Potable Water Treatment — New Plant and Upgrade of the Existing Plant, Chisasibi, Baie-James

This major project involved the complete construction of a new potable water treatment plant to provide the community of Chisasibi with a reliable, high-quality water supply, replacing outdated facilities.

The work carried out included:

• Supply and installation of an ultrafiltration system capable of treating 3,992 m³/day, including all associated subsystems, chemical dosing, membrane backwash equipment, instrumentation, valves, fittings, and associated piping;
• Supply and installation of two stainless steel treated water tanks, each with a capacity of 25,000 litres;
• Supply and installation of distribution pumps;
• Installation of a temporary raw water pumping system;
• Modifications to the existing raw water pumping well and adjustments to the existing plant piping to feed the new plant;
• Decommissioning and dismantling of the existing plant;
• Supply and installation of a sand removal system in the existing plant to remove sand from the raw water before it is delivered to the new treatment plant.

This project provided the community with modern, high-performance infrastructure that meets the latest standards, ensuring a reliable, safe, and sustainable service adapted to the logistical realities of northern Québec.

Project highlights:

• Work in remote regions, requiring complex logistics for transporting heavy equipment and specialized materials;
• Rigorous workforce planning;
• Enhanced interdisciplinary coordination to optimize work;
• Work performed while keeping the existing plant operational;
• Installation of a reliable and efficient temporary raw water pumping system to supply the existing plant during work in the raw water pumping well;
• Installation of two stainless steel tanks, each 25,000 L and over 6 meters in height;
• Installation of multiple chemical systems, including sodium hypochlorite, citric acid, hydrochloric acid, sodium thiosulfate, sodium hydroxide, and sodium carbonate.