Circular Containment Wall at Reclamation Site
Wolf Remediation Ltd successfully completed a remedial containment wall at a former flare pit site, in Alberta. The site was located 75 meters from a lake, with a water table 1.5 meters below ground level.
Excavation of the flare pit site was complicated by the high water table. Tervita engineers designed a remediation solution for their client that included a circular containment wall and engaged Wolf Remediation Ltd to supply and manage the installation. Built around the original site of the flare pit, the circular containment wall was designed to prevent the high water table from infiltrating the excavation area while the contaminated soils were removed.
To achieve the low permeability required, the original proposal for a slurry bentonite system was exchanged for a vinyl sheet pile containment wall, sealed with a hydrophilic sealant. For this project, vinyl sheet pilings offered value through easy installation and resilience to the contaminants present.
Wolf Remediation Ltd supplied the sheet pilings, and hydrophilic sealant, to obtain the low permeability.
A total of 295 vinyl sheet piles were installed to complete the circular containment wall. Under the expert supervision of Wolf Remediation Ltd, local contractors drove the sheet piles 6 meters into a clay layer, 3.5 meters below ground level, using a mandrel to protect the sheets and make for easier driving.
A slope of 2-1 from the vinyl sheet wall was used during the excavation to achieve wall integrity.
Upon the completion of pumping and disposing of 1200 cubic meters of water in the confined area, a total of 13000 tons of hydrocarbon impacted soils were removed to a depth of 3.75 meters. After removal of all contaminates the void was replaced with clean fill and the sheet pilings were extracted.
Wolf Remediation Ltd composite sheet pile solutions offer an alternative to conventional materials and have a wide range of uses. With a high strength to low weight ratio, composite sheet piling affords easier handling, more economical shipping, lower maintenance on installation, and a longer life-span. An environmentally sensitive solution with no compromise.