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.