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• Channel lining rock riprap and energy dissipaters will be used when necessary. As stated <br />above, all temporary diversion structures will be seeded and revegetated. Colowyo does not <br />anticipate that there will be any significant excess material resulting from the construction of <br />diversion ditches. <br />None of the proposed diversions will drain into underground mines <br />No additional diversions of intermittent or perennial streams are planned or provided for at <br />this time. See Mine Plan Map (Map 23), Hydrology South Map (Map 12) and Hydrology - <br />North Map (Map 11). As indicated on these maps, the stream channels of Goodspring Creek <br />will be maintained in its natural positions. <br />4.05.5 Sediment Control Measures <br />Sediment control measures to be implemented are shown on the Hydrology -South Map <br />(Map 12) and the Hydrology -North Map (Map 1 I). These facilities, consisting primarily of <br />diversion ditches and sedimentation ponds, will be located, constructed and maintained to <br />avoid erosion and increased contribution of sediment load to runoff. Discussion on the <br />sediment and drainage control is presented under Section. 2.05.6. The design parameters of <br />the various sedimentation control measures are found in Exhibit 7, Hydrology Information. <br />As necessary, facilities to control sediment will be installed in areas above or below the <br />planned sites of disturbance. "Upstream" facilities, such as temporary diversion ditches and- <br />• check dams up slope from the mining activities, will divert runoff away from the disturbed <br />areas. Temporary diversion ditches below the disturbed area will divert runoff into sediment <br />ponds. The actual mining areas will aid in retaining sediment within the disturbed areas by <br />catching water in pits, small depressions and dozer basins, etc, in active, unreclaimed mine <br />workings. Water leaving the reclaimed areas will drain into contour furrows or other <br />sediment traps, as necessary, before entering the sedimentation pond. <br />4.05.6 Sedimentation Ponds <br />The location of all existing and planned sedimentation ponds ate presented on the Hydrology <br />- South Map (Map 12) and the Hydrology -North Map (Map 11). The design plans and <br />specifications for the sedimentation ponds are described in this section. The design <br />parameters and detailed sedimentation calculations for the sedimentation ponds are shown in <br />Exhibit 7, Hydrology Information. The sedimentation pond embankment and emergency <br />spillway design are also shown in Exhibit 7, Hydrology Information. All sedimentation ponds <br />will be located as close as practical to the areas to be disturbed. Other methods of sediment <br />control will be located on the reclaimed areas; these methods include the use of contour <br />furrowing, contour drainage ditches, chisel plowing and revegetation etc. <br />C~ <br />4.05-5 Revision Date: l l/18/98 <br />Revision No.: TR-41 <br />