18396 Federal Register / Vol. 88, No. 60 / Wednesday, March 29, 2023 / Rules and Regulations 
13, 2023. The safety zone will be 
enforced for all navigable waters of the Lower Mississippi River, New Orleans, LA from MM 94 to MM 95. In the event of inclement weather, the safety zone will be enforced from 7:30 to 8:45 p.m. on April 14, 2023. During the enforcement period, as reflected in § 165.845 paragraphs (a) through (d), entry into this zone is prohibited to all vessels and persons except vessels authorized by the COTP or designated representative. A designated representative means any Coast Guard commissioned, warrant, or petty officer of the U.S. Coast Guard assigned to units under the operational control of Sector New Orleans. Persons and vessels requiring entry into this safety zone must request permission from the COTP or a designated representative. They may be contacted on VHF–FM Channel 16 or 67 or by telephone at (504) 365–2545. Persons and vessels permitted to enter this safety zone must transit at their slowest safe speed and comply with all lawful directions issued by the COTP or the designated representative. 
In addition to this notification of 
enforcement in the Federal Register, the Coast Guard plans to provide notification of this enforcement period via Marine Safety Information Bulletin and Broadcast Notice to Mariners. 
Dated: March 22, 2023. 
K.K. Denning, 
Captain, U.S. Coast Guard, Captain of the 
Port Sector New Orleans. 
[FR Doc. 2023–06460 Filed 3–28–23; 8:45 am] 
BILLING CODE 9110–04–P 
ENVIRONMENTAL PROTECTION 
AGENCY 
40 CFR Parts 51, 60, and 63 
[EPA–HQ–OAR–2020–0556; FRL–8335–02– 
OAR] 
RIN 2060–AV35 
Testing Provisions for Air Emission 
Sources 
AGENCY : Environmental Protection 
Agency (EPA). 
ACTION : Final rule. 
SUMMARY : This action promulgates 
corrections and updates to regulations for source testing of emissions under various rules. This final rule includes corrections to typographical and technical errors, updates to outdated procedures, and revisions to add clarity and consistency with other monitoring requirements. The revisions will improve the quality of data but will not impose new substantive requirements on source owners or operators. 
DATES : This rule is effective on May 30, 
2023. The incorporation by reference of certain material listed in the rule is approved by the Director of the Federal Register on May 30, 2023. The incorporation by reference of certain other material listed in the rule was approved by the Director of the Federal Register as of March 18, 2008, April 16, 2012, and May 15, 2015. 
ADDRESSES : The EPA has established a 
docket for this action under Docket ID No. EPA–HQ–OAR–2020–0556. All documents in the docket are listed on the www.regulations.gov website. 
Although listed in the index, some information is not publicly available, e.g., confidential business information 
or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the internet and will be publicly available only in hard copy. Publicly available docket materials are available electronically through www.regulations.gov. 
FOR FURTHER INFORMATION CONTACT : Mrs. 
Lula H. Melton, Office of Air Quality Planning and Standards, Air Quality Assessment Division (E143–02), Environmental Protection Agency, Research Triangle Park, NC 27711; telephone number: (919) 541–2910; fax number: (919) 541–0516; email address: melton.lula@epa.gov. 
SUPPLEMENTARY INFORMATION : The 
supplementary information in this preamble is organized as follows: 
I. General Information 
A. Does this action apply to me? 
B. What action is the agency taking? C. Judicial Review 
II. Background III. Incorporation by Reference IV. Summary of Amendments 
A. Method 201A of Appendix M of Part 51 B. General Provisions (Subpart A) of Part 
60 
C. Standards of Performance for New 
Residential Wood Heaters (Subpart AAA) of Part 60 
D. Standards of Performance for New 
Residential Wood Heaters, New Residential Hydronic Heaters, and Forced-Air Furnaces (Subpart QQQQ) of Part 60 
E. Method 1 of Appendix A–1 of Part 60 F. Method 4 of Appendix A–3 of Part 60 G. Method 7 of Appendix A–4 of Part 60 H. Method 19 of Appendix A–7 of Part 60 I. Method 25 of Appendix A–7 of Part 60 J. Method 25C of Appendix A–7 of Part 60 K. Method 26 of Appendix A–8 of Part 60 L. Performance Specification 1 of 
Appendix B of Part 60 
M. Performance Specification 2 of 
Appendix B of Part 60 
N. Performance Specification 4B of 
Appendix B of Part 60 O. Performance Specification 6 of 
Appendix B of Part 60 
P. Performance Specification 12A of 
Appendix B of Part 60 
Q. Performance Specification 16 of 
Appendix B of Part 60 
R. Procedure 1 of Appendix F of Part 60 S. Procedure 5 of Appendix F of Part 60 
T. General Provisions (Subpart A) of Part 
63 
U. National Emission Standards for 
Hazardous Air Pollutants From the Pulp and Paper Industry (Subpart S) of Part 63 
V. National Emission Standards for 
Hazardous Air Pollutants From Hazardous Waste Combustors (Subpart EEE) of Part 63 
W. National Emission Standards for 
Hazardous Air Pollutants: Paper and Other Web Coating (Subpart JJJJ) of Part 63 
X. National Emission Standards for 
Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines (Subpart ZZZZ) of Part 63 
Y. National Emission Standards for 
Hazardous Air Pollutants: Engine Test Cells/Stands Residual Risk and Technology Review (Subpart PPPPP) of Part 63 
Z. National Emission Standards for 
Hazardous Air Pollutants: Coal- and Oil- Fired Electric Utility Steam Generating Units (Subpart UUUUU) of Part 63 
AA. Method 315 of Appendix A of Part 63 BB. Method 323 of Appendix A of Part 63 
V. Public Comments on the Proposed Rule VI. Statutory and Executive Order Reviews 
A. Executive Order 12866: Regulatory 
Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review 
B. Paperwork Reduction Act (PRA) C. Regulatory Flexibility Act (RFA) D. Unfunded Mandates Reform Act 
(UMRA) 
E. Executive Order 13132: Federalism F. Executive Order 13175: Consultation 
and Coordination With Indian Tribal Governments 
G. Executive Order 13045: Protection of 
Children From Environmental Health Risks and Safety Risks 
H. Executive Order 13211: Actions 
Concerning Regulations That Significantly Affect Energy Supply, Distribution or Use 
I. National Technology Transfer and 
Advancement Act and 1 CFR Part 51 
J. Executive Order 12898: Federal Actions 
To Address Environmental Justice in Minority Populations and Low-Income Populations 
K. Congressional Review Act (CRA) 
I. General Information 
A. Does this action apply to me? 
The amendments promulgated in this 
final rule apply to industries that are 
subject to the current provisions of 40 CFR parts 51, 60, and 63. We did not list all the specific affected industries or their North American Industry Classification System (NAICS) codes herein since there are many affected 
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sources in numerous NAICS categories. 
If you have any questions regarding the applicability of this action to a particular entity, consult either the air permitting authority for the entity or your EPA Regional representative as listed in 40 CFR 63.13. 
B. What action is the agency taking? 
We are promulgating corrections and 
revisions to source test methods, 
performance specifications (PS), and associated regulations. The revisions correct typographical and technical errors, provide updates to testing procedures, and add clarity and consistency among monitoring requirements. 
C. Judicial Review 
Under section 307(b)(1) of the Clean 
Air Act (CAA), judicial review of this 
final rule is available by filing a petition for review in the United States Court of Appeals for the District of Columbia Circuit by May 30, 2023. Under section 307(d)(7)(B) of the CAA, only an objection to this final rule that was raised with reasonable specificity during the period for public comment can be raised during judicial review. Moreover, under section 307(b)(2) of the CAA, the requirements that are the subject of this final rule may not be challenged later in civil or criminal proceedings brought by the EPA to enforce these requirements. 
II. Background 
The EPA catalogs errors and 
corrections, as well as necessary 
revisions to test methods, performance specifications, and associated regulations in 40 CFR parts 51, 60, and 63 and periodically updates and revises these provisions. The most recent updates and revisions were proposed on April 26, 2022 (87 FR 24488). The public comment period for the present proposed revisions ended June 27, 2022, and 11 comment letters were received from the public. This final rule was developed based on public comments that the agency received on the proposed rule. 
III. Incorporation by Reference 
The EPA is incorporating by reference 
two ASTM International (ASTM) 
standards. Specifically, the EPA has incorporated ASTM D6216–20, which covers the procedure for certifying continuous opacity monitors and includes design and performance specifications, test procedures, and quality assurance (QA) requirements to ensure that continuous opacity monitors meet minimum design and calibration requirements necessary for accurate opacity monitoring measurements in regulatory environmental opacity monitoring applications subject to 10 percent or higher opacity standards. The EPA also updated the incorporation by reference for ASTM D6784, a test method for elemental, oxidized, particle-bound, and total mercury in emissions from stationary sources, from the 2002 version to the 2016 version. This update applies to incorporations by reference in 40 CFR part 60, appendix B, Performance Specification 12A for continuous monitoring of mercury emissions. The EPA updated the incorporations by reference in 40 CFR part 63 for use of ASTM D6784 under table 5 and appendix A of Subpart UUUUU, for mercury emissions measurement and monitoring. Both the ASTM D6216–20 and ASTM D6784–16 standards were developed and adopted by the ASTM International. The ASTM standards may be obtained from www.astm.org or from the ASTM at 100 
Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428–2959. 
