<p>Workers at the Hanford nuclear reservation work around a a tank farm where highly radioactive waste is stored underground near Richland, Wash. on July 14 2010.</p>
February 23, 2013
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February 23, 2013 8 p.m.
6 tanks at Hanford nuclear site leaking
Ruptures just the latest issue at facility
YAKIMA, Wash. - Six underground tanks that hold a brew of radioactive and toxic waste at the nation's most contaminated nuclear site are leaking, federal and state officials said Friday, prompting calls for an investigation from a key senator.