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DocuSign Envelope ID: EBE28081-13782-41342-BAD13-D8C9313687131B <br />TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br />December 29, 2020 <br />Submitted electronically at capne.wgrecorascenter(a)state.co.us <br />Water Quality Control Division <br />Colorado Department of Public Health and Environment <br />Mail Code: WQCD-PU-B2 <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80246-1530 <br />RE: CDPS Permit #CO-0045161 <br />Status/Progress Report — Compliance Schedule on Chronic WET — Outfall 010 <br />ICIS Code CSO10 <br />Dear CDPHE Representative: <br />Enclosed is the CSO10 Status/Progress Report for the "Activities to Meet Final Chronic <br />WET (Ceriodaphnia dubia and Pimephales promelas) Limits (Outfall 010)" for the Colowyo <br />Coal Company L.P. — Colowyo Coal Mine (Colowyo) under CDPS Permit #CO-0045161. Tri- <br />State Generation and Transmission Association, Inc. (Tri-State) is the parent to Colowyo. <br />If you have any questions about the enclosed submittal for this permit, please contact <br />Chantell Johnson (303-254-3185, 303-482-6219 mobile, or ciohnsongtristate t�org) or Chris <br />Gilbreath (303-254-3291 or cgilbreathgtristategt.org). <br />Sincerely, <br />DocuSigned by: <br />1�a'l"�a2 va wa.j <br />A5DSC24494CD4A7_. <br />Barbara A. Walz <br />Senior Vice President <br />Policy and Compliance <br />Chief Compliance Officer <br />BAW:CJ <br />Enclosure <br />cc: Andrea Stucky, WQCD Permitting Unit (via email, andrea.stuck a,state.co.us) <br />Chris Gilbreath (via email) <br />Chantell Johnson (via email) <br />File G471-11.3(IO)a-2 <br />AN EQUAL OPPORTUNITY/AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy'Cooperative ?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 PREWITT, NM 87045 NUCLA, CO 81424-0698 <br />970-824-4411 505-876-2271 970-864-7316 <br />