Central Duffin Trunk Sewer

Scope of work completed:

  • 8no. shafts of 5.5m internal diameter and depths up to 15m installed in saturated sand and silt ground conditions.
  • Installation of 1850m of 1200mm sanitary sewer and 260m of 1350mm by Microtunnel with drive lengths ranging from 160m to 440m. 
  • Installation of 420m of 1200mm sanitary sewer and 150m of 1350mm by opencut.
  • Vortex drop structure installed in 5.5m internal diameter permanent shaft 15m deep.