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RULE 4 PERFORMANCE STANDARDS <br />Upstream diversions are proposed for portions of Little Collom X, as discussed above. Temporary <br />diversion ditches below the disturbed area of both pits will help collect runoff from disturbed areas and <br />route it into the sedimentation ponds. During active mining, the mining areas will aid in retaining <br />sediment within the disturbed areas by catching water in pits, small depressions and dozer basins, etc. <br />This captured water and sediment will not leave the mining areas. Once reclaimed, the basins will drain <br />as they did prior to mining activities (i.e., historic drainage patterns will be re-established). <br />All temporary diversions will be removed and reclaimed when no longer needed for sediment control in <br />accordance with the Operations and Reclamation Plan described in 2.05.4. <br />Channel lining rock riprap and energy dissipaters will be used when necessary. As stated above, all <br />temporary diversion structures will be seeded and revegetated after removal. Colowyo does not anticipate <br />that there will be any significant excess material resulting from the construction of diversion ditches. <br />None of the proposed diversions will drain into underground mines. <br />4.05.6 Sedimentation Ponds <br />The location, design parameters, and detailed sedimentation calculations of all planned sedimentation <br />ponds are presented in Erosion and Sedimentation Control Plan (Exhibit 7, Item 23). Additional <br />information may be found in Exhibit 7, Item 26 (Collom Pond Design Maps). The design plans and <br />specifications for the sedimentation ponds are described in this section. All sedimentation ponds will be <br />located as close as practical to the areas to be disturbed. Steep terrain in the upper basins precludes <br />location of the ponds at the Collom Lite disturbance boundaries during the critical early phase of <br />operations, necessitating down -valley locations within and downstream of the Little Collom X footprint. <br />In later phases, in -pit ponds will be developed in Collom Lite. Other methods of sediment control will be <br />located on the reclaimed areas; these methods include the use of contour furrowing, contour drainage <br />ditches, chisel plowing, and revegetation. <br />Colowyo has specificially provided information regarding Rule 4.05.9(7) a thru e with respect to <br />the Little Collom Sediment Pond below. The following are references to locations where each of <br />these is addressed. <br />a. Vegetative, organic material removed, cut slopes flatter than 1:1 <br />Construction notes on Exh. 7, Item 26, Figure 1 require all organic and other <br />deleterious materials be removed prior to placing fill. Cut slopes for the <br />centerline trench are called out as 1:1 <br />b. Sod, large roots, other vegetative matter, frozen soil, mine processing waste not to be <br />included in fill material. <br />The above materials are satisfactorily excluded as "unacceptable" fill materials in <br />the notes on Exh. 7, Item 26, Figure 1. Mine -processing waste has been added <br />to the list of unacceptable materials. <br />Spread fill in loose lifts starting at the valley bottom, with compaction as per <br />approved plans <br />Collom — Rule 4, Page 7 Revision Date: 9/28/11 <br />Revision No.: PR -03 <br />