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The oil had not remained in one contained patch. It extended along the road and into a car park within the business centre, increasing the area that needed to be treated and making access management an important part of the response.
Because the site was occupied, the remediation also had to work around normal business activity. The objective was to progress the clean-up without unnecessarily preventing the surrounding units from continuing to trade.
The first scope allowed for one team and one attendance. Once work progressed on the ground, the scale of the contamination required additional resource, and the response was expanded to two teams and further attendance.
Four technicians ultimately worked across the two-day programme. That ability to increase the resource mattered because the affected area crossed active external spaces rather than a single isolated surface.
The remediation method centred on oil bioremediation. A digestive enzyme treatment was applied to the affected oil and mechanically agitated across the contaminated surfaces, allowing the treatment to act on the hydrocarbons rather than relying on water alone to move residue from one place to another.
Two Dirt Driver surface-cleaning machines supported the treatment across the hardstanding. Waste generated during the work was collected and contained, with an IBC used as part of the site waste-management arrangements.
The remediation was completed over two days and the business park remained in use throughout the response. The treated areas were returned to a safe and acceptable condition so normal site activity could continue.
Some heavy staining remained visible on the tarmac after treatment. This had been anticipated: because tarmac is itself an oil-based material, complete visual stain removal is not always achievable immediately. The on-site assessment noted that the remaining staining would become less prominent over time as the surface warmed and weathered.
