QM Environmental was awarded the RFP 33.6 Subcontract as part of the Portlands Flood Protection and Enabling Infrastructure project in Toronto.
The scope of work involved:
- Demolition of a historic dockwall
- Dry and wet excavation, including dredging
- Management and tracking of excavated material
- Underwater placement of marine geotextile
- Underwater placement of a subaqueous barrier layer comprised of granular activated carbon
- Placement of river finishes
QM Environmental conducted this work using conventional and long-reach excavators from land and a floating barge section. All work was undertaken in a turbidity curtain to prevent turbidity from entering the Toronto harbour.
QM Environmental Services:
- Dry excavation of over 3000 m3 of material
- Wet excavation/dredging of over 13,000 m3 of material
- Demolition of over 65m of dockwall
- Placement of approximately 3300m2 of marine geotextile underwater
- Placement of 3300m2 of a subaqueous barrier layer (granular activated carbon)
- Placement of over 2000MT of river finishes, including rip-rap, armour stone and habitat boulders
- State-of-the-art survey using grade control and bathymetric survey techniques to document underwater conditions
- State-of-the-art soil tracking and data management using proprietary software
- Removal of historical, unknown underwater structures such as timber piles, walers, etc.
- Monitoring of dockwall for vibration during periods of active construction work.