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RULE 4 PERFORMANCE STANDARDS <br /> t+. cam,- raaS.Ya�c•r,�exm ahc3 .•.:" >*** •.. s2t.+i » stsu +. :3xk:"a '1�,- a'�+ c,oc, <br /> 4.05 HYDROLOGIC BALANCE <br /> 4.05.1 General Requirements <br /> The surface mining activities at Colowyo have been planned and will be conducted to minimize <br /> changes in the prevailing hydrologic balance, in both the permit and adjacent areas, and to prevent <br /> long term adverse changes in the balance that might result from the activities <br /> As a preliminary step in minimizing adverse changes, hydrologic baseline information has been <br /> and is being collected, compiled and analyzed. The baseline monitoring programs are outlined in <br /> Section 2.04.7. This data provides detailed information on quality and quantity of surface water, <br /> drainage patterns, and geology. The description of the current hydrologic monitoring program is <br /> included in the following pages and results of the current monitoring program are included in the <br /> annual reports. In addition, Section 2.05.6 details the specific mining and reclamation techniques <br /> which Colowyo will implement to minimize changes to the hydrologic balance. <br /> The post-mining land use as described in detail under Section 2.05.5, will be rangeland. Changes <br /> in the hydrologic balance will be minimized so that the post-mining land use will not be adversely <br /> affected. <br /> Water quality standards and effluent limitations at the existing mining operation are regulated by <br /> the U. S. Environmental Protection Agency and the Colorado Department of Health. under the <br /> terms of an NPDES Permit, (See Exhibit 7, Hydrological Information), and by the Coal <br /> Regulations of the Colorado Mined Land Reclamation Board. The applicable effluent limitations <br /> will be met by using treatment methods which will include prompt revegetation, minimizing <br /> disturbed areas, sediment retention, use of contour furrows, terraces, sediment ponds and, if <br /> necessary, strategically placed energy dissipaters, such as riprap,check dams,mulches, filters and <br /> dugouts. Water quality control measures are discussed in 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 <br /> areas so as to bypass the disturbed areas rather than using treatment facilities. The principal <br /> technique to be used for this purpose will be diversion ditches. These diversion ditches are shown <br /> on Map 12, and discussed in detail under Section 2.05.6. Their design is specified in Exhibit 7, <br /> Hydrological Information. <br /> No acid-forming materials are present in the area to be mined which would require selective <br /> placement and sealing of overburden. The chemical characteristics of the overburden is presented <br /> under Section 2.04.6. The overburden sampling program is presented under Section 2.05. Results <br /> of the current overburden sampling program are presented in the Annual Reclamation and <br /> Hydrology Reports beginning in 1983 to the present. <br /> As discussed in Section 2.05.4, Colowyo will use various surface manipulation techniques on the <br /> topsoil after its redistribution as one method to prevent excessive wind or water erosion. <br /> No special treatment of coal processing waste is necessary since none will be produced. See <br /> Section 4.10 and 4.11. <br /> Rule 4 Performance Standards 4-7 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />