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• Mass-Volume Calculation of Dissolved Hydrocarbons PACIFIC MINI MART 4511 Pacific Avenue, Stockton, California Assumptions • A total volume of 471,092 gallons was extracted from between 13 November 2001 and 20 March 2002 based on effluent flow meter observations • Data collected from the influent pump and treat grab water samples were representative of general extracted ground water conditions One gallon of contains 3 785 liter so the volume of processed water expressed as liters is V= (471,092 gallons)(3 785 l/gal) = 1,783,083 liter processed water IMultiplying the volume of the processed water by the average MTBE concentration (2,100 gg/l, 1,200µg/l, 780 41, 660µg/i and 540 µg/1) yields the approximate mass of MTBE removed from processed water MMTBE = (1,783,083 liter)(1,056 µg/l) = 1,882,935,648 pg MTBE MMTBE as grams 1,883 g MTBE MmT13E as kilograms 1.8 kg MTBE A conversion factor of 2 205 lb/kg can be used to convert MTBE to pounds WrME = 1 8 kg MTBE (2 205 lb/kg) = 3.969 lbs of MTBE ' Multiplying the volume of the processed water by the cumulative average benzene concentration yields the approximate mass of BTEX removed from processed water MB,.,,, _{ 1,783,083 liter)(588 µg/1) = 1,048,452,804 µg BTEX MsrnZene as grams 1,048 g BTEX ' MBen�ne as kilograms 1.048 kg BTEX A conversion factor of 2 205 lb/kg can be used to convert BTEX to pounds MB,rEx = 1 048 kg BTEX (2 205 lb/kg) = 2.3 lbs of BTEX ' Multiplying the volume of the pi ocessed water by the cumulative average TPH-g concentration yields the approximate mass of TPH-g removed from processed water 1V TrH_g= ( t,783,083 liter)(8,660 µg/1) = 1.5 x 10" µg TPH-g MTpH_g as grams 15,441 g TPH-g MTPH_g as kilograms 15 kg TPH-g A conversion factor of 2 205 lb/kg can be used to convert TPH-g to pounds MTpii_g= 15 kg TPH-g (2 205 lb/kg) = 34 Ibs of TPH-g • IAdvanced GeoEnvironmeataL Inc