2021-12-08_GENERAL DOCUMENTS - C1981019

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DocuSign Envelope ID:6BC32598-B737-464E-898A-81 F1 F7131339133 PERMIT NARRATIVE CONDITIONS REPORT FORM (continued) PART E. ADDITIONAL DESCRIPTION INFORMATION INCLUDED (a summary of information attached) In accordance with Part I.E.2. of the CDPS Permit #CO-0045161 for Colowyo Mine Outfall 010, this status/progress report is required to provide conclusions on bench-scale and pilot testing of treatment options, document selected treatment option, provide update in obtaining funding for selected treatment option, submit documentation that final designs of the treatment have been completed, and provide updates on any other activities undergone related to the installation of treatment to ensure the final limitations will be met by 10/1/2023. The bench-scale testing conducted in 2020 and early 2021 was reported to the Division in the May 2021 submittal, concluding that the passive biological sulfate reduction (BSR) methodology was not effective at reducing the overall chronic toxicity, and therefore, excluded from the treatment options. Based on this result, pilot testing was not pursued. The facility has chosen deep well injection as the selected treatment option. We worked with EPA Region 8 Underground Injection Control (UIC) permitting staff throughout the summer-fall 2021 , to support the submittal a Class V UIC permit application on November 11 , 2021 . A copy of the application was provided at the time of submittal to Ms. Erin Scott, Water Quality Control Division. A copy of the UIC permit application is also provided as an attachment to this report, which includes the design information for this treatment option. The funding process is underway, with the initial study scope addressed in 2020-2021 and capital expenses planned for 2022-2023. Colowyo and Tri-State's budgets are typically developed by Q2 for the following year, with final approval from the Board of Directors in Q3-4. The facility is currently working on contracting documents for the well construction anticipated to commence in mid-2022, which will support the final compliance date of 10/1/2023. The next compliance schedule Status/Progress Report is due 7/31/2022 to address commencement of construction for the selected treatment option. • PART E. CERTIFICATION Required Signatures "I certify under penalty of law that I have personally examined and am familiar with the information submitted in this application and all attachments and that, based on my inquiry of those individuals immediately responsible for obtaining the information, I believe that the information is true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine or imprisonment. "I understand that submittal of this application is for coverage under the State of Colorado Discharge Permit System until such time as the application is amended or the certification is transferred, inactivated, or expired." DocuSigned by: f2arbam (�atl� ''^ 12/8/2021 - A5D5C24494CD4A7... Signature of Legally Responsible Party Date Signed Barbara A. Walz Senior Vice President, Policy&Compliance/Chief Compliance Office Name (printed) Title Page 3 of 3 October 2021