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2025-07-30_PERMIT FILE - C1981019 (7)
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2025-07-30_PERMIT FILE - C1981019 (7)
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Last modified
8/12/2025 2:53:20 PM
Creation date
8/12/2025 2:50:10 PM
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Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Permit File
Doc Date
7/30/2025
Section_Exhibit Name
Rule 4 Performance Standards -ST
Media Type
D
Archive
No
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RULE 4 PERFORMANCE STANDARDS <br /> <br />South Taylor – Rule 4, Page 3 Revision Date: 7/21/25 <br /> Revision No.: MR-267 <br /> <br /> <br /> <br />4.05.2 Water Quality Standards and Effluent Limitations <br /> <br />Please see Section 4.05.2 in Volume 1. <br /> <br />4.05.3 Diversions and Conveyance of a Watershed Less than One Square Mile <br /> <br />The drainage and sediment control measures described under Section 2.05.6 and presented in Erosion and <br />Sediment Control Structures (Exhibit 7, Item 20) provides for temporary diversion of surface drainages within <br />the permit area. A system of temporary ditches will be used to divert runoff from disturbed areas to sediment <br />ponds. Temporary diversions will be constructed to pass at a minimum the runoff from the precipitation <br />event with a two-year recurrence interval. <br /> <br />The temporary diversions drain watersheds less than one square mile in size and serve to reduce the <br />contribution of suspended solids to runoff. The diversions will be constructed with a minimum gradient to <br />pass the design flow and will be stabilized with grasses or riprap. If not removed by mining, upon completion <br />of mining and at an appropriate point mandated in the Coal Regulations of the Colorado Mined Land <br />Reclamation Board, the temporary diversions will be reclaimed as required in Section 4.05.17. <br /> <br />The only stream channels that will be impacted by the South Taylor pit are headwaters tributary to Taylor <br />Creek and West Fork Good Spring Creek, which are intermittent and drain watersheds less than one square <br />mile. There will be no upstream diversions of these streams since mining will extend to the top of the <br />drainages. The headwaters systems will be restored to historic drainage patterns once temporary diversion <br />ditches are removed; therefore, there will be no permanent diversions of these channels. <br /> <br />4.05.4 Stream Channel Diversions (Relocation of Streams) <br /> <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 Wilson <br />Creeks will be maintained in their natural positions. <br /> <br />4.05.5 Sediment Control Measures <br /> <br />Sediment control measures to be implemented are shown in Erosion and Sediment Control Structures (Exhibit <br />7 Item 20). These facilities, consisting primarily of diversion ditches and sedimentation ponds, will be <br />located, constructed and maintained to avoid erosion and increased contribution of sediment load to runoff. <br /> <br />Facilities to control sediment are typically installed in areas 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 areas. Because South Taylor mining <br />activities cover the top of the drainages, no upstream facilities are necessary. Temporary diversion ditches <br />below the disturbed area will help collect runoff from disturbed areas 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 /> <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 />
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