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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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This map layer includes Global Map data showing cities and towns in the United States, Puerto Rico, and the U.S. Virgin Islands. The data are a modified version of the National Atlas of the United States 1:1,000,000-scale cities and towns of the United States; those source data were derived from the Geographic Names Information System (GNIS) and the U.S. Census Bureau National Places Gazetteer files. Global Map refers to these locations as Built-up Area (point) and defines them as areas containing a concentration of buildings and other structures (smaller than Built-up Area (face)). National Atlas cities or towns are defined as places with a recorded population, usually with at least one central area that provides...
Types: Citation; Tags: Alabama, Alaska, Arizona, Arkansas, California, All tags...


map background search result map search result map USGS Small-scale Dataset - Global Map: Cities and Towns of the United States 201403 Shapefile 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 Topo Map Vector Data (Vector) 10745 Crisfield, Maryland 20170223 for 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Mine Run, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Narrows, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Garden Mountain, Virginia 20160713 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Haynesville, Virginia 20160713 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Kinsale, Virginia 20160713 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Luray, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Orlean, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Perkinsville, Virginia 20160714 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Templeton, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 47452 Wardensville, West Virginia 20170225 for 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Kempsville, Virginia 20160714 7.5 x 7.5 minute Shapefile USGS Combined Vector for Mouth of Wilson, Virginia 20160714 7.5 x 7.5 minute Shapefile USGS Combined Vector for Orange, Virginia 20160715 7.5 x 7.5 minute Shapefile USGS Combined Vector for Pulaski, Virginia 20160715 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Stephens City, Virginia 20160715 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 10745 Crisfield, Maryland 20170223 for 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Mine Run, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Narrows, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Garden Mountain, Virginia 20160713 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Haynesville, Virginia 20160713 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Kinsale, Virginia 20160713 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Luray, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Orlean, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Combined Vector for Perkinsville, Virginia 20160714 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Templeton, Virginia 20160713 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 47452 Wardensville, West Virginia 20170225 for 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Kempsville, Virginia 20160714 7.5 x 7.5 minute Shapefile USGS Combined Vector for Mouth of Wilson, Virginia 20160714 7.5 x 7.5 minute Shapefile USGS Combined Vector for Orange, Virginia 20160715 7.5 x 7.5 minute Shapefile USGS Combined Vector for Pulaski, Virginia 20160715 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Stephens City, Virginia 20160715 7.5 x 7.5 minute Shapefile USGS Small-scale Dataset - Global Map: Cities and Towns of the United States 201403 Shapefile 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