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ESTIMATION OF DISSOLVED TPH AS GASOLINE IN GROUND WATER <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 concentration for the calculations used the September <br /> 25, 1991 concentrations for MW-2. <br /> 3) The ratio for lateral vs. vertical extent of the hydrocarbon plume is 1011. <br /> 4) Figure 14 illustrates plume volume. <br /> 5) Porosity = 40%. <br /> I Estimation of Dissolved Total Petroleum Hydrocarbons as gasoline. <br /> Pounds of TPHg = (volume) (porosity) 7.48 gallons 8.34 ppb <br /> 10 1 fr3 1 gallon 1X149 <br /> (A) Layer l <br /> (1) _ (10) (30) (4) (.40) 7.48 gallons 8.34 lb 5,700 ppb <br /> 1 ft 3 1 gallon 1X149 <br /> 0.54 lbs <br /> (2) = (it (20) (45) - n (10) (30)) (4) (.40) 7.48 gallons ( 8.34 1b � 3,200 ppb <br /> 1 ft 1 gallon 1X1 Q <br /> 0.6 lbs <br /> Ila <br /> RPTOO1.8lQ <br />