Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 2 - DEPARTMENT OF ENVIRONMENTAL - QUALITY AIR POLLUTION CONTROL › APPENDICES › Appendix 9 - Monitoring Requirements

Current through Register Vol. 30, No. 28, July 12, 2024
A9.1. Unless otherwise approved by the Director or specified
				  in applicable Sections, the requirements of this Appendix shall apply to all
				  continuous monitoring systems required under applicable Sections.
A9.2. All continuous monitoring systems and monitoring
				  devices shall be installed and operational prior to conducting performance
				  tests under rule
				  R18-2-312.
				  Verification of operational status shall, as a minimum, consist of the
				  following:
A9.2.1. For continuous monitoring systems referenced in
				  A9.3.1. below, completion of the conditioning period specified by applicable
				  requirements in the Arizona Testing Manual and 40 CFR 60.
A9.2.2. For continuous monitoring systems referenced in
				  A9.3.2. below, completion of seven days of operation.
A9.2.3. For monitoring devices referenced in other applicable
				  Sections, completions of the manufacturer's written requirements or
				  recommendations for checking the operation or calibration of the device.
A9.3. During any performance tests required under rule
				  R18-2-312 or within 30 days thereafter and at such other times as may be
				  required by the Director, the owner or operator of any affected facility shall
				  conduct continuous monitoring system performance evaluations and furnish the
				  Director within 60 days thereof, 2, or upon request, more copies of a written
				  report of the results of such tests. The continuous monitoring system
				  performance evaluations shall be conducted in accordance with the following
				  specifications and procedures:
A9.3.1. Continuous monitoring systems listed within this
				  subsection, except as provided in A9.3.2. below shall be evaluated in
				  accordance with the requirements and procedures contained in the applicable
				  performance specification of the Arizona Testing Manual and 40 CFR 60.
A9.3.1.1. Continuous monitoring systems for measuring opacity
				  of emissions shall comply with Performance Specification 1.
A9.3.1.2. Continuous monitoring systems for measuring
				  nitrogen oxides emissions shall comply with Performance Specification 2.
A9.3.1.3. Continuous monitoring systems for measuring sulfur
				  dioxide emissions shall comply with Performance Specification 2.
A9.3.1.4. Continuous monitoring systems for measuring the
				  oxygen content or carbon dioxide content of effluent gases shall comply with
				  Performance Specification 3.
A9.3.2. An owner or operator who, prior to September 11,
				  1974, entered into a binding contractual obligation to purchase specific
				  continuous monitoring system components except as referenced by A9.3.2.3. below
				  shall comply with the following requirements:
A9.3.2.1. Continuous monitoring systems for measuring opacity
				  of emissions shall be capable of measuring emission levels within ± 20%.
				  The Calibration Error Test and associated calculation procedures set forth in
				  Performance Specification 1 of 40 CFR 60, Appendix B shall be used for
				  demonstrating compliance with this specification.
A9.3.2.2. Continuous monitoring systems for measurement of
				  nitrogen oxides or sulfur dioxide shall be capable of measuring emission levels
				  within ± 20% with a confidence level of 95%. The Calibration Error Test,
				  the Field Test for Accuracy (Relative), and associated operating and
				  calculation procedures set forth in Performance Specification 2 of 40 CFR 60,
				  Appendix B shall be used for demonstrating compliance with this
				  specification.
A9.3.2.3. Owners or operators of all continuous monitoring
				  systems installed on an affected facility prior to October 6, 1975, are not
				  required to conduct tests under A9.3.2.1. and/or A9.3.2.2. above unless
				  requested by the Director.
A9.3.3. All continuous monitoring systems referenced by
				  A9.3.2. above shall be upgraded or replaced (if necessary) with new continuous
				  monitoring systems, and such improved systems shall be demonstrated to comply
				  with applicable performance specifications under A9.3.1. above by September 11,
				  1979.
A9.4. Owners or operators of all continuous monitoring
				  systems installed in accordance with the provisions of these rules 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 40 CFR 60, Appendix B 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 4% opacity. Unless otherwise approved by
				  the Director, the following procedures, as applicable, shall be
				  followed:
A9.4.1. 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
				  practical. Span and zero gases certified by their manufacturer to be traceable
				  to the National Bureau of Standards reference gases will be used whenever these
				  reference gases are available. The span and zero gas mixtures shall be the same
				  composition as specified in the 40 CFR 60, Appendix B. Every six months from
				  date of manufacture, span and zero gases shall be re-analyzed 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.
A9.4.2. For nonextractive 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.
A9.4.3. 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.
A9.5. Except for system breakdowns, repairs, calibration
				  checks, and zero and span adjustments required under A9.4. above, all
				  continuous monitoring systems shall be in continuous operation and shall meet
				  minimum frequency of operation requirements as follows:
A9.5.1. All continuous monitoring systems referenced by
				  A9.3.1. and A9.3.2. above 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.
A9.5.2. All continuous monitoring systems referenced by
				  A9.3.1. above 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.
A9.5.3. All continuous monitoring systems referenced by
				  A9.3.2. above, except opacity, shall complete a minimum of one cycle of
				  operation (sampling, analyzing, and data recording) for each successive
				  one-hour period.
A9.6. All continuous monitoring systems for 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 40 CFR 60, Appendix B shall be
				  used.
A9.7. 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 Director.
A9.8. 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, 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 subsection. 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 O2 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 these rules to specify the applicable
				  standard (e.g., rounded to the nearest 1% opacity).
A9.9. Upon written application by an owner or operator, the
				  Director may approve alternatives to any monitoring procedures or requirements
				  of these rules including, but not limited to the following:
A9.9.1. Alternative monitoring requirements when installation
				  of a continuous monitoring system or monitoring device specified by these rules
				  would not provide accurate measurements due to liquid water or other
				  interferences caused by substances with the effluent gases.
A9.9.2. Alternative monitoring requirements when the affected
				  facility is infrequently operated.
A9.9.3. Alternative monitoring requirements to accommodate
				  continuous monitoring systems that require additional measurements to correct
				  for stack moisture conditions.
A9.9.4. 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.
A9.9.5. Alternative methods of converting pollutant
				  concentration measurements to units of the standards.
A9.9.6. Alternative procedures for performing daily checks of
				  zero and span drift that do not involve use of span gases or test cells.
A9.9.7. Alternatives to the ASTM test methods or sampling
				  procedures specified by any subpart.
A9.9.8. Alternative continuous monitoring systems that do not
				  meet the design or performance requirements in Performance Specification 1 in
				  40 CFR 60, Appendix B 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
				  Director may require that such demonstration be performed for each affected
				  facility.
A9.9.9. 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.