NR 440.74(4)(a)3.a.a. Measure the amount of coating applied at the coating applicator. This quantity shall be determined at a time and location in the process after all ingredients, including any dilution solvent, have been added to the coating or appropriate adjustments shall be made to account for any ingredients added after the amount of coating has been determined:
NR 440.74(4)(a)3.b.b. Determine the VOC content of all coatings applied using the test method specified in sub. (6) (a). This value shall be determined at a time and location in the process after all ingredients, including any dilution solvent, have been added to the coating or appropriate adjustments shall be made to account for any ingredients added after the VOC content in the coating has been determined;
NR 440.74(4)(a)3.c.c. Install, calibrate, maintain and operate, according to the manufacturer’s specifications, a device that indicates the cumulative amount of VOC recovered by the control device over each nominal 1-month period. The device shall be certified by the manufacturer to be accurate to within ±2.0%;
NR 440.74(4)(a)3.d.d. Measure the amount of VOC recovered; and
NR 440.74(4)(a)3.e.e. Calculate the overall VOC emission reduction (R) for each and every nominal 1-month period using Equation 5. Emissions during startups and shutdowns are to be included when determining R because startups and shutdowns are part of normal operation for this source category.
(Equation 5)
If the value of Ri is equal to or greater than 0.90, compliance with sub. (3) (b) 1. is demonstrated.
1) The value of RSi is zero unless the owner or operator submits the following information to the administrator for approval of a measured value of RSi, that is greater than zero but less than or equal to 6% by weight of the liquid VOC applied:
a) Measurement techniques; and
b) Documentation that the measured value of RSi, exceeds zero but is less than or equal to 6% by weight of the liquid VOC applied.
2) For those facilities not subject to subd. 3. e. 1), the value of RSi is zero unless the owner or operator submits the following information to the administrator for approval of a measured value of RSi that is greater than 6% by weight of the liquid VOC applied:
a) Measurement techniques;
b) Documentation that the measured value of RSi exceeds 6% by weight of the liquid VOC applied; and
c) Either documentation of customer specifications requiring higher values or documentation that the desired properties of the product make necessary for RSi to exceed 6% by weight of the liquid VOC applied and that such properties cannot be achieved by other means.
3) The measurement techniques of subd. 3. e. 1) a) and 2) a) shall be submitted to the department for approval.
NR 440.74(4)(a)3.f.f. The point at which Mr is to be measured shall be established when the compliance procedures are approved. The presumptive point of measurement shall be prior to separation/purification; a point after separation/purification may be adopted for enhanced convenience or accuracy.
NR 440.74(4)(a)4.4. Short-term liquid material balance. This method may be used as an alternative to the monthly liquid material balance described in subd. 3. The owner or operator using this method shall comply with the following procedures to determine VOC emission reduction for a 3 to 7 day period and shall continuously monitor VOC emissions as specified in sub. (5).
NR 440.74(4)(a)4.a.a. Use the procedures described in subd. 3. a. through f. to determine the overall emission reduction, R. Compliance is demonstrated if the value of R is equal to or greater than 0.90.
NR 440.74(4)(a)4.b.b. The number of days for the performance test is to be based on the affected facility’s representative performance consistent with the requirements of s. NR 440.08 (3). Data demonstrating that the chosen test period is representative shall be submitted to the department for approval.
NR 440.74(4)(b)(b) Each owner or operator of an affected coating operation subject to the standard specified in sub. (3) (b) 2. shall:
NR 440.74(4)(b)1.1. Demonstrate that a total enclosure is installed. The total enclosure shall either be approved by the department in accordance with the provisions of 40 CFR 60.746 or meet the requirements in subd. 1. a. to f. as follows:
NR 440.74(4)(b)1.a.a. The only openings in the enclosure are forced makeup air and exhaust ducts and natural draft openings such as those through which raw materials enter and exit the coating operation;
NR 440.74(4)(b)1.b.b. Total area of all natural draft openings does not exceed 5% of the total surface are of the total enclosure’s walls, floor and ceiling;
NR 440.74(4)(b)1.c.c. All access doors and windows are closed during normal operation of the enclosed coating operation, except for brief, occasional openings to accommodate process equipment adjustments. If openings are frequent or if the access door or window remains open for a significant amount of time during the process operation, it shall be considered a natural draft opening. Access doors used routinely by workers to enter and exit the enclosed area shall be equipped with automatic closure devices;
NR 440.74(4)(b)1.d.d. Average inward face velocity (FV) across all natural draft openings is a minimum of 3,600 meters per hour as determined by the following procedures:
1) 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
2) Determine FV by Equation 6:
(Equation 6)
NR 440.74(4)(b)1.e.e. The air passing through all natural draft openings flows into the enclosure continuously. If FV is less than or equal to 9,000 meters per hour, the continuous inward airflow shall be verified by continuous observation using smoke tubes, streamers, tracer gases or other means approved by the department over the period that the volumetric flow rate 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.