The City has identified that the 1.5 meter diameter sanitary trunk sewer along 151 Street from 100 Avenue to 99 Avenue is in poor structural condition and requires immediate rehabilitation. Most of the work for this project is completed underground, but several shafts are required to access the sewer line.
- The sanitary trunk sewer along 151 Street from 100 Avenue to 99 Avenue requires immediate rehabilitation given its poor structural condition.
- Two shafts are required along 151 Street from 100 Avenue to 99 Avenue to access the deep trunk for rehabilitation. The shaft at 99 Avenue was completed in 2015. The rehabilitation work will be completed underground through these two shafts.
- A sewage bypass pipe will be installed along 151 Street from 100 Avenue to 99 Avenue.
What is involved with this project?
The project consists of the installation of two shafts that connect the existing sanitary sewer system to the deep tunnels that run along 151 Street. City crews will install a shaft at the intersection of 151 Street and 99 Avenue and a shaft north of 100 Avenue at 151 Street. The rehabilitation work will be completed underground through these two shafts.
Roadways and any other areas that are disturbed by the construction will be restored to their initial condition at the completion of the projects.
During construction, the intersection of 151 Street and 99 Avenue will be closed and only local traffic access allowed. North of 100 Avenue, 151 Street will be closed to traffic. During non-rush hour traffic, there will be minor disruptions to east-west bound traffic at the intersection of 100 Avenue and 151 Street. The City will minimize traffic disruptions as much as possible.
Several condition assessments are being completed for sanitary trunk sewers in the area of 151 Street and 99 Avenue. The assessment of the trunk sewer along 99 Avenue from 151 Street to 142 Street has now been completed and the first 50 m (165 ft) has been identified to be in critical condition. The trunk sewer is a critical piece of infrastructure as it services a large portion of west Edmonton, and this sewer will need to be rehabilitated.
While the design for the rehabilitation of the 99 Avenue trunk sewer proceeds, a bypass tunnel will be constructed (as a precautionary measure) to allow flow to bypass the portion of the existing trunk sewer that is in the worst condition. This new tunnel will also help with Phase I construction by allowing work to continue if it rains, and it will form a part of the ultimate rehabilitation solution of the existing sewer.
The bypass tunnel will require a second shaft about 50 m (165 ft) east of the current work site at 151 Street and 99 Avenue.