St Mary’s Bay and Masefield Beach Water Quality Improvement Project

ChanceryGreen regularly acts for clients – both applicants and submitters – on projects spanning the length and breadth of the country, but it is not every day that major projects are proposed in our own backyard. With the ChanceryGreen offices being located on Jervois Road (Ponsonby), Auckland Council’s proposed St Mary’s Bay and Masefield Beach Water Quality Improvement Project is just a stone’s throw away.

The proposal is for a new underground stormwater and sewage storage pipeline to address harbour water quality by collecting and storing overflows during heavy rainfall events. The application states that it will reduce the frequency of combined sewer/stormwater flows into the Waitematā Harbour from an average of 206 per year to 20 per year.

The proposal will be constructed via three shafts (at Point Erin Park; St Mary’s Road Park; and the corner of New and London Streets), and will include a large tunnelled section of pipeline, plus some open trenching. The proposal also includes the following permanent above-ground infrastructure:

  • Point Erin Park: a weir, pump station, odour control structures, and two air-transfer (ventilation stack) structures up to 10m high;
  • St Mary’s Road Park: a smaller weir, and odour control structures; and
  • New Street/London Street road reserve: up to four air transfer (ventilation stack)  structures (being 8-10m high).

Replacement and extension of the current marine outfall structure in the Harbour is also proposed.

Construction is estimated to take two years. While the proposal will have certain benefits, including for harbour water quality, it will also have a range of adverse effects, including on St Mary’s Bay residents. Potential adverse effects listed in the application documents include noise and vibration from construction (including tunnelling); odour from air exchange (ventilation stack) structures; visual/landscape effects from the above-ground infrastructure; geotechnical effects from tunnelling associated with the storage pipeline; traffic effects; and arboricultural effects associated with the pruning, relocation and removal of certain trees.

The resource consent applications for the proposal were publicly notified, with submissions closing in June 2018. Information regarding the application is available on the Council’s website here.

Note: ChanceryGreen currently acts for several clients in respect of the proposal.

Posted on June 18, 2018 .