1 Office of Groundwater, Branch of Geophysics, U.S. Geological Survey, Storrs, CT 06269.
2 Department of Earth & Environmental Sciences, Rutgers University Newark, Newark, NJ 07102.
3 New York Water Science Center, U.S. Geological Survey, Troy, NY 12180.
4 Environmental Sciences Division, Characterization and Monitoring Branch, U.S. Environmental Protection Agency, Office of Research and Development, Las Vegas, NV 89119.