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ESTIMATION OF PETROLEUM HYDROCARBONS <br /> EXISTING IN GROUND WATER PRIOR TO REMEDIATION-Continued <br /> (Based on first quarter 1994 monitoring) <br /> Beacon Station No 695 <br /> 900 South Cherokee Lane <br /> Lodi, California <br /> II Estimation of Benzene existing in ground water prior to remediation <br /> Assumption: <br /> 1 For ground water samples that contained TPH as gasoline concentrations with benzene <br /> concentrations below the detection limit The detection limit for benzene was used for <br /> time calculation <br /> (A) Layer A (0-7 feet) <br /> 1 Pounds of benzene (Volume 1) <br /> C = 11_nob <br /> = n (110) (50) (7) (0 40) 7.48 gallons 8.34 lbs 11 ppb <br /> 1 ft3 1 gallon 1 x 1 <br /> 0 <br /> 9 <br /> 0 03 lbs <br /> 2 Pounds of TPH as gasoline (Volume 2) <br /> C = 2 5 RRb <br /> gallons 8.34 lbs <br /> = ((zaa) (lam) - (150h (70)) c7h (0.40) 7 48 1 fr3 ( 1 gallon2S ppb1 x j09 <br /> = 0 013 lbs <br /> MS002 915 <br />