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Flint – Officials say the sale of remaining portions of a massive former manufacturing site in Flint are on hold after another kind of chemical contamination was confirmed.

The Flint Journal reports the update comes after toxins known as per- and polyfluoroalkyl substances, or PFAS , were found at Buick City, where Detroit-based General Motors once built cars.

Bruce Rasher, redevelopment manager for the Revitalizing Auto Communities Environmental Response Trust, says it’s continuing to market the property but won’t close on a sale “until we have a deeper understanding of PFAS impacts at the site” and come up with a “comprehensive remedial strategy.”

Most of Buick City closed in 1999, creating one of Michigan’s largest brownfield sites.

Portions have already been redeveloped and the U.S. Environmental Protection Agency has been overseeing cleanup.

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