Squamish Wastewater Treatment Plant Upgrades

The District of Squamish is undertaking an extensive upgrade of the Mamquam Wastewater Treatment Plant. The WWTP upgrades consist of construction of a new circular bioreactor/clarifier tank, associated piping and a new septage receiving station. Ground under the proposed circular tank has been excavated to approx.1.5m below grade. Impacted utilities under the proposed circular footprint have been decommissioned and relocated.

    • Wastewater Treatment
    • Wastewater Treatment Plant
    • District of Squamish
    • April 01, 2025
    • Wastewater Treatment

The District of Squamish is undertaking an extensive upgrade of the Mamquam Wastewater Treatment Plant. The WWTP upgrades consist of construction of a new circular bioreactor/clarifier tank, associated piping and a new septage receiving station. Ground under the proposed circular tank has been excavated to approx.1.5m below grade. Impacted utilities under the proposed circular footprint have been decommissioned and relocated.

Challenges/Constraints

The work must be done in a manner that allows the treatment plant to continue operating and meeting the discharge permit throughout the duration of the work.

WWTP

  • Excavation and rough grading for new bioreactor clarifier.
  • Placement and compaction of granular materials and geotextiles
  • Concrete tank construction, including in tank piping and miscellaneous metal platforms, handrails, etc.
  • Supply and installation of process equipment.
  • Installation of clarifier mechanism and associated accessories pre-purchased by owner.
  • Construction of Flow splitter chamber for secondary treatment.
  • Modifications to rectangular clarifier to convert into Primary Clarifier.
  • Primary sludge conveyance pipe to DAFT.
  • Inlet piping from Grit tanks to proposed Primary Clarifier.
  • Conveyance piping from Primary Clarifier to Flow split chamber.
  • Conveyance piping from Flow split to two bioreactors.
  • Associated plant piping and tie-ins to existing piping, structures and equipment.
  • Power and control wiring and electrical kiosks.
  • Civil finish grading around designated work areas.

  • Septage Receiving Station

  • Rough excavation and site preparation
  • Placement and compaction of granular materials.
  • Underground buried piping and tie-ins.
  • Power and control conduits and wiring from new SRS building to existing Control Building.
  • Construction of new SRS building and all mechanical/electrical building equipment/components.
  • Installation of District supplied Septage Receiving Equipment.
  • Construction of new access road for septage trucks.
  • Fence modifications