Three workers at Dugway Proving Ground uncovered a small amount of poisonous mustard agent at an old dump on Thursday, apparently with no ill effects.

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The old chemical warfare material was discovered during a survey to find sites that need to be cleaned up under the federal Resource Conservation and Recovery Act, said Melanie Moore, spokeswoman for Dugway. The workers were wearing safety gear, and were treated with decontamination solution at the site, 700 yards south of the base's Carr Facility.The workers were checked at the Dugway clinic on Thursday, with observations continuing over the weekend. They were rechecked on Monday. They showed no symptoms, Moore said Tuesday.

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