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DocuSign Envelope ID:6BC32598-B737-464E-898A-81 F1 F7BB39B3 <br /> TRI-STATE <br /> December 8, 2021 <br /> Submitted electronically to cdphe.wgrecordscenterfa)state.co.us <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: Code CSO10— Status/Progress Report on Chronic WET Limits for Outfall 010 <br /> Colowyo Mine, CDPS Permit#CO-0045161 <br /> Dear WQCD Representative: <br /> As required by the Colorado Discharge Permit System (CDPS)Permit#CO-0045161 in Part <br /> I.E.1. Compliance Schedules, enclosed is the CSO10 Status/Progress Report for the"Activities to Meet <br /> Final Chronic WET (Ceriodaphnia dubia and Pimephales promelas)Limits (outfalls 010)" for the <br /> Colowyo Coal Company L.P. — Colowyo Coal Mine (Colowyo). Tri-State Generation and Transmission <br /> Association, Inc. (Tri-State)is the parent to Colowyo. <br /> If you have any questions on this compliance schedule report, please contact Chantell Johnson at <br /> 303-254-3185 office or 303-482-6219 mobile (ciohnsongtristategt.org) or Chris Gilbreath at 303-254- <br /> 3291 (cgilbreathntristategt.org). <br /> Sincerely, <br /> DocuSigned by: <br /> 1�av'l�a�'a <br /> ASD5 t"4'94CD4A7... <br /> Barbara A. Walz <br /> Senior Vice President <br /> Policy and Compliance <br /> Chief Compliance Officer <br /> BAW:CJ:der <br /> Enclosures <br /> cc: Chris Gilbreath(via email) <br /> Chantell Johnson (via email) <br /> File G471-11.3(10)a-2 <br /> P.O.BOX 33695 <br /> DENVER,CO 80233-0695 A Touchstone Energy <br /> 303-452-6111 Cooperative <br /> R <br /> WWW.TRISTATE.COOP <br />