The EPA also is incorporating by 
reference the Standard Methods Committee Method 5210 Biochemical Oxygen Demand (BOD) from ‘‘Standard Methods for the Examination of Waste and Wastewater.’’ This standard is acceptable as an alternative to method 405.1 and is available from the Standards Method Committee at www.standardmethods.org or by 
telephone at (844) 232–3707. 
The EPA also made specific 
modifications to requirements in an existing incorporation by reference, the ASTM E2515–11 test method. The stipulations modify the post-test leak check procedures as well as add procedures for performing leak checks during a sampling run. 
The following standards are already 
currently incorporated in the location where they appear in the rule: ANSI/ ASME PTC 19.10–1981, ASTM–D6348– 03. ASTM–D6348–03(R2010), ASTM– D6522–00 (2005). 
IV. Summary of Amendments A. Method 201A of Appendix M of Part 
51 
In method 201A, the erroneous 
equation 25 in section 12.5 is corrected. 
B. General Provisions (Subpart A) of 
Part 60 
In the General Provisions of part 60, 
§ 60.17(h) is revised to add ASTM D6216–20 and D6784–16 to the list of incorporations by reference and to re- number the remaining consensus standards that are incorporated by reference in alpha-numeric order. C. Standards of Performance for New Residential Wood Heaters (Subpart AAA) of Part 60 
Subpart AAA is amended to add 
stipulations for use of the ASTM E2515– 11 test method. The stipulations modify the post-test leak check procedures as well as add procedures for performing leak checks during a sampling run. The stipulations to ASTM E2515–11 are necessary as we have learned that the quality assurance/quality control (QA/ QC) requirements for leak tests required by ASTM E2515–11, section 9.6.5.1 are not sufficient to provide assurance of the sampling system integrity. Additionally, the language of ASTM E2515–11, section 9.6.5.1 currently allows for averaging the particulate matter (PM) results from a non-leaking sampling system with those from a leaking sampling system, which effectively reduces reported PM emissions by as much as half, rendering the test method inappropriate for compliance determination. 
We revised the language in § 60.534(c) 
and developed new language to replace ASTM E2515–11, section 9.6.5.1 by adding § 60.534(c)(1), which specifies appropriate post-test leak check procedures and in § 60.534(c)(2) by adding procedures for performing leak checks during a sampling run. These modifications bring appropriate QA/QC requirements to PM measurements required by the rule and eliminate opportunity for emissions test results to be considered valid when a leaking sampling system allows dilution of the PM sample(s). This language was amended slightly based on comments received to further clarify that sample volume collected during the process of conducting leak checks during a test run is not to be included in the overall sampling volume as it would dilute the collected sample volume were it treated in that manner. 
In § 60.534(d), the first hour PM 
emissions measurements are to be conducted using a separate ASTM E2515–11 sampling train operated concurrently with the paired ASTM E2515–11 sampling trains used in compliance PM sampling. In this manner, the first hour PM emissions will be collected appropriately, and the compliance test measurements will not be impacted by a sampling pause for filter replacement at the 1-hour mark. 
The regulatory language in 
§ 60.539b(b) is revised to include General Provisions that were added to § 60.8(f)(2) (81 FR 59801, August 30, 2016) and were inadvertently exempted from inclusion in subpart AAA as that rule, as promulgated in 2015, exempted 
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§ 60.8(f) in its entirety. The exemption 
promulgated in subpart AAA at § 60.539b(b) was intended to exempt those affected sources from § 60.8(f), which, at the time, consisted of what is now currently § 60.8(f)(1) and is specific to compliance testing results consisting of the arithmetic mean of three replicate tests. These modifications will ensure that emissions test reporting includes all data necessary to assess and assure the quality of the reported emissions data and appropriately describes and identifies the specific unit covered by the emissions test report. Since compliance tests in this category consist of a single test, the original regulatory exemption to the General Provisions of § 60.8(f)(1) is retained. 
D. Standards of Performance for New 
Residential Wood Heaters, New Residential Hydronic Heaters, and Forced-Air Furnaces (Subpart QQQQ) of Part 60 
The erroneous PM emission limits in 
g/MJ in § 60.5474(b)(2), (3) and (6) are corrected. 
In addition, subpart QQQQ is 
amended to add stipulations for use of the ASTM E2515–11 test method. The stipulations modify the post-test leak check procedures as well as add procedures for performing leak checks during a sampling run. The stipulations to ASTM E2515–11 are necessary as we have learned that the QA/QC requirements for leak tests required by ASTM E2515–11, section 9.6.5.1 are not sufficient to provide assurance of the sampling system integrity. Additionally, the language of ASTM E2515–11, section 9.6.5.1 currently allows for averaging the PM results from a non- leaking sampling system with those from a leaking sampling system, which effectively reduces reported PM emissions by as much as half, rendering the test method inappropriate for 
compliance determination. The language in § 60.5476(c)(5) and (6) is removed and the paragraphs are reserved. 
We revised the language in 
§ 60.5476(f) and developed new language to replace ASTM E2515–11, section 9.6.5.1 by adding § 60.5476(f)(1), which specifies appropriate post-test leak check procedures and in § 60.5476(f)(2) by adding procedures for performing leak checks during a sampling run. These modifications bring appropriate QA/QC requirements to PM measurements required by the rule and eliminate opportunity for emissions test results to be considered valid when a leaking sampling system allows dilution of the PM sample(s). This language was amended slightly based on comments received to further clarify that sample 
volume collected during the process of conducting leak checks during a test run should not be included in the overall sampling volume as it would dilute the collected sample volume were it treated in that manner. 
In § 60.5476(f), we are also requiring 
that first hour PM emissions measurements be conducted using a separate ASTM E2515–11 sampling train operated concurrently with the paired ASTM E2515–11 sampling trains used in compliance PM sampling. In this manner, the first hour PM emissions will be collected appropriately, and the compliance test measurements will not be impacted by a sampling pause for filter replacement at the one-hour mark. In § 60.5476(f), we incorporated language about filter type and size acceptance currently in § 60.5476(c)(5). Additionally, we removed language relating to EN 303–5 currently found in § 60.5476(f). 
The regulatory language in 
§ 60.5483(b) is revised to include General Provisions that were added to § 60.8(f)(2) (81 FR 59801, August 30, 2016) and were inadvertently exempted from subpart QQQQ as that rule, as promulgated in 2015, exempted § 60.8(f) in its entirety. The exemption promulgated in subpart QQQQ at § 60.5483(b) was intended for those affected sources subject to § 60.8(f), which, at the time, consisted of what is currently § 60.8(f)(1) and is specific to compliance testing results consisting of 
the arithmetic mean of three replicate tests. These modifications ensure that emissions test reporting includes all data necessary to assess and assure the quality of the reported emissions data and appropriately describes and identifies the specific unit covered by the emissions test report. Since compliance tests in this category consist of a single test, the original regulatory exemption to the General Provisions of § 60.8(f)(1) is retained. 
In subpart QQQQ, in method 28WHH, 
in section 13.8, the erroneous CO calculation instructions for equation 23 are corrected to include the summation of CO emissions over four test categories instead of three. 
E. Method 1 of Appendix A–1 of Part 60 
In method 1, the heading in section 
11.5.1 is moved to 11.5, and the word 
‘‘procedure’’ is moved to the first sentence in section 11.5.1 for clarity. Section 11.5.2 is revised to clearly specify the number of traverse points that must be used for sampling and velocity measurements once a directional flow-sensing probe procedure has been used to demonstrate that an alternative measurement site is acceptable. The last sentence of section 11.5.2, which appears unclear as to what ‘‘same traverse point number and locations’’ it is referring, is revised to instead specify the ‘‘same minimum of 40 traverse points for circular ducts and 42 points for rectangular ducts’’ that are used in the alternative measurement procedure of section 11.5.3. 
Also, table 1–2 is revised to correct 
the erroneous requirement that calls for 99.9 percent of stack diameter from the inside wall to the traverse point to 98.9 percent. 
F. Method 4 of Appendix A–3 of Part 60 
In method 4, table 4–3 is formatted 
correctly. G. Method 7 of Appendix A–4 of Part 60 
In method 7, section 10.1.3 is revised 
to change the word ‘‘should’’ to ‘‘shall’’ 
in the last sentence because the difference between the calculated concentration values and the actual concentrations are required to be less than 7 percent for all standards. 
H. Method 19 of Appendix A–7 of Part 
60 
In method 19, the erroneous equation 
19–5 is corrected. 
I. Method 25 of Appendix A–7 of Part 
60 
In method 25, a record and report 
section (section 12.9) was added to confirm that the quality control (QC) is successfully performed. Also, the erroneous figure 25–6 is corrected. 
J. Method 25C of Appendix A–7 of Part 
60 
In method 25C, in response to a 
comment, the first sentence in section 9.1 is corrected to read, ‘‘If the 3-year average annual rainfall is greater than 20 inches, verify that landfill gas sample contains less than 20 percent N
2or 5 
percent O 2.’’ Also, the nomenclature in 
section 12.1 for C N2and C mN2is revised 
to provide clarity. More specifically, C N2 
is changed from ‘‘N 2concentration in 
the diluted sample gas’’ to ‘‘N 2 
concentration in the landfill gas sample,’’ and the C
mN2is changed from 
‘‘Measured N 2concentration, fraction in 
landfill gas’’ to ‘‘Measured N 2 
concentration, diluted landfill gas sample.’’ 
K. Method 26 of Appendix A–8 of Part 
60 
In method 26, erroneous equations 
26–4 and 26–5 in sections 12.4 and 12.5, respectively, are revised to be consistent with the nomenclature in section 12.1. 
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L. Performance Specification 1 of 
Appendix B of Part 60 
In Performance Specification 1, 
references to ASTM D6216–12 (in sections 2.1, 3.1, 6.1, 8.1(1), (2)(iii), and (3)(ii), 8.2(1) through (3), 9.0, 12.1, 13.1, 13.2, and 16.0, reference 8) are replaced with ASTM D6216–20. Note: If the initial certification of the continuous opacity monitoring system (COMS) has already occurred using D6216–98, D6216–03, D6216–07, or D6216–12, it will not be necessary to recertify using D6216–20. 
Also, in Performance Specification 1, 
section 8.1(2)(iii) is revised by removing the next to the last sentence, which reads, ‘‘The opacities of the two locations or paths may be measured at different times but must represent the same process operating conditions,’’ because the statement is confusing and unclear; furthermore, it is unlikely that one would achieve the same conditions at two different times. 
M. Performance Specification 2 of 
Appendix B of Part 60 
In Performance Specification 2, in 
section 8.3.3, a sentence is added to clarify that during a calibration, the reference gas is to be introduced into the sampling system prior to any sample conditioning or filtration equipment and must pass through as much of the probe as is practical. In section 12.5, minor revisions are made to clarify that relative accuracy (RA) test results are expressed as a percent of emission rate or concentration (units of the applicable standard) and the definition of the average reference method (RM) value for Equation 2–6. 
N. Performance Specification 4B of 
Appendix B of Part 60 
The entire Performance Specification 
4B is updated to the Environmental Monitoring Management Council (EMMC) methods format used for all other performance specifications. In response to comment, some of the references to other sections are replaced 
with text. 
O. Performance Specification 6 of 
Appendix B of Part 60 
In Performance Specification 6, 
section 13.2 is revised to specifically state the relative accuracy criteria including significant figures. On October 7, 2020 (85 FR 63394), we revised section 13.2 of Performance Specification 6 to make the relative accuracy calculations and criteria consistent with Performance Specification 2 and offer an alternate calculation and criterion for low emission concentration/rate situations; however, we neglected to specifically 
cite the alternate relative accuracy criterion from Performance Specification 2 for low emission sources and to ensure consistency with Performance Specification 2 with regard to significant figures in the relative accuracy criteria. In response to comment, we are adding ‘‘you may elect to’’ to the last sentence in section 13.2 to clarify that the 10% RA is an option as opposed to a requirement. 
P. Performance Specification 12A of 
Appendix B of Part 60 
We are revising the references (in 
sections 8.4.2, 8.4.4, 8.4.5, 8.4.6.1, and 17.5 and the footnote to Figure 12A–3) to ASTM D6784, Standard Test Method for Elemental, Oxidized, Particle-Bound 
and Total Mercury in Flue Gas Generated from Coal-Fired Stationary Sources (Ontario Hydro Method), to update them from the 2002 version to the latest version, which was authorized in 2016. 
The capabilities of mercury CEMS 
have improved since initial deployment to support regulations over a decade ago. Therefore, we are revising section 13.3 to modify the alternative relative accuracy criterion such that: (1) it applies only at mercury concentrations less than 2.5 mg/scm and (2) the difference between the average reference method and CEMS values added to the confidence coefficient is now 0.5 mg/ scm. This revised criterion is consistent with revisions that we made to the mercury monitoring requirements in 40 CFR part 63, subpart UUUUU (81 FR 20172, April 6, 2016). 
Q. Performance Specification 16 of 
Appendix B of Part 60 
In Performance Specification 16, 
several corrections and modifications are made to clarify the intent of the requirements. In section 1.1, the language is revised to make it clear that if a PEMS (predictive emission monitoring system) contains a diluent component, then the diluent component must be tested as well. Also, in section 1.1, the language referring to PS–17 is removed because PS–17 was not promulgated. 
In sections 3.11 and 3.12, language is 
added to define commonly used acronyms, and in section 3.12, the language is corrected to indicate that the relative accuracy test audit (RATA) is to be conducted as specified in section 8.2. 
In section 9.1, the QA/QC Summary 
chart is corrected to reflect the language found in section 2.2, which indicates that the relative accuracy audit (RAA) is required on all PEMS and not just those classified as compliance PEMS. The QA/QC Summary Chart is also modified 
to align the criteria for a RAA with that found in section 13.5. 
In section 9.4, we proposed to correct 
the language stating a RATA is to be conducted at the normal operating level to indicate the RATA is to be conducted as specified in section 8.2. Also in section 9.4, we proposed to remove the statement that the statistical tests in section 8.3 are not required for the yearly RATA. However, based on public comment, we are not making any revisions to section 9.4 at this time. 
In section 12.3.2, we proposed to 
remove the alternative criteria language because it does not apply to F-factor determinations. However, based on public comment, we have decided not 
to make changes to section 12.3.2 at this time. 
In sections 13.1 and 13.5, the 
language is modified to add the corresponding alternative criteria in units of lb/mmBtu. Although, we did not propose a change in the criteria for applying the 2 ppm difference in the proposed rule, we agree with a public comment that the 20 ppm criteria in section 13.5 should be the same as the 10 ppm criteria in section 13.1, so section 13.5 is revised to reflect this. 
R. Procedure 1 of Appendix F of Part 60 
In Procedure 1, in section 4.1, a 
sentence is added to clarify that during 
a calibration, the reference gas is to be introduced into the sampling system prior to any sample conditioning or filtration equipment and must pass through as much of the probe as is practical. Section 5.2.3(2) is modified to refine the alternative cylinder gas audit (CGA) criteria in response to the use of analyzers with lower span values. In section 6.2, to provide clarity and clear up any confusion, the language referring to the relevant performance specification is removed, and the language referring to the use of equation 1–1 is inserted. 
S. Procedure 5 of Appendix F of Part 60 
Regulated entities have pointed out 
that we did not include criteria for the 
system integrity check required in Procedure 5. In section 2.5, we clarified that ongoing daily calibration of the Hg CEMS must be conducted using elemental mercury reference gas. This is consistent with revisions that we made to the Hg monitoring requirements in 40 CFR part 63, subpart UUUUU (81 FR 20172, April 6, 2016). We revised the title of section 4.0 and added section 4.4 to explain more explicitly the procedure for conducting the system integrity check as well as to provide the criteria for passing the check. In response to 
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comment, we changed ‘‘calendar’’ days 
to ‘‘operating’’ days in the first sentence in section 4.4 to provide harmonization with the Mercury Air Toxics Standards (MATS) Rule (40 CFR part 63, subpart UUUUU). Also, in response to comment, we revised the acceptance criteria for the system integrity check in section 4.4 to better comport with the MATS Rule. The acceptance criteria for the system integrity check now reads ‘‘The absolute value of the difference between the Hg CEMS output response and the reference gas must be less than or equal to 10.0 percent of the reference gas value or 0.8 mg/scm.’’ 
In section 5.1.3, to add clarity, we 
inserted language referring to equation 1–1 of Procedure 1 for calculating relative accuracy. 
T. General Provisions (Subpart A) of 
Part 63 
In the General Provisions of part 63, 
§ 63.14 is revised to: (1) add ASTM D6784–16 to paragraph (h) and (2) add ‘‘Standard Methods for the Examination of Waste and Wastewater’’ method 5210 to paragraph (u). 
U. National Emission Standards for 
Hazardous Air Pollutants From the Pulp and Paper Industry (Subpart S) of Part 63 
In subpart S, the existing reference in 
40 CFR 63.457(c)(4) to method 405.1 of 
part 136 of chapter 40 for the measurement of biochemical oxygen demand (BOD) is no longer valid, as method 405.1 was withdrawn in 2007. It was replaced with Biochemical Oxygen Demand Standard Methods 5210 B (72 FR 11199, March 12, 2007), which has been previously approved in test plans for measuring BOD to demonstrate compliance with the requirements of subpart S. In § 63.457(c)(4), the reference to method 405.1 is replaced with reference to method 5210B. The parent method, method 5210, which includes method 5210B, is also incorporated by reference in 40 CFR 63.14. 
V. National Emission Standards for 
Hazardous Air Pollutants From Hazardous Waste Combustors (Subpart EEE) of Part 63 
In the appendix to subpart EEE, the 
erroneous language regarding an Interference Response Test in the introductory paragraph of section 5 is removed, and section 5.3 in its entirety is removed. W. National Emission Standards for 
Hazardous Air Pollutants: Paper and Other Web Coating (Subpart JJJJ) of Part 63 
In 2009, revisions were made to 
§ 63.3360(e)(1)(viii) to clarify that the results of method 25 or method 25A were being used to determine ‘‘total organic volatile matter’’ (85 FR 41276). At the time, the use of the terminology ‘‘total gaseous non-methane organic volatile organic matter’’ in § 63.3360(e)(1)(vi) was overlooked. We are revising § 63.3360(e)(1)(vi) by removing the term ‘‘non-methane’’ to be consistent with § 63.3360(e)(1)(viii). 
X. National Emission Standards for 
Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines (Subpart ZZZZ) of Part 63 
We have received multiple inquiries 
regarding the requirements in table 4 of Subpart ZZZZ that are used to measure the exhaust gas moisture when measuring the concentration of carbon monoxide (CO), formaldehyde, or total hydrocarbon (THC) to demonstrate compliance with the rule. It was first pointed out that it is not always necessary to measure that exhaust gas moisture when measuring CO. We are adding language to all three sections of table 4 stating that that the moisture measurement is only necessary when needed to correct the CO, formaldehyde, THC and/or O
2measurements to a dry 
basis. 
Y. National Emission Standards for 
Hazardous Air Pollutants: Engine Test Cells/Stands Residual Risk and Technology Review (Subpart PPPPP) of Part 63 
In subpart PPPPP, the existing 
erroneous statement in § 63.9306(d)(2)(iv) is corrected to read, ‘‘Using a pressure sensor with measurement sensitivity of 0.002 inches water, check gauge calibration quarterly and transducer calibration monthly.’’ Also, in subpart PPPPP, the existing erroneous statement in § 63.9322(a)(1) is corrected to read, ‘‘The capture system meets the criteria in Method 204 of appendix M to 40 CFR part 51 for a permanent total enclosure (PE) and directs all the exhaust gases from the enclosure to an add-on control device.’’ 
Z. National Emission Standards for 
Hazardous Air Pollutants: Coal- and 
Oil-Fired Electric Utility Steam Generating Units (Subpart UUUUU) of Part 63 
We are revising the references in 
sections 4.1.1.5 and 4.1.1.5.1 in subpart UUUUU, appendix A, to ASTM Method D6784, Standard Test Method for Elemental, Oxidized, Particle-Bound and Total Mercury in Flue Gas Generated from Coal-Fired Stationary Sources (Ontario Hydro Method), to update them from the 2002 version to the latest version, which was authorized in 2016. In table 5, we are adding ASTM Method D6784–16 as a mercury testing option as it was inadvertently left out previously. 
AA. Method 315 of Appendix A of Part 
63 
Section 16.2 is mislabeled as section 
6.2 and is corrected. 
BB. Method 323 of Appendix A of Part 
63 
In method 323, sections 10.1 and 10.3 
are revised to require best laboratory practices. The nomenclature in section 12.1 is revised to include ‘‘b,’’ which is the intercept of the calibration curve at zero concentration and revise K
c. These 
additions are necessary because equation 323–5 in section 12.6 is revised to reflect changes in calibration procedures for calculating the mass of formaldehyde. 
V. Public Comments on the Proposed 
Rule 
Eleven comment letters were received 
from the public on the proposed rule. The public comments and the agency’s responses are summarized in the Response to Comments document located in the docket for this rule. See the 
ADDRESSES section of this preamble. 
VI. Statutory and Executive Order Reviews 
Additional information about these 
statutes and Executive orders can be found at https://www.epa.gov/laws- regulations/laws-and-executive-orders. 
A. Executive Order 12866: Regulatory 
Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review 
This action is not a significant 
regulatory action and was, therefore, not submitted to the Office of Management and Budget (OMB) for review. 
B. Paperwork Reduction Act (PRA) 
This action does not impose an 
information collection burden under the 
PRA. The amendments to test methods, performance specifications, and testing regulations only make corrections, updates, and clarifications to existing testing methodology. 
C. Regulatory Flexibility Act (RFA) 
I certify that this action will not have 
a significant economic impact on a 
substantial number of small entities 
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under the RFA. This action will not 
impose any requirements on small entities. This final rule will not impose emission measurement requirements beyond those specified in the current regulations, nor does it change any emission standard. 
D. Unfunded Mandates Reform Act 
(UMRA) 
This action does not contain any 
unfunded mandate as described in UMRA, 2 U.S.C. 1531–1538, and does not significantly or uniquely affect small governments. The action imposes no enforceable duty on any state, local, or tribal governments or the private sector. 
E. Executive Order 13132: Federalism 
This action does not have federalism 
implications. It will not have substantial 
direct effects on the states, on the relationship between the National Government and the states, or on the distribution of power and responsibilities among the various levels of government. 
F. Executive Order 13175: Consultation 
and Coordination With Indian Tribal Governments 
This action does not have tribal 
implications, as specified in Executive Order 13175. This action corrects and updates existing testing regulations. Thus, Executive Order 13175 does not apply to this action. 
G. Executive Order 13045: Protection of 
Children From Environmental Health Risks and Safety Risks 
The EPA interprets Executive Order 
13045 as applying only to those regulatory actions that concern environmental health or safety risks that the EPA has reason to believe may disproportionately affect children, per the definition of ‘‘covered regulatory action’’ in section 2–202 of the Executive order. This action is not subject to Executive Order 13045 because it does not concern an environmental health risk or safety risk. 
H. Executive Order 13211: Actions 
Concerning Regulations That Significantly Affect Energy Supply, Distribution or Use 
This action is not subject to Executive 
Order 13211 because it is not a significant regulatory action under Executive Order 12866. 
I. National Technology Transfer and 
Advancement Act and 1 CFR Part 51 
This action involves technical 
standards. The EPA used ASTM D6216– 20 for continuous opacity monitors in Performance Specification 1. The ASTM D6216–20 standard covers the 
procedure for certifying continuous opacity monitors and includes design and performance specifications, test procedures, and QA requirements to ensure that continuous opacity monitors meet minimum design and calibration requirements, necessary in part, for accurate opacity monitoring measurements in regulatory environmental opacity monitoring applications subject to 10 percent or higher opacity standards. The EPA also updated the version of ASTM D6784, a test method for elemental, oxidized, particle-bound, and total mercury in emissions from stationary sources, from the 2002 to 2016 version in the references contained in 40 CFR part 60, appendix B, Performance Specification 12A, for continuous monitoring of mercury emissions. The EPA updated the version of ASTM D6784 referenced in table 5 and appendix A of subpart UUUUU in 40 CFR part 63, for mercury emissions measurement and monitoring. 
The EPA also used the Standard 
Methods Committee Method 5210 Biochemical Oxygen Demand (BOD) from ‘‘Standard Methods for the Examination of Water and Wastewater.’’ Section B of this standard, 5-day BOD, is acceptable as an alternative to method 405.1. 
The EPA added language to correct a 
portion of the ASTM E2515–11 test method. The stipulations modified the post-test leak check procedures as well as added procedures for performing leak checks during a sampling run. The stipulations to ASTM E2515–11 are necessary as we have learned that the quality assurance/quality control (QA/ QC) requirements for leak tests required by ASTM E2515–11, section 9.6.5.1 are not sufficient to provide assurance of the sampling system integrity. 
Additionally, the language of ASTM E2515–11, section 9.6.5.1 currently allows for averaging the PM results from a non-leaking sampling system with those from a leaking sampling system which effectively reduces reported PM emissions by as much as half, rendering the test method inappropriate for compliance determination. 
J. Executive Order 12898: Federal 
Actions To Address Environmental Justice in Minority Populations and Low-Income Populations 
Executive Order 12898 (59 FR 7629, 
February 16, 1994) directs Federal agencies, to the greatest extent practicable and permitted by law, to make environmental justice part of their mission by identifying and addressing, as appropriate, disproportionately high and adverse human health or environmental effects of their programs, policies, and activities on minority populations (people of color) and low- income populations. 
