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DISCHARGE SYSTEM 2019 ANNUAL OPERATIONS AND MAINTENANCE REPORT BERKELEY PIT AND DISCHARGE PILOT PROJECT
Atlantic Richfield Company, 17 pp, 2019

A full-scale pilot test is being conducted to evaluate treatment technologies and water management methods to meet Butte Mine Flooding Operable Unit Consent Decree requirements at the Berkeley Pit and control water elevation in the pit. The report summarizes the Discharge System annual operations and maintenance for 2019 as part of the pilot project. The system withdraws and treats Berkeley Pit water in the existing Horseshoe Bend Water Treatment Plant and discharged to the Yankee Doodle Tailings Impoundment (YDTI). YDTI water is then treated in a polishing facility that utilizes multi-media fractionation; reverse osmosis; a product tank; and polymeric coagulant, antiscalant, carbon dioxide, and organosulfide reagent systems chemical feed systems to remediate high pH (9.5-10.5) water. The water is then discharged into Silver Bow Creek. In 2019, the Discharge System successfully treated 447 million gals of water from the YDTI before offsite discharge. Additional components of the Discharge System will continue to be commissioned and demonstrated during 2020. https://pitwatch.org/wp-content/uploads/2020/04/Discharge_System_2019-Annual-OM-Rpt.pdf



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