PROJECT INFO

Client: Western Water

Project Design:  CMP Consulting Group

Contract Sum:  $1.1M

ABOUT THE PROJECT

Gisborne Recycled Water Plant Lagoon 1

Insufficient capacity is available at the Gisborne RWP to store high flows to the RWP that occur after high-rainfall events. The project works include for design and construction works to convert Maturation Lagoon 1 (MAT1) into a wet-weather retention basin, including installation of an impermeable liner and associated works. The project’s intention is to convert Lagoon 1 into an EPA compliant wet-weather retention basin, which would temporarily hold screened or unscreened raw sewage wet-weather sewage inflows, before returning the stored flows to the head of the plant for treatment.

WORKS

  • Earthworks to modify existing lagoon
  • Pipeworks and associated connections
  • Installation of underground pump station
  • Installation of above ground pump station
  • HDPE liner installation for the lagoon
  • Electrical and SCADA upgrades to existing infrastructure
  • Modifications to the existing outlet structure

KEY ASPECTS

  • Working in an operating treatment plant
  • Maintaining existing plant operability
  • Managing high rain fall events throughout the works

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