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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 11, 2015 <br />Mr. Brock Bowles <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 RECEIVED <br />RE: New Horizon North Mine SEP 14 2015 <br />Permit No. C-2010-089 <br />Technical Revision No. 10 (TR -10) Division ®t Reda""' <br />Adequacy Review No. 1 Response <br />mirtalMg � �y <br />Dear Mr. Bowles: <br />Tri-State Generation and Transmission Association, Inc. (Tri-State) has received your adequacy <br />review letter for TR -10, dated August 21, 2015 and provides the following responses on behalf of <br />Western Fuels -Colorado, A Limited Liability Company (WFC) New Horizon North Mine. <br />1. The Lambert and Associates ' geotechnical report provided two 'moist' unit weights but it <br />appears that the pond embankment is homogeneous. It is assumed that this is a typo and that one <br />of the numbers is the dry density weight. Please clarify why two `moist' soil weights were <br />provided. <br />Response: Additional description has been provided to denote the ASTM Methods utilized to <br />determine the compaction percentage, and to clarify the two moist soil weights that are provided. <br />The two moist soil weights are not a typo as indicted by the Division. <br />Included in this adequacy response package are revised materials in response to your adequacy <br />comments and a change sheet index to assist with incorporating the revised materials into the permit <br />document. If you have any questions regarding the enclosed adequacy review responses, please contact <br />Tony Tennyson at 970-824-1232 or ttenn- sonktristateO.org. <br />DJC:TT:pvt <br />Enclosures <br />cc: Frank Ferris (via email) <br />Chris Gilbreath (via email) <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative t <br />'\\S^in`c\erely, <br />Daniel J. Casi � o <br />Senior Manager <br />Environmental Services <br />Jason Storey (via email) <br />Tony Tennyson (via email) <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 />