Sundon Landfill is located in the green belt area near Luton in Bedfordshire. For over two decades this was one of the main landfill sites for the Bedfordshire area used for tipping of mixed waste, including large volumes of domestic refuse. The plan area of the landfill was in excess of 400,000m² with a maximum waste depth of 40m. The site needed to be permanently capped, restored and remediated to accommodate a country park, with public footpaths, areas of grassland, native trees and shrubs.
Bedfordshire County Council approached Robert Long Consultancy to design a final capping system and supervise the restoration of this large landfill site.
In 1997 Sundon Landfill ceased operating and it required capping with a permanent geosynthetic solution and 1m of soil cover. The objective was to eliminate the use of costly drainage stone and design a capping solution that would enable fast installation over this large area.
A large proportion of this landfill cap was on 1 in 4 slopes, where it was necessary to ensure slope stability during construction.
Robert Long Consultancy and Bedfordshire County Council worked with ABG to develop a geosynthetic capping solution that would provide adequate drainage and frictional performance for slope stability. Pozidrain 7S250D/NW8 geocomposite drainage layer was specified and installed on top of the 1mm LLDPE textured membrane.
All capping phases were completed between 2001 to 2004 without any stability problems during construction. Throughout the construction and after completion of the installation, drainage performance was monitored and reported to be as expected on this large landfill cap.
The ABG Service
ABG provided technical advice and design assistance on this landfill capping project. This included shear box testing, slope stability and flow capacity calculations.
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