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3.0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br />' Between December 19 2003 and March 24 2004 the groundwater surface rose an average of <br /> , 9 9 <br /> 1 59 feet, the groundwater flow direction shifted approximately 10 degrees toward the northeast, <br /> and the groundwater gradient decreased from 0 0020 to 0 0018 foot/foot The groundwater flow <br /> direction and gradient appear to be consistent with historical trends <br /> Between December 19 2003 and March 24 2004 the concentrations of gasoline compounds in <br /> , g p <br />' groundwater remained relatively stable Gasoline hydrocarbons are concentrated as free product <br /> near former UST#3, and concentrations of gasoline compounds decrease with distance from the <br /> source area As shown on the isoconcentration maps, the lateral extent of MTBE in groundwater <br /> is mostly defined (Figure 7), and the lateral extents of TPH-as-gasoline and benzene in <br /> groundwater remain undefined to the west of the source area (Figures 5 and 6) The vertical <br />' extent of impacted groundwater has not 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 /> 7 <br />