The Signatories are affected by the release and threatened release of the carcinogen 1,4-dioxane from the Gelman Site, in part, due to: public potable water supply contamination; private potable water well contamination; building vapor intrusion; natural resources contamination and degradation; and risk of additional human cancers through various routes of exposure to the contamination.
The former Gelman plant wastewater disposal practices have contaminated on-site and off-site groundwater with dioxane. The current dioxane groundwater plume is approximately four miles long and one mile wide and has contaminated local lakes, creeks, residential drinking water wells, and a City of Ann Arbor municipal water supply well. A large portion of the off-site dioxane plume concentration is very high (e.g., greater than 1,000 ug/L). The USEPA dioxane drinking water criterion is 0.35 ug/L at a 1 in a 1,000,000 excess lifetime cancer risk level.
The dioxane plume is migrating in northern, western, eastern and southern directions with no effective off-site hydraulic control. Numerous Scio Township and Ann Arbor Charter Township residential drinking water wells are down-gradient of the plume in the eastern, western and northern regions. The dioxane groundwater concentrations and migration present an imminent and substantial endangerment to public health. Federal control of a cleanup is necessary to correct the serious and on-going threats to the public health and continuing Michigan Department of Environmental Quality delays and mismanagement on this vast groundwater contamination site which has adversely impacted the community.
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