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Where practical, diversion methods will be used to change the flow of water from undisturbed areas so as to bypass the dis- • turbed area rather than using treatment facilities. No acid- or toxic-forming materials are present in the area to be mined which would require any special handling. No special treatment of coal processing waste will be necessary since none will be produced; See Sections 4.1 and 4.11. As discussed in Section 2.05.4, the Bear Coal Company will use mulch on the topsoil after its redistribution as one method to prevent excess wind or water erosion. The Bear Coal Company plans to have surface runoff from the disturbed area pass through a sedimentation pond. The sedimenta- tion pond is discussed in detail under Section 2.05.6 and its location is shown graphically on the Mine Facilities Map (Map 101. In addition to the mining, reclamation, and treatment methods described and referenced in this Section, further protection of the hydrologic balance will be established by an on-going plan for monitoring changes in surface quality and quantity. This monitoring plan is described in Section 2.04.7 on Page 2.04-30b and the monitoring locations are graphically shown on the Mine Facilities Map (Map 10). 4.05.2 Water Quality Standards and Effluent Limitations • The plan for protection and control of drainage and sediment described in Section 2.05.6 provides that surface drainage from the disturbed area within the permit area will be passed through a sedimentation control structure. This pond will be constructed and maintained to safely contain the volume design for a 10-year, .24-hour precipitation event. The quality of water and accumula- tion of sediment in this pond will be monitored periodically. In addition, grab samples of water will be collected from the pond and its discharge to measure the effectiveness in meeting the applicable Colorado and Federal Water Quality Standards. 4.05-2 Revised June 29, 1990