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competent sandstone that show no visible signs of failure. The northern slopes of the <br />impoundment are 2h:1v or flatter and were created with graded spoil material. <br />DESIGN ANALYSIS <br />General PECOCO meets or exceeds the design and performance requirements of Colorado <br />Mined. Land Reclamation Division (CMLRD) for a permanent impoundment while utilizing as <br />much of the existing topography as possible. PECOCO complies with the following <br />specifications: <br />1. Provides a suitable water quality and a stable water level on a permanent basis <br />for grazing and wildlife purposes. <br />2. Provides a safe access for the proposed water users. <br />3. The size is adequate for the intended use. <br />4. The impoundment is suitable for the approved postmining land use. <br />5. Slope protection against erosion is provided due to vegetation. <br />Access and Size PECOCO has two areas that provide adequate and safe access for livestock <br />and wildlife. These areas are shown on Exhibit 7 -18 and include approximately 450 linear <br />feet along the waterline of the impoundment adjacent to the dam embankment and 130 linear <br />feet along the waterline at the pond inlet at the opposite end of the impoundment. Both <br />access areas fall within (4:1 or less) slope requirements specified by the Soil <br />Conservation Service (SCS) for safe access by livestock (see Colorado SCS Standard and <br />Specification #378, Ponds, dated January 1989). <br />Livestock have accessed PECOCO in 1991, 1992, and 1993. Big game use has been common <br />during the same period. There have been no problems with animal safety or access since <br />the pond's final configuration. Site analysis indicates construction of barrier fences <br />along steeper portions would be difficult without building them away from the waterline <br />edge. This will create an increased hazard for animals which may become trapped between <br />the water edge and fence. Animal use will continue to be monitored at PECOCO. Fence <br />barriers will be established if animal safety problems occur. <br />The size of PECOCO and the volume of permanent water normally present (assuming <br />approximately 23 acre -feet of water is available) is sufficiently large to provide <br />adequate water supply that exceeds the needs of anticipated livestock and wildlife <br />numbers. The large capacity, suitable water quality, permanence of the water supply, and <br />availability of access renders PECOCO suitable for the postmine land uses. <br />7 -6g -2 Revised 06/24/93 <br />N <br />to <br />LO <br />0 <br />• <br />'1 <br />