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r r c r r r r r r rr r r r r r r r r <br /> APPENDIX C <br /> ESTIMATION OF RESIDUAL HYDROCARBON MASS IN SOIL <br /> FORMER MOBIL TRACY BULK PLANT 04-343 <br /> CONCENTRATIONS (PPM <br /> 5,000 1,000 1,000a 100 <br /> SYMBOLS AND DESCRIPTIONS UNITS VALUE VALUE VALUE VALUE NOTES <br /> A = Area of hydrocarbon-affected soil square feet 2272 6643 2003 17164 1 f <br /> T = Thickness of hydrocarbon-affected soil feet 2 2 3* 2 2 4 <br /> Vsoil = Volume of hydrocarbon-affected soil cubic yard 168 492 222 1271 <br /> BI] = Bulk density of soil kg/cu. yard 1166 1166 1166 1166 3 <br /> SM = Total mass of hydrocarbon-affected soil kg 195888 573672 258852 1481986 <br /> TPH = Concentration of TPH in soil mg/kg soil 5000 1000 1000 100 4 <br /> MG Mass of diesel mg 9.79E+08 5.74E+08 2.59E+08 1.48E-1-08 <br /> kg 9.79E+02 5.74E+02 2.59E- 02 1.48E+02 <br /> CF = Conversion factor (density of 0.8 kg/liter) gallons/kg 0.33 0.33 0.33 0.33 <br /> Vhydrocarbon= Total volume of diesel in soil gallons 323 189 85 49 <br /> ESTIMATED GALLONS OF HYDROCARBONS REMAINING IN SOIL: 647 <br /> l <br /> EQUATIONS <br /> NOTES <br /> Vsoil = A * T 1. Refer to Figure 5 for area of residual hydrocarbons in soil. <br /> SM = BD * V 2. Assumes impacted soil exists from approximately 10.5 to 12.5 fbg(below groundwater). <br /> MG = TPH * SM 3. Based on dry soil density of 95 lblcf(site specific average). <br /> Vol hydrocarbon = CF * MG 4. Based on 1994/1995 soil boring TPH-D concentrations and best concentration estimates. <br /> a. Hydrocarbons in soil above groundwater. <br /> * Assumes impacted soil exists from approximately 7.5 to 10.5 fbg(above groundwater). <br />