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Ex-situ soil bioremediation with groundwater pump & treat in Devon

Client: DIY Superstore
Location: Torquay
Contract period: 10 weeks

As a leading UK bioremediation contractor, Telluric Land Remediation was appointed to clean up this site of a former timber processing facility which was being redeveloped for a DIY superstore. Soils and groundwater were contaminated with fuel oil as a result of historical spillages. A treatment area was prepared and lined with an impermeable membrane to prevent cross contamination of the ground underneath.  Approximately 1,500m3 of contaminated soil was excavated, screened, crushed and placed in treatment beds.  

The treatment beds were rotovated regularly and then covered to provide protection from adverse weather and to reduce the risk of odours. Nutrient content, moisture and respiration rate were monitored weekly and the process optimised to ensure rapid soil remediation. Bioremediation was undertaken over a period of 10 weeks to reduce oil hydrocarbon concentrations to the required site specific target.

Hydrocarbon contaminated groundwater was pumped from the excavation and passed through a mobile treatment system consisting of settlement, filtration and activated carbon adsorption.  Treated water was discharged to the sewer under a temporary trade effluent discharge consent.

telluric bullet Our solution

  • Deployment of Environmental Permit EAWML30375
  • Excavation of soils and buried obstructions
  • Crushing and screening of materials to be retained on site
  • Construction of biological treatment beds
  • Ex-situ bioremediation of 1,500m3 contaminated soils
  • Soil and groundwater sampling and monitoring
  • Installation groundwater treatment plant
  • Off site disposal of redundant tanks, pipework and buried debris
  • Reinstatement of site with remediated soils

Our client benefited from a very cost effective, environmentally sustainable, solution which satisfied the Environment Agency and discharged local authority planning conditions relating to ground contamination, allowing the development to proceed without delay.

A pdf version of this ex-situ bioremediation case study is available here.