Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume (2025 Data)

A series of annual geochemical models were created by RockWare utilizing RockWorks20 which were interpolated based on the 1,4-dioxane levels that were measured during 1986 through 2024. 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 2024 plume presented here was created from the RockWorks project database files on May 01, 2025 (Gelman6.sqlite). The grid file titled 2024-01-01_to_2024-12-31.RwGrd was converted by The Mannik and Smith Group (MSG) to a raster file compatible in ArcGIS and converted to polygons of areas of concentrations between the following values: 3 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 3 ppb level as this is the trigger for response if detected in sentinel wells in the 4th Consent Judgment. Field Name Field Description Depth1 The minimum depth of the well screen in feet below ground surface Depth2 The maximum depth of the well screen in feet below ground surface MAX_Value The maximum 1,4-dioxane concentration measured as parts per billion (ppb) at this boring in the year; non-detect values are given a value of one half the detection limit Bore Name associated with the boring Name The chemical name of the analytical result Year_tx The display text year for which this is the maximum dioxane concentration in that calendar year Year The year for which this is the maximum dioxane concentration in that calendar year POINT_X Easting in Michigan State Plane Coordinate System (South Zone - FIPS 2113), NAD83 international feet POINT_Y Northing in Michigan State Plane Coordinate System (South Zone - FIPS 2113), NAD83 international feet Tdata_YN Yes/No determination if this value is used as T-Data in the Rockworks geochemical model MAX_Value_tx The display text of the maximum 1,4-dioxane concentration measured at this boring in the year; non detect values are given as ND This is the latest version of the Dioxane Plume data. Earlier vintages are available at: Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume Map (2020 Data), Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume Map (2023 Data), and Gelman Site Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume (2024 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 [e-mail]. Report problems or data functionality suggestions to [e-mail]公司借助RockWorks20软件，基于1986年至2024年间测得的1,4-二氧六环（1,4-dioxane）浓度数据，构建了一系列年度地球化学模型。若某一自然年内对同一地层区间进行多次采样，则选取其中最高的1,4-二氧六环浓度值。每个年度模型的覆盖范围被限定在仅对应年度内采样井生成的多边形范围内，以避免在无数据区域开展插值计算。随后，基于岩性对年度地球化学模型进行过滤，剔除岩性判定为非渗透区域内的体素（voxel）。通过调用最大历史水位面（Maximum Historical Water Level Surface, MHWLS）网格模型，进一步约束模型，限制在无实测数据区域进行插值。最终，将体素模型转换为年度网格模型，网格单元的取值对应列体素中的最高浓度值。 本次展示的2024年污染羽流，是2025年5月1日基于RockWorks项目数据库文件（Gelman6.sqlite）生成的。名为2024-01-01_to_2024-12-31.RwGrd的网格文件，由曼尼克与史密斯集团（The Mannik and Smith Group, MSG）转换为兼容ArcGIS的栅格文件，并进一步划分为以下浓度区间对应的多边形区域：3 ppb、7.2 ppb、85 ppb、150 ppb、280 ppb、500 ppb、1000 ppb、1900 ppb、3000 ppb及5000 ppb。设置7.2 ppb浓度等值线，是因为该值对应密歇根州环境质量部（EGLE）现行的《第201部分》通用住宅清理标准（Generic Residential Cleanup Criterion, GRCC）。设置85 ppb浓度等值线，用于代表《第三项同意判决（Consent Judgement 3, CJ3）》中的饮用水标准。设置280 ppb浓度等值线，对应EGLE最新的地下水-地表水界面（Groundwater-Surface Water Interface, GSI）标准；1900 ppb则为蒸气侵入标准。EGLE对3 ppb浓度等值线进行等值线绘制，因为该值是第四项同意判决中哨兵井检出后的响应触发阈值。 字段名 字段说明 Depth1 井滤层距地表的最小深度，单位为英尺 Depth2 井滤层距地表的最大深度，单位为英尺 MAX_Value 本年度该钻探点测得的最高1,4-二氧六环浓度，单位为十亿分比浓度（ppb）；未检出值赋值为检测限的一半 Bore 与该钻探点关联的钻孔名称 Name 分析结果对应的化学物质名称 Year_tx 显示用年份，对应该自然年度内最高二氧六环浓度的记录年份 Year 该自然年度内最高二氧六环浓度对应的记录年份 POINT_X 密歇根州平面坐标系（南区，FIPS 2113）下的东向坐标，单位为NAD83国际英尺 POINT_Y 密歇根州平面坐标系（南区，FIPS 2113）下的北向坐标，单位为NAD83国际英尺 Tdata_YN 用于标识该值是否作为T数据参与RockWorks地球化学模型构建的是/否判定 MAX_Value_tx 本年度该钻探点测得的最高1,4-二氧六环浓度的显示文本；未检出值标注为ND 本数据集为二氧六环污染羽流数据的最新版本。早期版本可通过以下资源获取：格尔曼场地1,4-二氧六环污染——二氧六环污染羽流地图（2020年数据）、格尔曼场地1,4-二氧六环污染——二氧六环污染羽流地图（2023年数据）及格尔曼场地1,4-二氧六环污染——二氧六环污染羽流（2024年数据）。 本数据集用于格尔曼场地1,4-二氧六环污染网页地图（详见项目详情）。若您对格尔曼科学公司（Gelman Sciences, Inc）污染场地相关事宜有疑问，请联系Chris Svoboda，电话：517-256-2849，邮箱：[e-mail]。若需报告数据问题或提出功能优化建议，请发送邮件至[e-mail]。