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MASS CALCULATIONS <br /> 7-Eleven, Inc Facility No 17647 <br /> I, April 2002 <br /> I, <br /> Soil Mass Calculation for MTBE(Pounds) <br /> 1) Soil Plume Volume <br /> Wdth = 35 feet x 20 feet <br /> Depth = 16 feet <br /> Volume = 11,200 ft3 <br /> 2) Soil 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) Sod MTBE Concentrations <br /> ' Assume average concentration of 0 016 mg/kg MTBE based on analytical data <br /> WS x Cp,= pounds of MTBE <br /> Where WS=weight of soil plume, and <br /> CA=average concentration in parts per million (1 x106) <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 /> ' 17647022 doc <br />