(a) Grandfathered or electing electric generating facilities (EGF) subject to 40 Code of Federal Regulations Part 75, effective June 25, 1999 (40 CFR Part 75) shall do the following.
  (1) For grandfathered or electing EGFs subject to the requirements of 40 CFR Part 75, concerning Continuous Emission Monitoring, all monitoring systems must comply with the initial performance testing and periodic calibration, accuracy testing, and quality assurance/quality control testing specified in 40 CFR Part 75.
  (2) For grandfathered and electing EGFs subject to 40 CFR Part 75, a certified monitoring system under 40 CFR Part 75 shall be used to demonstrate compliance with this subchapter.
    (A) If the grandfathered or electing EGF has a flow monitor certified under 40 CFR Part 75, nitrogen oxides (NO x) emissions in pounds per hour shall be determined using a NOx continuous emission monitoring system (CEMS) and the flow monitor.
    (B) If the grandfathered or electing EGF does not have a certified flow monitor, but does have a NOx CEMS, NOx emissions in pounds per hour shall be determined by multiplying pounds of NOx per million British thermal units (lbs/MMBtu) times heat input in MMBtu per hour (MMBtu/hr). The procedures in 40 CFR Part 75, Appendix F, concerning Conversion Procedures, Section 3, shall be used to convert the measured concentration of NOx and a diluent (carbon dioxide (CO 2) or oxygen (O2)) into an emission rate in lbs/MMBtu. The procedures in 40 CFR Part 75, Appendix F, Section 5, shall be used to determine the hourly heat input in MMBtu/hr. These two values (lbs/MMBtu and MMBtu/hr) shall be multiplied together to determine NO x emissions in lbs/hr.
    (C) The procedures in 40 CFR Part 75, Appendix E, concerning Optional NOx Emissions Estimation Protocol for Gas-fired Peaking Units and Oil-fired Peaking Units, may be used to estimate the NOx emission rate.
(b) Grandfathered or electing EGFs not subject to 40 CFR Part 75 shall comply with:
  (1) the initial performance testing and periodic calibration, accuracy testing, and quality assurance/quality control testing specified in 40 CFR Part 75; or
  (2) those same requirements in 40 CFR Part 60, concerning New Source Performance Standards (40 CFR Part 60). Actual emissions must be determined by multiplying the CEMs data by an adjustment factor of 1.1 for all grandfathered and electing EGFs not using a 40 CFR Part 75 monitoring system if the CEMs exceeds 10% relative accuracy.
  (3) in lieu of the monitoring required by paragraph (1) or (2) of this subsection, the electric generating facility permit (EGFP) may authorize alternative monitoring to calculate mass emissions under this section. The applicant must submit the following for review of an alternative monitoring proposal:
    (A) a description of the monitoring approach to be used;
    (B) a description of the major components of the monitoring system, including the manufacturer, serial number of the component, the measurement span of the component, and documentation to demonstrate that the measurement span of each component is appropriate to measure all of the expected values;
    (C) an estimate of the accuracy of the system and documentation to demonstrate how the estimate of accuracy was determined;
    (D) a description of the tests that will be used for initial certification, initial quality assurance, periodic quality assurance, and relative accuracy; and
    (E) additional information may be requested before approving a request for alternative monitoring. Alternative monitoring shall be incorporated into the EGFP.
  (4) emissions in pounds per hour shall be determined using the NOxCEMS and one of the following methods.
    (A) The owner or operator may elect to comply with subsection (a)(2)(A) or (B) of this section.
    (B) The grandfathered or electing EGF may use a flow monitor certified under 40 CFR Part 60 to determine emissions in pounds per hour.
    (C) NOx emissions in pounds per hour may be determined by multiplying the lbs/MMBtu times the heat input in MMBtu/hr. The procedures in 40 CFR Part 60, Appendix A, Method 19 shall be used to convert the measured concentration of NOx and a diluent (CO2 or O 2) into emission rates in lbs/MMBtu. The procedures in 40 CFR Part 75, Section 5, Appendix F shall be used to determine the hourly heat input in MMBtu/hr. These two values (lbs/MMBtu and MMBtu/hr) shall be multiplied together to determine NOx emissions in lbs/hr;
  (5) for grandfathered and electing EGFs with a heat input of less than 100 MMBtu/hr and for peaking units emissions in pounds per hour, may be determined using the procedures in Appendix E of 40 CFR Part 75 to estimate the emission rate.
(c) The following requirements apply to all grandfathered and electing EGFs.
  (1) During a period when valid data is not being recorded by monitoring devices approved for use to demonstrate compliance with this subchapter, missing or invalid data shall be replaced with representative default data in accordance with the provisions of 40 CFR Part 75, Subpart D, concerning Missing Data Substitution Procedures.
  (2) Data collected from monitoring of grandfathered and electing EGFs shall be used to calculate the actual emissions over a control period. The information in this report shall be submitted by June 30 of each year and may be submitted with the report required under §101.336(b) of this title (relating to Emission Monitoring, Compliance Demonstration, and Reporting). At a minimum, the report shall contain the following information:
    (A) a description of the monitoring protocol;
    (B) a completed Form AR-1, Emissions Monitoring Data Form;
    (C) other information as necessary to validate the actual emissions during the prior control period, including, but not limited to, periodic calibration results and maintenance logs.

Source Note: The provisions of this §116.914 adopted to be effective January 11, 2000, 25 TexReg 185