Contaminated Land Capping

Brownfield Drainage, Pozidrain, Honda Car Park, Avonmouth, UK

Project Information

Client:Honda
Contractor:GSE Group
Consultant:Aspinwall
Product:Pozidrain 6S250D/NW8
Quantity72,000m2
Benefits:- Drainage & capping membrane
- High flow capacity
- Double textile for adequate reinforcement & separation
- Rapid installation
- Replaced 10,800m3 drainage stone


Project Description

The Honda Factory Car Park site is located on the land bordering the mouth of the River Avon, near Bristol. This part of Avonmouth is one of the most contaminated sites in south-west England. It has a long industrial history as a munitions and mustard gas plant in 1917, zinc, lead and sulphuric acid production until 1972 and production of agrochemicals and pharmaceuticals until 2008, when the site was closed.  Site investigations undertaken during the planning application process for redevelopment of the site detected numerous contaminants.

The Challenge

The requirement was to minimise the use of the costly type 1 stone material and design a capping solution that would enable fast installation on this large area. The traditional geosynthetic capping system comprising protection textiles, impermeable membrane and drainage stone was considered outdated and costly. 

Cost saving innovative design was required to enable economic redevelopment of this contaminated site. A key aim of the development strategy was to minimise off-site disposal and enable the contaminated materials to remain on site.

Site investigation identified multiple contaminants on this site. This was representing a significant risk for the pollution of the ground water if rainfall and surface water were allowed to percolate into contaminated sub-formation. Effective capping and drainage membrane was required in order to enable this contamination to remain on site and avoid significant costs associated with dig and dump option. 

The developer approached Aspinwall consultancy to design a cost effective contaminated land remediation solution for this environmentally sensitive location..

The Solution

The designer was working with ABG to develop a cost effective geosynthetic capping solution. Aspinwall carried out the design using Pozidrain 6S250D/NW8 drainage geocomposite to provide combined drainage, separation, capillary break, reinforcement and capping all in one geocomposite layer. Pozidrain is permeable on one side only, the other side of the cuspated drainage core is flat and impermeable allowing Pozidrain drainage geocomposite to also act as a capping membrane. 

Tensile strength of the geocomposite layer was used to provide reinforcement and enable the sub-base thickness to be reduced from 300mm to 150mm, reducing the volume of the required stone layer by 10,800m3. Pozidrain geocomposite was installed on top of the contaminated sub-formation and covered with 150mm of type 1 material and permeable asphalt overlay. 

Proven chemical resistance in landfill applications ensured Pozidrain was adequate for this contaminated land site. The design and installation was approved by the Environment Agency.

Brownfield Drainage and Landfill Capping with ABG Pozidrain geocomposite

ABG Pozidrain

Plant operating on 150mm of Type 1 backfill materialPlant operating on 150mm of Type 1 backfill material
Large Pozidrain rolls enabled rapid installationLarge rolls enabled rapid installation
Pozidrain geocomposite drain below porous asphaltPozidrain geocomposite drain below porous asphalt

The ABG Service

ABG provided technical advice and design assistance on this project. This included supervision during the installation and liaison with the Environment Agency.

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

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

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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