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rR <br /> I Estimate Max Extraction Rate <br /> IAnalytical from vent test <br /> Well Benzene TPHa Benzene % of TPH <br /> VEW-1 310 12,000 2 58 <br /> VEW-2 500 17,000 294 <br /> AVG = 2 76% <br /> To be conservative, use LEL as maximum concentration <br /> I 12% % 106 parts <br /> LEL = = 12,000 <br /> 100 per million <br /> Use molecular weight of hexane = 86 glmole <br /> Assume Ideal gas law Is valid <br /> 1 mole of soil vapor = 22 4 liters (Q) <br /> 12,000 E-6 mole 86 g 1,000 mg 1,000 P <br /> = 46,071 <br /> 22 4 Q mole g m3 or 46 000 mg/M3 <br /> Benzene = 2 76% (46,000) = 1270 mg/m3 <br /> Assume extraction flow rate = 250 scfm <br /> 250 ft3 46,000 mg 0 0283 m3 lb 1,440 min <br /> TPHg = 1,033 ' <br />' min m3 ft3 453 6E3 mg day or 1,000 Ib/day <br />' 250 ft3 1,270 mg 0 0283 m3 Ib 1,440 min <br /> = 28 5 lb/day <br /> Benzene <br /> min m3 ft3 453 6E3 mg day <br /> 91 1144A OAT <br /> If <br />