
•	General Monitoring: New monitoring-related definitions (Section 367).
•	General Monitoring: Recordkeeping and reporting scheme for subject units that do not already have one (Section 367).
•	Testing: Program to ensure testing is representative of emission unit operation with associated notification (App A Section (II)).
•	Testing: Refine test stoppage requirements to more explicitly address current NWCAA concerns (App A Section (II)).
•	Monitoring: Allow compliance with federal programs to meet parts of Appendix A (App A Section (III)).
•	Monitoring: Require monitoring at all times except daily equipment checks (App A Section (III)).
•	Monitoring: Use conservative assumptions to estimate emissions when no other data are available (App A Section (III)).
•	Supplemental Monitoring: Require more frequent reporting of refinery excess emission events to allow NWCAA to follow up more promptly (App A Section (IV)).
•	Supplemental Monitoring: Require reporting when certain refinery monitors are down 10 percent of time over a semiannual period (App A Section (IV)).
•	Section 200: Clarify the definition of certain Chapter 401 program terms.
•	Section 458: Clean up rule by deleting section that applies to sources that are prohibited statewide.

AMENDATORY SECTION

SECTION 200 - DEFINITIONS

*****

AIR OPERATING PERMIT (AOP) - Any permit or group of permits covering a Chapter 401 source that is issued, renewed, amended, or revised pursuant chapter 173-401 WAC.

AIR OPERATING PERMIT (AOP) AFFECTED SOURCE - means sources specified in WAC 173-401-300.

*****

((AIR OPERATING PERMIT (AOP) AFFECTED SOURCE)) CHAPTER 401 SOURCE - This term shall have the meaning given to it in WAC 173-401-200. Additionally, for the purposes of NWCAA 322.4e), for Chapter 401 sources operating Sewage Sludge Incinerators (SSI), those emissions units not included in the Air Operating Permit are not part of the AOP affected source.

*****

PASSED: January 8, 1969 AMENDED: October 31, 1969, September 3, 1971, June 14, 1972, July 11, 1973, February 14, 1973, January 9, 1974, October 13, 1982, November 14, 1984, October 13, 1994, February 8, 1996, May 9, 1996, March 13, 1997, November 12, 1998, June 14, 2001, July 10, 2003, July 14, 2005, November 8, 2007, November 17, 2011, March 14, 2013, August 13, 2015, August 11, 2016, September 13, 2018, April 11, 2019, February 10, 2022, December 14, 2023, August 8, 2024, May 8, 2025, July 10, 2025, TBD

Reviser's note: The typographical error in the above material occurred in the copy filed by the Northwest Clean Air Agency and appears in the Register pursuant to the requirements of RCW 34.08.040.

AMENDATORY SECTION

SECTION 367 - GENERAL REQUIREMENTS FOR MONITORING AND TESTING

367.1 DEFINITIONS

CONTINUOUS EMISSION MONITORING SYSTEM (CEMS) - The total equipment required to sample, condition (if applicable), analyze, and provide a record of emissions. Continuous opacity monitoring systems (COMS) are not considered CEMS.

CONTINUOUS EMISSION RATE MONITORING SYSTEM (CERMS) - The total equipment (e.g., CEMS) required for determining and recording the pollutant mass emission rate (in terms of mass per unit of time) using stack flow rate.

CONTINUOUS MONITORING SYSTEM (CMS) - A comprehensive term that may include, but is not limited to, continuous emission monitoring systems (CEMS), continuous opacity monitoring systems (COMS), continuous emission rate monitoring systems (CERMS), continuous parameter monitoring system (CPMS) or other manual or automatic monitoring that is required for demonstrating compliance with an applicable emissions requirement, performance requirement, operating limit, or work practice standard on a continuous basis.

CONTINUOUS OPACITY MONITORING SYSTEM (COMS) - The total equipment required to sample, condition (if applicable), analyze, and provide a record of the opacity of emissions.

CONTINUOUS PARAMETER MONITORING SYSTEM (CPMS) - The total equipment required to sample, condition (if applicable), analyze, and provide a record of process or control system parameters (e.g., net heating value of flared gas).

((367.2 Before an approval to construct or a registration certificate is granted, the Control Officer may require the owner or applicant to provide and maintain such facilities as are necessary for sampling and testing purposes, including but not limited to safe access to sample locations, sample platforms, proper sample ports, and adequate shelter where appropriate.))

