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CASE STUDY: FORMER TANK FARM REMEDIATION

Home Page > Case Studies > CASE STUDY: FORMER TANK FARM REMEDIATION
CASE STUDY: FORMER TANK FARM REMEDIATION
Client: George Wimpey
Value: £2,600,000
Activities: Japanese knotweed, demolition, hydro-barrier, dual phase, pump and treat, bio-remediation, earthworks
Summary 
Remediation of contaminated soils and groundwater on a former tank farm and railway siding adjacent to River Thames in Purfleet, Essex. Gross hydrocarbon and chlorinated solvent contamination present in both soils and perched groundwater affecting the deeper chalk aquifer and prohibiting re-development for high density (up to 17 storeys) residential development.

Site Works 
  • Site clearance of heavily wooded 6.5 hectare site in close consultation with ecologists.
  • Excavation, treatment and disposal of Japanese knotweed infested soils and on-going treatment of boundary infestations.
  • Temporary diversion of public footpath and termination of large gas main.
  • Demolition of large sub-station.
  • Installation of hydraulically sealed sheet piled cut off wall to prevent cross boundary contamination.
  • Excavation of approximately 69000m3
     of soils including removal and re-processing of large buried obstructions.
  • Physical processing and segregation of soils prior to bio-remediation or re-use.
  • Ex-situ bio-remediation of approximately 44000m3
     from over 40,000mg/kg to less than 3000mg/kg TPH.
  • Removal of free phase product and removal, treatment and disposal of contaminated groundwater during earthworks.
  • Installation of a dual phase extraction system to remove free phase product and carry out vapour extraction from contaminated soils left in-situ directly behind sea wall.
  • Site re-profiling and re-instatement works.
     
Regulatory Consultation
This was a high profile project and necessitated close liaison and consultation with numerous third parties including the Environment Agency no less than three departments (Waste licensing, groundwater protection and sea defence), London Port Authority, local Environmental Health, neighbouring landowners and a comprehensive public consultation process.

Due to the volatile nature of some of the contamination, extensive personal and ambient environmental monitoring was required.

Sustainable Remediation
The project proved to be a model of sustainable remediation by generating soil conditioner from shredded trees/shrubs, treating a majority of soils on site, pre-treatment of soils to lower classification prior to export, recovery of 9000m3
 of secondary aggregate, recovery of 100’s of litres of free phase oil, several hundred tonnes of metal for recycling, and recovery through treatment of approximately 18000m3 of contaminated water.
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