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3.0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> ' <br /> Between June 26 and September 26, 2002, the groundwater surface dropped an average of 3 89 <br />' feet, the groundwater gradient decreased slightly from 0 0041 to 0 0034 foottfoot, and the <br /> groundwater flow direction shifted approximately 5 degrees to the northwest These groundwater <br /> flow and gradient characteristics are relatively consistent with previous calculations <br /> Based on the results of previous subsurface investigations, soil and groundwater beneath the <br />' north end of the former middle UST were impacted by relatively low concentrations of gasoline <br /> hydrocarbons Most of the petroleum hydrocarbon mass remains concentrated in soil immediately <br /> below the north end of the former middle UST Vertically, the concentrations of gasoline <br /> hydrocarbons decrease rapidly with depth, and are defined between 65 and 80 feet bgs <br /> Laterally, the extent of impacted soil appears to be defined to the area of the former USTs <br /> Groundwater sampled from the four monitoring welis and single water supply well has been free <br /> of detectable concentrations of gasoline compounds for the past four quarters As such, any <br /> remaining impacted groundwater is probably limited to the area directly beneath the former UST <br /> The monitoring well network appears to adequately define the plume of impacted groundwater <br /> Based on these conclusions, Ramage Environmental recommends that PHSIEHD and RWQCB <br /> consider the case for regulatory closure <br /> 11 <br /> 1 <br />