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Estimate of TPH as gasoline mass remaining within 5 feet of boring SB-9, at a depth of <br /> 26 to 31 feet: <br /> Assume an average concentration of 200 ppm (= 200x10'6 Ibllb) TPH as gasoline <br />' (approximate average of 240 ppm at 26 feet and 180 ppm at 31 feet, see Table 1) in a <br /> cylinder of radius (r) 5 feet and length (1) 5 feet (from 26 to 31 feet deep) Assume the <br /> silty/sandy soil has an average bulk density of 110 lbslft3 <br /> Volume = -,cr'I = (3 14)(25)(5) = 393 ft-1 <br /> TPH as Gasoline Mass = (200x10-0 Ibllb)(110 lbslft3 )(393 ft'3 = 8 65 lbs <br /> Estimate of benzene mass remaining within 5 feet of boring SB-9, at a depth of 26 to 31 <br />' feet: <br /> Assume an average maximum concentration of 0 05 ppm (= 5x108 Ibllb) benzene (this <br /> represents the worst case, since no benzene was detected at detection limcts ranging <br /> ifrom 0 005 to 0 05 ppm) in a cylincer of radius (r) 5 feet and length (1) 5 fleet (from 26 to <br /> 31 feet deeps Assume the silty/sancy soil has an average bulk density of 110 lbs/ft3 <br /> Volume = ;rr`1 = (3 14)(25)(5) = 393 ft3 <br /> Benzene Mass = (5x10_" lb/lb)(110 lbslft3 )(393 ft3 ) = 0 0022 lbs <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> i <br />