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QUARTERLY MONITORING REPORT <br /> USA STATION#65-LODI <br /> APRIL,1996 <br /> 5.1 Groundwater Flow and Gradient <br /> Groundwater data collected at the site indicates that the depths to groundwater ranges from 43 13 <br /> to 46 01-feet bgs The groundwater elevations range from 8 13 to 3 47-feet below MSL The <br /> direction of groundwater flow has been calculated to be trending to the south, as shown on Figure <br /> 3 The average hydraulic gradient was calculated to be approximately 0 0046-ft/ft across the site <br />' 5.2 Results of Groundwater Laboratory Analyses <br /> TPH G was detected in five of the monitoring wells (MW-2, MW-4, MW-8, S-1, and S-2) <br />' sampled dunng this quarter Concentrations of TPH G ranged from 86 micrograms per liter <br /> (µg11) in MW-2 to 17,000 µg11 in S-2 TPH was non-detect in wells MW-1, MW-3, MW-5, MW- <br /> 6, and MW-7 Benzene was detected in five of the monitoring wells (MW-3, MW-4, MW-8, S- <br /> 1, and S-2) sampled during this quarter Benzene concentrations ranged from 1,400 µg/1 in S-2 to <br /> 1 4 µg/1 in MW-3 Analytical results are summarized in Table 3, and shown on Figure 4 Copies <br /> of laboratory reports and COC documentation are presented in Appendix B <br /> 1 <br /> 1 <br /> 5 <br />