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i <br /> e <br /> 1 <br /> t <br /> ATTACHMENT 3 <br /> I <br /> Calculations Used To Derive The Revised Estimate Of Hydrocarbon Mass <br /> Remaining In Soil <br /> Estimated mass of TPHG remaining in soil= (estimated mass of soil) x(concentration of TPHG) <br /> where, <br /> estimated mass of soil = (estimated soil bulk volume) x (soil bulk density) <br /> estimated soil bulk volume = (areal extent of TPHG) x(vertical extent of TPHG) <br /> i <br /> therefore, <br /> estimated soil bulk volume = (4,550.0 sq. ft.)* x (5.0 ft.) = 22,750.0 cu. ft. <br /> estimated mass of soil = (22,750.0 cu. ft.) x (38.23 kg/cu. ft.)** = 869,732.0 kg <br /> finally, <br /> estimated mass of TPHG remaining in soil = (869,732.0 kg) x (6.0 mg/kg)# <br /> = 5,218,392.0 mg <br /> = 11,5 lbs. <br /> * measured from area shown on Attach. 2 <br /> ** converted from published mean soil bulk density= 1.35 glcc <br /> # concentration units equivalent to parts per million (ppm) <br />