HM Pacific Northwest Inc. 5/18/2023

1 SECTION 9.16 SPRAY-COATING OPERATIONS Adopted 06/13/91 (700) Revised 07/08/99(886),07/12/01 (944) (a) Applicability. This section applies to spray-coating operations at facilities subject to Article 5 (Registration) or Article 7 (Operating Permits) of this regulation, where a coating that protects or beautifies a surface is applied with spray-coating equipment. (b) Exemptions. The following activities are exempt from the provisions of Sections 111 9.16(c) and (d) of this regulation. Persons claiming any of the following spray-coating exemptions shall have the burden of demonstrating compliance with the claimed exemption. I (1) Application of architectural or maintenance coatings to stationary structures (e.g., bridges, water towers, buildings, stationary machinery, or similar structures); I (2) Aerospace coating operations subject to 40 CFR Part 63, Subpart GG. This includes all activities and materials listed in 40 CFR 63.741(f); (3) Use of high-volume, low-pressure (HVLP) spray guns when: (A) spray-coating operations do not involve motor vehicles or motor vehicle components; I (B) the gun cup capacity is 8 fluid ounces or less; (C) the spray gun is used to spray-coat less than 9 square feet per day per facility; (D) coatings are purchased in containers of 1 quart or less; and (E) spray-coating is allowed by fire department, fire marshal, or other I government agency requirements. (4) Use of air-brush spray equipment with 0.5 to 2.0 CFM airflow and a maximum cup capacity of 2 fluid ounces; (5) Use of hand-held aerosol spray cans with a capacity of 1 quart or less; or (6) Indoor application of automotive undercoating materials using organic solvents having a flash point in excess of 100°F. (c) General Requirements for Indoor Spray-Coating Operations. It shall be unlawful for any person subject to the provisions of this section to cause or allow spray-coating inside a structure, or spray-coating of any motor vehicles or motor vehicle components, unless the spray-coating is conducted inside an enclosed spray area. The enclosed spray area shall employ either properly seated paint arresters, or water-wash curtains with a continuous water curtain to control the overspray.All emissions from the spray-coating operation shall be vented to the atmosphere through an unobstructed vertical exhaust vent. (d) General Requirements for Outdoor Spray-Coating Operations. It shall be unlawful for any person subject to the provisions of this section to cause or allow spray-coating outside an enclosed structure unless reasonable precautions are employed to minimize the overspray. Reasonable precautions include, but are not limited to the use of: I (1) Enclosures and curtailment during high winds; and (2) High-volume low-pressure (HVLP), low-volume low-pressure (LVLP), electrostatic, or air-assisted airless spray equipment. Airless spray equipment may be used where low viscosity and high solid coatings preclude the use of higher-transfer efficiency spray equipment. (e) Compliance with Other Regulations. Compliance with this regulation does not exempt any ■ person from compliance with Regulation I, Section 9.11 and all other applicable regulations including those of other agencies.