I'm not a scientist and I can't speak to Safety Code 6--we rely on Health Canada's expert advice--but I can tell you that in surveys we have done in the environment...and in fact, in a City of Toronto study based on concerns from the City of Toronto, they were considering a precautionary principle as well. In response to that study in 2002, we re-evaluated just last year. We measured at 61 locations randomly selected around the city of Toronto.
The worst case was one-twentieth of Safety Code 6 limits. The best of those 61 locations was 125,000 times below Safety Code 6 limits. The average was about 5,400 times below Safety Code 6 limits. That might just give you a perspective on what we're actually seeing in the environment. Generally speaking, it's very, very well below Safety Code 6 in the general environment.