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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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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 Louisville West, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for North Pleasureville, Kentucky 20160527 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Piqua, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Saint Catharine, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Tonieville, Kentucky 20160527 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Dycusburg, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Falls of Rough, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Galen, Tennessee 20160601 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Hickman, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lanesville, Indiana 20160712 7.5 x 7.5 minute Shapefile USGS Combined Vector for Levee, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Louisa, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Olney, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Palmer, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Perryville, Kentucky 20160527 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Woodstock, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Stricklett, Kentucky 20160527 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Louisville West, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for North Pleasureville, Kentucky 20160527 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Piqua, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Saint Catharine, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Tonieville, Kentucky 20160527 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Dycusburg, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Falls of Rough, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Galen, Tennessee 20160601 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Hickman, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Lanesville, Indiana 20160712 7.5 x 7.5 minute Shapefile USGS Combined Vector for Levee, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Louisa, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Olney, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Palmer, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Perryville, Kentucky 20160527 7.5 x 7.5 minute FileGDB 10.1 USGS Combined Vector for Woodstock, Kentucky 20160527 7.5 x 7.5 minute Shapefile USGS Combined Vector for Stricklett, Kentucky 20160527 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