The Challenge
Reclaiming land from the Lekki lagoon margin required containment of dredged fill and prevention of saline water ingress into newly formed land parcels, on a site with continuous tidal movement and soft alluvial mud.
Our Solution
Willem Olaf supplied 1.5 mm HDPE geomembrane as a containment liner along the bund walls and cell floors, welded on site by wedge and extrusion methods, with a non-woven geotextile cushion layer protecting the liner from the underlying mud and any debris in the dredged fill.
The Outcome
Over 40 hectares of reclaimed land were lined and contained within a single dry-season programme, with zero reported liner failures during the first full rainy season after handover.
The Challenge
A new engineered landfill cell near Epe needed a containment system that would meet environmental regulations for leachate isolation in an area with a high water table and sandy, free-draining soils prone to seepage.
Our Solution
A 1.5 mm HDPE geomembrane primary liner was installed across the cell base and side slopes, underlain by a geosynthetic clay liner (GCL) for secondary containment, with a drainage geocomposite placed above the primary liner to form the leachate collection layer and route flow to collection sumps.
The Outcome
The completed cell passed independent construction quality assurance (CQA) testing on all liner seams, with the lining system designed for a 50-year containment life and no observed leachate breakout in the first 18 months of operation.
