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Work at Charny’s Drinking Water Production Plant

The City of Lévis tasked gbi with refurbishing the filters in Charny’s drinking water production plant and with repairing the drinking water reservoirs.  

Environment, Water treatment
Occupational hygiene, Potable water
Commissioning and optimization, 3D Planning , Engineering, Project design and supervision
Commissioning and optimization, 3D Planning , Automation and control, Electricity, Process, Structure
2019 - 2023

Our role in the project

The work included: the replacement of four filter bottoms and selection of the appropriate technology through the pre-purchasing of equipment; the installation and commissioning of the filter bottoms; the replacement of the filtering media; the structural assessment of, and repairs to, the concrete; as well as repairs to the wash water gutters.

We also worked on preparing the concrete surfaces and waterproofing the filters with a membrane certified NSF61 for drinking water, the replacement of the air wash supply valves and asbestos removal work. We were also tasked with carrying out electrical and control work, as well as commissioning and training.

Project particularities

Among the project’s specific features were serious problems related to the watertightness of the filters and reservoirs, as drinking water production had to be continued while the work was being done. In fact, it was essential that the work be done in phases in order to keep disruptions in plant operations to a minimum, in terms of both the quantity of water produced and its quality, and to comply with the standards set out in the Regulation Respecting the Quality of Drinking Water.  

Note that the construction work required interventions on the part of the plant’s operations staff in collaboration with the contractor.

Constraints and solutions

At the project launch meeting, gbi noticed on location a problem related to the distribution of the wash aeration in some of the existing filters, which led to them being inspected.

Repairing these filters was not initially part of the mandate, but this on-site observation revealed the presence of serious sealing problems, resulting in this being included in the repairs to be made.

While preparing the work site, gbi noticed that the distribution reservoir could not be bypassed to carry out the planned repair work. Therefore, gbi prepared plans and specifications for the addition of a partition wall in this reservoir to allow it to be bypassed in the future.

While work was underway, we noticed the presence of asbestos in the ceilings of the filter room. Our hygiene team developed the procedure to perform the work and supervised it.