367.2 Any person operating a registered air contaminant source or ((an air operating permit)) a Chapter 401 source may, at any time, be required to monitor the ambient air, or process emissions, or conduct emission tests as deemed necessary by the Control Officer to protect air quality or assess compliance.

367.3 All ambient monitoring, compliance testing, and continuous ((emission)) monitoring systems((, and continuous opacity monitoring systems)) (CMS) required by ((a regulation, order of approval or permit issued by the)) regulatory programs implemented by NWCAA shall comply with the applicable requirements of this Section and NWCAA Appendix A ((of this Regulation)). The applicable requirements of this Section and NWCAA Appendix A are in addition to any monitoring, testing, calibration, or quality assurance/quality control (QA/QC) requirements that otherwise apply.

367.4 The Control Officer may take such samples and may perform any tests and investigations as are deemed necessary to determine the accuracy of the monitoring reports and data submitted to the NWCAA. The owner or operator may also be required by the Control Officer to collect a sample using an approved procedure and submit the results of the analysis thereof within a reasonable period of time.

367.5 ((Any NWCAA mandated)) When testing or monitoring ((which is not part of a federally-approved State Implementation Plan)) is required by regulatory programs implemented by NWCAA or ((other federally enforceable regulation)) under NWCAA 367.2, the owner or operator must ((be approved by the NWCAA. Such)) provide and maintain such facilities as are necessary for testing ((or)) and monitoring purposes, including but not limited to safe access to sample locations, sample platforms, proper sample ports, and adequate shelter where appropriate. ((may include the use of alternative methods, modified standard methods, and requirements or procedures not described in Appendix A of this Regulation.))

((367.6 The Control Officer may approve site-specific minor and intermediate changes to testing, monitoring, recordkeeping, and reporting requirements under the following conditions:

(A) In determining whether a change is minor or intermediate, NWCAA will use as a guide the definitions in 40 CFR 63.90 (July 1, 2004);

(B) Where the testing, monitoring, recordkeeping, or reporting requirement is included in a permit, the approval is made through the applicable permit revision procedures;

(C) NWCAA maintains a record of all approved changes to all testing, monitoring, recordkeeping, and reporting and provides a list of such changes to EPA Region 10 at least semi-annually.))

367.6 Unless another heating value is specified by an applicable requirement, when calculating emissions that require the fuel heating value, use the Higher Heating Value (HHV).

((367.7 The Control Officer may approve major changes to testing, monitoring, recordkeeping, and reporting requirements if such requirements are not part of the federally-approved State Implementation Plan or otherwise federally enforceable. Major changes to testing, monitoring, recordkeeping, and reporting requirements that are part of the federally-approved State Implementation Plan or otherwise federally enforceable require EPA approval.))

367.7 Recordkeeping and Reporting Under NWCAA Appendix A (III) and (IV)

(A) Monthly reports shall be submitted electronically or postmarked no later than 30 days after the end of the reporting month. Quarterly reports shall be submitted electronically or postmarked no later than 30 days after the end of the reporting quarter. Unless another time frame is specified by an applicable requirement, semiannual reports shall be submitted electronically no later than 30 days after the end of the reporting 6-month period.

(B) Records of all required monitoring data and support information shall be retained for a period of 3 years for registered sources and 5 years for Chapter 401 sources from the date of the monitoring sample, measurement, report, or application. Support information includes all calibration and maintenance records and copies of all required reports.

((367.8 Significant Figures and Rounding:

(A) All parameters used in stack test measurements and calculations shall meet or exceed the precision implied by an applicable standard, that is, contain at least as many significant figures as the standard. Additional numbers may be retained until the final rounding to calculate the emission rate or concentration. Unless specified by using scientific notation, all digits displayed in a standard, including zeros, are considered significant.

(B) Rounding shall use the following convention:

	First digit to be discarded	Last valid digit
	>5, or a 5 followed by a non zero	round up
	<5	retain as is
	5 , or 5 followed by only zero	round up if odd, retain if even))

PASSED: August 4, 1971 ((July 14, 2005)) AMENDED: February 14, 1973, July 14, 2005, July 10, 2025, TBD

Reviser's note: The typographical error in the above material occurred in the copy filed by the Northwest Clean Air Agency and appears in the Register pursuant to the requirements of RCW 34.08.040.

AMENDATORY SECTION

SECTION 458 - ((INCINERATORS - WOODWASTE BURNERS)) RESERVED

((458.1 All wood waste burners are required to meet the following conditions:

458.11 Visual emission of air contaminants from all wood waste burners shall meet the applicable provisions of Section 451.

