Michigan Dept. of Environment, Great Lakes, and EnergyThe estimated depth to 1,4-dioxane was created utilizing the latest RockWorks project database files on June 13, 2021 by RockWare Inc. They produced a new grid titled 2020_Depth_To_7.2_Or_Higher.RwGrd . in which the cell size of the grid, 50 feet x 50 feet, matched the grid size of the annual plumes. The z value was a calculation of the depth to 7.2 ppb 1,4-dioxane using the 2020 geochem solid model (v20210710) . The grid was then converted to contour lines in ArcGIS and posted to ArcGIS Online. Field Name Field Description Contour Contour value in numerical format Contour_text Contour value in text format This is a previous version of the data. The newest vintage is available at: 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 .ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/49232e5dd8bb4146839bd7665e8059b6_0engState of Michigan Open Data PortalPublicGelman Site of 1,4-Dioxane Contamination - Depth to Dioxane (2020 Data) [Michigan]Web servicesMichigan2020