Redevelopment of a Former Yard, Marshland St James, Norfolk
Case Study Reference: 15-11-09
Planning Authority: Borough Council of King's Lynn & West Norfolk
Due to the sensitivity of the proposed development and the history of the site a contaminated land planning condition was attached to the decision notice.
Demeter Environmental was commissioned to prepare a desk study report for the site, which identified a number of potentially contaminative land uses, namely made ground and former farm buildings on the site and off site sources of ground gases.
The qualitative risk assessment discounted all but the made ground on the site as credible sources of contamination, hence a Phase II Investigation was proposed to investigate the extent of the made ground on the site and to determine if the made ground was impacted by elevated levels of contamination.
The Phase II investigation comprised of the excavation of a number of trial pits across the site, which identified made ground across the majority of the site. The chemical analysis indicated that the made ground was impacted by elevated levels of PAH’s and copper, and the placement of a 600mm cover on garden / landscaped areas was proposed.
Prior to the development of the site a Phase II Implementation plan was required in order to ensure the methodology of the remediation was understood and approved by the local authority which was formally submitted to the local authority under the updated application (16/00514/F). Once the plan was approved the development commenced.
The remediation was inspected during the development and on completion of the remediation a completion report was issued demonstrating all the remediation had been undertaken. The completion report was accepted by the local authority and the contaminated land planning condition was discharged.