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AW W COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />November 18, 2015 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association, Inc. <br />P.O. Box 33695 <br />Denver, CO 80233-0695 <br />Re: New Horizon 2 (Permit No. C-1981-008) <br />Technical Revision 69 (TR -69) <br />Adequacy Review 1 <br />Dear Mr. Gilbreath: <br />The Division received your technical revision application for TR -69 regarding the new sediment pond 18 on <br />October 9, 2015. The application was deemed complete on October 19, 2015. <br />The Division finished its review of TR -69 and has the following comments or questions: <br />2.05.3(3) <br />1. On page 4, bullet f contains a list of ditches and culverts that are permitted as permanent. This <br />list is not complete and needs to be updated. Examples of missing ditches are C 1, C4, C23, C24 <br />and missing culverts 119 — 124. Please update this list. <br />2. Table 2.05.3(3)-lA Curve Numbers From October 1, 2015 to Present has been added to the text. <br />The curve numbers are different from the currently approved Table 2.05.3(3)-1. Please explain <br />the purpose of Table 2.05.3(3)-1A, how it will be utilized and if the new table will supersede the <br />current Table 2.05.3(3)-l. <br />3. There is discussion in Section 2.05.3(3) about the designs of ponds 007 through 015 but there is <br />no mention of Pond 18. Please add a discussion about Pond 18 or reference Attachment <br />2.05.3(3)-28 in the text. <br />4. On page 2.053(3)-14, bullet g has been added. It states that all ponds will have a keyway cut <br />along the entire width of the dam as shown on Map 2.05.3(3)-6-1. The current version of Map <br />2.05.3(3)-6-1 does not describe or point out the keyway. Please amend the map to describe the <br />keyway. <br />—C <br />nO <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director * fg76 <br />