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TABLE 8 <br />' CONTAMINANT MASS CALCULATIONS <br /> RESIDUAL GROUNDWATER CONTAMINATION <br /> 1140 W. Hammer Lane, Stockton, CA <br /> Area Volume Average Mass of Mass of <br /> t Contaminant (sq ft ) (cu ft.) Concentration Contaminant Contaminant <br /> (ug/1) (kg) (lbs) <br /> Zone 1 - Innermost contour <br />' TPHG 2200 33000 190000 444 976 <br /> Benzene 2200 33000 26500 0 62 136 <br /> Toluene 2200 33000 10000 023 0 51 <br /> Eth (benzene 2200 33000 5200 012 027 <br /> 1Xylenes 2200 33000 20509 048, <br /> 1 05 <br /> Zone 2 <br />' TPHG 2700 40500 27500 0 79 1 73 <br /> Benzene 2700 40500 2750 0 08 017 <br /> Toluene 2700 40500 2750 0 08 017 <br /> I Eth (benzene 2700 40500 2750 008 017 <br /> Xylenes 2700 40500 2750, 008, 0 17 <br /> Zone 3 <br /> TPHG 4400 66000 2750 013 0 28 <br /> Benzene 4400 66000 275 0 01 003 <br /> Toluene 4400 66000 275 0 01 0 03 <br />'• Eth (benzene 4400 66000 275 0 01 0 03 <br /> Xylenes 4400 66000 275, 0 01 0031 <br /> Zone 4 <br /> TPHG 5900 89000 275 002 004 <br /> Benzene 5900 89000 2 8 000 000 <br /> Toluene 5900 89000 2 8 000 000 <br />' Eth (benzene 5900 89000 2 8 000 0 00 <br /> Xylenes 5900 89000 2 8 000, 0 00 <br /> Total Mass of Contaminants in Groundwater <br /> TPHG 537 11 81 <br /> Benzene 0 71 1 57 <br /> Toluene 0 33 0 72 <br /> Eth lbenzene 0 21 N12 <br />' Xylenes 0 57 <br /> NOTES <br /> I Based on isoconcentration contours shown on February 9, 2001 isoconcentration map <br /> Assume similar distribution for other detected constituents <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 /> Thickness of aquifer is 15 feet, porosity is 0 25, <br /> contmass <br />