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TITLE 30ENVIRONMENTAL QUALITY
PART 1TEXAS COMMISSION ON ENVIRONMENTAL QUALITY
CHAPTER 117CONTROL OF AIR POLLUTION FROM NITROGEN COMPOUNDS
SUBCHAPTER GGENERAL MONITORING AND TESTING REQUIREMENTS
DIVISION 2EMISSION MONITORING
RULE §117.8100Emission Monitoring System Requirements for Industrial, Commercial, and Institutional Sources

(a) Continuous emissions monitoring system (CEMS) requirements. When required by this chapter, the owner or operator of any CEMS shall comply with the following.

  (1) Except as specified in paragraph (5) of this subsection, the CEMS must meet the requirements of 40 Code of Federal Regulations (CFR) Part 60 as follows:

    (A) §60.13;

    (B) Appendix B:

      (i) Performance Specification 2, for nitrogen oxides (NOX ) in terms of the applicable standard (in parts per million by volume (ppmv), pounds per million British thermal units (lb/MMBtu), or grams per horsepower-hour (g/hp-hr)). An alternative relative accuracy requirement of ± 2.0 ppmv from the reference method mean value is allowed;

      (ii) Performance Specification 3, for diluent; and

      (iii) Performance Specification 4, for carbon monoxide (CO), for owners or operators electing to use a CO CEMS; and

    (C) after the final applicable compliance date or date of required submittal of CEMS performance evaluation, conduct audits in accordance with §5.1 of Appendix F, quality assurance procedures for NOX , CO, and diluent analyzers, except that a cylinder gas audit or relative accuracy audit may be performed in lieu of the annual relative accuracy test audit (RATA) required in §5.1.1. If the optional alternative relative accuracy requirement of subparagraph (B)(i) of this paragraph (or equivalent) from the reference method mean value is used, then an annual RATA must be performed.

  (2) The owner or operator shall monitor diluent, either oxygen (O2 ) or carbon dioxide (CO 2 ), unless using an exhaust flow meter that meets the flow monitoring specifications of 40 CFR Part 60, Appendix B, Performance Specification 6 or 40 CFR Part 75, Appendix A.

  (3) One CEMS may be shared among units or among multiple exhaust stacks on a single unit, provided:

    (A) the exhaust stream of each stack is analyzed separately; and

    (B) the CEMS meets the certification requirements of paragraph (1) of this subsection for each stack while the CEMS is operating in the time-shared mode.

  (4) Each individual stack must be analyzed separately for units with multiple exhaust stacks.

  (5) As an alternative to paragraph (1) of this subsection, an owner or operator may choose to comply with the CEMS requirements of 40 CFR Part 75 as follows:

    (A) general operation requirements in Subpart B, §75.10(a)(2);

    (B) certification procedures and test methods in Subpart C, §75.20(c) and §75.22;

    (C) recordkeeping requirements of the monitoring plan in Subpart D, §75.53(a) - (c);

    (D) appropriate specifications and test procedures in Appendix A, as follows:

      (i) §1 (Installation and Measurement Location);

      (ii) §2 (Equipment Specifications);

      (iii) §3 (Performance Specifications);

      (iv) §4 (Data Acquisition and Handling Systems);

      (v) §5 (Calibration Gas);

      (vi) §6 (Certification Tests and Procedures); and

      (vii) meet either the relative accuracy requirement of 40 CFR Part 75 in percentage only, or the alternative relatively accuracy requirement of ± 2.0 ppmv from the reference method mean value; and

    (E) appropriate quality assurance/quality control procedures in Appendix B, as follows:

      (i) §1 (Quality Assurance/Quality Control Program); and

      (ii) §2 (Frequency of Testing).

  (6) The CEMS is subject to the approval of the executive director.

(b) Predictive emissions monitoring system (PEMS) requirements. When required by this chapter, the owner or operator of any PEMS shall comply with the following.

  (1) The owner or operator shall monitor diluent, either O2 or CO2 :

    (A) using a CEMS:

      (i) in accordance with subsection (a)(1)(B)(ii) of this section; or

      (ii) with a similar alternative method approved by the executive director and the United States Environmental Protection Agency; or

    (B) using a PEMS.

  (2) Any PEMS must meet the requirements of 40 CFR Part 75, Subpart E, except as provided in paragraphs (3) and (4) of this subsection.

