RÉALISATION

Environmental Remediation via Excavation

Client:

Hydro-Québec.

Objective:

The project involved dismantling a user station. The objectives were to characterize and manage the groundwater and excavated soil.

Scope of work:

Following the closure of a user station, Terrapex Environnement supervised the environmental monitoring of the site in accordance with the standards and procedures of the Québec Ministry of Sustainable Development, of Environment and Parks (MDDEP). Furthermore, the environmental remediation plan was approved by the MDDEP because the site was subject to Bill 72 of the MDDEP. Prior to the beginning of work, a health and safety protocol was prepared and explained at a meeting held on site. Remediation work included the supervision of the excavation and disposal of approximately 500 metric tons of impacted backfill.

The excavation was conducted in an area of the site where underground fuel installations were located (underground storage tanks, pump island and associated piping). Work also included the pumping/management of groundwater that accumulated within the excavation and tank nest. A technical report presenting the compilation and interpretation of all results was submitted to Hydro-Québec. This report was certified by a recognized ministry expert, Charles Anthony Hawke, also President of Terrapex.