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4th Quarter 1992 SUES Report, Beacon Station #695, 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 /> (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 />