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The Pennsylvania Code website reflects the Pennsylvania Code changes effective through 54 Pa.B. 488 (January 27, 2024).

25 Pa. Code § 123.46. Monitoring requirements.

§ 123.46. Monitoring requirements.

 (a)  The following sources are subject to this section:

   (1)  Fossil fuel-fired steam generators with an annual average capacity factor of greater than 30%, as demonstrated to the Department by the owner or operator, and of greater than 250 million Btu per hour heat input except where:

     (i)   Natural gas is the only fuel burned.

     (ii)   Oil or a mixture of gas and oil are the fuels burned and the source is able to comply with the applicable particulate matter and opacity regulations without utilization of particulate matter collection equipment and the source has not been found, within the 5 years previous to the applicability of this section, through any administrative or judicial proceedings to be in violation of any visible emissions standard.

   (2)  Catalyst regenerators for fluid bed catalytic cracking units at petroleum refineries, if the unit is of greater than 20,000 barrels per day fresh feed capacity.

 (b)  All sources subject to the provisions of this section shall install, operate and maintain continuous opacity monitoring devices in compliance with Chapter 139, Subchapter C (relating to requirements for continuous in-stack monitoring for stationary sources). Results of opacity monitoring shall be submitted to the Department on a regular basis in compliance with the requirements of Chapter 139, Subchapter C.

 (c)  The Department may exempt a source from the requirements of subsection (b) if the Department determines that the installation of a continuous emission monitoring system would not provide accurate determination of emissions or that installation of a continuous emission monitoring system may not be implemented by a source due to physical plant limitations or to extreme economic reasons. The Department will require such an exempted source to fulfill alternative emission monitoring and reporting requirements.

 (d)  The Department may use the data from the monitoring devices or from the alternative monitoring systems required by this section to enforce the visible emission limitations defined in this article.

 (e)  Compliance with this section shall be obtained no later than 18 months after the effective date of the listing of any source identified in subsection (a). The Department may grant orders providing reasonable extension of time for sources that have made good faith efforts to install, operate and maintain continuous monitoring devices but have been unable to complete such operations within the time period provided.


   The provisions of this §  123.46 issued under the Air Pollution Control Act (35 P. S. § §  4001—4015).


   The provisions of this §  123.46 adopted June 19, 1981, effective June 20, 1981, 11 Pa.B. 2132; corrected June 26, 1981, effective June 20, 1981, 11 Pa.B. 2225.

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