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CLARENDON, Vt. (AP) — A second round of tests of wells that serve a business park outside of Rutland has found slightly higher levels of chemical contamination that the first tests showed.

Chuck Schwer, waste management director for the Department of Environmental Conservation, told the Rutland Herald on Friday that the levels of PFOA and PFOS were still relatively low and close to the Vermont limit of 20 parts per trillion for the toxic chemicals.

Vermont officials believe firefighting foam used to extinguish a fire from a 1986 plane crash is the source of the contamination.

Schwer said the state was working with a consultant to design and install a carbon filtration system for two wells that serve about a half-dozen businesses.

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Information from: Rutland Herald, http://www.rutlandherald.com/