       Proposed Amendments to 40 CFR Part 75 Shown as Redline-Strikeout
                                       
Support Document for the Proposed Federal Implementation Plan Addressing Regional Ozone Transport for the 2015 Ozone National Ambient Air Quality Standards
                        Docket ID EPA-HQ-OAR-2021-0668
                                 February 2022
                                       

Note: While EPA has taken steps to ensure the accuracy of this redline-strikeout document, it is not an official version of either the existing regulations or the proposed amended regulations. For the official text of the existing regulations, please see the Code of Federal Regulations. For the amendatory language proposed in this action, please see the proposal published in the Federal Register, available in the docket for this action. 

                                       
               40 CFR Part 75 -- Continuous Emission Monitoring *
             Subpart H -- NOX Mass Emissions Provisions [excerpts]

§ 72.72 -- Determination of NOX mass emissions for common stack and multiple stack configurations.
§ 72.73 -- Recordkeeping and reporting.
§ 72.75 -- Additional ozone season calculation procedures.
* The proposed amendments to 40 CFR part 75, appendix F (Conversion Procedures) are not included in this document.

§ 75.72 Determination of NOX mass emissions for common stack and multiple stack configurations.
   The owner or operator of an affected unit shall either: calculate hourly NOX mass emissions (in lbs) by multiplying the hourly NOX emission rate (in lbs/mmBtu) by the hourly heat input rate (in mmBtu/hr) and the unit or stack operating time (as defined in § 72.2), or, as provided in paragraph (e) of this section, calculate hourly NOX mass emissions from the hourly NOX concentration (in ppm) and the hourly stack flow rate (in scfh). Only one methodology for determining NOX mass emissions shall be identified in the monitoring plan for each monitoring location at any given time. The owner or operator shall also calculate quarterly and cumulative year-to-date NOX mass emissions and cumulative NOX mass emissions for the ozone season (in tons) by summing the hourly NOX mass emissions according to the procedures in section 8 of appendix F to this part. 
      (a) Unit utilizing common stack with other affected unit(s). 
         When an affected unit utilizes a common stack with one or more affected units, but no nonaffected units, the owner or operator shall either: 
            (1) Install, certify, operate, and maintain a NOX-diluent continuous emissions monitoring system and a flow monitoring system in the common stack, record the combined NOX mass emissions for the units exhausting to the common stack, and, for purposes of determining the hourly unit heat input rates, either: 
               (i) Apportion the common stack heat input rate to the individual units according to the procedures in § 75.16(e)(3); or 
               (ii) Install, certify, operate, and maintain a flow monitoring system and diluent monitor in the duct to the common stack from each unit; or 
               (iii) If any of the units using the common stack are eligible to use the procedures in appendix D to this part, 
                  (A) Use the procedures in appendix D to this part to determine heat input rate for that unit; and 
                  (B) Install, certify, operate, and maintain a flow monitoring system and a diluent monitor in the duct to the common stack for each remaining unit; or 
            (2) Install, certify, operate, and maintain a NOX-diluent continuous emissions monitoring system in the duct to the common stack from each unit and, for purposes of heat input determination, either: 
               (i) Install, certify, operate, and maintain a flow monitoring system in the duct to the common stack from each unit; or 
               (ii) For any unit using the common stack and eligible to use the procedures in appendix D to this part, 
                  (A) Use the procedures in appendix D to determine heat input rate for that unit; and 
                  (B) Install, certify, operate, and maintain a flow monitoring system in the duct to the common stack for each remaining unit. 
      (b) Unit utilizing common stack with nonaffected unit(s). 