The EPA believes that this type of 
action does not concern human health or environmental conditions and, therefore, cannot be evaluated with respect to potentially disproportionate and adverse effects on people of color, low-income populations and/or indigenous peoples because it does not establish an environmental health or safety standard. This action corrects, updates, and provides clarity to existing testing regulations. 
K. Congressional Review Act (CRA) 
This action is subject to the CRA, and 
the EPA will submit a rule report to 
each house of the Congress and to the Comptroller General of the United States. This action is not a ‘‘major rule’’ as defined by 5 U.S.C. 804(2). 
List of Subjects 40 CFR Part 51 
Environmental protection, Air 
pollution control, Performance 
specifications, Test methods and procedures. 
40 CFR Part 60 
Environmental protection, Air 
pollution control, Incorporation by 
reference, Performance specifications, Test methods and procedures. 
40 CFR Part 63 
Environmental protection, Air 
pollution control, Incorporation by 
reference, Performance specifications, Test methods and procedures. 
Michael S. Regan, 
Administrator. 
For the reasons set forth in the 
preamble, the Environmental Protection 
Agency amends title 40, chapter I of the Code of Federal Regulations as follows: 
PART 51—REQUIREMENTS FOR 
PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS 
■1. The authority citation for part 51 
continues to read as follows: 
Authority: 23 U.S.C. 101; 42 U.S.C. 7401– 
7671q. 
■2. Amend appendix M to part 51 in 
section 12.5 of method 201A by revising equation 25 to read as follows: 
Appendix M to Part 51—Recommended 
Test Methods for State Implementation Plans 
* * * * * 
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Method 201A—Determination of PM 10and 
PM 2.5Emissions From Stationary Sources 
(Constant Sampling Rate Procedure) 
* * * * * 
12.0 Calculations and Data Analysis 
* * * * * 
12.5 * * * 
* * * * * 
PART 60—STANDARDS OF 
PERFORMANCE FOR NEW STATIONARY SOURCES 
■3. The authority citation of part 60 
continues to read as follows: 
Authority: 42 U.S.C. 7401 et seq. 
Subpart A—General Provisions 
■4. Amend § 60.17 by: 
■a. Revising paragraphs (h)(182) and 
(195); 
■b. Redesignating paragraphs (h)(196) 
through (217) as paragraphs (h)(197) through (218) respectively; and 
■c. Adding new paragraph (h)(196). 
The revisions and addition read as 
follows: 
§ 60.17 Incorporations by reference. 
* * * * * 
(h) * * * 
(182) ASTM D6216–20, Standard 
Practice for Opacity Monitor 
Manufacturers to Certify Conformance with Design and Performance Specifications, approved September 1, 2020; IBR approved for appendix B to part 60. 
* * * * * 
(195) ASTM D6784–02 (Reapproved 
2008), Standard Test Method for 
Elemental, Oxidized, Particle-Bound and Total Mercury in Flue Gas Generated from Coal-Fired Stationary Sources (Ontario Hydro Method), approved April 1, 2008; IBR approved for § 60.56c(b). 
(196) ASTM D6784–16, Standard Test 
Method for Elemental, Oxidized, Particle-Bound and Total Mercury in Flue Gas Generated from Coal-Fired Stationary Sources (Ontario Hydro Method), approved March 1, 2016; IBR approved for appendix B to part 60. 
* * * * * 
Subpart AAA—Standards of 
Performance for New Residential Wood Heaters 
■5. Amend § 60.534 by revising 
paragraphs (c) and (d) to read as follows: § 60.534 What test methods and 
procedures must I use to determine compliance with the standards and requirements for certification? 
* * * * * 
(c) For affected wood heaters subject 
to the 2015 and 2020 particulate matter 
emission standards specified in § 60.532(a) through (c), particulate matter emission concentrations must be measured with ASTM E2515–11 (IBR, see § 60.17) with the following exceptions: eliminate section 9.6.5.1 of ASTM E2515–11 and perform the post- test leak checks as described in paragraph (c)(1) of this section. Additionally, if a component change of 
either sampling train is needed during sampling, then perform the leak check specified in paragraph (c)(2) of this section. Four-inch filters and Teflon membrane filters or Teflon-coated glass fiber filters may be used in ASTM E2515–11. 
(1) Post-test leak check. A leak check 
of each sampling train is mandatory at the conclusion of each sampling run before sample recovery. The leak check must be performed in accordance with the procedures of ASTM E2515–11, section 9.6.4.1 (IBR, see § 60.17), except that it must be conducted at a vacuum equal to or greater than the maximum value reached during the sampling run. If the leakage rate is found to be no greater than 0.0003 m
3/min (0.01 cfm) 
or 4% of the average sampling rate (whichever is less), the leak check results are acceptable. If a higher leakage rate is obtained, the sampling run is invalid. 
(2) Leak checks during sample run. If, 
during a sampling run, a component (e.g., filter assembly) change becomes 
necessary, a leak check must be conducted immediately before the change is made. Record the sample volume before and after the leak test. The sample volume collected during any leak checks must not be included in the total sample volume for the test run. The leak check must be done according to the procedure outlined in ASTM E2515–11, section 9.6.4.1 (IBR, see § 60.17), except that it must be done at a vacuum equal to or greater than the maximum value recorded up to that point in the sampling run. If the leakage rate is found to be no greater than 0.0003 m
3/min (0.01 cfm) or 4% of the 
average sampling rate (whichever is less), the leak check results are acceptable. If a higher leakage rate is obtained, the sampling run is invalid. 
Note 1 to paragraph (c): Immediately after 
component changes, leak checks are optional 
but highly recommended. If such leak checks are done, the procedure in paragraph (c)(1) of this section should be used. (d) For all tests conducted using 
ASTM E2515–11 (IBR, see § 60.17), with 
the exceptions described in paragraphs (c)(1) and (2) of this section, and pursuant to this section, the manufacturer and approved test laboratory must also measure the first hour of particulate matter emissions for each test run by sampling with a third, identical and independent sampling train operated concurrently for the first hour of PM paired train compliance testing according to paragraph (c) of this section. The manufacturer and approved test laboratory must report the test results from this third train separately as the first hour emissions. 
* * * * * 
■6. Amend § 60.539b by revising 
paragraph (b) to read as follows: 
§ 60.539b What parts of the General 
Provisions do not apply to me? 
* * * * * 
(b) Section 60.8(a), (c), (d), (e), (f)(1), 
and (g); 
* * * * * 
Subpart QQQQ—Standards of 
Performance for New Residential Hydronic Heaters and Forced-Air Furnaces 
■7. Amend § 60.5474 by revising 
paragraphs (b)(2), (3), and (6) to read as follows: 
§ 60.5474 What standards and 
requirements must I meet and by when? 
* * * * * 
(b) * * * 
(2) 2020 residential hydronic heater 
particulate matter emission limit: 0.10 lb/mmBtu (0.043 g/MJ) heat output per individual burn rate as determined by the crib wood test methods and procedures in § 60.5476 or an alternative crib wood test method approved by the Administrator. 
(3) 2020 residential hydronic heater 
cord wood alternative compliance option for particulate matter emission limit: 0.15 lb/mmBtu (0.064 g/MJ) heat output per individual burn rate as determined by the cord wood test methods and procedures in § 60.5476 or an alternative cord wood test method approved by the Administrator. 
* * * * * 
(6) 2020 forced-air furnace particulate 
matter emission limit: 0.15 lb/mmBtu 
(0.064 g/MJ) heat output per individual burn rate as determined by the cord wood test methods and procedures in § 60.5476 or cord wood test methods approved by the Administrator. 
* * * * * 
■8. Amend § 60.5476 by: 
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■a. Removing paragraphs (c)(5) and (6); 
and 
■b. Revising paragraph (f). 
The revision reads as follows: 
§ 60.5476 What test methods and 
procedures must I use to determine compliance with the standards and requirements for certification? 
* * * * * 
(f) For affected wood heaters subject 
to the particulate matter emission 
standards, particulate matter emission concentrations must be measured with ASTM E2515–11 (IBR, see § 60.17) with the following exceptions, eliminate section 9.6.5.1 of ASTM E2515–11 and perform the post-test leak checks as described in paragraph (f)(1) of this section. Additionally, if a component change of either sampling train is needed during sampling, then perform the leak check specified in paragraph (f)(2) of this section. Four-inch filters and Teflon membrane filters or Teflon- coated glass fiber filters may be used in ASTM E2515–11. For all tests conducted using ASTM 2515–11, with 
the exceptions described in paragraphs (f)(1) and (2) of this section, the manufacturer and approved test laboratory must also measure the first hour of particulate matter emissions for each test run by sampling with a third, identical and independent sampling train operated concurrently with the first hour of PM paired train compliance testing. The manufacturer and approved test laboratory must report the test results for this third train separately as the first hour emissions. 
