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High radium (Ra) concentrations in potable portions of the Cambrian-Ordovician (C-O) aquifer system were investigated using water-quality data and environmental tracers ( 3H, 3Hetrit, SF6 , 14C and 4Herad) of groundwater age from 80 public-supply wells (PSWs). Groundwater ages were estimated by calibration of tracers to lumped parameter models and ranged from modern (1 Myr) in the most downgradient, confined portions of the potable system. More than 80 and 40 percent of mean groundwater ages were older than 1000 and 50,000 yr, respectively. Anoxic, Fe-reducing conditions and increased mineralization develop with time in the aquifer system and mobilize Ra into solution resulting in the frequent occurrence of combined...
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Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.
This dataset consists of digital scans of color infrared aerial photography from the Upper Mississippi River collected in 1975.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.
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Layers of geospatial data include contours, boundaries, land cover, hydrography, roads, transportation, geographic names, structures, and other selected map features.


map background search result map search result map USGS Small-scale Dataset - Congressional Districts of the United States - 110th Congress 200710 Shapefile USGS Small-scale Dataset - Congressional Districts of the United States - 112th Congress 201101 Shapefile 55_Wisconsin_Shape USGS US Topo 7.5-minute map for Black Hawk, WI 2015 USGS Combined Vector for Owen, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Bark Bay OE N, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Solon Springs, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for South Wayne, Wisconsin 20160516 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Arlington, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Albertville, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Cottage Grove, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Grandview NW, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 19563 Harvard, Illinois 20180625 for 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lehman Lake, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lime Ridge, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Moose Lake, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Newald, Wisconsin 20160516 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for La Crescent, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA: Table 3. Detailed information on calculations of environmental tracer data. USGS US Topo 7.5-minute map for Black Hawk, WI 2015 USGS Combined Vector for Owen, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Bark Bay OE N, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Solon Springs, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for South Wayne, Wisconsin 20160516 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Arlington, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Albertville, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Cottage Grove, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Grandview NW, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 19563 Harvard, Illinois 20180625 for 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lehman Lake, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lime Ridge, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Moose Lake, Wisconsin 20160516 7.5 x 7.5 minute Shapefile USGS Combined Vector for Newald, Wisconsin 20160516 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for La Crescent, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 55_Wisconsin_Shape Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA: Table 3. Detailed information on calculations of environmental tracer data. USGS Small-scale Dataset - Congressional Districts of the United States - 110th Congress 200710 Shapefile USGS Small-scale Dataset - Congressional Districts of the United States - 112th Congress 201101 Shapefile