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w <br /> 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 lb/lb) TPH as gasoline 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 = nrzl = (3 14)(25)(5) = 393 ft3 <br /> Hydrocarbon Mass = (200x10-6 Ibllb)(110 Ibslft3 )(393 ft' ) = 8 6 lbs <br /> r <br /> r <br />