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AN,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 31, 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 67 (TR -67) <br />Adequacy Review 1 <br />Dear Mr. Gilbreath: <br />We received your technical revision application for TR -67 regarding the reclamation of BB Road west of 2700 <br />Road. The revision was received on February 19, 2015 and was deemed complete on February 27, 2015. The <br />following issues have identified and need additional attention: <br />2.05.3(3) —Mine Facilities <br />1. On Table 2.05.3(3) -3, task 7 is "pave 27 Road and BB Road in original location and restore Sunshine <br />Ranch Corner intersection" and the date is listed as pending (waiting for a contractor to mobilize into <br />the area). Is the date still correct? <br />2.05.3(4) — Ponds, Impoundments, other treatment facilities and diversions <br />The proposed as -built Map 2.05.3(3) -4 -2) shows a storage capacity of 0.063 AC/FT at elevation 5647.0 <br />ft (bottom of pond) while the current sedcad in the permit of March 2006 shows 0.00 ac /ft at the same <br />elevation. Please clarify the proper storage capacity at the 5647.0 ft elevation for Pond 8. <br />2. Regarding the update of the as -built drawing of Pond 008, the Map 2.05.3(3) -4 -2 shows the drainage <br />area to be 102.9 acres but the sedcad was run using 110.436 AC (Attachmentments 2.05.3(3) -4 -2 and <br />2.05.3(3) -4 -4). Please clarify the proper acreage for the drainage basin for Pond 8. <br />In Attachmentments 2.05.3(3) -4 -2 and 2.05.3(3) -4 -4 of the approved permit, the units are inconsistent <br />across the two analysis. The inconsistencies are in total area (AC vs SQ FT), gross erosion, total yeild, <br />run -off volume, sediment volume and total volume. The Division cannot complete its review of the <br />culvert change for Pond 8 with the curently approved sedcad runs. Please make units consistent across <br />the input and output datasets in Attachmentments 2.05.3(3) -4 -2 and 2.05.3(3) -4 -4 and re- submit the <br />sedcad runs of the Pond Volume Calculations for both the 10 and 25 year 24 hour events. <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. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />pF CC}l0 <br />`' •, 4C <br />1876 x / <br />