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In page Rocky Flats Plant:

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Rockwell International was replaced by EG&G as primary contractor for the Rocky Flats plant.[1] EG&G began an aggressive work safety and cleanup plan for the site that included construction of a system to remove contamination from the groundwater of the site. The Sierra Club vs. Rockwell case was decided in favor of the Sierra Club. The ruling directed Rocky Flats to manage plutonium residues as hazardous waste.[citation needed]