458.12 All persons shall use Best Available Control Technology (BACT) in installing, maintaining, and operating wood waste burners. This requirement shall include a controlled tangential vent over-fire air system, an adequate under-fire air system, and the elimination of all unnecessary openings in the burner.

458.2 It shall be unlawful to cause or permit the emission of particulate matter (including smoke) from any wood waste burner, which moves beyond the property owned or controlled by the owner or operator of said burner, in sufficient quantity and of such characteristics and duration as is or is likely to be injurious or cause damage to human health, plant or animal life or property, or which unreasonably interferes with the enjoyment of property.))

((PASSED: June 14, 1972 AMENDED: August 8, 1978, July 10, 2025))

APPENDIX A AMBIENT MONITORING, COMPLIANCE TESTING, AND CONTINUOUS EMISSION AND OPACITY MONITORING

AMENDATORY SECTION

(II((.))) ((EMISSION)) COMPLIANCE TESTING

(A) GENERAL

(1) ((Unless specified in an applicable subpart,)) Unless another run length is specified by an applicable requirement or to meet detection limit standards, the ((test)) run length for ((an emission)) a compliance test shall((, whenever possible,)) equal or exceed the time period of the standard with which the test is to demonstrate compliance up to five hours of total sample collection time.

(2) ((Emission)) Compliance tests shall, whenever possible, employ methods with established detection limits (DL) lower than the applicable standard. ((Minor modifications to the test methods, designed to increase method precision, may be approved by the Control Officer, provided that such modifications do not represent a major modification to the test method, or a less stringent interpretation of applicable regulations.

(3) Where measured concentrations or emissions of pollutants are below the method detection limit the value of the detection limit shall be used to calculate average emissions, and the results shall be reported as "less than DL" if all runs were below the DL, and "less than" the average of the runs if one or more runs were above the DL. The detection limit shall be in units of the standard and actual DLs, whether standard or calculated, must be reported. Reagent blanks below the DL shall use a value of zero. In Method 23, DLs shall be treated as written in the method. DLs for similar pollutants cannot be added or averaged.))

(3) Except as provided in NWCAA Appendix A (II)(A)(4), compliance testing shall be performed as follows:

(a) The emissions unit shall operate at normal conditions at a normal maximum operating parameter during compliance testing. Identify in the test report a normal maximum operating parameter and value (e.g., firing rate, throughput, fuel composition) with an averaging period that matches the applicable standard for which compliance is being demonstrated, subject to review by NWCAA. Soot blowing is considered part of normal conditions. Normal conditions excludes periods of startup, shutdown, upset, or breakdown.

(b) When emissions unit operation exceeds 110% of the normal maximum operating parameter value and associated averaging period identified during the most recent compliance test, a notification listing these periods and operating parameter values shall be provided on a monthly basis.

(c) If an applicable requirement mandates compliance testing at representative conditions, representative conditions are considered normal conditions for the purposes of NWCAA Appendix A (II)(A)(3).

(((4) Gas dilution systems used for instrument calibration shall comply with EPA Method 205.))

(4) The following compliance testing is exempt from NWCAA Appendix A (II)(A)(3):

(a) Compliance testing at natural gas compressors where compression throughput is driven solely by pipeline demand.

(b) Compliance testing for ammonia on emissions units that use ammonia compounds as a control agent for nitrogen oxides (i.e., ammonia slip).

(d) Compliance testing for vapor control systems at truck loading racks and marine loading to demonstrate VOC control efficiency (i.e., percent by weight control or milligrams per liter of product loaded).

(e) If an applicable requirement explicitly lists compliance testing must be done at a specified minimum operating rate, emissions units must test at that rate rather than as required in NWCAA Appendix A (II)(A)(3).

(5) Stopping a compliance test solely due to showing noncompliance with the standard is prohibited.

(6) Calculations

(a) All parameters used in compliance test measurements and calculations shall meet or exceed the precision implied by an applicable standard, that is, contain at least as many significant figures as the standard. Additional numbers may be retained until the final rounding to calculate the emission rate or concentration.

(b) Where measured concentrations or emissions of pollutants are below the method detection limit (DL), the value of the detection limit shall be used to calculate average emissions, and the results shall be reported as "less than DL" if all runs were below the DL, and "less than" the average of the runs if one or more runs were above the DL. The detection limit shall be in units of the standard and actual DLs, whether standard or calculated, must be reported. Reagent blanks below the DL shall use a value of zero.

