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j <br /> i <br /> DEC04 <br /> CONTAMINANT MASS CALCULATIONS <br /> Tuff Boy Trailers, 5151 Almondwood Dr. Manteca <br /> L <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 gallcu ft)(8.34 Ib/gal)(0.4536 kg/Ib) <br /> Thickness of aquifer is 13 feet; porosity is 0.30; ' <br /> Average Mass of Mass of Volume of Volume of <br /> Contaminant <br /> Area ft Volume Concentration Contaminant Contaminant Density of . <br /> ( q. ) (cu. ft.) (u91I? Contaminant Contaminant Contaminant <br /> (k ) (lbs) gallons (teas pons) <br /> MTBE zone 1 310D 40300 4.3 0.40147 0.00324 D.74 O.1,111]05 0.402737047 <br /> MTBE zone 2 1 54001 702001 2.0 0.00119 U02621 0.74 0.0004 0.326298583 <br /> 0.00266 0.00586 0.00095 0.73 <br /> Reductions in Contaminant Concentrations in Groundwater - <br /> MTBE Historic High Dec-04 Percent - --_.---- --.- --- -- _-_�-- <br /> Reduction <br /> MW1 26 2.8 89% <br /> M W3 14 4.9 65% -� ----- --- -- - -- -- <br /> MW4�_.. _. 16-- -- M �<0.5 - w �- >96% <br /> y MW5 9.9 4.9 50% , <br /> M W6 <2.0 <0.5 NA <br /> M W7 <2.0 <0.5 NA <br /> Alternate Calculation <br /> Average Mass of Mass of Volume of Volume of <br /> y Contaminant (sqr Area <br /> (cuuft) Concentration Contaminant Contaminant Density of <br /> nt Contaminant Contaminant <br /> Contaminant(ug/1) (kg) (Ibs) (gallons} teaspoons) <br /> MTBE zone 1 8500 110500 3.1 0.00291 0.00640 0.74 0.0010 0.796108116 <br /> MTBE zone 2 0 0 2.0 0.0000D 0.00000 0.74 0.O000 0 <br /> f <br /> 0.002911 0.00640 0.00104 0.80 <br /> Page 1 <br /> i <br />