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RISC Manual Version 4 0 <br /> Figure C-1 shows the schematic of the saturated soil (groundwater)model <br /> Well <br /> � �"`Sea„ -f �� ��r �,'A—R► iAP 4A U% ��� !;MIA Vadose <br /> Zone <br /> i '" `+ �" `sRt :✓ �"'rn' ..,a+ 't'"cs` ,�''o+-Sw i'�e = ';pa ,a cr�., - <br /> ' EXpSlir$x_ rulsr eras r cE <br /> PYI�r�: <br /> Saturated <br /> Zone <br /> FIGURE C-1. Saturated Soil Model with Source in and above the Water <br /> . Table <br /> sC.2 TRANSPORT EQUATIONS�ANUPROCESSES' �4Y-4 <br /> The saturated soil model consists of a source model and a dissolved phase <br /> groundwater model The source model is used to estimate the mass loading rate (that <br /> serves as a source for the dissolved phase model) based on the concentrations of the <br /> individual constituent in soil and the concentration of TPH (if used to indicate <br /> presence of a mixture) <br /> The mass of chemical contained in the portion of the source above the water table (if <br /> any) is assumed to be leached due to infiltration The mass in the portion of the <br /> source below the water table (if any) is assumed to be leached horizontally with the <br /> groundwater flow These leaching rates are calculated from the effective solubility or <br /> from equilibrium partitioning That is, the equilibrium dissolved phase concentration <br /> is estimated and is assumed to be constant until the source is gone If the water table <br /> shifts during the year, the loading rates from the submerged portion of the source and <br /> • <br /> C-2 <br />