South Western Interceptor Extension
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Client: Watercare Services Ltd
Sector: Infrastructure
Location: Auckland
Contract Value: $24 million
Completed: Apr 2013
Main Contractor: Fletcher Construction

The South Western Interceptor Extension project involved the construction of a new pump station and the extension of the existing South Western Interceptor to the suburb of Manurewa.

The project is required to provide for residential growth in the Manukau area. The works duplicate existing assets that are at risk of failure due to age and condition and reduce the frequency and volume of wastewater overflows to the Manukau Harbour.

The large diameter wastewater pipe was installed in challenging ground conditions, along residential streets using three different methodologies: open trenching(2,200m), directional drilling (2,300), and pipe jacking (1,800m). For the sections of pipe jacking we employed a tunnel boring machine.

Construction of the pump station pit comprised insitu reinforced concrete wet- and dry-well internal walls and precast panel roof.  Secant piling was used for the temporary shafts for the micro-tunnelling works and a large amount of insitu and precast concrete chambers were installed throughout the contract.

BPC were responsible for all mechanical installation on the project including 4 No. 320Kw pumps, numerous 700-900 dia valves, pipework, HVAC system, cooling water system and odour removal. We were responsible for managing the sub contract electrical works which included installation of a new control system, cabling, new switchboard and float switches.

Work Completed in Feb 2012

  • Brian Perry Civil completed the contract 6 weeks ahead of programme despite encountering tricky ground conditions.
  • We received positive feedback from Watercare Services Limited and no complaints from stakeholders during the construction of the contract.
  • The contract was carried out adjacent a live operational site and as such strict health and safety guidelines were adhered to throughout construction.