“…In particular, variables affecting fate and transport of contaminants or related to stream ecological condition were considered at the stream segment (Omernik, 1987; U.S. Environmental Protection Agency and the U.S. Geological Survey, 2005Survey, , 2012Gronberg, 2012;McKay and others, 2012;and U.S. Environmental Protection Agency, 2013), riparian reach (Kuchler, 1964;Homer and others, 2015), and watershed (U.S. Department of Agriculture, 1995; U.S. Department of Agriculture National Agricultural Statistics Service, 2014; Wolock, 1997Wolock, , 2003Nakagaki and others, 2007;Maupin and Ivahnenko, 2011;Nakagaki and others, 2012; U.S. Environmental Protection Agency and the U.S. Geological Survey, 2012;Prism Climate Group, 2013;Robertson and Saad, 2013;Nowell and others, 2014;Baker and Stone, 2015;and Homer and others, 2015) scales. The "Selection of Random Sites" and "Selection of Targeted Sites" sections describe the methods used to achieve the dualagency (USGS MSQA and EPA NRSA) goals.…”