Section Synopsis
Pages: 216-218The document provides a preliminary screening of air quality impacts for the Deep Geological Repository (DGR) project, identifying potential emissions of Criteria Air Contaminants (CACs) such as particulate matter, nitrogen oxides, and volatile organic compounds. It concludes that while project activities will generate emissions, the overall risk is 'low' due to the anticipated effectiveness of standard mitigation measures and regulatory oversight, despite the fact that site-specific air dispersion modelling has not yet been conducted.
Community Assessment Narrative
The text demonstrates a high degree of confidence in the efficacy of standard mitigation strategies, often presenting 'low risk' conclusions as foregone conclusions rather than outcomes of empirical study. By relying on the 'well-established' nature of industry practices, the proponent bypasses the need for site-specific data in this initial phase. There is a notable reliance on the 500m to 1km settling radius for dust, which may not fully account for the unique micro-climates or the specific chemical composition of emissions from deep-rock blasting and heavy diesel equipment used in a DGR context. The narrative structure prioritizes regulatory compliance and procedural adherence (NSCA, REGDOCs) as a proxy for environmental safety, which may obscure specific local vulnerabilities.
Corrective Measures & Recommendations
The proponent must prioritize the completion of site-specific atmospheric dispersion modelling using at least three to five years of on-site meteorological data to validate the 'low risk' assertion. This modelling should specifically account for the 'valley effects' or specific terrain features of the Ignace site that could lead to temperature inversions and localized pollutant trapping. Furthermore, the NWMO should establish a baseline for trace metals and polycyclic aromatic hydrocarbons (PAHs) in the soil and local vegetation prior to construction to enable accurate post-operational monitoring. It is recommended that the Human Health and Ecological Risk Assessment (HHERA) include a specific 'Traditional Land Use' scenario developed in direct collaboration with the Wabigoon Lake Ojibway Nation (WLON), focusing on the bioaccumulation of CACs in culturally significant species. Finally, the proponent should implement a real-time, publicly accessible air quality monitoring network at the project boundary to provide transparency and immediate data for the Township of Ignace and Indigenous communities, ensuring that 'best available technology' is not just a regulatory checkbox but a functional operational safeguard.
On 16 February, 2026 the Impact Assessment Agency of Canada (IAAC), with input from the Canadian Nuclear Safety Commission (CNSC), published a Summary of Issues (SOI) for the proposed Deep Geological Repository (DGR) for Canada’s Used Nuclear Fuel Project, put forward by the Nuclear Waste Management Organization (NWMO). The SOI identifies the key issues that IAAC considers relevant to the federal integrated impact assessment process for the project. NWMO’s response to the SOI will assist IAAC in determining whether an impact assessment is required under section 16 of the Impact Assessment Act. If an impact assessment is required, the issues outlined in the SOI—together with NWMO’s response—will help shape the scope of the assessment and inform the continued development and finalization of the Integrated Tailored Impact Statement Guidelines and associated plans.
Alignments to IAAC Summary (SOI)
Based on the review of Melgund Township’s community findings regarding air quality and the IAAC Summary of Issues (SOI), the following alignments and observations are noted:
Melgund Township’s concerns regarding the generation of Criteria Air Contaminants (CACs) and the lack of site-specific data align with the IAAC SOI, specifically within Annex A: Additional Comments, Guidance and Recommendations. In this section, the Agency explicitly documents a request for the "monitoring of effects during construction and operations on air, water, soil and from blasting." This validates the community's observation that construction-phase emissions are a significant area of concern that requires active oversight. Furthermore, the community's identification of a gap regarding the Human Health and Ecological Risk Assessment (HHERA) is supported by the IAAC’s entry under Health, Social, and Economic Conditions, which notes specific concerns regarding "uncertainty due to limited or inadequate baseline health data."
However, a distinction exists in the specificity of the concerns. The IAAC SOI focuses heavily on Radiological Conditions, citing "Radiological effects to the... atmospheric environment." Melgund Township’s analysis provides a critical non-radiological technical nuance, flagging that fine particulates (PM2.5) from standard construction activities may travel beyond the Proponent’s generalized "500m-1km settling distance." The community’s finding that the "low risk" designation is currently unsubstantiated by site-specific dispersion modelling reinforces the IAAC’s broader observation under Indigenous Peoples — Current use of lands and resources, which flags "limited, inaccurate, or missing baseline data available to accurately predict effects." The community analysis effectively fills a gap in the SOI by challenging the technical assumptions used to justify preliminary risk ratings, rather than just the risks themselves.
Recommendations
The working group recommends that the Proponent be required to finalize and publicly release site-specific air dispersion modelling and the HHERA prior to the formal categorization of risk levels in the Impact Statement. This recommendation directly addresses the "uncertainty" and "baseline data" gaps identified throughout the IAAC Summary of Issues. By requiring empirical evidence rather than industry generalizations to validate the "low risk" status of air quality, the Proponent can satisfy the Agency's documented concerns regarding the adequacy of the Project Description and the transparency of risk characterization.
Furthermore, the establishment of a community-led air quality monitoring committee, inclusive of the Wabigoon Lake Ojibway Nation and the Township of Ignace, is recommended to address the IAAC’s identified issue regarding Monitoring and institutional control. This committee would ensure that "receptors" for the HHERA are defined based on local usage and cultural significance, directly responding to the IAAC’s call for the "Consideration of Indigenous Knowledge" in project planning. This collaborative governance model would mitigate the specific concern listed in the SOI regarding "transparency in reporting monitoring results" and ensure that non-radiological air quality impacts are not overlooked during the long-term assessment.
Key Claims
Underlying Assumptions
Critical Observations & Gaps
Analysis Table| Issue Identified | Implication | Information Required |
|---|---|---|
| Absence of site-specific air quality modelling data. | The lack of dispersion modelling means the 'low risk' designation is currently a hypothesis rather than a proven fact. | Immediate execution of AERMOD or CALPUFF modelling using site-specific data. |
| Pathways of change identified for multiple VCs including surface water and wildlife. | CACs can deposit into local water bodies and soil, potentially affecting Species at Risk (SAR) and fish habitats. | Integrated monitoring plan linking air deposition to water and soil quality. |
| Potential impacts on Indigenous health and traditional resource use. | Indigenous health and traditional land use are sensitive to even minor changes in air quality and perceived contamination. | Collaborative definition of 'acceptable risk' with Indigenous partners. |
Working Group Recommendations
Formally oppose the Proponent's proposal to limit the Impact Assessment Act (IAA) review only to components with 'moderate to extreme risks,' thereby attempting to exclude Air Quality based on a preliminary 'Low Risk' screening.
Require the inclusion of Melgund residents and seasonal land users as distinct 'sensitive receptors' in the upcoming Human Health and Ecological Risk Assessment (HHERA), ensuring they are not aggregated with the Township of Ignace.
Challenge the Proponent's reliance on generic industry data (MECP 2017) which assumes emissions settle within 500m to 1km, and demand the immediate completion and peer review of site-specific air quality dispersion modelling.
Understanding the Impacts of Nuclear Waste on our Community
This digital archive houses the public comments submitted to the Impact Assessment Agency of Canada regarding Project 88774: The Nuclear Waste Management Organization Deep Geological Repository (DGR) for Canada's Used Nuclear Fuel Project. The impact assessment is led jointly by the Impact Assessment Agency of Canada and the Canadian Nuclear Safety Commission. This archive preserves community perspectives, concerns, and observations shared during the assessment process, particularly in relation to Melgund Township, Northwestern Ontario and the communities of Dyment and Borups Corners who are the closest and most impacted of all in the process.