(B) TEST PLANS AND TEST DATES

(1) ((A source)) Unless another time frame is specified by an applicable requirement or otherwise approved by NWCAA, the compliance test plan shall be submitted ((for approval by the NWCAA for all compliance source tests)) to NWCAA electronically or postmarked at least ((thirty (30))) 30 days prior to the scheduled test date((, unless otherwise specified in an applicable subpart. A summary of the test shall accompany the test plan and be submitted on a template provided by the NWCAA)). The compliance test plan shall comprise a summary of the proposed test, including the emissions unit to be tested, the proposed test date, which test methods will be used, the pollutants and emission standards to be tested for, any operational parameters to be recorded during testing, the proposed normal maximum operating parameter, if applicable, and any modification to the listed method. CGA and RATAs are not considered ((source)) compliance tests. NWCAA may require changes to the test plan.

(2) ((Once a test plan has been approved by the NWCAA, any)) Any changes in test dates require NWCAA notification via phone or email. Any changes in testing ((or)) methodology ((shall)) require NWCAA approval in advance of the compliance testing((, provided such changes do not conflict with other requirements or extend the test date beyond the date specified in a subpart)).

(((1) Unless otherwise specified in an applicable subpart or a permit condition, the facility shall operate at normal conditions. Normal operation shall exclude periods of startup, shutdown, or unit malfunction. Soot blowing is considered part of normal operations.

(2) If maximum capacity does not represent the condition which results in the highest emissions, the facility may be required to repeat the test at different load conditions and/or during use of a different fuel.

(3) All operating parameters, listed and approved under II(B) shall be recorded during the test.))

(1) A test report shall be directly submitted to NWCAA in electronic format no later than 60 days after the completion of the field work portion of the compliance test, unless another timeframe is specified by an applicable requirement.

(2) All field data, operational data listed in the test plan and any NWCAA response, quality assurance information, sample calculations, and other supporting information, such as certificates for gas standards, or meter box and calibrations, shall be recorded during the compliance test and included in the test report.

(3) Data generated during incomplete compliance tests shall be submitted no later than 60 days after the completion of the field work portion of the test. Documentation of the reasons for any test stoppage shall be included in the test report.

(((D) TEST STOPPAGES

(1) Once initiated, a compliance test shall be completed, except as noted in II (D)(2). Failure to complete a test shall be a violation of the requirement to test, and, in cases where the initial data indicate non-compliance with the applicable emission standard, the results may be considered a violation of that standard.

(2) A stack test may be stopped due to severe weather, tester equipment failure, unit failure, safety considerations, or other conditions beyond the control of the facility. The NWCAA observer may void a test or individual run on-site if procedures are determined to be employed incorrectly.

(3) Data generated during aborted tests shall be appended to the report of the valid repeat test. Documentation of the reasons for test stoppage shall be included in the test report. Test stoppages under II (D)(2) do not provide an extension of any test deadline.

(E) POSTPONEMENT

(1) Compliance tests shall be completed prior to the required test deadline as listed in the applicable subpart or a permit condition. Failure to conduct a timely compliance test constitutes a violation of the requirement to test.

(F) TEST REPORT

(1) A test report shall be submitted to the NWCAA no later than 60 (sixty) days after the completion of the test, unless otherwise specified by an applicable subpart.

(2) A summary of the test shall accompany the test report and submitted on a template provided by the NWCAA.

(3) All field data, operational data listed in the test plan, quality assurance information, sample calculations, and other supporting information, such as certificates for gas standards, or meter box and calibrations, shall be included in the test report.

(G) REQUIREMENTS FOR RE-TESTING

(1) A facility shall be required to repeat a test, and may be required to conduct source tests more frequently, if one or more of the following conditions are encountered:

(a) The facility exceeded the applicable standard.

(b) If the test was stopped for any reason.

(c) If operating conditions or testing methodology deviated significantly from those described in the original test plan.

(d) If the test was voided by the NWCAA.))

PASSED: July 14, 2005 AMENDED: July 10. 2025, TBD

Reviser's note: The typographical errors in the above material occurred in the copy filed by the Northwest Clean Air Agency and appear in the Register pursuant to the requirements of RCW 34.08.040.

