I'd love to understand more clearly the risks of these contaminated sites. Would just the mere presence of, say playing on a Superfund soccer field expose you

I'd love to understand more clearly the risks of these contaminated sites. Would just the mere presence of, say playing on a Superfund soccer field expose you to those chemicals? Or is it more around if you were to drink the water from these sites then you would be at risk? Same goes for any offices that happen to be sitting on Superfund sites.