Remediation works of former Pitwines Gas Works by E-Clay stabilisation.
Site Background & History
The site was formerly occupied by Pitwines Gas Works located in Poole next to Pool Harbour. Poole Harbour is classified as a Site of Special Scientific Interest (SSSI).
The developer had been granted planning consent for the construction of 500 residential units on the site.
The identified contamination on the site reflected the previous usage of the site as a gas works. The prime contaminants of concern were heavy metal pollutants, total petroleum hydrocarbons, polycyclic aromatic hydrocarbons, phenols, ammonia and ‘total’ cyanides (free and complex).
The remediation strategy for the site was designed to address the identified source contamination with the intention of protecting both human health and groundwater / surface water receptors.
The ex-situ remediation works involved the treatment of circa 11,000m³ of contaminated soils and gas works waste.
Representative samples were taken throughout the treatment process – these samples were combined to produce composite samples for validation purposes. Leachate results were compared to the agreed remediation target criteria.
On completion a comprehensive Validation Report was prepared.