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Customer: National Grid
Value: £2.6 million
The former Huddersfield Gas Manufacturing Works covered an area of 3.2ha and was decommissioned in 1972. VHE undertook its remediation as part of the framework agreement with National Grid Property.
The works were carried out over a rolling 42 week phased programme of enabling/demolition, site investigation, design and implementation of on-site bioremediation and disposal of segregated wastes. Site investigations had identified contamination to soils and groundwater by gas production by-products including poly-aromatic hydrocarbons (PAHs) ammonia, spent iron oxide, aliphatic and aromatic hydrocarbons, and toxic metals.
Following initial dewatering, careful segregation excavation of over 60,000m³ of material was carried out, including 11,000m³ of tar impacted soils. This was sentenced for further bio-physical treatment, including moisture modification by controlled addition of lime, screening and bio-remediation of material with suitable characteristics. Segregation works included sample screening every 200m³ of excavated material for asbestos. Any asbestos containing materials were subsequently classified and treated or disposed of following quantitative assessment.