Effluent Quality Criteria

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Aquatic Effects Monitoring Program (AEMP) Annual Report 2023, Appendix A and B, Summary, Ekati Diamond Mine (Independent Environmental Monitoring Agency, March 2024)
1 March 2024Report
The 2023 Aquatic Effects Monitoring Program (AEMP) annual report for the Ekati Diamond Mine documents surveillance network sampling results and aquatic effects evaluation across four watersheds (Koala, King-Cujo, Pigeon-Fay/Upper Exeter, and Horseshoe) and associated downstream lakes. The report presents water quality, sediment quality, and aquatic biology data collected throughout 2023, identifies mine-related effects through comparison to action levels and benchmarks, and describes adaptive management responses through the Aquatic Response Framework.
Water Quality SNP Aquatic Effects Monitoring (AEMP)
Comments on 2022 3-Year Seepage Report, Ekati Diamond Mine (Independent Environmental Monitoring Agency, December 2023)
11 December 2023Letter
The Independent Environmental Monitoring Agency provides detailed comments on Arctic Canadian Diamond Company Ltd.'s 3-year Seepage Report, addressing concerns about receiving environment definitions, adaptive management response triggers, geochemical characterization, seeps of potential concern identification, reference seep monitoring, and data interpretation issues related to the Ekati Diamond Mine operations.
Waste Rock Water Quality Effluent Quality Criteria
Surveillance Network Program (SNP) Monthly Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, August 2023)
1 August 2023Report
Burgundy Diamond Mines' August 2023 Surveillance Network Program monthly report for water licence W2020L2-0004, documenting water quality sampling results, flow measurements, and operational data. The report identifies exceedances of total suspended solids and total copper at station 1616-43 on August 22, 2023, with notification sent to GNWT Lands Inspector.
SNP Water Quality Water Licence
Environmental Agreement and Water Licence Annual Report 2022, Regulatory Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, July 2023)
17 July 2023Regulatory Filing
This document comprises regulatory comments on the 2022 Ekati Diamond Mine Environmental Agreement and Water Licence Annual Report from multiple government agencies, Indigenous governments, and the Independent Environmental Monitoring Agency. The reviews identify deficiencies including unreported Point Lake dewatering exceedances and effluent quality criteria violations, along with recommendations for improved reporting on air quality monitoring, wildlife surveys, dust suppression, and water management.
Regulatory Water Quality Effluent Quality Criteria Monitoring
Surveillance Network Program (SNP) Monthly Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, June 2023)
1 June 2023Report
Burgundy Diamond Mines' Surveillance Network Program (SNP) monthly report for June 2023 under Water Licence W2020L2-0004, submitted to the Wek'èezhii Land and Water Board. The report documents water quality monitoring, flow measurements, discharge volumes, and analytical results from 22 samples collected at various monitoring stations around the Ekati Diamond Mine, including an incident of elevated turbidity in King Pond that resulted in temporary suspension of discharge to Cujo Lake.
SNP Water Quality Water Licence
Surveillance Network Program (SNP) Summary and Waste Rock Seepage Survey Report, Appendices A-B, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2021)
31 December 2021Report
This 2021 Surveillance Network Program (SNP) summary and Waste Rock Seepage Survey report documents water quality monitoring and effluent compliance at the Ekati Diamond Mine under Water Licence W2020L2-0004, including monthly sampling results from multiple surveillance stations, seepage quality assessments across waste rock storage areas, and identification of twelve seeps of potential concern requiring adaptive management.
SNP Water Quality Effluent Quality Criteria Regulatory
Waste Rock Storage Area (WRSA) Seepage Framework Discussion, Ekati Diamond Mine (Dominion Diamond, November 2019)
~2019Presentation
Approximate date — inferred from filename
Dominion Diamond Mines presents a framework for managing Waste Rock Storage Area (WRSA) seepage in response to a WLWB directive, proposing ecologically-derived thresholds and adaptive management action levels to replace Environmental Quality Criteria as the regulatory control for seepage monitoring and response.