AMENDATORY SECTION

(III((.))) CONTINUOUS EMISSION AND OPACITY MONITORING

(A) GENERAL

(((1) Unless subject)) Except those that are required to ((acid rain regulations ())comply with the monitoring requirements under federal programs (i.e., 40 CFR ((Part 75)) 60.13 with both Appendix B and F or 40 CFR 63.8), all continuous emission monitoring (((CEM))) systems (CEMS), continuous opacity monitoring systems (COMS), and continuous emission rate monitoring systems (CERMS) required by regulatory programs implemented by NWCAA shall ((be)):

(1) Be capable of meeting the appropriate EPA performance specification using procedures outlined in 40 CFR 60((,)) Appendix B. ((CEMs subject to acid rain regulations shall be capable of meeting the specifications outlined in the appropriate Section of 40 CFR Part 75.))

(2) ((All CEMs shall be)) Be operated in accordance with the appropriate ((Section)) procedure of 40 CFR 60((,)) Appendix F((.)) including calibration, maintenance, auditing, quality assurance/quality control (QA/QC) documentation, and recordkeeping requirements as modified in NWCAA Appendix A(III).

(((3) A Quality Assurance (QA) and a station log book shall be kept for all stations. The station log book shall be used to record all ongoing activities associated with station operation.))

(3) Meet the following minimum frequency of operation requirements:

(a) For all CEMS and CERMS, "continuous" shall be defined as a minimum of one measurement (i.e., sampling, analyzing, and data recording) for each successive 15-minute period. One-hour averages based on clock hours, including partial monitoring system operating hours, as appropriate, shall be calculated in accordance with 40 CFR 60.13 (h)(2)(i) through (v).

(b) For COMS, "continuous" shall be defined as a minimum of one measurement every 10 seconds. Data shall be reduced to 6-minute averages. Six-minute opacity averages shall be calculated from 36 or more data points equally spaced over each 6-minute period.

(((4) The operator shall assess the operation of each CEM daily. The date, time, operator and location shall be written on the strip chart and log book each time the monitor is checked manually. Recorder charts shall be documented with explanations for unusual traces, maintenance, invalid data, calibrations, etc. On a case-by-case basis the NWCAA may approve the use of electronic log books.

(5) For gaseous CEMs, "continuous" shall be defined as a minimum of one measurement every 15 minutes, i.e., four equally spaced data points comprising an hourly average.

(6) For continuous opacity monitors (COMs), "continuous" shall be defined as a minimum of one measurement every 15 seconds.

(7) Continuous emission rate monitors shall comply with 40 CFR Part 60, Appendix B, Specification 6. The flow portion of the system shall be checked periodically against EPA Method 2.

(B) CALIBRATION

(1) CEM calibration drift (precision) checks shall be conducted daily in accordance with 40 CFR Part 60, Appendix F and the written operational procedures.

(2) The instrument shall be adjusted in accordance with the requirements of the applicable performance specification of 40 CFR Part 60, Appendix B.

(3) Temperature monitors shall be accurate to within 5 degrees F, unless otherwise specified in a subpart.

(4) A section on calibration check and adjustment procedures shall be included in the CEM QA document.

(5) Continuous opacity monitors shall be calibrated as outlined in 40 CFR Part 60, Appendix B, Specification 1 and the manufacturer's procedures.))

(B) MAINTENANCE AND AUDITING

(1) Each CEMS, COMS, and CERMS required by regulatory programs implemented by NWCAA shall have a log book or file (electronic or hardcopy) to record all ongoing activities associated with the operation of each monitoring system. Any work performed on any portion of the monitoring system shall be recorded, including the following information:

(a) Date, time, and personnel identification

(b) Reason for station visit

(d) Time period for which the analyzer was offline

(2) Each CEMS, COMS, and CERMS required by regulatory programs implemented by NWCAA shall develop and maintain a QA/QC program that includes a written record of procedures needed to maintain the monitoring system in proper operating condition and a schedule for those procedures. The program shall also include procedures specified by the manufacturers of the equipment and, if applicable, additional or alternate procedures developed for the equipment.

(((C) MAINTENANCE

(1) Continuous opacity monitors shall be maintained according to "Recommended Quality Assurance Procedures for Opacity Continuous Emission Monitoring Systems" (EPA 340/1-86-10) and the manufacturer's procedures.

(2) All gaseous CEMs shall be maintained using QA criteria of 40 CFR Part 60, Appendix F and the manufacturer's procedures.

(3) Temperature monitors shall be maintained according to manufacturer's recommendations.

(4) A section on preventive maintenance procedures shall be included in the CEM QA document.))

