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Saturated Zone Mode! <br /> • <br /> simulates the dissolved phase plume that may originate from a residual source Figure <br /> B-3 shows a simplified schematic <br /> Monitoring well Receptor well <br /> near source <br /> Pr+ `,a w <br /> '' <br /> tt `irAfPa�: -'aFe� �S +a <br /> O i <br /> Mr, <br /> t9"�i,'l of <br /> !yam -GR K' �'. ��YSn„�v. y ��yfl' y 4�� r 1(�& R"' l�F✓, <br /> �R'R".a" <br /> Residual <br /> source PAR& <br /> 1P <br /> rn KA ♦ Vt,. <br /> v4 <br /> rj <br /> x� <br /> v'�4 <br /> t` 1 <br /> • Planar source <br /> used in model <br /> Figure B-3. Schematic of Groundwater Model With a Residual Source <br /> In Figure B-3, the source is assumed to be in the shape of a vertical plane <br /> perpendicular to the direction of groundwater flow Using a vertical plane is similar <br /> to the geometry assumed in the Domenico groundwater model (Domenico, 1987) <br /> The width and depth of the vertical planar source should be estimated based on site <br /> data Usually the size of the source will not be known so estimating a conservative <br /> value may be appropriate <br /> B.4 2_Using the Model Without Concentration Data in the Source_ _ <br /> If there are no measurements of dissolved phase concentrations near or ,lust <br /> downgradient of the source, the source concentrations can be assumed to equal the <br /> chemical's effective solubility For this case, all of the groundwater passing through <br /> the source area is assumed to be equal to the constituent's effective solubility Since <br /> there are residual levels of contaminants in the source it might be reasonable {and <br /> i <br /> B-9 <br />