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1 <br /> Vadose Zone Model <br /> OrA P C U. <br /> R <br /> s <br /> ��� <br /> 1 The Vadose Zone model simulates the transport of dissolved phase <br /> ' contaminants downward, and vapor phase contaminants upward it does not <br /> simulate the movement of non-aqueous phase liquids(NAPLs) <br /> ' 2 The Vadose Zone model is a one-dimensional model (from the source to the <br /> water table)and accounts for volatile and leachability losses from the source <br /> ' 3 The vadose zone is considered to be homogeneous and uniform below the <br /> source(a lens may be modeled above the source) The hydraulic conductivity <br /> is calculated as a function of moisture content, however, this derived moisture <br /> content is assumed to be constant for the entire depth of the soil column <br /> 4 The contaminant source has a uniform concentration across the user-specified <br /> source volume <br /> 5 Water table fluctuations are not considered The depth to the aquifer is <br /> considered fixed <br /> Brooks, R H and A T Corey, 1964 Hydraulic Properties of Porous Media, <br /> Hydrology Paper No 3, Civil Engineering Dept,Colorado State University, <br /> Fort Collins, Colorado <br /> Carsel, R F and R S Parrish "Developing joint probability distributions of soil water <br /> retention characteristics " Water Resources Research, 24(1988) 755-769 <br /> Gelhar,L W , A Mantoglou, C Welty, and K R Rehfeldt 1985 A Review of <br /> Field-Scale Physical Solute Transport Processes in Saturated and Unsaturated <br /> ' Porous Media,EPRL EA-4190,Research Project 2485-5 Palo Alto, CA <br /> • <br /> A-21 <br />