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Colowyo PR3 adequacy response memo 3 April 21, 2011 <br />use clean water diversions above topsoil stockpiles? <br />2. The response is inadequate. In addition to topsoil stockpiles, other small disturbed <br />areas in the mine plan do not report to sediment ponds. Please provide a <br />demonstration that the applicable effluent limits can be met using alternative sediment <br />control methods. <br />Rule 4.05.3 Diversions and Conveyances of Less than One Square Mile <br />1. Please explain the rational for construction of Porcupine Draw. Presence of a channel <br />in pre-mining topography is difficult to identify, and the channel appears to run along <br />the side of a hill. <br />2. Please explain the rational for construction of stations 0+00 to 20+00 of Elk Draw in <br />the southeast corner of Section 26. Presence of a channel in pre-mining topography is <br />difficult to identify, and the channel appears to run along the side of a hill. Connection <br />of the upper portion of Elk Draw with Bear Draw appears more appropriate. <br />3. Please explain the rational for construction of stations 0+00 to 32+00 of Bear Draw as <br />a permanent ditch. Making this reach temporary appears more appropriate. <br />4. The drainage areas for Tributary 3 and Upper Badger Draw (upper end above Deer <br />Draw, Section 30+00) appear to be incomplete on Map 41 B. Please review and <br />produce a revised Map 41 B with complete drainage areas. <br />5. A topographic drainage (no name) between Lower Badger and Little Collom is <br />apparent in the southwest quarter of Section 25. Concentrated flows will likely result, <br />and erosion problems could develop. Please review and revise as necessary. <br />Rule 4.05.4 Stream Channel Diversions/Relocations <br />More information is required for channel LCW, which is proposed as a vegetated <br />channel in the SEDCAD run. How will vegetation be established? What other means <br />will be used to prevent erosion per Rule 4.05.4(2)(a)? Also, see Rule 4.05.7 below. <br />Rule 4.05.5 Sediment Control Measures <br />The application is adequate with regard to this Rule. <br />Rule 4.05.6 Sedimentation Ponds <br />The response appears to be adequate, but the designs are related to issues discussed <br />below. <br />2. The response is adequate as "near source" ponds are planned to treat runoff from the <br />area near the Collom Lite Pit. However, as noted in Rule 2.05.6(3)(a), question