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1 Volume-Mass Calculation of Dissolved Hydrocarbons Chapin Brothers Investments, Inc 1766 Monte Diablo Avenue, Stockton, California Assumptions • A total volume of 250,254 gallons was extracted from between 19 September and 15 December 2003 based on effluent flow meter observations(note this value was reduced due to a one month ground water rcmediation hiatus from 18 October to 18 November) • Data collected from the influent pump and treat grab water samples were representative of general extracted ground water conditions One gallon contains 3 785 liter so the volume of processed water expressed as liters is V= (250,254 gallons)(3 785 1/gal)— 947,2114 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 October 89 5 µg/1 +November 49 5 µg/i + December 162 4 µg/1 13 = 100 µg/1 M13enzene= ( 947,211.4 liter)(100 µg/1 benzene) = 9 47 x 107µg Benzene MBen�ene as grams 94.7 g Benzene MiBm,ne as kilograms 0.0947 kg Benzene A conversion factor of 2 205 lb/kg can be used to convert Benzene to pounds MaenZene = 0 0947 kg Benzene (2 205 lb/kg) = 0 2 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 October 4,050 µg/l +November 1,382 5 µg/l +December 4,152 5 gg/l/ 3 = 3,195 µg/l MTPH a= ( 947,2114 liter)( 3,195 µg/1 TPH-g) = 3 x 104 µg TPH-g MTPH_g as grams 3,026 g TPH-g MTPH g, as kilograms 3 kg TPH-g A conversion factor of 2 205 lb/kg can be used to convert TPH-g to pounds MTPH s = 3 kg TPH-g (2 205 lb/kg)= 6 67 lbs of TPH-g A cumulative total of 5 89 lbs of Benzene and 146.7 lbs of TPH-g is estimated to have been extracted since ground water treatment began on 02 April 2002 Advanced GeAnvirnnmental,Inc