111 Street Water Services Infrastructure Upgrades
- Location Edmonton, Alberta
- Description
GS Construction successfully delivered four watermain construction projects along 111 Street in Edmonton on behalf of EPCOR Water Services. The work was completed in close proximity to Blackmud Creek, an environmentally sensitive area, and within a heavily trafficked urban corridor. Despite challenging winter conditions, complex utility coordination, and stringent traffic requirements, all projects were executed safely and efficiently with minimal impact to the public and surrounding environment.
Hydrovac Investigation
The program began with a Hydrovac Investigation to locate existing utilities and support project planning and design. Work was carried out during off-peak hours, with traffic accommodation measures in place to maintain safe and continuous flow along 111 Street.
- Completed between February and March 2024
- 52 core holes drilled, with utilities exposed at each location
- Traffic accommodation plans implemented during off-peak hours to maintain traffic flow along 111 Street
Mainline Watermain Installation
The Mainline Watermain Installation phase, completed between October 2024 and March 2025, included the installation of new watermain, valve chambers, and trenchless crossings along 111 Street. Work was carried out under winter conditions, with traffic maintained at all times and temporary water service provided to local businesses.
- Completed between October 2024 and March 2025
- Installed nearly 500m of 600mm Watermain
- Installed nearly 200m of 150–450mm Watermain
- Installed 3 Valve Chambers
- Completed 2 trenchless Auger crossings under 111 Street at 9 Avenue and 12 Avenue
- Tied into existing 600mm CCP (North) and new 600mm PVC (South)
- Supplied temporary water service to businesses
- Maintained traffic on 111 Street through staged lane shifts at 9 Avenue and 12 Avenue
- Completed majority of work in cold, snowy conditions
Concrete Protection Slab
The Concrete Protection Slab work, completed between January and April 2025, involved environmentally sensitive construction adjacent to Blackmud Creek. A slide rail shoring system was installed to support excavation and construction of a concrete protection pad over an existing transmission watermain. Additional earthworks and structural support measures were implemented to safely carry out work along the creek slope, while maintaining traffic and temporary water service.
- Completed between January and April 2025
- Environmentally sensitive work near Blackmud Creek
- Installed a 5m deep slide rail shoring system
- Constructed a 28m long and 2.8m wide concrete protection pad over the existing Transmission Watermain
- Completed extensive earthworks, including a custom I-Beam Lagging wall to support equipment along the creek slope
- Supplied Temporary Water service to one residence and one business
- Maintained two-way traffic on 111 Street at all times
Blackmud CCP Lowering
The Blackmud CCP Lowering, completed between November 2025 and March 2026, involved lowering an existing 600mm CCP watermain near Blackmud Creek. The scope included installation of new watermain, casing, valves, and related components, while maintaining environmental protections, temporary water service, and continuous traffic flow.
- Completed between November 2025 and March 2026, anticipated
- Environmentally sensitive work near Blackmud Creek
- Installed 130m of 600mm watermain
- Demolition and removal of 1 Valve Chamber
- Installed one 600mm Gate Valve with two MAVs
- Installed 600mm Vertical bends to allow the large elevation deflections
- Installed 26m of 900mm Casing
- Installed one Flushmount Hydrant
- Tied into existing 600mm CCP (North) and existing 600mm steel (South)
- Supplied temporary water service to a residence and one business by injecting from above ground
- Maintained two-way traffic on 111 Street at all times
- Owner EPCOR Water Services
