Thanks for the question.
There is very clear guidance on how to delineate contamination. There's a lot known about these chemicals—how they behave in the environment, how they behave in groundwater and soil, and how they move based on geology and other characteristics. The source of contamination is well understood at these sites based on a very science-rigorous process of identifying the concentrations and how they're moving across a property.
If they move from federal land to a provincial space, clearly the building landowner gets engaged. The province in question also gets engaged. It's a very collaborative process, from that perspective.