North London Gasworks

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.