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Groundwater remediation using in-situ chemical oxidation on a housing development in Cheshire

Client: Developer
Location: Glazebury
Contract period: 12 weeks

Groundwater remediation contractor Telluric Land Remediation was appointed by a local housing developer to undertake remediation of contaminated land at the site of a former petrol station in Glazebury, Cheshire.

Quantitative risk assessment by the Client’s environmental consultant concluded that remediation would be required to reduce the potential environmental impact of hydrocarbon contaminated groundwater.  Benzene was selected as a marker compound and a remedial target was derived using the Environment Agency Remedial Targets Worksheet.

Petroleum hydrocarbon contaminated groundwater was treated by in-situ chemical oxidation. Due to the presence of low permeability ground conditions, infiltration rate of chemical oxidant was enhanced by temporarily dewatering the remediation area in a phased abstraction using the installed injection points.  Recovered groundwater was pumped to temporarily storage tanks prior to off-site disposal.

Site remediation was undertaken concurrently with house construction and was completed to the requirements of Local Authority Planning and the Environment Agency after 12 weeks.

 telluric bullet Our solution

  • Design of remediation system
  • Installation of groundwater monitoring boreholes
  • Dewatering the remediation area to enhance distribution of the injected chemical oxidant
  • Off-site disposal of abstracted groundwater
  • Treatment of groundwater and smeared contamination by in-situ chemical oxidation
  • Progress reports and issue of final validation report to the Regulators

Our solution was very cost effective and allowed construction activities to be undertaken concurrently and safely.

A pdf version of this housing development remediation can be downloaded here.