ANN ARBOR – For the second time in as many weeks, an environmental remediation professional is warning that people living near Ann Arbor’s West Park could be exposed to the toxic chemical dioxane.

Dan Bicknell, president of Global Environment Alliance LLC, recently investigated the potential for basements in the West Park area to flood with groundwater contaminated by the Gelman dioxane plume.

Based on a review of hydrogeological cross-sections and monitoring-well data, Bicknell told Michigan Department of Environmental Quality officials at meeting last week that dioxane could be getting into people’s basements already, though he hasn’t done any testing of water samples to find out.

On Friday, Bicknell, who is credited for discovering the Gelman plume in 1984, once again sounded the alarm, this time sounding more urgent.

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