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AUX <br /> 7-Eleven/Stockton 22 <br /> August 1989 <br /> minute (scfm) , a 15-foot radius of influence can be achieved. <br /> The total nonmethane hydrocarbon concentrations in the air being <br /> drawn from MW-1 was 15,000 parts per million by volume (ppmv) . <br /> These data suggest that existing monitoring wells would serve as <br /> efficient soil vapor-extraction points in an expanded soil-vent <br /> system. <br /> SUMMARY <br /> Groundwater monitoring data have documented a decline of the <br /> water table elevation by approximately 2.5 feet during this <br /> reporting period. Monitoring wells MW-2 and MW-3 remain dry. An <br /> insufficient volume of groundwater in MW-4 made it not feasible <br /> to obtain samples for laboratory analyses. During this reporting <br /> period the groundwater gradient has shifted slightly northward, <br /> but remains in an easterly direction except in the areas within <br /> the capture zones of pumping wells. The gradient increased from <br /> _ 0.002 ft/ft to 0.005 ft/ft during the three months period. <br /> The results of the groundwn}er sampling indicate that the <br /> ~ distribution of dissolved hydrocarbons in the groundwater beneath <br /> the site continues to be concentrated near the former <br /> underground-tank and pump-.island locations, which is unchanged <br /> since previous reporting. The surrounding domestic wells did not <br /> - contain detectable levels of dissolved hydrocarbons during this <br /> reporting period. <br /> The decline in groundwater levels resulted in the loss of <br /> PW-1 to the groundwater recovery system. Therefore, the WTDP was <br /> removed from that well. As a result, the total pumping rate of <br /> the groundwater recovery system was reduced from 1.6 gpm to <br /> approximately 1.0 gpm. <br /> �- r� <br /> . - - L l�Hul?11ti t11'.k <br /> j <br /> i <br />