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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION_ , INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 <br />July 24, 2017 <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 />Minor Revision No. 177 <br />Topsoil Depth Testing Program - Collom <br />Dear Mr. Trujillo, <br />RECEIVED <br />JUL 2 6 2017 <br />Division of Reclamation, <br />Mining & Safety <br />303-452-6111 <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 />minor revision 177 (MR -177) to Permit No. C-1981-019. <br />MR -177 proposes a topsoil depth testing program to define the overall topsoil depths that <br />will be encountered within the footprint of the temporary out of pit spoil pile at Collom. The <br />data will be utilized to create a topsoil model to further define topsoil volumes that will be <br />encountered during stripping activities, and provide volumes to refine designs for future topsoil <br />stockpile configurations. <br />Also included in this minor revision are a revision application and a change of index <br />sheet to ease incorporation of this revision into the permit document. If you should have any <br />additional questions or concerns please feel free to contact Tony Tennyson at (970) 824-1232 at <br />your convenience. <br />Sincerely, <br />Daniel J. C iraro <br />Senior Manager <br />Environmental Services <br />DJC:TT:der <br />Enclosure <br />cc: Jennifer Maiolo (BLM-LSFO) <br />AN EQUAL OPPORTUNITY/AFFIRMA7IVEACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A Touchstone Energy' Cooperative KltT CRAIG, CO 81626.1307 PREWITT, NM 87045 NUCLA, CO 81424-0698 <br />970-824-4411 505-876.2271 970-864.7316 <br />