(1) Post-test leak check. A leak check 
of each sampling train is mandatory at the conclusion of each sampling run before sample recovery. The leak check must be performed in accordance with the procedures of ASTM E2515–11, section 9.6.4.1 (IBR, see § 60.17), except that it must be conducted at a vacuum equal to or greater than the maximum value reached during the sampling run. If the leakage rate is found to be no greater than 0.0003 m
3/min (0.01 cfm) 
or 4% of the average sampling rate (whichever is less), the leak check results are acceptable. If a higher leakage rate is obtained, the sampling run is invalid. 
(2) Leak checks during sample run. If, 
during a sampling run, a component (e.g., filter assembly) change becomes 
necessary, a leak check must be conducted immediately before the change is made. Record the sample volume before and after the leak test. The sample volume collected during any leak checks must not be included in the total sample volume for the test run. The leak check must be done according to the procedure outlined in ASTM E2515–11, section 9.6.4.1 (IBR, see § 60.17), except that it must be done at a vacuum equal to or greater than the maximum value recorded up to that point in the sampling run. If the leakage rate is found to be no greater than 0.0003 m
3/min (0.01 cfm) or 4% of the 
average sampling rate (whichever is less), the leak check results are acceptable. If a higher leakage rate is obtained, the sampling run is invalid. 
Note 1 to paragraph (f): Immediately after 
component changes, leak checks are optional 
but highly recommended. If such leak checks are done, the procedure in paragraph (f)(1) of this section should be used. 
* * * * * 
■9. Amend § 60.5483 by revising 
paragraph (b) to read as follows: 
§ 60.5483 What parts of the General Provisions do not apply to me? 
* * * * * 
(b) Section 60.8(a), (c), (d), (e), (f)(1), 
and (g); 
* * * * * 
■10. Amend appendix A–1 to part 60 
by revising sections 11.5, 11.5.1, and 
11.5.2, and table 1–2 under the heading ‘‘17.0 Tables, Diagrams, Flowcharts, and Validation Data’’ in method 1 to read as follows: 
Appendix A–1 to Part 60—Test 
Methods 1 Through 2F 
* * * * * Method 1—Sample and Velocity Traverses 
for Stationary Sources 
* * * * * 
11.0 Procedure 
* * * * * 
11.5 Alternative Measurement Site 
Selection Procedure. The alternative site 
selection procedure may be used to determine the rotation angles in lieu of the procedure outlined in section 11.4 of this method. 
11.5.1 This alternative procedure applies 
to sources where measurement locations are less than 2 equivalent or duct diameters downstream or less than one-half duct diameter upstream from a flow disturbance. The alternative should be limited to ducts larger than 24 inches in diameter where blockage and wall effects are minimal. A directional flow-sensing probe is used to measure pitch and yaw angles of the gas flow at 40 or more traverse points; the resultant angle is calculated and compared with acceptable criteria for mean and standard deviation. 
Note: Both the pitch and yaw angles are 
measured from a line passing through the traverse point and parallel to the stack axis. The pitch angle is the angle of the gas flow component in the plane that INCLUDES the traverse line and is parallel to the stack axis. The yaw angle is the angle of the gas flow component in the plane PERPENDICULAR to 
the traverse line at the traverse point and is measured from the line passing through the traverse point and parallel to the stack axis. 
11.5.2 Traverse Points. Use a minimum of 
40 traverse points for circular ducts and 42 points for rectangular ducts for the gas flow angle determinations. Follow the procedure outlined in section 11.3 and table 1–1 or 1– 2 of this method for the location and layout of the traverse points. If the alternative measurement location is determined to be acceptable according to the criteria in this alternative procedure, use the same minimum of 40 traverse points for circular ducts and 42 points for rectangular ducts that were used in the alternative measurement procedure for future sampling and velocity measurements. 
* * * * * 
17.0 Tables, Diagrams, Flowcharts, and 
Validation Data 
* * * * * 
TABLE 1–2—L OCATION OF TRAVERSE POINTS IN CIRCULAR STACKS  
[Percent of stack diameter from inside wall to traverse point] 
Traverse point number on a diameter Number of traverse points on a diameter 
2 4 6 8 10 12 14 16 18 20 22 24 
1 ................................................................ 14.6 6.7 4.4 3.2 2.6 2.1 1.8 1.6 1.4 1.3 1.1 1.1 
2 ................................................................ 85.4 25.0 14.6 10.5 8.2 6.7 5.7 4.9 4.4 3.9 3.5 3.2 
3 ................................................................ .................... 75.0 29.6 19.4 14.6 11.8 9.9 8.5 7.5 6.7 6.0 5.5 
4 ................................................................ .................... 93.3 70.4 32.3 22.6 17.7 14.6 12.5 10.9 9. 7 8.7 7.9 
5 ................................................................ .................... ............ 85.4 67.7 34.2 25.0 20.1 16.9 14.6 12.9 11.6 10.5 
6 ................................................................ .................... ............ 95.6 80.6 65.8 35.6 26.9 22.0 18.8 16.5 14.6 13.2 
7 ................................................................ .................... ............ ............ 89.5 77.4 64.4 36. 6 28.3 23.6 20.4 18.0 16.1 
8 ................................................................ .................... ............ ............ 96.8 85.4 75.0 63. 4 37.5 29.6 25.0 21.8 19.4 
9 ................................................................ .................... ............ ............ ............ 91.8 82.3 73.1 62.5 38.2 30.6 26.2 23.0 
10 .............................................................. .................... ............ ............ ............ 97.4 88.2 79.9 71.7 61.8 38.8 31.5 27.2 
11 .............................................................. .................... ............ ............ ............ ....... ..... 93.3 85.4 78.0 70.4 61.2 39.3 32.3 
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TABLE 1–2—L OCATION OF TRAVERSE POINTS IN CIRCULAR STACKS —Continued 
[Percent of stack diameter from inside wall to traverse point] 
Traverse point number on a diameter Number of traverse points on a diameter 
2 4 6 8 10 12 14 16 18 20 22 24 
12 .............................................................. .................... ............ ............ ............ ....... ..... 97.9 90.1 83.1 76.4 69.4 60.7 39.8 
13 .............................................................. .................... ............ ............ ............ ....... ..... ............ 94.3 87.5 81.2 75.0 68.5 60.2 
14 .............................................................. .................... ............ ............ ............ ....... ..... ............ 98.2 91.5 85.4 79.6 73.8 67.7 
15 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ 95.1 89.1 83.5 78.2 72.8 
16 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ 98.4 92.5 87.1 82.0 77.0 
17 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ ............ 95.6 90.3 85.4 80.6 
18 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ ............ 98.6 93.3 88.4 83.9 
19 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ ............ ............ 96.1 91.3 86.8 
20 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ ............ ............ 98.7 94.0 89.5 
21 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ ............ ............ ............ 96.5 92.1 
22 .............................................................. .................... ............ ............ ............ ....... ..... ............ ............ ............ ............ ............ 98.9 94.5 
23 .............................................................. .................... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ 96.8 
24 .............................................................. .................... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............ 98.9 
* * * * * 
■11. Amend appendix A–3 to part 60 
by revising figure 4–3 under the heading 
‘‘18.0 Tables, Diagrams, Flowcharts, and Validation Data’’ in method 4 to read as follows: Appendix A–3 to Part 60—Test 
Methods 4 Through 5I 
* * * * * 
Method 4—Determination of Moisture 
Content in Stack Gases 
* * * * * 18.0 Tables, Diagrams, Flowcharts, and 
Validation Data 
* * * * * 
Figure 4–3 Moisture Field Data Sheet 
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* * * * * 
■12. Amend appendix A–4 to part 60 
by revising section 10.1.3 in method 7 
to read as follows: 
Appendix A–4 to Part 60—Test 
Methods 6 Through 10B 
* * * * * 
Method 7—Determination of Nitrogen Oxide 
Emissions From Stationary Sources 
* * * * * 
10.0 Calibration and Standardization 
* * * * * 
10.1.3 Spectrophotometer Calibration 
Quality Control. Multiply the absorbance value obtained for each standard by the K
c 
factor (reciprocal of the least squares slope) to determine the distance each calibration 
point lies from the theoretical calibration line. The difference between the calculated 
concentration values and the actual concentrations (i.e., 100, 200, 300, and 400 mg 
NO
2) shall be less than 7 percent for all 
standards. 
* * * * * 
■13. Amend appendix A–7 to part 60 
by: 
■a. Revising equation 19–5 in section 
12.2.3.2 in method 19; 
■b. In method 25: 
■i. Adding sections 12.9 and 12.9.1 
through 12.9.16; and 
■ii. Revising figure 25–6 under the 
heading ‘‘17.0 Tables, Diagrams, 
Flowcharts, and Validation Data’’; and 
■c. In method 25C: ■i. Revising section 9.1; and 
■ii. Revising the entries ‘‘C N2’’ and 
‘‘CmN2’’ in section 12.1. 
