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I <br /> 3. Calculation of recovered hydrocarbons (measured as TPH) <br /> 1 <br /> Assumptions, <br />' - Standard conditions <br /> - One mole of any gas occupies 24 5 liter at standard conditions <br /> 1 <br /> lb/day = [vapor concentration (in mg/cubic meter)] X [flow rate (scfm)] <br />' X [1 cubic meter/35 31 cubic feet] X [1440 min/day] X <br /> [ 1 lb/453,592 mg] <br /> 4. Conversion of TPH (in mg/cubic meter) to TPH (ppmv) <br /> Assume molecular weight of gasoline = 86 grams <br /> mg/cubic meter = [ppmv] X [molecular wt/24 5 liter] <br /> [ppmv] X 3 51 <br /> For conversion of other gasoline constituents, assume the following <br /> ' molecular weights <br /> Benzene = 78 1 g <br /> ' Toluene = 921 g <br /> Ethylbenzene = 106.2 g <br /> ' Xylenes = 106 2 g <br /> 1 <br /> I' <br />