David Rey, Colorado School of Mines, Golden, CO, United States, Michelle A Walvoord, USGS Water Cycle Branch, Earth System Processes Division, Lakewood, CO, United States, Burke J Minsley, USGS Geology, Geophysics, and Geochemistry Science Center, Denver, CO, United States, Brian A Ebel, Univ of Colorado, Boulder, CO, United States, Cliff Voss, USGS, Earth System Processes Division, Menlo Park, CA, United States and Kamini Singha, Colorado School of Mines, Department of Geology and Geological Engineering, Golden, United States