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• II Estimated Mass of MTBE in Southern Tank Area Soil Plume <br /> Assumptions <br /> • Average area, thickness and concentration of MTBE inside the 0 1 mg/kg isoconcentration <br /> contour line are 242 ft, 10 feet and 0 21 mg/kg,respectively.Estimated volume of impacted <br /> soil already removed during UST removal is approximately 161 ft by 5 feet, or 805 ftp <br /> Average area,thickness and concentration of MTBE between the 0 1 mg/kg and 0 01 mg/kg <br /> isoconcentration contour lines are 1247 ft, 15 feet and 0 06 mg/kg, respectively Estimated <br /> volume of impacted soil already removed during UST removal is approximately 385 fl by <br /> 7 5 feet, or 2888 ft <br /> o Average weight of soil 56 625 kg/fO (per unit volume) <br /> Calculations <br /> 1) [242 ft2 X 10 ft - 805 fe]x 0 21 mg/kg x 56 625 kg/ft X 1kg/1 0x106 mg= 0 019 kg <br /> 2) [(1247 ft' x 15 ft - 2888 W) - (242 ft' x 10 ft- 805 fe)] x 0 06 mg/kg x 56 625 kg/ft' <br /> x lkg/1 0x106 mg= 0 048 kg <br /> Estimated mass of MTBE in the southern tank area plume= 0 07 kg or 0 15 lbs <br /> Estimated Mass of Total MTBE in Soil = 0.20 kg or 0.44 lbs <br /> I <br />' Advanced GecEnvironmentai,Inc <br />