Grants of interest from the board are not required pursuant to these rules for the following:
(1) structures such as buoys, channel markers, beacons, duck blinds, and other similar structures, determined by the board to be minor;(2) activities exempted by other statutes.
31 Tex. Admin. Code § 155.7
The provisions of this §155.7 adopted to be effective January 1, 1976.