NR 440.71(4)(b)5.5. An alternative method of demonstrating compliance with sub. (3) (b) or (d), standards for coating operations, and the sole method of demonstrating compliance with sub. (3) (c) 4., standards for modified or reconstructed coating operations, is the installation of a total enclosure around the coating operation and the ventilation of all VOC emissions from the total enclosure to a control device with the efficiency specified in par. (b) 5. c. 1) or 2), as applicable. If this method is selected, the compliance test methods described in par. (b) 1. to 4. are not required. Instead, each owner or operator of an affected coating operation shall:

NR 440.71(4)(b)5.a.a. Demonstrate that a total enclosure is installed. An enclosure that meets the requirements in subd. 5. a. 1) to 4) shall be assumed to be a total enclosure. The owner or operator of an enclosed coating operation that does not meet the requirements may apply to the administrator for approval of the enclosure as a total enclosure on a case-by-case basis. The enclosure shall be considered a total enclosure if it is demonstrated to the satisfaction of the administrator that all VOC emissions from the affected coating operation are contained and vented to the control device. The requirements for automatic approval are as follows:

1) Total area of all natural draft openings may not exceed 5% of the total surface area of the total enclosure’s walls, floor and ceiling;

3) Average inward face velocity across all natural draft openings (FV) shall be a minimum of 3,600 meters per hour as determined by the following procedures:

a) Construct all forced makeup air ducts and all exhaust ducts so that the volumetric flow rate in each can be accurately determined by the test methods and procedures specified in sub. (6) (c) and (d). Volumetric flow rates shall be calculated without the adjustment normally made for moisture content; and

4) The air passing through all natural draft openings shall flow into the enclosure continuously. If FV is less than or equal to 9,000 meters per hour, the continuous inward flow of air shall be verified by continuous observation using smoke tubes, streamers, tracer gases or other means approved by the administrator over the period that the volumetric flow tests required to determine FV are carried out. If FV is greater than 9,000 meters per hour, the direction of airflow through the natural draft openings shall be presumed to be inward at all times without verification.

NR 440.71(4)(b)5.b.b. Determine the control device efficiency using Equation (2) or Equations (4) and (5), as applicable and the test methods and procedures specified in sub. (6) (b) to (g).

NR 440.71(4)(b)5.c.c. Compliance is demonstrated if the installation of a total enclosure is demonstrated and the value of E determined from Equation (2), or the value of Hsys determined from Equations (4) and (5), as applicable, is equal to or greater than the required efficiency as follows:

2) For coating operations subject to the standards of sub. (3) (c) 4. a., the value of E determined from Equation (2), or the value of Hsys determined from Equations (4) and (5), as applicable, pursuant to par. (a) 2. prior to modification or reconstruction or 0.95 (95%), whichever is lower.

NR 440.71(4)(b)6.6. To demonstrate compliance with sub. (3) (e) (standard for new mix equipment with concurrent construction of a control device), each owner or operator of affected coating mix preparation equipment shall demonstrate upon inspection that:

NR 440.71(4)(b)6.b.b. Procedures detailing the proper use of covers, as specified in sub. (3) (c) 1., have been posted in all areas where affected coating mix preparation equipment is used;

NR 440.71(4)(b)6.d.d. The control device efficiency (E or Hsys, as applicable) determined using Equation (2) or Equations (4) and (5), respectively and the test methods and procedures specified in sub. (6) (b) to (g) is equal to or greater than 0.95.

NR 440.71(4)(b)7.7. To demonstrate compliance with sub. (3) (f) 1., standard for mix equipment, each owner or operator of affected coating mix preparation equipment shall demonstrate upon inspection that:

NR 440.71(4)(b)7.b.b. Procedures detailing the proper use of covers, as specified in sub. (3) (c) 1., have been posted in all areas where affected coating mix preparation equipment is used; and

NR 440.71(4)(b)8.8. To demonstrate compliance with sub. (3) (f) 2., standard for mix equipment, each owner or operator of affected coating mix preparation equipment shall demonstrate upon inspection that both:

NR 440.71(4)(b)8.a.a. Covers satisfying the requirements of sub. (3) (e) 1. to 5. have been installed and are being used properly; and

NR 440.71(4)(b)8.b.b. Procedures detailing the proper use of covers, as specified in sub. (3) (c) 1., have been posted in all areas where affected coating mix preparation equipment is used.

NR 440.71(4)(b)9.9. To determine compliance with sub. (3) (g), high-solids coatings alternative standard, each owner or operator of an affected facility shall determine the weighted average mass of VOC contained in the coating per volume of coating solids applied for each and every nominal 1-month period according to the following procedures: