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2.04.7 Hydrology Description <br />• <br />{1) Groundwater Information <br />(a)(i) According to the Willard Owens and Associates report in Appendix 7-1, the <br />Collins report in Appendix 7-2, and the Graystone report in Appendix 7-3, with <br />the exception of the Colorado River alluvium, there are by Definition 1.04(14), no <br />aquifers in this area that can store and transmit water of sufficient quality or <br />quantity for beneficial use. The depth below the surface, sequence and geologic <br />characteristics of each stratum in the permit area are described in Tab Section 6 <br />(2.04.6) and are shown in Exhibits 13-16, 39, 40, 43 and 44, also located in Tab <br />Section 6. <br />The permit area is situated within the sedimentary Mesa Verde Group. The <br />Rollins Sandstone Formation, the Mount Garfield Formation, and undifferentiated <br />• sandstones and shales of the Mesa Verde outcrop in Del3eque Canyon. The <br />Canyon contains the Colorado River and splits the permit area east and west. <br />The valley floor adjacent to the river is built up ~ ~ alluvial deposits from the <br />river and talus from the adjacent slopes. The ~, ;al deposit of the Colorado <br />River flood plain is the only formation that meets the definition of an aquifer. The <br />alluvium contains water from the river and presumable discharges water to the <br />permeable units which subcrop beneath it. This alluvial deposit is mapped in <br />Exhibit 13, Tab Section 6. No mining will take place below the Colorado River. <br />The water table in the permit area is controlled by a combination of the river, <br />local precipitation, topography, stratigraphy, and geologic structure. The water <br />table above the level of the river is discontinuous due to the interbedded <br />sandstones and shales of the upper portion of the Mesa Verde formation. Any <br />• 7-1 (Rev. 9/17/97) <br />