R307-306-2. Definitions

  The following additional definitions apply to R307-306.

  "Abrasive Blasting" means the operation of cleaning or preparing a surface by forcibly propelling a stream of abrasive material against the surface.

  "Abrasive Blasting Equipment" means any equipment used in abrasive blasting operations.

  "Abrasives" means any material used in abrasive blasting operations including but not limited to sand, slag, steel shot, garnet or walnut shells.

  "Confined Blasting" means any abrasive blasting conducted in an enclosure that significantly restricts air pollutants from being emitted to the ambient atmosphere, including but not limited to shrouds, tanks, drydocks, buildings and structures.

  "Hydroblasting" means any abrasive blasting using high pressure liquid as the propelling force.

  "Multiple Nozzles" means a group of two or more nozzles used for abrasive cleaning of the same surface in such close proximity that their separate plumes are indistinguishable.

  "Unconfined Blasting" means any abrasive blasting that is not confined blasting as defined above.

  "Wet Abrasive Blasting" means any abrasive blasting using compressed air as the propelling force and sufficient water to minimize the plume.