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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...
This dataset consists of digital scans of color infrared aerial photography from the Upper Mississippi River collected in 1975.
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Field spikes were prepared at 207 stream and river sites as part of the U.S. Geological Survey (USGS) National Water Quality Assessment (NAWQA) project between December, 2012, and September, 2015. At the field site, a depth-and width-integrated environmental sample was collected, and one subsample of the environmental sample was spiked with a known amount of a spike mixture. Both the spiked subsample ("spike sample") and another subsample ("environmental sample") of the original water sample were analyzed for pesticides at the USGS National Water Quality Laboratory (NWQL) by direct injection liquid chromatography with tandem mass spectrometry (LC-MS/MS), and were used to calculate the spike recovery of each analyte....
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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 USGS Combined Vector for Anderson Lake, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Alexandria East, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Elmer, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Emily, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Floodwood, Minnesota 20160601 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Flom, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Gillis Lake, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Glencoe, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Jasper, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lake Johanna, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lake Polly, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lake Miltona East, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lake Osakis East, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for McIntosh NE, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Montevideo, 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 Combined Vector for Anderson Lake, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Alexandria East, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Elmer, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Emily, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Floodwood, Minnesota 20160601 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Flom, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Gillis Lake, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Glencoe, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Jasper, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lake Johanna, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lake Polly, Minnesota 20160528 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lake Miltona East, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lake Osakis East, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for McIntosh NE, Minnesota 20160528 7.5 x 7.5 minute Shapefile USGS Combined Vector for Montevideo, 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 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