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• Drainage from the mining facility area, after treatment in the <br />sedimentation pond, is not anticipated to exceed the effluent <br />limitations of any Colorado agency requirements. No water is <br />anticipated to be discharged from the underground mine. Likewise, no <br />acid mine drainage of pH equal to or less than 6.0 is expected. To <br />date, no water has ever been discharged from the old workings of the <br />Peacok Coal Mine, even though mining has been conducted since 1905. <br />Historically, the Peacock Coal Mine has experienced no pH problems with <br />water sampled in the vicinity of the operations. As reported in Section <br />2.04.7, all pH values of water samples taken in the vicinity of Sunbelt <br />operations have ranged between 6.0 and 9.0; therefore, it is <br />anticipated that no acid drainage will occur as the operations move <br />westward into the block of coal found in Section 17. <br />4.05.3 Diversions and Conveyance of Overland Flow and Shallow <br />Groundwater Flow, and Ephemeral Streams Draining a Watershed <br />• Less Than One Square Mile <br />The drainage and sediment control plan described under Section 2.05.6, <br />provides for temporary diversion of surface drainages within the permit <br />area. Temporary ditches, as shown on the Drainage and Sediment Control <br />Plan Map (Map 6), will divert runoff out of disturbed areas and, in <br />other cases, be used to divert runoff from disturbed areas. Temporary <br />diversions will be constructed to pass runoff from the precipitation <br />event of a 10-year, 24-hour recurrence interval. <br />The temporary diversions will have the purpose of reducing contribution <br />of suspended solids to runoff in diverting undisturbed drainage from the <br />mining area. The diversions will be constructed with a minimum gradient <br />to pass the design flow and will be revegetated with grasses or lined <br />with appropriate riprap. Upon completion of mining and at an <br />appropriate point mandated in the Coal Regulations of the Colorado Mined <br />Land Reclamation Board, temporary diversions will be reclaimed as <br />. required in Section 4.05.17. Additional information on removal and <br />4.05-3 <br />