Remediation works of hydrocarbon contaminated soils by E-Clay stabilisation at Lisburn, Northern Ireland
Site Overview
The site approximately 640m² was previously occupied by a petrol filling station and vehicle service / repair garage, with associated underground fuel storage tanks. Prior to remediation works, these were decommissioned and removed from the site.
Site investigations had identified the presence of elevated concentrations of hydrocarbons in the soil, comprising both diesel and gasoline range organics.
Objective
The overall remediation strategy was designed to address source and indirectly pathway contamination issues, with the intention of protecting both human and groundwater receptors. The remedial operation involved the ex-situ treatment of the identified source contamination material by E-Clay stabilisation.
Post remediation it was anticipated that the site would be development for residual development.
Methodology
The excavated soils were treated ex-situ with E-Clay to chemical immobilise the mobile hydrocarbon pollutants.
The treatment operation was designed to fully recover the waste soils in order to produce a raw material suitable for use on site in accordance with predefined and agreed criteria.
Validation
Validation of the recovered soil was carried out by Envirotreat through leach testing of representative treated soil samples and comparison with agreed remediation target criteria.
A comprehensive Validation report was prepared on completion of the works.
