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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 />March 1, 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 70 (TR -70) <br />Adequacy Review 1 <br />Dear Mr. Gilbreath: <br />The Division received your technical revision application for TR -70 regarding the modifications to the post <br />mining topography, hydrology, and prime farmland on WFC and a modification to the #8 seed mix on January <br />22, 2016. The application was deemed complete on February 1, 2016. <br />The Division finished its review of TR -70 and has the following comments or questions: <br />Section 2.04.9 — Soil Resource Information <br />1. On page -24 in bullet 17, it states that Map 2.05.4-4, -6 and -9 show the topsoil placement. Map 2.05.4- <br />9 is the topsoil stockpile map and doesn't show topsoil placement. Map 2.05.4-7 shows topsoil placement <br />for the northwest properties. This appears to be a typo. Please clarify. <br />Section 2.05.3(3) — Mine Facilities <br />1. On page 2.05.3(3)-3, it appears that bullet e. was omitted from the revised page. Please correct this typo <br />for consistency with page -4. <br />2. Map 2.05.3(3)-1 Surface Water Hydrology does not show the straw waddles and the small area exemption <br />on the Morgan property. Please include these features on the map as they are current features of surface <br />water hydrology. <br />3. Approved Map 2.05.3(3)-1 delineates Ditches C-10 draining a basin of 5.2 acres to Pond 013 and D1W <br />draining a basin of 25.1 acres to what appears to be Pond 015. Both C-10 and D 1 W are not identified <br />on the proposed revised Map 2.05.3(3)-1 submitted with the TR -70 application. Based on the contour <br />of the land it may be the case that ditches C-10 and D 1 W may not be required; however, a discussion as <br />to the prevention of disturbed area run-off from the west side of the permit to Pond 013 was not <br />included. Please provided a revised Map 2.05.3(3)-1 to include these ditches or provide a revised <br />Attachment 2.05.3(3)-1 providing a justification and noting that these ditches are no longer required. <br />QF CQ�Q <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 * * 1g76 <br />