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S <br /> a 1 <br />/ r <br />' APPENDIX D <br /> VOLUME/MASS ASSUMPTIONS AND CALCULATIONS <br />' REMOVED 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 <br /> uringprevious site assessments, the following calculation for the removed petroleum hydrocarbons has <br />' been made <br /> Assumptions _ <br /> A total of 4$5 8 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 1021 milligrams/kilogram <br /> AVERAGE CONCENTRATION <br /> Sample ID Concentration (mg/kjz) <br />' EWl- 10' 920 <br /> EW 1-20' 4,400 <br /> SP-01,02,03,04' 13 <br />' • SP-05,06,07,08 13 <br /> SP-09,10,11,12 10 <br /> SP-(3,14,15,16 11 <br />' SP-17,18,19,20 13 <br /> SP-01 3,300 <br /> SP-05 110 <br />' SP-09 180 <br /> SP-13 3,200 <br /> SP-17 86 - <br />' Average Conc. 1,021 mg/kg <br /> Calculations <br /> 485 8 tons TPH- -im acted soil x 2,000 ouwnds/ton= 971,600 pounds (lbs) TPH-g-impacted soil <br /> } <br />' 971,600 lbs TPH-g-impacted soil /2 2046 lb/kg = 440,710 kilograms (kg) TPH-g'impacted soil <br />' 440,710 kilograms (kg) TPH-g-Impacted soil x 0 001021 unit-less (1,021 mg/kg TPH-g) <br /> = 449.9 kg gasoline = (2 2046 lblkg) = 992 lbs gasoline <br />' 99 2 lbs gasoline — 6 25 lbs/gallon (gal) = 159 gal gasoline <br /> • Advanced GeaEnvironmental,Inc <br />