Jay P Zarnetske, Michigan State University, East Lansing, MI, United States, Sinchan Roy Chowdhury, Michigan State University, Department of Earth and Environmental Sciences, East Lansing, MI, United States, Mantha S Phanikumar, Michigan State Univ, East Lansing, MI, United States, Martin A Briggs, USGS Office of Groundwater, Hydrogeophysics Branch, Reston, VA, United States, Frederick David Day-Lewis, USGS Office of Groundwater, Branch of Geophysics, Storrs, CT, United States and Kamini Singha, Colorado School of Mines, Department of Geology and Geological Engineering, Golden, United States