1. Queens College and Graduate Center, City University of New York, 65-30 Kissena Boulevard, Flushing, New York 11367, Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, New York 10964, U.S. Geological Survey, Maine Water Science Center, 196 Whitten Road, Augusta, Maine 04330, and Maine Geological Survey, 22 State House Station, Augusta, Maine 04333