Using the Phase Two Environmental Site Assessment findings, our Project Team identified contamination with trichloroethylene (TCE) and petroleum hydrocarbons resulting from the imported fill. To navigate the cost and schedule challenges, we devised an innovative approach merging strategic remediation and a Risk Assessment (RA). The remediation strategy focused on removing the highest concentrations of TCE-impacted soil that could not be effectively managed within the RA’s parameters. This ‘hot spot’ removal paved the way for property-specific standards for remaining contaminants, compliant with O.Reg.153/04.

By evaluating the hydrogeological conditions, future land use, and adjacent property considerations, our team crafted Risk Management Measures (RMMs) to minimize exposure of human and ecological receptors to residual soil and groundwater contaminants. Soil vapour screening and ecological protection measures were implemented to support on-site protection. A passive venting system was installed to prevent the off-site human receptors in adjacent condos from exposure to impacted soil vapour, notably methane, via vapour intrusion.