Sugar House Island

The remedial design on this mixed heritage site was adapted as the works progressed, with full regulatory approval, to take into account the unexpected ground conditions relating to asbestos in soils. It is estimated that once treated in accordance with the agreed remedial strategy, these adaptions negated the need to remove 10,000m3 of impacted soils to landfill.

Due to the unexpected shortfall in concrete floor slabs and foundations, in addition to site specific engineering constraints, the design was also adapted to allow the stabilisation and re-use of geotechnically poor material in highways and infrastructure. It is estimated that by not needing to remove the geotechnically poor material from site and import aggregates to replace the shortfall, 2,159 tonnes of CO2 were saved.

In addition, 50,000m3 of material was treated using advanced bioremediation techniques for re-use in accordance with the agreed remedial strategy. It is estimated that we saved around 5,300 unnecessary lorry movements and 1,000 tonnes of CO2 using this application.

Want to know more? Download the case study here.

In-Situ Treatment on Ex-Industrial Site

This former mixed industrial site necessitated the use of treatment trials as part of the Options Appraisal stage, to determine the best technique to resolve a problematic contamination issues.

The significant NAPL and dissolved phase groundwater contamination was situated in an area located adjacent to a school, and it was essential that the remediation was completed without disruption or harm to the users.

In-situ methods of groundwater treatment were tested including the use of steam injection designed to enable viscous contamination to be removed. In-situ trials led to a modification of the approach which comprised additional investigation to target discrete but significant deposits of contamination.
By using this approach some 50,000 litres of product were removed successfully with full regulatory compliance and with no disruption to the users of the adjoining school.

Former Paper Mill, Devon

This former paper mill site has now been cleared of built structures, contaminated ground remediated, and the river reinstated to promote re-wilding and biodiversity. Works required the temporary diversion of the river, which enabled the culverted section of the river to be removed and the contaminated soils and groundwater removed for treatment.

Our sustainable and environmentally sensitive river design was achieved by an iterative process to meet the aims of landowners, as well as the Environment Agency, whilst being appealing to the public.

Key ecological species were protected as part of the works. The solution to restore and enhance the River Culm corridor has reversed the loss of biodiversity, making it possible for species to grow in numbers and increase in range. It has also provided a means of managing surface water as a contribution to the regions flood defences.

Our work alongside the wider stakeholder team led to a Brownfield Briefing award in 2017 for ‘best biodiversity enhancement’.

For more information please press here.

Interested in how we did it? Download the case study here.

In-Situ Remediation on an Operational Depot Site

Tasked with the remediation of residual diesel contamination on a refuelling platform at a large distribution centre, John F Hunt Remediation drew on the expertise of our in-house chemists and hydrogeologists to optimise a solution. By completing additional investigations and in-situ field testing, including injecting a fluorescein tracer to determine the permeability and hydrological conductivity of the ground, we refined the design of the in-situ chemical oxidation techniques and delivered the project efficiently and effectively, with no disruption to the client’s operations.

Interested in how we did it? Download the case study here.

Former Gasworks, North London

Remediation and Civil Engineering works were required on this ex-functioning change to legacy Gasworks.  The package provided by John F Hunt Remediation included the construction of a 10,000 sqm basement for underground parking, 530m of contiguous piling and the preparation of site infrastructure (including road, drainage, foul water pipework, attenuation tanks and telecommunications). Remediation was required to remove grossly contaminated and asbestos materials to provide a verified clean 800mm layer for future works.

In developing the Lump Sum Price and Programme, we reviewed site investigation reports and undertook independent investigations to inform the design and consider value engineering options. We devised a Materials Management Plan using forensic investigation to maximise the reuse of material and reduce the need for off-site disposal to local sites.

Interested in how we did it? Download the case study here


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