NR 440.644(2)(b)18. 18. Nb is the mass of VOC emitted per bead cemented for an affected facility for a month (grams (lb) per bead).

NR 440.644(2)(b)19. 19. Qa is the volumetric flow rate in vents after a control device (dry standard cubic meters (dry standard cubic feet) per hour).

NR 440.644(2)(b)20. 20. Qb is the volumetric flow rate in vents before a control device (dry standard cubic meters (dry standard cubic feet) per hour).

NR 440.644(2)(b)21. 21. Qr is the volumetric flow rate of each stream vented directly to the atmosphere from an affected facility or from a temporary enclosure around an affected facility (dry standard cubic meters (dry standard cubic feet) per hour).

NR 440.644(2)(b)22. 22. R is the overall efficiency of an emission reduction system (fraction).

NR 440.644(2)(b)23. 23. Td is the total number of days in monthly compliance period (days).

NR 440.644(2)(b)24. 24. To is the total number of tires cemented or sprayed with water-based green tire sprays at a particular affected facility for a month.

NR 440.644(2)(b)25. 25. Wo is the weight fraction of VOC in a cement or spray material.

NR 440.644(3) (3) Standards for volatile organic compounds.

NR 440.644(3)(a) (a) General. On and after the date on which the initial performance test, required by s. NR 440.08, is completed, but no later than 180 days after initial startup, each owner or operator subject to the provisions of this section shall comply with the following conditions:

NR 440.644(3)(a)1. 1. For each undertread cementing operation:

NR 440.644(3)(a)1.a. a. Discharge into the atmosphere no more than 25% of the VOC used (75% emission reduction) for each month; or

NR 440.644(3)(a)1.b. b. Maintain total (uncontrolled) VOC use less than or equal to the following levels, depending upon the duration of the compliance period:

1) 3,870 kg (8,531 lb) of VOC per 28 days.

2) 4,010 kg (8,846 lb) of VOC per 29 days.

3) 4,150 kg (9,149 lb) of VOC per 30 days.

4) 4,280 kg (9,436 lb) of VOC per 31 days.

5) 4,840 kg (10,670 lb) of VOC per 35 days.

NR 440.644(3)(a)2. 2. For each sidewall cementing operation:

NR 440.644(3)(a)2.a. a. Discharge into the atmosphere no more than 25% of the VOC used (75% emission reduction) for each month; or

NR 440.644(3)(a)2.b. b. Maintain total (uncontrolled) VOC use less than or equal to the following levels, depending upon the duration of the compliance period:

1) 3,220 kg (7,099 lb) of VOC per 28 days.

2) 3,340 kg (7,363 lb) of VOC per 29 days.

3) 3,450 kg (7,606 lb) of VOC per 30 days.

4) 3,570 kg (7,870 lb) of VOC per 31 days.

5) 4,030 kg (8,885 lb) of VOC per 35 days.

NR 440.644(3)(a)3. 3. For each tread end cementing operation: Discharge into the atmosphere no more than 10 grams (0.022 lb) of VOC per tire cementing for each month.

NR 440.644(3)(a)4. 4. For each bead cementing operation: Discharge into the atmosphere no more than 5 grams (0.011 lb) of VOC per bead cemented for each month.

NR 440.644(3)(a)5. 5. For each green tire spraying operation where only water-based sprays are used, do both of the following: