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SUBSURFACE VAPOR EXTRACTION SYSTEM <br /> CALCULATIONS TO CONVERT PhD READINGS <br /> TO GASCLINE RRlmOVAL RATE <br /> The following calculations demonstrate how to convert a <br /> photo-ionization (PID) reading to a gasoline mass removal rate. <br /> I. Chemical Characteristics of Gasoline <br /> Gasolinel Average2 Average2 <br /> Eydrocarbon Composition (yi) Molecular Density (Di) <br /> Type (i) (Volumetric Fraction)* Weight (MWi) (lb/ft3) <br /> n-paraffins 0.114 77 40 <br /> iso & <br /> cycloparaffins 0.52 107 44 <br /> mono-olefins 0.090 70 38 <br /> ti aromatics 0.284 92 54 <br /> Gasoline 1.000 <br /> 96 45 <br /> II, Molar Fraction <br /> X = X: x Di_x MW, <br /> Xi Dg x MWi <br /> where: <br /> Xi = molar fraction of hydrocarbon i (-? <br /> Yi - Volumetric fraction of hydrocarbon i <br /> Di - density of hydrocarbon i (lb/ft3) <br /> Dg - density of gasoline (lb/ft3) <br /> KWi = molecular weight of hydrocarbon i {-) <br /> 'HWg molecular weight of gasoline (-) <br /> .4 <br /> =all IBM 11111 111"1 fl, <br />