On Wednesday, February 8th, 2012, at 19:24:53h +0000, J G Miller wrote:

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Hanford officials had estimated there were about 10 kilograms of
plutonium in the site's 56 million gallons of radioactive sludge.

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Sorry, I missed out the important update --

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Now, that 10-kilogram estimate has risen to at least 30 kilograms
and as much as 130 kilograms of plutonium.

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Do not forget that plutonium is not only highly radioactive,
it is also highly toxic.