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COLORADO LEGACY LAND <br /> SCHWARTZWALDER MINE <br /> This reclamation strategy is consistent with the current disposal strategy and regulatory principles for <br /> maximizing the long-term protection of human health and the environment. Disposal inside underground mine <br /> workings provides complete/permanent isolation from active surface environment,no impact or de minimis <br /> impact to onsite water quality,no long-term maintenance,and no additional engineering design. This strategy <br /> is also preferable to disturbing the onsite Waste Rock Piles or trucking source-term material through a <br /> residential community and along State Highway 93 for offsite disposal.If the Minnesota and Black Forest reach <br /> capacity before the excavation is complete, CLL will meet with DRMS and other regulatory agencies as <br /> appropriate to attain consensus on the most appropriate option(capped waste rock pile,or offsite repository) <br /> or combination of options,for disposal of alluvial fill source term materials from the Schwartzwalder Mine site. <br /> E.5. MINE POOL MITIGATION <br /> The mine pool mitigation plan listed in this section of the 2012 Mine Permit Amendment 4was revised per <br /> Technical Revision#27. A summary of the revisions are provided below for reference. <br /> In 2019, a new submersible pump (60HP Goulds Model 7CSL) was lowered down the Jeffery Air shaft to <br /> approximately 400-feet below the Steve Adit on a custom fabricated housing sled via a wench system. The <br /> housing sled was designed to protect and support the pump during installation and operation. The dedicated <br /> winch system was installed adjacent to the vent shaft on a concrete footer. The new winch system allows <br /> above-ground access to the pump for maintenance and repair,which supports the long-term health and safety <br /> goal of eliminating all underground work onsite. The only change to the mine pool mitigation strategy was the <br /> upgrade and relocation of the submersible pump, no other treatment process changes were implemented. <br /> Figure E-2 shows the process flow diagram for the onsite water treatment plant. <br /> EA WATER QUALITY MONITORING PLAN <br /> The water quality monitoring plan listed in this section of the 2012 Mine Permit Amendment 4 was reviser per <br /> Technical Revision#27. A summary of the current water quality monitoring plan is provided below. <br /> The sampling rationale for the Schwartzwalder Mine is dictated by two permits: Colorado Mining Permit#M- <br /> 1977-300 and Colorado Discharge Permit#CO-0001244. Quarterly water quality monitoring is conducted in <br /> accordance with Colorado Mining Permit#M-1977-300 and two monthly water quality monitoring programs <br /> conducted in accordance with Colorado Discharge Permit#CO-0001244. All three water quality monitoring <br /> programs are descried below. <br /> E.6.1 Colorado Mining Permit#M-1977-300 <br /> The mine permit(M-1977-300) was issued by the State of Colorado in 1977 and is currently overseen by the <br /> Colorado Division of Reclamation and Mining Safety(CDRMS). Since the 2012 Mine Permit Amendment 4 there <br /> have been two Technical Revisions to Permit #M-1977-300, which define the quarterly water quality <br /> monitoring program: <br /> • Technical Revision 27 solidified the environmental monitoring requirements for surface water, <br /> groundwater,and the mine pool. Samples are collected and reported to CDRMS on a quarterly basis. <br /> JANUARY 2021 17 AMENDMENT 5 <br />