Remediation of Contaminated Land & Groundwater

Unlicensed Landfill Site

The Challenge

The Comber Consortium, a group of housing developers, have purchased land south of the village of Comber with the vision of building 900 houses. To the south of the site is an unlicensed landfill site which had been used to dump waste over a number of years.

ATG Group were contracted to carry out a 20-week remediation project on this 1.1 hectare piece of contaminated land in order for development to continue. Without remedial works the contamination posed a significant risk to the River Enler, which bounds the south of the area, and to future home owners and members of the general public. ATG Group undertook the submission of a working plan to the NIEA in order for planning to be approved for the proposed development.

The Solution

The solution presented by ATG was to install a vertical impermeable liner to a depth of 7m below the existing ground level and keyed into the natural clay layer. This would surround the area of contamination and prevent the material within the landfill from seeping into the river.

A second horizontal layer was placed on top of the waste and welded to the vertical barrier, resulting in the landfill being encapsulated and isolated from living receptors i.e. people and animals. Not only would this method contain the contaminants, but would also prevent any contaminates from seeping out.

The final stage of the project was to install a series of manhole inspection chambers around the landfill’s perimeter to allow any existing contaminated water to be pumped out and for the continual monitoring of gas levels. A perimeter road was created to allow a tanker to access the now sealed landfill and remove the waste water to a licensed treatment facility.

The Benefits

Benefit 1

Benefit 1

ATG Group have saved the Comber Consortium upwards of £10 Million.

Benefit 2

Benefit 2

ATG’s methodology prevented the hazardous waste from being taken to landfill and prevented any further contamination to the river.

Benefit 3

Benefit 3

Economic, social and environmental benefits resulting from our methodology, which succeeded in fulfilling NIEA objectives.

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