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RULE 4 PERFORMANCE STANDARDS <br />Water quality standards and effluent limitations at the existing mining operation aze regulated by the U. S. <br />Environmental Protection Agency and the Colorado Department of Public Health and Environment under <br />the terms of an NPDES Permit, (See Exhibit 7, Hydrological Information), and by the Coal Regulations <br />of [he Colorado Mined Land Reclamation Board. The applicable effluent limitations will be met by using <br />Vea[ment methods that will include prompt revegetation, minimizing disturbed areas, sediment retention, <br />use of contour furrows, terraces, sediment ponds and, if necessary, strategically placed energy dissipaters, <br />such as riprap, check dams, mulches, filters and dugouts. Water quality control measures are discussed in <br />detail under Section 2.05.4 and 2.05.6. <br />Where practicable, diversion methods will be used to change the flow of water from undisturbed azeas so <br />as to bypass the disturbed areas rather than using treatment facilities. The principal technique to be used <br />for this purpose will be diversion ditches. These diversion ditches are located on Maps 11 and 12 and <br />discussed in detail under Section 2.05.6. Their design is specified in Exhibit 7, Hydrological Information. <br />No acid-forming materials are present in the area to be mined which would require selective placement <br />and sealing of overburden (Exhibit 6). The chemical characteristics of the overburden is presented under <br />Section 2.04.6. The overburden sampling program is presented under Section 2.05. Results of the current <br />overburden sampling program are presented in the Annual Reclamation and Hydrology Reports beginning <br />in 1983 to the present. <br />As discussed in Section 2.05.4, Colowyo will use various surface manipulation techniques on the topsoil <br />after its redistribution as one method [o prevent excessive wind or water erosion. <br />No special treatment of coal processing waste is necessary since none will be produced. See Section 4.10 <br />and 4.11. <br />Colowyo plans to have all surface runoff from the disturbed areas pass through sedimentation ponds. <br />Sedimentation ponds are discussed in detail under Section 4.05.6, and their locations are shown <br />graphically on the mine plan map (Map 23A). <br />Colowyo employs various methods to manage water which periodically collects internal to the mining <br />operation and does not reach sedimentation ponds. Vazious sumps, ditches, pumps, hoses and pipes, etc. <br />will be employed to control water within pits and/or route water between pits. The ultimate destination of <br />such water will be for operation's use (i.e. dust control), evaporation, or seepage into the backfilled spoil <br />areas. <br />In addition to the mining, reclamation, and treatment methods described and referenced in this Section, <br />further protection of the hydrologic balance will be established by an on-going plan for monitoring <br />potential changes in surface water quality and quantity and groundwater quality. This monitoring plan is <br />described under Section 4.05.13 and the monitoring locations aze graphically shown on Map 10A. Excess <br />spoil valley fill areas aze located up-dip from mining and reclamation areas and periodic monitoring for <br />seeps and springs and periodic monitoring of piezometer wells will detect the formation of spoil springs. <br /> <br />Souti~ Taylor/Lower Wilson -Rule 4, Page 4 Revision Date: 1 I/30/06 <br />Revision No.: PR-02 <br />