         When one or more affected units utilizes a common stack with one or more nonaffected units, the owner or operator shall either: 
            (1) Install, certify, operate, and maintain a NOX-diluent continuous emission monitoring system in the duct to the common stack from each affected unit and, for purposes of heat input determination, 
               (i) Install, certify, operate, and maintain a flow monitoring system in the duct to the common stack from each affected unit; or 
               (ii) For any affected unit using the common stack and eligible to use the procedures in appendix D to this part, 
                  (A) Use the procedures in appendix D to determine heat input for that unit; however, for a common pipe configuration, the heat input apportionment provisions in section 2.1.2 of appendix D to this part shall not be used to meet the NOX mass reporting provisions of this subpart unless all of the units served by the common pipe are affected units and have similar efficiencies; and 
                  (B) Install, certify, operate, and maintain a flow monitoring system in the duct to the common stack for each remaining affected unit that exhausts to the common stack; or 
            (2) Install, certify, operate, and maintain a NOX-diluent continuous emission monitoring system in the common stack; and 
               (i) Designate the nonaffected units as affected units in accordance with the applicable State or federal NOX mass emissions reduction program and meet the requirements of paragraph (a)(1) of this section; or 
               (ii) Install, certify, operate, and maintain a flow monitoring system in the common stack and a NOX-diluent continuous emission monitoring system in the duct to the common stack from each nonaffected unit. The designated representative shall submit a petition to the permitting authority and the Administrator to allow a method of calculating and reporting the NOX mass emissions from the affected units as the difference between NOX mass emissions measured in the common stack and NOX mass emissions measured in the ducts of the nonaffected units, not to be reported as an hourly value less than zero. The permitting authority and the Administrator may approve such a method whenever the designated representative demonstrates, to the satisfaction of the permitting authority and the Administrator, that the method ensures that the NOX mass emissions from the affected units are not underestimated. In addition, the owner or operator shall also either: 
                  (A) Install, certify, operate, and maintain a flow monitoring system in the duct from each nonaffected unit or, 
                  (B) For any nonaffected unit exhausting to the common stack and otherwise eligible to use the procedures in appendix D to this part, determine heat input rate using the procedures in appendix D for that unit. However, for a common pipe serving both affected and non-affected units, the heat input rate apportionment provisions in section 2.1.2 of appendix D to this part shall not be used to meet the NOX mass reporting provisions of this subpart. For any remaining nonaffected unit that exhausts to the common stack, install, certify, operate, and maintain a flow monitoring system in the duct to the common stack; or 
               (iii) Install a flow monitoring system in the common stack and record the combined emissions from all units as the combined NOX mass emissions for the affected units for recordkeeping and compliance purposes, in accordance with paragraph (a) of this section; or 
               (iv) Submit a petition to the permitting authority and the Administrator to allow use of a method for apportioning NOX mass emissions measured in the common stack to each of the units using the common stack and for reporting the NOX mass emissions. The permitting authority and the Administrator may approve such a method whenever the designated representative demonstrates, to the satisfaction of the permitting authority and the Administrator, that the method ensures that the NOX mass emissions from the affected units are not underestimated. 
      (c) Unit with a main stack and a bypass stack. 
         Whenever any portion of the flue gases from an affected unit can be routed through a bypass stack to avoid the installed NOX-diluent continuous emissions monitoring system or NOX concentration monitoring system, the owner and operator shall either: 
            (1) Install, certify, operate, and maintain separate NOX-diluent continuous emissions monitoring systems and flow monitoring systems on the main stack and the bypass stack and calculate NOX mass emissions for the unit as the sum of the NOX mass emissions measured at the two stacks; 
            (2) Monitor NOX mass emissions at the main stack using a NOX-diluent CEMS and a flow monitoring system and measure NOX mass emissions at the bypass stack using the reference methods in § 75.22(b) for NOX concentration, flow rate, and diluent gas concentration, or NOX concentration and flow rate, and calculate NOX mass emissions for the unit as the sum of the emissions recorded by the installed monitoring systems on the main stack and the emissions measured by the reference method monitoring systems; or 
