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Welborn Sullivan Meck&Tooley&Leadville Sanitation 7 <br /> June 9,2023 <br /> o Material will be dumped in a receiving bunker that will be below grade at the <br /> dumping point and contained on 3 sides as well as roof area. <br /> o The dumping point will also include dust mitigating measures. <br /> o A loader will pick up and dump the material from the bunker into a grizzly bin. <br /> Dust in this area will also be controlled by water sprays. <br /> o The crusher will be in an enclosed, and sound-insulated building. <br /> UMC will provide Leadville Sanitation with the updated permit document <br /> containing this and other items addressed during the CDRMS review process. <br /> 6. The site already has 3 legacy stockpiles, one legacy tailings pile, and 2 topsoil piles. <br /> o Stockpiles. The 3 legacy stockpiles were placed by the original owners in the <br /> early 1990s. In all, these total about 2,000 tons, so will be removed in a matter of <br /> a few days. These piles originated from the Hopemore Mine and the IBEX No. 4 <br /> low-grade vein dumps. These piles are covered to prevent dust and more <br /> importantly to keep off water and reduce ARD. The current Mill permit (and it is <br /> assumed the current Permit Application) requires these piles be removed within <br /> 60 days of plant start-up. There will be no stockpiles- except the concrete ore <br /> bunker- during normal operation <br /> o Legacy Tailings Pile. This pile is also covered and is about 1,100 tons. It will <br /> also be removed within the first 60-days of operation. The method will be the <br /> same as for the stockpiles. However, the tailings are very wet and not prone to <br /> generate dust. <br /> o Topsoil. There are 2 topsoil piles. One on the East side of the property near the <br /> Sanitation polishing pond, and one near the ECS. These consist of topsoil <br /> common in the area and planted with cover and will be used for final reclamation. <br /> Only the topsoil will remain. The operation will not have more than 1,200 tons of feed <br /> material on site at any time which will be kept in a contained concrete bunker with dust <br /> control mitigations. <br /> 7. As stated in No. 5, UMC will provide a complete dust control plan to Leadville Sanitation <br /> once it is completed. <br /> In the meantime, can JVA provide discussion on how metals transported by air could <br /> have short- or long-term effect to water at the WWTF? For example, it is reported that <br /> Sanitation releases approximately 1.1 million gallons of treated water daily. Given the <br /> size of the polishing pond and other facilities, it appears that this water is replaced in <br /> only a matter of a few days. Understanding how airborne metal accumulation in the <br /> water can occur will be helpful in improving our dust control design. <br /> Filtered Tailings Deposit <br /> The Application has been revised to include a Filtered Tailings Deposit instead of a Tailings <br /> Storage Facility (TSF). (8) It will still, however, involve a significant amount of cyanide. (9) <br /> Moreover, it will be located uphill and even closer to the District's polishing pond. The <br /> District is concerned that runoff or seepage from the FTD could affect the District's <br /> operations and water quality. See JVA Memo. <br /> JVA Reference: <br /> (10) Also, it's important to note that the tailings detection limits per Table 2-2 Mill Tailings <br /> TCLP Results below are in mg/L for the metals listed while the District's permit limits are <br /> in ug/L. If the Mill is only required to test the tailings to mg/L, they could be reporting non <br /> detectable values because of the test methods utilized are not capable of measuring to <br />