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CALCULATION OF REMOVAL EFFICIENCY FOR HYDROCARBONS IN SOIL <br /> H drocartson5in_Soil.Prior to Site Remediation <br /> Assumptions: Impacted soil column 25 ft. wide, 25 ft. long, 35 ft. deep (21,875 cubic f=t.) <br /> Bulk density of soil = 120 lbs/cubic ft_ <br /> Average hydrocarbon concentration in soil column = 1,000 mg/kg <br /> Bulk density of hydrocarbons = 6.1 lbs/gal <br /> Calculations: (21,875 cubic ft.) X (120 lbs./cubic ft.) = 2,625,000 lbs. impacted soil <br /> (2,625,000 lbs) X (0.45 kg/lb) = 1,181,250 kg impacted soil <br /> (1,181,250 kg) X (1,000 mg/kg) = 1,181,250,000 mg of hydrocarbons in soil <br /> (1,181,250,000 mg) X (0.0000022 lbs/mg) = 2,600 lbs of hydrocarbons in soil <br /> (2,600 lbs) / (6.1 lbs/gal) = 426 gal hydrocarbons in soil prior to remediation <br /> Hydrocarbons Remaining in Soil <br /> Assumptions: Impacted soil column 10 ft. wide, 10 ft. long, 5 ft. deep (500 cubic ft.) <br /> Bulk density of soil = 120 lbs/cubic ft. <br /> Average hydrocarbon concentration in soil column = 0.9 mg/kg (samples from <br /> bottom of tank pit were all Iess than laboratory detection limit of 1.0 mgikg) <br /> Bulk density of hydrocarbons = 6.1 lbs/gal <br /> 12 <br /> Calculations: (500 cubic ft.) X (120 lbs/cubic ft.) = 60,000 lbs impacted soil <br /> (60,000 lbs) X (0.45 kg/lb) = 27,000 kg impacted soil <br /> (27,000 kg) X (0.9 mg/kg) = 24,300 mg of hydrocarbons in soil <br /> (24,300 mg) X (0.0000022 lbs/mg) = 0.05 lbs of hydrocarbons in soil <br /> (0.05 lbs) / (6.1 lbs/gal) = 0.008 gal hydrocarbons remaining in soil <br /> Removal Effciencv = 425.992 pal / 426 gal X 100 > 99.9% <br /> RPT139.SIS <br />