1,720,970 research outputs found
Ground-water data management: The County Well Index
No full textWahl, T.E.; Tipping, R.G.. (1991). Ground-water data management: The County Well Index. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/59844
M-104 Bedrock geology and structure of the seven-county Twin Cities Metropolitan Area, Minnesota
No full textScale 1:125,000.Mossler, J.H.; Tipping, R.G.. (2000). M-104 Bedrock geology and structure of the seven-county Twin Cities Metropolitan Area, Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/57005
RI-61 Hydrogeology of the Paleozoic bedrock in southeastern Minnesota
No full textRunkel, A.C.; Tipping, R.G.; Alexander, E. Calvin, Jr.; Green, Jeffrey A.; Mossler, J.H.; Alexander, S.C.. (2003). RI-61 Hydrogeology of the Paleozoic bedrock in southeastern Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/58813
OFR 07-02; Geology in support of ground-water management for the Twin Cities Metropolitan Area, Metropolitan Council Water Supply Master Plan Development - Phase I
No full textThe supplementary GIS files contain metadata for the surficial geology map and Quaternary stratigraphy model, ESRI shape files associated with northwest metro area Quaternary stratigraphy model, ESRI grid files for northwest metro area Quaternary stratigraphy model, GIS files used to produce the surficial geology map, and images. Project Report has been split into three separate PDF files due to size.This report summarizes work by the Minnesota Geological Survey to provide the Metropolitan Council, as part of their Phase I Water Supply Master Plan, with information to help characterize recharge to metropolitan area bedrock aquifers. The Council requested a better understanding of the surface and subsurface distribution of unconsolidated deposits overlying bedrock, with the goal of identifying preferential water pathways from the land surface to bedrock. To this end, the Minnesota Geological Survey provided: 1.) a seamless surficial geology map of the greater Twin Cities metropolitan area; 2.) a collection of historic metro-wide water chemistry data used to prioritize areas for subsurface mapping – 27 new samples were collected in northwestern Hennepin County where data was sparse; and 3.) a three dimensional model of unconsolidated deposits from the land surface to bedrock for the northwest metropolitan area, hereafter referred to as the geologic framework model.Meyer, G.N.; Tipping, R.G.. (2007). OFR 07-02; Geology in support of ground-water management for the Twin Cities Metropolitan Area, Metropolitan Council Water Supply Master Plan Development - Phase I. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/108916
OFR91-05, Geologic factors affecting the sensitivity of the Prairie du Chien-Jordan aquifer
No full textGeologic factors affecting the pollution sensitivity of the Prairie du Chien-Jordan aquifer including overlying glacial drift, scale 1:853,000. Plate 1 is unavailable.Setterholm, D.R.; Runkel, A.C.; Cleland, J.M.; Tipping, R.G.; Mossler, J.H.; Kanivetsky, R.; Hobbs, H.C.. (1991). OFR91-05, Geologic factors affecting the sensitivity of the Prairie du Chien-Jordan aquifer. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/122055
OFR08-07, Washington County Landfill Logging Project: Borehole Geophysical Tests for Presence of Fracture Flow at a Perfluorochemical Contamination Site
No full textInformal report submitted as a contract deliverable.The Washington County Landfill located near Lake Elmo, Minnesota is a source of
perfluorochemicals that have contaminated groundwater in the area. A project completed in 2007 by the
Minnesota Geological Survey (Runkel and others, 2007) determined that flow through fractures is an
important part of the bedrock hydrogeologic system in an area of Lake Elmo one to two miles southwest
of the landfill. The objective of this project, sponsored by the Minnesota Pollution Control Agency
(MPCA) was to collect borehole geophysical data from three bedrock monitor wells within a few
hundred yards of the landfill (Fig. 1) in an effort to identify bedrock fractures and characterize their
hydraulic properties in the open-hole intervals of these wells. This information will allow the MPCA to
determine if there are preferential groundwater flow paths in the bedrock at the Washington County
Landfill, an important consideration for devising remediation and monitoring strategies at the site.Runkel, A.C.; Tipping, R.G.; Anderson, J.R.. (2008). OFR08-07, Washington County Landfill Logging Project: Borehole Geophysical Tests for Presence of Fracture Flow at a Perfluorochemical Contamination Site. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/109028
Mapping and hydrogeologic research in support of groundwater management, Shakopee Mdewakanton Sioux Community, Scott County, Minnesota
No full textPDF file contains the official report, GIS files containing digital maps and Arcview projects associated with the report, and the a text file that contains a general overview of GIS data data. Submitted as a contract deliverable in 2005.This report summarizes a project by the Minnesota Geological Survey (MGS) to conduct research intended to provide basic geologic data and technical interpretations pertinent to groundwater management strategies for the tribal land of the Shakopee-Mdewakanton Sioux Community (SMSC), and surrounding areas, in Scott County, Minnesota. The major project tasks included production of a number of maps, crosssections,
and 3-dimensional images that depict Paleozoic bedrock and overlying Quaternary strata. An evaluation of the hydrogeologic attributes of the bedrock is also included, with emphasis on the Franconia Formation and Ironton-Galesville sandstones which are of increasing importance to the SMSC as a source of water.Runkel, A.C.; Tipping, R.G.; Meyer, G.N.. (2008). Mapping and hydrogeologic research in support of groundwater management, Shakopee Mdewakanton Sioux Community, Scott County, Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/108352
OFR 07-05, The Lake Elmo Downhole Logging Project: Hydrostratigraphic Characterization of Fractured Bedrock at a Perfluorochemical Contamination Site
