Demolition of the Portneuf Wharf and Sediment Remediation

The Portneuf port infrastructure was built between 1956 and 1962. It consists of a long pier of approximately 950 linear meters and a wharf head mainly mostly made of a creosote wood structure. These wooden boxes are surmounted by concrete weight walls and it's main facade is made of steel sheet piles. The wharf's backfill and the surrounding seabed are contaminated mainly by polycyclic aromatic hydrocarbons (PAH) and mercury.

The present project is a remediation project which requires the demolition of the wharf, which is the source of the PAH contamination, and the remediation of the seabed.  Also, the wharf structure is currently in a state of advanced degradation and is prohibited from public access. Therefore the demolition of this structure will eliminate the safety risks associated with its presence.

The activities to be carried out within the project are:

- mobilization and other preparatory work;

- installation and removal of a protective enclosure (downstream part of the structure);

- the complete demolition of the head of the wharf;

- the dredging of contaminated sediments (16,125 m3);

- installation of an embankment for stability/environmental covering on certain areas of the seabed;

- transshipment, dewatering, sorting of cuttings and/or materials taken out of the water and sound management of leachate water;

- the transhipment and transport of demolition debris and contaminated sediment to an authorized treatment site;

- the construction of a 50 m long breakwater at the end of the demolished infrastructures, as well as a 20 m long riprap on the west side;

- refueling and maintenance of machinery;

- management of residual materials and contaminants.

The work will take place between June 2023 and December 2026.

Disclaimer

This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.

 

Latest update

The public consultation period for the project has ended. Transport Canada and Fisheries and Oceans Canada are continuing the environmental assessment of the project to determine if it is likely to cause significant adverse environmental effects.

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Key documents

Key documents
Document Number Document Title File Date
1 Public comment period on intent to make a determination - November 29, 2022

Contacts

Environmental and Aboriginal affairs - Québec region
Email: aea-eaa@tc.gc.ca


  • Location

    • Portneuf Wharf (Quebec)

  • Nature of Activity

    • Ports and Harbours

  • Assessment Status

    In progress

  • Start Date

    2022-11-29

  • Proponent

    Transport Canada

  • Authorities

    • Fisheries and Oceans Canada
    • Transport Canada

  • Assessment Type

    Project on federal lands

  • Reference Number

    84140

Nearby assessments

...within 200 kilometres
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