CASE STUDY

Large wastewater project closer to start date

Construction of the Central Interceptor moved significantly closer to its start date this year with the announcement of the contractor short-list in May.

Four short-listed construction contractors were given until 14 September 2018 to prepare their proposals – the winning bid is to be announced in February 2019.

Short-listed contractors are: CPB Contractors, Ghella-Abergeldie Harker Joint Venture, Pacific Networks, comprising McConnell Dowell, Fletcher Construction and Obayashi; and VINCI Joint Venture, comprising VINCI Construction Grands Projets, HEB Construction and Solentache Bachy.

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“We’ve had a positive start to this project. Keeping to schedule on this critical project is crucial for the industry. There is much at stake – these contractors and all interested parties need certainty and confidence in the process and timeframe.”

The Central Interceptor – a 4.5-metre diameter wastewater tunnel – is a critical legacy project that will deliver far-reaching benefits for the people of Auckland. As a long-term fix for recurring wastewater overflows into the Waitematä Harbour, this extensive wastewater project will reduce wet-weather overflow volumes by up to 80 per cent. At the same time, the tunnel will provide storage and transmission capacity to accommodate the city’s fast-growing population.

Lying at depths of between 22 and 110 metres below the ground’s surface, the tunnel and link sewers will be supported by 17 shafts along the route. The shafts collect and transfer wastewater into the tunnel, and at the end of the tunnel, a major pump station will direct all flows into the Mängere Wastewater Treatment Plant.

With construction set to start in 2019, the $1.2 billion Central Interceptor is one of New Zealand’s most ambitious tunnelling projects.

Shayne Cunis, executive programme director for the Central Interceptor, is pleased with the disciplined procurement approach.

“We’ve had a positive start to this project. Keeping to schedule on this critical project is crucial for the industry. There is much at stake – these contractors and all interested parties need certainty and confidence in the process and timeframe,” says Shayne.

“Our intention has always been to stick to our plan. We do what we say and the people of Auckland can take comfort that Watercare is delivering on its promises of improving Auckland’s infrastructure.”

Project completion is scheduled for 2025.

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