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.) Mass-Volume Calculation of Dissolved Hydrocarbons Chapin Brothers, Inc 1766 Monte Diablo Avenue, Stockton, California Assumptions • A total volume of 809,488 gallons was extracted from between 22 August and ' 27 December 2002 based on effluent flowmeter observations • 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= (809,488 gallons)(3 785 1/gal) = 3,063,912 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 [32 µg/l+ (1 1+320+670µg/1)13 + (20+280+850+180µg/1)/4 + 95µg/1+46µg/1] /5 ' MB,�,, = ( 3,063,912 liter)(167 µg/1 benzene) = 5.1 x 108µg Benzene MB,,,u11e as grams 511 g Benzene � . MBe,«e as kilograms 0.51 kg Benzene A conversion factor of 2 205 lb/kg can be used to convert Benzene to pounds MB.=ne= 0 51 kg Benzene (2 205 lb/kg) = 1.12 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 ' [2,600 µg/l+(710+8,100+12,000µg/1)13+ (1,500+6,100+11,000+13,000 µg/1)/4+2,700µg11+3,600[tg11] /5 ' MTPH_g= ( 3,063,912 liter)(4,747 µg/1 TPH-g) = 1 4 x 1010 µg TPH-g M,ITH_g as grams 14,500 g TPH-g ' MTPH g as kilograms 14.5 kg TPH-g A conversion factor of 2 205 lb/kg can be used to convert TPH-g to pounds MTPH_g= 14 4 kg TPH-g (2 205 lb/kg) = 31.9 lbs of TPH-g ' 112 Ibs of Benzene and 31.9 lbs of TPH-g is estimated to have been extracted by the ground water treatment system between 22 August and 27 December 2002 A cumulative total of 4.3 lbs of ' Benzene and 95.9 Ibs of TPH-g is estimated to have been extracted since ground water treatment began on 02 April 2002 I Advanced GeoEnvironmenta4 Inc 1