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Welborn Sullivan Meck&Tooley&Leadville Sanitation 5 <br /> June 9,2023 <br /> addition, the FTD design includes a 250-ft offset (yellow circle in figure) assuring that it is <br /> not up-gradient from the WWTF. <br /> All surface flows (e.g. rain and snow) from the FTD will be captured in a lined catchment <br /> pond. In the unlikely event of a catastrophic failure, all surface flows will be captured in <br /> the Emergency Containment Sump (ECS) as seen at the bottom left of Figure 1, which <br /> follows the natural drainage. <br /> Figure 1: Sewer Line Location Relative to FTD & Crusher <br /> Sewer Line <br /> Crusher <br /> Ni <br /> tARw <br /> Cyanide <br /> Although processing gold ore with cyanide may be standard in the industry, it is not without risk. <br /> The Material Safety Data Sheet ("MSDS") for sodium cyanide shows it to be identified with the <br /> following hazards: corrosive to metals, acute oral toxicity, acute dermal toxicity, acute inhalation <br /> toxicity, and specific target organ toxicity (single exposure). It is fatal if swallowed, in contact <br /> with skin, or inhaled. It is also "(v]ery toxic to aquatic life with long lasting effects.59 Application, <br /> Appendix 21-2. There have been a number of serious incidents around the world involving <br /> cyanide spills and leaks. The amount of sodium cyanide the Applicant proposes to use, 1,600 <br /> pounds per day, is not insignificant. Application, Exhibit D, Table 4-6. (3) The mere fact of the <br /> next door neighbor using so much cyanide gives the District concern. <br /> In addition, the District is concerned that the Applicant has not demonstrated that it has <br /> significant experience working and processing ore with cyanide. Showing a high level of <br /> expertise should be required before approving the permit conversion. <br /> Response: <br /> 3. Cyanide is highly regulated by CDRMS, and is addressed in the permit. UMC is working <br /> with CDRMS to address questions they have with respect to cyanide (as well as other <br /> reagent management protocols. UMC will provide Leadville Sanitation with the <br /> updated permit document containing this and other items addressed during the <br />