Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume (2024 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) and Gelman Site of 1,4-Dioxane Contamination - Dioxane Plume Map (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 [e-mail]. Report problems or data functionality suggestions to [e-mail]公司借助RockWorks20软件构建了一系列年度地球化学模型，模型基于1986年至2024年间测得的1,4-二氧六环(1,4-dioxane)浓度进行插值运算。若某一给定年份内对同一地层区间多次采样，则选取其中最高的1,4-二氧六环浓度值用于建模。每个年度模型的覆盖范围仅限定于对应年份内开展过采样的井位所对应的多边形区域，以避免在无实测数据的区域进行插值。 随后基于岩性对年度地球化学模型进行过滤，移除岩性判定为不透水区域内的体素(voxel)。模型进一步通过最大历史潜水面(maximum historical water level surface, MHWLS)网格模型进行约束，进一步限制在无实测数据区域的插值行为。最终将体素模型转换为年度网格模型，网格单元的取值基于对应体素列中的最高浓度值。 本次展示的2024年污染羽流基于2025年5月1日的RockWorks项目数据库文件(Gelman6.sqlite)构建。名为2024-01-01_to_2024-12-31.RwGrd的网格文件由Mannik and Smith Group(MSG)转换为兼容ArcGIS的栅格文件，并进一步转换为按以下浓度区间划分的多边形区域：3 ppb、7.2 ppb、85 ppb、150 ppb、280 ppb、500 ppb、1000 ppb、1900 ppb、3000 ppb及5000 ppb。 7.2 ppb阈值线的设置是因为该值对应当前EGLE第201部分通用住宅清理标准(generic residential cleanup criterion, GRCC)。85 ppb阈值线用于代表第三号合意判决(Consent Judgement 3, CJ3)的饮用水标准。280 ppb阈值线对应EGLE最新的地下水-地表水界面(groundwater-surface water interface, GSI)标准，而1900 ppb则为蒸气入侵(Vapor Intrusion)标准。EGLE对3 ppb阈值线进行等值线绘制，因为该值是第四号合意判决中哨兵井检出该污染物后的响应触发阈值。 ### 字段说明 | 字段名 | 字段说明 | | ---- | ---- | | Depth1 | 井筛管距地表的最小深度（单位：英尺） | | Depth2 | 井筛管距地表的最大深度（单位：英尺） | | MAX_Value | 本年度该钻孔处测得的最高1,4-二氧六环浓度（单位：十亿分率(parts per billion, ppb)）；未检出值记为检测限的一半 | | Bore | 该钻孔的关联名称 | | Name | 分析结果对应的化学名称 | | Year_tx | 对应该日历年度内最高二氧六环浓度的显示文本年份 | | Year | 该日历年度内最高二氧六环浓度对应的年度 | | 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RockWorks地球化学模型中的T数据的二值标识（是/否） | | MAX_Value_tx | 本年度该钻孔处测得的最高1,4-二氧六环浓度的显示文本；未检出值记为ND | 本次数据集为二氧六环污染羽流数据的最新版本，旧版数据可通过以下资源获取：Gelman站点1,4-二氧六环污染——二氧六环污染羽流图（2020年数据）及Gelman站点1,4-二氧六环污染——二氧六环污染羽流图（2023年数据）。 本数据已应用于Gelman站点1,4-二氧六环污染网页地图（详情见对应条目）。若您对Gelman Sciences, Inc污染场地有疑问，请联系Chris Svoboda，联系方式：517-256-2849 或 [e-mail]。若需报告数据问题或提出数据功能改进建议，请发送邮件至[e-mail]。