SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 260.13 - MONITORING REQUIREMENTS
(Rev. Effective: 3/27/90)
(a) Unless otherwise approved by the Control Officer or specified in applicable subparts, the requirements of this
rule shall apply to all continuous monitoring systems required under applicable subparts.
(b) All continuous monitoring systems and monitoring devices shall be installed and operational prior to conducting
performance tests under Rule 260.8. Verification of operational status shall, as a minimum, consist of the following:
- For continuous monitoring systems referenced in Subsection (c)(1) of this rule, completion of the conditioning
period specified by applicable requirements in Appendix B to 40 CFR Part 60.
- For continuous monitoring systems referenced in Subsection (c)(2) of this rule, completion of seven days of
- For monitoring devices referenced in applicable subparts, completion of the manufacturer's written requirements
or recommendations for checking the operation or calibration of the device.
(c) If the owner or operator of an affected facility elects to submit continous opacity monitoring system (COMS)
data for compliance with the opacity standard as provided under Rule 260.11(e)(5), he shall conduct a perfomance
evaluation of the COMS as specified in Performance Specification 1, Appendix B of 40 CFR Part 60 before the performance
test required under Rule 260.8 is conducted. Otherwise, the owner or operator of an affected facility shall conduct
a performance evaluation of the COMS or continous emission monitoring system (CEMS) during any performance test
required under Rule 260.8 or within 30 days thereafter in accordance with the applicable performance specification
in Appendix B of 40 CFR Part 60, the owner or operator of an affected facility shall conduct COMS or CEMS performance
evaluations at such other times as may be required by the Control Officer under Section 114 of the Act.
- The owner or operator of an affected facility using a COMS to determine opacity compliance during any performance
test required under Rule 260.8 and as described in Rule 260.11(e)(5) shall furnish the Control Officer two or,
upon request, more copies of a written report of the results of the COMS performance evaluation described in Section
(c) of this rule at least 10 days before the performance test required under Rule 260.8 is conducted.
- Except as provided in Subsection (c)(1) of this rule, the owner or operator of an affected facility shall furnish
the Control Officer within 60 days of completion two or, upon request, more copies of a written report of the results
of the performance evaluation.
(d) Owners or operators of all continuous monitoring systems installed in accordance with the provisions of
this regulation shall check the zero and span drift at least once daily in accordance with the method prescribed
by the manufacturer of such systems unless the manufacturer recommends adjustments at shorter intervals, in which
case such recommendations shall be followed. The zero and span shall, as a minimum, be adjusted whenever the 24-hour
zero drift or 24-hour calibration drift limits of the applicable performance specifications in Appendix B to 40
CFR Part 60 are exceeded. For continuous monitoring systems measuring opacity of emissions, the optical surfaces
exposed to the effluent gases shall be cleaned prior to performing the zero or span drift adjustments except that
for systems using automatic zero adjustments, the optical surfaces shall be cleaned when the cumulative automatic
zero compensation exceeds four percent opacity. Unless otherwise approved by the Control Officer, the following
procedures, as applicable, shall be followed:
- For extractive continuous monitoring systems measuring gases, minimum procedures shall include introducing
applicable zero and span gas mixtures into the measurement system as near the probe as is practical. Span and zero
gases certified by their manufacturer to be traceable to National Bureau of Standards reference gases shall be
used whenever these reference gases are available. The span and zero gas mixtures shall be the same composition
as specified in Appendix B to 40 CFR Part 60. Every six months from date of manufacture, span and zero gases shall
be reanalyzed by conducting triplicate analyses with Reference Methods 6 for SO2, 7 for NOx, and 3 for
O2 and CO2, respectively. The gases may be analyzed at less frequent intervals if longer
shelf lives are guaranteed by the manufacturer.
- For non-extractive continuous monitoring systems measuring gases, minimum procedures shall include upscale
check(s) using a certified calibration gas cell or test cell which is functionally equivalent to a known gas concentration.
The zero check may be performed by computing the zero value from upscale measurements or by mechanically producing
a zero condition.
- For continuous monitoring systems measuring opacity of emissions, minimum procedures shall include a method
for producing a simulated zero opacity condition and an upscale (span) opacity condition using a certified neutral
density filter or other related technique to produce a known obscuration of the light beam. Such procedures shall
provide a system check of the analyzer internal optical surfaces and all electronic circuitry including the lamp
and photodetector assembly.
(e) Except for system breakdowns, repairs, calibration checks, and zero and span adjustments required under
Section (d) of this rule, all continuous monitoring systems shall be in continuous operation and shall meet minimum
frequency of operation requirements as follows:
- All continuous monitoring systems referenced by Subsections (c)(1) and (2) of this rule for measuring opacity
of emissions shall complete a minimum of one cycle of operation (sampling, analyzing, and data recording) for each
successive 10-second period.
- All continuous monitoring systems referenced by Subsection (c)(1) of this rule for measuring oxides of nitrogen,
sulfur dioxide, carbon dioxide, or oxygen shall complete a minimum of one cycle of operation (sampling, analyzing,
and data recording) for each successive 15-minute period.
- All continuous monitoring systems referenced by Subsection (c)(2) of this rule, except opacity, shall complete
a minimum of one cycle of operation (sampling, analyzing, and data recording) for each successive one-hour period.
(f) All continuous monitoring systems or monitoring devices shall be installed such that representative measurements
of emissions or process parameters from the affected facility are obtained. Additional procedures for location
of continuous monitoring systems contained in the applicable Performance Specifications of Appendix B to 40 CFR
Part 60 shall be used.
