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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 />January 9, 2020 <br />Mr. Zach Trujillo <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Technical Revision No. 136 <br />Prospect Watershed & D2 Ditch <br />Dear Mr. Trujillo, <br />�iION <br />MINING AND SAFETY <br />Tri-State Generation and Transmission Association Inc. (Tri-State), is the parent <br />company to Axial Basin Coal Company, which is the general partner to Colowyo Coal Company <br />L.P. (Colowyo). Therefore, Tri-State on behalf of Colowyo is submitting three (3) copies of <br />technical revision 136 (TR -136) to Permit No. C-1981-019. <br />TR -136 proposes to add straight pipe spillways (in addition to the already constructed <br />emergency spillways) to EP 1 and EP2 stock ponds, reduces the overall contributing watershed to <br />Prospect Pond by approximately 7 acres, and proposes to add riprap lining to the D2 Ditch. <br />Included in this technical revision are a revision application, a proposed public notice, <br />and a change of index sheet to ease incorporation of this technical revision into the permit <br />document. If you should have any additional questions or concerns, please feel free to contact <br />Tony Tennyson at (970) 824-1232 at your convenience. <br />DJC:TT:der <br />Enclosure <br />cc: Jennifer Maiolo (BLM-LSFO) <br />Chris Gilbreath (via email) <br />Tony Tennyson (via email) <br />Angela Anlhem (3zia email) <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />AN f.H+a, tjr:,h'prrAxe-rF+1.3.5?asr; ,as. �:_,vrw•; ,r. ;� CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 677 P.O. BOX as <br />A Touchstone Energy' Cooperative CRAIG, CO 81626.1307 PREWITT, NM 87045 NUCIA, CO 81424-0696 <br />., 970.824.4411 505-876.2271 970.8647316 <br />