Aquatic Effects Monitoring Program (AEMP) 2020 Annual Report, Cujo Lake Dissolved Oxygen Monitoring Memo, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2021)
This memorandum reports on 2020 mitigation and monitoring efforts for low under-ice dissolved oxygen (DO) concentrations in Cujo Lake at the Ekati Diamond Mine. An aerator installed in January 2020 failed in February and could not be repaired; monitoring showed DO concentrations fell below the CCME guideline of 6.5 mg/L by late March, with comparative monitoring at White and Alexia lakes suggesting that low under-ice DO may be driven by natural lake morphology rather than mining activities.
- Date
- Document type
- Memo
- Parties
- Arctic Canadian Diamond Company Ltd., Wek'èezhìi Land and Water Board, Joseph Mackenzie, Laura Pacholski, ERM Consultants Canada Ltd., Dominion Diamond Mines ULC
- Locations
- Cujo Lake, White Lake, Alexia Lake, Ekati Diamond Mine, East-Main Basin, North Basin, Northwest Territories, Calgary, AB, Yellowknife, NT
- Parameters
- dissolved oxygen, under-ice dissolved oxygen, water temperature, lake morphology, aeration, snow clearing, ice-cover phenology, photosynthetic oxygen production, aquatic response framework, CCME guideline
- Pages
- 18
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