Ghella Abergeldie Joint Venture and Watercare have formerly signed the contract to construct Auckland’s Central Interceptor, a $1.2bn wastewater tunnel with associated infrastructure.
The largest wastewater project in New Zealand, the 4.5m diameter tunnel will stretch over 13km from Western Springs to the Māngere Wastewater Treatment Plant, collecting wastewater along the way via sewers and drop shafts. The Grey Lynn Tunnel, a 2km long extension has also been awarded to the JV as part of the construction contract. Mobilisation will start in May 2019 and the whole project is expected to be completed by 2025.
The project will greatly benefit Auckland and the community by providing additional wastewater capacity to accommodate the growing city and help reduce the volume of wastewater overflows, so that everyone can enjoy clean waterways, beaches and estuaries.