The site in Kendal, Cumbria was formally utilised as a warehouse and timber treatment facility. Elevated concentrations of Tributyl Tin (TBT) had been identified and believed to be derived from the former timber treatment tanks. The site posed a major risk to the surrounding environment due to its close proximity to the River Kent and the elevated concentrations of TBT identified in groundwater across the site.
The site was being developed for a commercial end-use.
The overall remediation strategy proposed by Envirotreat was designed to address pathway between the source contamination and the identified receptors, namely the River Kent.
The remedial operation involved the installation of an E-Clay permeable Reactive Barrier. The barrier comprised of both passive (low permeability) and active (permeable reactive) sections. The objective was to treat contaminated groundwater as it migrates off-site towards the River Kent.
The groundwater simulation program MODFLOW was utilised in order to demonstrate that there would be a minimal effect on the groundwater regime whilst effectively intercepting and treating the contaminated groundwater.