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Hydrogeological Evaluation of Sunday Mines Group <br />Geologic and Hydrologic Conditions <br />to permeability at numerous localities within the Uravan Mineral District, which <br />contains the project area. Jobim developed a series of isopermeabilty contour maps <br />that provide intrinsic permeability data for the general vicinity of the Sunday Mines <br />Group area. Intrinsic permeability data from Jobim (1962) are provided for the <br />various sandstone units within the Mesozoic and Tertiary to Upper Cretaceous <br />aquifers in Exhibit 2-1. In addition, Exhibit 2-1 provides hydraulic conductivity data <br />for the rock units, which were calculated from the intrinsic permeability data. <br />Exhibit 2-1. Intrinsic permeability and hydraulic conductivity of sandstone units present in <br />Dolores Basin <br />• <br />• <br /> <br />Notes: <br />Formation Aquifer Intrinsic Hydrualic <br /> Permeability Conductivity <br /> (millidarcy) (cm/sec) <br />Dakota Sandstone Lower portion of 740 7.1E-04 <br /> the Tertiary to <br /> Upper Cretaceous <br /> aquifer <br />Sandstones of 110 1.1E-04 <br />Morrison Formation Mesozoic <br />(Salt Wash Member) Sandstone Aquifer <br />Entrada Sandstone 200 1.9E-04 <br />Navajo Sandstone 160 1.5E-04 <br />Kayenta Formation 67 6.5E-05 <br />Wingate Sandstone 60 5.8E-OS <br />Lower Sandstone of 3.3 3.2E-06 <br />Chinle Formation <br />Millidarcy =1 x 10-3 Darcy. A Darcy is a 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 through a porous medium having a cross-section of one square <br />centimeter and a length of one centimeter (Bates and Jackson 1984). <br />cm/sec= centimeters per second <br />2-11 <br />T:\84986-Denison Mines\Task Order 3 - DMO Sampling and Analysis Plan\Task 3.14 - Hydrogeology ReporUnal sunday hydro report\teXITINAL Sunday Hydrogeology Report.doc