Join the Sierra Club Huron Valley Group at the Downtown Ann Arbor District Library, where prominent local environmental advocate, citizen scientist, and community organizer Roger Rayle will give an update on the Gelman plume. Roger is chair of the Coalition for Action on Remediation of Dioxane (CARD), an organization that has been crucial in responding to the Gelman plume. Roger is widely recognized for compiling, mapping, and visualizing environmental data. He has spent decades creating detailed visual aids, spreadsheets, and interactive maps to help the public, local officials, and regulators track the movement, concentration, and expansion of the Gelman 1,4-dioxane plume over time.