Michigan Dept. of Environment, Great Lakes, and EnergyThe estimated depth to the 2024 1,4-dioxane was created utilizing the latest RockWorks project database files on May 01, 2025 from RockWare Inc. The grid file titled 2024_Depth_To_7.2_Or_Higher.RwGrd. was created from the Rockworks geochemistry solid model titled 2024-01-01_to_2024-12-31.RwMod. The grid file was converted to contour lines in ArcGIS and posted to ArcGIS Online. This is the latest version of the Depth to Dioxane data. Earlier vintage is available at: Gelman Site of 1,4-Dioxane Contamination - Depth to Dioxane (2020 Data) and Gelman Site of 1,4-Dioxane Contamination - Depth to Dioxane (2023 Data). This data is used in the Gelman Site of 1,4-Dioxane Contamination web map ( item details ). If you have questions regarding the Gelman Sciences, Inc site of contamination contact Chris Svoboda at 517-256-2849 or svobodac@michigan.gov . Report problems or data functionality suggestions to EGLE-Maps@Michigan.gov. Field Name Field Description Contour Depth in feet below ground surface to groundwater at or above 7.2 parts per billion 1,4-dioxane Contour_tx The text label for the contourArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/517f3f0136e94ad09a0b729f7797112c_0engState of Michigan Open Data PortalPublicGelman Site of 1,4-Dioxane Contamination - Depth to Dioxane (2024 Data) [Michigan]Web servicesMichigan2024