Pennsylvania Code › Title 25 - ENVIRONMENTAL PROTECTION › Part I - Department of Environmental Protection › Subpart C - Protection of Natural Resources › Article III - Air Resources › Chapter 129 - STANDARDS FOR SOURCES › ADDITIONAL NO[x] REQUIREMENTS › Section 129.204 - Emission accountability

Current through Register Vol. 54, No. 28, July 13, 2024
(a)
						This section applies to units described in §§
												129.201-129.203 (relating to boilers;
						stationary combustion turbines; and stationary internal combustion
						enginers).
(b) The owner or
						operator shall determine actual emissions in accordance with one of the
						following:
(1) If the owner or operator of the
						unit is required to monitor NOx emissions with a CEMS operated and maintained
						in accordance with a permit or State or Federal regulation, the CEMS data
						reported to the Department to comply with the monitoring and reporting
						requirements of this article shall be used. Any data invalidated under Chapter
						139 (relating to sampling and testing) shall be substituted with data
						calculated using the potential emission rate for the unit or, if approved by
						the Department in writing, an alternative amount of emissions that is more
						representative of actual emissions that occurred during the period of invalid
						data.
(2) If the owner or operator
						of the unit is not required to monitor NOx emissions with a CEMS, one of the
						following shall be used to determine actual emissions of NOx:
(i) The 1-year average emission rate
						calculated from the most recent permit emission limit compliance demonstration
						test data for NOx.
(ii) The maximum
						hourly allowable NOx emission rate contained in the permit or the higher of the
						following:
(A) The highest rate determined by
						use of the emission factor for the unit class contained in the most up-to-date
						version of the EPA publication, "
AP-42 Compilation of Air Pollution
						Emission Factors
."
(B) The
						highest rate determined by use of the emission factor for the unit class
						contained in the most up-to-date version of EPA's "Factor Information Retrieval
						(FIRE)" data system.
(iii) CEMS data, if the owner or operator
						elects to monitor NOx emissions with a CEMS. The owner or operator shall
						monitor emissions and report the data from the CEMS in accordance with Chapter
						139 or Chapter 145 (relating to interstate pollution transport reduction). Any
						data invalidated under Chapter 139 shall be substituted with data calculated
						using the potential emission rate for the unit or, if approved by the
						Department in writing, an alternative amount of emissions that is more
						representative of actual emissions that occurred during the period of invalid
						data.
(iv) An alternate calculation
						and recordkeeping procedure based upon emissions testing and correlations with
						operating parameters. The operator of the unit shall demonstrate that the
						alternate procedure does not underestimate actual emissions throughout the
						allowable range of operating conditions. In regard to obtaining the
						Department's approval for an alternate calculation method and recordkeeping
						procedure for actual emissions, the owner or operator may request an adjustment
						to the allowable emissions calculations set forth in §§
														129.201-129.203. An allowable emission
						adjustment may not overestimate a unit's allowable emissions and must be based
						upon the parameters and procedures proposed in the alternate calculation method
						for actual emissions. The alternate calculation and recordkeeping procedures
						must be approved by the Department, in writing, prior to
						implementation.