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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 />October 8, 2014 <br />Mr. Robert Zuber, P.E. <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 RECEIVED <br />RE: New Horizon North Mine <br />Permit No. C- 2010 -089 OCT 1 d 214 <br />TR -06 Adequacy Review Responses <br />Division of Reclamation, <br />Dear Mr. Zuber: Mining & Safety <br />Tri -State Generation and Transmission Association, Inc.(Tri- State) has received your <br />adequacy letter for TR -06, dated September 26, 2014 and provides the following responses to <br />your comments on behalf of the Western Fuels - Colorado, A Limited Liability Company <br />(Western Fuels - Colorado) New Horizon North Mine. <br />1. The ditch designs need to be specific. Please break each ditch into segments (as <br />appropriate based on slope or other factors) and give us specific design parameters, <br />namely bottom width and lining material. <br />Response: Table 2.05.3(4) -8 -2 has been revised to reflect the NHN -002 North and <br />NHN -002 South ditch into segments based on the slope along the given ditch alignment. <br />Stationing has been provided on Map 2.05.3(4) -9 which corresponds to the information <br />provided on Table 2.05.3(4) -8 -2. For each segment as shown on Table 2.05.3(4) -8 -2, <br />flows, slopes, minimum bottom widths, side slopes, and appropriate ditch lining has been <br />provided. <br />2. It is unclear where the flows for the ditch designs originate. Please describe this in the <br />submittal. <br />Response: In Appendix 2.05.3(4) -8, page 3, last sentence under the heading <br />"Stormwater Data", a citation has been provided to clarify that Model 1 and Model 2 are <br />the SEDCAD runs contained within Appendix 2.05.3(4) -8. Additionally, the intent of <br />TR -06 is to replace all design information for Pond NHN -002 and NHN -002 South and <br />North Ditches contained within Appendix 2.05.3(4) -l. Appendix 2.05.3(4) -1 cannot be <br />removed from the PAP as it still contains relevant design information for future ponds <br />and ditches. To clarify that the design information provided under TR -06 supersedes all <br />information contained in Appendix 2.05.3(4) -1, a note has been added to the cover page <br />of Appendix 2.05.3(4) -1. <br />AN L:UU it. OPPORTUNiTS I Ab -iH &itiT IVC ACTION k:hli -' _OYL -t <br />A Touchstone EneragrCooperative 0 <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />P.O. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO 81626 -1307 PREWrrT, NNI 87045 NUCLA, CO 81424 -0698 <br />970 - 824 -4411 505- 972 -5200 970- 864 -7316 <br />