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ESTIMATION OF DISSOLVED BENZENE IN GROUND WATER <br /> lie <br /> March 26, 1992 <br /> Former Exxon Service Station No. 7-3330 <br /> 3128 West Benjamin Holt Drive <br /> Stockton, California <br /> Assumptions: <br /> 1) March 26, 1992 sampling event considered starting point. <br /> 2) Monitoring well MW-2 was destroyed in 1991. The concentrations for the calculations used the <br /> September 25, 1991 concentrations for MW-2. <br /> 3) The ratio for lateral vs. vertical extent of the hydrocarbon plume is 1011. <br /> 4) Figure 15 illustrates plume volume. <br /> 5) Porosity V 40%. <br /> I Estimation of Dissolved Benzene <br /> Pounds of benzene = (volume) (porosity) <br /> 7.48 gallons 8.34 ppb <br /> lie 1 ft3 1 gallon 1X109 <br /> (A) Layer I <br /> (1) = Iz (10) (30) (4) (.40) 7.48 gallons 8.34 lbs 1,600 ppb <br /> 1 ft3 1 gallon 1X109 <br /> 0.15 lbs <br /> (2) _ (1c (20) (45) - n (10) (30)) (4) (.40) 7.48 gallons � 8.34 lbs 1,000 pp b <br /> 1 ft3 gallon 1X10 <br /> 0.19 lbs <br /> RPT001.810 <br />