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Rue Saint-Antoine in Contrecœur

In order to avoid wastewater overflows at its pumping station, the City of Contrecoeur tasked us with designing and sizing the new sanitary and stormwater sewer pipes under Rue Saint-Antoine to accommodate the adjacent area.  

Water and sewer systems

The importance of infrastructure

To prepare to separate the combined sanitary/storm system in this municipal sector, gbi carefully devised a brilliant six-phase master plan to resolve the problem of wastewater overflow at the Contrecoeur wastewater treatment plant.

gbi separated stormwater from the sanitary sewer system and directed the stormwater from Rue Saint-Antoine to the St. Lawrence River, which is west of the street. The team of engineering experts designed a stormwater outfall behind the city hall, leading to the river.

Ministry requirements

To meet the government standard on the quality of stormwater discharged into the St. Lawrence River, prescribed by the Ministère de l’Environnement et de la Lutte contre les changements climatiques (MELCC/Ministry of the Environment and the Fight Against Climate Change), it is strictly required to treat low-intensity rainfall once every ten years for the entire water catchment, equivalent to 60% of the treatment of suspended solids.

Work could be carried out only from September 1st to March 1st to meet the requirements of the Ministère des Forêts, de la Faune et des Parcs (MFFP/Ministry of Forests, Wildlife and Parks): to protect species such as the copper redhorse (endangered), the bridle shiner (vulnerable), the map turtle (vulnerable), the muskrat and waterfowl (geese, Canada geese, ducks) during nesting and migration periods.

Improving water quality

By reducing the volume of water sent to the water treatment plant, it is now much less expensive to treat this water, which was formerly sent to the water treatment plant, where costs are significantly higher, notably because of the chemicals used. The municipality is thus achieving considerable savings.

This project completed by gbi has helped reduce wastewater overflows, which has improved water quality. This is important, as many citizens fish in the river.

This was great news—and even more so because the region hosts the popular Festival de la Brimbale de Contrecoeur in February, a family-oriented activity that gives many people a chance to discover ice fishing at the ice shanty village on the river, 45 minutes from Montreal.