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HYDROCARBON-IMPACTED SOIL <br /> t VOLUME ASSUMPTIONS AND CALCULATIONS <br /> An estimate of the areal extent ofimp acted soil surrounding the former UST area is made from <br /> samples collected from boring B2, B3, B4 and wells MW and MW4. <br /> Based on the lateral distribution of sampling points found to contain detectible concentrations of <br /> petroleum 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 /> E bsg with the most impacted soil occurring between 3 feet and 8 feet bsg. <br /> Impacted Soil Between 8 feet and,10 feet bsg: <br /> TPII-. <br /> Volume of impacted soil: 5,100'ft'x 2 ft — 10,200 ft' -27 ft3 /yd3 = 378 yd3 or 2.9 x 108 cm3 <br /> Mass of impacted soil: 2.9 x 108 cm3 • 0.0015 kg/cm3=4.3 x 105 kg <br /> Average concentration: 92 mg/kg <br /> Density of TPH-g: 0.75 g/cm3 <br /> Mass of TPH-g in soil: 4.3 x 105 kg x 92 mg/kg= 4.0 x 10'mg=4.0 x 104 g <br /> Volume of TPH-g in soil: 4.0 x 10' g _ 0.75 g/cm3 = 5.3 x 10' cm3 • (1 gallon_3,785 cm3) <br /> 14 gallons of gasoline <br /> TPH-d: <br /> TPH-d was not detected in soil samples collected below 8 feet bsg. <br /> J ; <br /> I <br /> 1 <br /> II ,I <br /> u <br /> 1 <br /> i <br /> it <br /> { I <br /> i <br />