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RULE 4 PERFORMANCE STANDARDS <br />• The only stream channels that will be impacted by the South Taylor pi[ aze headwaters tributazy to Taylor <br />Creek and West Fork Good Spring Creek, which are intermittent and drain watersheds less than one <br />square mile. There will be no upstream diversions of these streams since mining will extend to the top of <br />the drainages. The headwaters systems will be restored to historic drainage pattems once temporary <br />diversion ditches are removed; therefore, there will be no permanent diversions of these channels. <br />4.05.4 Stream Channel Diversions (Relocation of Streams) <br />No diversions of perennial streams or streams that drain watersheds that are greater than or equal to one <br />square mile in size are planned or provided for at this time. The stream channels of Good Spring and <br />Wilson Creeks will be maintained in their natural positions. <br />4.05.5 Sediment Control Measures <br />Sediment control measures to be implemented are shown in Erosion and Sediment Control Structures <br />(Exhibit 7 Item 20). These facilities, consisting primarily of diversion ditches and sedimentation ponds, <br />will be located, constructed and maintained to avoid erosion and increased contribution of sediment load <br />to runoff. <br />Facilities to control sediment are typically installed in azeas above and/or below the planned sites of <br />disturbance. "Upstream" facilities, such as temporary diversion ditches and check dams upslope from the <br />mining activities, serve to divert runoff away from the disturbed azeas. Because South Taylor mining <br />activities cover the top of the drainages, no upstream facilities are proposed. Temporary diversion ditches <br />below the disturbed area will help collect runoff from disturbed azeas and route it into the sedimentation <br />. ponds. During active mining, the mining areas will aid in retaining sediment within the disturbed areas by <br />catching water in pits, small depressions and dozer basins, etc. This captured water and sediment will not <br />leave the mining areas. Once reclaimed, the basins will drain as they did prior to mining activities (i.e., <br />historic drainage patterns will be re-established). <br />All temporary diversions will be removed and reclaimed when no longer needed for sediment control in <br />accordance with the Operations and Reclamation Plan described in 2.05.4. <br />Channel lining rock riprap and energy dissipaters will be used when necessary. As stated above, all <br />temporary diversion structures will be seeded and revegetated. Colowyo does not anticipate that there <br />will be any significant excess material resulting from the construction of diversion ditches. <br />None of the proposed diversions will drain into underground mines. <br />• <br />Sou[h Taylor/Lgwer Wilson -Rule 4, Page 6 Revision Date: 11/30/06 <br />Revision No.: PR-02 <br />