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ESTIMATION OF PETROLEUM HYDROCARBONS <br /> EXISTING IN GROI=TND WATER PRIOR TO REMEDIATION <br /> (Based on first quarter 1994 monitoring) <br /> Beacon Station No 695 <br /> 900 South Cherokee Lane <br /> Lodi, California <br /> Assuinotions: <br /> 1 First quarter 1994 sampling events used for calculations purposes <br /> 2 The ratio of lateral vs vertical extent of the hydrocarbon plume is 10/1 <br /> 3 Figure 28 illustrates plume volume. <br /> 4 Porosity = 40% <br /> L Estimation of TPH as gasoline existing m ground water prior to remediation <br /> Pounds of TPHg = (volume) (porosity) 7.48 gallons (8-34 lbs <br /> ) 1 fts 1 gallon I x 109 <br /> ppb <br /> (A) Layer A (0-7 feet) <br /> 1 Pounds of TPH as gasoline (Volume 1) <br /> C = 3,767 ppb <br /> = a (110) (50) (7) (0 40) 7 48 gallons 8.34 lbs (3,767 ppb <br /> I ft3 1 gallon 1 x 109 <br /> 11 4 lbs <br /> MS002 915 <br />