Unless specifically defined in the Texas Clean Air Act (TCAA) or in the rules of the Texas Natural Resource Conservation Commission (commission), the terms used by the commission have the meanings commonly ascribed to them in the field of air pollution control. In addition to the terms which are defined by the TCAA, the following terms, when used in this chapter, shall have the following meanings, unless the context clearly indicates otherwise.

1. (1) Extinguished--The absence of any visible flames, glowing coals, or smoke.
2. (2) Landclearing operation--The uprooting, cutting, or clearing of vegetation in connection with conversion for the construction of buildings, rights-of-way, residential, commercial, or industrial development, or the clearing of vegetation to enhance property value, access or production. It does not include the maintenance burning of on-site property wastes such as fallen limbs, branches, or leaves, or other wastes from routine property clean-up activities, nor does it include burning following clearing for ecological restoration.
3. (3) Practical alternative--An economically, technologically, ecologically and logistically viable option.
4. (4) Prescribed burn--The controlled application of fire to naturally-occurring vegetative fuels under specified environmental conditions and confined to a predetermined area, following appropriate planning and precautionary measures.
5. (5) Structure containing sensitive receptor(s)--A man-made structure utilized for human residence or business, the containment of livestock, or the housing of sensitive live vegetation. The term "man-made structure" does not include such things as range fences, roads, bridges, hunting blinds or facilities used solely for the storage of hay or other livestock feeds. The term "sensitive live vegetation" is defined as vegetation which has potential to be damaged by smoke and heat, examples of which include, but are not limited to: nursery production, mushroom cultivation, pharmaceutical plant production, or laboratory experiments involving plants.
6. (6) Sunrise/Sunset--Official sunrise/sunset as set forth in the United States Naval Observatory tables available from National Weather Service offices.
7. (7) Wildland--Uncultivated land other than fallow, land minimally influenced by human activity, and land maintained for biodiversity, wildlife forage production, protective plant cover, or wildlife habitat.

Source Note:The provisions of this §111.203 adopted to be effective September 16, 1996, 21 TexReg 8509.