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TRI -STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />Ar » HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233 -0695 303 - 452 -6111 <br />December 20, 2013 <br />Mr. Mike Boulay V���� <br />Division of Reclamation, Mining, & Safety <br />Coal Program Support Staff � C 2 41W <br />1313 Sherman Street, RM 215 0E REr' pT ON <br />Denver, Colorado 80203 pMS�pN p SAFEV <br />M�N�NG Ai', <br />RE: Annual Hydrology Report <br />Western Fuels — Colorado, New Horizon Mine <br />DRMS Mine Permit #C- 1981 -008 <br />Dear Mr. Boulay and DRMS Representative: <br />Enclosed is a copy of the Annual Hydrology Report for the 2013 Water Year (October <br />2012 — September 2013) for the Western Fuels — Colorado, A Limited Liability Company <br />(Western Fuels — Colorado) New Horizon Mine. Tri-State Generation and Transmission <br />Association, Inc. (Tri- State) is the parent to Western Fuels — Colorado. During the 2013 Water <br />Year, the mine did not discharge through Outfalls 008, 009, 011, and 012. Outfa11010 has not <br />been constructed to date; therefore no data is included in this report. <br />All NPDES outfalls, surface water, and groundwater wells have monitoring requirements <br />identified by the Division of Reclamation, Mining and Safety. The Colorado Discharge Permit <br />System (CDPS) also has specific monitoring requirements and effluent limits for the NPDES <br />outfalls. The required monitoring is outlined in the Approved Hydrological Monitoring Program <br />enclosed. <br />During the 2013 Water Year, the facility conducted Whole Effluent Toxicity (WET) <br />testing on the NPDES outfalls. The WET testing data is enclosed with this report. The <br />Discharge Monitoring Reports (DMR) were previously submitted to the Division on a monthly <br />basis. During June 2013, the mine experienced an Upset Condition on Outfall 007 that was <br />reported to the Water Quality Control Division and resolved with a CO2 bubbler system. The <br />Upset Condition report and resolution are enclosed with this report. <br />AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy'Cooperative -t <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 PREWITT, NM 87045 NUCLA, CO 81424 -0698 <br />970- 824 -4411 505 - 972 -5200 970 - 864 -7316 <br />