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FORMULA FOR CALCULATING HYDROCARBON MASS REMOVAL RATES <br /> The hydrocarbon mass removal rates (extraction rates in lbs/day) <br /> presented in the various tables were calculated using the following <br /> formula: <br /> lbs/day = (VOC or BZ ppm) x (hrs/day) x (coef) x (scfm) <br /> Where: <br /> VOC = Volati1e Organic Compounds (Non—methane gasoline <br /> 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 <br /> temperature and pressure conditions consisting of 200C and <br /> 760 mm Hg. <br />