Current through Register Vol. 54, No. 45, November 9, 2024
Section 127.203a - Applicability determination(a) The Department will conduct an applicability determination during its review of a plan approval application for the construction of a new major facility or modification at an existing major facility under this section. The owner or operator of the facility shall include in the plan approval application the estimate of an emissions increase in a regulated NSR pollutant from the project. The owner or operator shall calculate an emissions increase in a regulated NSR pollutant from a project in accordance with paragraph (1). The owner or operator shall calculate a net emissions increase in accordance with paragraph (1)(ii), if the emissions increase from a project equals or exceeds the applicable emissions rate that is "significant" as defined in § 121.1 (relating to definitions). If the emissions increase from a project does not exceed the listed applicable emissions rate that is significant, the owner or operator shall calculate the net emissions increase in accordance with paragraph (2). (1) As part of the plan approval application, the owner or operator of the facility shall calculate whether a significant emissions increase and a significant net emissions increase will occur as a result of a physical change or change in the method of operation. The owner or operator of the facility shall use the procedures in subparagraph (i) to calculate the emissions increase in a regulated NSR pollutant due to the project, and the procedures in subparagraph (ii) to calculate the net emissions increase in a regulated NSR pollutant. A project is a major modification for a regulated NSR pollutant if it causes two types of emissions increases-a significant emissions increase and a significant net emissions increase. If the project causes a significant emissions increase, the project is a major modification if it also results in a significant net emissions increase. (i) The emissions increase in a regulated NSR pollutant due to the project will be the sum of the following: (A) For existing emissions units, an emissions increase of a regulated NSR pollutant is the difference between the projected actual emissions and the baseline actual emissions for each unit, as determined in paragraphs (4) and (5). When calculating an increase in emissions that results from the particular project, exclude that portion of the unit's emissions following completion of the project that existing units could have accommodated during the consecutive 24-month period used to establish the baseline actual emissions and that is also unrelated to the particular project, including all increased utilization due to product demand growth as specified in paragraph (5)(i)(C).(B) For new emissions units, the emissions increase of a regulated NSR pollutant will be the potential to emit from each new emissions unit.(ii) The net emissions increase for a regulated NSR pollutant emitted by a major facility will be the amount by which the sum of the following exceeds zero:(A) The increase in emissions from a physical change or change in the method of operation at a major facility as calculated under subparagraph (i).(B) Other increases and decreases in actual emissions at the major facility that are contemporaneous with the project and are otherwise creditable.(I) An increase or decrease in actual emissions is contemporaneous with the increase from the particular change only if it occurs between the date 5 years before construction on the project commences and the date that construction on the project is completed.(II) Baseline actual emissions for calculating increases are determined as specified under paragraph (4), except that paragraph (4)(i)(D) does not apply.(2) As part of the plan approval application for a proposed de minimis emission increase, the owner or operator of the facility shall use subparagraphs (i) and (ii) to calculate the net emissions increase for a regulated NSR pollutant except PM2.5 and PM2.5 precursors. For a proposed de minimis increase in which the net emissions increase calculated using subparagraphs (i) and (ii) meets or exceeds the emissions rate that is significant, only the emissions offset requirements in this subchapter apply to the net emissions increase. (i) The net emissions increase is the sum of the proposed de minimis increase due to the project and the previously determined increases in potential emissions or actual emissions and decreases in actual emissions that are contemporaneous with the project.(ii) An increase or decrease is contemporaneous if it occurred within 10 years prior to the date of the Department's receipt of a complete plan approval application.(3) An increase or a decrease is creditable for applicability determination purposes if it meets the following conditions: (i) The Department has not relied on it in issuing a permit for the facility under this subchapter, for which the permit is in effect when the increase in emissions from the project occurs.(ii) The increase is creditable to the extent that the new level of emissions exceeds the old level of emissions.(iii) An actual emissions decrease is creditable if the following conditions are met: (A) The ERC provisions in § 127.207(1) and (3)-(7) (relating to creditable emissions decrease or ERC generation and creation) have been complied with, and the decrease in emissions is Federally enforceable by the time construction begins on the project. The plan approval for the project will contain a provision specifying that the emissions decrease is Federally enforceable on or before the construction date.(B) The emissions decrease is such that when compared with the proposed emissions increase there is no significant change in the character of the emissions, including seasonal emission patterns, stack heights or hourly emission rates.(C) The emissions decrease represents approximately the same qualitative significance for public health and welfare as attributed to the proposed increase. This requirement is satisfied if the emissions rate that is significant is not exceeded.(D) An emissions decrease or an ERC generated at the facility may be used as a creditable decrease in a net emissions increase. The use of the ERCs in applicability determinations for netting purposes is limited to the period specified in paragraphs (1)(ii) and (2). A portion of an ERC generated at another facility, acquired by trade and incorporated in a plan approval for use at the facility, is not creditable as an emissions decrease.(iv) An actual or potential emissions increase that results from a physical change in a facility occurs when the emissions unit on which construction occurred becomes operational and begins to emit a particular pollutant. A replacement unit that requires shakedown becomes operational only after a reasonable shakedown period, not to exceed 180 days.