Properties whose soil and groundwater have been impacted by previous commercial or industrial use, commonly known as brownfields, can be a challenge, but a rewarding one, for redevelopment.
Our involvement in the project goes back to the site acquisition phase, and has included site remediation, geotechnical engineering, hydrogeology, risk assessment, inventory and removal of designated substances, archaeology and natural environment services, as well as consultation with the public and municipal decision-makers.
Investigations determined that due partly to the area’s industrial past, some of the century-old fill along the river included elevated concentrations of metals and polycyclic aromatic hydrocarbons (PAHs) that exceeded applicable standards for residential and park redevelopment. The majority of this soil was remediated through excavation and landfill disposal. In other parts of the property to be used as parkland, a screening level risk assessment found it was acceptable to leave some of the impacted soil in place and cover it with a clean soil cap.
A beneficial use was found for processed bedrock excavated as part of a municipal public light rail transit tunnel project underneath central Ottawa. This excavated material was used to backfill the remedial excavation and construct engineered fill pads for support of low-rise residential foundations and buried service lines on the property.
An archaeological investigation identified potential sites of interest buried below ground that required careful monitoring and handling during remediation.
Our involvement in the master-planned Greystone Village project, which includes brownfields redevelopment and historic building aspects, earned a “Brownie” award from the Canadian Brownfields Network in 2018. The project also received a LEED ND v4 Silver certification, for Neighborhood Development.
