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COMPUTATION SHEET <br /> t PROJECT TITLE ARCO Service Station 2076 PROJECT NO 20805-144 004 <br /> DESCRIPTION Mass of Petroleum Hydrocarbons in Soil SHEET 5 OF 5 <br /> PREP BY DATE CHKD BY DATE <br /> Mass of TPHG in the interval between 14and 20 feet below ground surface <br /> underlying the dispenser locations and extrapolated <br /> Mass of TPHG = Soil Vol Density Ib TPHG/lb soil <br /> (ft3) (pcf) <br /> 10,000 ppm contour line <br /> Mass TPHG = 0 100 001 <br /> Mass TPHG = 0 lbs within the 10,000 ppm contour line <br /> 1,000 ppm contour line <br /> Mass TPHG = 0 100 0 001 <br /> Mass TPHG = 00 lbs within the 1,000 ppm contour line <br /> 100 ppm contour line <br /> Mass TPHG = 5964 100 00001 <br /> • Mass TPHG = 596 lbs within the 100 ppm contour line <br /> 10 ppm isoconcentration line <br /> Mass TPHG = 3430 100 000001 <br /> Mass TPHG = 34 lbs within the 10 ppm contour line <br /> 1 ppm contour line <br /> Mass TPHG = 7252 100 0000001 <br /> Mass TPHG = 073 lbs within the 1 ppm contour line <br /> Total Mass TPHG = 64 lbs <br /> 10 to 20 ft underlying dispenser location <br /> Mass of TPHG in the interval between 20 and 35 feet below ground surface <br /> underlying the dispenser locations and extrapolated <br /> Mass of TPHG = Sod Vol Density Ib TPHG/lb soil <br /> (ft3) (pcf) <br /> 1 ppm contour line <br /> Mass TPHG = 14320 110 0000001 <br /> Mass TPHG = 158 lbs within the 1 ppm contour line <br /> Total Mass of TPHG in site sods between 2 and 35 feet below ground surface 734 pounds <br /> H, exceldat/arco/2076calc As <br />