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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 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 Wolf Flat, UT 2017 USGS US Topo 7.5-minute map for Partoun, UT 2017 USGS US Topo 7.5-minute map for Scipio Lake, UT 2017 USGS US Topo 7.5-minute map for Smelter Knolls East, UT 2017 USGS US Topo 7.5-minute map for Lucin, UT 2017 USGS US Topo 7.5-minute map for North of Barro, UT 2017 USGS US Topo 7.5-minute map for North of Gold Hill Wash, UT 2017 USGS US Topo 7.5-minute map for Parker Knoll, UT 2017 USGS US Topo 7.5-minute map for Papoose Canyon, UT-CO 2017 USGS US Topo 7.5-minute map for Samaria, ID-UT 2017 USGS US Topo 7.5-minute map for Blacktail Mountain, UT 2017 USGS US Topo 7.5-minute map for Billies Mountain, UT 2017 USGS US Topo 7.5-minute map for Brighton, UT 2017 USGS US Topo 7.5-minute map for Heber Mountain, UT 2017 USGS Topo Map Vector Data (Vector) 15639 Flossie Knoll, Utah 20170516 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 25316 Leefe, Wyoming 20180210 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 25316 Leefe, Wyoming 20180210 for 7.5 x 7.5 minute Shapefile USGS US Topo 7.5-minute map for Wolf Flat, UT 2017 USGS US Topo 7.5-minute map for Partoun, UT 2017 USGS US Topo 7.5-minute map for Scipio Lake, UT 2017 USGS US Topo 7.5-minute map for Smelter Knolls East, UT 2017 USGS US Topo 7.5-minute map for Lucin, UT 2017 USGS US Topo 7.5-minute map for North of Barro, UT 2017 USGS US Topo 7.5-minute map for North of Gold Hill Wash, UT 2017 USGS US Topo 7.5-minute map for Parker Knoll, UT 2017 USGS US Topo 7.5-minute map for Papoose Canyon, UT-CO 2017 USGS US Topo 7.5-minute map for Samaria, ID-UT 2017 USGS US Topo 7.5-minute map for Blacktail Mountain, UT 2017 USGS US Topo 7.5-minute map for Billies Mountain, UT 2017 USGS US Topo 7.5-minute map for Brighton, UT 2017 USGS US Topo 7.5-minute map for Heber Mountain, UT 2017 USGS Topo Map Vector Data (Vector) 15639 Flossie Knoll, Utah 20170516 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 25316 Leefe, Wyoming 20180210 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 25316 Leefe, Wyoming 20180210 for 7.5 x 7.5 minute 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