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Hydrogeologica/ Evaluation of Van 4 Mine <br />Geologic and Hydrogeo/ogic Conditions <br />Exhibit 2-1. Intrinsic Permeability and Hydraulic Conductivity of Sandstone Units Present in <br />Dolores River Basin. <br />Formation Aqui fer Intrinsic Permeability Hydraulic <br /> (millidarcy) Conductivity (cm/sec) <br />Dakota Sandstone Lower port on of the 740 7.1 E-04 <br /> Tertiary tb Upper <br /> Cretaceou aquifer <br />Sandstones of Morrison 110 1.1 E-04 <br />Formation (Salt Wash <br />Member) <br />Entrada Sandstone 200 1.9E-04 <br />Navajo Sandstone Mesozoic S andstone 160 1.5E-04 <br />Kayenta Formation Aqui fer 67 6.5E-05 <br />Wingate Sandstone 60 5.8E-05 <br />Lower Sandstone of 3.3 3.2E-06 <br />Chinle Formation <br />Notes: <br />Millidarcy = 1 x 10-3 Darcy. A Darcy is standard unit of intrinsic permeability and is equivalent to the <br />passage of one cubic centimeter of fluid of one centipoise viscosity flowing in one second under a <br />pressure differential of one atmosphere hrough a porous medium having a cross-section of one square <br />centimeter and a length of one centimeter (Bates and Jackson 1984. <br />• <br />.cm/sec=centimeters per second. <br />2.3 Local Hydrogeol <br />Framework <br />• <br />The local hydrogeologic fr <br />obtained during literature <br />visit. <br />2.3.1 Potential Aquifers in <br />In order to better define the for <br />defined by Weir et al. (1983) ha <br />summarized in Exhibit 2-2. <br /> <br />draft final van 4 hydmgeology mpod.doc <br />rk has been developed based on information <br />, discussions with Denison employees, and a site <br />of Van 4 Mine <br />hydrogeologic framework, the hydrogeologic units <br />been modified. These modifications are <br />2-8 <br />•