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Fig. 2. Soil water ${delta}$ ¹⁸O values with depth in the Hanford vadose zone. Pore waters in the upper 2 m are most strongly affected by evaporation (Fig. 2) and have ${delta}$ ¹⁸O values up to –3.8 ${per thousand}$ . Below the evaporation zone, soil water ${delta}$ ¹⁸O values are shifted by approximately +2 ${per thousand}$ (dashed line) higher than typical winter precipitation (–16.5 ${per thousand}$ ). Pore water stable isotope data from DePaolo et al. (2004) and unpublished data from ongoing studies are shown as blue diamonds.