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s _ <br /> � i <br /> ` 4 <br /> noted at the 14 to 16 feet and 32 to 34 feet below <br /> grade <br /> intervals, respectively, with extraction volumes ranging <br /> from 14 to 17 cfm. The maximum capture radius recorded at <br /> the 28 to 30 feet below grade interval was 110 feet at <br /> volumetric flow rates of 16 to 24 cfm. Influence was noted <br /> i up to 110 and 147 feet between monitoring wells at <br /> _ extraction volumes ranging from 24 to 26 cfm. <br /> CONCLUSIONS <br /> _ The results of the Soil Gas Survey indicate that <br /> concentrations of hydrocarbon as vapor are located <br /> predominantly in the vicinity of the former tank cavity. <br /> Concentrations were recorded at depths greater. than 28 feet <br /> below grade in this area. The results. of the <br /> J . performance <br /> testing indicate that the soil, conditions at this seare <br /> j suitable for remediation by vacuum extraction. <br /> Based on an extrapolated average vapor concentration of <br /> I0,000 ppm wsth a flow rate of 100 cfm, <br /> approxamat ly <br /> pounds of petroleum .hydrocarbons �rould` be removed ,3�31y6 <br /> during.-the. ink tial <br /> ages.-,of--.of--operatic►n ` It is <br /> 1 estimated <br /> y <br /> that average soil hydrocarbon vapor concentration would <br /> decrease to less than 6,000 ppmwithzn several weeks.. i <br /> Removal_;-would,be ,,approximatel 96 <br /> Y pounds cif petroletin <br /> hydrocarbons ,per„^day at this„ time:. <br /> t .Wath Exxon's approval, a proposal for a soil remediation <br /> developed. <br /> `program that includes a site-specific system design will be <br /> , I <br /> _3 <br />