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Customer: National Grid
Value: £6.5 million
Remediation of the site involved the excavation, on-site treatment and disposal of segregated wastes, excavation of over 110,000m³ of material.
The former Clough Road Gas Works in Hull covered an area of 17ha located only 20 metres from the River Hull. Site investigations had identified contamination to soils and groundwater by gas production by-products including tar, poly-aromatic hydrocarbons (PAHs), ammonia, spent oxide, phenol, cyanide, TPH and heavy metals.
A total of 55,000m³ of contaminated material was selected for treatment by bioremediation. 20,000m³ of which was undertaken by VHE and 33,000m³ using enhanced bioremediation processes. In order to control the environment for the soil stockpiles in the enhanced bioremediation process, the initial phase of processing was carried out within a large tent structure. Using the enhanced bioremediation, combined with careful materials management and stabilization techniques, the project achieved more than 75 per cent materials recovery for soil that would previously have ended up as hazardous waste in a landfill.