Notice of Determination

February 19, 2025 – ADM Aéroports de Montréal has determined that the project for the road network and parking lots at YUL Montréal-Trudeau International Airport is not likely to cause significant adverse environmental effects by applying the mitigation measures planned for the project.

This determination was based on a consideration of the following factors:

• Technically and economically feasible mitigation measures listed below;
• Community knowledge;
• Indigenous knowledge and impacts on rights of Indigenous peoples.

The mitigation measures considered for this determination are as follows:

Surface water quality:

• Implement and maintain effective measures to limit sediment input and transport.
• Implement a stormwater quality monitoring program.
• Maintain and refuel machinery more than 30 m from ditches.
• Ensure that there is an oil recovery kit near each piece of equipment.
• In the situation where the environmental quality of the soil is not known, pile the excavated soil on an impermeable surface and cover it with an impermeable membrane.

Groundwater quality:

• Characterization of water from the drilling of wells and excavations and discharge of water to the sanitary sewer system, in compliance with By-law 2008-47 of the City of Montreal.

Air quality:

• Maintain vehicles and machinery in good working order.
• Spread dust suppressant in unpaved areas if there is a significant presence of dust. Water must be used at a distance of less than 10 m from ditches.
• Clean traffic lanes soiled by the work.

Soil quality:

• Prohibit access to the site to any mobile equipment that leaks hydrocarbons.
• Perform maintenance on equipment in impermeable areas provided for this purpose.
• If necessary, characterize the soils in piles to determine their management method.

Invasive alien species:

• Ensure that machinery is clean and free of IAS upon arrival at the site and maintain it in this condition thereafter.
• Apply best practices for the management of invasive alien species.

Avifauna and habitat:

• Respect for the nesting period of migratory birds for deforestation.
• Check for wildlife just before the work begins.

Environmental emergency:

• Apply ADM's Environmental Incidents Directive and Aéroports de Montréal's Emergency Response Plan (ERP).

General:

• Apply the Environmental Requirements for construction work developed by ADM.

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