Fred Baldassare, P.G.¹, Mark McCaffrey, Ph.D² and John Harper, Ph.D³, (1)Echelon Applied Geoscience Consulting, Murrysville, PA, (2)Geosciences, Weatherford Laboratories, Dallas, TX, (3)Natural History, Carnegie Museum of Natural History, Pittsburgh, PA

Christine Rivard, Geological Survey of Canada, Quebec, QC, Canada

Greg Lackey¹, Harihar Rajaram², Owen Sherwood², Troy Burke¹ and Joseph Ryan³, (1)Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, Boulder, CO, (2)Institute of Arctic and Alpine Research, Boulder, CO, (3)Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Boulder, CO

Peter B. McMahon, Ph.D.¹, Jeannie Barlow, PhD², Mark A. Engle, Ph.D.³, Kenneth Belitz⁴, Patricia Ging⁵, Andrew Hunt⁶, Yousif Kharaka⁷, Bryant C. Jurgens⁸, Roland Tollett⁹ and Timothy Kresse¹⁰, (1)USGS, Denver, CO, (2)Lower Mississippi-Gulf Water Science Center, U.S. Geological Survey, Jackson, MS, (3)Eastern Energy Resources Science Center, USGS, Reston, VA, (4)National Water Quality Assessment Program, U.S. Geological Survey, Boston, MA, (5)U.S. Geological Survey, Austin, TX, (6)U.S. Geological Survey, Denver, CO, (7)U.S. Geological Survey, Menlo Park, CA, (8)U.S. Geological Survey, California Water Science Center, Sacramento, CA, (9)U.S. Geological Survey, Ruston, LA, (10)U.S. Geological Survey, Little Rock, AR

Tom Tomastik, P.G.¹, J. Daniel Arthur, PE², Will Green, P.G.³ and Jeff Kennedy⁴, (1)ALL Consulting, Columbus, OH, (2)ALL Consulting, LLC, Tulsa, OK, (3)ALL Consulting, Cadiz, OH, (4)ALL Consulting, Tulsa, OK

Beth Parker, PhD, University of Guelph, College of Physical and Engineering Science, G360 Institute for Groundwater Research, Guelph, Ontario, ON, Canada