2011-01-10_REVISION - C1981019 (2)

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commitment to use surface roughening and contour furrows in the East Pit on revised page 2.05- 30. Rule 2.05.4 - Reclamation Plan This item is resolved. Colowyo has changed the wording on page 2.05-30 from contour furrows to contour ditches. Rule 2.10 - Mans and Plans 2. This item is resolved. Colowyo has modified the stock tank locations (and post-mining drainage channel locations) on Map 12 and in the SEDCAD figures to show their correct locations. 3. This item remains outstanding. Map 12 - Hydrology, South Area, shows reclamation that has been completed at the Colowyo Mine as it relates to backfilling and grading and post-mining channel construction. Given the ongoing and continual nature of the reclamation at the Colowyo Mine, this map will never be a completely accurate representation of what is actually reclaimed on the ground except for at one specific point in time. The map does, however, need to be accurate for any given reclamation year. The Division has requested that this map be submitted as a Minor Revision to the permit each spring to show the reclamation that has occurred to date. In the 8 November 2010 responses, Colowyo states its desire to submit the updated Map 12 with the Annual Reclamation Report. Submitting the revised Map 12 with the Annual Reclamation Report would not provide for a mechanism to incorporate the revised map into the permit document, as the Annual Reclamation Report is a report that, while a part of the record, is not a part of the permit document. A revised copy of Map 12 will need to be submitted as a Minor Revision to the permit each spring. Rule 4.05.4 - Stream Channel Diversions and Stream Channel Reconstruction 4. The narrative on revised page Exh.7-14R-3 discusses the use and design of temporary ditches to divert runoff from spoil and reclaimed areas to the unreclaimed East Pit. These temporary ditches result in areas that'are excluded from producing runoff in the SEDCAD modeling for the Prospect Pond. The text narrative references Figure Exh.7- 14R-7 and states that the ditches are "short term in nature and will be removed as reclamation progresses." Figure Exh.7-14R-7 shows one of the ditches extending a significant distance northeast into previously reclaimed areas. Please explain in more detail in the narrative on revised page Exh.7-14R-3 how and when these ditches will be constructed and used and when each ditch will be removed or reclaimed. 5. Currently approved permit page Exh.7-14132 (revised 25 July 2006, TR-63) shows the approved design information for the Final East Pit Ditch and the Prospect Ditch permanent channels. Proposed SEDCAD design runs for the 10-year, 24-hour storm event for the Prospect Pond result in new design information for the Final East Pit Ditch and Prospect Ditch that would appear to supersede the currently approved information on page Exh.7-14D2. Please review the designs for the Final East Pit Ditch and the Prospect Ditch and submit new permanent channel design information that is consistent with the SEDCAD modeling submitted with Technical Revision 87 for these two ditches.