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•- TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />m <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br />September 2, 2016 <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 ED <br />RE: Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Minor Revision No. 161 <br />Monitoring Wells <br />Dear Mr. Trujillo, <br />SU 312 11 <br />OF DIVIMINING AND SWE['(ON <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 161 (MR -161) to Permit No. C-1981-019. <br />Per permit Stipulations 18 and 21, issued under the proposed decision for permit revision <br />04 (PR -04) on August 8, 2016, Colowyo is required to drill two monitoring wells identified as <br />MLC -04-02 and the Trout Creek Well. MR -161 provides a final location for the Trout Creek <br />Well on Map IOB and updates the groundwater monitoring plan accordingly. The location for <br />MLC -04-02 was previously provided on Map l OB during the adequacy review for PR -04. <br />The reclamation cost estimate (RCE) for PR -04 did not include cost information to plug <br />and abandon the Trout Creek Well or MLC -04-02. Therefore, it is requested that the Division <br />calculate this cost. The Trout Creek Well is estimated to be 1200' deep with a 8 %2" hole <br />diameter. MLC -04-02 is estimated to be 60' deep with a 5'/4" hole diameter. <br />As required by Stipulation 18 and 21, once the monitoring wells are installed, a minor <br />revision to the permit will be submitted to provide a complete description of the wells. This <br />information will be provided as required no more than 90 days after the wells are completed. <br />AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy'Coopemtive <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />V.O. BOX 1307 P.O. Box 577 P.O. BOX 698 <br />CRAIG, CO 81626.1307 PREWFrr, NM 87045 NUCLA. CO 81424-0698 <br />970424-4411 505-972-5200 970-864-7316 <br />