Without appropriate environmental site assessment reports and risk assessments, there may be potential for negative impacts from the brownfield redevelopment process itself.

When brownfield sites are redeveloped, residual contamination in the soil may be disturbed and could result in further contamination if not handled properly. For example, there may be some risk of contamination migrating to neighbouring lands through groundwater, or runoff into surface water.

However, concerns about the potential for biological, physical and chemical impacts on human and environmental health that may occur from the movement of these contaminants can be addressed effectively through appropriate remediation technologies and construction techniques.

More:
What are brownfields?
What are the benefits of brownfield redevelopment?
What are the barriers to developing brownfields?
What can be done with brownfield sites?
How is brownfield remediation regulated in Ontario?
How can members of the public get involved in local brownfield redevelopments?
How can I learn more about brownfield redevelopment?