <0 3 <0 6 1 <50 1 <1 0 <br /> MW-8 <br /> 03/22/96 <0 3 0 4 12 2 7 420 NA <br /> ' 06/19/96 <0 3 <0 3 <0 3 <0 6 <50 <1 0 <br /> MW-9 <br /> 03/22/96 <0 3 <0 3 0 5 1 7 50 NA <br /> 06/19/96 <0 3 <0 3 <0 3 <0 6 <50 <1 0 <br /> NOTES <br /> NA= Sample not analyzed for constituent <br /> <=Less than detectable concentration listed <br /> NS =No sample collected at this location <br /> ' Data for events prior to June 22, 1995 are reported as listed in Remcor <br /> quarterly reports <br /> ' 5.2 Ground Water Gradient <br /> ' A ground water gradient map was produced from the data obtained from the June 19, <br /> 1996 sampling event (Figure 2) The elevations used in the calculation are summarized <br /> ' in Table 4 The newly installed monitoring wells, MW-7, MW-8 and MW-9 were not <br /> surveyed prior to this sampling event Therefore these three wells were not used in the <br /> calculation of the ground water gradient Although wells MW-2, MW-3 and MW-4 were <br /> ' not sampled during this event, depth to water measurements were collected and used in <br /> calculating the ground water gradient The ground water flow direction is toward the <br /> northwest during this sampling event This gradient and flow direction is consistent with <br /> ' previous monitoring events <br /> American Geological Services, Inc <br /> CA95DE-029 <br /> 10 <br />