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} APPENDIX D Adsorbed Mass-Volume Calculations - Post Remediation AGE-NC-Project No. 97-0343 Page 2 of 3 . . • Approximate volume of soil in the frustum cone area: i Volume Vfu,,,,m 7,683.03 fe (see Figure 4; outer cone) • Using 176 mg/kg as the average concentration of gasoline in the frustum cone, the weight of gasoline is: , V, • typical weight of soil • average concentration of contaminant -1� 7,683.03 ft' • 125 lbs/ft • 0.000176 -4 169 lbs of gasoline or 27 gallons of gasoline • This represents a 93% reduction in total TPH-g mass in soil utilizirig the mass calculation of TPH-g in soil calculated prior to remediation (2,388 lbs of gasoline; presented in AGE- prepared Interim Corrective Action Plan dated 20 January 2005). e Remaining Diesel: Two zones (outer and inner) were utilized in determining the remaining adsorbed total petroleum hydrocarbons quantified as diesel(TPH-d).The outer TPH-d zone contained concentrations less than 3,000 mg/kg and the volume was determined by subtracting the inner TPH-d zone(the inner frustum y the outer frustum cone volume. Concentrations of cone volume plus the inner wedge volume) from TPH-d reported in SVE confirmation boring P-1 between the depths of-10 feet and 15 feet bsg and 30 feet and 35 feet bsg were used to determine average TPH-d concentration within the outer TPH-d zone (for 35 feet bsg, data from wells/borings MW-1, MW-9 and B-3 were used). The inner TPH-d zone (concentrations more than 3,000 mg/kg)volume was determined by adding the inner frustum cone volume plus the inner wedge volume. Concentrations of TPH-d reported in confirmation boring P-1 at depths of 20 feet and 25 feet bsg were used to determine the average TPH-d concentration within.the inner TPH-d zone. Additionally, at depths where the P-1 soil samples contained concentrations higher than pre- remediation data(e.g.,20 feet and 25 feetbsg)analytical data from wells/borings MW-1,MW-9 and B-5 were incorporated into the average TPH-d concentration. t Outer TPH-d Zone Mass-Volume • Approximate volume of soil in the outer TPH-d zone(outer frustum cone volume subtracted by the sum of the inner frustum cone and wedge volumes): Advanced GeoEnvironmental,Inc.