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:b <br /> Granular activated carbon is proposed as a replacement control when the catalytic oxidizer <br /> is removed from the site: <br /> 4. EXPECTED EMISSION OF AIR CONTAMINANTS <br /> The following are calculations of the expected air emissions based on data from a pilot <br /> test. Pilot test data is included in Attachment B. <br /> The test data show total petroleum hydrocarbons as gasoline (TPHg) vapor concentrations <br /> of: <br /> VEW-1 12,000 (mg/m3) <br /> VEW-2 : 17;000 (mg/m3) <br /> We will use the average of the two tests for calculations, thus: <br /> TPHg concentrations into unit = (1.2,000 + 17,000)12 = 14,500 (mg/m3) <br /> Using a flow rate of 150 standard cubic feet per minute (scfm) and 24 hour. per day <br /> operation: <br /> TPHg mass rate into unit = 14,500 (mg/m3) x 150 (ft3/min) <br /> x .02832(ft3/m3) x 1440 (min/day) x .001 (g/mg) x .00221 (lbs/g) <br /> TPHg mass rate into unit 196 (lbs/day) <br /> 3 <br /> 1 <br /> Using a destruction efficiency of 95% we have: <br /> TPHg masse rate emitted from unit = .05 x 196 = 9.80(lbs/day) <br /> TPHg concentrations emittedfrom unit = .05 x 14,500 = 725 (mg/m3), <br /> Calculations, as above for TPHg, for the specific compounds analyzed in the vent test <br /> i <br /> give: <br /> benzene concentrations emitted from unit = 20.3 (mg/m3) <br /> benzene mass rate emitted from unit = .274 (lbs/day) <br /> toluene concentrations emitted from unit = 6.10 (mg/m3) <br /> toluene mass rate emitted from unit =..082 (lbs/day) <br />