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Fourth Adequacy Response 112(d)-1 Application, Amended CN-01 <br />Wildcat Mining Corporation May Day Idaho Mine Complex <br />Appendix A Chief Drainage Channel Reclamation Best Management Practices: <br />15. The second, third, and fourth BMP sheets suggest pipes or culverts are proposed as part <br />of the reclamation channel design. Please indicate where pipes or culverts are to be used <br />on Figures 1 and 2. <br />Comment: CMP will be used to enter the Chief Portal. No drainage culverts are <br />proposed under the proposed drainage option. An option to use a culvert to convey <br />the 10 year 24 hour storm beneath the mine rock was considered. <br />16. The mulch BMP sheet (page 111) mentions hay. Hay is not allowed as stated in <br />Comment #5. Also note that mulch is most suitable for flat or gently sloping areas, as <br />stated in the second paragraph of the mulch BMP. This site has very little flat or gently <br />sloping areas. <br />Comment: Reference to "hay" will be replaced with "wattles." <br />17. There is a vegetative filter BMP included (p. 121). Note these are grassy areas and it <br />may not be feasible to establish a good stand of grass to perform as a filter. Where is the <br />vegetative filter to be implemented? If it is not to be used, please remove it from <br />Appendix A. <br />Comment: Vegetation will be left where possible and not disturbed during channel <br />reconstruction activities. <br />18. The silt fence barrier BMP sheet states silt fences can be used in minor swales or ditches <br />(p. 126). DBMS does not allow silt fences to be used in channels of any kind, <br />perpendicular to the flow direction. <br />Comment: Silt fences or wattles will be used at the interface between disturbed and <br />undisturbed areas. <br />6/6/2011 <br />15