            (3) Install, certify, operate, and maintain a NOX-diluent CEMS and a flow monitoring system only on the main stack. If this option is chosen, it is not necessary to designate the exhaust configuration as a multiple stack configuration in the monitoring plan required under § 75.53, since only the main stack is monitored. For each unit operating hour in which the bypass stack is used and the emissions are either uncontrolled (or the add-on controls are not documented to be operating properly), report NOX mass emissions as follows. If the unit heat input is determined using a flow monitor and a diluent monitor, report NOX mass emissions using the maximum potential NOX emission rate, the maximum potential flow rate, and either the maximum potential CO2 concentration or the minimum potential O2 concentration (as applicable). The maximum potential NOX emission rate may be specific to the type of fuel combusted in the unit during the bypass (see § 75.33(c)(8)). If the unit heat input is determined using a fuel flowmeter, in accordance with appendix D to this part, report NOX mass emissions as the product of the maximum potential NOX emission rate and the actual measured hourly heat input rate. Alternatively, for a unit with NOX add-on emission controls, for each unit operating hour in which the bypass stack is used but the add-on NOX emission controls are not bypassed, the owner or operator may report the maximum controlled NOX emission rate (MCR) instead of the maximum potential NOX emission rate provided that the add-on controls are documented to be operating properly, as described in the quality assurance/quality control program for the unit, required by section 1 in appendix B to this part. To provide the necessary documentation, the owner or operator shall record parametric data to verify the proper operation of the NOX add-on emission controls as described in § 75.34(d). Furthermore, the owner or operator shall calculate the MCR using the procedure described in section 2.1.2.1(b) of appendix A to this part by replacing the words "maximum potential NOX emission rate (MER)" with the words "maximum controlled NOX emission rate (MCR)" and by using the NOX MEC in the calculations instead of the NOX MPC. 
      (d) Unit with multiple stack or duct configuration. 
         When the flue gases from an affected unit discharge to the atmosphere through more than one stack, or when the flue gases from an affected unit utilize two or more ducts feeding into a single stack and the owner or operator chooses to monitor in the ducts rather than in the stack, the owner or operator shall either: 
            (1) Install, certify, operate, and maintain a NOX-diluent continuous emission monitoring system and a flow monitoring system in each of the multiple stacks and determine NOX mass emissions from the affected unit as the sum of the NOX mass emissions recorded for each stack. If another unit also exhausts flue gases into one of the monitored stacks, the owner or operator shall comply with the applicable requirements of paragraphs (a) and (b) of this section, in order to properly determine the NOX mass emissions from the units using that stack; 
            (2) Install, certify, operate, and maintain a NOX-diluent continuous emissions monitoring system and a flow monitoring system in each of the ducts that feed into the stack, and determine NOX mass emissions from the affected unit using the sum of the NOX mass emissions measured at each duct; or 
            (3) If the unit is eligible to use the procedures in appendix D to this part and if the conditions and restrictions of § 75.17(c)(2) are fully met, install, certify, operate, and maintain a NOX-diluent continuous emissions monitoring system in one of the ducts feeding into the stack or in one of the multiple stacks, (as applicable) in accordance with § 75.17(c)(2), and use the procedures in appendix D to this part to determine heat input rate for the unit. 
      (e) Units using a NOX concentration monitoring system and a flow monitoring system to determine NOX mass. 
         The owner or operator may use a NOX concentration monitoring system and a flow monitoring system to determine NOX mass emissions for the cases described in paragraphs (a) through (c) of this section and in paragraph (d)(1) or paragraph (d)(2) of this section (in place of a NOX-diluent continuous emissions monitoring system and a flow monitoring system). However, this option may not be used for the case described in paragraph (d)(3) of this section. When using this approach, calculate NOX mass according to sections 8.2 and 8.3 in appendix F to this part. In addition, if an applicable State or federal NOX mass reduction program requires determination of a unit's heat input, the owner or operator must either: 
            (1) Install, certify, operate, and maintain a CO2 or O2 diluent monitor in the same location as each flow monitoring system. In addition, the owner or operator must provide heat input rate values for each unit utilizing a common stack. The owner or operator may either: 
               (i) Apportion heat input rate from the common stack to each unit according to § 75.16(e)(3), where all units utilizing the common stack are affected units, or 
               (ii) Measure heat input rate to each affected unit, using a flow monitor and a CO2 or O2 diluent monitor in the duct from each affected unit; or 
            (2) For units that are eligible to use appendix D to this part, use the procedures in appendix D to this part to determine heat input rate for the unit. However, the use of a fuel flowmeter in a common pipe header and the provisions of sections 2.1.2.1 and 2.1.2.2 of appendix D to this part are not applicable to any unit that is using the provisions of this subpart to monitor, record, and report NOX mass emissions under a State or federal NOX mass emission reduction program and that shares a common pipe with a nonaffected unit. 
