[Code of Federal Regulations]
[Title 40, Volume 14]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR75.30]
[Page 260-261]
TITLE 40--PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
PART 75--CONTINUOUS EMISSION MONITORING--Table of Contents
Subpart D--Missing Data Substitution Procedures
Sec. 75.30 General provisions.
(a) Except as provided in Sec. 75.34, the owner or operator shall
provide substitute data for each affected unit using a continuous
emission monitoring system according to the missing data procedures in
this subpart whenever the unit combusts any fuel and:
(1) A valid, quality-assured hour of SO2 concentration
data (in ppm) has not been measured and recorded for an affected unit by
a certified SO2 pollutant concentration monitor, or by an
approved alternative monitoring method under subpart E of this part,
except as provided in paragraph (d) of this section; or
(2) A valid, quality-assured hour of flow data (in scfh) has not
been measured and recorded for an affected unit from a certified flow
monitor, or by an approved alternative monitoring system under subpart E
of this part; or
(3) A valid, quality-assured hour of NOX emission rate
data (in lb/mmBtu) has not been measured or recorded for an affected
unit, either by a certified NOX-diluent continuous emission
monitoring system or by an approved alternative monitoring system under
subpart E of this part; or
(4) A valid, quality-assured hour of CO2 concentration
data (in percent CO2, or percent O2 converted to
percent CO2 using the procedures in appendix F to this part)
has not been measured and recorded for an affected unit, either by a
certified CO2 continuous emission monitoring system or by an
approved alternative monitoring method under subpart E of this part; or
(5) A valid, quality-assured hour of NOX concentration
data (in ppm) has not been measured or recorded for an affected unit,
either by a certified NOX concentration monitoring system
used to determine NOX mass emissions, as defined in
Sec. 75.71(a)(2), or by an approved alternative monitoring system under
subpart E of this part; or
(6) A valid, quality-assured hour of CO2 or O2
concentration data (in percent CO2, or percent O2)
used for the determination of heat input has not been measured and
recorded for an affected unit, either by a certified CO2 or
O2 diluent monitor, or by an approved alternative monitoring
method under subpart E of this part; or
(7) A valid, quality-assured hour of moisture data (in percent
H2O) has not been measured or recorded for an affected unit,
either by a certified moisture monitoring system or an approved
alternative monitoring method under subpart E of this part. This
requirement does not apply when a default percent moisture value, as
provided in Secs. 75.11(b) or 75.12(b), is used to account for the
hourly moisture content of the stack gas; or
(8) A valid, quality-assured hour of heat input rate data (in mmBtu/
hr) has not been measured and recorded for a unit from a certified flow
monitor and a certified diluent (CO2 or O2)
monitor or by an approved alternative monitoring system under subpart E
of this part.
(b) However, the owner or operator shall have no need to provide
substitute data according to the missing data procedures in this subpart
if the owner or operator uses SO2, CO2,
NOX, or O2 concentration, flow rate, percent
moisture, or NOX emission rate data recorded from either a
certified redundant or regular non-redundant backup CEMS, a like-kind
replacement non-redundant backup analyzer, or a backup reference method
monitoring system when the certified primary monitor is not operating or
is out-of-control. A redundant or non-redundant backup continuous
emission monitoring system must have been certified according to the
procedures in Sec. 75.20 prior to the missing data period. Non-redundant
backup continuous emission monitoring system must pass a linearity check
(for pollutant concentration monitors) or a calibration error test (for
flow monitors) prior to each period of use of the certified backup
monitor for recording and reporting emissions. Use of a certified backup
monitoring system or backup reference method monitoring system is
optional and at the discretion of the owner or operator.
[[Page 261]]
(c) When the certified primary monitor is not operating or out-of-
control, then data recorded for an affected unit from a certified backup
continuous emission monitor or backup reference method monitoring system
are used, as if such data were from the certified primary monitor, to
calculate monitor data availability in Sec. 75.32, and to provide the
quality-assured data used in the missing data procedures in Secs. 75.31
and 75.33, such as the ``hour after'' value.
(d) The owner or operator shall comply with the applicable
provisions of this paragraph during hours in which a unit with an
SO2 continuous emission monitoring system combusts only
gaseous fuel.
(1) Whenever a unit with an SO2 CEMS combusts only
natural gas or pipeline natural gas (as defined in Sec. 72.2 of this
chapter) and the owner or operator is using the procedures in section 7
of appendix F to this part to determine SO2 mass emissions
pursuant to Sec. 75.11(e)(1), the owner or operator shall, for purposes
of reporting heat input data under Sec. 75.57(b)(5), and for the
calculation of SO2 mass emissions using Equation F-23 in
section 7 of appendix F to this part, substitute for missing data from a
flow monitoring system, CO2 diluent monitor or O2
diluent monitor using the missing data substitution procedures in
Sec. 75.36.
(2) Whenever a unit with an SO2 CEMS combusts gaseous
fuel and the owner or operator uses the gas sampling and analysis and
fuel flow procedures in appendix D to this part to determine
SO2 mass emissions pursuant to Sec. 75.11(e)(2), the owner or
operator shall substitute for missing total sulfur content, gross
calorific value, and fuel flowmeter data using the missing data
procedures in appendix D to this part and shall also, for purposes of
reporting heat input data under Sec. 75.54(b)(5) or Sec. 75.57(b)(5), as
applicable, substitute for missing data from a flow monitoring system,
CO2 diluent monitor, or O2 diluent monitor using
the missing data substitution procedures in Sec. 75.36.
(3) The owner or operator of a unit with an SO2
monitoring system shall not include hours when the unit combusts only
gaseous fuel in the SO2 data availability calculations in
Sec. 75.32 or in the calculations of substitute SO2 data
using the procedures of either Sec. 75.31 or Sec. 75.33, for hours when
SO2 emissions are determined in accordance with
Sec. 75.11(e)(1) or (e)(2). For the purpose of the missing data and
availability procedures for SO2 pollutant concentration
monitors in Secs. 75.31 and 75.33 only, all hours during which the unit
combusts only gaseous fuel shall be excluded from the definition of
``monitor operating hour,'' ``quality-assured monitor operating hour,''
``unit operating hour,'' and ``unit operating day,'' when SO2
emissions are determined in accordance with Sec. 75.11(e)(1) or (e)(2).
(4) During all hours in which a unit with an SO2
continuous emission monitoring system combusts only gaseous fuel and the
owner or operator uses the SO2 monitoring system to determine
SO2 mass emissions pursuant to Sec. 75.11(e)(3), the owner or
operator shall determine the percent monitor data availability for
SO2 in accordance with Sec. 75.32 and shall use the standard
SO2 missing data procedures of Sec. 75.33.
[60 FR 26528, 26566, May 17, 1995, as amended at 61 FR 59160, Nov. 20,
1996; 64 FR 28600, May 26, 1999; 67 FR 40433, June 12, 2002]