Situated underneath Parc Des Rapides, the Alepin diversion and discharge structure is where all LaSalle’s wastewater must pass on its way to the treatment plant. Under a constantly increasing load, it must be refurbished to prevent a sewer backup.
Learn all about this project
November 2020 to October 2021.
Delays related to unforeseen situations at the underground works level coupled with the context of the pandemic causing delays in the supply of materials require a review of the completion date. All work will be completed in October 2021. This project will complete the work begun in 2018 to upgrade various components of the diversion and discharge structures.
In Parc des Rapides, south of Boulevard LaSalle, between 1er Avenue and Avenue Allion.
Work on the diversion and discharge structures at the Alepin station:
- Excavation down to the roof structure which is located roughly 14 metres underground
- Demolition and reconstruction of the underground chamber’s reinforced concrete roof slab
- Repairs to the chamber walls
- Installation of new prefabricated structural beams
- Filling and restoration of Parc Des Rapides, including the bicycle path, pedestrian trail and vegetation.
The Alepin diversion and discharge structure was built with reinforced concrete in the mid-1980s. In 2008, work was done to reinforce the roof slab. Since this structure is constantly subjected to all kinds of stresses (high water flow, organic compounds degrading the concrete, etc.), refurbishment works have become necessary.
In concrete terms, this project will strengthen the entire roof structure, including its support beams, to prevent a collapse that could cause wastewater backup into homes situated upstream from the structure.
This roof slab also supports the weight of the soil of this section of Parc Des Rapides. Its maintenance therefore allows the population to continue enjoying this green space alongside the St. Lawrence River.
Progress of the work and daily impacts
The city is taking steps to minimize the impact of public works projects on your day-to-day life. Read our article to learn about all project progress and the most recent notices sent to area residents.