Tritech was the design-builder responsible for the design, construction, and commissioning of this Project.
Chilliwack WWTP Inlet Works and Emergency Repair Works to Primary Clarifiers
Project Description
2021
City of Chilliwack
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.
