VALGO Environment was commissioned by Procova (general contractor for the project) as part of the renovation and reconstruction of a Hydro-Québec building located in Saint-Jérôme, Quebec. The task involved excavating saturated soils and replacing them with soils possessing appropriate geotechnical characteristics for the construction project.
Issue and Objectives
The excavations carried out by Procova contained groundwater that needed to be pumped out to continue the works within the excavations and subsequent backfilling. The groundwater was laden with suspended solids, necessitating treatment before it could be discharged into the sewer system.
Solutions implemented by VALGO Environment
VALGO Environment established a four-stage treatment system to manage the significant amount of suspended solids (SS):
- Pumping of excavation water into a well equipped with a protective geotextile acting as the initial SS retention screen.
- Transfer of pumped water into a filtering bag placed within a first container (retention basin).
- Pumping of filtered water from the filtering bag into a second container (settling basin).
- Two stage filtration (10 microns and then 5 microns) using successive pocket filters.
For these operations, VALGO Environment was responsible for:
- the design and sizing.
- The supply of equipment.
- The operation of the system.
- The maintenance of the entire water treatment line.
Details and key figures
- Duration: 3 months (from September to November 2022)