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3 � <br /> APPENDIX D <br /> l! Page 2 of 2 <br /> RESIDUAL HYDROCARBON-IMPACTED SOIL <br />' Based on the average hydrocarbon concentration of TPH-g in soil samples recovered from the side- <br /> walls and floor of the excavation area and soil samples collected from soil borings in the area of the <br /> excavation'during previous site assessments, AGE estimated the areal and vertical extent of <br />' petroleum hydrocarbon-impacted(PHI)soil remaining in-place The volume of PHI soil beneath the <br /> floor of the excavation can be approximated using the equation of a cone <br />' volume (V) =0 2618-d2-h <br /> Where d = diameter <br /> h =height <br />' The weight wt of PHI soil can be calculated b <br /> � ( ) Y <br />' wt gasoline= 57 kilograms (kg)/ft'-V-C <br /> Where kg/ft3 =kilograms per cubic foot <br />'Or C = concentration of gasoline(TPH-g) in soil In milligrams per <br /> kg (mg/kg) <br />' - The following calculations for the remaining petroleum hydrocarbon-impacted soil were made <br />' Diameter of impacted soil beneath excavation=22 ft <br /> Height of impacted soil beneath excavation= 33 ft <br /> Volume of PHI soil = 4,181 ft' <br />' Average concentration of TPH-g= 9 9 mg/kg <br /> Weight of gasoline in Area A = 4 3'kg TPH-g=9 5 lb TPH-g <br /> Sample Calculation <br />' wt gasoline= 57 kg/ft'-V-C ` <br /> = 57 kg/ft'-(O 2618-d2-h)-C <br /> ' = 57 kg/ft3-(4,181 1$)-9 9 mg/kg <br />' a = 2.4 kg`= 5.2 lb TPH-g <br /> Advanced GeoEnvi ron mental,Inc <br /> 1 <br />