Revell DGR: Assessing the Eels

what about the eels?

As a Senior Regulatory Intelligence Analyst, I have conducted a deep-dive review of the Nuclear Waste Management Organization (NWMO) submissions regarding the Revell Site Deep Geological Repository (DGR). A critical, recurring concern in the public registry and technical documentation is the potential impact on aquatic ecosystems, specifically the American eel (Anguilla rostrata), which has been identified in preliminary environmental DNA (eDNA) studies [Ref: 14.11.1].

Executive Summary

The presence of the American eel, a species designated as Threatened by COSEWIC and Endangered under the Ontario Endangered Species Act, represents a significant regulatory and ecological red flag. The proponent’s current baseline data relies on eDNA metabarcoding, which the NWMO itself admits is 'difficult to interpret' and requires 'ground-truthing' [Ref: 14.11.1]. The potential for project-related activities—such as blasting, water withdrawal, and effluent discharge—to impact this species is currently characterized as 'low risk' based on preliminary, non-validated data. This conclusion is premature and fails to meet the precautionary principle required for a project of this magnitude.

Detailed Analysis

The Revell site is located within the Canadian Shield, a region characterized by complex, interconnected watersheds. The identification of the American eel in the project area, even if preliminary, necessitates a shift from desktop-based screening to intensive, site-specific field validation. The current reliance on eDNA without physical confirmation (netting or electrofishing) is a major technical deficiency [Analysis: 14.11.2]. Furthermore, the proponent’s 'pathways of change' screening identifies that project activities could alter hydrology and water quality, yet it dismisses the significance of these changes by citing 'industry-standard mitigation' [Ref: 19.2.3.7]. This dismissal ignores the specific biological sensitivities of the American eel, which is highly susceptible to changes in water velocity, sediment transport, and chemical composition.

Evidence from Public Registry

Public sentiment regarding the project's impact on water quality is overwhelmingly negative and deeply rooted in a fear of irreversible environmental damage. Commenters frequently cite the interconnectedness of the Wabigoon and Rainy/Turtle River watersheds [Ref: 392, 456]. The specific concern for aquatic life is a recurring theme, with residents and Indigenous rights-holders expressing fear that the repository will 'poison' the water systems that sustain traditional harvesting and biodiversity [Ref: 578, 592]. The exclusion of transportation risks from the environmental impact statement is viewed by many as a strategic attempt to avoid addressing the potential for catastrophic spills into these sensitive aquatic corridors [Ref: 612, 609].

Technical Deficiencies & Gaps

Our internal technical review identified the following gaps:

• Lack of Ground-Truthing: The proponent has not conducted physical surveys to confirm the presence of the American eel, relying instead on eDNA results they simultaneously label as 'uncertain' [Ref: 14.11.1].
• Inadequate Baseline: The current baseline data for fish and fish habitat is based on limited field studies (2021-2022) and desktop reviews, which are insufficient to characterize the full life-cycle requirements of sensitive species [Ref: 14.8.1].
• Mitigation Ambiguity: The commitment to avoid 'harmful alteration' is qualified by 'to the extent practicable,' which provides no concrete protection for aquatic habitats [Ref: 19.2.3.7].

Recommendations & Mandates

We strongly recommend that the NWMO immediately initiate a comprehensive, multi-season field survey program to physically verify the presence and distribution of the American eel. This program must be co-designed with local Indigenous Knowledge holders to ensure that traditional ecological knowledge regarding fish movement and habitat is fully integrated into the study design.

We strongly recommend that the proponent establish a 'Zero-Harm' threshold for aquatic habitats within the project's immediate vicinity. This threshold should be supported by real-time, independent water quality monitoring that is accessible to the public and Indigenous partners. Any deviation from baseline water quality parameters must trigger an immediate, pre-defined adaptive management response, rather than relying on post-hoc mitigation.

Conclusion

The potential presence of the American eel is a critical indicator of the project's ecological risk. The current 'low risk' characterization is not supported by sufficient empirical data. Until the proponent can definitively prove that the project will not jeopardize this endangered species, the regulatory process must remain in a state of heightened scrutiny. The path forward requires a transition from 'early conclusions' to verified, site-specific scientific evidence.