# 60.4345a How do I demonstrate compliance with my NO emissions standard using a NO CEMS?
(a) Each CEMS measuring NO<sub>X</sub> emissions used to meet the requirements of this subpart, must meet the requirements in paragraphs (a)(1) through (6) of this section.
(1) You must install, certify, maintain, and operate a NO<sub>X</sub> monitor to determine the hourly average NO<sub>X</sub> emissions in the units of the standard with which you are complying.
(2) If you elect to comply with an input-based or mass-based emissions standard, you must install, calibrate, maintain, and operate either a fuel flow meter (or flow meters) or an O<sub>2</sub> or CO<sub>2</sub> CEMS and a stack flow monitor to continuously measure the heat input to the affected facility.
(3) If you elect to comply with an output-based emissions standard, you must also install, calibrate, maintain, and operate both a watt meter (or meters) to continuously measure the gross electrical output from the affected facility and either a fuel flow meter (or flow meters) or an O<sub>2</sub> or CO<sub>2</sub> CEMS and a stack flow monitor. If you have a CHP combustion turbine and elect to comply with an output-based emissions standard, you must also install, calibrate, maintain, and operate meters to continuously determine the total useful recovered thermal energy. For steam this includes flow rate, temperature, and pressure. If you have a direct mechanical drive application and elect to comply with the output-based emissions standard you must submit a plan to the Administrator or delegated authority for approval of how energy output will be determined.
(4) If you elect to comply with the part-load NO<sub>X</sub> emissions standard, you must install, calibrate, maintain, and operate either a fuel flow meter (or flow meters) or an O<sub>2</sub> or CO<sub>2</sub> CEMS and a stack flow monitor to continuously measure the heat input to the affected facility.
(5) If you elect to comply with the temperature dependent NO<sub>X</sub> emissions standard, you must install, calibrate, maintain, and operate a thermometer to continuously monitor the ambient temperature.
(6) If you combust natural gas with fuels other than natural gas and elect to comply with the fuels other than natural gas NO<sub>X</sub> emissions standard, you must install, calibrate, maintain, and operate a device to continuously monitor when a fuel other than natural gas fuel is combusted in the combustion turbine engine.
(b) Each NO<sub>X</sub> CEMS must be installed and certified according to Performance Specification 2 (PS 2) in appendix B to this part. The span value must be 125 percent of the highest applicable standard or highest anticipated hourly NO<sub>X</sub> emissions rate. Alternatively, span values determined according to section 2.1.2 in appendix A to part 75 may be used. For stationary combustion turbines that do not use post-combustion technology to reduce emissions of NO<sub>X</sub> to comply with the requirements of this subpart, you may use NO<sub>X</sub> and diluent CEMS that are installed and certified according to appendix A to part 75 in lieu of Procedure 1 in appendix F to this part and the requirements of § 60.13, except that the relative accuracy test audit (RATA) of the CEMS must be performed on a lb/MMBtu basis. For stationary combustion turbines that use post-combustion technology to reduce emissions of NO<sub>X</sub> to comply with the requirements of this subpart, you may use NO<sub>X</sub> and diluent CEMS that are installed and certified according to appendix A to part 75 in lieu of Procedure 1 in appendix F to this part and the requirements of § 60.13 with approval from the Administrator or delegated authority, except that the relative accuracy test audit (RATA) of the CEMS must be performed on a lb/MMBtu basis.
(c) During each full operating hour, both the NO<sub>X</sub> monitor and the diluent monitor must complete a minimum of one cycle of operation (sampling, analyzing, and data recording) for each 15-minute quadrant of the hour. For partial operating hours, at least one data point must be obtained with each monitor for each quadrant of the hour in which the unit operates. For operating hours in which required quality assurance and maintenance activities are performed on the CEMS, a minimum of two data points (one in each of two quadrants) are required for each monitor.
(d) Each fuel flow meter must be installed, calibrated, maintained, and operated according to the manufacturer's instructions. Alternatively, fuel flow meters that meet the installation, certification, and quality assurance requirements in appendix D to part 75 of this chapter are acceptable for use under this subpart.
(e) Each watt meter, steam flow meter, and each pressure or temperature measurement device must be installed, calibrated, maintained, and operated according to manufacturer's instructions.
(f) You must develop, submit to the Administrator or delegated authority for approval, maintain, and adhere to an on-site quality assurance (QA) plan for all of the continuous monitoring equipment you use to comply with this subpart. At a minimum, such a QA plan must address the requirements of § 60.13(d), (e), and (h). For the CEMS and fuel flow meters, the owner or operator of a stationary combustion turbine that does not use post-combustion technology to reduce emissions of NO<sub>X</sub> to comply with the requirements of this subpart may, with approval of the Administrator or delegated authority, satisfy the requirements of this paragraph (f) by implementing the QA program and plan described in section 1 in appendix B to part 75 of this chapter in lieu of the requirements in § 60.13(d)(1).
(g) At a minimum, non-out-of-control CEMS hourly averages shall be obtained for 90 percent of all operating hours on a 30-operating-day rolling average basis.