McConnell Dowell is pleased to announce the award of the St Marys Bay and Masefield Beach Water Quality Improvement Project by Auckland Council’s Healthy Waters department.

This project continues to build on McConnell Dowell’s extensive experience constructing ocean outfalls. Our award-winning trenchless technology reduces the amount of trenching required in the landward section and disruption to nearby stakeholders.

It also minimises impacts for people travelling through the area – important considerations in confined residential environments and Auckland’s busy transport network.

The St Marys Bay and Masefield Beach Water Quality Improvement Project is one of the first and largest Water Quality Targeted Rate funded projects to get underway in Auckland and will reduce the number of overflows from an average of 100 a year to an average of 20.

McConnell Dowell Managing Director for New Zealand and the Pacific Islands, Fraser Wyllie says that “McConnell Dowell has considerable expertise in this area having constructed all of the largest marine outfalls in New Zealand. We are proud to be able to help improve water quality in our harbours and beaches and help provide a better life to communities. “

The work will involve:

  • Installing almost two kilometres of new pipeline
  • Only 25% will be installed using traditional dig and lay methods
  • Over 50% of the alignment will be tunnelled (1120m) using a brand new Herrneknecht TBM
  • And 1.8m ID reinforced concrete pipes will be jacked into place
  • The final 25% of pipeline will be constructed from HDPE and will form the outfall which will be joined in Kaiaua then towed to the city before it is lowered into place on the seabed in a controlled sink

Construction will commence in January 2020 and is scheduled to be completed by late 2021.