CASTRO, M. Clara, HALL, Chris M., WARRIER, Rohit B., and LOHMANN, Kyger C., Earth and Environmental Sciences, University of Michigan, 2534 C.C. Little Building, 1100 N. University Ave, Ann Arbor, MI 48109, mccastro@umich.edu

AMOS, Richard T., Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave W, Waterloo, ON N2L 3G1 Canada, ramos@uwaterloo.ca

JONES, Katherine L.¹, LINDSAY, Matthew B.J.², KIPFER, Rolf³, and MAYER, K. Ulrich¹, (1) Earth, Ocean and Atmospheric Sciences, University of British Columbia, 6339 Stores Rd, Vancouver, BC V6T1Z4, Canada, umayer@eos.ubc.ca, (2) Geological Sciences, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada, (3) Eawag, Swiss Federal Institute of Aquatic Science and Technology, Duebendorf, CH-8600, Switzerland

GATES, John B., Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, 217 Bessey Hall, Lincoln, NE 68502, jgates2@unl.edu

SANFORD, Ward E.¹, HAASE, Karl B.², and BUSENBURG, Eurybaides², (1) U.S. Geological Survey, Mail Stop 431, 12201 Sunrise Valley Drive, Reston, VA 20192, wsanford@usgs.gov, (2) US Geological Survey, Mail Stop 432, 12201 Sunrise Valley Drive, Reston, VA 20192

LAND, Lewis A., NM Bureau of Geology and Mineral Resources and National Cave & Karst Research Institute, New Mexico Tech, 400-1 Cascades Ave, Carlsbad, NM 88220, lland@gis.nmt.edu and TIMMONS, Stacy S., New Mexico Bureau of Geology & Mineral Resources, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801

MCCALLUM, James, School of the Environemt, National Centre for Groundwater Research and Training, Flinders University, GPO Box 2100, Adelaide, 5001, Australia, mcca0206@flinders.edu.au, COOK, Peter G., National Centre for Groundwater Research and Training/CSIRO Land and Water, Flinders University, Ring Road, Bedford Park, 5042, Australia, SIMMONS, Craig T., School of the Environment & National Centre for Groundwater Research and Training, Flinders University, GPO Box 2100, Adelaide, 5001, Australia, and WERNER, Adrian D., National Centre for Groundwater Research and Training, Flinders University, GPO Box 2100, Adelaide, 5000, Australia

HASSANIZADEH, S. Majid, Earth Sciences, Utrecht University, Budapestlaan 4, Utrecht 3584CD Netherlands, S.M.Hassanizadeh@uu.nl

SHARMA, Shikha¹, MULDER, Michon L.², SACK, Andrea², BOWMAN, Lindsey², CARR, Timothy², SCHROEDER, Karl³, HAMMACK, Richard W.³, WHITE, Jeremy S.⁴, and CHAMBERS, Douglas B.⁴, (1) Department of Geology & Geography, West Virginia University, Morgantown, WV 26506, shikha.sharma@mail.wvu.edu, (2) Department of Geology and Geography, West Virginia University, 330 Brooks Hall, Morgantown, WV 26506, (3) National Energy Technology Laboratory, U.S. Department of Energy, Pittsburgh, PA 15236, (4) US Geological Survey, WV Water Science Center, 11 Dunbar Street, Charleston, WV 25301

POLLOCK, Erik D., University of Arkansas Stable Isotope Laboratory, University of Arkansas, 116 Ferritor Hall, Fayetteville, AR 72701, epolloc@uark.edu

MITCHELL, Evelynn J.¹, PATRICK, Edward L.², MANDT, Kathleen E.², MITCHELL, Joseph N.³, and WILLIAMS, Gregg C.³, (1) Physics and Earth Sciences, St. Mary's University, One Camino Santa Maria, San Antonio, TX 78228, emitchell1@stmarytx.edu, (2) Space Science and Engineering, Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78238, (3) Applied Physics, Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78238