It's difficult to answer precisely, Mr. Chairman, because each of these sites is different, and the cost, which is typically driven by the complexity of the particular contaminated site, is so variable that it's hard to know.
I'd be happy to provide in written form for the committee what we can provide, what we know now. Some of it may very well be approximate, but we can qualify it appropriately. It's difficult to answer, because they are just so different, and they will be at different stages and they take different periods of time to remediate.