I can speak to the contaminants, or at least some of them that we monitor, but I would turn it over in terms of impacts on human health, I think.
Defence of course has locations across the country. We've been in operation for a very long period of time, and defence is a business that requires the use of a number of different types of chemicals, things like TCE, which is used to degrease metal parts. As you can imagine, in the context of military vehicle assembly, there's TCE used. There's benzene. Arsenic is another common substance that is used.
As well, there are lots of sites contaminated with petrochemicals and hydrocarbons, and then, increasingly, what we're seeing recently are more and more PFAS as a result of the use of firefighting foams.
I'd say those are the most common elements that we discover on contaminated sites.