Grey Lynn tunnel

We are building a new wastewater pipeline in Grey Lynn to reduce overflows and provide capacity in the network for future growth in the area. The tunnel will connect to the Orākei Main and local Grey Lynn sewer networks, taking wastewater to Māngere Wastewater Treatment Plant on a direct route via the Central Interceptor Tunnel.
Start-finish: Late 2022 – 2024
Location: Western Springs to Tawariki Street, Grey Lynn
Status: Planning

What’s happening?

The works at the Tawariki Street site will commence in 2023. The tunnel will be created by machine 15-60 metres underground from an existing site at Western Springs which will already be constructed for the Central Interceptor project.

A new construction site will be required at Tawariki site, where we will create a shaft to extract the machine once tunnelling is complete, and connect into local sewers which are at capacity when it rains. The main works at this site will be the shaft construction which is expected to take eight months to complete. The total construction will take approximately two and a half years to complete which will include, operational structures, removal of the tunnelling machine, closing the shaft and  commissioning the tunnel.

Resource consent applications for the proposal are due to be lodged with Auckland Council in early 2019. Decisions made regarding wastewater servicing are important, not just for the current communities but for future generations too. We have undertaken various technical and environmental assessments to inform the resource consent application and designation of the proposed tunnel and shaft site.

Construction is proposed to start at the Tawariki Street shaft site in 2023. Details of the works will be confirmed once consents are obtained and a contractor is engaged closer to the time of construction.

What are the benefits?

  • A reduction in diluted wastewater overflows in the Grey Lynn area, resulting in better water quality and surrounding environment

  • It will help cater for the growing Auckland population, now and for the next 100 years

  • To enable future connections and continued improvements to the wastewater system in the area

  • The tunnel will be constructed by tunnel boring machine underground to limit effects on residents along the pipeline route.

How will this work affect you?

  • Work hours at the shaft sites will be between 7am-6pm Monday to Friday, and 8am-6pm Saturday

  • At the Tawariki site, the works will involve up to 5 truck movements an hour during peak construction, specifically during the creation of the shaft

  • There will be some noise and traffic effects around construction sites, however we will ensure this is kept within Auckland Council consent requirements

  • Traffic management will be in place at the Tawariki site and on truck routes to minimise safety risks to road users. The works may at times affect street parking.

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Any questions?

Please contact:
Jennifer Charteris
Stakeholder advisor
Phone: 021979803

More information

Grey Lynn Tunnel wastewater upgrades flyer (February 2018)