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Saturated Soil Model <br /> the unsaturated portion also shift accordingly If the water table doesn't fluctuate,the <br /> mass loading rate is assumed to be constant until the source is depleted The source <br /> model accounts for mass balance as the source "shuts off' after the mass of the <br /> constituent has been depleted <br /> 7.7 7 y " 7-7 777 <br /> � <br /> aC3SOURCE MODEL <br /> The source is defined by a specifying a total soil concentration for each chemical <br /> modeled and the total source volume The source may be dust above the water table, <br /> partially submerged, or completely submerged The water table may be considered to <br /> fluctuate during part of the year Mass loading is due to (1) groundwater flow <br /> through the source zone that is submerged, and (2) rainwater infiltration through the <br /> source zone that is above the water table <br /> The total initial mass of contaminant is calculated as follows <br /> Crpb H W L (1E6cm3'm3) <br /> Mass= (C-1) <br /> (1000 g/kg) <br /> where <br /> Mass = total initial mass in saturated source [mg] <br /> CT = total concentration in soil [mglkg] <br /> pb = soil bulk density [g/cm3] <br /> H = height of source [m] <br /> W = width of source [m] <br /> L = length of source [m] <br /> The total initial mass is depleted when the groundwater carries away the contaminant <br /> in the dissolved phase The depletion (and hence source term for the groundwater <br /> model) is calculated by estimating the dissolved phase contaminant concentration in <br /> C-3 <br />