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TABLE <br /> CONTAMINANT MASS CALCULATIONS <br /> RESIDUAL SOIL AND GROUNDWATER CONTAMINATION <br /> '• 612 W. 11th STREET, TRACY, CA <br /> Area Volume Average Mass of Mass of <br /> Contaminant (s4 ft ) (cu ft.) Concentration Contaminant Contaminant <br /> (ug/1) k lbs <br /> TPHa 1060 15900 2300 00362 0 0797 <br /> Benzene 265 3975 0 7 000003 000006 <br /> Toluene 265 3975 1 1 000004 000010 <br /> Eth lbenzene 265 3975 2 0 000008 000017 r] <br /> Xylenes 265 3975 21, 000008, 000018 <br /> s <br /> NOTES <br /> Based on isoconcentration contours shown on isoconcentration map <br /> Concentrations based upon most recent groundwater analytical results <br /> mass = (Volume in cu ft)(porosity)(Conc in ppb)(E-9)(7 48 gal/cu ft)(8 34 Iblgal)(0 4536 kg/lb) <br /> Aquifer thickness = 15 feet, porosity = 0 35, <br /> contmass_soil_gw As <br />