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1 SECOND QUARTER 1996 <br /> QUARTERLY MONITORING REPORT <br /> t USA PETROLEUM STATION#65 - LODI <br /> MAY, 1996 <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 during this quarter Concentrations of TPH G ranged from 71 micrograms per liter <br /> (µg/1) in MW-2 to 5,800 pg/l in S-1 TPH G was non-detect at the method detection limit wells <br /> MW-1, MW-3, MW-5, MW-6, and MW-7 Benzene was detected in six of the monitoring wells <br />' (MW-2, MW-4, MW-5, MW-8, S-1, and S-2) sampled during this quarter Benzene <br /> concentrations ranged from 0 79 pg/l (below regulatory action levels) in MW-5 to 680 µg/l in S- <br /> 1 Analytical results are summarized in Table 3, and shown on Figure 4 Copies of laboratory <br /> reports and COC documentation are included in Appendix B <br />' TPH concentrations appear to be declining in all wells Downgradtent wells continue to be non- <br /> detect for TPH constituents There does not appear to be any indication of plume migration At <br /> this time Park recommends the monitoring be continued <br /> 1 <br /> 1 <br /> 1 <br /> 5 <br />