Caton Road, Lancaster

Encapsulation of contaminated land

The background

Geobind was contracted to design and implement an in situ stabilised solution to replace the traditional capping and sub base layer works at a new drive-through restaurant in Lancaster to negate the need for cart and tip of non-hazardous soils containing asbestos.

The challenges

From initial ground investigation reports the material was classified as non-hazardous with traces of asbestos which would be a costly construction if a traditional construction was implemented.

Over an area of 2,500m² the design required a CBR strength of 30% and had to be non-frost susceptible.

To gain regulatory approval for stabilisation, Geobind undertook a suite of stabilisation trials (bench scale trials) to assess both the geotechnical and leachability performance to ensure that the optimal mix design satisfied the remedial objectives. The results where then validated within a verification report.

As the treated material volumes were less than 1,000m³, Geobind took advantage of the Environmental Agency’s ‘Enforcement Position’ and were able to obtain an exemption for the works which would mean that there was no requirement to deploy an Environmental Permit. However, Geobind was required to notify the Environment Agency of the duration, nature and control measures in place, and ensure that works were in line with best practise and legislation.

In conjunction with environmental consultants Pam Browne Associates, a remediation strategy and materials management plan were produced, submitted and agreed by the relevant local authorities prior to works commencing on site.

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