This report summarizes the contributions of the Minnesota Geological Survey (MGS) to a three-year study conducted in two phases – Environmental and Natural Resources Trust Fund (ENRTF), M.L. 2014, Chp. 226, Sec. 2, Subd. 03h, and ENTRF, M.L. 2016, Chp. 186, Sec. 2, Subd. 04h, led by the United States Geological Survey (USGS) Minnesota Water Science Center, which seeks to further knowledge on the sources and rates of recharge to confined aquifers set within buried-valley sequences in Minnesota. Six cores (including one collected for a previous study) of unconsolidated Quaternary deposits were extracted from known confined glacial aquifer settings, in four regions across Minnesota, in order to target variability in the material properties of the aquitards that confine them.
This knowledge enables policy makers and planners to support water resource management by further clarifying the hydrologic properties of tills that govern both recharge to and protection of the underlying confined glacial aquifers that provide drinking water for many Minnesotans. Geologic cores from sites in Litchfield (LF01, LF02), Cromwell (CW02), and Olivia (MN OB-7), Minnesota, and the University of Minnesota Hydrogeology field site (HB1-15, HT-200) (UM field site) near Akeley, Minnesota, were described both in the field and in the laboratory, and characterized using conventional sediment processing and analysis techniques. All cores are archived at the Minnesota Department of Natural Resources core repository in Hibbing, Minnesota, with the exception of core HT-200, which was described and disposed of in the field. Borehole geophysical logs were collected for all drill holes of adequate diameter, including gamma, electromagnetic induction, and spontaneous potential and resistivity logs.
US Geological Survey; Funded through the Environment and Natural Resources Trust Fund as recommended by the Legislative and Citizens Commission on Minnesota Resources (LCCMR)
Staley, Amie E; Wagner, Kaleb; Nguyen, Maurice; Tipping, Robert.
OFR18-03, Core Descriptions, Borehole Geophysics, and Unit Interpretations in Support of Phase I and II USGS Hydrologic Properties of Till Investigation.
Minnesota Geological Survey.
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