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I , <br /> TABLE 2 <br /> RELATIVE GROUNDWATER ELEVATIONS <br /> ' Depth to Groundwater Relative Groundwater <br /> Relative Elevation <br /> ' Well No. Casing 10/3 2194 10193 2194 <br /> Elevation <br /> ' MW-1 101.62 40.28 38.30 61.34 63.32 <br /> MW-2 101.62` 40.24 38.33 61.35 63.29 <br /> ' MW-3 101.17` 39.55 37.54 62.52 63.63 <br /> MW-4 102.02 40.75 38.76 61.27 63.26 <br /> ' MW-5 101.54 40.11 38.19 61.43 63.35 <br /> AU measurements in feet <br /> t Revised 2/15/93 <br /> 1 <br /> 4.2 Groundwater Flow Direction and Gradient <br /> As in previous quarters, there appears to be a flexure in the groundwater gradient (Figure <br /> P q PP <br /> 3). South and east of the UST, groundwater flows to the north. West of the UST, <br /> ' groundwater flow is to the northeast. This apparent change in flow direction is an anomaly, <br /> and the reason for it is uncertain. Therefore, in order to eliminate the possibility of an error, <br /> the wells were re-surveyed on February 15, 1994. The re-survey confirmed the elevations of <br /> MW-1, MW-4, and MW-5; however, the elevations of MW-2 and MW-3 were revised 0.03 <br /> feet upward and 0.90 feet downward, respectively (Table 2). Although this revision does not <br /> eliminate the gradient flexure, it does imply that the previously reported steep gradient <br /> between MW-3 and MW-1 was erroneous. <br /> 1 4.3 Groundwater Sample Results <br /> Benzene and TPH as gasoline were detected in monitoring well MW-1 at nearly the same <br /> ' concentrations as in October 1993 (Table 3). However, neither toluene nor xylene were <br /> detected in the most recent sampling event. Only benzene was detected in MW-4. No <br /> contaminants were detected in the sample from MW-5. The laboratory results and chain of <br /> custody are attached in Appendix A. <br /> W...inl Audit Scry et.lac. .7 <br /> 1t'ueem Ur. WR <br /> Q -9/1-LIO J <br /> 1 <br />