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11), will divert runoff away from disturbed areas, and in other <br />i cases temporary ditches will be used to divert runoff from <br />disturbed areas to sediment ponds. Specifications for all temporary <br />diversions within the permit area are presented within Exhibit 7, <br />Hydrology Information. Temporary diversions will be constructed to <br />pass at a minimum the runoff from the precipitation event with a <br />two year recurrence interval. <br />The temporary diversions described above will have the purpose of <br />reducing contribution of suspended solids to runoff and diverting <br />undisturbed drainage from the mining area. The diversions will be <br />constructed with a minimum gradient to pass the design flow and <br />will be revegetated with grasses. If not removed by mining, upon <br />completion of mining and at an appropriate point mandated in the <br />Coal Regulations of the Colorado Mined Land Reclamation Board, the <br />temporary diversions will be reclaimed as required in Section <br />4.05.17. <br />4.05.4 Stream Channel Diversions (Relocation of Streams) <br />A permanent diversion constructed at the operation is used to <br />divert surface runoff from the watershed upslope of the Streeter <br />Fill as detailed in Section 2.06.2. The diversion structure was <br />designed to pass safely the 100-year, 24-hour precipitation runoff <br />event. This diversion, located on the north side of Streeter Fill, <br />is riprapped, as required, to control erosion. Design criteria <br />for the permanent diversion structure along with engineering <br />parameters for Streeter Fill are set forth in Exhibit 12, <br />Experimental Practice Information. The permanent diversion <br />structures will remain, but will not provide additional contri- <br />butions of sediment load to Good Spring Creek as they are designed <br />to safely pass the 100-year, 24-hour precipitation runoff and are <br />stabilized with riprap. A temporary diversion of Taylor Creek was <br />approved as a Technical Revision on November 19, 1984. The <br />diversion is shown on the Existing Structures-North Map (Map 21), <br />explained in detail in Exhibit 17, .Haul Road and Facilities <br />Modifications associated with Colowyo's Raw Water Supply Plan. <br />All temporary diversions will be removed and reclaimed when no <br />longer needed for sediment control in accordance with the <br />Operations and Reclamation Plan described in 2.05.4. <br />• <br />4.05-4 <br />