Kira Harris¹, Amelia R Nelson², Audrey H Sawyer¹, Michael J Wilkins², Martin A Briggs³, John W Lane Jr⁴, Susa H Stonedahl⁵ and Kenneth Hurst Williams^6,7, (1)The Ohio State University, School of Earth Sciences, Columbus, OH, United States, (2)Colorado State University, Department of Soil and Crop Sciences, Fort Collins, CO, United States, (3)USGS Office of Groundwater, Hydrogeophysics Branch, Reston, VA, United States, (4)USGS, Hydrogeophysics Branch, Storrs, CT, United States, (5)St. Ambrose University, Engineering and Physical Science, Davenport, IA, United States, (6)Colorado School of Mines, Golden, CO, United States, (7)Lawrence Berkeley National Laboratory, Earth and Environmental Sciences, Berkeley, CA, United States