Figure 3. Graph showing depth below water table of environmental tritium concentrations in samples from selected wells, 1989–90 and 1996 studies, Chicot and Evangeline aquifers near Houston, Texas.

Figure 3.  Depth below water table of environmental tritium concentrations in samples from selected wells, 1989–90 and 1996 studies, Chicot and Evangeline aquifers near Houston, Texas.

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