2010-03-29_REVISION - C1981019 (3)

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fields northeast of County Road 17. This activity was not recommenced after the mass wasting events (1983-1984) disabled the functionality of the system. There are no plans to repair and put back into service this irrigation system in the future. • Colowyo contends that based on the descriptions and defining characteristics needed to classify an area as a functioning alluvial valley floor, the area proposed for disturbance associated with the Collom Access road in the area of the Lower Wilson Drainage no longer qualifies as an alluvial valley floor and should not require a material damage assessment, water monitoring program, etc., due to the fact the area is not a functional alluvial valley floor `pre-disturbance': Colowyo does however plan to return the area of disturbance to pre-disturbance condition at the cessation of mining activities. " Rule 3.02.2 - Determination of Bond Amount 19. Colowyo has not provided a reclamation cost estimate for the Collom area. The Division recognizes that in this case this is not a completeness issue, given the inevitable changes to the submittal. A detailed reclamation cost estimate will need to be submitted as the adequacy phase of the review draws to a close and all major on- the-ground issues that would affect the estimate have been resolved. There are several maps associated with the reclamation cost estimate that will need to be included with the submittal of the estimate. These maps are Map 35C-Bond Calculation Map Worst Case Topography, Map 36B-Bond Calculation Map Regraded Topography and Map 40B-Bond Calculation Cross Sections. None of these were included in the PR-03 application. Colowyo Response: Information will be provided during technical adequacy. Rule 4.05.2 - Water Quality Standards and Effluent Limitations 20. Rule 4.05.2(3) requires a demonstration that effluent limitations will be met for small areas. For stockpile areas as shown on Exhibit. 7, Itern 23, Figure A-1 outside primary sediment control capabilities, a demonstration that effluent limitations will be met for these areas is required Colowyo Response: Statement requiring a ring ditch and berm around all topsoil structures outside primary sediment control structures was added to Section 4.05.2(3). Rule 4.05.3 - Diversions and Conveyances of Less than One Square Mile 21. On page 107 of Section 4.05.3 Colowyo briefly states that they will be constructing temporary diversions of surface water within the permit area. There is, however, no information provided either in the text of Section 4.05.3 or in Exhibit 7, Item 23. Please provide descriptions, plans, channel profiles, maps and SEDCAD modeling for all proposed diversions within the permit area. Colowyo Mine C-1981-019 page 9 of 16 25 March 2010 Permit Revision 03 - Collom Permit Expansion