North London Gasworks

Customer:National Grid Property Holdings

VHE completed the enabling project involving substantial ground remediation work in preparation for an extensive residential development.

The old Gasworks and Gasholders were situated in North London.

Works included:

  • Disposal of surplus soil stockpiles to landfill.
  • Excavation of seven areas where contamination was present from its previous use as a gasworks. Removal of water and redundant services.
  • Breaking out and crushing of hard materials for reuse or disposal off site.
  • Disposal of over, 25,000 tonnes of soils to treatment centers or landfills.
  • Importation of 3,100 tonnes of granular fill for backfilling.
  • Placement of a clay cut off wall either side of a culvert using 600 tonnes of imported clay.
  • Placement and removal of a temporary bridge over a culvert to allow heavy plant and vehicles to cross.
  • Dewatering of contaminated water from excavations, treatment and disposal to the sewer under a Discharge Consent.
  • Removal of contaminated water by road tanker to a treatment facility.
  • Excavations for a new gas main and Pressure Reduction Station including removal of redundant services.
  • Site investigation trial pits in other areas of the site.
  • Re-compaction of the soils to form an engineered development platform.

During the works value engineering was added to the project through VHE utilizing redundant gasholder 1 to store water until a Discharge Consent was obtained from Thames Water.

VHE successfully overcame other challenges such as the limited space to work on the west side and as access was on a severe bend in the road. Extra resources were needed to guide vehicles in and out.

VHE received a Performance Beyond Compliance certificate awarded under the rules of the Considerate Constructors Scheme.

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