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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 />September 28, 2017 <br />Mr. Brock Bowles RECEIVED <br />Environmental Protection Specialist OCT 0 2 2017 <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 Division of Reclamation, <br />Mining & Safety <br />RE: New Horizon Mine (Permit No. C-1981-008) <br />Technical Revision No. 83 (TR -83) <br />Alternate Sediment Control Demonstration (GW46 Trust Property) <br />Dear Mr. Bowles: <br />Tri-State Generation and Transmission Association (Tri-State) is submitting the enclosed <br />"Application Form for a Revision to a Coal Mining and Reclamation Permit" for a technical <br />revision application on behalf of the Elk Ridge Mining and Reclamation's (ERMR) New <br />Horizon Mine. Tri-State is the parent company of ERMR. The New Horizon Mine operates <br />under the Division of Reclamation, Mining and Safety (DRMS) Permit No. C-1981-008. <br />Technical Revision No. 83 (TR -83) provides an effluent demonstration in Attachment <br />2.05.3(3)-37 for alternate sediment control using a grass filter for 4.5 acres of Irrigated Pasture <br />on GW46 Trust property. <br />Also enclosed please find a revision application and a change of index sheet to ease <br />incorporation of these materials in to the permit. If you have any questions about the enclosed <br />technical revision, please contact Tony Tennyson at (970) 824-1232 or ttennyson(&tristategtt.org. <br />Sincerely, <br />Daniel J. Casiraro <br />Senior Manager <br />Environmental Services <br />DJC:JS:der <br />Enclosures <br />cc: Frank Ferris (via email) <br />Chris Gilbreath (via email) <br />Jason Storey (via email) <br />Tony Tennyson (via email) <br />File: G474 -11.3(21)b-4 <br />AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />A Touchstone Energy'C',00peraNve CRMG. CO 81626.1307 PREWRT, NM 87015 NULL k CO 81421.0636 <br />�..� 970-821-1111 506-972-5200 970.864-7316 <br />