REC Completes Remediation for £19.5m Hayhurst Quay


Multi-disciplinary capabilities have helped REC complete remediation work for the £19.5 million Hayhurst Quay mixed-use development scheme, Northwich, to a tight deadline imposed by the project completion requirements.

The former site of Northwich Marina, Regal cinema and shoppers’ car parks is now set for the construction of a Waitrose supermarket, 58 residential apartments, 40-berth marina, waterside restaurant and public space.

REC completed design, management and validation of the remediation work including complex geotechnical engineering to re-engineer the sub-grade for infrastucture, ex-situ bio remediation, Japanese Knotweed eradication and flood mitigation construction, between December 2012 and end February 2013.

Due to the site’s riverside location, a flood tank will be built underneath the food store which will fill in the event of a flood and drain as the waters recede.

The extra care apartments, which will take shape after Waitrose has been built, will have a high floor level, drawn up with Environment Agency guidance and approval, and a dry access to the road in case of emergency. The buildings will also have 20m deep foundations to reach firm ground.

H2O, a national joint venture between the Canal and River Trust and private developer bloc, are behind the scheme, which is intended to rejuvenate the riverside location. REC was commissioned by H20 Urban to prepare a Phase II Intrusive Investigation and a Remediation and Enabling Works Strategy for the proposed redevelopment.

The scope of works consisted of a supplementary intrusive Ground Investigation including environmental monitoring, detailed laboratory analysis and Quantitative Contaminated Land Risk Assessment to assess the potential risk associated with contaminants within the underlying soil and groundwater.

REC was also commissioned to undertake the Remediation Strategy and Enabling Works, the purpose of which was to identify and evaluate feasible remedial technologies and define potential further investigative works prior to validating the successful implementation to ensure the safe, cost effective and regulatory compliant redevelopment of the site.

The purpose of the Remediation Strategy was to investigate, assess and carry out complete removal with validation of the identified hydrocarbon contamination from the area. In addition to the turn-over of all Made Ground across the site, REC carried out an investigation into suspected Peat Hotspots, Demolition of existing buildings, controlled removal of Asbestos Containing Materials (ACM) and re-engineering of the site to achieve the required geotechnical specification and correct levels. This was followed by the processing and placement of chemically and geo-technically suitable material back into the earthworks.

The REC team were exceptionally pleased to deliver such a complex project on time, on budget and with full regulatory approval.