(a) The continuous monitoring provisions of this section apply to owners of stationary combustion installations:

1. (1) with a total heat input greater than 250 million Btu per hour. If two or more emission sources are exhausted through a common emission point, the total heat input for such an emission point is either the sum of the maximum operating heat inputs of all emission sources that are operated simultaneously and exhausted through the common emission point, or the maximum operating heat input of any individual emission source operated independently and connected to the common emission point, whichever is greater;
2. (2) that are equipped with approved sulfur dioxide control equipment; or
3. (3) that are subject to a sulfur dioxide equivalent emissions rate for a fuel mixture pursuant to section 225-1.4(a) of this Subpart.

(b) Continuous emission monitors (CEM) for sulfur compound emissions (expressed as sulfur dioxide) must be installed and operated at all times that the stationary combustion installation is in service. Such instruments must be operated in accordance with manufacturer's instructions, must satisfy the criteria in “performance specification 2”, appendix B, part 60 of title 40 of the Code of Federal Regulations (see Table 1, section 200.9 of this Title), and must be acceptable to the department. Exceptions to these requirements are:

1. (1) stationary combustion installations where gaseous fuel is the only fuel fired; or
2. (2) stationary combustion installations, not including any equipped with sulfur dioxide control equipment, whose fuel (including waste oil) is subjected to representative sampling and sulfur analysis conducted in a manner approved by the department; or
3. (3) stationary combustion installations required to use the continuous monitoring specifications under 40 CFR part 75 (see Table 1, section 200.9 of this Title).