1. (1) Compliance with the NOx emission requirement listed in Subsection R307-316-4(1) shall be determined according to the following procedures:

   1. (a) U.S.EPA Reference Method 7E, Determination of Nitrogen Oxides Emissions from Stationary Sources;
   2. (b) a continuous in-stack nitrogen oxide monitor or equivalent verification system in compliance with 40 CFR Part 60 Appendix B Specification 2;
   3. (c) other EPA-approved testing methods acceptable to the director; or
   4. (d) combustion analysis as part of a regular maintenance schedule.

2. (2) Compliance with the CO emissions requirement listed in Subsection R307-316-4(1) shall be determined according to the following procedures:

   1. (a) U.S.EPA Reference Method 10, Determination of Carbon Monoxide Emissions from Stationary Sources;
   2. (b) a continuous in-stack carbon monoxide monitor or equivalent verification system in compliance with 40 CFR Part 60 Appendix B Specification 4;
   3. (c) other EPA-approved testing methods acceptable to the director; or
   4. (d) combustion analysis as part of a regular maintenance schedule.

3. (3) Compliance Determination shall be conducted according to the following frequency:

   1. (a) once every three years for units with a rated heat input capacity greater than or equal to 10 MMBtu/hr, except for boilers subject to Subsection R307-316-6(1)(b) and Subsection R307-316-6(2)(b); and
   2. (b) once every five years for units with a rated heat input capacity less than 10 MMBtu/hr but no more than 5 MMBtu/hr.

4. (4) Provided an emissions test is conducted within the same calendar year as the test required in Subsection R307-316-6(3), an owner or operator may use the following emissions tests to comply with Subsection R307-316-6(3):

   1. (a) periodic monitoring or testing of a unit as required in a Title V permit; or
   2. (b) relative accuracy testing for continuous emissions monitoring verification pursuant to 40 CFR Part 60 Appendix B Specification 2 and 40 CFR Part 60 Appendix B Specification 4.
5. (5) The compliance schedule for this rule shall begin on November 1, 2024.

KEY: air pollution, boiler, NOx, nitrogen oxides

Date of Last Change: November 1, 2024

Authorizing, and Implemented or Interpreted Law: 19-2-104