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TITLE 30ENVIRONMENTAL QUALITY
PART 1TEXAS COMMISSION ON ENVIRONMENTAL QUALITY
CHAPTER 117CONTROL OF AIR POLLUTION FROM NITROGEN COMPOUNDS
SUBCHAPTER BCOMBUSTION CONTROL AT MAJOR INDUSTRIAL, COMMERCIAL, AND INSTITUTIONAL SOURCES IN OZONE NONATTAINMENT AREAS
DIVISION 2DALLAS-FORT WORTH OZONE NONATTAINMENT AREA MAJOR SOURCES
RULE §117.210Emission Specifications for Attainment Demonstration

(a) Emission specifications. No person shall allow the discharge into the atmosphere emissions in excess of the following emission specifications, except as provided in subsection (d) of this section and §117.203(c) of this title (relating to Exemptions).

  (1) Gas-fired boilers with a maximum rated capacity equal to or greater than 40 million British thermal units per hour, must comply with 30 parts per million by volume (ppmv) nitrogen oxides (NO X ), at 3.0% oxygen (O2 ), dry basis, according to the applicable schedule in §117.9010 of this title (relating to Compliance Schedule for Dallas-Fort Worth Ozone Nonattainment Area Major Sources).

  (2) Gas-fired and dual-fuel, lean-burn, stationary reciprocating internal combustion engines rated 300 horsepower (hp) or greater, must comply with a NOX emission specification of 2.0 grams per horsepower-hour (g/hp-hr) and a carbon monoxide (CO) emission specification of 3.0 g/hp-hr, according to the applicable schedule in §117.9010 of this title.

(b) NOX averaging time. The emission specifications of subsection (a) of this section apply:

  (1) if the unit is operated with a NO X continuous emissions monitoring system (CEMS) or predictive emissions monitoring system (PEMS) under §117.240 of this title (relating to Continuous Demonstration of Compliance), either as:

    (A) a rolling 30-day average period, in the units of the applicable standard;

    (B) a block one-hour average, in the units of the applicable standard, or alternatively;

    (C) a block one-hour average, in pounds per hour, for boilers and process heaters, calculated as the product of the boiler's or process heater's maximum rated capacity and its applicable limit in pounds per million British thermal units; and

  (2) if the unit is not operated with a NO X CEMS or PEMS under §117.240 of this title, a block one-hour average, in the units of the applicable standard. Alternatively for boilers and process heaters, the emission limits may be applied in pounds per hour, as specified in paragraph (1)(C) of this subsection.

(c) Related emissions. No person shall allow the discharge into the atmosphere from any unit subject to NOX emission specifications in subsection (a) of this section, emissions in excess of the following, except as provided in §117.225 of this title (relating to Alternative Case Specific Specifications) or paragraph (3) or (4) of this subsection.

  (1) CO emissions must not exceed 400 ppmv at 3.0% O 2 , dry basis (or alternatively, 3.0 g/hp-hr for stationary internal combustion engines; or 775 ppmv at 7.0% O2 , dry basis for wood fuel-fired boilers or process heaters):

    (A) on a rolling 24-hour averaging period, for units equipped with CEMS or PEMS for CO; and

    (B) on a one-hour average, for units not equipped with CEMS or PEMS for CO.

  (2) For units that inject urea or ammonia into the exhaust stream for NOX control, ammonia emissions must not exceed 10 ppmv at 3.0% O2 , dry, for boilers and process heaters; 15% O2 , dry, for stationary gas turbines and gas-fired lean-burn engines; 7.0% O 2 , dry, for wood-fired boilers; and 3.0% O2 , dry, for all other units, based on:

    (A) a block one-hour averaging period for units not equipped with a CEMS or PEMS for ammonia; or

    (B) a rolling 24-hour averaging period for units equipped with CEMS or PEMS for ammonia.

  (3) The correction of CO emissions to 3.0% O 2 , dry basis, in paragraph (1) of this subsection does not apply to boilers and process heaters operating at less than 10% of maximum load and with stack O2 in excess of 15% (i.e., hot-standby mode).

  (4) The CO specifications in paragraph (1) of this subsection do not apply to stationary internal combustion engines subject to subsection (a)(2) of this section.

(d) Compliance flexibility.

  (1) An owner or operator may use any of the following alternative methods to comply with the NOX emission specifications of this section:

    (A) §117.215 of this title (relating to Alternative Plant-Wide Emission Specifications);

    (B) §117.223 of this title (relating to Source Cap); or

    (C) §117.9800 of this title (relating to Use of Emission Credits for Compliance).

  (2) Section 117.225 of this title is not an applicable method of compliance with the NOX emission specifications of this section.

  (3) An owner or operator may petition the executive director for an alternative to the CO or ammonia emission specifications of this section in accordance with §117.225 of this title.


Source Note: The provisions of this §117.210 adopted to be effective June 14, 2007, 32 TexReg 3206

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