Rocky Flats Cleanup Over

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The seven billion-dollar cleanup at Rocky Flats has reached a milestone.

The contractor says today that it's finished cleaning up plutonium-tainted buildings and soil on the rolling plains northwest of Denver.

Kaiser-Hill says it's proud of what it called a decade-long effort to --quote-- "complete the largest, most complex environmental cleanup project in United States history."

But it could be months before parts of the site are opened to the public as a federal wildlife refuge. Several regulatory hurdles remain before it's certified as safe.

Rocky Flats made plutonium triggers for nuclear weapons until 1992, when it was shut down because of safety concerns and the end of the Cold War.

The core plant covers nearly 400 acres inside a six-thousand-acre buffer zone.