The following words and terms, when used in this undesignated head, shall have the following meanings, unless the context clearly indicates otherwise.
  (1) Abrasive blasting--The operation of cleaning or preparing a surface by forcibly propelling a stream of abrasive material against the surface.
  (2) Hydroblasting--Any abrasive blasting using high pressure liquid as the propelling force or as the active cleaning agent.
  (3) Private residence--A residence not occupied or used solely by the owner of the property upon which the water storage tank to be blasted is located.
  (4) Public area--An outdoor area where it may be reasonably anticipated that the public could congregate for more than short-term periods, including, but not limited to, schools, day care centers, convalescent centers, parks, and recreation areas.
  (5) Shroud--A device which is designed to enclose or surround the area being blasted to minimize the atmospheric entrainment of fine particulates and direct that material to a confined area for disposal. The shroud shall have overlapping seams to prevent leakage of particulates, shall extend a minimum of 15 feet above the area being blasted, and shall have a shade factor of 95% or a control factor of 95% of particles 100 grit or greater. A shade factor is defined as the percent of area impermeable to particles or sunlight.
  (6) Vacuum blasting--Any abrasive blasting in which the spent abrasive, surface material, and dust resulting from blasting are immediately collected by a vacuum device, equipped with a high efficiency particulate filter.
  (7) Water storage tank--Any above-ground vessel designed and constructed for the purpose of storing potable water.
  (8) Wet abrasive blasting--Any abrasive blasting using compressed air as the propelling force, which mixes with water to minimize emissions.

Source Note: The provisions of this §111.131 adopted to be effective November 1, 1991, 16 TexReg 5833.