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Colowyo, C1981-019, PR3 adequacy No. 2 18 April 22, 2011 <br />The response is inadequate. In addition to topsoil stockpiles, other small disturbed areas in the <br />mine plan do not report to sediment ponds. Please provide a demonstration that the applicable <br />effluent limits can be met.using alternative sediment control methods. <br />Rule 4.05.3 Diversions and Conveyances of Less than One Square Mile <br />The Division reviewed submittal of the revised mine plan. The following questions are a result of <br />review of the revised plan. <br />Please explain the rationale for construction of Porcupine Draw. Presence of a channel in pre- <br />mining topography is difficult to identify, and the channel appears to run along the side of a <br />hill. <br />2. Please explain the rationale for construction of stations 0+00 to 20±00 of Elk Draw in the <br />southeast corner of Section 26. Presence of a channel in pre-mining topography is difficult to <br />identify, and the channel appears to run along the side of a hill. Connection of the upper <br />portion of Elk Draw with Bear Draw appears more appropriate. <br />3. Please explain the rationale for construction of stations 0+00 to 32+00 of Bear Draw as a <br />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 Draw, <br />Section 30+00) appear to be incomplete on Map 41B. Please review and produce a revised <br />Map 41B with complete drainage areas. <br />5. A topographic drainage (no name) between Lower Badger and Little Collom is apparent in the <br />southwest quarter of Section 25. Concentrated flows will likely result, and erosion problems <br />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 channel in the <br />SEDCAD run. How will vegetation be established? What other means will be used to prevent <br />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