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Mr. Hal Miller vUN 1 ;; 1989 <br /> ~� June B, 1989 <br /> Page 7 <br /> wells 14, 5 and 8 (See attached Figures 3, 4 and 5) . <br /> These data show that both upgradient and downgradient <br /> dissolved hydrocarbon levels receded concurrently as <br /> water levels dropped below the level of significant <br /> soil contamination. This is not the plume response <br /> that would ' e expected from monitoring the travel of a <br /> dissolved plume as it moved off site. <br /> o Groundwater pumping at the site from several pumping <br /> wells has been insufficient: in totally controlling <br /> groundwater flow across the site due to low <br /> permeabilities and a highly discontinuous subsurface. <br /> However, groundwater pumping has enabled the recovery <br /> of 900* gallons of free product. <br /> FUTURE PROJECT SCOPE ` <br /> Based on the conclusions presented, GTI has been attempting to <br /> iiaplement the following work steps. <br /> o Reduction of the monitoring and domestic well sampling <br /> schedule. <br /> o Exp-.nsion of the existing soil vapor extraction system <br /> to include four deeper extraction points. Timely <br /> implementation of this step is essential to take <br /> advantage of the low water levels and influence <br /> contaminated soils at depth removing the source for <br /> dissolved hydrocarbons. <br /> o Drill additional nested monitoring wells on and off- <br /> site to further define the lateral and vertical extent <br /> of dissolved hydrocarbons and to provide valuable <br /> information on soil perm-abilities at different levels. <br /> GROUNDWATER <br /> TECHNOLOGY,KC. <br />