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JD-6 Mine Report <br />Geoscience Services <br />Daniels Inc., Gaz de France (France), SAIL, Shell Oil, SOHIO, and Westinghouse <br />Hanford Company. Over 160 publications and project reports on the benchmarking, <br />verification, and applications of PORFLOW are currently available. <br />Tn summary, PORFLOW is a robust simulation code that has a direct application <br /> <br />to the multi-phase contaminant transport problem at the mine site. The code has been <br />extensively validated by independent researchers and has been used to model similaz <br />hydrogeologic systems at other facilities. <br />4.0 Model Description <br />A two-dimensional computer model was developed for the SM-18 mine that can <br />be applied to the JD-6 mine. Since the geology is similar for both areas, the distance of <br />transport predicted at the SM-18 mine can be applied to the JD-6 mine. The model uses <br />132 by 89 variable-size grids to define the problem domain which is a vertical slice <br />running from the mining operations to the San Miguel River. The base of the Entrada <br />Sandstone forms the base of the model where it is assumed that horizontal groundwater <br />flow dominates flow conditions. Mixed flow conditions were assigned to the end <br />boundaries of the model. No flow conditions were assigned to the unsaturated portion of <br />these boundaries (assumes vertical movement of water in the unsaturated zone) and <br />constant head boundaries were assigned in the Entrada Sandstone aquifer based on river <br />elevation and an assumed hydraulic gradient of 0.007(assumes horizontal groundwater <br />flow in the Entrada Aquifer). Constant flux conditions were maintain at the top of the <br />model to simulation recharge by precipitation at a rate equal to 1/l0a' of the yearly <br />precipitation rate of 12 inches per year for the area. This is considered a conservative <br />assumption since potential evapotranspiration rates for the area far exceed yearly <br />precipitation. <br />Nodes within the problem domain were assigned hydraulic properties to delineate <br />the various sandstone and shale/mudstone layers that underlie the mine site. There is <br />only limited information available for the hydraulic properties of the geologic formations <br />7 <br />