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TRI -STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233 -0695 303- 452 -6111 <br />May 7, 2014 <br />RECEIVED <br />Mr. Robert Zuber <br />Environmental Protection Specialist MAY 0 9 2014 <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources Division of Reclamation, <br />1313 Sherman Street, Room 215 Mining & Safety <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P., Mine Permit C -81 -019, Technical Revision No. 102, <br />West Pit Coal Road Ditch, Adequacy Response <br />Dear Mr. Zuber: <br />Tri-State Generation and Transmission Association, Inc. (Tri- State) is submitting the <br />enclosed adequacy responses for Technical Revision 102 (TR -102) on behalf of Colowyo Coal <br />Company L.P. (Colowyo). Tri -State is the parent company to Axial Basin Coal Company, which <br />is the general partner to Colowyo Coal Company L.P. (Colowyo). The Colowyo Mine operates <br />under Colorado Division of Reclamation Mining and Safety (CDRMS) Permit No. C- 1981 -019. <br />Tri -State received your adequacy letter, dated April 29, 2014 and is providing the <br />following responses to your adequacy comments for TR -102: <br />1. In the time of concentration details for structure #2 (page 33 in the SEDCAD run) the <br />vertical distance is 1 5.S.feet. This appears to be inaccurate. Please revise the SEDCAD run or <br />provide an explanation regarding how this distance was measured. <br />Response: The horizontal distance (time of concentration) for structure #2, lower portion of the <br />West Pit Coal Road Ditch, had a typographical error in it. This has been corrected and the <br />revised SEDCAD run has been included. With this correction, the time of concentration was <br />slightly lowered for this portion which incurs a slight increased peak flow. Therefore, the lower <br />segment of the West Pit Coal Road Ditch total depth also increased from 1.80 ft. to 1.94 ft. <br />2. In the Colowyo PAP, Exhibit 7, Item 14, Table I needs to be updated to show the revised <br />design parameters for West Pit Coal Road Ditch, including the bottom width. <br />Response: Exhibit 7, Item 14. Table 1 has been updated as requested <br />3. The West Pit Coal Road Ditch is listed in the table of Temporary Side Channels (page <br />Exh. 7 -14B -2 in the PAP). Please revise the table or explain why this ditch is listed in the table. <br />Respomse: The Temporary Side Channel Table on page Exh. 7 -1413-2 is a historical table that <br />lists many of the temporary side ditches constructed at the Colowyo Mine. That being said, the <br />West Pit Coal Road Ditch parameters have been removed from the table. <br />AN EQUAL OPPORTUNITY i AFFIRMATIVE ACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />1 P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A Touchstone Ent t�� }' �.- OU(1l'fBClb'l' 1, CRAIG, CO 81626 -1307 PREWITT, NM 87045 NUCLA, CO 81424 -0698 <br />���, \ \ \ \���` ^„ 970.824 -4411 505.972 -5200 970 -864 -7316 <br />