I want to pick up a point that you made in your presentation, which is that it excludes things that have been there for a while and have been building up at the bottom of the lakes and all the rest of it. It's all about releases, right? How do you get to the virtual elimination of something that has been accumulating at the bottom of the lake? It seems to be a much more challenging proposition to be in a position to say, well, we can hardly find any trace of this using conventional equipment, so to speak, when in fact that stuff has been building up.
Are you really asking for the same degree of virtual elimination of things that have been building up? What would you have to do to get to that point so you could measure it?