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r <br /> MASS CALCULATIONS <br /> 16 <br /> 7-Eleven, Inc Facility No 17647 <br /> April 2002 <br /> 1 <br /> Soil Mass Calculation for MTBE (Pounds) <br /> ' 1) Sod Plume Volume <br /> ' Wdth =35 feet x 20 feet <br /> Depth = 16 feet <br /> Volume = 11,200 ft3 <br /> ' 2) Sod Weight <br /> One cubic foot of sod weighs an average of 124 pounds <br /> ' 11,200 ft3 x 124 = 1,388,800 lbs <br /> 3) Soil MTBE Concentrations <br /> Assume average concentration of 0 016 mg/kg MTBE based on analytical data <br /> WS x CA= pounds of MTBE <br /> Where WS=weight of sod plume, and <br /> CA= average concentration in parts per million (1x106) <br /> V 1,388, 800 lbs soil x 0 016 lbs MTBE =0 022 pounds of MTBE <br /> 1,000,000 lbs TPHg <br /> Dissolved Mass Calculations for MTBE (Pounds) <br /> 1) Dissolved Plume Volume <br /> ' Width = 50 feet x 40 feet <br /> Depth = 10 feet <br /> ' Volume =V =20,000 ft3 <br /> 2) Soil Porosity=40 percent (0 40) <br /> ' 20,000 ft3 x 0 4= 8,000 ft3 <br /> 1 ft3 of water=7 5 gallons =63 pounds water <br /> ' 3) Dissolved MTBE Concentrations <br /> Assume average concentration = 9 5 pg/L MTBE based on analytical data <br /> 8,000 ft3 x 63 lbs/ft3 x 9 5 lbs MTBE = 0 0048 pounds of MTBE <br /> 1,000,000,000 lbs benzene <br /> 17647023 doc <br />