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Ai 0 i <br /> DEC04 <br /> CONTAMINANT MASS CALCULATIONS <br /> Tuff Boy Trailers, 5151 Almondwood Dr Manteca <br /> Mass in Groundwater. <br /> Based on isoconcentration contours shown on attached groundwater gradient map <br /> Average conc are from December 2004 <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 13 feet, porosity is 0 30, <br /> Area Volume <br /> Average Mass of Mass of Volume of Volume of Density of <br /> Contaminant Concentration Contaminant Contaminant Contaminant Contammant <br /> (sq ft) (cu ft) (Ug►I) kg) I (Ibsl Contaminant (gallons) teas oons <br /> MTBE zone 1 1 31001 403001 431 0001471 0003241 0741 0 0005 0402737047 <br /> MTBE zone 2 1 54001 702001 201 0001191 0 002621 0741 000041 0326298583 <br /> 0 00266 000586 000095 073 <br /> Reductions in Contaminant Concentrations in Groundwater <br /> MTBE Historic High Dec-04 Percent <br /> Reduction <br /> MW1 26 2 8 89% <br /> MW2 8 2 1 9 77% <br /> MW3 14 4 9 65% <br /> MW4 16 <0 5 X96% <br /> MW5 9 9 1 4 9 50% <br /> MW6 <2 0 <0 5 NA <br /> MW7 <2 0 <0 5 NA <br /> Alternate Calculation <br /> Area Volume Average Mass of Mass of Density of Volume of Volume of <br /> Contaminant Contaminant Concentration Contaminant Contaminant Contaminant Contaminant <br /> (sq ft) (cu ft) (ug/1) k ) Ibs (gallons) (teas oons) <br /> MTBE*zone 1 85001 1105001 311 0 00291 0006401 0741 0 00101 0 796108116 <br /> MTBE zone 2 01 01 2 01 0000001 0000001 0741 000001 0 <br /> 0002911 0 00640 1 0 00104 0 80 <br /> Page 1 <br />