Waste Rock Water Quality Regulatory Development Plans
Aquatic Effects Monitoring Program (AEMP) Selenium Response Plan, Version 1.1, Ekati Diamond Mine (Dominion Diamond, June 2017)
16 June 2017Report
This Aquatic Response Plan for Selenium Version 1.1 documents Dominion Diamond Ekati Corporation's response to elevated selenium concentrations detected in Cujo Lake during winter 2016, which triggered a low action level under the Aquatic Response Framework. The plan proposes revised action levels based on the US EPA's 2016 lentic water quality criterion (0.0015 mg/L) and describes ongoing selenium control measures, with findings indicating the elevation was temporary and unlikely to cause adverse ecological or human health effects.
Aquatics Water Quality Aquatic Effects Monitoring (AEMP)
Revised Site-Specific Water Quality Objectives for Potassium, Ekati Diamond Mine (Dominion Diamond, July 2015)
2015Report
Ekati Diamond Mine Revised Site-Specific Water Quality Objectives (SSWQO) for Potassium, Version 1.0, prepared by Dominion Diamond Ekati Corporation, July 31 2015, transmitted to Violet Camsell-Blondin, Chair, Wek'èezhii Land and Water Board, Yellowknife. Includes 21-day Chronic Freshwater Toxicity Test data using Daphnia magna (Sample ID Potassium WER-SITE, Work Order 1522, March 18 – April 2015) with daily reproduction counts and initial/final water quality measurements (pH, conductivity µS, potassium concentrations), and Appendix E.5 Selected Normal Species Sensitivity Distribution (SSD) Model Residual Normality Test results (Shapiro-Francia W', D'Agostino & Pearson's K²).
Water Quality Effluent Quality Criteria Aquatics Correspondence
Water Licence Renewal Application, Ekati Diamond Mine, W2009L2-0001 (Ontario Ministry of the Environment, April 2012)
2012Regulatory Filing
BHP Billiton Diamonds Ekati Water Licence Renewal Application 2012 (Eric Denholm BHP Billiton Diamonds, Reference 11-1421-0018, April 23 2012). Includes Ontario Ministry of Environment Standards Development Branch's contributed Canadian Water Quality Guidelines (CWQGs) for chloride and the recently revised CWQG for nitrate to the CCME Water Quality Task Group, Buckley/Roch/McCarter/Rendell/Matheson (1982) chronic-coho-salmon copper-exposure studies, Kamunde/Grosell/Higgs/Wood (2002) copper metabolism in rainbow trout, Rescan 2012 EKATI Koala Watershed Water Quality Modelling, Ohio Administrative Code 3745-1 Division of Surface Water, Rai/Eary/Zachara (1989) chromium environmental chemistry, and Roe et al. (2010) Canadian water quality guidelines for chloride.
Water Quality Water Licence Regulatory
Proposed Chloride Discharge Criterion for the Sable Kimberlite Pipe Development, Ekati Diamond Mine (BHP Billiton, January 2007)
1 January 2007Report
This report proposes a site-specific chloride discharge criterion of 1,332 mg/L for discharges from Two Rock Sedimentation Pond related to potential Sable kimberlite pipe mining operations at EKATI Diamond Mine, based on toxicological testing establishing an aquatic threshold (HC5) of 313 mg/L and hydrodynamic modelling demonstrating a dilution factor of 4.26 in Horseshoe Lake over 21-day periods.
Water Quality Effluent Quality Criteria Regulatory Development Plans
Response to EMAB Recommendations Regarding Water Quality Monitoring (Environment Canada, July 2004)
22 July 2004Letter
Environment Canada responds to EMAB recommendations on water quality monitoring at Lac de Gras, explaining the application of national water quality guidelines to site-specific conditions and the process for developing site-specific water quality objectives considering local limnological factors and aquatic communities.
Water Quality Effluent Quality Criteria Correspondence Water Licence
Water Licence N7L2-1616 (MV2003L2-0013) Renewal Public Hearing Binder, Ekati Diamond Mine (BHP Billiton, July 2004)
15 June 2004Report
Public hearing binder for BHP Billiton Diamonds Inc.'s water license renewal (MV2003L2-0013) for the Ekati Diamond Mine, held July 6-7, 2004, containing company presentations, interventions from federal and territorial agencies, and monitoring data on environmental performance over six years of operations.