      (f) Procedures for apportioning hourly NOX mass emission rate to the unit level. 
         If the owner or operator of a unit determining hourly NOX mass emission rate at a common stack under this section is subject to a State or federal NOX mass emissions reduction program under subpart GGGGG of part 97 of this chapter or under a state implementation plan approved pursuant to § 52.38(b)(12) of this chapter, then on and after January 1, 2024, solely for purposes of such program, the owner or operator shall apportion the hourly NOX mass emission rate at the common stack to each unit using the common stack based on the ratio of the hourly heat input rate for each such unit to the total hourly heat input rate for all such units, in conjunction with the appropriate unit and stack operating times, according to the procedures in section 8.5.3 of appendix F to this part.
      (g) Procedures for apportioning heat input to the unit level. 
         If the owner or operator of a unit using the common stack monitoring provisions in paragraphs (a) or (b) of this section does not monitor and record heat input at the unit level and the owner or operator is required to do so under an applicable State or federal NOX mass emission reduction program, apportion heat input from the common stack to each unit according to § 75.16(e)(3).
§ 75.73 Recordkeeping and reporting.
   (a) General recordkeeping provisions. 
      The owner or operator of any affected unit shall maintain for each affected unit and each non-affected unit under § 75.72(b)(2)(ii) a file of all measurements, data, reports, and other information required by this part at the source in a form suitable for inspection for at least three (3) years from the date of each record. Except for the certification data required in § 75.57(a)(4) and the initial submission of the monitoring plan required in § 75.57(a)(5), the data shall be collected beginning with the earlier of the date of provisional certification or the compliance deadline in § 75.70(b). The certification data required in § 75.57(a)(4) shall be collected beginning with the date of the first certification test performed. The file shall contain the following information: 
         (1) THE INFORMATION REQUIRED IN §§ 75.57(a)(2), (a)(4), (a)(5), (a)(6), (b), (c)(2), (d), (g), and (h). 
         (2) The information required in §§ 75.58(b)(2) or (b)(3) (for units with add-on NOX emission controls), as applicable, (d) (as applicable for units using Appendix E to this part), and (f) (as applicable for units using the low mass emissions unit provisions of § 75.19). 
         (3) For each hour when the unit is operating, NOX mass emission rate, calculated in accordance with section 8 of appendix F to this part. 
         (4) During the second and third calendar quarters, cumulative ozone season heat input and cumulative ozone season operating hours. 
         (5) Heat input and NOX methodologies for the hour. 
         (6) Specific heat input record provisions for gas-fired or oil-fired units using the procedures in appendix D to this part. 
            In lieu of the information required in § 75.57(c)(2), the owner or operator shall record the information in § 75.58(c) for each affected gas-fired or oil-fired unit and each non-affected gas- or oil-fired unit under § 75.72(b)(2)(ii) for which the owner or operator is using the procedures in appendix D to this part for estimating heat input. 
         (7) Specific NOX record provisions for gas-fired or oil-fired units using the optional low mass emissions excepted methodology in § 75.19. 
            In lieu of recording the information in §§ 75.57(b), (c)(2), (d), and (g), the owner or operator shall record, for each hour when the unit is operating for any portion of the hour, the following information for each affected low mass emissions unit for which the owner or operator is using the low mass emissions excepted methodology in § 75.19(c): 
               (i) Date and hour; 
               (ii) If one type of fuel is combusted in the hour, fuel type (pipeline natural gas, natural gas, residual oil, or diesel fuel) or, if more than one type of fuel is combusted in the hour, the fuel type which results in the highest emission factors for NOX; 
               (iii) Average hourly NOX emission rate (in lb/mmBtu, rounded to the nearest thousandth); and 
               (iv) Hourly NOX mass emissions (in lbs, rounded to the nearest tenth). 
         (8) Formulas from monitoring plan for total NOX mass. 
   (b) Certification, quality assurance and quality control record provisions. 
