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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....


map background search result map search result map USGS Topo Map Vector Data (Vector) 15110 Featherville, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 15517 Flatiron Hill, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 17192 Gifford Spring, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 18041 Grangemont, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 22662 John Lewis Mountain, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 24568 Lake Mountain, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 25793 Linderman Dam, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 70704 Little Antelope Flat, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 25924 Little Blue Table, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 1591 Artillery Dome, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 2200 Balanced Rock, Idaho 20200716 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 18254 Grays Peak, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 21865 Indian Postoffice, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 29336 Miller Mountain East, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 30592 Mount George, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 37350 Red Ives Peak, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 32673 Nyssa, Oregon 20200713 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 36156 Posy Valley, Oregon 20200714 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 72538 Slide Mountain, Montana 20200722 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 15110 Featherville, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 15517 Flatiron Hill, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 17192 Gifford Spring, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 18041 Grangemont, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 22662 John Lewis Mountain, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 24568 Lake Mountain, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 25793 Linderman Dam, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 70704 Little Antelope Flat, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 25924 Little Blue Table, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 1591 Artillery Dome, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 2200 Balanced Rock, Idaho 20200716 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 18254 Grays Peak, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 21865 Indian Postoffice, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 29336 Miller Mountain East, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 30592 Mount George, Idaho 20200715 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 37350 Red Ives Peak, Idaho 20200715 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 32673 Nyssa, Oregon 20200713 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 36156 Posy Valley, Oregon 20200714 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 72538 Slide Mountain, Montana 20200722 for 7.5 x 7.5 minute Shapefile