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Kaiapoi South Waste Water Pump Stations


Waimakariri District Council




May 2017 – October 2017 (26 weeks)


Construction of two wastewater pump stations and sewerage lines upgrades on Courtenay Downs subdivision, Kaiapoi, as part of the WDC Earthquake Infrastructure Rebuild.


  • Removal and disposal of existing asbestos containing roading backfill.
  • Laying of DN125 gravity mains by open cut trench excavation.
  • Laying of DN125 pressure main and tie-in to DN450 pressure main.
  • Temporary works consisting of cofferdams 8.4m x 4.4m with 8m deep FSPIII sheet piles with multi-usage well point dewatering to allow excavation to 6.5m deep.
  • Earthworks involving bulk excavation XXm3 and subsequent filling of XXm3
  • Structural concrete works for foundation slabs and tie beams.
  • Installation of DN1200 inlet manholes, DN1800 & DN2300 concrete wet wells, 2m x 2m valve chambers and 1.2m x 1.2m flow-meter chamber with all mechanical pipework & valving
  • Installation of the electrical control kiosk and all associated electrical works.
  • Drainage, AC paving and landscaping.