| (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 §117.9110
of this title (relating to Compliance Schedule for Bexar County Ozone
Nonattainment Area Utility Electric Generation Sources):
(1) stationary gas turbines, including duct burners
used in turbine exhaust ducts, 0.032 pound per million British thermal
units (lb/MMBtu) heat input on a rolling 30-day average basis;
(2) utility boilers or auxiliary steam boilers, while
firing natural gas or a combination of natural gas and oil, 0.20 lb/MMBtu
heat input on a rolling 30-day average basis;
(3) utility boilers or auxiliary steam boilers controlled
with selective catalytic reduction, while firing coal, 0.069 lb/MMBtu
heat input on a rolling 30-day average basis;
(4) utility boilers or auxiliary steam boilers not
controlled with selective catalytic reduction, while firing coal,
0.20 lb/MMBtu heat input on a rolling 30-day average basis; and
(5) utility boilers or auxiliary steam boilers, while
firing oil only, 0.30 lb/MMBtu heat input on an hourly basis.
(b) Compliance flexibility. An owner or operator may
use any of the following alternative methods to comply with the NOX emission specifications of this section:
(1) §117.1120 of this title (relating to System
Cap); or
(2) §117.9800 of this title (relating to Use of
Emission Credits for Compliance).
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