20191104_135558

 

Summary

CCGI were contracted by Bath and North East Somerset Council to undertake a ground investigation under the technical direction of the Engineer, Ove Arup and Partners Ltd, to assist with the redevelopment scheme at Bath Quays North.  The scheme comprised the redevelopment of an existing multi-storey council owned car park and adjacent bus/coach parking for multi-use office, retail, hotel and residential apartments in the centre of Bath.

Acting as Principal contractor, the main project challenge was to safely complete the scope of twenty boreholes (sunk to depths of up to 30m bgl), using three multi-purpose drilling rigs and a smaller dynamic sampling rig, all working simultaneously in busy car parks, whilst maintaining public access (pedestrian and vehicles).  Due to the proposed depths of the boreholes, our working methodology was undertaken in accordance The County of Avon Act 1982 to protect the historic hot springs and associated artesian groundwater and using clean drilling techniques to protect the principal aquifer.

Brief description of works

To best manage stakeholder expectations, we provided a detailed programme ahead of the works with rig information provided to the council to inform the management company running the public car park.  Lay down areas and traffic management plans were put forward to phase site works such that they caused minimum disruption to the public and loss of parking revenue.  Engineering logs (& AGS data) were provided to the Engineer (Arup) over the course of the three-week site works programme to allow the project management team to meet key milestones.  A draft factual report was presented to the Engineer with four weeks of completion of the main phase of site works (i.e. drilling activities), with the final report presented after six rounds of post fieldwork environmental monitoring (including low flow sampling.

Using two full time field engineers supervising the site activities, coordinated by a third supervising engineer maintaining liaison with the landowners, the Engineer and B&NES, avoided programme delay and ensured we were off site before the Christmas market arrived.

The works were carried out using in-house drilling rigs including our multi-purpose rigs, dynamic sampling rig. All works were supervised on a full-time basis by suitably qualified Engineering Geologists, with logging carried out to BS5930: 2015+A1:2020 and BS EN ISO 14688 [Parts 1 and 2] and BS EN ISO 14689:2017.

  • GPR service tracing
  • UXO clearance
  • Concrete Coring
  • 7 No Multipurpose combined dynamic sampling and rotary coring boreholes
  • Compliance with The County of Avon Act 1982 to protect the historic hot springs
  • Archaeological supervision
  • 20 Dynamic sampling boreholes including 3 in restricted headroom
  • 3 No inspection pits
  • 50mm combined gas and water monitoring standpipes
  • Insitu testing including SPTs, hand shear vanes and PID
  • Geotechnical and geoenvironmental laboratory testing
  • Long term monitoring
  • Factual reporting

For further details please follow the link: CS006 Bath Quays

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