NR 440.54(3)(a)2.2. From any phosphate rock calciner processing unbeneficiated rock or blends of beneficiated and unbeneficiated rock, any gases which:

NR 440.54(3)(a)2.a.a. Contain particulate matter in excess of 0.12 kilogram per megagram of phosphate rock feed (0.23 lb/ton), or

NR 440.54(3)(a)3.3. From any phosphate rock calciner processing beneficiated rock any gases which:

NR 440.54(3)(a)3.a.a. Contain particulate matter in excess of 0.055 kilogram per megagram of phosphate rock feed (0.11 lb/ton), or

NR 440.54(3)(a)4.a.a. Contain particulate matter in excess of 0.006 kilogram per megagram of phosphate rock feed (0.012 lb/ton), or

NR 440.54(3)(a)5.5. From any ground phosphate rock handling and storage system any gases which exhibit greater than zero percent opacity.

NR 440.54(4)(a)(a) Any owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate a continuous monitoring system, except as provided in pars. (b) and (c), to monitor and record the opacity of the gases discharged into the atmosphere from any phosphate rock dryer, calciner or grinder. The span of this system shall be set at 40% opacity.

NR 440.54(4)(b)(b) For ground phosphate rock storage and handling systems, continuous monitoring systems for measuring opacity are not required.

NR 440.54(4)(c)(c) The owner or operator of any affected phosphate rock facility using a wet scrubbing emission control device will not be subject to the requirements in par. (a), but shall install, calibrate, maintain and operate the following continuous monitoring devices:

NR 440.54(4)(c)1.1. A monitoring device for the continuous measurement of the pressure loss of the gas stream through the scrubber. The monitoring device shall be certified by the manufacturer to be accurate within ±250 pascals (±one inch water) gauge pressure.

NR 440.54(4)(c)2.2. A monitoring device for the continuous measurement of the scrubbing liquid supply pressure to the control device. The monitoring device shall be accurate within ± 5% of design scrubbing liquid supply pressure.

NR 440.54(4)(d)(d) For the purpose of conducting a performance test under s. NR 440.08, the owner or operator of any phosphate rock plant subject to the provisions of this section shall install, calibrate, maintain and operate a device for measuring the phosphate rock feed to any affected dryer, calciner or grinder. The measuring device used shall be accurate to within ± 5% of the mass rate over its operating range.

NR 440.54(4)(e)(e) For the purpose of reports required under s. NR 440.07 (3), periods of excess emissions that shall be reported are defined as all 6-minute periods during which the average opacity of the plume from any phosphate rock dryer, calciner or grinder subject to par. (a) exceeds the applicable opacity limit.

NR 440.54(4)(f)(f) Any owner or operator subject to the requirements under par. (c) shall report on a frequency specified in s. NR 440.07 (3) all measurement results that are less than 90% of the average levels maintained during the most recent performance test conducted under s. NR 440.08 in which the affected facility demonstrated compliance with the standard under sub. (3).

NR 440.54(5)(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 for in s. NR 440.08 (2).

NR 440.54(5)(b)(b) The owner or operator shall determine compliance with the particulate matter standards in sub. (3) as follows:

NR 440.54(5)(b)1.1. The emission rate (E) of particulate matter shall be computed for each run using the following equation: