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Hydrogeological Evaluation of Sunday Mines Group <br />Geologic and Hydrologic Conditions <br />2.4 Local Hydrogeologic Framework <br />The local hydrogeologic framework is relatively complex as a result of structural <br />displacements associated with the Gypsum Valley anticline, the Disappointment <br />Valley syncline and associated faulting and folding. The Mesozoic aquifer and the <br />lower portion of the Tertiary to Upper Cretaceous aquifer are present in the general <br />vicinity of the Sunday Mines Group. The following sections provide additional detail <br />regarding the local hydrogeologic framework. <br />2.4.1 Potential Aquifers in Area of Sunday Mines Group <br />In order to better define the local hydrogeologic framework, the hydrogeologic units <br />defined by Weir et al. have been subdivided. These subdivisions are summarized in <br />Exhibit 2-2. <br />c _ _f1.-- -I 1...,7,.,.,....,1..?s;.• ,,-;+c ;" 77;r;slihI of thy Sundau Mines Groun. <br />• <br />• <br /> <br />Extifull G- G. 1JG lIlMUIX <br />Hydrogeologic v 1 -.r ...-•- - <br />Local - --- --- <br />Description <br />Unit Defined by Hydrologic <br />Weir et al. (1983) Unit <br />Mesozoic Aquifer Navajo Aquifer contains saturated portions of the <br /> Aquifer Cutler Formation, Chinle Formation, Wingate <br /> Sandstone, Kayenta Formation, Navajo <br /> Sandstone, and Entrada Sandstone. The <br /> aquifer is overlain by shale of the <br /> Summerville Formation, and underlain by <br /> rock salt of the Paradox Member of the <br /> Hermosa Formation. <br /> Salt Wash Aquifer includes the saturated portions of the <br /> Aquifer Saltwash Member of the Morrison Formation. <br /> This aquifer is overlain by bentonitic shales <br /> of the Brushy Basin Member of the Morrison <br /> Formation and is underlain by shale of the <br /> Summerville Formation. <br />Tertiary to Upper Dakota Aquifer contains the saturated portion of the <br />Cretaceous aquifer Aquifer Dakota Sandstone and the Burro Canyon <br /> Formation. It is overlain by the Mancos Shale <br /> and underlain by shale of the Brushy Basin <br /> member of the Morrison Formation. <br /> Mesaverde Not present in the Sunday Mines Group area. <br /> Aquifer <br />2-12 <br />T:\84986-Denison Mines\Task Order 3 - DMO Sampling and Analysis Plan\Task 3.14 - Hydrogeology ReportViinal sunday hydro report\textTINAL Sunday Hydrogeology Report.doc