(1) All measurements related to operation of CEMS, COMS, and CERMS required by regulatory programs implemented by NWCAA shall be accessible onsite, including continuous monitoring system, monitoring device, and performance testing measurements; all continuous monitoring system performance evaluations; all continuous monitoring system or monitoring device calibration checks; adjustments and maintenance performed on these systems or devices; and all other required information maintained and recorded in a permanent form suitable for inspection. In addition, records shall be maintained of occurrence and duration of any startup, shutdown, or malfunction in the operation of the associated emissions unit; any malfunction of the air pollution control equipment; and any periods during which a continuous monitoring system or monitoring device is inoperative.

(2) For the purposes of NWCAA 367.7(B), all CEMS and CERMS required by regulatory programs implemented by NWCAA shall digitally capture and store data in the shortest measurement increment frequency if greater than 1 minute or 1-minute averages otherwise. COMS required by regulatory programs implemented by NWCAA shall store 10-second readings.

(3) Except for calibration drift checks, all CEMS, COMS, and CERMS required by regulatory programs implemented by NWCAA shall be in continuous operation during emissions unit operation.

(4) CEMS, COMS, or CERMS data shall be considered invalid unless demonstrated otherwise, and flagged, if any of the following are true:

(a) For those monitoring systems that are complying with 40 CFR Part 60 Appendix B, the monitoring system is not operated and maintained in accordance with the applicable performance specifications of 40 CFR Part 60 Appendix B.

(b) For those monitoring systems that are complying with 40 CFR Part 60 Appendix F, quality assurance procedures are not in accordance with 40 CFR Part 60 Appendix F.

(c) For those monitoring systems that are complying with 40 CFR 63.8, the monitoring system is not operated and maintained in accordance with the applicable requirements of 40 CFR 63.8(c).

(d) The CEMS, COMS, or CERMS is not operative or is off-line.

(e) The monitor is conducting a calibration drift check or CGA.

(f) The monitor is "out-of-control" as defined by an applicable requirement (e.g., 40 CFR Part 60 Appendix F, 40 CFR 63.8 (c)(7)).

(5) Data generated during CGAs or calibration drift checks shall be excluded for purposes of determination of compliance with an emission standard or monitor uptime requirements.

(6) Data substitution for missing CEMS, COMS, or CERMS data:

(a) During periods of normal operation when CEMS, COMS, or CERMS data are missing or invalid, parametric data, an engineering assessment, or emissions unit test data shall be used to determine emissions and flagged as such. An emission determination is not required if the invalid monitor data are exclusively the result of a calibration drift check or CGA.

(b) During startup, shutdown, upset, or breakdown periods when CEMS, COMS, or CERMS data are missing, invalid, pegged, or not representative of emissions unit operation, parametric data or an engineering assessment may be used to determine emissions and flagged as such. If a reasonable emission estimation method, as determined by NWCAA is not available, emissions shall be reported using conservative (i.e., resulting in maximum emissions) assumptions.

(7) CEMS, COMS, or CERMS downtime (in percent) shall be calculated as the [(monitor invalid time as defined in NWCAA Appendix A (III)(C)(4)) divided by (total emissions unit operating time in the month)] times 100. For opacity, all times are in minutes. For gases, all times are in hours. Monitor uptime (in percent) shall be calculated as 100 minus monitor downtime.

(8) CEMS, COMS, and CERMS required by regulatory programs implemented by NWCAA are required to maintain greater than 90% monitor uptime on a monthly basis.

(((D) AUDITING - Continuous Opacity Monitors (COMs)

(1) Accuracy checks shall be performed according to EPA "Recommended Quality Assurance Procedures for Opacity Continuous Emission Monitoring Systems" (EPA 340/1-86-10). Testing in addition to otherwise applicable requirements shall be implemented as follows:

(a) On-stack performance audit: A calibration error check shall be conducted if accuracy or linearity of data does not comply with applicable specifications.

(b) An off-stack (clear path) zero alignment shall be conducted if the percentage difference between the simulated zero check response and the true value is greater than suggested manufacturer's limits or standards.

(2) System audits may be conducted by the NWCAA. The audit may include an on-site inspection of the opacity monitor and a review of operating procedures, site log, documentation of data collection activity, and location criteria.

(3) Multi-performance audits may be conducted by the NWCAA to assess data accuracy and to determine if the opacity monitor meets the applicable performance specification.))

(D) NOTIFICATIONS AND REPORTING

(1) Upon completion of a RATA, submit the test report electronically to NWCAA no later than 60 days after the completion of the field work portion of the test. Include all RATA run data, including those runs not used to calculate the relative accuracy, and any failed RATAs, and subsequent corrective actions taken, in the test report.

