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APPENDIX E Volume-Mass Calculation of Dissolved Hydrocarbons Former STOCKTON PLATING Facility 632 South El Dorado Street, Stockton, California Assumptions • A total volume of 231,216 gallons was extracted from between 11 February and 21 April 2004 based on effluent flow meter observations (note this value includes volume removed after the end of the first quarter 2004) • Data collected from the influent pump and treat grab water samples were representative of general extracted ground water conditions One gallon contains 3 785 Iiter so the volume of processed water expressed as liters is V=(231,216 gallons)(3 785 1/gal) = 875,152.5 liter processed water • Multiplying the volume of the processed water by the cumulative average benzene concentration yields the approximate mass of benzene removed from processed water February 3,400 µg/l + March 880 µg/1 +April 820 µg/l/ 3 = 1,700 µg/1 MBenzene = (875,152.5 liter)(1,700 µg/1 benzene) = 1.48 x 109µg Benzene MBenzene as grams 1,487.75 g Benzene MBenml, as kilograms 1.48 kg Benzene A conversion factor of 2 205 lb/kg can be used to convert Benzene to pounds MBenzene = 1 48 kg Benzene (2 205 lb/kg) =3.28 lbs of Benzene • Multiplying the volume of the processed water by the cumulative average TPH-g concentration yields the approximate mass of TPH-g removed from processed water February 18,000 µg/1 + March 5,700 µg/1 +April 5,400 µg/l / 3 = 9,700 µg/1 MTPH_g= ( 875,152.5 liter)( 9,700 µg/1 TPH-g) = 8.48 x 109 µg TPH-g MTPH_g as grams 8,488.97 g TPH-g MTPH_g as kilograms 8.4889 kg TPH-g A conversion factor of 2 205 lb/kg can be used to convert TPH-g to pounds MTPH_g= 8 48 kg TPH-g (2 205 lb/kg) = 18.7 lbs of TPH-g •