Geologic Investigation for Portion of the Twin Cities Metropolitan Area: Quaternary/Bedrock Hydraulic Conductivity and Groundwater Chemistry
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Geologic Investigation for Portion of the Twin Cities Metropolitan Area: Quaternary/Bedrock Hydraulic Conductivity and Groundwater Chemistry
Published Date
2010-11-24
Publisher
Minnesota Geological Survey
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Dataset
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Abstract
This report summarizes work performed by the Minnesota Geological Survey (MGS) in
partial fulfillment of work as described under contract 091037 between the University of
Minnesota and the Metropolitan Council. The goal of this investigation was to provide datasets
that would assist the Metropolitan Council with regional ground water planning. Specifically,
hydraulic conductivity data for both unconsolidated and bedrock materials, along with historic
ground water chemical and isotopic data were assembled into spatial databases that can be used
in a geographic information systems (GIS) format. Wherever possible, depth of the sampled or
tested material was included along with location information, so the three-dimensional
distribution of these data could be queried and compared to ongoing Metropolitan Council
planning projects. For hydraulic conductivity data, the focus was on glacial-related Quaternary
deposits, because these are the data most lacking for current ground-water modeling
investigations. Hydrostratigraphic attributes of fine-grained materials were evaluated based on a
comparison of measured values with texture, depth, and a literature review of other midcontinent
tills. For water chemistry, the goal was to display the distribution of chemical types
(hydrochemical facies) as a means to illustrate possible ground-water flowpaths. A sample
acquisition date was included so the database could also be used to assess changes in chemical
composition with time. For both hydraulic conductivity data and water chemistry, attributes
were also assigned to a regional dataset of regularly spaced grid points to facilitate importing the
data into groundwater modeling programs.
The individual point data geodatabase (PointData.mdb) provides access to hydraulic
conductivity and chemical data for a specific site. Because much of the site information on
geologic setting comes from different consultant's reports, there is a lack of consistency in
lithologic and stratigraphic attributes. In this way, PointData.mdb is best suited as a "what's in
my neighborhood" type of dataset rather than for rigorous regional spatial analysis of hydraulic
conductivity data. The grid design of regional summary data geodatabase (RegionalData.gdb) is
meant to provide the means to readily import and adjust hydraulic conductivity and chemical
data in ground water flow models, or for use as an additional layer for three-dimensional
evaluation of model results. Use of regional summary data in these settings can aid in refining
conceptual models of ground-water flow.
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Description
Informal report submitted as deliverable for contract between University of Minnesota and the Metropolitan Council
for project entitled "Geologic Investigation for portions of the Twin Cities Metropolitan Area: I. Quaternary/Bedrock
Hydrostratigraphy, II. Hydrochemical Facies." This informal report has not been edited for scientific content.
Results should be considered preliminary and subject to change.
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Produced for, and funded by, the Metropolitan Council.
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Tipping, Robert G; Runkel, Anthony C; Gonzalez, Christopher M. (2010). Geologic Investigation for Portion of the Twin Cities Metropolitan Area: Quaternary/Bedrock Hydraulic Conductivity and Groundwater Chemistry. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/263032.
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