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Exhibit 24

Major Upper East Texas Aquifers

The Upper East Texas region sits above two major aquifers: Carrizo-Wilcox and Trinity.

The Carrizo-Wilcox has two parts:

The outcrop is a portion of a water-bearing rock unit exposed at the land surface.

The subcrop is a portion of a water-bearing rock unit existing below other rock units.

For more information on this exhibit, please contact the Comptroller’s Data Services Division at 512-463-4900 or at P.O. Box 13528, Austin, Texas 78711-3528.

Source: Texas Water Development Board.

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