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�t <br /> u <br /> 3 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> �l <br /> Between March 24, and June 9, 2004, the groundwater surface rose an average of 0 06 feet, the <br /> groundwater flow direction shifted approximately 10 degrees toward the east, and the <br /> groundwater gradient increased from 0 0018 to 0 0020 foot/foot The groundwater flow direction <br /> and gradient appear to be consistent with historical trends <br /> Between March 24, and June 9, 2004, the concentrations of gasoline compounds in groundwater <br /> decreased in MW-2 and MW-6, and remained relatively constant in MW-4 Gasoline <br /> hydrocarbons are concentrated as free product near former UST#3, and concentrations of <br /> gasoline compounds decrease with distance from the source area As shown on the <br /> isoconcentration maps, the lateral extent of MTBE in groundwater is mostly defined (Figure 7), <br /> and the lateral extents of TPH-as-gasoline and benzene in groundwater remain undefined to the <br /> west of the source area (Figures 5 and 6) The vertical extent of impacted groundwater has not <br /> J. been investigated <br /> Based on these conclusions, Ramage Environmental recommends that the previously-approved <br /> remedial feasibility testing tasks be initiated as soon as funding is available The first task should <br /> be the installation of the nested soil vapor extraction well and nested air sparge/soil vapor <br /> extraction well During this drilling work, another groundwater monitoring well should be installed <br /> to the west of MW-6,to further define the lateral extent of impacted groundwater In the <br /> meantime, monthly free product removal and quarterly groundwater monitoring should continue <br /> �1 <br /> a <br /> • 7 <br />