Wis. Admin. Code NR 439.09

Methods and procedures for continuous emission monitoring

Last amended: 2025Year: 2026Length: 1,389 wordsOfficial source

Cite as Wis. Admin. Code NR § 439.09

Methods and procedures for continuous emission monitoring. Methods and procedures for continuous emission monitoring. The owner or operator of a source conducting continuous emission monitoring under s. NR 439.095 shall use the methods and procedures listed in this section to install, calibrate, maintain and operate a continuous emissions monitoring system, or other methods and procedures approved, in writing, by the department: (1) Continuous emissions monitoring systems for measuring opacity shall comply with all of the provisions and requirements in Performance Specification 1 in 40 CFR part 60 , Appendices B and F, incorporated by reference under s. NR 484.04 (21) and (21m) . (2) Continuous emissions monitoring systems for measuring sulfur dioxide or nitrogen oxides shall comply with all the provisions and requirements in Performance Specification 2 in 40 CFR part 60 , Appendices B and F or, for affected units, the performance specifications in 40 CFR part 75 , Appendices A to I, incorporated by reference under s. NR 484.04 (21) , (21m) , and (27) . (3) Continuous emissions monitoring systems for measuring oxygen or carbon dioxide shall comply with all the provisions and requirements in Performance Specification 3 in 40 CFR part 60 , Appendices B and F or, for affected units, the performance specifications in 40 CFR part 75 , Appendices A to I, incorporated by reference under s. NR 484.04 (21) , (21m) , and (27) . (4) Continuous emissions monitoring systems for measuring carbon monoxide shall comply with all the provisions and requirements in Performance Specification 4, 4A, or 4B in 40 CFR part 60 , Appendices B and F, incorporated by reference under s. NR 484.04 (21) and (21m) . (5) Continuous emissions monitoring systems for measuring total reduced sulfur shall comply with all the provisions and requirements in Performance Specification 5 in 40 CFR part 60 , Appendix B, incorporated by reference in s. NR 484.04 (21) . (6) Continuous emission rate monitoring systems shall comply with all the provisions and requirements in Performance Specification 6 in 40 CFR part 60 , Appendix B, incorporated by reference in s. NR 484.04 (21) . (7) Continuous emissions monitoring systems for measuring hydrogen sulfide shall comply with all the provisions and requirements in Performance Specification 7 in 40 CFR part 60 , Appendices B and F, incorporated by reference under s. NR 484.04 (21) and (21m) . (7m) Continuous emissions monitoring systems for measuring VOCs or total hydrocarbons shall comply with all the provisions and requirements in Performance Specification 8 or 8A in 40 CFR part 60 , Appendices B and F, incorporated by reference under s. NR 484.04 (21) and (21m) . (7p) Continuous emissions monitoring systems for measuring filterable particulate matter shall comply with all the provisions and requirements in Performance Specification 11 in 40 CFR part 60 , Appendices B and F, incorporated by reference under s. NR 484.04 (21) and (21m) . (7r) Continuous emissions monitoring systems for measuring mercury shall comply with all the provisions and requirements in Performance Specifications 12 and 12A in 40 CFR part 60 , Appendices B and F, incorporated by reference under s. NR 484.04 (21) and (21m) . (7t) Continuous monitoring systems for predictive emissions monitoring shall comply with all the provisions and requirements in Performance Specification 16 in 40 CFR part 60 , Appendix B, incorporated by reference under s. NR 484.04 (21) . (7v) Continuous emissions monitoring systems for measuring hydrogen chloride shall comply with all the provisions and requirements in Performance Specification 18 in 40 CFR part 60 , Appendices B and F, incorporated by reference under s. NR 484.04 (21) and (21m) . (8) The owner or operator of a continuous emissions monitoring system shall comply with the quality control and quality assurance plan submitted by the owner or operator of the source and approved by the department. (9) Continuous emissions monitoring systems shall meet the following minimum frequency of operation requirements: (a) Opacity monitors shall complete at least one cycle of sampling and analyzing for each successive 10-second period and one cycle of data recording for each successive 6-minute period. (b) Monitors for sulfur dioxide, nitrogen oxides, oxygen, carbon dioxide, carbon monoxide, hydrogen sulfide, total reduced