Researchers at the nation's most contaminated nuclear site last year injected 5,000 gallons of molasses into the soil to try to clean up toxic groundwater near the Pacific Northwest's largest waterway. This week, they're trying vegetable oil. It's not the first time vegetable oil has been tried. Near Barstow, Calif., workers injected a number of organic materials, including lactate, ethanol and vegetable oil, into the soil at a Pacific Gas and Electric Co. site contaminated with hexavalent chromium. The site was the subject of the hit Julia Roberts movie, "Erin Brockovich." 

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