Remediation of Contaminated Land & Groundwater

Emergency response and remediation of soils and groundwater at a Coleraine School

The Challenge

Over 1000 x 20kg bags of cat litter contaminated with diesel had been illegally dumped and buried at the above site – this had been discovered during term time and with hundreds of children in attendance at the school, emergency response to protect human health, as well as the natural environmental was imperative.

ATG Group’s investigation highlighted that over 400m² of soils and groundwater were impacted with hydrocarbon contamination.

Due to the location of the discovered contaminative materials, a river running through the property, in close proximity to this point had become impacted with the degraded diesel – this urgently needed containment to prevent the contamination migrating off site and to protect the client from prosecution by the NIEA.

The Solution

ATG Group designed a site specific remedial plan, providing a comprehensive and multifaceted approach to decontamination, to expedite the overall remedial process.

Undertaking this process rapidly was an imperative consideration, as our aim was to prevent potential damage to localised receptors, including the groundwater, flora and fauna, as well as aquatic life, Furthermore as the river is a tributary of the River Bann and extends approximately 2 miles before the point of confluence – any contaminative damage throughout this stretch could negatively impact upon the natural environment and cause possible risks to human health, particularly in the school grounds and within a popular public park close by.

The remedial methods involved the containment of free product in the river through the use of absorbents designed for oil based contamination and via the installation of a groundwater circulatory system ,designed to process groundwater impacted with hydrocarbon material through a 3 stage filtration process. Where possible soil materials were processed and treated with enhanced ATG Bio-Remedial solution to enable rapid ex-situ Bioremediation and the excavation and disposal of only the most heavily contaminated materials on site was undertaken.

The Benefits

Benefit 1

Signed off by the NIEA

ATG were delighted that the successful completion of the project facilitated the sign off of works by the NIEA, this ensured the client was compliant with all legislation and no risk to human or environmental health was present.

Benefit 2

Formerly contaminated material was retained

The remedial methods employed promoted a highly sustainable treatment process, as the majority of the formerly contaminated material was retained on site, diverting 1000 tonnes of material from landfill and generating £85,000.00 savings on traditional landfill disposal.

Benefit 3

Comprehensive management

ATG provided comprehensive management of all remedial aspects and the project was completed with assurances for the client through final testing and validation that all works were carried out to the highest industry standards.

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