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I <br />' APPENDIX E <br /> VOLUME/MASS ASSUMPTIONS AND CALCULATIONS <br /> I <br /> IREMOVED HYDROCARBONS <br /> Based on the average hydrocarbon concentration of TPH-g In soil samples recovered from the <br /> excavation area and soil samples collected from soil borings in the area of the excavation during <br /> previous site assessments, the following calculation for the removed petroleum hydrocarbons has <br /> been made <br /> I <br /> Assumptions <br /> A total of 1,310 tons of impacted soil was excavated and transported off-site for disposal, landfill <br /> weight tags were used to determine the mass of soil removed The average concentration of TPH-g <br /> Iin Impacted soil samples collected during excavation was estimated at 729 milligrams/kilogram <br /> Calculations <br /> I1,310 tons TPH-g-impacted soil x 2,000 pounds/ton=2,620,000 pounds (lb) TPH- -Im acted soil <br /> 10 2,620,000 lb TPH-g-Impacted soil x 729 mg/kg TPH-g = 1913 lb gasoline L/ <br /> 1913 lb gasoline-- 6 25 lb/gal = 306 gal gasoline <br /> IREMAINING 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 sail samples collected from soil borings In the area of the <br /> I 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 /> Ifloor of the excavation can be approximated using the equation of a cone <br /> V, = v3-A-h <br /> Where A = Area <br /> h= height <br /> The volume of PHI soil remaining southeast of the southeast wall of the excavation can be <br /> approximated using the equation of a half-ellipsoid <br /> ` V, =3/3•n•a•b+c <br /> I <br /> Advanced GeoEnvironmental,Inc <br />