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,t <br /> CONTAMINANT MASS CALCULATIONS <br /> Tuff Boy Traders, 5151 Almondwood Dr Manteca <br /> • Mass in Groundwater. <br /> Based on isoconcentration contours shown on attached map <br /> mass = (Volume in cu ft)(porosity)(Conc in ppb)(E-9)(7 48 gal/cu ft)(8 34 lb/gal)(0 4536 kg/Ib) <br /> Thickness of aquifer is 10 feet, porosity is 0 30, <br /> Area Volume Average Mass of Mass of <br /> Contaminant Concentration Contaminant Contaminant <br /> (sq ft 1 (cu ft ) (u911) k Itis <br /> TPHG 2356 23560 1800 004 008 <br /> Benzene 2356 23560 0 5 000 000 <br /> Toluene 2356 23560 0 5 000 000 <br /> Eth (benzene 2356 23560 56 000 000 <br /> ,Xylenes 2356 23560 54 000 000 <br /> MTBE 33001 330001 411 0001 0001 <br /> Reductions in Contaminant Concentrations in Groundwater <br /> Current Percent <br /> Contaminant Historic High Concentration Reduction <br /> Mar 2002 <br /> Well MW1 <br /> MTBE 17 6 64% <br /> TPHG 1200 570 53% <br /> • Benzene 43 <0 5 >88% <br /> Toluene 1 3 <0 5 >61% <br /> Eth (benzene 21 21 0 0% <br /> ___Xylenes 21 20 t 5% <br /> Well MW2 <br /> MTBE 82 <2 0 >75% <br /> TPHG 640 >50 >92% <br /> Benzene 6 8 <0 5 >92% <br /> Toluene <0 5 <05 0% <br /> Eth (benzene 5 4 <0 5 >90% <br /> ___Xylenes 08 <1 0 0% <br /> Well MW3 <br /> MTBE 41 36 12% <br /> TPHG <56 <50 0% <br /> Benzene <0 5 <0 5 0% <br /> Toluene <0 5 <0 5 0% <br /> Eth (benzene <0 5 <0 5 0% <br /> X lenes <1 0 <1 0 0% <br /> Well MW4 <br /> MTBE 16 4 8 70% <br /> TPHG <50 <50 0% <br /> Benzene <0 5 <0 5 0% <br /> Toluene <0 5 <0 5 0% <br /> Eth (benzene <0 5 <0 5 0% <br /> • Xylenes <1 0 <1 0 0% <br /> contmass As Page 2 <br />