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A <br /> . HYDROCARBON-IMPACTED SOIL <br /> ' MASS VOLUME ASSUMPTIONS AND CALCULATIONS <br /> Volume of contaminated soil at 5-foot increments <br /> ' V = 7ri-2 -h -4 7r(55 ft2) - 5 ft = 47,515 ft3 1,760 yd <br /> Converting 1,760 yd'to cm3yieldsapproximately 1,343,851,421 cm3 Using 1 5 g/cm3 as the weight <br /> of soil, the total weight of contaminated soil is approximately 2,015,777,132 g <br /> A total of eight soil samples were detected at depths between 40 and 55-feet TPH-g was detected <br /> at 40 feet at a concentration of 240 mg/kg, at 45 feet at concentrations of 3 8, 5, 5 6, 24, 100, and <br /> 340 mg/kg, and at 55 feet at concentrations of 5 6 and 5 5 mg/kg <br /> 1) (3 5-feet through 40-feet) The average concentration yields approximately 120 ppm <br /> Using 120 parts per million as the average concentration of gasoline, the volume of gasoline is <br /> weight of soil - average concentration -4 2,015,777,122 g - 0 000120 = 241,893 g of gasoline <br /> g g <br /> Converting grams of gasoline to volume of gasoline (gallons) using density of gasoline to equal 0 8 <br /> 241,893 g of gasoline — 0 8cm3/g = 302,367 cm3 <br /> ' 302,367 cm3 - (I gallon —3,785 cm3) z 79.89 gallons of gasoline <br /> 2 40-feet through 45-feet) The average concentration yields approximately 159 85 ppm <br /> { g <br /> ' Using 159 85 parts per million as the average concentration of gasoline, the volume of gasoline is <br /> weight of soil - average concentration -4 2,015,777,122 g - 0 00015985 = 322,222 g of gasoline <br /> Converting grams of gasoline to volume of gasoline (gallons) using density of gasoline to equal 0 8 <br /> ' 322,222 g of gasoline — 0 8cm3/g = 402,777 5 cm3 <br /> 402,777 5 cm3 - (1 gallon—3,785 cm3) Z 106.41 gallons of gasoline <br />