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\J <br />\J <br />• <br />needed for sediment control in accordance with the Operations and <br />Reclamation Plan described in 2.05.4. <br />Channel lining rock riprap and energy dissipaters will be used when <br />necessary. As stated above, all temporary diversion structures will be <br />seeded and revegetated. Colowyo does not anticipate that there will be <br />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 <br />or provided for at this time. See Mine Plan Map (Map 23), Hydrology <br />South Map (Map 12) and Hydrology - North Map (Map 11). As indicated on <br />these maps, the stream channels of Goodspring Creek will be maintained <br />in its natural positions. <br />4.05.5 Sediment Control Measures <br />Sediment control measures to be implemented are shown on the Hydrology <br />- South Map (Map 12) and the Hydrology - North Map (Map 11). These <br />facilities, consisting primarily of diversion ditches and sedimentation <br />ponds, will be located, constructed and maintained to avoid erosion and <br />increased contribution of sediment load to runoff. Discussion on the <br />sediment and drainage control is presented under Section 2.05.6. The <br />design parameters of the various sedimentation control measures are found <br />in Exhibit 7, Hydrology Information. <br />As necessary, facilities to control sediment will be installed in areas <br />above or below the planned sites of disturbance. "Upstream" facilities, <br />such as temporary diversion ditches and check dams up slope from the <br />mining activities, will divert runoff away from the disturbed areas. <br />Temporary diversion ditches below the disturbed area will divert runoff <br />into sediment ponds. The actual mining areas will aid in retaining <br />sediment within the disturbed areas by catching water in pits, small <br />depressions and dozer basins, etc. in active, unreclaimed mine workings. <br />Water leaving the reclaimed areas will drain into contour furrows or <br />other sediment traps, as necessary, before entering the sedimentation <br />pond. <br />4.05.6 Sedimentation Ponds <br />The location of all existing and planned sedimentation ponds are <br />presented on the Hydrology - South Map (Map 12) and the Hydrology - North <br />Map (Map 11). The design plans and specifications for the sedimentation <br />ponds are described in this section. The design parameters and detailed <br />sedimentation calculations for the sedimentation ponds are shown in <br />Exhibit 7, Hydrology Information. The sedimentation pond embankment and <br />emergency spillway design are also shown in Exhibit 7, Hydrology <br />Information. All sedimentation ponds will be located as close as <br />practical to the areas to be disturbed. Other methods of sediment <br />control will be located on the reclaimed areas; these methods include the <br />4 . 0 5 - 5 RevGSan Submi~ed q•,lq• QR <br />~5~, ~. 7'~P- 9i <br />