| (a) Totalizing fuel flow meters.
(1) The owner or operator of units subject to this
division shall install, calibrate, maintain, and operate a totalizing
fuel flow meter, with an accuracy of ± 5%, to individually
and continuously measure the gas and liquid fuel usage. A computer
that collects, sums, and stores electronic data from continuous fuel
flow meters is an acceptable totalizer. The owner or operator must
continuously operate the totalizing fuel flow meter at least 95% of
the time when the unit is operating during a calendar year. For the
purpose of compliance with this subsection for units having pilot
fuel supplied by a separate fuel system or from an unmonitored portion
of the same fuel system, the fuel flow to pilots may be calculated
using the manufacturer's design flow rates rather than measured with
a fuel flow meter. The calculated pilot fuel flow rate must be added
to the monitored fuel flow when fuel flow is totaled.
(2) The following are alternatives to the fuel flow
monitoring requirements of this subsection.
(A) Units operating with a nitrogen oxides (NOX ) and diluent continuous emissions monitoring
system (CEMS) under subsection (c) of this section may monitor stack
exhaust flow using the flow monitoring specifications of 40 Code of
Federal Regulations (CFR) Part 60, Appendix B, Performance Specification
6 or 40 CFR Part 75, Appendix A.
(B) Units that vent to a common stack with a NOX and diluent CEMS under subsection (c) of
this section may use a single totalizing fuel flow meter.
(C) Gas-fired lean-burn stationary reciprocating internal
combustion engines and gas turbines equipped with a continuous monitoring
system that continuously monitors horsepower and hours of operation
are not required to install totalizing fuel flow meters. The continuous
monitoring system must be installed, calibrated, maintained, and operated
according to manufacturers' recommended procedures.
(b) NOX monitors.
(1) The owner or operator of the following units shall
install, calibrate, maintain, and operate a CEMS or predictive emissions
monitoring system (PEMS) to monitor exhaust NOX :
(A) units with a rated heat input greater than or equal
to 100 million British thermal units (MMBtu) per hour;
(B) stationary gas turbines with a megawatt (MW) rating
greater than or equal to 30 MW and operated more than 850 hours per
year;
(C) units that use a chemical reagent for reduction
of NOX ; and
(D) units that the owner or operator elects to comply
with the NOX emission specifications
of §117.205(a) of this title (relating to Emission Specifications
for Reasonably Available Control Technology (RACT)) using a pound
per MMBtu limit on a 30-day rolling average.
(2) Units subject to the NOX CEMS
requirements of 40 CFR Part 75 are not required to install CEMS or
PEMS under this subsection.
(3) The owner or operator shall use one of the following
methods to provide substitute emissions compliance data during periods
when the NOX monitor is off-line:
(A) if the NOX monitor
is a CEMS:
(i) subject to 40 CFR Part 75, use the missing data
procedures specified in 40 CFR Part 75, Subpart D (Missing Data Substitution
Procedures); or
(ii) subject to 40 CFR Part 75, Appendix E, use the
missing data procedures specified in 40 CFR Part 75, Appendix E, §2.5
(Missing Data Procedures);
(B) if the NOX monitor
is a PEMS:
(i) use the methods specified in 40 CFR Part 75, Subpart
D; or
(ii) use calculations in accordance with §117.8110(b)
of this title (relating to Emission Monitoring System Requirements
for Utility Electric Generation Sources);
(C) monitor operating parameters for each unit in accordance
with 40 CFR Part 75, Appendix E, §1.1 or §1.2 and calculate
NOX emission rates based on those procedures;
or
(D) use the maximum block one-hour emission rate as
measured during the initial demonstration of compliance required in §117.235(e)
of this title (relating to Initial Demonstration of Compliance).
(c) CEMS requirements. The owner or operator of any
CEMS used to meet a pollutant monitoring requirement of this section
shall comply with the requirements of §117.8100(a) of this title
(relating to Emission Monitoring System Requirements for Industrial,
Commercial, and Institutional Sources).
(d) PEMS requirements. The owner or operator of any
PEMS used to meet a pollutant monitoring requirement of this section
shall comply with the following.
(1) The PEMS must predict the pollutant emissions in
the units of the applicable emission limitations of this division.
(2) The PEMS must meet the requirements of §117.8100(b)
of this title.
(e) Engine monitoring. The owner or operator of any
gas-fired lean-burn stationary reciprocating internal combustion engine
subject to the emission specifications of this division shall stack
test engine NOX emissions as specified
in §117.8140(a) of this title (relating to Emission Monitoring
for Engines).
(f) Run time meters. The owner or operator of any stationary
gas turbine or gas-fired lean-burn stationary reciprocating internal
combustion engine claimed exempt using the exemption of §117.203(1)(D)
of this title (relating to Exemptions) shall record the operating
time with a non-resettable elapsed run time meter.
(g) Data used for compliance. After the initial demonstration
of compliance required by §117.235 of this title, the methods
required in this section must be used to determine compliance with
the emission specifications of §117.205(a) of this title. For
enforcement purposes, the executive director may also use other commission
compliance methods to determine whether the unit is in compliance
with applicable emission specifications.
(h) Testing requirements.
(1) The owner or operator of units that are subject
to the emission specifications of §117.205(a) of this title shall
test the units as specified in §117.235 of this title in accordance
with the applicable schedule specified in §117.9010 of this title
(relating to Compliance Schedule for Bexar County Eight-Hour Ozone
Nonattainment Area Major Sources).
(2) The owner or operator of any unit not equipped
with CEMS or PEMS that are subject to the emission specifications
of §117.205(a) of this title shall retest the unit as specified
in §117.235 of this title within 60 days after any modification
that could reasonably be expected to increase the NOX emission rate.
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