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r COMPUTATION SHEET <br /> PROJECT TITLE: USA Service Station No. 65 PROJECT NO. 2007-0065-01 <br /> DESCRIPTION: Mass Emission rates SHEET 3 OF 4 <br /> PREP. BY: Kiran Na ara'u DATE: 11/2/2004 CHK BY: G. Kowtha DATE: <br /> CALCULATIONS <br /> Mass extraction rate is calculated based on the influent flow(field flow)and influent concentrations. Since the influent <br /> flow rate is measured on the negative side of the blower, the flow rate is corrected for pressure and temperature using the formula <br /> listed below <br /> Pressure corrected influent flow rate = Influent air flow rate acfm " {(406.8 "WC- "WC)/406.8"WC) <br /> Pressure corrected influent flow rate= 43.65 acfm ' ((406.8 "WC-34.2 "WC)/406.8"WC) = 42.19 <br /> Temperature Corrected influent flow rate Pressure corrected flow rate (460 R+ 68 F/(460 R + Influent temp°F)) <br /> Total Influent Flow Rate after pressure <br /> and temperature correction 42,19 scfm <br /> Mass extraction rates are calculated using the formula: <br /> scfm Conc in mg Ib 1440 min I m3 <br /> min m3 454000 mg day 35.3145 ft3 <br /> Calculation of mass extraction rate for influent TPHG=17,000 mg/m3 and flow rate=42.19 acfm j <br /> 42.19 ft3 17,000 mg Ib 1440 min m3 <br /> i <br /> min m3 454000 mg day 35.3145 ft3 <br /> = 64.42 lbs/day <br /> Calculation of mass extraction rate for influent benzene= 14 mg/m3 and flowrate=42.19 scfm <br /> 42.19 ft3 14 mg Ib 1440 min m3 <br /> min m3 454000 mg day 35.3145 ft3 <br /> = 0.053 lbs/day <br /> Calculation of mass extraction rate for influent MTBE_X10 mg/m3 and flowrate=42.19 acfm <br /> 42.19 ft3 10mg Ib 1440 min I m3 <br /> min m3 454000 mg day 35.3145 ft3 <br /> <0.038=--lbs/da- <br /> Source Test Calcs&summary—October 2004 <br />