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RULE 4 PERFORMANCE STANDARDS <br /> 4.21.4 Performance Standards <br /> No habitats of unique value for fish, wildlife, and other related environmental values and areas <br /> were identified in Section 2.05.6(2)(b), which could be affected by coal exploration work. <br /> During any coal exploration, Colowyo will obtain any supportive information that might be <br /> necessary for proper mining, reclamation and environmental control. <br /> All vehicular traffic will be limited to established,graded roads at all times, except in cases where <br /> limited off road travel will be less damaging to vegetation and the ground surface than the <br /> construction of a new road. Travel will be confined to graded surface roads during periods when <br /> excessive damage to vegetation or rutting of the land surface could occur. <br /> Any new road to be built for the exploration project will be utilized for less than six months and <br /> thus will be constructed as a light use road according to the provisions of Section 4.03.3. <br /> Any existing roads in the area will be altered for exploration purposes only so far as they may be <br /> widened or smoothed to accommodate exploration equipment and in accordance with all <br /> applicable Federal, State and local requirements. Water bars and ditches will be added where <br /> appropriate. All existing roads to be used during the exploration program will be left in the <br /> condition that is superior to their pre-exploration condition. <br /> Any drill sites that are no longer needed for exploration or environmental monitoring (such as <br /> piezometer wells) will be returned to their approximate original contour promptly after all coal <br /> exploration activities are completed. <br /> Topsoil will be removed prior to construction of any drill site when necessary. After the site is <br /> recontoured, topsoil will be redistributed over the surface in a manner that will provide for <br /> successful reclamation. If any exploration drilling is to be conducted in an area directly ahead of <br /> the mining operations where topsoil has been removed, the site will be mined through and <br /> reclaimed in accordance with Section 2.05.4. <br /> Revegetation of drill sites and roads will be performed by drill or by broadcast seeding with a <br /> variety of native and introduced species during the late fall or early spring to produce a satisfactory <br /> vegetative cover capable of stabilizing the soil surface.The affected areas will be seeded according <br /> to the mixture described in Section 2.02. <br /> In no case will any ephemeral, intermittent or perennial stream be diverted during the exploration <br /> activities. Overland flow will be diverted, if necessary, so that erosion is controlled by ditches, <br /> water bars, sedimentation ponds or other methods capable of controlling erosion and minimizing <br /> additional contributions of suspended solids in the stream flow outside the exploration area. Such <br /> diversions will be done in a manner that complies with all other applicable Federal and State <br /> requirements. <br /> Rule 4 Performance Standards 4-72 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />