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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 />June 2, 2014 <br />RECEIVED <br />Mr. Rob Zuber JUN 0 5 2014 <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources Division of Reclamation, <br />1313 Sherman Street, Room 215 Mining &Safety <br />Denver, CO 80203 <br />RE: Colowyo Coal Company L.P., Mine Permit C- 1981 -019, Minor Revision No. 133 <br />(MR -133), Addendum to Exhibit 23, Item 1 <br />Dear Mr. Zuber: <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 />MR- 133 to Permit C- 1981 -019. <br />MR -133 provides an addendum to Exhibit 23, Item 1, to the report title, "Geotechnical <br />Design and Operational Considerations for Highwall Mining, South Taylor Pit G78 and E /D2 <br />Seams, and West Pit F, E, D2, and C Seams". The addendum is being provided to clarify that <br />the characteristics (pit, seam, mining height, cover depth) of the mining captured with the design <br />reports include Exhibit 23, Item 1 are met, that Colowyo can highwall mine within the mining <br />boundary delineated on approved Map 23. <br />Also included with this package are a revision application and a change of index sheet to <br />ease incorporation into the permit document. If you should have any additional questions or <br />concerns, please feel free to contact Chris Gilbreath at (303) 254 -3291. <br />BAW:TT:pvt <br />Enclosure <br />cc Kurtis Blunt (via email) <br />Chris Gilbreath (via email) <br />Tony Tennyson (via email) <br />"N r._ -;- 1 .'J'1 ; ACPON Et L` „;.6.? <br />A T ttch,n7nc Encr,_, Vooper mvc t <br />Sincerelv. <br />I� <br />Barbara A. Walz <br />Senior Vice President <br />Policy & Compliance/ <br />Chief Compliance Officer <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 PREWITT, NM 87045 NUCLA, CO 81424 -0698 <br />970- 824 -4411 505- 972 -5200 970 -864 -7316 <br />