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FIRST QUARTER, 1997 GROUNDWATER MONITORING REPORT ' USA STATION#65-LODI FEBRUARY, 1997 Concentrations of TPH G for the sampling event ranged from 58 micrograms per liter(gg/1) in ' MW-8 to 14,000 jig/l in S-2 TPH G was non-detect at the method detection limit (ND) in wells MW-1 through MW-7 Benzene was detected in two monitoring wells (S-1 and S-2) at ' concentrations of 110 µg/1 in S-1 and 990 µg/1 in S-2 Benzene was ND in wells MW-1 through MW-8 MTBE was ND in all wells, except MW-8 where it was reported at 9 µg/I Analytical results are summarized in Table 2, and shown on Figure 5 Copies of laboratory reports and COC documentation are included in Appendix B The groundwater elevations have increased an average of 2 56-feet since the groundwater ' gauging on October 10, 1996, and are at a historical high This high groundwater may have come in contact with some impacted soil in the vicinity of the UST's, which may explain the increase of TPH G in S-1 and S-2 TPH G and BTEX were non-detect in MW-3 The thirduarter, 1996 sample q p e results for MW-3 indicted TPH G and benzene at 7,000 and 35 µg/1, respectively Historical analytical results for 1 MW-3 have been ND to very low petroleum hydrocarbon values The positive identification of hydrocarbon constituents have not been repeated for MW-3 Therefore, the third quarter results are assumed to be an anomaly at this time The down adient wells continue to be non-detect on detect for TPH constituents There does not appear to be any indication of plume migration At this time, Park recommends that monitoring be ' continued r 1 5