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TRI-STATE GENERATION AND TRAI: rUAISSIO 1 ASSOCIATION, INC. <br />HEADQUARTERS- P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br />July 11, 2016 - <br />Mr. Eric Mink <br />Water Quality Control Division <br />Colorado Department of Public Health and Environment <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80246-1530 <br />RE: Notification of Chronic WET Violation for Outfall 013 and <br />Accelerated WET Testing Notification <br />New Horizon Mine, CDPS Permit #CO -0000213 <br />Dear Mr. Mink: <br />On July 5, 2016, the third party laboratory, The Seacrest Group, provided the enclosed <br />analytical report to Tri-State Generation and Transmission Association (Tri-State) containing the <br />Whole Effluent Toxicity (WET) testing results for Outfall 013 at the Elk Ridge Mining and <br />Reclamation, LLC (Elk Ridge) New Horizon Mine (CDPS Permit #CO -0000213). Tri-State is <br />the parent of Elk Ridge. Therefore, we are providing the required notification of WET violation, <br />in accordance with Part I.D.Ib of the permit. <br />Outfall <br />Species <br />Reproduction Results <br />IWC <br />NOEC* <br />IC25** <br />013 <br />Ceriodaphnia dubia <br />80% <br />81.3% <br />100% <br />*NOEC means "no observed effect concentration" at which concentration there are no <br />observable adverse effects on the organisms. <br />**IC25 means inhibition concentration causing a 25% reduction in the biological measurement. <br />The facility has commenced accelerated WET testing for the sensitive species for this <br />outfall location to determine if there is a pattern of toxicity as of July 5, 2016. We will report <br />these results to the Division, when available. We will also be submitting the initial WET test <br />sup mr r t and chains of custody with the June 2016 Discharge Monitoring Report (DMR) by July <br />28, 2016. <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy°Cooperative It <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 NULLA, CO 81424-0698 <br />970-824-4411 505-972-5200 970.8647316 <br />