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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.


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 Oyster Lake, CO 2016 USGS US Topo 7.5-minute map for Panorama Peak, CO 2016 USGS US Topo 7.5-minute map for Philadelphia Creek, CO 2016 USGS US Topo 7.5-minute map for Raton, NM-CO 2017 USGS US Topo 7.5-minute map for Papoose Canyon, UT-CO 2017 USGS Combined Vector for Carr West, Colorado 20160831 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lindon, Colorado 20160830 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lamb, Colorado 20160831 7.5 x 7.5 minute Shapefile USGS Combined Vector for Jefferson, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Midway SE, Colorado 20160903 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Pieplant, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for East Evacuation Creek, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Fall River Pass, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Hermit Lakes, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lusto Springs, Colorado 20160905 7.5 x 7.5 minute Shapefile USGS Combined Vector for Spruce Mountain, Colorado 20160905 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 40356 Scrivner Butte, Wyoming 20180210 for 7.5 x 7.5 minute FileGDB 10.1 USGS US Topo 7.5-minute map for Oyster Lake, CO 2016 USGS US Topo 7.5-minute map for Panorama Peak, CO 2016 USGS US Topo 7.5-minute map for Philadelphia Creek, CO 2016 USGS US Topo 7.5-minute map for Raton, NM-CO 2017 USGS US Topo 7.5-minute map for Papoose Canyon, UT-CO 2017 USGS Combined Vector for Carr West, Colorado 20160831 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lindon, Colorado 20160830 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Lamb, Colorado 20160831 7.5 x 7.5 minute Shapefile USGS Combined Vector for Jefferson, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Midway SE, Colorado 20160903 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Pieplant, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for East Evacuation Creek, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Fall River Pass, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Hermit Lakes, Colorado 20160904 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lusto Springs, Colorado 20160905 7.5 x 7.5 minute Shapefile USGS Combined Vector for Spruce Mountain, Colorado 20160905 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 40356 Scrivner Butte, Wyoming 20180210 for 7.5 x 7.5 minute FileGDB 10.1 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