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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 />20 May 2015 <br />Chris Gilbreath <br />Tri-State Generation and Transmission Association, Inc <br />PO Box 33695 <br />Denver, CO 80233-0695 <br />Dear Mr. Gilbreath: <br />The Division has received the Tri-State Generation and Transmission Association, Inc's (Tri-State) <br />submittal for Technical Revision 105. The submittal was received on 8 April 2015 and deemed <br />complete on 20 April 2015. The proposed decision date is 19 June 2015. Tri -State's prompt response <br />to this letter will help ensure a decision is proposed in a timely manner. The Division has completed <br />its preliminary adequacy review and has the following comments and questions. <br />General Comments <br />The Table of Contents states that Exhibit 7, Item 13 has been superseded. Is this deletion <br />correct and, if so, please detail what has superseded this item. <br />Rule 2.10 — Maps and Plans <br />2. Maps 29 and 29A provide details on backfilling and rough grading operations for the West <br />Pit and South Taylor Pit, respectively. The majority of the reclamation blocks have planned <br />reclamation dates shown. The exceptions are the reclamation blocks that contain topsoil <br />piles. Please add reclamation dates to the reclamation blocks on Maps 29 and 29A that <br />contain topsoil stockpiles. <br />3. On Map 20B — Premining and Postmining Cross -Sections -South Taylor, the blue South <br />Taylor Fill Design line appears to run outside of the current limits of the fill. Please review <br />blue South Taylor Fill Design lines shown on these cross-sections and revise as <br />necessary. <br />4. On Map 20B — Premining and Postmining Cross -Sections -South Taylor, the black "PMT" <br />line should not extend under the permanent portions of the South Taylor Fills, as these are a <br />permanent feature and are at the post -mining topography. Please review the black "PMT" <br />lines shown on these cross-sections and revise as necessary. <br />5. On Map 20B — Premining and Postmining Cross -Sections -South Taylor, section line B -B' <br />from approximately stations 10+10 to 20+50 appears to be incorrect. It appears to show this <br />OF COLO <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I * I *i <br />John W. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director * *1876 * <br />