Elkem decontamination plan | “Acceptable” for Quebec, insufficient for the BAPE

Nearly three decades after demanding it, Quebec has just authorized the restoration of the bank of the St. Lawrence River near the former Elkem Métal Canada factory in Beauharnois, heavily contaminated with heavy metals, a project which had yet was deemed clearly insufficient by the Office of Public Hearings on the Environment (BAPE) in 2010.


The Legault government adopted in November the decree approving the company’s restoration plan, which plans to leave the majority of the contaminated soil on site, on the site where it produced ferromanganese, an iron and iron alloy, until 1991. of manganese used in steel production.

This restoration was required… in 1995, by the government of Jacques Parizeau, when Elkem Métal Canada, a subsidiary of the multinational Elkem, sold its property.

For years, the plant’s owners had used massive smelting residue (slag) to level and solidify the bottom of the land, including segments of the shoreline bordering Lake Saint-Louis, which constitutes the widening of the river at this location, explains the environmental analysis report of the restoration project, produced by the government.

These massive smelter residues are contaminated primarily by manganese, a neurotoxic contaminant with lead-like effects, as well as other heavy metals and polycyclic aromatic hydrocarbons (PAHs).

Contaminants buried on site

The Elkem restoration plan, which the Legault government decree describes as “environmentally acceptable, under certain conditions”, plans to remove some 7,300 cubic meters (m⁠3) of contaminated fill and “confine” the rest on site by covering it with “clean soil”.

The BAPE, which looked into the project in 2010, rejected this option and concluded “the need to remove all the embankments and slag blocks from the bank”, which it estimated at approximately 21,400 m⁠3.


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