PROJECT
Clean-up and remediation of the former Cap-Blanc Landfill, Anticosti Island
SERVICE
INDUSTRY
Municipal
PROJECT LOCATION
Anticosti Island, Qc
PROJECT DATE
2022
QUANTITY
123 m3 of soil disposed
CHALLENGES
The main challenges consisted in stabilizing the oceanfront embankment and disposing of the soils and materials by maritime transport.
BACKGROUND
The site, which borders Ellis Bay, is a former landfill managed by the MERN that served over a long period to bury domestic and industrial waste. The oceanfront embankment on the site was eroded at the base (bluff) by waves, ice, and the tide. This erosion posed an issue, as it caused instability in the slopes and landslides that dragged the wastes and soils to the base, onto the shore, and into Ellis Bay. In 2021, as part of a public RFP, SANEXEN was retained by the MERN as the site remediation contractor.
Over the past century, volumes of wastes varying in origin (construction, residential, hunting and fishing) and soils from Anticosti Island had been dumped on the central portion of the site and the bluff. Previous environmental studies revealed soils contaminated at concentrations above Schedule II of the LPRR and Schedule I of the RRBCS, and the presence of hazardous and non hazardous residual materials covering a large area of the site.
Over the past century, volumes of wastes varying in origin (construction, residential, hunting and fishing) and soils from Anticosti Island had been dumped on the central portion of the site and the bluff. Previous environmental studies revealed soils contaminated at concentrations above Schedule II of the LPRR and Schedule I of the RRBCS, and the presence of hazardous and non hazardous residual materials covering a large area of the site.
SOLUTION
- Excavation and off site management of residual materials and contaminated soils by a combination of maritime and truck transportation. The material was transported from Anticosti Island to the approved disposal facilities (Signaterre and Stablex);
- Stabilization of the oceanfront embankment through the excavation of the problematic soils covering the bedrock, as well as the creation of a 5 m safe zone atop the embankment;
- Surface profiling after backfilling using soils containing less than 2% site debris over an estimated 50,000 m² to meet the landowner’s requirements, and allow for adequate drainage;
- Seeding the area.
PROJECT HIGHLIGHTS
- Off site disposal in approved facilities of approximately 145 m³ of HRMs and 125 m³ of soils;
- Off site management, at the Anticosti Island trench disposal site, of an estimated 645 m³ of non hazardous residual materials.
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