Site contamination 

Site investigation works have identified extensive contamination across the site, including asbestos, heavy metals and hazardous hydrocarbons (such as PAHs, naphthalene, TPH compounds and VOCs), largely arising from its historic use as a brickworks tip, subsequent fly-tipping, and shallow soil coverage. This has been further exacerbated by poor drainage in Longford Park. Elevated mercury has also been recorded in several locations, alongside contamination within groundwater, indicating that some migration is already occurring. As it stands, much of the land is not safe for public access. 

The proposed remediation will address these issues through the removal of contamination hotspots, specialist treatment and disposal of asbestos-impacted soils, installation of clean cover systems, and incorporation of gas and vapour protection measures within new buildings. Importantly, the existing clay cap is currently ineffective, allowing pollutant migration while restricting natural drainage. This will be replaced with an engineered capping layer, alongside groundworks that enable water to drain naturally and reduce further leaching. 

These works will properly contain contaminants, reduce long-term risks to human health and controlled waters, and make the site safe for public use. While this remediation comes at a significant cost to the developer, it delivers a substantial environmental and public safety benefit that would not otherwise be realised. 

Leaving the site untouched will not remove these risks. Access to the site means that the contamination could continue to spread, particularly through groundwater.