The existing 99 Avenue sanitary trunk line that services over 100,000 customers needs to be replaced. This project will be completed in
2 stages, starting in July 2020 and we estimate the project will be finished by the end of 2024. In Stage 1, we are building a new tunnel along 99 Avenue, north on 148 Street and east on 101 Avenue. In Stage 2, we'll rehabilitate the existing tunnel on 99 Avenue. Once our work in done, both tunnels will be in service, increasing capacity in the trunk network.
About the 99 Avenue sanitary sewer
As seen by the map below, the 99 Avenue sanitary sewer moves wastewater from west Edmonton to the Gold Bar Wastewater Treatment Plant. The sewer is approximately 30 metres deep and services about 117,000 customers. For this project, the sewer needs rehabilitation between 142 Street and 151 Street.
Why the project is needed
This trunk line was built in 1975 and inspections have shown the existing trunk varies from fair to very poor condition. The existing trunk needs rehabilitation to ensure it continues to meet the current needs and growth for west Edmonton.
On the left image below, you will see an image of the current tunnel condition in very poor condition. The right image below is an image of what a tunnel should look like.