Public Comment Period on Intent to Make a Determination
Installation of a Permeable Adsorptive Barrier (PAB) at 22 Wing North Bay

April 28, 2026 — The Department of National Defence must decide whether the proposed project is likely to cause significant adverse environmental effects.

To help inform this decision, the Department of National Defence is inviting comments from the public on the project and its potential effects on the environment. All comments received will be considered public. For more information, individuals should consult the Privacy Notice on the Registry website.

Written comments must be submitted by May 17, 2026 to:
Directorate of Contaminated Sites, 22 Wing North Bay (Department of National Defence)
E-mail:  NorthBayPFAS-NorthBayPFAS@forces.gc.ca

The Proposed Project

The Department of National Defence (DND) is proposing a project. DND is proposing to install a 250 m long in-situ permeable adsorptive barrier (PAB) to remediate groundwater impacted by per- and polyfluoroalkyl substances (PFAS) within the bedrock valley at 22 Wing North Bay. Pilot-scale testing will be conducted to evaluate the performance of colloidal activated carbon (CAC) products followed by full-scale implementation and long-term monitoring.

Project activities will include:

• Installing upgradient and downgradient groundwater monitoring wells to assess conditions pre- and post-injections.
• Injecting CAC at select intervals to a depth of approximately 5-15 m below ground surface for a distance of up to 70 m for the pilot and approximately 250 m for the full-scale.
• Site restoration through landscaping, revegetation and contouring with existing grades as required.
• Long term groundwater monitoring to assess ongoing performance of the PAB.