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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 26, 2018 <br />VIA Electronic Mail: Zach.Trujillo(d)state.co.us <br />Mr. Zach Trujillo <br />Environmental Protection Specialist <br />Division of Reclamation, Mining, & Safety <br />Coal Program Support Staff <br />1313 Sherman Street, RM 215 <br />Denver, Colorado 80203 <br />RE: First Quarter 2017 Discharge Monitoring Report Submittal <br />CDPS Permit #CO -0045161 <br />Colowyo Coal Company, LP — Colowyo Mine <br />DRMS Mine Permit #C-1981-019 <br />Dear Mr. Trujillo: <br />Enclosed is the Discharge Monitoring Report (DMR) for the Colowyo Coal <br />Company, LP. (Colowyo) — Colowyo Mine CDPS Permit No. CO -0045161 for the first <br />quarter of 2018. Tri-State Generation and Transmission Association, Inc. (Tri-State) is <br />the parent of Axial Basin Coal Company, which is the general partner of Colowyo Coal <br />Company, L.P. The enclosed first quarter DMRs were submitted electronically through <br />the EPA's NetDMR program. <br />If you have any questions about the enclosed reports, please contact Darlene <br />Crosby at 303-254-3185. <br />DJC:DC:der <br />Enclosure <br />cc: DRMS Representative, Denver, CO <br />Chantell Johnson (via email) <br />Tony Tennyson (via email) <br />File: G471 — 11.3(10)a -9a <br />Colowyo CF 21.1.2.2013 <br />AN EQUAL OPPORTUNTY/AFFIRMA77VEAC77ON EMPLOYER <br />A Touchstone Energy'Cooperative <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO 81626-1307 PREWnT, NM 87WS NUCLA, CO 814240W8 <br />970.8244411 505-972-5100 970-864-7316 <br />