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JAN-13-1994 68 55 FROM TO 12094640138 P 06 <br /> Esawle of l'pH as gtlsob W rmss rernak" wown s feet of boring SBS, at a depth of <br /> 26 to 31 feet <br /> Assume an average concentration of 200 ppm (= 20Ox1DQ IbAb) TPH as gasoline <br /> (approximate average of 240 ppm at 26 feet and ISO ppm at 31 feet, sae Table 1) in a <br /> cylinder of radius (r) 5 feet and length (l) 5 feet (fram 26 to 31 feet deep). Assume the <br /> silty/sandy soil has an average bulk density c f 110 IbsW <br /> Volume = icr� = (3 14)(25)(5) = 393 f <br /> TPH as Gasoline Mass = (200x1( ' Ibllb)(110 lbsJW ){393 W = 8 65 lbs_ <br /> Esdmte of benzene mass renmhll V wiNtin 5 feet of boring W-9,at a depul of 26 W 31 <br /> feet <br /> Assume an average maximum concen#ration of 0 05 ppm (= 5x101 lbAb) benzene (this <br /> represents the worst case, since no benzene was detected at detection limits ranging <br /> from 0 005 to 0 05 ppm) in a cylinder of radlus (r) 5 feet and length (1) 5 feet (from 26 to <br /> 31 feet deep) Assume the silty/sandy scall has an average bulk denstty of 110 lbstre <br /> Volume = nel = (3.14)(25)(5) = 393 ftp <br /> Benzene mass = (5x10 ibilb)(110 IbsW )(393 it) = 0.0022 leas <br /> • <br />