      The owner or operator of any affected unit shall record the applicable information in § 75.59 for each affected unit or group of units monitored at a common stack and each non-affected unit under § 75.72(b)(2)(ii). 
   (c) Monitoring plan recordkeeping provisions - 
      (1) General provisions. 
         The owner or operator of an affected unit shall prepare and maintain a monitoring plan for each affected unit or group of units monitored at a common stack and each non-affected unit under § 75.72(b)(2)(ii). Except as provided in paragraph (d) or (f) of this section, a monitoring plan shall contain sufficient information on the continuous emission monitoring systems, excepted methodology under § 75.19, or excepted monitoring systems under appendix D or E to this part and the use of data derived from these systems to demonstrate that all the unit's NOX emissions are monitored and reported. 
      (2) Monitoring plan updates.
         Whenever the owner or operator makes a replacement, modification, or change in the certified continuous emission monitoring system, excepted methodology under § 75.19, excepted monitoring system under appendix D or E to this part, or alternative monitoring system under subpart E of this part, including a change in the automated data acquisition and handling system or in the flue gas handling system, that affects information reported in the monitoring plan (e.g., a change to a serial number for a component of a monitoring system), then the owner or operator shall update the monitoring plan. 
      (3) Contents of the monitoring plan. 
         Each monitoring plan shall contain the information in § 75.53(g)(1) in electronic format and the information in § 75.53(g)(2) in hardcopy format. In addition, to the extent applicable, each monitoring plan shall contain the information in § 75.53(h)(1)(i) and (h)(2)(i) in electronic format and the information in § 75.53(h)(1)(ii) and (h)(2)(ii) in hardcopy format. For units using the low mass emissions excepted methodology under § 75.19, the monitoring plan shall include the additional information in § 75.53(h)(4)(i) and (h)(4)(ii). The monitoring plan also shall include a seasonal controls indicator and an ozone season fuel-switching flag. 
   (d) General reporting provisions. 
      (1) The designated representative for an affected unit shall comply with all reporting requirements in this section and with any additional requirements set forth in an applicable State or federal NOX mass emission reduction program that adopts the requirements of this subpart. 
      (2) The designated representative for an affected unit shall submit the following for each affected unit or group of units monitored at a common stack and each non-affected unit under § 75.72(b)(2)(ii): 
         (i) Initial certification and recertification applications in accordance with § 75.70(d); 
         (ii) Monitoring plans in accordance with paragraph (e) of this section; and 
         (iii) Quarterly reports in accordance with paragraph (f) of this section. 
      (3) Other petitions and communications. 
         The designated representative for an affected unit shall submit petitions, correspondence, application forms, and petition-related test results in accordance with the provisions in § 75.70(h). 
      (4) Quality assurance RATA reports. 
         If requested by the permitting authority, the designated representative of an affected unit shall submit the quality assurance RATA report for each affected unit or group of units monitored at a common stack and each non-affected unit under § 75.72(b)(2)(ii) by the later of 45 days after completing a quality assurance RATA according to section 2.3 of appendix B to this part or 15 days of receiving the request. The designated representative shall report the hardcopy information required by § 75.59(a)(9) to the permitting authority. 
      (5) Notifications. 
         The designated representative for an affected unit shall submit written notice to the permitting authority according to the provisions in § 75.61 for each affected unit or group of units monitored at a common stack and each non-affected unit under § 75.72(b)(2)(ii). 
      (6) Routine appendix E retest reports. 
         If requested by the applicable EPA Regional Office, appropriate State, and/or appropriate local air pollution control agency, the designated representative shall submit a hardcopy report within 45 days after completing a required periodic retest according to section 2.2 of appendix E to this part, or within 15 days of receiving the request, whichever is later. The designated representative shall report the hardcopy information required by § 75.59(b)(5) to the applicable EPA Regional Office, appropriate State, and/or appropriate local air pollution control agency that requested the hardcopy report. 
   (e) Monitoring plan reporting - 
      (1) Electronic submission. 
