| (a) Emission specifications. No person shall allow
the discharge into the atmosphere nitrogen oxides (NOX ) emissions in excess of the following emission
specifications, in accordance with the applicable schedule in §117.9010
of this title (relating to Compliance Schedule for Bexar County Ozone
Nonattainment Area Major Sources), except as provided in subsection
(c) of this section:
(1) stationary gas turbines, 0.55 pound per million
British thermal unit (lb/MMBtu);
(2) duct burners used in turbine exhaust ducts, 0.55
lb/MMBtu; and
(3) gas-fired lean-burn stationary reciprocating internal
combustion engines, 0.5 gram per horsepower-hour.
(b) NOX averaging time.
The emission specifications in subsection (a) of this section apply
on:
(1) a block one-hour average, in the units of the applicable
standard; or
(2) if the unit is operated with a NOX continuous emissions monitoring system (CEMS)
or predictive emissions monitoring system (PEMS) under §117.240
of this title (relating to Continuous Demonstration of Compliance),
a rolling 30-day average, in the units of the applicable standard.
(c) Compliance flexibility. An owner or operator may
use §117.9800 of this title (relating to Use of Emission Credits
for Compliance) to comply with the NOX emission
specifications of this section.
(d) Prohibition of circumvention.
(1) The maximum rated capacity used to determine the
applicability of the emission specifications in this section and the
initial compliance demonstration, monitoring, testing requirements,
and control plan requirements in §§117.235, 117.240, and
117.252 of this title (relating to Initial Demonstration of Compliance;
Continuous Demonstration of Compliance; and Control Plan Procedures
for Reasonably Available Control Technology) must be the greater of
the following:
(A) the maximum rated capacity as of December 31, 2019;
(B) the maximum rated capacity after December 31, 2019;
or
(C) the maximum rated capacity authorized by a permit
issued under Chapter 116 of this title (relating to Control of Air
Pollution by Permits for New Construction or Modification) after December
31, 2019.
(2) A unit's classification is determined by the most
specific classification applicable to the unit as of December 31,
2019. For example, a unit that is classified as a gas-fired lean-burn
stationary reciprocating internal combustion engine as of December
31, 2019, but subsequently is authorized to operate as a dual-fuel
engine, is classified as a gas-fired lean-burn stationary reciprocating
internal combustion engine for the purposes of this chapter.
(3) A source that met the definition of major source
on December 31, 2019, is always classified as a major source for purposes
of this chapter. A source that did not meet the definition of major
source (i.e., was a minor source, or did not yet exist) on December
31, 2019, but becomes a major source at any time after December 31,
2019, is from that time forward always classified as a major source
for purposes of this chapter.
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