The site for the London Olympics 2012 was located in an area which had been subject to intense industrial activity for centuries, causing widespread contamination of soil and groundwater in the area. The regeneration of this disused industrial site and the Lasting Legacy that would be provided following the event was one of the key factors in London being chosen as the host city for the Olympics.
In July 2006 DEC was appointed to the Framework Contract for Demolition and Remediation Works, where it was selected for:
Dredging and Sediment Treatment
Following the appointment to the Framework Contract, DEC won contracts for soil washing in two areas. Soil washing works commenced on one site in June 2007 where DEC deployed one of its in-house developed soil washing plants and some 30,000 tonnes of soil were treated. The principle contaminants encountered included hydrocarbons and heavy metals.
In November 2007 work on the other site commenced with the construction of a Soil Treatment Centre. DEC provided all of the remediation technology for the Treatment Centre, which included soil washing, bioremediation and stabilisation/solidification technology. The Soil Treatment Centre was required to treat in excess of 500,000 tonnes of contaminated soil before the end of 2008. An additional contract for the treatment of another 600,000 tonnes of contaminated soil was awarded from 2009 until the summer 2010. After completion of the works, the site was handed back to the client for the construction of the sporting facilities.
These remediation works minimised the amount of material being disposed off and maximised the reuse of materials on site. All the treated material was reused in preparation of the development platform for the event.