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Excavation and removal of contaminated soil from a domestic garden in Cornwall

Client: Developer
Location: Truro
Contract period: 4 weeks

Site investigations by an independent environmental consultant revealed a black ash and clinker layer containing elevated petroleum hydrocarbons and polyaromatic hydrocarbons beneath the garden of this domestic property. The garden was partially located within a tree root protection zone, requiring careful consideration during remediation.

Works involved segregation and stockpiling of clean and contaminated soils in order to minimise the volume of materials requiring treatment.  The affected area was partially located within a tree root protection zone, requiring careful consideration, and liaison with the local Tree Preservation Officer, during excavation and reinstatement.

Approximately 1200 tonnes of contaminated soil were transported to an off-site treatment facility, providing significant savings over disposal to landfill.

telluric bullet Our solution

  • Liaise with Tree Preservation Officer and mark out tree protection zones
  • Excavate topsoil outside area of tree protection zone and place in separate stockpile for chemical analysis to allow re-use, recovery and disposal options
  • Excavate contaminated soil outside area of tree protection zones and place in stockpile / quarantine area
  • In consultation with the Tree Preservation Officer, carefully excavate topsoil and contaminated soil around protected root zones
  • Reinstate root zones with imported clean material
  • Transport contaminated soil to off-site treatment hub site
  • Compilation of validation report

Our solution was very cost effective and allowed redevelopment of the garden area to take place safely and without delay.

A pdf version of this domestic site remediation can be downloaded here.