FILE - In this Nov. 18, 2018, file photo, the Denver skyline is visible from the prairies in the Rocky Flats National Wildlife Refuge in Broomfield, Colo. Activists are asking a judge to unseal documents from a 27-year-old criminal investigation into the former Rocky Flats nuclear weapons plant. In an email made public Tuesday, July 30, 2019, the U.S. Attorney's Office in Denver said it has lost track of more than 60 boxes of files from the investigation. The activists say the documents could show whether the federal government did enough to clean up the site before turning part of it into a wildlife refuge and opening it to the public .(AP Photo/David Zalubowski, File)

BROOMFIELD | Broomfield city officials are suspending their search for investors to help build a toll road after a soil test found elevated levels of plutonium in the highway’s planned path.

The road would cross a buffer zone on the east side of a former nuclear weapons plant northwest of Denver. KUSA-TV reported Sunday the Broomfield City Council announced it was halting efforts to find a private partner for the project.

The Rocky Flats plant made plutonium triggers for nuclear warheads from 1952 to 1989. Later, the manufacturing site underwent a $7 billion cleanup.

State officials announced in August that a soil test found plutonium levels five times higher than the cleanup standard, but a second test found much lower levels. Officials were seeking more information on the results.

Information from: KUSA-TV, http://www.9news.com

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