Yes. I may ask my colleague, Trevor Shaw, to explain it in a little more detail. The classification of those—as you said, over 800 sites—are class 1, which are high priority. They are classified high priority because they are either close to a community, or close to human population, or they pose a risk that, because of a groundwater aquifer or a river, a population may be exposed to contaminants that are dangerous to human health as well as to environmental quality.
The contamination within those ranges are from a whole bunch of different things, and Mr. Shaw could explain.