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Bellozanne Hillside Removal

Project Details

In preparation for the construction of the new Sewage Treatment Works at Bellozanne, it was necessary to enlarge the site to provide adequate space for a new works before the old works could be decommissioned.

The Department for Infrastructure awarded Brenwal the design and build contract to excavate some 60,000m3 of rock from the valley sides of the site, to stabilise the slopes and prepare the site for the future development.

The project included the following key elements.

  • The installation of 10,000 rock bolts and ground anchors between 9m and 15m in length.
  • 300m of storm sewer diversion between 300mm and 450mm diameter.
  • 150m of foul sewer diversion.
  • 1000m of slope drainage works.
  • 450m of toe drainage channel.
  • 25m of 3m high retaining walls.

This £5m project was completed during 2017 on time and to budget.