To improve EGLE's data visualizations of the Gelman Site project data and to develop an interactive 3D virtual conceptual site model (VCSM), EGLE utilizes RockWorks, an integrated geological database, analysis, and visualization software developed by RockWare, Inc. The locations included in this feature layer include all bore and sample locations that are in the current RockWorks project database (Gelman5_v2023.sqlite dated 02/27/2024). Data tied to each location includes lithological information, 1,4-dioxane sample results, and groundwater level measurements. The custom pop-up displays the standardized bore location name and the following information: Well Type: includes one of the following: Monitoring Well, Residential Well, Extraction Well, Injection Well, Horizontal Well, Test Boring, Seismic Interpolation Point, Surface Water, or other. Ground Elevation: elevation in feet at the point extracted from the March 2019 LiDAR digital elevation model from Southeast Michigan Council of Governments (SEMCOG). Units are in feet referenced to the North American Vertical Datum 1988 (Geoid12B).Collar Elevation: the top of well casing elevation used for reference when collecting groundwater level measurements. Source of information includes the EGLE Access database and supplemented with boring log or well construction records if available. Total Depth: feet below ground surface to the well or boring terminus. Source of information includes the EGLE Access database and supplemented with boring log or well construction records if available. Screen Interval: depth below ground surface to the top and bottom of the well screen. Source of information includes the EGLE Access database and supplemented with boring log or well construction records if available. Used for Lithology Model: yes/no field indicating if the location has associated lithological information that was used for input into the RockWorks lithology 3d solid voxel model.Used for Max Groundwater Elevation Model: yes/no field indicating if the location has associated groundwater level measurements that were was used as input for the Maximum Groundwater Elevation Model.Used for Geochem Models: yes/no field indicating the location has associated 1,4-dioxane results used as input to create the annual (1986 - 2023) 3d solid voxel models and 2d grid surface files. Additional fields specifying source of information, such as source of northing and eastings, can be viewed within the attribute table. Boring logs and well construction documents, if available, are stored as attachments and can be viewed by clicking on the hyperlink.At the bottom of the pop-up, the "Show Related Records" link will open up separate windows showing the lithology, water level measurements, or 1,4-dioxane results that are associated with the selected location. This is the latest version of the bore locations data. An earlier vintage is available at: Gelman Site of 1,4-Dioxane Contamination - All Bore Locations Layer Group (2020 Data).

Field Name

Field Description

Name

The name associated with the boring

Well Type

The type of well that this represents. Values include the following: Monitoring Wells, Residential Wells, Extraction Wells, Injection Wells, Horizontal Wells, Test Boring, Seismic Interpolation Point, Surface Water, and 'other'.

Northing (ft)

Northing in Michigan State Plane Coordinate System (South Zone - FIPS 2113), NAD83 international feet

Easting (ft)

Easting in Michigan State Plane Coordinate System (South Zone - FIPS 2113), NAD83 international feet

Ground Elevation (ft)

Ground surface elevation of the well in feet; taken from SEMCOG 2019 Digital Elevation Model referenced to NAVD88 (Geoid12B)

Total Depth (ft below ground service)

The maximum depth, in feet below ground surface, that this boring was drilled to

Screen Interval (ft below ground surface)

The minimum and maximum depth, in feet below ground surface, of the well screen

Used for Lithology Model?

Whether this boring is used in creating the RockWorks lithologic model

Used for Max Groundwater Elevation Model?

Whether this boring is used in creating the RockWorks Max Groundwater Elevation model

Used for Geochem Models?

Whether this boring is used in creating the Rock Works geochemical (1,4-dioxane concentration) model

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.

The 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 NameField DescriptionContourContour value in numerical formatContour_textContour value in text formatThis 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 theGelman 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 toEGLE-Maps@Michigan.gov.

The estimated depth to the 2023 1,4-dioxane was created utilizing the latest RockWorks project database files on February 27, 2024 from RockWare Inc. The grid file titled 2023_Depth_To_7.2_Or_Higher.RwGrd. was created from the Rockworks geochemistry solid model titled 2023-01-01_to_2023-12-31.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. An earlier vintage is available at: Gelman Site of 1,4-Dioxane Contamination - Depth to Dioxane (2020 Data).

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_text

The text label for the contour

MERGE_SRC

RockWorks grid file from which the contour line was created from

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.

