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1st Quarter 1993 SVES Report,Beacon #502 Lodi <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 (scfm) <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 /> L (ppm x scfin 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 />' 4 <br />