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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...


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 US Topo 7.5-minute map for Bridgewater, MI 2017 USGS US Topo 7.5-minute map for Edmore, MI 2017 USGS US Topo 7.5-minute map for Estey, MI 2017 USGS US Topo 7.5-minute map for Maywood, MI 2017 USGS US Topo 7.5-minute map for Holland East, MI 2017 USGS Topo Map Vector Data (Vector) 29041 Michigamme, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 72318 Clare, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 12262 Diffin, Michigan 20170312 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 76310 Grosse Pointe OE E, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 76314 Hiram Point OE S, Michigan 20170312 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 20179 Herman, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 20255 Hetherton, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 23095 Kawkawlin, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 24750 Lakeview, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 72561 Traverse City SW, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 47899 Webberville, Michigan 20170312 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 46333 Union City, Michigan 20170314 for 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 Bridgewater, MI 2017 USGS US Topo 7.5-minute map for Edmore, MI 2017 USGS US Topo 7.5-minute map for Estey, MI 2017 USGS US Topo 7.5-minute map for Maywood, MI 2017 USGS US Topo 7.5-minute map for Holland East, MI 2017 USGS Topo Map Vector Data (Vector) 29041 Michigamme, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 72318 Clare, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 12262 Diffin, Michigan 20170312 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 76310 Grosse Pointe OE E, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 76314 Hiram Point OE S, Michigan 20170312 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 20179 Herman, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 20255 Hetherton, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 23095 Kawkawlin, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 24750 Lakeview, Michigan 20170328 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 72561 Traverse City SW, Michigan 20170329 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 47899 Webberville, Michigan 20170312 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 46333 Union City, Michigan 20170314 for 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