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 Former site buildings were constructed on hardstandings over tipped materials including colliery spoil, refractory waste and limestone rubble. The redevelopment included areas for commercial and industrial use, access roads and parking.
The principle contamination on the site was hydrocarbons, volatile and semi-volatile organic compounds. There was also evidence of some heavy metals including barium, lead and copper and also asbestos containing materials. Also a number of contamination hotspot areas including above ground storage tanks, a pitch impregnation plant area, chemical storage areas in addition to localised areas which have been tipped with miscellaneous wastes and asbestos materials.
Hydrocarbons were treated through bioremediation which lowered the contamination prior to replacement as engineered backfill. The heavy metals were stabilised to reduce leachate problems. Deeper hydrocarbon contamination within the limestone aquifier below the cut levels were exposed and treated in-situ with a chemical reagent
A water treatment system was designed to accommodate the nature of the groundwater encountered. An oil/water separator was required as free product was present and also an associated baffle tank to remove particulates. Additionally, a carbon filter was installed to remove dissolved hydrocarbons.
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