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t <br /> CONTAMINANT MASS CALCULATIONS <br /> Former Reeves Exxon, 2360 East Street, Tracy, CA <br /> Mass in Groundwater. <br /> Based on isoconcentration contours shown on attached groundwater gradient map <br /> Average conc are from September 1999 from wells MW1 and MW2 Well MW3 is Non-detect <br /> mass = (Volume in cu ft)(porosity)(Cone in ppb)(E-9)(7 48 gal/cu ft)(8 34 Ib1gal)(0 4536 kg/lb) <br /> Thickness of aquifer is 10 feet, porosity is 0 30, <br /> Average Mass of Mass of <br /> Contaminant fSq a (cuVolume <br /> Concentration Contaminant Contaminant <br /> (ug/1) (kg) (lbs) <br /> TPHG 8200 82000 890 0 06 014 <br /> Benzene 8200 82000 8 6 001 001 <br /> Toluene 8200 82000 0 0 000 000 <br /> Ethylbenzene 8200 82000 3 9 000 001 <br /> Xylenes 8200 82000 08. 000, 0 00 <br /> Reductions in Contaminant Concentrations in Groundwater <br /> Current percent <br /> Contaminant Historic High Concentration <br /> Se 1999 Reduction <br /> . Well MW1 <br /> TPHD 170 <50 >71 <br /> TPHG 2100 110 95% <br /> Benzene 210 7 2 97% <br /> Toluene 55 <0 5 >99% <br /> Ethylbenzene 90 3 0 97% <br /> Xylenes 130 <0 5 >99% <br /> Well MW2 <br /> TPHD 7200 <50 >99% <br /> TPHG 12000 68 99% <br /> Benzene 200 10 95% <br /> Toluene 84 <0 5 >99% <br /> Ethylbenzene 130 4 8 96% <br /> Xylenes 360 16 99% <br /> Well MW3 <br /> TPHD 150 <50 >67% <br /> TPHG 310 <50 >83% <br /> Benzene 11 <0 5 >95% <br /> Toluene 36 <0 5 >86% <br /> Ethylbenzene 66 <0 5 >92% <br /> Xylenes 11 <0 5 >95% <br /> contmass xis Page 2 <br />