Browsing by Subject "water chemistry"

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    Groundwater chemistry data, real-time temperature, elevation, and specific conductance for MN Wells 668848 and 668849 (May 2021 - May 2024)
    (2024-05-07) McDaris, John; Feinberg, Joshua; Wiest, Nicholas; mcda0030@umn.edu; McDaris, John; University of Minnesota Department of Earth and Environmental Sciences
    Full water chemistry analysis data from two wells (668848, 668849) adjacent to Williamson Hall on the East Bank Campus of the University of Minnesota, Twin Cities. Water samples were taken ~quarterly in conjunction with a PhD project led by McDaris. Feinberg and Wiest assisted in sample collection and interpretation. The wells were also instrumented with in situ sensors measuring groundwater temperature, elevation, and specific conductance. Measurements from these sensors were taken multiple times per hour for three years.
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    Nitrate Concentration in Streams as Related to Major Ion Chemistry
    (2016-05) Gao, Yuan
    Nitrate (NO3-) is a reactive nitrogen compound and can be utilized by living organisms. Industrial nitrogen fixation methods have greatly increased the production of reactive nitrogen and ultimately increased concentration of nitrate in natural waters. In natural streams, nitrate is recognized as a pollutant that can lead to some serious health issue for humans. Therefore, knowing the nitrate concentration in streams is critical to the environment and human health. Nitrate is not a major ion in natural waters. It would be very helpful if nitrate concentration could be estimated from other frequently measured parameters of stream, allowing ones to predict the nitrate concentration from other, more easily measure parameters. The largest data set of ionic composition of streams that has ever been compiled was used to examine the relationships among nitrate concentrations, major ion concentrations, and two bulk measurements of ionic content, ionic strength and specific conductance.
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    OFR14-04, Hydrogeologic Properties of the St. Lawrence Aquitard, Southeastern Minnesota
    (Minnesota Geological Survey, 2014) Runkel, Anthony C.; Tipping, Robert R.; Green, J.A.; Jones, Perry M.; Meyer, Jessica R.; Parker, Beth L.; Steenberg, Julia R.; Retzler, Andrew J.
    To better understand the properties of bedrock aquitards, we initiated a project that utilizes widely ranging methods to gain insights into the properties of the St Lawrence Formation and adjacent strata of the upper Tunnel City Group (Mazomanie and Lone Rock Formations) and lower Jordan Sandstone. The St Lawrence Formation has been traditionally regarded as an aquitard in the Paleozoic bedrock hydrogeologic system.Our investigation addresses hydraulic properties at site-specific as well as sub-regional (square miles) scales. Specific activities included drilling, testing and instrumentation of a borehole in the eastern Twin Cities Metro area (TCMA), the Afton multilevel system (MLS) hole, that has provided us with detailed multi-level measurements of hydraulic characteristics above, below and within the St. Lawrence Formation. We also analyzed the distribution of fractures in bedrock outcrops, in an effort to understand the controls these fractures might have on borehole hydraulic conditions. Borehole and outcrop scale data are augmented with ground-water tracer experiments that provide horizontal and vertical travel times at the sub-regional scale. Compilation of existing published and unpublished hydraulic and water chemistry data provide additional insights into the properties of the St Lawrence Formation and adjacent units across a wider extent of southeastern Minnesota.