The revisions and additions read as 
follows: 
Appendix A–7 to Part 60—Test 
Methods 19 Through 25E 
* * * * * 
Method 19—Determination of Sulfur Dioxide 
Removal Efficiency and Particulate Matter, Sulfur Dioxide, and Nitrogen Oxide Emission Rates 
* * * * * 
12.0 Data Analysis and Calculations 
* * * * * 
12.2.3.2 * * * 
* * * * * 
Method 25—Determination of Total Gaseous Nonmethane Organic Emissions as Carbon 
* * * * * 
12.0 Data Analysis and Calculations 
* * * * * 
12.9 Record and Report Initial Method 
Checks as follows: 
12.9.1 Calibration and Linearity Check 
Gas Certifications (sections 7.2 and 7.4 of this 
method). 
12.9.2 Condensate Trap Blank Check 
(section 8.1.1 of this method). 
12.9.3 Pretest Leak-Check (section 8.1.4 
of this method). 12.9.4 Condensate Recovery Apparatus 
(section 10.1.1 of this method). 
12.9.5 Carrier Gas and Auxiliary O 2Blank 
Check (section 10.1.1.1 of this method). 
12.9.6 Oxidation Catalyst Efficiency 
Check (section 10.1.1.2 of this method). 
12.9.7 System Performance Check 
(section 10.1.1.3 of this method). 
12.9.8 Oxidation Catalyst Efficiency 
Check (section 10.1.2.1 of this method). 
12.9.9 Reduction Catalyst Efficiency 
Check (section 10.1.2.2 of this method). 
12.9.10 NMO Analyzer Linearity Check 
Calibration (section 10.1.2.3 of this method). 
12.9.11 NMO Analyzer Daily Calibration 
(section 10.2 of this method). 12.9.12 Condensate Recovery (section 
11.1 of this method). 
12.9.13 Daily Performance Checks 
(section 11.1.1 of this method). 
12.9.14 Leak-Check (section 11.1.1.1 of 
this method). 
12.9.15 System Background Test (section 
11.1.1.2 of this method). 
12.9.16 Oxidation Catalyst Efficiency 
Check (section 11.1.1.3 of this method). 
* * * * * 
17.0 Tables, Diagrams, Flowcharts, and 
Validation Data 
* * * * * 
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Figure 25–6. Nonmethane Organic Analyzer 
(NMO) 
* * * * * Method 25C—Determination of Nonmethane 
Organic Compounds (NMOC) in Landfill Gases 
* * * * * 9.0 Quality Control 
9.1 Miscellaneous Quality Control 
Measures. 
Section Quality control measure Effect 
8.4.2 Verify that landfill gas sample contains less than 20 percent N 2or 5 percent O 2. 
Landfills with 3-year average annual rainfalls equal to or less than 20 inches an-
nual rainfalls samples are acceptable when the N 2to O 2concentration ratio is 
greater than 3.71.Ensures that ambient air was not drawn into the landfill gas 
sample and gas was sampled from an appropriate location. 
10.1, 10.2 NMOC analyzer initial and daily performance checks ............................................... Ensures precision of analytical results. 
* * * * * 
12.0 Data Analysis and Calculations 
* * * * * 
12.1 Nomenclature 
* * * * * 
CN2= N 2concentration in the landfill gas 
sample. 
CmN2= Measured N 2concentration, diluted 
landfill gas sample. 
* * * * * ■14. Amend appendix A–8 to part 60 
by: 
■a. Revising sections 12.4 and 12.5 in 
method 26. 
■b. Revising section 13.8 in test method 
28WHH. 
The revisions read as follows: 
Appendix A–8 to Part 60—Test 
Methods 26 Through 30B 
* * * * * Method 26—Determination of Hydrogen 
Halide and Halogen Emissions From Stationary Sources Non-Isokinetic Method 
* * * * * 
12.0 Data Analysis and Calculations 
* * * * * 
12.4 Total mg HCl, HBr, or HF Per 
Sample. 
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12.5 Total mg Cl 2or Br 2Per Sample. 
* * * * * Test Method 28—WHH for Measurement of 
Particulate Emissions and Heating Efficiency of Wood-Fired Hydronic Heating Appliances 
* * * * * 
13.0 Calculation of Results 
* * * * * 13.8 Carbon Monoxide Emissions 
For each minute of the test period, the 
carbon monoxide emissions rate (g/min) shall 
be calculated as: 
Total CO emissions for each of the four test 
periods (CO_ 1, CO_ 2, CO_ 3, CO_ 4) shall be 
calculated as the sum of the emissions rates 
for each of the 1-minute intervals. Total CO emissions for the test run, CO
T, shall be 
calculated as the sum of CO_ 1, CO_ 2, CO_ 3 
and CO_ 4. 
* * * * * 
■15. Amend appendix B to part 60 by: 
■a. Revising sections 2.1, 3.1, 6.1, 
8.1(1), (2)(iii), and (3)(ii), 8.2(1) through 
(3), 9.0, 12.1, 13.1, 13.2, and 16.0, reference 8, in performance specification 1; 
■b. Revising sections 8.3.3 and 12.5 in 
performance specification 2; 
■c. Revising performance specification 
4B; 
■d. Revising section 13.2 in 
performance specification 6; 
■e. Revising sections 8.4.2, 8.4.4, 8.4.5, 
8.4.6.1, 13.3, and 17.5, and figure 12A– 3 in section 18 in performance specification 12A; and 
■f. Revising sections 1.1, 3.11, 3.12, 9.1, 
13.1, and 13.5 in performance specification 16. 
The revisions read as follows: 
Appendix B to Part 60—Performance Specifications 
* * * * * 
Performance Specification 1—Specifications 
and Test Procedures for Continuous Opacity Monitoring Systems in Stationary Sources 
* * * * * 
2.0 What are the basic requirements of PS– 1? 
* * * * * 
2.1 ASTM D6216–20 (IBR, see § 60.17) is 
the reference for design specifications, manufacturer’s performance specifications, and test procedures. The opacity monitor manufacturer must periodically select and test an opacity monitor, that is representative of a group of monitors produced during a specified period or lot, for conformance with the design specifications in ASTM D6216–20. The opacity monitor manufacturer must test each opacity monitor for conformance with the manufacturer’s performance specifications in ASTM D6216–20. Note: If 
the initial certification of the opacity monitor occurred before May 30, 2023, using D6216– 98, D6216–03, D6216–07, or D6216–12, it is not necessary to recertify using D6216–20. 
* * * * * 3.0 What special definitions apply to PS–1? 
3.1 All definitions and discussions from 
section 3 of ASTM D6216–20 are applicable to PS–1. 
* * * * * 
6.0 What equipment and supplies do I need? 
6.1 Continuous Opacity Monitoring 
System. You, as owner or operator, are 
responsible for purchasing an opacity monitor that meets the specifications of ASTM D6216–20, including a suitable data recorder or automated data acquisition handling system. Example data recorders include an analog strip chart recorder or more appropriately an electronic data acquisition and reporting system with an input signal range compatible with the analyzer output. 
* * * * * 
8.0 What performance procedures are required to comply with PS–1? 
* * * * * 
8.1 * * * (1) You must purchase an opacity monitor 
that complies with ASTM D6216–20 and obtain a certificate of conformance from the opacity monitor manufacturer. 
(2) * * * (iii) Alternative Locations and Light Beam 
Paths. You may select locations and light beam paths, other than those cited in section 8.1(2)(ii) of this method, if you demonstrate, to the satisfaction of the Administrator or delegated agent, that the average opacity measured at the alternative location or path is equivalent to the opacity as measured at a location meeting the criteria of sections 8.1(2)(i) and (ii) of this method. The opacity at the alternative location is considered equivalent if (1) the average opacity value measured at the alternative location is within ±10 percent of the average opacity value measured at the location meeting the installation criteria, and (2) the difference between any two average opacity values is less than 2 percent opacity (absolute). You use the following procedure to conduct this demonstration: simultaneously measure the opacities at the two locations or paths for a minimum period of time (e.g., 180-minutes) 
covering the range of normal operating conditions and compare the results. You may use alternative procedures for determining acceptable locations if those procedures are approved by the Administrator. 
(3) * * * (ii) Calibration Error Check. Conduct a 
three-point calibration error test using three calibration attenuators that produce outlet 
pathlength corrected, single-pass opacity values shown in ASTM D6216–20, section 7.5. If your applicable limit is less than 10 percent opacity, use attenuators as described in ASTM D6216–20, section 7.5 for applicable standards of 10 to 19 percent opacity. Confirm the external audit device produces the proper zero value on the COMS data recorder. Separately, insert each calibration attenuators (low, mid, and high- level) into the external audit device. While inserting each attenuator, (1) ensure that the entire light beam passes through the attenuator, (2) minimize interference from reflected light, and (3) leave the attenuator in place for at least two times the shortest recording interval on the COMS data recorder. Make a total of five nonconsecutive readings for each attenuator. At the end of the test, correlate each attenuator insertion to 
the corresponding value from the data recorder. Subtract the single-pass calibration attenuator values corrected to the stack exit conditions from the COMS responses. Calculate the arithmetic mean difference, standard deviation, and confidence coefficient of the five measurements value using equations 1–3, 1–4, and 1–5 of this method. Calculate the calibration error as the sum of the absolute value of the mean difference and the 95 percent confidence coefficient for each of the three test attenuators using equation 1–6 of this method. Report the calibration error test results for each of the three attenuators. 
