A geotechnical Site Investigation was undertaken, utilising machine excavated trial pits and shear vane testing, to look at the shear strength of the cohesive deposits at foundation level. The shear vanes provided real time in-situ strength assessment for the supervising Engineer. This revealed the shear strength of the clays at existing founding depth to be suitable for the proposed loading of the refurbishment.

A detailed Radon risk assessment revealed that the Kellaways Clay Member geology had a reduced Radon risk. The assessment showed that eastern and northern area of the site has a maximum radon potential of 5 – 10% with the remainder reduced to 1 – 3%. Given the proposed buildings were located where the reduced risk was highlighted, it was agreed that in-building radon monitoring was required. Monitors were hung on a screw drilled into the wall at head height within all of the locations on-site. All of the windows and doors were sealed on-site using a damp proof membrane, expanding foam and battens to locally isolate rooms.

 

 

Based on the anticipated occupancy level for the building the Radon action level or target levels were not exceeded, and the risk assessment concluded no Radon protection measures were required to be installed as part of the refurbishment.

 

 

 

Ground & Water’s quick, cost effective, site specific and detailed contaminated land and geotechnical investigations saved the client money and helped with the construction programme.

No piling was required, thanks to the ability to re-use the existing foundations.

No additional radon protection measures were needed, based on a detailed Radon Risk Assessment with onsite monitoring.