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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 />April 27, 2015 <br />Mr. Brock Bowles <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />RECEIVED <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />APR 2 8 2015 <br />RE: New Horizon Mine (Permit No. C- 1981 -008) <br />Division of Reclamati <br />Technical Revision No. 68 (TR -68) <br />Mining &Safety on, <br />Completeness Review Response <br />Dear Mr. Bowles: <br />Tri -State Generation and Transmission Association, Inc. (Tri- State) has received your <br />completeness review letter for TR -68, dated April 2, 2015 and provides the following response on behalf <br />of Western Fuels - Colorado, A Limited Liability Company (WFC) New Horizon Mine. <br />4.05.2 - Water Quality Standards and Effluent Limitations <br />1. Sediment control measures were not addressed for the Calamity Draw pump station. All other <br />structures proposed for the stream buffer zone variance in TR -68 meet the requirements of Rule <br />4.05.2(4) and do not need sediment control measures. <br />Response: WFC has provided a SEDCAD sedimentology demonstration to show that the <br />undisturbed vegetation surrounding the Calamity Draw pump station acts as a grass filter and that <br />sedimentation ponds or other treatment facilities are not necessary for the drainage to meet the <br />effluent limitations of 4.05.2. In accordance with Rule 4.05.2(3)(a), this demonstration meets the <br />criteria for an exemption from the requirements of 4.05.2. <br />Included in this completeness response package is revised material in response to your <br />completeness comments, and a change sheet index to assist with incorporating the revised material into <br />the permit document. If you have any questions regarding the enclosed adequacy review responses, <br />please contact Tony Tennyson at 970 - 824 -1232 or ttennysongtristategtt.org. <br />(Sincerely, <br />Chris S. Gilbreath <br />Manager <br />Water, Waste and Mining Compliance <br />CSG:TT:pvt <br />Enclosure <br />AN EQUAL OPPORTUNITYlAFFIRMATIVE ACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A Touchstone Energv'COoperative r CRAIG, CO 81626 -1307 PREWrfT, NM 87045 NUCLA, CO 81424 -0698 <br />\� 970- 824 - 4411 505 -972 -5200 970 -864 -7316 <br />