Chilliwack WWTP Inlet Works and Emergency Repair Works to Primary Clarifiers

    • Wastewater Treatment
    • City of Chilliwack
    • December 01, 2021
    • Wastewater Treatment Plant

Tritech was the design-builder responsible for the design, construction, and commissioning of this Project.

Tritech’s scope of work for this project included:

  • Construction of a new Inlet Works Building to house the equipment required for fine screening, screenings washing/compacting, grit and septage separation and transfer pumping
  • Efficient and high-performance screening units with screenings processing
  • A high-performance induced vortex grit removal system with grit processing
  • Septage system
  • Pump station supply and installation
  • Construction of a pipeline to convey screened / de-gritted wastewater from the Inlet Works Facility to the existing primary clarifiers
  • Associated geotechnical, civil, structural, architectural, mechanical, electrical & instrumentation

    • Emergency Repair Works to Primary Clarifiers:

    During the upgrade works, a trough collapsed in Primary Tank #1 requiring an emergency repair (unrelated to Tritech’s work). The City retained Tritech to complete emergency repairs as follows:


    Phase 1 The Isolation Process:

    Prior to completing the proposed repair work, Tritech was required to obtain WCB approval for their method of isolating the discharge channel with an engineered bulkhead gate and sandbags.

    Phase 1 work included the following:

  • Obtain WCB approval for the proposed isolation method
  • Conduct sampling of the existing concrete to determine the extent of the concrete repairs
  • Demolition of the existing trough

    • Phase 2 The Concrete Repair:

    Phase 2 included the concrete repair, fabrication, and installation of the channels and troughs in primary tanks #1, #2 and #3.  To complete the proposed repair work, Tritech executed the WCB approved method as submitted on Phase 1.