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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 = Volatile Organic Compounds ({Von--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 to 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 <br /> standard temperature and pressure conditions consisting of 200C and <br /> 750 mm Hg <br /> 1 <br /> 1 <br />