Remediation of Contaminated Land & Groundwater

Dynamic In-situ remediation at new £15 million ASDA Store, Strabane, Co. Tyrone

The Challenge

The site, which was to be redeveloped as a new ASDA superstore was located on the site of a former bus and rail station in Strabane and subsequently contamination associated with historic industrial uses was present on site.

This site had been in use for many years and the areas surrounding the main fuelling points had become saturated with fuel oils. Circa. 3500 tonnes of soils impacted with diesels and lube oil contamination required remediation to facilitate the site redevelopment.

The Contaminated Land Assessment concluded that the contamination within the soils was at such a level that there were potentially significant health risks to the public, to ground water and to the nearby River Foyle.

The consultant’s solution was the environmentally and commercially unsustainable ‘Dig and Dump’ approach.

The Solution

ATG Group designed a site specific remedial plan, providing a sustainable alternative solution to the traditional method of transporting contaminated material to landfill.

The remedial methods involved the excavation of the contaminated materials from the several areas on site. These materials were processed and treated with an enhanced Bio-Remedial solution created by ATG, to enable rapid ex-situ Bio-remediation – the remediation of all soils was achieved within the agreed 16 week period.

ATG discovered during the project, that the ground water had been contaminated with free product. The initial site investigation had not assessed the groundwater ,therefore this contamination was unexpected. However, ATG’s extensive experience ensured the development of a responsive solution. 12,500m³ of groundwater was pumped and treated over a 12 week period through a mobile, purpose built oil water separator facilitating oil recovery and water treatment – achieving zero visible oil discharge.

The Benefits

Benefit 1

Sign off

Following the successful completion of the project and sign off of works with the NIEA, the development was able to safely proceed, ensuring the client was compliant with all legislation.

Benefit 2

Savings

By employing this environmentally sustainable treatment process, the formerly contaminated material was reused on site, diverting 3500 tonnes of material from landfill and generating £350,000 savings on traditional landfill disposal.

Benefit 3

Peace of mind

ATG provided comprehensive management of all remedial aspects for the client and the project was completed within the agreed period. Unexpected groundwater issues were professionally controlled, providing peace of mind for the client.

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