The key phrase is “Erosion Response Activity,” which is defined in the Texas Natural Resource Code, Chapter 33, Section 136 (f), as beach nourishment, sediment management, beneficial use of dredged material, construction of breakwaters, dune creation or enhancement, or revegetation. In essence, if you are doing any kind of project near the shoreline of a tidally influenced body of water you will need to file a Coastal Boundary Survey.