USGS Scientific Investigations Report 2012–5141  - Estimates of Tracer-Based Piston-Flow Ages of Groundwater from Selected Sites: National Water-Quality Assessment Program, 2006

Scientific Investigations Report 2012–5141 

Estimates of Tracer-Based Piston-Flow Ages of Groundwater from Selected Sites: National Water-Quality Assessment Program, 2006–10 

Figure 1. Locations of National Water-Quality Assessment Program Study Units. (Study-Unit abbreviations are defined in table A1.)

First posted July 31, 2012

Report PDF (17 MB)

Table 1 XLS (166 kB)
Table A1 XLS (21 kB)
Appendix B PDF (16 MB)
Appendix B tables XLS ZIP (2.9 MB)

For additional information contact:
Chief, National Water-Quality Assessment (NAWQA) Program
U.S. Geological Survey
413 National Center
12201 Sunrise Valley Drive
Reston, VA 20192
http://water.usgs.gov/nawqa/

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