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In-situ soil bioremediation on a development site in Cardiff 

Client: Housing developer
Location: Cardiff
Contract period: 26 weeks

This brownfield site was contaminated with oil hydrocarbons over an area of 450 m2 as a result of previous industrial use. Specialist bioremediation contractor Telluric Land Remediation installed a bioventing system to address sub-surface contamination of soil and groundwater.  Bioventing is the process of aerating soils to stimulate in-situ biological activity and promote bioremediation. It is often the most cost-effective and efficient technology available for vadose zone remediation of hydrocarbon contaminated sites. 

The bioventing system comprised containerised, electrically operated, remediation equipment connected via trenched pipework to a grid of air injection boreholes.  The aim was to provide sufficient oxygen to allow naturally occuring microorganisms to degrade the oil hydrocarbons to low residual levels.

Remediation works were undertaken simultaneously with site re-development, thus avoiding delays in the building programme.  The bioremediation process was carefully monitored and optimised to ensure completion within the 26 week contract period, and to ensure it remained on budget. 

The site was successfully remediated to the requirements of the Environment Agency and sufficient to discharge the requirements of the Local Authority planning conditions for residential development.

 telluric bullet Our solution

  • Design of treatment system
  • Negotiations with Environment Agency and Local Authority
  • Installation of in-situ bioremediation system
  • Analysis and monitoring of pollutant removal from soil and groundwater
  • Validation and reporting
  • Environmental monitoring

 In-situ bioremediation provided our Client with a very cost effective solution, which allowed site redevelopment and remediation to take place simultaneously.

A pdf version of this housing development remediation case study is available here.