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Letter from Denver Water Re: Permit No. M-1977-300 <br />December 4, 2017 <br />Page 3 of 3 <br />• the structure of CLL, including documentation demonstrating Alexco's and LLS's <br />ownership and any operating agreements with CLL; <br />• CLL's current operating agreement; <br />• an operational and financial analysis of what it will take to comply with the Mine <br />Land Reclamation Board's amended August 2010 Order to keep the mine pool at <br />a level of 150 feet below Steve Level; <br />• an operational plan to comply with the amended August 2010 Order for the <br />foreseeable future. <br />Schwartzwalder Mine has a complex hydrology. As an underground mine, Schwartzwalder <br />presents significant groundwater reclamation and remediation issues. The future treatment, <br />reclamation and remediation of the mine pool will take a great deal of resources and expertise, <br />which will likely extend over many years if not decades. This is demonstrated by the fact that <br />Cotter has just recently complied with the amended August 2010 Order to dewater the mine pool <br />at Schwartzwalder to 150 feet below the Steve Level. <br />If you have any questions regarding the contents of this letter, please do not hesitate to contact <br />me. <br />Sincerely, ,• <br />Tom Roode <br />Chief Ops. & Maintenance Officer <br />Denver Water <br />Enclosures: (1) Attachment A -- 2 graphs of sampling data trends <br />