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NOV05 <br /> CONTAMINANT MASS CALCULATIONS v <br /> Tuff Boy Trailers, 5151 Almondwood Dr Manteca <br /> Mass in Groundwater. <br /> Based on isoconcentration contours shown o attached map <br /> Average cone are from November 2005 <br /> mass = (Volume in cu ft)(porosity)(Cone in ppb)(E-9)(7 48 gal/cu ft)(8 34 Ib/gal)(0 4536 kg/lb) <br /> Thickness of aquifer is 15 feet, porosity is 0 30, <br /> Area Volume Average Mass of Mass of Density of Volume of Volume of Contaminant <br /> Contaminant Concentration Contaminant Contaminant Contaminant Contaminant <br /> {sq ft) (Cu ft) (ugII) (k ) (lbs) allons (teaspoons <br /> MTBE zone 1 2201 3300 501 0000141 000031 074 00000 0038347056 <br /> MTBE zone 2 38651 57975 301 0001481 000325 074 00005 0404212828 <br /> MTBE zone 3 29501 44250 1 01 0000381 000083 074 00001 0102839831 <br /> sum 0001991 0004381 0 000711 055 <br /> Reductions in Contaminant Concentrations in Groundwater <br /> MTBE Historic High Nov-05 Percent <br /> Reduton <br /> MW1 26 14 95% <br /> MW2 8 2 3 4 58% <br /> MW3 14 <0 5 >96% <br /> MW4 16 <0 5 >96% <br /> MW5 9 9 5 3 46% <br /> MW6 <2 0 <0 5 NA <br /> MW7 <2 0 <0 5 NA <br /> MW8 <0 5 <0 5 NA <br /> MW9 16 <0 5 69% <br /> MW10 3 5 3 5 NA <br /> MW11 D <0 5 <0 5 NA <br /> sum 84 2 171 80% <br /> I <br /> Alternate Calculation <br /> Page 1 <br />