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Brough retaining wall timescales for the repairs

All timings are approximate depending on site issues discovered as the works progress, weather conditions and the availability of materials.

The timings have been changed following the county council's decision to work on-site 7 days a week, at the request of local people, at the community drop-in event in June.

Week 1

  • install diversion signs
  • install site welfare cabins and safety fencing
  • set up storage and handling area for materials
  • radar survey of the ground to check the location of any underground utility cables and pipes beneath the road
  • dig trial holes by hand to check the precise location and condition of any underground pipes and cables
  • staff briefings about the works, safety and ecological issues
  • install temporary diversion for the brook, to push water away from the building site
  • once brook diverted, drain water and ecologist to carefully remove any fish, if required
  • take down the existing bridge parapet wall, level with the surface of the road and store stonework off-site

Week 2

  • 8.5 tonne excavator to remove existing road surface
  • removal of 23 metres (width) of the upper stone courses of the retaining wall by hand

Week 3

  • working from the road, removal of the middle and lower courses of up to 23 metres (width) of the damaged section of the retaining wall
  • removed stone to be cleaned by hand and stored off site

Weeks 4 to 5

  • assessment of the existing foundations of the retaining wall that will be used to build the new retaining wall
  • dig out the new foundations for the concrete wall, hidden behind the face of stone wall
  • pour concrete footings for the new retaining wall – note this will not be done if there are any flood alerts in place for the Bradwell Brook

Weeks 6 to 7

  • install a mould and pour concrete that will form the backing of the new retaining wall, up to approximately 1 metre
  • reuse the stone removed from the site to 'face' the concrete to restore to how the wall looked before the collapse

Weeks 8 to 11

  • repeat the process described in weeks 6 and 7, to rebuild the middle and upper portions of the wall, until it is level with the road surface
  • rebuild the road surface removed by the excavations
  • rebuild the parapet above the road surface, to provide a safety barrier for vehicles

Week 12

  • removal of the scaffolding
  • removal of the temporary diversion for the brook
  • remove the excavator and other site equipment
  • remove the site cabins and safety fencing
  • remove the traffic diversion signs