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M-1977-410 <br />Technical Revision 10 <br />April 26, 2022 <br />1 <br /> <br />Contents <br />Section 1: Introduction and Site Description ............................................................................... 2 <br />Section 2: Water System Timeline and Historical Background .................................................... 3 <br />Section 3: Discharge Limitations & Filtration Studies from 2020-2021 .................................... 7 <br />May 2021 – Filtration study ..................................................................................................... 10 <br />Section 4: Summary of Previous Treatment Methods ............................................................... 11 <br />Section 5: Selection Criteria for Pilot Treatment System ........................................................... 12 <br />Graver Technologies (MetSorb©) bench-scale testing: ........................................................... 12 <br />Section 6: Pilot/Current Treatment System ............................................................................... 13 <br />Pilot system and water flow path: ........................................................................................... 13 <br />Pilot system automation features: .......................................................................................... 14 <br />Section 7: Additional Clarification Regarding DRMS comments ................................................ 17 <br />Brief description of Surface Water and Groundwater Monitoring Plans: ................................ 19 <br />Piping Change Redirecting Effluent from Caribou/Idaho Tunnel into the Juliet Raise (Cross <br />mine): ...................................................................................................................................... 21 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />