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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />April 29, 2014 <br />Chris Gilbreath <br />Tri -State Generation and Transmission Association, Inc. <br />P.O. Box 33695 <br />Denver, CO 80233 -0695 <br />Re: Colowyo Mine (Permit No. C- 1981 -019), TR -102, adequacy letter <br />Dear Mr. Gilbreath: <br />We received your submittal for TR -102 on March 25, 2014. There are some items to be addressed before the <br />Division can approve this revision. The first item may be more important, but the others are predominantly <br />editorial. <br />1. In the time of concentration details for structure 42 (page 33 in the SEDCAD run) the vertical <br />distance is 15.5 feet. This appears to be inaccurate. Please revise the SEDCAD run or provide <br />an explanation regarding how this distance was measured. <br />2. In the Colowyo PAP, Exhibit 7, Item 14, Table 1 needs to be updated to show the revised design <br />parameters for West Pit Coal Road Ditch, including the bottom width. <br />3. The West Pit Coal Road Ditch is listed in the table of Temporary Side Channels (page Exh. 7- <br />14.-2 in the PAP). Please revise the table or explain why this ditch is listed in the table. <br />4. In the TR -102 submittal, on page Exh. 7 -1417-3 there is a reference to Figure 4. Should this be <br />Figure 3? <br />If you have any questions, please contact me at 303.866.3567 (extension 8113) or Rob.Zuberdstate.co.us. <br />Sincerely, <br />74— <br />Robert Zuber, P.E. <br />Environmental Protection Specialist <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http: / /mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />Colo <br />'f 1876 �` <br />