NR 440.62(4)(a)1.1. An owner or operator may elect to comply with an allowable percentage of valves leaking of equal to or less than 2.0%. NR 440.62(4)(a)2.2. The following requirements shall be met if an owner or operator wishes to comply with an allowable percentage of valves leaking: NR 440.62(4)(a)2.a.a. An owner or operator shall notify the department that the owner or operator has elected to comply with the allowable percentage of valves leaking before implementing this alternative standard, as specified in sub. (8) (d). NR 440.62(4)(a)2.b.b. A performance test as specified in subd. 3. shall be conducted initially upon designation, annually, and at other times requested by the department. NR 440.62(4)(a)3.a.a. All valves in gas/vapor and light liquid service within the affected facility shall be monitored within 1 week by the methods specified in sub. (6) (b). NR 440.62(4)(a)3.b.b. If an instrument reading of 10,000 ppm or greater is measured a leak is detected. NR 440.62(4)(a)3.c.c. The leak percentage shall be determined by dividing the number of valves for which leaks are detected by the number of valves in gas/vapor and light liquid service within the affected facility. NR 440.62(4)(a)4.4. Owners and operators who elect to comply with this alternative standard may not have an affected facility with a leak percentage greater than 2.0%. NR 440.62(4)(b)1.a.a. An owner or operator may elect to comply with one of the alternative work practices specified in subd. 2. b. and c. NR 440.62(4)(b)1.b.b. An owner or operator shall notify the department before implementing one of the alternative work practices, as specified in sub. (8) (d). NR 440.62(4)(b)2.a.a. An owner or operator shall comply initially with the requirements for valves in gas/vapor service and valves in light liquid service, as described in sub. (3) (g). NR 440.62(4)(b)2.b.b. After 2 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 1 of the quarterly leak detection periods for the valves in gas/vapor and light liquid service. 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(4)(b)2.f.f. An owner or operator shall keep a record of the percent of valves found leaking during each leak detection period. 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)(b) The owner or operator shall determine compliance with the standards in subs. (3) and (4) as follows: 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)(b)1.b.b. A mixture of methane or n-hexane and air at a concentration of about, but less than, 10,000 ppm methane or n-hexane.