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IST Quarter 1993 EVES Report#695 <br /> FORMULA FOR CALCULATING HYDROCARBON MASS REMOVAL RATES <br /> The hydrocarbon mass removal rates (extraction rates in lb /day) presented in the various <br /> tables were calculated using the following formula <br /> lb /day= (VOC or BZ ppm) x (hrs/day)x (coef) x (scfin) <br /> Where <br /> VOC = Volatile Organic Compounds (Non-methane gasoline hydrocarbons) <br /> BZ = Benzene <br /> ppm=Concentration in parts per million (vol/vol) <br /> hrs/day= Operational hours per day <br /> scfm=Air flowrate in standard cubic feet per minute <br /> coef= Units of measure conversion coefficient (see below) <br /> Gasoline= 0 0000148 (lb)---------- <br /> (ppm x scfm x hr) <br /> Benzene= 0 00001217 lb -------------- <br /> (ppm x scfm x hr) <br /> The vapor concentrations and flowrates are expressed in terms of standard temperature <br /> and pressure conditions consisting of 200C and 760 mm Hg <br /> 1 <br />