(2) The following data shall be submitted to the NWCAA on a monthly basis:

(a) Time, date, magnitude, and cause of all emissions which exceed the applicable standard(s).

(b) The cause and time periods of CEMS, COMS, or CERMS invalid data not associated with routine calibration drift checks or CGAs.

(c) Periods of operation of primary, any spare CEMS, COMS, or CERMS; and CEMS, COMS, or CERMS changeouts over the month, including note of the use of any rental monitoring equipment.

(d) Monitor uptime for each CEMS, COMS, or CERMS, listed by unit, parameter, and pollutant.

(e) Other data or information as required by the Control Officer.

(3) CEMS, COMS, and CERMS required by regulatory programs implemented by NWCAA shall submit the Data Assessment Report (DAR) under 40 CFR 60 Appendix F on a quarterly basis.

(((E) AUDITING - GASEOUS MONITORS

(1) Data accuracy assessments shall be performed at least once every calendar quarter and at periodic intervals determined by monitor performance and data accuracy.

Data accuracy assessments shall be conducted in accordance with procedures outlined in 40 CFR Part 60, Appendix F. The following testing methods shall be used as described in Part 60:

(a) Relative Accuracy Test Audit (RATA)

(b) Relative Accuracy Audit (RAA)

The Relative Accuracy Test Audit shall be conducted at least once every four (4) calendar quarters as described in the applicable performance specification outlined in 40 CFR Part 60, Appendix B.

(2) All RATAs shall assess accuracy in units of the applicable standard with which compliance is being determined and shall test the entire system. Accuracy calculations shall be based on the output of the CEM's data acquisition system.

(3) Data accuracy assessments which require the CEM to be off-line shall not be performed during periods in which the CEM is measuring greater than 75% of the applicable standard without prior approval by the NWCAA.

(4) System audits may be conducted by the NWCAA. The audit may include an on-site inspection of the CEM and a review of operating procedures, site log, documentation of data collection activity, and location criteria.

(5) Multi-performance audits may be conducted by the NWCAA to assess data accuracy and to determine if the CEM meets the applicable performance specification.

(F) DATA RECORDING, VALIDATION AND REPORTING

(1) Strip charts shall be used for all monitors unless the data acquisition system is capable of generating trend graphs from one-minute averages. Paperless strip charts are acceptable if configured to store one-minute averages (15-second or better averages for opacity monitors). Strip chart times shall not deviate from the time of the data acquisition system by more than 10 minutes.

(2) All gaseous CEMs shall be able to digitally capture and store data in at least 5-minute averages, unless the data acquisition system is used to replace strip charts in which case one-minute storage shall be required. Opacity monitoring systems shall be capable of storing 15-second averages.

(3) All data shall be retained for a period of at least five (5) years and be available to the NWCAA upon request.

(4) Each CEM shall have a log book or file on site. Any work performed on any portion of CEM system shall be recorded, including the following information:

(a) Date, time, and personnel identification

(b) Reason for station visit

(d) Time period for which the analyzer was offline

(5) Each CEM shall have a QA manual on site which address all quality control requirements outlined in 40 CFR Part 60, Appendix F, Section 3. All QA procedures should be described in sufficient detail to assure that all operators carry out procedures in the same manner. At a minimum, the following shall be included:

(a) Instrument installation description including model and serial numbers

(b) Operating procedures including daily check procedures and pertinent instrument settings

(d) Quality control limits and instrument adjustments procedures

(e) Preventive maintenance procedures

(f) Data recording, validation, backup, and reporting procedures

(g) Accuracy assessment procedures for CGAs and RATAs

(h) Corrective action plan for malfunctioning CEM, including reporting requirements

(i) List of current station operators

(j) Vendor names and addresses

(k) Spare parts inventory

(l) Evidence of operator training

(6) Data from strip chart recorders or recording devices approved under III (F)(1), shall be reviewed and, if applicable, compared to corresponding data logger values, and then signed by the station operator. At a minimum, the following information shall be checked and appropriately labeled:

(a) Zero and span/precision checks

(b) Preventive maintenance operations

(d) Unusual chart traces

(e) Time, date, and personnel identification

(7) Pre-adjustment values for automatically adjusting monitors shall be documented (40 CFR Part 60, Appendix F, Section 4.2).

(8) All unusual or questionable data shall be investigated and, if appropriate, be voided. For gaseous monitors, a minimum of 45 minutes of valid data in a 1-hour period is required for the hour to be considered valid. A minimum of 18 hours of valid data in a 24 hour period is required for the day to be considered valid.

