Central Interceptor
The Central Interceptor is a major wastewater infrastructure project in Auckland, designed to collect and transport wastewater from central and western parts of the city to the Wastewater Treatment Plant in Māngere.
The project is being delivered across 17 construction sites along the 16.2km tunnel route, with the deepest section reaching 110 metres below the surface. The tunnel also includes links to sewers, drop shafts, flow control structures, grit traps, air vents and a pump station to manage wastewater efficiently.
Client
Ghella Abergeldie Joint Venture
LOCATION
Auckland, New Zealand
COMPLETED
In Progress
Awards
Infrastructure Sustainability Council (ISC) - Leading (‘Excellent’) Design Rating for Sustainability
Our Scope
Marshall Day Acoustics has been involved in the project since 2011, engaged by Watercare to assess both construction and operational noise effects. Our work includes ambient noise monitoring, computer-based noise modelling, preparation of noise impact assessments, input into the development of resource consent and designation conditions, and the presentation of expert evidence at hearings.
Throughout construction, the MDA team works closely with Ghella Abergeldie Joint Venture to predict and assess noise and vibration impacts, prepare Construction Noise and Vibration Management Plans and Activity-Specific Noise Management Plans, support neighbour consultation, conduct ongoing monitoring, and train the Environmental team in noise and vibration monitoring techniques.
CHALLENGES
Managing construction noise and vibration across 17 active sites in established residential neighbourhoods was a significant challenge. With the tunnel boring machine operating around the clock and shaft construction, piling, and open trenching generating substantial noise, predictions indicated levels exceeding 80 dB LAeq at nearby multi-storey buildings. Marshall Day worked closely with the construction team to develop site-specific noise management plans, implement monitoring programmes, and support neighbour consultation throughout the project.
PROJECT TEAM
RELATED PROJECTS
