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Welborn Sullivan Meck&Tooley&Leadville Sanitation 10 <br /> June 9,2023 <br /> Figure 3: TML Test Results (Patterson & Cook) <br /> VAS - 41 -4 <br /> =a. <br /> Y. <br /> .� rd <br /> ew <br /> Figure 13:Leadville Tailings 23_946m <br /> The test concludes that even after being exposed to extreme vibration, the <br /> material, should it slump, will only move slightly. This is an advantage to filtered <br /> tailings versus slurry tailings, and justifies the trend toward this method in the <br /> mining industry. <br /> Also, as discussed in Response 2, the topographic gradient is generally from <br /> northeast to southwest, away from the WWTF. <br /> o "The District is concerned that runoff or seepage from the FTD could affect <br /> the District's operations and water quality" <br /> This is addressed in Response 2. <br /> 10. UMC agrees with JVA's recommendation. Sampling does in fact require, and testing is <br /> indeed performed at ug/L limits, or as may be required otherwise. The Table 2-2 that is <br /> referenced in the objection letter reports metal content in solid waste, not water. EPA <br /> RCRA guidelines require metals to be reported in ppm (e.g.mg/L). <br /> Seismic Impacts <br /> The District is also concerned about the potential damage to its facilities from the Applicant's <br /> seismic activity. The District's wastewater treatment facility consists of a headworks for <br /> screening and grit removal, two aeration basins, two covered clarifiers, a polishing pond, <br /> and a chlorine contact chamber for disinfection. (11) The Applicant's operation of <br /> crushing equipment next door to the District's infrastructure threatens to crack <br /> foundations and pipelines that the District needs to operate its water treatment <br /> facilities. See JVA Memo. <br /> As explained in the JVA Memo, the District is under a compliance schedule to reduce inflow <br /> and infiltration into its collection system. (12) The increased seismic activity nearby could <br /> also affect the District's efforts to reduce inflow and infiltration. Damage to the <br /> collection system could result in seepage of wastewater into the ground. <br /> JVA Reference: <br /> (13) Nearby seismic activity from the proposed Mill could also have detrimental <br /> effects to the existing WWTF structures that are required for wastewater treatment <br /> and permit compliance. <br /> 11. The following is excerpted from the September 9, 2012 New Hampshire Department of <br /> Transportation Research Record titled, "Ground Vibrations for Construction Equipment'. <br /> "The 2006 Federal Transit Administration (FTA) manual, "Transit Noise and Vibration Impact <br /> Assessment", recommends a procedure for estimating vibration impact from construction <br />