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INC. SACRAMENTO <br /> presented in Table 3 . These data indicated that the values of <br /> total petroleum hydrocarbons detected in the field were two to <br /> three times the concentrations reported by the laboratory. <br /> Therefore, Versar has used the laboratory analytical <br /> concentrations in calculating the vapor and product recovery <br /> rates. <br /> Calculated vapor and product recovery rates for this <br /> reporting period are included in Table 4 . The following equation <br /> was used to estimate the hydrocarbon vapor recovery volumes: <br /> V,. (ge(/ft') = I(V,mg/m') (0.13947 gal/lb)]/((103 mg/gm) (454 gm/lb) (35.31 ft'/m')] <br /> where: Vr = vapor recovery volume (gallons per cubic foot) <br /> VC = soil-vapor TPH-G concentration <br /> 0. 1.3947 = product volume per pound <br /> The following equation was used to calculate product volume per <br /> pound: <br /> 0.13947 = (454 gm/lb)/t(3.785 L/gal) (103cc/L) (0.86 gm/cc)] <br /> where: 0. 86 gm/cc is the average specific gravity for diesel <br /> (Genium, 1981) <br /> Approximately 0. 5 gallons of diesel were recovered during this <br /> pilot study. <br /> 16 <br />