New Superstore Development Low Stanners, Morpeth

DBS Environmental Phase 2 Ground Investigations

New Superstore Development for Dransfield Properties Limited at Low Stanners, Morpeth

DBS was involved in the appraisal and remediation of a brownfield site prior to the construction of a superstore.

  • Client:Dransfield Properties Limited
  • Date: March 28, 2015

Summary

DBS was involved in the appraisal and remediation of a brownfield site known as Low Stanners in Morpeth, Northumberland on behalf of Dransfield Properties Limited (Dransfield) and Tolent Construction Limited (Tolent).

The site had a varied historical use and various parts of the site had been in use as an abattoir, allotment gardens, corn mill, car park, electricity substation, repair garage, public house, veterinary practice and a highways depot for Northumberland County Council.  The latter included fuel storage with above and below ground tanks.

The majority of the site had been in use as the council depot in recent years until site closure. Dransfield identified the site for development
as a new retail superstore, and work commenced in late 2011 to clear existing above ground structures. Thompsons of Prudhoe were appointed by Tolent to undertake demolition and site clearance, and they were subsequently appointed to undertake site remediation. Tolent were the ‘Principal Contractor’ in accordance with the Construction (Design and Management) Regulations 2007.

DBS were employed to undertake a phased risk assessment of the site in order to identify any contamination constraints associated with site redevelopment as a result of its former use. The risk assessment work built on previous work undertaken for the site by MET Consulting Engineers (Met) to develop the sites Conceptual Model. Met were the appointed civil engineering consultant to take forward the construction of the superstore.

The scope of DBS’ initial characterisation work was undertaken in full compliance with the requirements of Planning Policy Statement (PPS) 23; Annex 2 – Development on Land Affected by Contamination, and remediation verification was undertaken in compliance with the new National Planning Policy Framework (NPPF) which came into force in March 2012 as a replacement to PPS23.

Site appraisal commenced with a Phase 1B Desk Study in order to fully understand the site history, confirm its regulatory status and to establish an initial Conceptual Model.

As part of the desk study process existing intrusive information and site chemistry data available for the site was re-interpreted and the data was split up into five distinct data sets representing former land use.

This allowed for the development of a robust Conceptual Model which identified data gaps to be filled by additional investigation, this enabled a highly targeted investigation to be scoped which saved time and resources in the site characterisation phase. The additional investigation work was designed to obtain controlled waters data to aid further risk assessment work. The work was also designed to install long term groundwater and gas monitoring wells at the site boundaries that would also function as compliance wells during site remediation.

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