         The designated representative for an affected unit shall submit to the Administrator a complete, electronic, up-to-date monitoring plan file for each affected unit or group of units monitored at a common stack and each non-affected unit under § 75.72(b)(2)(ii), no later than 21 days prior to the initial certification test; at the time of a certification or recertification application submission; and whenever an update of the electronic monitoring plan is required, either under § 75.53 or elsewhere in this part. 
      (2) Hardcopy submission. 
         The designated representative of an affected unit shall submit all of the hardcopy information required under § 75.53, for each affected unit or group of units monitored at a common stack and each non-affected unit under § 75.72(b)(2)(ii), to the permitting authority prior to initial certification. Thereafter, the designated representative shall submit hardcopy information only if that portion of the monitoring plan is revised. The designated representative shall submit the required hardcopy information as follows: no later than 21 days prior to the initial certification test; with any certification or recertification application, if a hardcopy monitoring plan change is associated with the recertification event; and within 30 days of any other event with which a hardcopy monitoring plan change is associated, pursuant to § 75.53(b). Electronic submittal of all monitoring plan information, including hardcopy portions, is permissible provided that a paper copy of the hardcopy portions can be furnished upon request. 
   (f) Quarterly reports - 
      (1) Electronic submission. 
         The designated representative for an affected unit shall electronically report the data and information in this paragraph (f)(1) and in paragraphs (f)(2) and (3) of this section to the Administrator quarterly, unless the unit has been placed in long-term cold storage (as defined in § 72.2 of this chapter). Each electronic report must be submitted to the Administrator within 30 days following the end of each calendar quarter. Each electronic report shall include the information provided in paragraphs (f)(1)(i) through (x) of this section and shall also include the date of report generation. A unit placed into long-term cold storage is exempted from submitting quarterly reports beginning with the calendar quarter following the quarter in which the unit is placed into long-term cold storage, provided that the owner or operator shall submit quarterly reports for the unit beginning with the data from the quarter in which the unit recommences operation (where the initial quarterly report contains hourly data beginning with the first hour of recommenced operation of the unit).
            (i) Facility information: 
               (A) Identification, including: 
                  (1) Facility/ORISPL number; 
                  (2) Calendar quarter and year data contained in the report; and 
                  (3) Electronic data reporting format version used for the report. 
               (B) [Reserved] 
                  
                  
                  
                  
                  
                  
                  
                  
            (ii) The information and hourly data required in paragraphs (a) and (b) of this section, except for: 
               (A) Descriptions of adjustments, corrective action, and maintenance; 
               (B) Information which is incompatible with electronic reporting (e.g., field data sheets, lab analyses, quality control plan); 
               (C) For units with NOX add-on emission controls that do not elect to use the approved site-specific parametric monitoring procedures for calculation of substitute data, the information in § 75.58(b)(3); 
               (D) Information required by § 75.57(h) concerning the causes of any missing data periods and the actions taken to cure such causes; 
               (E) Hardcopy monitoring plan information required by § 75.53 and hardcopy test data and results required by § 75.59; 
               (F) Records of flow polynomial equations and numerical values required by § 75.59(a)(5)(vi); 
               (G) Daily fuel sampling information required by § 75.58(c)(3)(i) for units using assumed values under appendix D to this part; 
               (H) Information required by § 75.59(b)(2) concerning transmitter or transducer accuracy tests; 
               (I) Stratification test results required as part of the RATA supplementary records under § 75.59(a)(7); 
               (J) Data and results of RATAs that are aborted or invalidated due to problems with the reference method or operational problems with the unit and data and results of linearity checks that are aborted or invalidated due to operational problems with the unit; and 
               (K) Supplementary RATA information required under § 75.59(a)(7), except that: 
                  (1) The applicable data elements under § 75.59(a)(7)(ii)(A) through (T) and under § 75.59(a)(7)(iii)(A) through (M) shall be reported for flow RATAs at circular or rectangular stacks (or ducts) in which angular compensation for yaw and/or pitch angles is used (i.e., Method 2F or 2G in appendices A-1 and A-2 to part 60 of this chapter), with or without wall effects adjustments; 
                  (2) The applicable data elements under § 75.59(a)(7)(ii)(A) through (T) and under § 75.59(a)(7)(iii)(A) through (M) shall be reported for any flow RATA run at a circular stack in which Method 2 in appendices A-1 and A-2 to part 60 of this chapter is used and a wall effects adjustment factor is determined by direct measurement; 
                  (3) The data under § 75.59(a)(7)(ii)(T) shall be reported for all flow RATAs at circular stacks in which Method 2 in appendices A-1 and A-2 to part 60 of this chapter is used and a default wall effects adjustment factor is applied; and 
                  (4) The data under § 75.59(a)(7)(ix)(A) through (F) shall be reported for all flow RATAs at rectangular stacks or ducts in which Method 2 in appendices A-1 and A-2 to part 60 of this chapter is used and a wall effects adjustment factor is applied. 
