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' CALCULATION OF REMOVAL EFFICIENCY FOR HYDROCARBONS <br /> IN GROUND WATER <br /> Hydrocarbons in Ground Water_Prior_to Site Remediation <br /> Assumptions: Impacted aquifer area 120 ft. in diameter, 10 ft. deep (113,137 cubic ft.) <br /> Aquifer porosity = 0.3 (sand and silty sand) <br />' Average hydrocarbon concentration in ground water = 300 j.g/L <br /> Bulk density of hydrocarbons = 6.1 lbs/gal <br />' Calculations: (113,137 cubic ft.) X (0.3) = 33,941 cubic ft. impacted ground water <br />' (33,941 cubic ft.) X (28.32 L/cubic ft.) = 961,209 L impacted ground water <br /> (961,209 L) X (300 µg/L) = 288,362,700 µg = 288.4 g of hydrocarbons in ground <br />' water <br /> (288.4 g) X (0.0022 lbs./g) = 0.6 lbs. of hydrocarbons in ground water <br />' (0.6 lbs.) / (6.1 lbs./gallon) = 0.1 gallons hydrocarbons in ground water prior to <br /> remediation <br />�} <br /> Hydrocarbons Remaining in Ground_Water <br />' Assumptions: Impacted aquifer area 40 ft. in diameter, 5 ft. deep (6,283 cubic ft.) <br />' Aquifer porosity = 0.3 (sand and silty sand) <br /> Average hydrocarbon concentration in ground water = 49 µg/L (samples from <br /> monitoring wells have all been less than laboratory detection limit of 50 µg/L) <br />' Bulk density of hydrocarbons = 6.1 lbs/gal <br /> Calculations: (6,283 cubic ft.) X (0.3) = 1,885 cubic ft. impacted ground water <br /> (1,885 cubic ft.) X (28.32 Llcubic ft.) = 53,383 L impacted ground water <br />' (53,383 L) X (49 µg/L) = 2,615,767 µg = 2.62 g of hydrocarbons in ground water <br />' (2.62 g) X (0.0022 lbs./g) = 0.006 lbs. of hydrocarbons in ground water <br /> (0.006 lbs.) / (6.1 lbs./gallon) = 0.0009 gallons hydrocarbons remaining in ground <br />' water. <br /> Removal Efficiency = ((0.9991_gal]_/_(0.1 gall X 100 99.9% <br /> 1tPT139.SIS <br />