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1 <br /> _ BENZENE MASS CALCULATIONS <br /> 7-Eleven Store No. 20304 <br /> IJuly, 1999 <br /> Sod Mass Calculation for benzene (Pounds) <br /> 1) Sod plume volume <br /> Area =45 feet x 70 feet-862 feet2(Excavated area (38 feet x 16 feet) + (18 feet diameter)] = 2,288 ftz <br /> Depth = 8 feet <br /> Volume=V= 18,304 ft' <br /> 2) Sod weight <br /> One cubic foot of soil weighs an average of 124 pounds <br /> 18,304 ft3 x 124=2,269,696 lbs <br /> ' 3) Soil benzene concentrations <br /> Assume average concentration of 0 05 mg/kg benzene based on the summary of analytical data <br /> Ws x C„= pounds hydrocarbons as benzene <br /> where Ws= Weight of soil plume, and <br /> C,,= ameraae concentraton in Darts per million (1 x 10� <br /> V2.269.696 lbs soil x 0.05 lbs benzene = 1 1 pounds of benzene <br /> 1,000,000 lbs benzene <br /> Dissolved Mass Calculation for benzene (Pounds) <br /> ' 1) Dissolved plume volume <br /> Width = 70 feet x 40 feet <br /> Depth = 15 feet <br /> Volume=V= 42,000 ft' <br /> 2) Soil porosity= 40 percent(0 40) <br /> 42,000 ft3 x 0 4= 16,800 ft3 <br /> 1 ft3 of water= 7 5 gallons=63 pounds of water <br /> 16.800 ft3 x 63 Ibs/ft3,x,10 lbs benzene. = 0 0002 pounds of benzene <br /> 1,000,000,000 lbs benzene <br /> 1 <br /> mascalb ex <br /> 1 _ <br />