AN ALTERNATIVE solution for a remediation project in the North Yorkshire moors eliminated more than 1,500 lorry movements and reduced the environmental impact of the clean-up.
Carlton Bank was severely scarred by fluorspar workings in the last century. Restoration involved regrading and repositioning 500,000m 3of material from the base to the centre of the hillside. For stability, the final design had to deal with groundwater flows below the regraded fill but instead of a 300mm thick drainage blanket, it was decided to use a geocomposite drainage layer.
Geosynthetics manufacturer and supplier ABG Geosynthetics supplied 60,000m 2of its Finesse Pozidrain geocomposite for the works. This gave the flow capacity and eliminated 32,000t of imported crushed stone, preserving natural resources and reducing traffic through the picturesque village of Carlton.
The geocomposite is made from polymer taken from landfill input and the firm claims that it achieved a 50% cost saving for the client. And while the contractor had not laid this sort of material before, the installation team was soon laying more than 5,000m2 a day.