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DEC-29-1993 16.02 FROM TO 12094640138 P 06 <br /> EsUmN of TPH as gasollm maw mmabbg v+ i 5 feet of boring SS-9, at a depM of <br /> Zs to 31 feet" <br /> Assume an average concentration of 200 ppm (= 200xitf° IbAb) TRH as gasoline <br /> (approximate avem9e of 240 ppm at 26 feet and W ppm at 31 feet. we Table 1) in a <br /> cylinder of radius (r) 5 %et and length (1) 5 fleet (from 28 to 31 feet deep)- Assume the <br /> scltyleandy sod has an average buk densctyt of 110 Ibse <br /> Volume = w2l = (3 14)(20(5) = 393 fe. <br /> TPH as GaEsoCme Mass - (200x10' ' Ili/lb)(110 lbslft')(393 ftp) = 8.65 Ili <br /> lF.W=te of berwene mass r+emehing vdfi in 5 feet of bw&W S", at a depth of 26 to 31 <br /> feet" <br /> Assume an average maximum concentration of 0 05 ppm (= 5x10"0 Ibllb) benzene (this <br /> represents the worst case, since no benzene was detected at detection Emits ranging <br /> from a 005 to 0 05 ppm) in a cylinder of redus(r) 5 feet and length (l) 5 fleet(from 28 to <br /> 31 feet deep) Assume the scttyfsandy ml has an average bulk density ref 110 IbW <br /> Volume = al T (3 14)(25)(5) = 393 W <br />• Benzene mass = (Sxj0u Dao)(110 lb ► )(393 ft3) = 0.0022 We <br />