“…In previous reports (Barr and Davis, 2010;Barr, 2010Barr, , 2011Barr, , 2013Barr, , 2014Barr, , 2015Barr and Schneider, 2014;Barr and Heimann, 2016;Bartels, 2018, 2019), AWQMN sites have been classified based on several factors including the site type, dominant land use in the basin, past or present mining activity, and the physiographic province where the basin is located (table 1). Ten AWQMN sites (fig.…”