I can't speak to that. Custodians would be the best place to identify where all their sites are and what activities led to that contamination.
You are quite right, honourable member, that the contamination was resulting mostly from aqueous film-forming foams that would have been applied either to extinguish fires or to train firefighters on how to use those foams. On the repeat applications, those would be at military applications or airports or other installations that would have had those activities.