New Life for Contaminated Land in Croydon UK
Contaminated land remediation specialist Envirotreat are currently undertaking the installation of a Soil Mixed Reactive Barrier System (SMRBS) at a former coal gasification site in Croydon UK for Barratt (Kent) in what will form a forward thinking and exciting new site 5.3ha combined Commercial and Residential property project.
Working alongside Piling Contractor Miller Piling and Consultant Engineers White Young Green Environmental, Envirotreat have not only designed, but are also installing a total of three barriers utilising their proprietary E-clay® process to treat contaminated groundwater as it migrates off-site.
The system at Croydon combines two “passive” barriers (130m and 100m long) and one 65m long “active” section and in essence the overall design stabilises existing onsite contamination as well as protecting the local culverted section of the River Wandle.
The SMRBS at Croydon is being installed in-situ by advanced soil mixing techniques using a continuous flight auger system. The E-clay® process treatment slurry is produced on site and thereafter pumped down the hollow stem of the auger to form groundwater treatment columns.
The main contaminates identified at Croydon were Total Petroleum Hydrocarbons (TPH), Polycyclic Aromatic Hydrocarbons (PAH), Benzene, Toluene, Ethylbenzene, Xylene (BTEX), Arsenic, Ammonia and Cyanide. Envirotreat designed the barrier system using the simulation program MODFLOW in order there would be a minimal effect on the local groundwater regime whilst effectively intercepting and treating the migrating contamination.
For over 15 years Envirotreat barrier systems have proved to be a highly cost effective and expedient method in which to deal with groundwater contamination problems and given each system is designed by Envirotreat specifically to deal with local contamination issues, then agreements with regulatory bodies can be tailored to suit almost all site requirements.
Validation of the SMRBS at Croydon will be undertaken through the installation of nine monitoring boreholes, these being located downstream, upstream and on the line of the barrier. Samples will be obtained from each borehole on a monthly basis for year one and bimonthly for year two.
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