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The 8 hectare former gasworks site at Willoughby Lane had been operational for over 100 years resulting in several distinct sources of contamination, notably; arsenic, cyanide, hydrocarbons, VOC’s and PAH’s in the soils and Dense & Light Non-Aqueous Phase Liquids in the groundwater. The site required remediation to enable it redevelopment as part of a large strategic scheme, Meridian Water, designed to rejuvenate this area of London with the construction of 725 new homes and a new railway station The level of contamination of the soils posed a significant challenge for bioremediation. Conventional groundwater treatment to deal with DNAPL and LNAPL would also require the pumping and treatment of huge volumes of water; alternative techniques were therefore sought to deliver a sustainable of cost effective solution for the site.
Cognition was appointed by Enfield Council to carry out the following remediation works:
Cognition successfully completed the bioremediation works in accordance with the bulk fill criteria and method statement. The bioremediated soil also passed the visual and olfactory assessment. Naphthalene, which was considered to be the most onerous of the contaminants of concern, was reduced from an initial average level of 1,108mg/kg to just 9mg/kg which was well below the criteria limit of 108mg/kg. The NAPL recovery information has been presented in a number of site clearance reports to demonstrate that it no poses a significant environmental risk to the environment. The project has demonstrated that the combination of risk assessment and innovative remediation techniques can bring seemingly challenging contaminated sites back into use; this project has been recognised within the remediation industry as an example of sustainability and best practice, winning the national Brownfield Briefing Awards Project of the Year 2019.