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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 />November 30, 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 <br />REED <br />RE: New Horizon 2 Mine <br />Permit No. C-1981-008 <br />Technical Revision No. 69 (TR -69) <br />Adequacy Review No. 1 Response ,,, ,,coamation, <br />N,,,,,jig & Safety <br />Dear Mr. Bowles: <br />Tri-State Generation and Transmission Association, Inc. (Tri-State) has received your <br />adequacy review letter for TR -69, dated November 18, 2015 and provides the following <br />responses on behalf of Western Fuels -Colorado, A Limited Liability Company (WFC) New <br />Horizon 2 Mine. <br />2.05.3(3) — Mine Facilities <br />1. On page 4, bullet f contains a list of ditches and culverts that are permitted as permanent. <br />This list is not complete and needs to be updated. Examples of missing ditches are Cl, <br />C4, C23, C24 and missing culverts 119 —124. Please update this list. <br />Response: The list of ditches and culverts that are permitted as permanent has been <br />updated. <br />2. Table 2.05.3(3) -IA Curve Numbers from October 1, 2015 to Present has been added to <br />the text. The curve numbers are different from the currently approved Table 2.05.3(3)-1. <br />Please explain the purpose of Table 2.05.3(3)-]A, how it will be utilized, and if the new <br />table will supersede the current Table 2.05.3(3)-1. <br />Response: In the approved PAP, curve numbers in Table 2.05.3(3)-1 were erroneously <br />transposed from the USDA-NRCS TR -55 document. For example, values from <br />Hydrologic Soil Group D were shown for Soil Group C, values from Soil Group C were <br />shown for Soil Group B, and values from Soil Group B were shown for Soil Group A. <br />This error in Table 2.05.3(3)-1 has been corrected in this revision application and these <br />corrected values were used to develop Table 2.05.3(3) -IA. Table 2.05.3(3)-lA <br />supersedes the current Table 2.05.3(3)-1 and will be used for the design work contained <br />in this application and any future designs. <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER CRAIG STATION <br />ESCALANTE STATION <br />NUCLA STATION <br />P.O. BOX 1307 <br />P.O. BOX 577 <br />P.O. BOX 698 <br />-` <br />A Touchstone Energy Cooperative 1 � CRAIG, CO 81626-1307 <br />PREWITT, NM 87045 <br />NUCLA, CO 81424-0698 <br />I ``�� 970-824-4411 <br />505-972-5200 <br />970-864-7316 <br />