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• <br /> Appendix A Calculations of Estimates of Fuel in Soil Before and After Excavation <br /> This estimate was made from the areas shown on Figure 1 and the estimates from field <br /> observations regarding the extent and distribution of contaminants and the chemical data <br /> collected in sod samples from this excavation and selected previous sod boring data <br /> Total Excavated Soil - Estimate of contaminants present before excavation <br /> "Heavy" Concentrations - 686 ft2 x 13ft = 330 cubic yards <br /> "Light" Concentrations - 173 ft2 x 13ft = 83 cubic yards, where <br /> 330 yards comprised of - 60% "heavy" concentrations, <br /> - 25% "light" concentrations, <br /> - 15% clean, (i a overburden or uncontaminated) <br /> 83 yards comprised of 100% "light" concentrations <br /> Definition, of "heavy" and"I i g h t" concentrations are as follows, <br /> . Fuel as Total Petroleum Hydrocarbons as Gasoline, TPHG, in parts per million (ppm) <br /> 30 yards assumed of very heavy Cad 10,000 ppm TPHG <br /> 170 yards assumed heavy concentrations @ 1,800 ppm TPHG <br /> 165 yards assumed of light concentrations 0 200 ppm TPHG, hence <br /> Yards ppm _ pounds-F-uel pounds Benzene* <br /> 30 10,000 900 1 8 <br /> 170 1,800 918 1 8 <br /> 165 200 99 0 2 <br /> TOTALS 1917 38 <br /> After Excavation <br /> Total Yards - 686ft2 x 2ft = 51 yards remaining (as shown on Figure 1 cross sections) <br /> by using 400 ppm TPHG as highest residual concentration, so <br /> Yards Ppm 12oUnds ,fuel pounds Benzene* <br /> 51 400 61 012 <br /> based-an-highest gasoline ratio of 1/500 <br /> V <br /> � 3 <br /> �. Page 6 <br />