Soil bioremediation and groundwater treatment at a domestic property in Devon
Client: Loss adjuster
Contract period: 26 weeks
The gardens of a large residential property suffered diesel contamination, as a result of a fuel leak from an adjacent property. The fuel migrated into a network of land drains beneath the site, and flowed down gradient, eventually surfacing at the base of the sloping garden, causing die-back of grass and other plants, as well as the presence of oil on standing water. The Client's environmental consultant recommended Telluric Land Remediation as a long established specialist bioremediation company.
It was initially proposed to excavate and remove all the affected soil off site and replace it with clean imported material. However, following a remediation options appraisal, Telluric Land Remediation proposed ex-situ bioremediation to remediate the contaminated soil, thus limiting off site disposals and greatly reducing costs.
Potentially contaminated land drains were excavated and replaced, contaminated soils being segregated for bioremediation. A treatment bed was constructed on the affected area for the treatment of contaminated soil. Nutrients and other amendments were added to the contaminated materials to create optimal conditions for bioremediation. The groundwater treatment plant, housed in the garage, was designed to trap oil and remove dissolved hydrocarbons.
- Excavation and replacement of land drains
- Excavation and bioremediation of contaminated soils
- Installation of free product and groundwater recovery sumps
- Installation of a mini groundwater treatment system
- Groundwater pump & treat – removal of free and dissolved phase hydrocarbons
- Reinstatement and landscaping
Following six weeks of treatment, concentrations of hydrocarbons in excavated soils were below the site specific remediation targets. Treated soils were re-instated, followed by landscaping of damaged areas. A significant cost saving was achieved compared to alternative remediation methods.
A pdf version of this domestic soil and groundwater remediation case study is available here.