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US .i.. <br /> HYDROCARBON-IMPACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> An estimate of the areal extent of unpacted soil surrounding the former UST area is made from <br /> samples collected from boring B2, B3, B4 and wells MWl and MW4. <br /> Based on the lateral distribution of sampling points found to contain detectible concentrations of <br /> npetroleum hydrocarbons, AGE assumes the hydrocarbon-impacted soil plume to be approximately <br /> 5,100 square feet. The vertical distribution of impacted soil appears to be between 5 feet and 12 feet <br /> bsg with the most impacted soil occurring between 3 feet and 8 feet bsg. <br /> Impacted Soil Between 10 feet and 12 feet bsg: <br /> TPH-g <br /> __- <br />'y TPH-g was not detected in soil amples collected below 9 feet bsg. <br /> i <br /> TPH-d: <br /> TPH-d was not detected in soil samples collected below 8 feet bsg. <br /> 1 <br /> i <br /> I <br /> j <br /> 1 <br /> i <br /> .I <br /> T AI <br /> I <br /> .i <br /> i <br /> I <br /> k !I <br />{ <br />