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Hanford's tanks hold some 53 million gallons of highly radioactive waste — enough to fill dozens of Olympic-size swimming pools — and many of those tanks are known to have leaked in the past. An estimated 1 million gallons of radioactive liquid already leaked there.
The tanks also are long past their intended 20-year life span — raising concerns that even more tanks could be leaking — though they were believed to have been stabilized in 2005.