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nCOLORADO <br /> ..w Division of Reclamation, <br /> „ Mining and Safety <br /> Department of Natural Resources <br /> MEMORANDUM <br /> Date: June 23, 2022 <br /> To: Zach Trujillo, DRMS <br /> From: Rob Zuber, DRMS <br /> RE: Colowyo Mine (permit C-1981-019), <br /> Review of TR-154 Application, Emphasis on Sediment Control <br /> I reviewed the sediment control portions of the TR-154 application, including text, figures, and <br /> SEDCAD output pages. I have the following adequacy items: <br /> I. The figures with watersheds during mining (Figure 7-23B-1 and Figure 7-23C-1) do not <br /> indicate channels and ponds, which are very important for understanding the respective <br /> SEDCAD models. Please add the channels and ponds to the figures. <br /> 2. No SEDCAD output pages were provided for Exhibit 7, Item 23, Part I (Section 25 Pond, <br /> post-mining condition). Please provide these pages. <br /> 3. On page Exhibit 7-23J-2, the text states that the 25-year event in the Section 26 Pond peaks <br /> at an elevation of 6,985.5 feet. However, in the associated SEDCAD model the peak <br /> elevation is 6,984.44 feet for this structure. Please explain this apparent discrepancy, and <br /> adjust the text or model, as necessary. <br /> e�O� Cp1Q <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 https://colorado.gov/drms y �� <br /> Jared Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br /> I * * <br /> 'f 1876{` <br />