A series of annual geochemical models were created by RockWare utilizing RockWorks v2021 which were interpolated based on the 1,4-dioxane levels that were measured during 1986 through 2020. In cases where the same intervals were samples on more than one occasion during a given year, the highest 1,4-dioxane values were used. The extent of each annual model were limited to polygons based on only the wells that were sampled during the associated year to eliminate interpolating in areas where data is not present. The annual geochemical models were then filtered based on lithology to eliminate any voxels within the areas deemed impermeable based on lithology. The models were further constrained by utilizing the maximum historical water level surface (MHWLS) grid model to further restrict the interpolation from areas lacking measured data. Finally, the voxel models were converted to annual grid models, in which the cell values are based on the highest value within the corresponding column of voxels.The 2020 plume presented here was created from the RockWorks project database files on June 09, 2021 (Gelman3.sqlite v2021-04-29). The grid file titled 2020-01-01_to_2020-12-31.RwGrd (v20210710) was converted by The Mannik and Smith Group (MSG) to a raster file compatible in ArcGIS and a custom color scheme was applied with the shades becoming darker as concentrations increase. Iso-concentration lines were then generated at the following concentrations: 4 ppb, 7.2 ppb, 85 ppb, 150 ppb, 280 ppb, 500 ppb, 1000 ppb, 1900 ppb, 3000 ppb, and 5000 ppb. The 7.2 ppb lines were created because it represents the current EGLE Part 201 generic residential cleanup criterion (GRCC). The 85 ppb lines were created to represent the Consent Judgement 3 (CJ3) drinking water criteria. The 280 ppb lines were created because that is the new EGLE groundwater-surface water interface (GSI) criterion, and 1900 ppb is the Vapor Intrusion criteria. EGLE is contouring the 4 ppb level because that could become a new trigger for response if detected in sentinel wells if the proposed 4th Consent Judgment is approved.To host the plume files on EGLE's ArcGIS Online, MSG prepared the raster file, contour layer, and the input points used as the input for the specified year model in ArcGIS Pro. The points were labeled using three levels of detail. When zoomed out beyond 1:5000 no labels appear at the points because it would be too dense to read and cover the underlying plume. When zoomed in between 1:5000 and 1:1200, the bore name and maximum 1,4-dioxane at that well in 2020 appear. When zoomed in closer than 1:1200, the labels show the boring name, sample depth interval, and maximum 1,4-dioxane at that interval for 2020. The plume layer was set to 7.5% transparency (this can be adjusted later) and shared as a web tile layer using the ArcGIS Online / Bing Maps / Google Maps tiling scheme for levels of detail 12 – 19.This is a previous version of the data. The newest vintage is available at: Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume (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.

A series of annual geochemical models were created by RockWare utilizing RockWorks v2021 which were interpolated based on the 1,4-dioxane levels that were measured during 1986 through 2020. In cases where the same intervals were samples on more than one occasion during a given year, the highest 1,4-dioxane values were used. The extent of each annual model were limited to polygons based on only the wells that were sampled during the associated year to eliminate interpolating in areas where data is not present. The annual geochemical models were then filtered based on lithology to eliminate any voxels within the areas deemed impermeable based on lithology. The models were further constrained by utilizing the maximum historical water level surface (MHWLS) grid model to further restrict the interpolation from areas lacking measured data. Finally, the voxel models were converted to annual grid models, in which the cell values are based on the highest value within the corresponding column of voxels.The 2020 plume presented here was created from the RockWorks project database files on June 09, 2021 (Gelman3.sqlite v2021-04-29). The grid file titled 2020-01-01_to_2020-12-31.RwGrd (v20210710) was converted by The Mannik and Smith Group (MSG) to a raster file compatible in ArcGIS and a custom color scheme was applied with the shades becoming darker as concentrations increase. Iso-concentration lines were then generated at the following concentrations: 4 ppb, 7.2 ppb, 85 ppb, 150 ppb, 280 ppb, 500 ppb, 1000 ppb, 1900 ppb, 3000 ppb, and 5000 ppb. The 7.2 ppb lines were created because it represents the current EGLE Part 201 generic residential cleanup criterion (GRCC). The 85 ppb lines were created to represent the Consent Judgement 3 (CJ3) drinking water criteria. The 280 ppb lines were created because that is the new EGLE groundwater-surface water interface (GSI) criterion, and 1900 ppb is the Vapor Intrusion criteria. EGLE is contouring the 4 ppb level because that could become a new trigger for response if detected in sentinel wells if the proposed 4th Consent Judgment is approved.To host the plume files on EGLE's ArcGIS Online, MSG prepared the raster file, contour layer, and the input points used as the input for the specified year model in ArcGIS Pro. The points were labeled using three levels of detail. When zoomed out beyond 1:5000 no labels appear at the points because it would be too dense to read and cover the underlying plume. When zoomed in between 1:5000 and 1:1200, the bore name and maximum 1,4-dioxane at that well in 2020 appear. When zoomed in closer than 1:1200, the labels show the boring name, sample depth interval, and maximum 1,4-dioxane at that interval for 2020. The plume layer was set to 7.5% transparency (this can be adjusted later) and shared as a web tile layer using the ArcGIS Online / Bing Maps / Google Maps tiling scheme for levels of detail 12 – 19.This is a previous version of the data. The newest vintage is available at: Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume (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.