Remediation of Contaminated Land & Groundwater
Treatment Cell and Remediation
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.
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 client received the most economic and technically robust solution.
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.
Works could be undertaken during the initial earthworks phase of redevelopment, meaning that the programme was unaffected.