100 Avenue trunk sewer repair
- Hand tunnel excavation and pipe installation on 100 Avenue bypass tunnel is complete. Crew are working in the 12ft shaft on 100 Avenue to complete the manhole structure to the ground surface
- Rehabilitation of the existing 1950mm sewer will begin once the flow is diverted to the new bypass tunnel
- Current odour mitigation measures include using the air scrubber at 153 Street as well as covering the shaft when not in use by workers
Concrete trucks will temporarily block the pedestrian crosswalk at 100 Avenue as the 12ft shaft is backfilled. Crew on site will be able to assist and guide pedestrians around the trucks as necessary. 100 Avenue will remain accessible to vehicular traffic.
This work is expected to last for about 2 to 3 hours at a time on Tuesday August 8 and Wednesday August 9.
New bypass tunnel on 151 street between 99 avenue and 100 avenue
Approximately 10m of pipe remains to be installed from the tee connection at 99 Avenue back to the intermediate shaft between 99 Avenue and 100 Avenue. On Tuesday August 8, the crew plans to install the final pieces of pipe. This requires the removal of the plug covering the drop connection to the existing sewer.
There may be some odour experienced nearby for the period during which the plug is removed and the final piece of pipe is connected.
100 Avenue pump station
Work for the removal of the pump station was started on January 23, 2017.
A third crew on site was mobilized on July 24 to resume decommissioning of the pump station; however, with the recent rainfalls, sewage flow into the pump station was discovered, which does not permit worker entry to safely complete the manhole construction.
The crew is currently working with the drainage operations team to divert the flows back to the existing trunk sewer so work on the construction of the manhole can resume.
Progress of overall construction can be found on the August 4 update.
The air scrubber plays a major role in odour mitigation for the 100 Avenue shaft repair. In addition, there are also chemical injections (hydrogen peroxide injections and nitrate injections), into sewers of nearby pump stations. Hydrogen peroxide and nitrate will reduce the effects of hydrogen sulphide, a chemical created in sewer systems. This will help reduce odours and make the environment safer for our workers.