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CONTAMINANT MASS CALCULATIONS <br /> Tuff Boy Trailers, 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 Ib/gal)(0 4536 kg/Ib) <br /> Thickness of aquifer is 10 feet, porosity is 0 30, <br /> Area me Average Mass of Mass of <br /> Contaminant (sq ft } (cu uft} Concentration Contaminant Contaminant <br /> (ug/1) k Ibs <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 5 6 000 000 <br /> .Xylenes 2356 23560 54, 000, <br /> 0 00 <br /> MTBE 33001 33000 411 0001 0 00 <br /> Reductions in Contaminant Concentrations in Groundwater <br /> Current Percent <br /> Contaminant Historic High Concentration <br /> MReduction <br /> (Mar 2002 <br /> Well MW1 <br /> MTBE 17 6 64% <br /> • TPHG 1200 570 53% <br /> Benzene 4 3 <0 5 >88% <br /> Toluene 1 3 <0 5 >61% <br /> Eth ]benzene 21 21 0 0% <br /> X lenes 21 20 5% <br /> Well MW2 <br /> MTBE 8 2 <2 0 >75% <br /> TPHG 640 >50 >92% <br /> Benzene 6 8 <0 5 >92% <br /> Toluene <0 5 <0 5 0% <br /> Eth (benzene 5 4 <0 5 1 >90% <br /> Xylenes 08 <1 0 0% <br /> Well MW3 <br /> MTBE 41 36 12% <br /> TPHG <50 <50 0% <br /> Benzene <05 <0 5 0% <br /> �Iben <br /> <0 5 <0 5 0% <br /> ne <0 5 <D 5 0% <br /> Xylenes <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 />