The St Marys Bay Area Water Quality Improvement Project includes constructing a new stormwater storage pipeline that will reduce wastewater overflows to St Marys Bay and Masefield Beach by 95 per cent.
McConnell Dowell’s TBM Hinehōaka – named after the Māori deity of sandstone – is now positioned on a steel cradle to begin tunnelling this month after preparation activities were finalised.
Once tunnelling is complete, the TBM will have created a new 2 km long, 1.8 m diameter pipeline for the project, completed in three drives, to meet the increasing sewer system demand as Auckland’s population grows.
The pipeline will also significantly reduce combined wastewater and stormwater discharges to improve water quality and make local beaches safer for people and wildlife.
The project’s scope of works includes constructing three shafts; creating a tunnel to connect the shafts and a tunnel to the outfall location; assembling a 468 m long high-density polyethylene (HDPE) marine outfall; building a new pumping and screening station; and constructing a new weir structure and odour control unit.
The project commenced in January 2020 and construction is scheduled to be complete by mid-2021.
For more information visit the McConnell Dowell website.
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