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• Where practical, diversion methods will be used to change the flow of <br />water from undisturbed areas so as to bypass the disturbed area rather <br />than using treatment facilities. The principal technique to be used for <br />this purpose will be diversion ditches. These ditches are located on <br />the Drainage and Sediment Control Plan Map (Map 6). <br />No acid- or toxic-forming materials are present in the area to be mined <br />which would require any special handling. No special treatment of coal <br />processing waste will be necessary so none will be produced; See <br />Sections 4.1 and 4.11. As discussed in Section 2.05.4, Sunbelt will use <br />mulch on the graded area as one method to prevent excess wind or water <br />erosion. <br />Sunbelt plans to have surface runoff from the disturbed area pass <br />through a sedimentation pond. The sedimentation pond is discussed in <br />detail under Section 2.05.6 and its location is shown graphically on the <br />Drainage and Sediment Control Plan Map (Map 6). <br /> <br />4.05.2 Water Quality Standards and Effluent Limitations <br />The plan for protection and control of drainage and sediment described <br />in Section 2.05.6 provides that surface drainage from the disturbed area <br />within the permit area will be passed through a sedimentation control <br />structure. This pond will be constructed and maintained to safely <br />contain the volume design for a 10-year, 24-hour precipitation event. <br />The quality of water and accumulation of sediment in this pond will be <br />monitored periodically. In addition, grab samples of water will be <br />collected from the pond and its discharge to measure the effectiveness <br />in meeting the applicable Colorado and Federal Water Quality Standards. <br />The proposed sedimentation pond has been designed and will be <br />constructed and maintained to effectively trap sediment from runoff <br />resulting from a 10-year, 24-hour precipitation event. <br /> <br />4.05-2 <br />