Remediation of Contaminated Land & Groundwater

Treatment Cell and Remediation

The Challenge

A century of shipbuilding and maintenance had left a legacy of ground contamination at this 9.3 hectare site.

Contamination was found to be located in many ‘hot-spots’ distributed across the site.

Contaminants included heavy metals, phyto-toxic metals and hydrocarbons including TPH and PAH’s.

The total volume of soil that required remediation was approximately 5,000 m3.

Off-site disposal proved too expensive and bioremediation would have limited impact on metal concentrations.

The Solution

Following a cost/benefit analysis, Dr McKinney proposed that an on-site containment cell represented the most practicable option.

Consultation was held with local regulators to agree in principle the suitability of an outline design.

A 4 metre deep containment cell fully lined with geo-synthetic/pre-hydrated bentonite membrane was constructed. Contaminated soil was placed in the cell and compacted in layers.

The Benefits

Benefit 1

Benefit 1

The client received the most economic and technically robust solution.

Benefit 2

Benefit 2

Movement and off-site disposal of contaminated soil was limited and the containment cell area could be utilised as a car parking area within the development.

Benefit 3

Benefit 3

Works could be undertaken during the initial earthworks phase of redevelopment, meaning that the programme was unaffected.

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