The oil tank and boiler were relocated for the duration of the works and a temporary heating system installed. This work was conducted by a suitably qualified OFTEC registered heating engineer.

A section of the concrete boundary wall running from the rear of the kitchen extension to the oil tank and a separate brick wall in the rear yard were removed and disposed of.

A section of the rear lawn extending from the brick wall to the oil tank was excavated to an appropriate depth.

Two groundwater recovery wells were installed. These wells were necessary to remediate the hydrocarbon contamination located within the fill material at the rear of the property.

One additional groundwater recovery well was installed within the rear lawn to limit the migration of any contamination that could have flowed down towards the centre of the garden from the spill source.

Inoculation lances were installed to facilitate the injection of oil degrading solutions directly into the substrate.

The impacted area was subjected to intensive treatments for the soil, exterior and interior of pipes, impacted foundations and rising walls. A treatment system was installed to cover the entire area of impact and treatment residues captured within the recovery sumps and filtered.

The treatment involved the direct injection of oil degrading solutions directly into the substrate. The system allowed for timed and controlled injections of treatment solutions within the area of damage.