Epe Landfill Cell Lining

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.

Abuja Mixed-Use Basement Drainage

The Challenge

A mixed-use development in Abuja included two basement levels excavated below the seasonal water table, requiring reliable drainage behind retaining walls to prevent hydrostatic pressure build-up and water ingress into finished basement spaces.

Our Solution

A drainage geocomposite was installed against the full height of the retaining wall structure, channelling groundwater down to a perimeter drainage collector connected to the building's sump pump system, replacing the thicker granular drainage blanket specified in the original design.

The Outcome

The drainage retrofit reduced the excavation width required behind the retaining walls by 300 mm per side, and the basement levels have remained dry through two full rainy seasons since handover.

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