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 A former mixed use industrial area developed to provide 112 new riverside houses and flats. The site required attention to three main contamination issues. These comprised of hotspots around the site close to ground level, contamination of materials being removed from an underground car park area and ground water contamination.
The principle contamination on this site was hydrocarbons and heavy metals. Hydrocarbons were treated through bioremediation thereby reducing total off site disposal and lowering the contamination for excess materials removed from site. Heavy metals were stabilised to reduce potential leachate problems. The outline Remediation Strategy was designed to maximise re-use on site and reduce off site contaminated disposal.
Initial instruction involved site investigation to determine the extent of the contamination and also the thickness of concrete slabs. Quantative risk assessment was then undertaken based on all information obtained. Clean up targets were devised and agreed with the Environmental Agency and a full remediation strategy developed. Hot spots were further tested and validated and subsequent voids backfilled. De-watering was then implemented for the underground car park construction. Soils from underground car park were excavated and treated in accordance with the strategy. Ground water treatment was also carried out to ensure EA agreement and sign off.
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