In September 2012, ENUTECH was mandated to carry out the in situ environmental remediation of soils and groundwater contaminated by perchlorethylene – or PCE – (dry-cleaning solvent) on a site in LaSalle.
As a part of this mandate :
Soil contamination and decontamination notices have been registered within the Bureau de la publicité des droits
One request or a Certificate Authorization was prepared and sent to the ministère de l’Environnement et de la Lutte contre les changements climatiques (MELCC)
A complementary characterization of soils and groundwater was carried out, followed by soil and groundwater remediation using an in situ treatment process
Characterization of Contaminated Soils
Before ENUTECH’s work, another firm had initiated a characterization of the contaminated soils and groundwater to assess the extent of contamination. After that, ENUTECH carried out a further exhaustive characterization. The maximum concentration measured on the site after the characterization work was 39,500 mg/kg perchlorethylene (PCE). An excavation was performed to remove the shallow contaminated soils, which reduced the maximum concentration measured before treatment to 2,260 mg / kg.
Remediation of Contaminated Soils
In-situ soil and groundwater remediation work was conducted between May 2014 and January 2017 after obtaining Certificate Authorizations in December 2013. A reducing biogeochemical solution was periodically injected into the site's soils and groundwater to degrade perchlorethylene (PCE).
Injection wells were installed to create three permeable reactive barriers to treat the groundwater. Soils were treated via the injection wells and by Direct Push as well.
Following the in situ rehabilitation work, the soils found in the initially determined enclave met criterion "B" of the Intervention Guide for a 99% reduction in perchlorethylene (PCE) concentrations.