  (3) The owner or operator may vary from 40 CFR Part 75, Subpart E if the owner or operator:

    (A) demonstrates to the satisfaction of the executive director and the United States Environmental Protection Agency that the alternative is substantially equivalent to the requirements of 40 CFR Part 75, Subpart E; or

    (B) demonstrates to the satisfaction of the executive director that the requirement is not applicable.

  (4) The owner or operator may substitute the following as an alternative to the test procedure of Subpart E for any unit:

    (A) perform the following alternative initial certification tests:

      (i) conduct initial RATA at low, medium, and high levels of the key operating parameter affecting NOX using 40 CFR Part 60, Appendix B:

        (I) Performance Specification 2, subsection 13.2, pertaining to NOX , in terms of the applicable standard (in ppmv, lb/MMBtu, or g/hp-hr). An alternative relative accuracy requirement of ± 2.0 ppmv from the reference method mean value is allowed;

        (II) Performance Specification 3, subsection 13.2, pertaining to O2 or CO2 ; and

        (III) Performance Specification 4, subsection 13.2, pertaining to CO, for owners or operators electing to use a CO PEMS; and

      (ii) conduct an F-test, a t-test, and a correlation analysis using 40 CFR Part 75, Subpart E at low, medium, and high levels of the key operating parameter affecting NOX :

        (I) calculations must be based on a minimum of 30 successive emission data points at each tested level that are either 15-minute, 20-minute, or hourly averages;

        (II) the F-test must be performed separately at each tested level;

        (III) the t-test and the correlation analysis must be performed using all data collected at the three tested levels;

        (IV) waivers from the statistical tests and default reference method standard deviation values for the F-test may be allowed according to the TNRCC PEMS Protocol Draft, May 16, 1994;

        (V) the correlation analysis may only be temporarily waived following review of the waiver request submittal if:

          (-a-) the process design is such that it is technically impossible to vary the process to result in a concentration change sufficient to allow a successful correlation analysis statistical test. Any waiver request must also be accompanied with documentation of the reference method measured concentration, and documentation that it is less than 50% of the emission limit or standard. The waiver must be based on the measured value at the time of the waiver. Should a subsequent RATA effort identify a change in the reference method measured value by more than 30%, the statistical test must be repeated at the next RATA effort to verify the successful compliance with the correlation analysis statistical test requirement; or

          (-b-) the data for a measured compound (e.g., NO X , O2 ) are determined to be autocorrelated according to the procedures of 40 CFR §75.41(b)(2). A complete analysis of autocorrelation with support information must be submitted with the request for waiver. The statistical test must be repeated at the next RATA effort to verify the successful compliance with the correlation analysis statistical test requirement; and

        (VI) all requests for waivers must be submitted to the executive director for review. The executive director shall approve or deny each waiver request;

    (B) further demonstrate PEMS accuracy and precision for at least one unit of a category of equipment by performing RATA and statistical testing in accordance with subparagraph (A) of this paragraph for each of three successive quarters, beginning:

      (i) no sooner than the quarter immediately following initial certification; and

      (ii) no later than the first quarter following the final compliance date; and

    (C) after the final applicable compliance date, perform RATA for each unit:

      (i) at normal load operations;

      (ii) using the Performance Specifications of subparagraph (A)(i)(I) - (III) of this paragraph; and

      (iii) at the following frequency:

        (I) semiannually; or

        (II) annually, if following the first semiannual RATA, the relative accuracy during the previous audit for each compound monitored by PEMS is less than or equal to 7.5% (or within ± 2.0 ppmv) of the mean value of the reference method test data at normal load operation; or alternatively:

          (-a-) for diluent, is no greater than 1.0% O 2 or CO2 , for diluent measured by reference method at less than 5% by volume; or

          (-b-) for CO, is no greater than 5.0 ppmv.

  (5) The owner or operator shall, for each alternative fuel fired in a unit, certify the PEMS in accordance with paragraph (4)(A) of this subsection unless the alternative fuel effects on NO X , CO, and O2 (or CO 2 ) emissions were addressed in the model training process.

  (6) The PEMS is subject to the approval of the executive director.

(c) Monitoring system certification reports. Reports of any RATA performed in accordance with this section must comply with §117.8010 of this title (relating to Compliance Stack Test Reports).


Source Note: The provisions of this §117.8100 adopted to be effective June 14, 2007, 32 TexReg 3206

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