Landfill Cap Drainage & Gas Venting

Pozidrain, Chelson Meadow Landfill Site, Plymouth, UK

Project Information

Client:Plymouth City Council
Contractor:McArdle/May Gurney/Morrison
Consultant:Pell Frischmann
Product:Pozidrain 6S250D/NW8 Geocomposite
Claymat GCL
Quantity900,000m2 Pozidrain
450,000m2 Claymat
Benefits:- High flow capacity in both directions
- Excellent geomembrane protection
- Large rolls for rapid installation
- Adequate frictional performance for slope stability


Project Description

Plymouth Council's Chelson Meadow Landfill Site is located on the land bordering the estuary of the River Plym, in Devon, England. For more than four decades Chelson Meadow was the main landfill site for the Plymouth area.

The Authority approached Pell Frischmann to design a final capping system for this environmentally sensitive location. The site is next to the National Trust's Grade 1 listed Saltram House and the old tip was seen as an eyesore to visitors.
The work to return the landfill site to grassland was a legal requirement by the Environment Agency.

The Challenge

An estimated 17,650,000 tonnes of landfill needed to be capped with a permanent geosynthetic capping system and 0.5m of soil cover.

The first capping phase was in 2005 and the site needed to be permanently capped and closed by 2012. The requirement was to eliminate the use of expensive drainage stone and design a cost effective geosynthetic capping solution that would comprise geocomposite drainage and protection layer, impermeable membrane and gas venting geocomposite. A large proportion of the landfill cap was to be constructed on steep slopes where it was necessary to ensure slope stability during construction.

The Solution

The designers were worked with ABG to develop a geosynthetic capping solution that would provide adequate drainage, gas venting, membrane protection and frictional performance to ensure slope stability.

Pozidrain 6S250D/NW8 geocomposite was specified and installed above and below the Claymat GCL to provide drainage, gas venting and adequate protection. The thickness of the cover soil was 0.5m on all capping phases. Pozidrain geocomposite provided the required flow capacity and interface shear strength to achieve stability on 1 in 3.5 slopes. Gas from the landfill site was harnessed and used to power six gas turbines for generating energy to go back into the national grid. From 2005 to 2012 Chelston Meadow landfill site has been restored and landscaped into an area of grassland with the long-term plan for recreational use.

ABG Pozidrain Drainage Geocomposite for landfill capping applications

ABG Pozidrain Drainage Geocomposite

The ABG Service

ABG provided technical advice and design assistance on all capping phases. This included site specific shear box testing, slope stability and flow capacity calculations.

Contact ABG today to discuss your landfill capping or drainage project specific requirements and discover how ABG past experience and innovative products can help on your project.

The large rolls of ABG Pozidrain geocomposite enabled rapid installationLarge Pozidrain geocomposite rolls enabled rapid installation
ABG Claymat GCL installed between Pozidrain geocompositesClaymat GCL installed between Pozidrain geocomposites
Adequate interface friction ensured slope stability when using ABG GeosyntheticsAdequate interface friction ensured slope stability
Aerial view of the landfill siteAerial view of the landfill site


Claymat

Claymat GCLs are used to provide a liquid and/or gas barrier in a wide range of environmental and civil engineering applications where containment barriers are required.

more...

Claymat

Pozidrain

Pozidrain drainage geocomposite is a wide-width preformed drainage and gas venting solution, providing a sustainable, environmental alternative to traditional filter stone drainage layers. Used extensively for landfill and contaminated land drainage on slopes and basal areas to remove water, liquids and gas quickly & efficiently.

more...

Pozidrain Drainage geocomposite for landfill drainage and capping from ABG Geosynthetics
 

Products

Claymat

Claymat GCLs are used to provide a liquid and/or gas barrier in a wide range of environmental and civil engineering applications where containment barriers are required.

more...

Claymat

Pozidrain

Pozidrain drainage geocomposite is a wide-width preformed drainage and gas venting solution, providing a sustainable, environmental alternative to traditional filter stone drainage layers. Used extensively for landfill and contaminated land drainage on slopes and basal areas to remove water, liquids and gas quickly & efficiently.

more...

Pozidrain Drainage geocomposite for landfill drainage and capping from ABG Geosynthetics
 

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