It's not just the contamination; it's also the volume of water.
The mining area is one area, but the area that is going to be impacted by the in situ, where they're actually going to be drawing down the aquifers.... And then of course you can get other waters flowing in, which may have a different purity, and also water flowing downwards into the areas from which the bitumen has been taken out. The actual water table will flow, and then other substances can flow in.
So it's not just a question in the tailings area; it's a question--which is a major concern to me--over the whole area where the bitumen is being developed.