            (iii) Average NOX emission rate (lb/mmBtu, rounded to the nearest thousandth) during the quarter and cumulative NOX emission rate for the calendar year. 
            (iv) Tons of NOX emitted during quarter, cumulative tons of NOX emitted during the year, and, during the second and third calendar quarters, cumulative tons of NOX emitted during the ozone season. 
            (v) During the second and third calendar quarters, cumulative heat input for the ozone season. 
            (vi) Unit or stack or common pipe header operating hours for quarter, cumulative unit, stack or common pipe header operating hours for calendar year, and, during the second and third calendar quarters, cumulative operating hours during the ozone season. 
            (vii) Reporting period heat input. 
            (viii) New reporting frequency and begin date of the new reporting frequency (if applicable). 
            (ix) Starting on January 1, 2024, for a unit subject to subpart GGGGG of part 97 of this chapter or a state implementation plan approved under § 52.38(b)(12) of this chapter and determining NOX mass emission rate at a common stack, apportioned hourly NOX mass emission rate for the unit, lb/hr.
            (x) Starting on January 1, 2024, for a unit subject to a backstop daily NOX emissions rate under subpart GGGGG of part 97 of this chapter or under a state implementation plan approved under § 52.38(b)(12) of this chapter:
               (A) Daily NOX emissions (lbs) for each day of the reporting period;
               (B) Daily heat input (mmBtu) for each day of the reporting period;
               (C) Daily average NOX emissions rate (lb/mmBtu, rounded to the nearest thousandth) for each day of the reporting period;
               (D) Daily NOX emissions (lbs) exceeding the applicable backstop daily NOX emissions rate for each day of the reporting period; and
               (E) Cumulative NOX emissions (tons, rounded to the nearest tenth) exceeding the applicable backstop daily NOX emissions rate during the ozone season.
      (2) Verification of identification codes and formulas.
         The designated representative shall certify that the component and system identification codes and formulas in the quarterly electronic reports submitted to the Administrator pursuant to paragraph (e) of this section represent current operating conditions. 
      (3) Compliance certification. 
         The designated representative shall submit and sign a compliance certification in support of each quarterly emissions monitoring report based on reasonable inquiry of those persons with primary responsibility for ensuring that all of the unit's emissions are correctly and fully monitored. The certification shall state that: 
            (i) The monitoring data submitted were recorded in accordance with the applicable requirements of this part, including the quality assurance procedures and specifications; and 
            (ii) With regard to a unit with add-on emission controls and for all hours where data are substituted in accordance with § 75.34(a)(1), the add-on emission controls were operating within the range of parameters listed in the monitoring plan and the substitute values do not systematically underestimate NOX emissions. 
      (4) Electronic format, method of submission, and explanatory information.
         The designated representative shall comply with all of the quarterly reporting requirements in § 75.64(d), (f), and (g).
§ 75.75 Additional ozone season calculation procedures.
   (a) The owner or operator of a unit that is required to calculate daily or ozone season heat input shall do so by summing the unit's hourly heat input determined according to the procedures in this part for all hours in which the unit operated during the day or ozone season. 
   (b) The owner or operator of a unit that is required to determine daily or ozone season NOX emission rate (in lbs/mmBtu) shall do so by dividing daily or ozone season NOX mass emissions (in lbs) determined in accordance with this subpart, by daily or ozone season heat input determined in accordance with paragraph (a) of this section.

