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Scientific Investigations Report 2010–5229

National Water-Quality Assessment Program

Estimates of Tracer-Based Piston-Flow Ages of Groundwater from Selected Sites: National Water-Quality Assessment Program, 1992–2005

By Stephen R. Hinkle, Stephanie D. Shapiro, L. Niel Plummer, Eurybiades Busenberg, Peggy K. Widman, Gerolamo C. Casile, and Julian E. Wayland

First posted January 27, 2011

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201

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