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(JI <br /> I n <br /> HYDROCARBON-IMPACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> An estimate of the areal extent of impacted soil surrounding the former UST area is made from <br /> samples collected from boring B2, B3, B4 and wells MW 1 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 3 feet and 12 feet <br /> bsg with the most impacted soil occurring between 3 feet and 8 feet bsg. <br /> Total Volume of Impacted Soil: <br /> i <br /> Volume of impacted soil: 5,100 ft2 x 9 ft=45,900 ft'-27 ft'/yd = 1,700 yd3 or 1.3 x 109 cm3 <br /> Mass of impacted soil: 1.3 x 109 ca • 0.0015 kg/cm3 = 1.9 x 106 kg <br /> Mass of TPH-g in soil: Mass of TPH-g between 3 feet and 8 feet bsg +mass of TPH-g <br /> between 8 feet and 10 feet = 1.73 x 106 g + 0.004 x 106 g = <br /> 1.9 x 106 g gasoline <br /> Volume of TPH-g in soil: Volume of TPH-g between 3 feet and 8 feet bsg+mass of TPH-g <br /> between 8 feet and 10 feet = 610 gallons + 14 gallons = <br /> 624 gallons gasoline <br /> TPH-d: I <br /> Volume of impacted soil: 5,100 ft2 x 12 ft= 61,200 ft3 - 27 ft3/yd3 =21270 yd' or 1.73 x 109 <br /> cm3 <br /> Mass of impacted soil: 1.73 x'!109 cm3 • 0.00 15 kg/cm3 = 2.6 x 106 kg j <br /> i <br /> Mass of TPH-d in soil: Mass of TPH-d between 3 feet and 8 feet bsg=3.90 x 105 g gasoline <br /> Volume of TPH-d in soil: Volume of TPH-d between 3 feet and 8 feet bsg = <br /> 123 gallons gasoline <br /> I <br /> I <br /> i <br />