Maps
1,4-Dioxane Groundwater Plume Maps
The below maps of the groundwater plume are available from the Michigan Department of Environment, Great Lakes and Energy (EGLE) and Washtenaw County. Please keep in mind that a plume is a 3-dimensional distribution of contaminants in groundwater. Plume shape is affected by source spreading, geology, hydrology, and biological activities. The estimated plume boundaries on 2-dimensional maps are unable to show the depth to contamination or thickness of contaminated zone. Therefore, not all wells shown within the plume boundaries have detectable levels of 1,4-dioxane.
- EGLE's Gelman Site Groundwater Contamination Plume Map - 7.2 (2020)
- EGLE's Gelman Site Groundwater Contamination Plume Map (2020)
- Washtenaw County's 1,4-Dioxane Groundwater Plume Map (2019) (Please note this map is out-of-date, as it shows the 85 ppb plume area and does not show the expanded Prohibition Zone)
Interactive Web Map
EGLE has created an interactive web map for the Gelman Sciences site that provides historic and current information related to the investigation and remediation of the 1,4-dioxane groundwater contamination. The goal of the web map is for users to be able to view the data that is used by EGLE geologists and engineers in developing models created to describe the lithology and groundwater contamination plumes over 30 years of monitoring.