Notice of Determination

September 29, 2025 – ADM Aéroports de Montréal has determined that the project for the replacement of a section of the airport site fence at YUL Montreal-Trudeau International Airport is not likely to cause significant adverse environmental effects by applying the mitigation measures provided for in the project.

This decision is based on the following factors:

• Mitigation measures that are technically and environmentally feasible below;
• Community knowledge;
• Knowledge and impacts on the rights of Indigenous peoples.

The mitigation measures considered in this determination are as follows:

Construction and machinery management

• Circulate only on defined routes within the intervention zones.
• Minimize topsoil and vegetation removal.
• Avoid moving or storing materials on the preserved living vegetation.
• Use biodegradable oils in motorized equipment within 30 m of water environments.
• Refuelling, maintenance and washing of machinery more than 30 m from water environments.

Vegetation protection

• Preserve existing vegetation (trees, shrubs, herbaceous plants) that does not interfere with the work.
• Limit deforestation and avoid disturbance of adjacent vegetation.
• Cut roots and branches cleanly.
• Rearrange weathered areas to promote natural recovery without leaving the soil bare.
• Restore vegetation on compacted areas to improve infiltration.

Materials and debris management

• Transport trunks and debris to identified storage areas without damaging vegetation.
• Quickly transport wood waste to an authorized disposal site.

Invasive Species Control

• Excavate soils with rhizomes for small clones and send them to landfill or bury clones in place under 1 m of healthy clay soil without rhizomes.

Protection of water environments

• Restore riparian and littoral buffers with the same substrate or adapted native species.
• Implement measures to limit the input of sediment to watercourses, ditches and storm sewers.
• Maintain the effectiveness of measures during periods of flooding, rain or frost.
• Strip to minimize erosion.
• Protect outfalls from erosion (e.g., riprap, energy dissipators).
• Divert runoff water to sediment collection facilities.
• Protect disturbed ditches to prevent the migration of contaminants (e.g., membranes).

Planning and compliance

• Define the work methods in the contractor's environmental protection plan.
• Comply with the criteria of the MELCCFP's Regulation 2008-47 respecting water treatment.
• Provide protective and recovery equipment in case of spills.

Accordingly, ADM Aéroports de Montréal may exercise its powers to enable the project to be carried out.