No full textThe Minnesota Pollution Control Agency (MPCA) and Minnesota Department of Health are
actively involved in detecting and remediating perfluorochemical contamination of groundwater in
the Twin Cities Metropolitan area. A perfluorochemical plume in the Lake Elmo area of
Washington County contaminated the water supply of more than 285 residents in that area. As a
result, a municipal water system has been connected to more than 200 residents, and domestic
wells in the area were abandoned. This report summarizes the results of a project by the Minnesota
Geological Survey to collect downhole geophysical data from nearly 200 of these domestic wells
before they were sealed as part of the abandonment process. Over 95 percent of these wells extract
water from the lower one-half of the St. Peter Sandstone or upper part of the Shakopee Formation, with the remaining wells open to overlying unconsolidated glacial deposits. The downhole
geophysical data are used to determine rock properties and flow characteristics of these bedrock
aquifers. The results will be used by the MPCA to help better determine the three dimensional
extent of contamination, and in particular provide insight into the role of groundwater flow through fractures. Such information will assist the MPCA in determining appropriate remedial monitoring actions in a cost effective manner.Runkel, A.C.; Mossler, J.H.; Tipping, R.G.. (2007). OFR 07-05, The Lake Elmo Downhole Logging Project: Hydrostratigraphic Characterization of Fractured Bedrock at a Perfluorochemical Contamination Site. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/109021
Geology in support of groundwater management for the northwestern Twin Cities Metropolitan area
No full textPDF file contains report, .zip file contains shapefiles, metadata, and grids, and .txt file contains overview of .zip file contents.The Paleozoic bedrock in the northwest part of the Twin Cities Metropolitan area
(Fig. 1) has been increasingly relied upon as a source of potable water. Most municipal
wells in the area are now constructed to draw water from Paleozoic bedrock because
productive drift aquifers are uncommon and are more susceptible to contamination.
Increased reliance on Paleozoic strata as a source of groundwater led to a request by
environmental managers, led by the Metropolitan Council, for improved geologic maps
of the area as well as a hydrogeologic characterization of the most heavily used aquifers
and their intervening confining units, those in the siliciclastic-dominated, Upper Cambrian
part of the Paleozoic section. Hydrogeologic characterization combined with mapping
provides a geologic framework for the northwest metro area that is of greater usefulness
to environmental managers because it will increase the accuracy of groundwater
protection plans, as well as predictions of aquifer productivity.
Our hydrogeologic investigation is focussed on detailed characterization of the
Upper Cambrian aquifer commonly referred to as the “Franconia-Ironton/Galesville” or
“FIG” aquifer, using recently developed borehole geophysical techniques (Paillet and
others 2000; Runkel and others, 2003). The tentative strategy for communities in the
northwest metro area is to use the FIG aquifer as the principle source of potable water.
Information was also collected and synthesized, to a lesser extent, on the Eau Claire and
St Lawrence Formations, which are generally considered confining units above and
below the FIG aquifer, and on the Mt Simon Sandstone, which is considered a less
desirable alternative to the FIG as a source of water.Runkel, A.C.; Tipping, R.G.; Mossler, J.H.. (2003). Geology in support of groundwater management for the northwestern Twin Cities Metropolitan area. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/108353
A Hydrogeologic and Mapping Investigation of the St. Lawrence Formation in the Twin Cities Metropolitan Area
No full textMinnesota Geological Survey (MGS) Open File Report 06-04 (pdf report) and Open
File Report 06-05 (ArcView apr and files for map and map pdf)This report summarizes the results of a two year project conducted by the Minnesota
Geological Survey to map the Upper Cambrian St. Lawrence Formation and investigate its
hydrologic properties in the Twin Cities Metropolitan area (TCMA). Funding was provided by
the Minnesota Department of Health. Final products are a map delivered in electronic format that
can be used with Arcview 3.2 GIS software, and this informal report.
Our hydrogeologic study indicates that the St. Lawrence Formation commonly has a
moderate to high horizontal hydraulic conductivity across all of the study area. In conditions of
shallow burial beneath younger bedrock it is most similar in the development of secondary pores
and measured hydraulic properties to fractured carbonate rock aquifers. Discrete intervals with
secondary pores have a high horizontal hydraulic conductivity whereas rock between these
intervals are orders of magnitude lower in conductivity.
The properties of the St. Lawrence Formation in a vertical direction are not as wellunderstood,
but available data are consistent with the traditional classification of the formation as
an aquitard. However, the integrity of the formation as an aquitard in a vertical direction,
particularly under conditions of shallow burial such as where it is uppermost bedrock, has not
been rigorously tested, and may be markedly variable across the TCMA. This is chiefly because
vertical fractures play an important role in determining aquitard integrity, and the distribution of
such fractures is poorly understood. Suggestions for additional research that might lead to a
better understanding of aquitard integrity are made at the end of this report.Runkel, A.C.; Mossler, J.H.; Tipping, R.G.; Bauer, E.J.. (2006). A Hydrogeologic and Mapping Investigation of the St. Lawrence Formation in the Twin Cities Metropolitan Area. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/108892
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