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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />12 May 2008 <br />Mr. Ryan Pawlowski <br />Colowyo Coal Company, LP <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />Re: Colowyo Mine C-1981-019 <br />Preliminary Adequacy Review -Technical Revision 71 <br />Dear Mr. Pawlowski: <br />COLORADO <br />DIVISION O F <br />RECLAMATION <br />MINING <br />-&- <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />The Division has received Colowyo's 2 April 2008 Submittal of Technical Revision 71 - <br />the Section 16 Pond ditch extension. The revision was deemed complete on 10 April <br />2008 and the proposed decision date is 9 June 2008. The Division has reviewed the <br />submittal and has the following questions. <br />Rule 4.05.9(2) requires the applicant demonstrate that the 25-year, 24-hour <br />storm event can be safely passed through the emergency spillway of an <br />impoundment (sediment pond). No SEDCAD design information was <br />provided for this larger storm event. Please provide the necessary <br />information to comply with Rule 4.05.9(2) for the Section 16 pond. <br />2. Pages Exh.7-140-2 and Exh.7-140-3 are Figurel and Figure 2, respectively. <br />The legend on these figures appears to incorrectly identify the Section 16 <br />Pond ditch as the permit boundary. Please review these figures and correct <br />the legends on these two figures to accurately represent information. <br />3. On the currently approved Exhibit 7, Item 140, Figures 1 and 2, there are two <br />sediment traps shown. These sediment traps are named Section 16 Sediment <br />Trap 1 and 2. These two sediment traps do not appear on the revised Figures <br />1 and 2. Please either replace the sediment traps on the Figures or <br />explain why they are no longer needed. <br />4. It is the Division's understanding that Colowyo is extending and reconfiguring <br />the Section 16 Pond ditch to capture runoff from the disturbed area until such <br />Office of Office of <br />Mined Land Reclamation Denver Grand )unction Durango Active and Inactive Mines <br />