(9) CEM data shall be considered invalid, and flagged for reporting purposes, if:

(a) The monitor is not operated and maintained in accordance with the applicable performance specifications of 40 CFR Part 60, Appendix B.

(b) Quality assurance procedures are not in accordance with 40 CFR Part 60, Appendix F.

(d) The monitor is being zeroed or spanned.

(e) The CEM is "out-of-control" as defined in 40 CFR Part 60, Appendix F.

(10) Data generated during QA audits (e.g., CGAs), calibration, and calibration drift checks shall be excluded for purposes of compliance determination.

(11) For reporting purposes, averaging periods for CEMs are one (1) clock hour for gaseous monitors, six (6) minutes for opacity monitors, and fifteen (15) minutes for temperature monitors, unless otherwise specified by applicable limits.

(12) Missing data substitution: Missing or invalid data shall be substituted using the following procedures:

(a) Missing data from CEMs that are turned off during periods of excess emissions shall be reported as exceedances of all applicable emission standards.

(b) Parametric, engineering, or source test data may be utilized for data substitution during periods of normal operation as demonstrated by operating data.

(c) Data substitution is not required if invalid data are the result of CEMs drift checks, calibrations, audits, or preventative maintenance.

(d) If neither (a) nor (b) above apply, the following substitution scheme is to be used:

Previous 30 day data availability	Up to 24 hours of missing data:	Greater than 24 hours of missing data
≥95%	Average of last and first valid hour bracketing the missing data period.	The average of first and last valid hour or the 90th percentile value during the last 720 hours, whichever is greater
Previous 30 day data availability	Up to 8 hours of missing data:	Greater than 8 hours of missing data
≥90% and < 95%	Average of last and first valid hour bracketing the missing data period	The average of first and last valid hour or the 95th percentile value during the last 720 hours, whichever is greater
< 90%	Maximum hourly average over the last 30 days	Maximum hourly average over the last 30 days

(13) Data availability (in percent) shall be defined as the [(number of valid (excluding substituted) hours of CEM data in a reporting month) minus (hours of calibration/CD/QA checks)] divided by [total hours of operation of the corresponding unit in that month] times 100.

(14) CEMs are required to maintain greater than 90% data availability on a monthly basis. A supplemental report shall be submitted if during any calendar month a CEM system fails to produce 90% data availability, stating the reason(s) for the low data availability.

(15) The following data shall be submitted to the NWCAA on a monthly basis or according to the applicable standard:

(a) Time, date, magnitude, and cause of all emissions or temperatures which exceed the applicable standard(s).

(b) The cause and time periods of any bypass of the air pollution control equipment.

(d) Data availability for each CEM, listed by unit and parameter.

(e) Supplemental report for system with ≤90% monthly data availability.

(f) Other data or information as required by the Control Officer.

(16) Monthly reports shall be postmarked no later than thirty (30) days after the end of the reporting month.

(17) A Data Assessment Report as defined in 40 CFR Part 60 Appendix F, Section 7 shall be submitted to the NWCAA on a quarterly basis and other time interval as specified by the NWCAA.))

PASSED: July 14, 2005 AMENDED: July 10. 2025, TBD

Reviser's note: The typographical error in the above material occurred in the copy filed by the Northwest Clean Air Agency and appears in the Register pursuant to the requirements of RCW 34.08.040.

NEW SECTION

(IV) SUPPLEMENTAL MONITORING REPORTING

(A) For affected sources subject to the periodic report under 40 CFR 63 Subpart CC 63.655(g), submit the applicable information under 63.655 (g)(6), (10)(iv), (11) (except (11)(iv)(F)), (12), and (13) to NWCAA on a monthly basis. Include for each referenced event the date and time for each occurrence, the parameter that is monitored, the measured parameter values, and an estimate of excess emissions as appropriate.

(B) For the continuous parameter monitoring system (CPMS) subject to the out-of-control periods determination under 40 CFR 63 Subpart CC 63.671(c) and for those CPMS that are subject to reporting under 40 CFR 63 Subpart UUU 63.1575(d), submit a semiannual report for each CPMS when its downtime exceeds 10% on a semiannual basis that includes the following information:

(1) The total operating time of each affected source during the reporting period.

(2) Information on the number, duration, and cause for monitor downtime (including unknown cause, if applicable, other than downtime associated with zero and span and other daily calibration checks).

PASSED: TBD