sulfur, filterable particulate matter, mercury as measured by an analyzer, hydrogen chloride, predictive emission monitoring system, and VOCs shall complete at least one cycle of sampling, analyzing, and data recording for each successive 15-minute period. The values recorded shall be averaged hourly. Hourly averages shall be computed from at least 4 data points equally spaced over each one-hour period, except during periods when calibration, quality assurance, or maintenance activities are being performed. During these periods, a valid hour shall consist of at least 2 data points separated by a minimum of 15 minutes, with one valid data point in each of the 15-minute quadrants of the hour. (10) (ag) The owner, operator, or designee of a continuous emissions monitoring system shall submit quarterly summary excess emission reports to the department within 30 calendar days following the end of each calendar quarter. The summary excess emission report shall include all of the following: 1. Pollutant monitored. 2. Stack and process. 3. Pollutant emission limitation. 4. Reporting period date range. 5. Total source operating time in reporting period. 6. Facility name and address. 7. Monitor manufacturer and model number. 8. Dates of latest monitor audit and certification. 9. Type of monitor audit and applicable results. 10. Duration of excess emissions by category: startup/shutdown, sootblowing, fuel problems, process malfunction, control equipment malfunction, other known causes, unknown causes, and sum of excess emissions. 11. Duration of monitor downtime by category including monitor equipment malfunction, non-monitor equipment malfunction, quality assurance/quality control calibration, other known causes, unknown causes, and sum of monitor downtime. 12. The percent of operating time with excess emissions or monitor downtime calculated as the sum of excess emissions or monitor downtime divided by the total source operating time in the reporting period, multiplied by 100. 13. A statement indicating that the information in the report is true, accurate, and complete. 14. The owner or operator’s name, title, and signature, and the date. (ar) If the total duration of excess emissions is 1 percent or greater or the total continuous emission monitoring system downtime is 5 percent or greater for the reporting period specified under par. (ag) , then the owner, operator, or designee of a continuous emissions monitoring system shall submit both the summary excess emission report required under par. (ag) and a full excess emission report to the department within 30 calendar days following the end of each calendar quarter. The full excess emission report required under this paragraph shall contain all of the following information: 1. The date and starting and ending times or duration of each period of excess emissions and the magnitude of the emissions. 2. The periods of excess emissions that occur during startups, shutdowns, sootblowing, control equipment malfunction, process malfunction, fuel problems, other known causes or for unknown causes. The report shall identify the cause of any malfunction and the measures taken to reduce excess emissions. 3. The date and starting and ending time of any period during which the monitoring system was inoperative for any reason or causes, including monitor malfunction or calibration, except for zero and span checks. The report shall identify the repairs or adjustments made to the system. 4. The date and starting and ending time of any period during which the process being monitored was inoperative. 5. When no period of excess emissions occurred during the quarter and the monitoring system had no period of downtime, an excess emissions report shall be filed stating such information. (b) Unless otherwise specified by the department or an applicable standard, in the reports required under this subsection, periods of excess emissions shall be reported as follows: 1. For opacity, any 6-minute period during which the average opacity exceeds the applicable emission limit. 6. For all other air pollutants, any one-hour period during which the average emissions exceed the applicable emission limitation. (c) For purposes of reporting exceedances on the basis of a 24-hour rolling average under this subsection, any hourly average may be included in only one 24-hour period. An exceedance shall be based on at least 18 and not more than 24 valid recordings of hourly average emission rates in any 24 hour period.
Wis. Admin. Code NR 439.09: Methods and procedures for continuous emission monitoring | Justis AI