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4 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> Between May 6 and August 22, 2002, the groundwater surface dropped an average of 1 88 feet, <br />' the groundwater flow direction shifted approximately 170 degrees to the west, and the gradient <br /> increased from 0 0012 to 0 0044 foot/foot Over the past four quarterly monitoring events, the <br /> groundwater flow direction has shifted from south to northwest to northeast to west These <br /> changes in the groundwater surface characteristics may be due to variations in seasonal <br /> groundwater recharge, influence from the municipal irrigation well, and/or distribution of free <br /> product on the groundwater table surface <br /> Between May 6 and August 22, 2002, free product reappeared in MW-1, the concentrations of <br /> gasoline compounds in MW-2 increased slightly, and the concentrations of gasoline compounds <br /> in MW-3 decreased to non-detectable In groundwater, gasoline hydrocarbons continue to be <br /> concentrated near former UST#3 Concentrations of gasoline compounds decrease with <br /> distance to the east and northeast of former UST#3 As shown on the isoconcentration map for <br /> MTBE in groundwater (Figure 4), the lateral extent of MTBE at the water table is undefined to the <br /> south, west and east of the former UST <br /> Based on these conclusions, Ramage Environmental recommends that a work plan be prepared <br /> to further investigate the extent of impacted soil and groundwater, and to initiate soil and <br /> groundwater remediation at the site Additionally, quarterly groundwater monitoring and sampling <br /> should continue The next monitoring event is scheduled for November 2002 <br /> ri <br /> r <br /> 6 <br />