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l u t <br /> - l <br /> APPENDIX E CALCULATIONS <br /> • <br /> VOLUME AS <br /> ASSUMPTIONS AND <br /> i <br /> REMOVED HYDROCARBONS les recovered from he <br /> Based on the average hydrocarbon concentration of TPH-g In sot, same <br /> ilected from <br /> ! <br /> excavation <br /> s in the area of the excavation revious site assessments,the following calculation lfo�the removed petroleum hydrocarbonsas <br /> P <br /> ` been made <br /> IAssumptions <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 /> in impacted soil samples collected during excavation was estimated at 729 milligrams/kilogram <br /> Calculations <br /> 1,310 tons TPH-g-impacted soil x 21000 pounds/ton=2,620,000 pounds(lb)TPH-g-impacted soil <br /> 2,620,000 i <br /> i lb TPH-g-Impacted soil x 729 mg/kg TI H-g = 19131b gasoline <br /> 1913 lb gasoline- 6 251b/gal =306 gal gasoline <br /> Rr-MAINING HYDROCARBON-IMPACTED SOIL <br /> Based on the average hydrocarbon concentration of TPH-g to 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 esumatea the areal and vertical extent of <br /> petroleum hydrocarbon-impacted(PII)soil remaining in-place The volume ofPHI soil beneath he <br /> floor of the excavation can be approximated using the equation of a cone <br /> Vi = ,/3-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 /> Advanced GeoEnv,ronmcntal,inc <br />