Regulatory Water Licence Water Quality
Water Licence MV2003L2-0013 Renewal Case File, Ekati Diamond Mine (MVLWB, 2004 to 2008)
2004–2008Report
Water Licence Application MV2003L2-0013 binder for the Ekati Diamond Mine (BHP Billiton — renewal of N7L2-1616). Correspondence with David Scott (BHPB), Jane Howe (BHPB), Bob Wooley (MVLWB), Sarah Baines (MVLWB), Violet Camsell-Blondin (MVLWB Chair). Includes draft Water Licence and Surveillance Network Program (SNP) corrections, sign-posting requirements within 60 days of licence issuance, combined annual quantity volume limits (19,430,000 m³ during construction and dewatering), DFO fish-entrainment-prevention water-intake construction standards. January 7 2004 Distribution List includes Eddy Paul Rabesca (Dogrib Rae Band), Jolene Huskey (Dogrib Treaty 11 Council), Vern Christensen (MVEIRB), Carole Mills (IEMA), Ian Goodwin (BHPB).
Water Licence Regulatory SNP Effluent Quality Criteria
Factors That Modify Toxicity, Chapter 6, Fundamentals of Aquatic Toxicology (Sprague, 1985)
20 March 2002Report
This textbook chapter examines the environmental and physiological factors that modify the toxicity of aquatic pollutants to fish and other aquatic organisms, including the effects of pH, salinity, water hardness, dissolved oxygen, and the complexation of metals in natural waters.
Water Quality Aquatics Monitoring
Dissolved Solids Toxicity Reference Papers (McCulloch, Goodfellow & Black, August 2001)
2001Letter
Dissolved Solids Toxicity reference binder transmitted via fax by Dennis Trotter (Mackenzie Valley Land and Water Board) to Karl Lauten. Includes McCulloch, Goodfellow & Black (1993) "Characterization, Identification and Confirmation of Total Dissolved Solids as Effluent Toxicants" and J.B. LeBlond, L.K. Duffy (2001) "The Science of the Total Environment" study on Fort Knox tailings pond samples using Microtox and algal bioassays, with Red Dog mine station 140 sample precision data and Camo AS Trondheim chemometric modelling references. Topics: TDS toxicity, EC20, Microtox toxicity test system.
Water Quality Effluent Quality Criteria Wastewater
Huckleberry Mines Ltd. Water Quality Monitoring Data, Multiple Sampling Locations (BHP Billiton, 1997 to 2001)
17 July 2001Dataset
Water quality monitoring data from Huckleberry Mines Ltd. (Ekati Diamond Mine) covering multiple sampling locations from 1997 to 2001, including physicochemical parameters, toxicity tests, and dissolved/total metal concentrations tracked across tailings pond, pit, ditch, and creek locations.
Water Quality Monitoring Wastewater Effluent Quality Criteria
Water Quality Standards for Contaminated Sites, BC Water Quality Criteria & Maximum Metal Leaching Effluent Regulations (BHP Billiton, January 1996)
~1996–2001Report
A water quality standards table comparing British Columbia guidelines and maximum limits for contaminants, specifying aquatic life and drinking water thresholds for various substances with hardness-dependent values where applicable.
Water Quality Effluent Quality Criteria Aquatics
Guidelines for the Discharge of Treated Municipal Wastewater in the Northwest Territories (GNWT, 1992)
~1992Report
Approximate date — inferred from filename
The Northwest Territories Water Board published guidelines for the discharge of treated municipal wastewater in the NWT, establishing effluent quality criteria and receiving water quality objectives to protect public health and environmental quality. The document specifies treatment requirements, monitoring protocols, and licensing procedures for municipal waste systems across different receiving environments including streams, rivers, lakes, estuaries, and marine waters.
Wastewater Water Quality Effluent Quality Criteria
Guidelines for the Discharge of Treated Municipal Wastewater in the Northwest Territories (NWT Water Board, 1992)
~1992Report
Approximate date — inferred from filename
The Northwest Territories Water Board's 1992 guidelines establish effluent quality standards and receiving water quality objectives for the discharge of treated municipal wastewater throughout the NWT, incorporating revised criteria based on empirical data and addressing summer/winter discharge differences, operational requirements, and site-specific considerations.
Wastewater Water Quality Effluent Quality Criteria

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