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0 Boulder 0 Fort Collins 0 Winter Park ®Glenwood Springs 0 Denver <br /> 1319 Spruce Street 213 Linden Street PO Box 1860 817 Colorado Avenue 1512 Larimer Street <br /> Boulder,CO 80302 Suite 200 47 Cooper Creek Way Suite 301 Suite 710 <br /> _/ \I \"' 303.444.1951 Fort Collins,CO 80524 Suite 328 Glenwood Springs,CO Denver,CO 80202 <br /> _— _' _ 970.225.9099 Winter Park,CO 80482 81601 303.444.1951 <br /> T -E R S <br /> 970.722 7677 970.404.3100 <br /> www.jvajva.com <br /> MEMO <br /> TO: District Board DATE: March 18,2024 <br /> FIRM: Leadville Sanitation District JOB NO. 1119.2e <br /> ADDRESS: 911 US Hwy 24 PROJECT: Union Milling—Permit M1990-057 <br /> Leadville,CO 80461 SUBJECT: District Engineer Objections <br /> Dear District Board, <br /> JVA has reviewed the Union Milling Company Mill(Mill)revised Permit M-1990-057 Version 1 Leadville Mill Permit <br /> dated February 2,2024,received March 6,2024,and developed a list of objections based on potential impacts and <br /> detrimental effects to the Leadville Sanitation District's(District)Wastewater Treatment Facility(WWTF)and sanitary <br /> sewer collection system.The Mill is located directly west of the District's WWTF and was constructed in 1989 and <br /> operated through 2000 as a stand-alone facility.The District's sanitary sewer collection system runs through the <br /> northern part of the property. <br /> In review of the new Mill permit application,JVA understands the Mill has proposed to change the original <br /> constructed tailing facility to a double-lined sump to prevent any catastrophic spill into ground or surface water.The <br /> filter tailings deposit(FTD)will filter tailings prior to deposition.Seepage from the tailings as well as snow and runoff <br /> will be captured in a lined down-gradient catchment pond. <br /> JVA has similar concerns to the previously submitted mill permit application primarily related to seismic activity and <br /> low level metals. <br /> The report states the Area 100 Crushing Circuit will maintain low seismicity.Although the applicant indicates low <br /> seismicity,JVA is still concerned about potential disturbance and impacts to the District's collection system.The <br /> District collects and treats wastewater from downtown Leadville as well as developments located west of Leadville. <br /> Wastewater flows by gravity through the collection system to the WWTF. Figure 1 below shows the District's existing <br /> sanitary sewer line that contains significant wastewater flows that could be directly impacted by the new crushing <br /> facility. <br />