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L : �00 14 L HYDROCARBON-IMPACTED SOIL VOLUME ASSUMPTIONS AND CALCULATIONS Volume of contaminated soil at 5 feet bsg to 11 feet bsg: V,= =2 •h ->t 7r(7.5 ft2) • 6 ft = 1,944 ft' # 39 yd' Volume of excavated contaminated soil: LV,=w• I-h-! 10ft • 10ft • 5ft = 500 ft' - 18.5 yd' Volume of remaining contaminated soil: LV1 = V.- V.-1 39 yd' - 18.5 yd' - 20.5 yd' LConverting 20.5 yd'to cm'yields approximately 15,652,815 cm'. Using 1.5 g/cm'as the weight of soil, the total weight of contaminated soil is approximately 23,479,222 g. LAt approximately 5 feet bsg, soil samples collected at the sidewalls had concentrations of 3500, 2700, 990, and 3,300 ppm,yielding an average concentration of 2623 ppm. At approximately 11 feet bsg, L a soil sample collected from the bottom of the excavation had a concentration of 770 ppm. The average concentration between 2623 ppm and 770 ppm yields 1696 ppm. L Using 1,696 parts per million as the"average" concentration of gasoline from 5 feet bsg to 11 feet bsg, the volume of gasoline is: Lweight of soil • average concentration 23,479,222 g • 0.001696= 39,820 g of gasoline Converting grams of gasoline to volume of gasoline(gallons)using density of gasoline to equal 0.8: 39,820 g of gasoline_0.8cm'/g= 49,775 cm' L49,775 cm' • (1 gallon=3,785 cm) - 13.15 gallons of gasoline 2) Volume of contaminated soil at 11 feet bsg to 15 feet bsg: V2= nr'•h -1 rr(7.5 ft) • 4 ft - 707 ft' - 26 yd' LConverting 26 yd'to cm'yields approximately 19,989,743 cm'. Using 1.5 g/cm' as the weight of soil, the total weight of contaminated soil is approximately 29,984,615 g. LAt approximately 11 feet bsg, a soil sample collected from the bottom of the excavation had a concentration of 770 ppm. At approximately 15 feet bsg, a soil sample collected from soil probing PI had a concentration of< 1 ppm. The average concentration between 770 ppm and<1 ppm yields 1 approximately 385 ppm. 1. L