This map produced by the Environmental Health Division of the Washtenaw County Department of Public Health shows the latest estimation of the footprint of the Pall-Gelman 1,4-dioxane plume. Local officials say the contamination is spreading through a system of underground streams, contaminating the groundwater in those areas. Download larger version.Courtesy of Washtenaw County Department of Public HealthThe footprint of the Pall-Gelman 1,4-dioxane plume continues to expand further into Ann Arbor, city officials say, posing risks to human health and the environment. Two members of the Ann Arbor City Council who are particularly concerned about the problem — Sabra Briere and Chuck Warpehoski — are bringing forward a resolution Tuesday night, urging the Michigan Department of Environmental Quality to establish stricter cleanup criteria.Continue reading Pall-Gelman dioxane plume: Ann Arbor officials want stricter cleanup criteria to stop spread...