(4) The following procedures apply in determining the baseline actual emissions for an existing emissions unit:(i) For an existing emissions unit, baseline actual emissions are the average rate, in TPY, at which the unit emitted the regulated NSR pollutant during a consecutive 24-month period selected by the owner or the operator within the 5-year period immediately prior to the date a complete plan approval application is received by the Department. The Department may approve the use of a different consecutive 24-month period within the last 10 years upon a written determination that it is more representative of normal source operation. (A) The average rate includes fugitive emissions to the extent quantifiable and emissions associated with startups and shutdowns; the average rate does not include excess emissions including emissions associated with upsets or malfunctions.(B) The average rate is adjusted downward to exclude noncompliant emissions that occurred while the source was operating above an emissions limitation that was legally enforceable during the consecutive 24-month period.(C) The average rate is adjusted downward to exclude emissions that would have exceeded an emissions limitation with which the facility must currently comply, had the facility been required to comply with the limitations during the consecutive 24-month period. The baseline actual emissions is based on the emissions limitation in this subchapter or a permit limitation or other more stringent emissions limitation required by the Clean Air Act or the act, whichever is more restrictive.(D) For a regulated NSR pollutant, when a project involves multiple emissions units, the same consecutive 24-month period must be used to determine the baseline actual emissions for the emissions units being changed. The same consecutive 24-month period shall be used for all regulated NSR pollutants unless the owner or operator demonstrates, in writing, to the Department that a different consecutive 24-month period is more appropriate and the Department approves, in writing, the different consecutive 24-month period for a regulated NSR pollutant or pollutants.(E) The average rate is not based on a consecutive 24-month period for which there is inadequate information for:(I) Determining annual emissions, in TPY.(II) Adjusting this amount if required by clause (B) or (C).(F) The average rate is not greater than the emissions previously submitted to the Department in the required emissions statement and for which applicable emission fees have been paid.(ii) For a new emissions unit, the baseline actual emissions equal zero and thereafter, for all other purposes, shall equal the unit's potential to emit.(iii) The baseline actual emissions is determined by measurement, calculations or estimations in the order of the following preferences:(A) Monitoring systems including:(I) CEMS data interpolated to annual emissions using flow meters and conversion factors.(II) PEMS approved, in writing, by the Department.(B) Other measurements and calculations including: (I) Stack measurement which generates emission estimates using stack test derived emission factors and throughput.(II) A mass balance equation which includes the following elements: (-a-) The amount of materials used per unit of time, determined through measurements of parameters representing process conditions.
(-b-) The emissions per unit mass of material used, determined using mass balance techniques.
(-c-) The annual emissions, calculated using emissions per unit mass of material and amount of material used per unit of time.
(C) Emission factors, including generally recognized and accepted emission factors by EPA, such as USEPA "Compilation of Air Pollutant Emission Factors" (AP-42) or other emission factors accepted by the Department.(D) Other calculations and measurements as approved by the Department.(5) Projected actual emissions is the maximum annual rate, in TPY, at which an existing emissions unit is projected to emit a regulated NSR pollutant in any one of the 5 years (12-month period) following the date the unit resumes regular operation after the project, or in any one of the 10 years following that date, if the project involves increasing the emissions unit's design capacity or its potential to emit of that regulated NSR pollutant and full utilization of the unit would result in a significant emissions increase or a significant net emissions increase at the major facility. The following procedures apply in determining the projected actual emissions of a regulated NSR pollutant for an emissions unit, before beginning actual construction on the project:(i) The owner or operator of the major facility shall: (A) Consider all relevant information, including, but not limited to, historical operational data, the company's own representations, the company's expected business activity and the company's highest projections of business activity, and the company's filings with the State or Federal regulatory authorities.(B) Include fugitive emissions to the extent quantifiable, and emissions associated with startups and shutdowns.(C) Exclude, in calculating any increase in emissions that results from the particular project, that portion of the unit's emissions following completion of the project that existing units could have accommodated during the consecutive 24-month period used to establish the baseline actual emissions and that is also unrelated to the particular project, including any increased utilization due to product demand growth.(ii) In lieu of using the method set out in subparagraph (i), the owner or operator of the major facility may elect to use the emissions unit's potential to emit, in TPY.(iii) If the projected actual emissions for a regulated NSR pollutant are in excess of the baseline actual emissions, the following apply:(A) The projected actual emissions for the regulated NSR pollutant must be incorporated into the required plan approval or the operating permit as an emission limit.(B) The owner or operator shall monitor the emissions of the regulated NSR pollutant for which a limit is established in clause (A) and calculate and maintain a record of emissions, in TPY on a calendar year basis, for 5 years following resumption of regular operations after the change, or for 10 years following resumption of regular operations after the change if the project increases the design capacity or potential to emit of that regulated NSR pollutant at the emissions unit.(C) The owner or operator shall record sufficient information to identify for all emission units in the approved project their total actual annual emissions and their actual annual emissions increase due to the project.(D) The owner or operator shall submit a report to the Department, within 60 days after the end of each calendar year, which contains the emissions data required by clauses (B) and (C). This report must also contain a demonstration of how these emissions were determined if the determination was not by direct measurement with a Department-certified CEMS system.(b) An owner or operator of a major facility with a PAL for a regulated NSR pollutant shall comply with the requirements under § 127.218 (relating to PALs).The provisions of this §127.203a adopted May 18, 2007, effective 5/19/2007, 37 Pa.B. 2365; amended September 2, 2011, effective 9/3/2011, 41 Pa.B. 4761. This section cited in 25 Pa. Code § 127.201 (relating to general requirements); 25 Pa. Code § 127.203 (relating to facilities subject to special permit requirements); 25 Pa. Code § 127.205 (relating to special permit requirements); 25 Pa. Code § 127.206 (relating to ERC general requirements); and 25 Pa. Code § 127.213 (relating to construction and demolition).