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IMass-Volume Calculation of Dissolved Hydrocarbons PACTFIC MINI MART ' 4511 Pacific Avenue, Stockton, California Assumptions ' A total volurne of 281,997 4 gallons was extracted from between 20 March and 05 June 2002 based on effluent flow metei observations • Data collected from the influent pump and treat grab water samples were representative of general extracted gi ound water conditions One gallon of contains 3 785 liter so the volume of processed water expressed as liters is V= (281,997 4 gallons)(3 785 l/gal) = 1,067,360 liter processed water ' a Multiplying the volume of the pi ocessed water by the average MTBE concentration • (540 gg/l, 370 gg/l, 300 Rg/1 and 360 µg/l) yields the approximate mass of MTBE removed ' from processed water MMTBE = ( 1,067,360 litei)( 392 µg/1) = 418,938,800µg MTBE MMTBE as grams 420 g MTBE MMTBE as kilograms 0.42 kg MTBE A conversion factor of 2 205 lb/kg can be used to convert MTBE to pounds ' MMTBE = 0 42 kg MTBE (2 205 lb/kg) = 0.93 lbs of MTBE • Multiplying the volume of the processed water by the cumulative aveiage benzene concentration yields the approximate mass of BTEX removed from processed water MBenzene — (1,067,360 liter)( 262 µg/1 average) = 279,648,320 pg BTEX 1 MB,..,,, as grams 280 g BTEX MB.Z.0 as kilograms 0.28 kg BTEX A conversion factor of 2 205 lb/kg can be used to convert BTEX to pounds ' MBTEx = 0 28 kg BTEX (2 205 lb/kg) = 0.62 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 MTPH-g= ( 1,067,360 hter)(5,275 gg/1) = 5.6 x 10' pg TPH--g MTPH_g as grams 5,600 g TPH-g MTPH_g as kilograms 5.6 kg TPH-g A conversion factor of 2 205 lb/kg can be used to convert TPH-g to pounds ' MTPH_g= 5 6 kg TPH-g (2 205 lb/kg) = 12 lbs of TPH-g • Advanced GeoEnvironmental,Inc