- Associated Press - Saturday, May 21, 2016

ANN ARBOR, Mich. (AP) - State officials want to collect water samples in the West Park area of Ann Arbor due to concerns that groundwater contaminated by a toxic chemical may be seeping to the surface.

The Michigan Department of Environmental Quality plans to start the groundwater collection next week, The Ann Arbor News reported (http://bit.ly/1s18xVC ).

The chemical is dioxane, an industrial solvent. Federal agencies say long-term exposure could cause health problems, including cancer.

It was used by Gelman Sciences at its former facility in Ann Arbor and dumped into the surrounding environment between the 1960s and 1980s.

Officials with the state Department of Environmental Quality estimate that the plume has contaminated 3 square miles of groundwater, and it continues to slowly spread every year.

Pall Corp, which acquired Gelman Sciences in 1997, is operating under a consent judgment to remove dioxane from the ground.

The DEQ will work with the city and county to determine where areas of shallow groundwater might present an exposure pathway, Mitch Adelman, district supervisor for the DEQ’s Remediation and Redevelopment Division, told the newspaper.

Adelman said that includes where groundwater rises to the surface and seeps out of the ground and where there are wet basements and potential for vapor intrusion into homes.

“We are planning on sampling seeps, which some people may also know as springs,” he said.

Shallow monitoring wells could be installed next month.

Michigan is looking to revise and toughen statewide standards for dioxane in groundwater from 85 parts per billion to 7.2 parts per billion.

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Information from: The Ann Arbor News, http://www.mlive.com/ann-arbor

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