NR 440.26(6)(a)5.5. For Claus sulfur recovery plants with oxidation control systems or reduction control systems followed by incineration subject to sub. (5) (a) 2. a., an instrument for continuously monitoring and recording the concentration (dry basis, zero percent excess air) of SO2 emissions into the atmosphere. The monitor shall include an oxygen monitor for correcting the data for excess air. NR 440.26(6)(a)6.6. For Claus sulfur recovery plants with reduction control systems not followed by incineration subject to sub. (5) (a) 2. b., an instrument for continuously monitoring and recording the concentration of reduced sulfur and O2 emissions into the atmosphere. The reduced sulfur emission shall be calculated as SO2 (dry basis, zero percent excess air). NR 440.26(6)(a)6.b.b. The performance evaluations for this reduced sulfur (and O2) monitor under s. NR 440.13 (3) shall use Performance Specification 5 (and Performance Specification 3 for the O2 analyzer) of 40 CFR part 60, Appendix B, incorporated by reference in s. NR 440.17 (1). Methods 15 or 15A and Method 3 of 40 CFR part 60, Appendix A, incorporated by reference in s. NR 440.17 (1), shall be used for conducting the relative accuracy evaluations. If Method 3 yields O2 concentrations below 0.25% during the performance specification test, the O2 concentration may be assumed to be zero and the reduced sulfur CEMS need not include an O2 monitor. NR 440.26(6)(a)7.7. In place of the reduced sulfur monitor under subd. 6., an instrument using an air or O2 dilution and oxidation system to convert the reduced sulfur to SO2 for continuously monitoring and recording the concentration (dry basis, zero percent excess air) of the resultant SO2. The monitor shall include an oxygen monitor for correcting the data for excess oxygen. NR 440.26(6)(a)7.b.b. For reporting purposes, the SO2 exceedance level for this monitor is 250 ppm (dry basis, zero percent excess air). NR 440.26(6)(a)7.c.c. The performance evaluations for the SO2 (and O2) monitor under s. NR 440.13 (3) shall use Performance Specification 5. Methods 15 or 15A and Method 3 shall be used for conducting the relative accuracy evaluations. NR 440.26(6)(a)8.8. An instrument for continuously monitoring and recording concentrations of sulfur dioxide in the gases at both the inlet and outlet of the sulfur dioxide control device from any fluid catalytic cracking unit catalyst regenerator for which the owner or operator seeks to comply with sub. (5) (b) 1. NR 440.26(6)(a)8.a.a. The span value of the inlet monitor shall be set at 125% of the maximum estimated hourly potential sulfur dioxide emission concentration entering the control device, and the span value of the outlet monitor shall be set at 50% of the maximum estimated hourly potential sulfur dioxide emission concentration entering the control device. NR 440.26(6)(a)9.9. An instrument for continuously monitoring and recording concentrations of sulfur dioxide in the gases discharged into the atmosphere from any fluid catalytic cracking unit catalyst regenerator for which the owner or operator seeks to comply specifically with the 50 ppmv emission limit under sub. (5) (b) 1. NR 440.26(6)(a)9.a.a. The span value of the monitor shall be set at 50% of the maximum hourly potential sulfur dioxide emission concentration of the control device. NR 440.26(6)(a)10.10. An instrument for continuously monitoring and recording concentrations of oxygen (O2) in the gases at both the inlet and outlet of the sulfur dioxide control device (or the outlet only if specifically complying with the 50 ppmv standard) from any fluid catalytic cracking unit catalyst regenerator for which the owner or operator has elected to comply with sub. (5) (b) 1. The span of the continuous monitoring system shall be set at 10%. NR 440.26(6)(a)11.11. The continuous monitoring systems under par. (a) 8., 9. and 10. are operated and data recorded during all periods of operation of the affected facility including periods of startup, shutdown or malfunction, except for continuous monitoring system breakdowns, repairs, calibration checks, and zero and span adjustments. NR 440.26(6)(a)12.12. The owner or operator shall use the following procedures to evaluate the continuous monitoring systems under subds. 8., 9. and 10.: NR 440.26(6)(a)13.13. When seeking to comply with sub. (5) (b) 1., when emission data are not obtained because of continuous monitoring system breakdowns, repairs, calibration checks and zero and span adjustments, emission data will be obtained by using one of the following methods to provide emission data for a minimum of 18 hours per day in at least 22 out of 30 following successive calendar days: NR 440.26(6)(c)(c) The average coke burn-off rate (Mg (tons) per hour) and hours of operation shall be recorded daily for any fluid catalytic cracking unit catalyst regenerator subject to sub. (3), (4) or (5) (b) 2. NR 440.26(6)(d)(d) For any fluid catalytic cracking unit catalyst regenerator under sub. (3) that uses an incinerator-waste heat boiler to combust the exhaust gases from the catalyst regenerator, the owner or operator shall record daily the rate of combustion of liquid or solid fossil-fuels and the hours of operation during which liquid or solid fossil-fuels are combusted in the incinerator-waste heater boiler. NR 440.26(6)(e)(e) For the purpose of reports under s. NR 440.07 (3), periods of excess emissions that shall be determined and reported are defined as follows: