Zachary C Johnson¹, Martin A Briggs², Craig Snyder³ and Nathaniel P Hitt³, (1)University of Washington Seattle Campus, School of Environmental and Forest Sciences, Seattle, WA, United States, (2)USGS Office of Groundwater, Hydrogeophysics Branch, Reston, VA, United States, (3)USGS Leetown Science Center, Kearneysville, WV, United States