NR 440.62(4)(b)2.c.c. After 5 consecutive quarterly leak detection periods with the percent of valves leaking equal to or less than 2.0 an owner or operator may begin to skip 3 of the quarterly leak detection periods for the valves in gas/vapor and light liquid service.

NR 440.62(4)(b)2.d.d. If the percent of valves leaking is greater than 2.0 the owner or operator shall comply with the requirements as described in sub. (3) (g) but can again elect to use this subsection.

NR 440.62(4)(b)2.e.e. The percent of valves leaking shall be determined by dividing the sum of valves found leaking during current monitoring and valves for which repair has been delayed by the total number of valves subject to the requirements of this paragraph.

NR 440.62 NoteNote: Under 40 CFR 60.484, each owner or operator subject to the provisions of this section may apply to the administrator for determination of equivalence for any means of emission limitation that achieves a reduction in emissions of VOC at least equivalent to the reduction in emissions of VOC achieved by the controls required in this section. Manufacturers of equipment used to control equipment leaks of VOC may apply to the administrator for determination of equivalence for any equivalent means of emission limitation that achieves a reduction in emissions of VOC at least equivalent to the reduction in emissions of VOC achieved by the equipment, design and operational requirements of this section. The administrator will make an equivalence determination according to the provisions of 40 CFR 60.484 (b), (c), (d) and (e).

NR 440.62(6)(a)(a) In conducting the performance tests required in s. NR 440.08, the owner or operator shall use as reference methods and procedures the test methods in Appendix A of 40 CFR part 60, incorporated by reference in s. NR 440.17, or other methods and procedures as specified in this subsection, except as provided in s. NR 440.08 (2).

NR 440.62(6)(b)1.1. Method 21 shall be used to determine the presence of leaking sources. The instrument shall be calibrated before use each day of its use by the procedures specified in Method 21. The following calibration gases shall be used:

NR 440.62(6)(c)(c) The owner or operator shall determine compliance with the no detectable emission standards in sub. (3) (b) 5., (c) 9., (d), (g) 6. and (j) 5. as follows:

NR 440.62(6)(c)2.2. Method 21 shall be used to determine the background level. All potential leak interfaces shall be traversed as close to the interface as possible. The arithmetic difference between the maximum concentration indicated by the instrument and the background level is compared with 500 ppm for determining compliance.

NR 440.62(6)(d)(d) The owner or operator shall test each piece of equipment unless he or she demonstrates that a process unit is not in VOC service, that is, that the VOC content would never be reasonably expected to exceed 10% by weight. For purposes of this demonstration, the following methods and procedures shall be used:

NR 440.62(6)(d)1.1. Procedures that conform to the general methods in ASTM E168-92, E169- 93 or E260-96, incorporated by reference in s. NR 440.17 (2) (a) 73., 74. and 75., respectively, shall be used to determine the percent VOC content in the process fluid that is contained in or contacts a piece of equipment.

NR 440.62(6)(d)2.2. Organic compounds that are considered by the department to have negligible photochemical reactivity may be excluded from the total quantity of organic compounds in determining the VOC content of the process fluid.

NR 440.62(6)(d)3.3. Engineering judgment may be used to estimate the VOC content, if a piece of equipment has not been shown previously to be in service. If the department disagrees with the judgment, subds. 1. and 2. shall be used to resolve the disagreement.

NR 440.62(6)(e)1.1. The vapor pressure of one or more of the components is greater than 0.3 kPa at 20°C (1.2 in H2O at 68°F). Standard reference texts or ASTM D2879-97, incorporated by reference in s. NR 440.17 (2) (a) 35., shall be used to determine the vapor pressures.

NR 440.62(6)(e)2.2. The total concentration of the pure components having a vapor pressure greater than 0.3 kPa at 20°C (1.2 in H2O at 68°F) is equal to or greater than 20% by weight.

NR 440.62(6)(f)(f) Samples used in conjunction with pars. (d), (e) and (g) shall be representative of the process fluid that is contained in or contacts the equipment or the gas being combusted in the flare.