(g) When the effluents from a single affected facility or two or more affected facilities subject to the same
emission standards are combined before being released to the atmosphere, the owner or operator may install applicable
continuous monitoring systems on each effluent or on the combined effluent. When the affected facilities are not
subject to the same emission standards, separate continuous monitoring systems shall be installed on each effluent.
When the effluent from one affected facility is released to the atmosphere through more than one point, the owner
or operator shall install applicable continuous monitoring systems on each separate effluent unless the installation
of fewer systems is approved by the Control Officer.
(h) Owners or operators of all continuous monitoring systems for measurement of opacity shall reduce all data
to six-minute averages and for systems other than opacity to one-hour averages for time periods under Rule 260.2(x)
and (r) respectively. Six-minute opacity averages shall be calculated from 24 or more data points equally spaced
over each six-minute period. For systems other than opacity, one-hour averages shall be computed from four or more
data points equally spaced over each one-hour period. Data recorded during periods of system breakdowns, repairs,
calibration checks, and zero and span adjustments shall not be included in the data averages computed under this
section. An arithmetic or integrated average of all data may be used. The data output of all continuous monitoring
systems may be recorded in reduced or nonreduced form (e.g., ppm pollutant and percent 02 or lb/million
Btu of pollutant). All excess emissions shall be converted into units of the standard using the applicable conversion
procedures specified in subparts. After conversion into units of the standard, the data may be rounded to the same
number of significant digits used in subparts to specify the applicable standard (e.g., rounded to the nearest
one percent opacity).
(i) Upon written application by an owner or operator, the Administrator may approve alternatives to any monitoring
procedures or requirements of this regulation including, but not limited to the following: (Rev. Effect. 1/13/87)
- Alternative monitoring requirements when installation of a continuous monitoring system or monitoring device
specified by this regulation would not provide accurate measurements due to liquid water or other interferences
caused by substances with the effluent gases.
- Alternative monitoring requirements when the affected facility is infrequently operated.
- Alternative monitoring requirements to accommodate continuous monitoring systems that require additional measurements
to correct for stack moisture conditions.
- Alternative locations for installing continuous monitoring systems or monitoring devices when the owner or
operator can demonstrate that installation at alternate locations will enable accurate and representative measurements.
- Alternative methods of converting pollutant concentration measurements to units of the standards.
- Alternative procedures for performing daily checks of zero and span drift that do not involve use of span gases
or test cells.
- Alternatives to the ASTM test methods or sampling procedures specified by any subpart.
- Alternative continuous monitoring systems that do not meet the design or performance requirements in Performance
Specification 1, Appendix B to 40 CFR Part 60, but adequately demonstrate a definite and consistent relationship
between its measurements and the measurements of opacity by a system complying with the requirements in Performance
Specification 1. The Control Officer may require that such demonstration be performed for each affected facility.
- Alternative monitoring requirements when the effluent from a single affected facility or the combined effluent
from two or more affected facilities are released to the atmosphere through more than one point.
(j) An alternative to the Relative Accuracy (RA) test specified in Performance Specification 2 of Appendix B
of 40 CFR Part 60 may be requested as follows: (Rev. Effect. 3/27/90)
- An alternative to the reference method tests for determining relative accuracy is available for sources with
emission rates demonstrated to be less than 50 percent of the applicable standard. A source owner or operator may
petition the Administrator to waive the relative accuracy test in Section 7 of Performance Specification 2 and
substitute the procedures in Section 10 if the results of a performance test conducted according to the requirements
in Rule 260.8 of this Regulation or other tests performed following the criteria in Rule 260.8 demonstrate that
the emission rate of the pollutant of interest in the units of the applicable standard is less than 50 percent
of the applicable standard. For sources subject to standards expressed as control efficiency levels, as source
owner or operator may petition the Administrator to waive the relative accuracy test and substitute the procedures
in Section 10 pf Performance Specification 2 if the control device exhaust emission rate is less than 50 percent
of the level needed to meet the control efficiency requirement. The alternative procedures do not apply if the
continuous emission monitoring system is used to determine compliance continuously with the applicable standard.
The petition to waive the relative accuracy test shall include a detailed description of the procedures to be applied.
Included shall be location and procedure for conducting the alternative, the concentration or response levels of
the alternative RA materials, and the other equipment checks included in the alternative procedure. The Administrator
will review the petition for completeness and applicability. The determination to grant a waiver will depend on
the intended use of the CEMS data (e.g., data collection purposes other than NSPS) and may require specifications
more stringent than in Performance Specification 2 (e.g., the applicable emission limit is more stringent than
- The waiver of a CEMS relative accuracy test will be reviewed and may be rescinded at such time following successful
completion of the alternative RA procedure that the CEMS data indicate the source emissions approaching the level
of the applicable standard. The criterion for reviewing the waiver is the collection of CEMS data showing that
emissions have exceeded 70 percent of the applicable standard for seven consecutive, averaging periods as specified
by the applicable rule(s). For sources subject to standards expressed as control efficiency levels, the criterion
for reviewing the waiver is the collection of CEMS data showing that exhaust emissions have exceeded 70 percent
of the level needed to meet the control efficiency requirement for seven, consecutive, averaging periods as specified
by the applicable rule(s), (e.g., Part 60, Chapter I, Title 40, Code of Federal Regulations, Sections 60.45(g)(2)
and (3), 60.73(e) and 60.84(e)). It is the responsibility of the source operator to maintain records and determine
the level of emissions relative to the criterion on the waiver of relative accuracy testing. If this criterion
is exceeded, the owner or operator must notify the Control Officer and the Administrator within 10 days of such
occurrence and include a description of the nature and cause of the increasing emissions. The Administrator and/or
the Control Officer will review the notification and either may rescind the waiver and require the owner or operator
to conduct a relative accuracy test of the CEMS as specified in Section 7 of Performance Specification 2.