Congresswoman Debbie Dingell (MI-12) today sent a letter to Michigan Department of Environmental Quality (MDEQ) Director Keith Creagh urging the state to take long-overdue action to finalize stricter cleanup standards for 1,4-dioxane that will bring the level permissible in groundwater more in line with the national standard and help accelerate cleanup of an underground dioxane plume that has been spreading through groundwater systems in Ann Arbor for decades
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