New, and more sensitive, testing shows there has been further spread of the1-4 dioxane plume emanating from the old Gelman Sciences facility on Wagner Road in Scio Township. It has now gone about a mile beyond what was thought to be the edge of the plume. That is much closer to the Huron River and Barton Pond, which supplies Ann Arbor's drinking water. WEMU's David Fair discussed the latest developments with Kathleen Knoll, Scio Township trustee and Township representative on the Coalition for Action on Remediation of Dioxane.