* * * * * 
8.2 * * * (1) Conduct the verification procedures for 
design specifications in section 6 of ASTM D6216–20. 
(2) Conduct the verification procedures for 
performance specifications in section 7 of ASTM D6216–20. 
(3) Provide to the owner or operator a 
report of the opacity monitor’s conformance to the design and performance specifications required in sections 6 and 7 of ASTM D6216– 20 in accordance with the reporting requirements of section 9 in ASTM D6216– 20. 
9.0 What quality control measures are 
required by PS–1? 
Opacity monitor manufacturers must 
initiate a quality program following the requirements of ASTM D6216–20, section 8. The quality program must include (1) a quality system and (2) a corrective action program. 
* * * * * 
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12.0 What calculations are needed for PS– 
1? 
12.1 Desired Attenuator Values. Calculate 
the desired attenuator value corrected to the 
emission outlet pathlength as follows: 
Where: 
OP 1= Nominal opacity value of required 
low-, mid-, or high-range calibration 
attenuators. 
OP 2= Desired attenuator opacity value from 
ASTM D6216–20, section 7.5 at the opacity limit required by the applicable subpart of this part. 
L
1= Monitoring pathlength. 
L2= Emission outlet pathlength. 
* * * * * 
13.0 What specifications does a COMS 
have to meet for certification? 
* * * * * 13.1 Design Specifications. The opacity 
monitoring equipment must comply with the 
design specifications of ASTM D6216–20. 
13.2 Manufacturer’s Performance 
Specifications. The opacity monitor must comply with the manufacturer’s performance specifications of ASTM D6216–20. 
* * * * * 
16.0 Which references are relevant to this 
method? 
* * * * * 
8. ASTM D6216–20: Standard Practice for 
Opacity Monitor Manufacturers to Certify 
Conformance with Design and Performance Specifications. American Society for Testing and Materials (ASTM). September 2020. 
* * * * * 
Performance Specification 2—Specifications 
and Test Procedures for SO 2and NO X 
Continuous Emission Monitoring Systems in Stationary Sources 
* * * * * 8.0 Performance Specification Test Procedure 
* * * * * 
8.3.3 Conduct the CD test at the two 
points specified in section 6.1.2 of this method. Introduce to the CEMS the reference gases, gas cells, or optical filters (these need not be certified). When using reference gases, introduce the reference gas prior to any sample conditioning or filtration equipment and ensure that it passes through all filters, scrubbers, conditioners, and other monitor components used during normal sampling. The reference gas should pass through as much of the sampling probe as practical. Record the CEMS response and subtract this value from the reference value (see example data sheet in figure 2–1 of this method). 
* * * * * 
12.0 Calculations and Data Analysis 
* * * * * 
12.5 Relative Accuracy. Calculate the RA, 
expressed as a percentage, of a set of data as follows: 
Where: 
|d¯| = Absolute value of the mean differences 
(from equation 2–3 of this method). 
|CC| = Absolute value of the confidence 
coefficient (from equation 2–3 of this 
method). 
RM= Average RM value. In cases where the 
average emissions for the test are less than 50 percent of the applicable 
emission standard, substitute the applicable emission standard value in the denominator of equation 2–6 of this method in place of the average RM value. In all other cases, use 
RM. 
* * * * * 
Performance Specification 4B— Specifications and Test Procedures for Carbon Monoxide and Oxygen Continuous Monitoring Systems in Stationary Sources 
1.0 Scope and Application 
1.1. Analytes. 
Analyte CAS No. 
Carbon Monoxide (CO) ........ 630–08–0 
Oxygen (O 2) ......................... 7782–44–7 
1.2. Applicability. 
1.2.1. This specification is to be used for 
evaluating the acceptability of carbon monoxide (CO) and oxygen (O
2) continuous 
emission monitoring systems (CEMS) at the time of or soon after installation and whenever specified in this part. The CEMS may include, for certain stationary sources, (a) flow monitoring equipment to allow measurement of the dry volume of stack effluent sampled, and (b) an automatic sampling system. 
1.2.2. This specification is not designed to 
evaluate the installed CEMS’ performance over an extended period of time, nor does it 
identify specific calibration techniques and auxiliary procedures to assess the CEMS’ performance. The source owner or operator, however, is responsible to properly calibrate, maintain, and operate the CEMS. To evaluate the CEMS’ performance, the Administrator may require, under section 114 of the Act, the operator to conduct CEMS performance evaluations at times other than the initial 
test. 
1.2.3. The definitions, installation, and 
measurement location specifications, test procedures, data reduction procedures, reporting requirements, and bibliography are the same as in Performance Specification (PS) 3 (for O
2) and PS 4A (for CO) of this 
appendix except as otherwise noted in this specification. 
2.0 Summary of Performance Specification 
Installation and measurement location 
specifications, performance specifications, 
test procedures, and data reduction procedures are included in this specification. Reference method tests, calibration error tests, calibration drift tests, and interferant tests are conducted to determine conformance of the CEMS with the specification. 
3.0 Definitions 
The definitions are the same as in section 
3.0 of PS 2 with the following definitions 
added: 
3.1. Continuous Emission Monitoring 
System (CEMS). This definition is the same as section 3.0 of PS 2 with the following addition. A continuous monitor is one in which the sample to be analyzed passes the measurement section of the analyzer without interruption. 
3.2. Response Time (RT). The time interval 
between the start of a step change in the system input and when the pollutant 
analyzer output reaches 95 percent of the final value. 
3.3. Calibration Error (CE). The difference 
between the concentration indicated by the 
CEMS and the known concentration generated by a calibration source when the entire CEMS, including the sampling interface is challenged. A CE test procedure is performed to document the accuracy and linearity of the CEMS over the entire measurement range. 
4.0 Interferences [Reserved] 5.0 Safety 
This performance specification may 
involve hazardous materials, operations, and 
equipment. This performance specification may not address all of the safety problems associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and determine the applicable regulatory limitations prior to performing this performance specification. The CEMS user’s manual should be consulted for specific precautions to be taken with regard to the analytical procedures. 
6.0 Equipment and Supplies 
Same as section 6.0 of PS 2, except for the 
following: 
6.1 Data Recorder Scale. For O
2, same as 
specified in PS 3, except that the span must 
be 25 percent. The span of the O 2may be 
higher if the O 2concentration at the sampling 
point can be greater than 25 percent. For CO, same as specified in PS 4A, except that the low-range span must be 200 ppm and the high range span must be 3000 ppm. In addition, the scale for both CEMS must record all readings within a measurement range with a resolution of 0.5 percent. 
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7.0 Reagents and Standards 
8.0 Sample Collection, Preservation, 
Storage, and Transport 
8.1. Installation and Measurement Location 
Specifications. 
8.1.1. The CEMS Installation. This 
specification is the same as section 8.1.1 of 
PS 2 with the following additions. Both the CO and O
2monitors should be installed at 
the same general location. If this is not possible, they may be installed at different locations if the effluent gases at both sample locations are not stratified and there is no in- leakage of air between sampling locations. 
8.1.2. Measurement Location. Same as 
section 8.1.2 of PS 2. 
8.1.2.1. Point CEMS. The measurement 
point should be within or centrally located over the centroidal area of the stack or duct cross section. 
8.1.2.2. Path CEMS. The effective 
measurement path should: (1) have at least 70 percent of the path within the inner 50 percent of the stack or duct cross sectional area, or (2) be centrally located over any part of the centroidal area. 
8.1.3. Reference Method (RM) 
Measurement Location and Traverse Points. 
This specification is the same as section 
8.1.3 of PS 2 with the following additions. When pollutant concentration changes are due solely to diluent leakage and CO and O
2 
are simultaneously measured at the same location, one half diameter may be used in place of two equivalent diameters. 
8.2 Pretest Preparation. Install the CEMS, 
prepare the RM test site according to the specifications in section 8.1 of this method, and prepare the CEMS for operation according to the manufacturer’s written instructions. 
8.3 Stratification Test Procedure. 
Stratification is defined as the difference in excess of 10 percent between the average concentration in the duct or stack and the concentration at any point more than 1.0 meter from the duct or stack wall. To determine whether effluent stratification exists, a dual probe system should be used to determine the average effluent concentration while measurements at each traverse point are being made. One probe, located at the stack or duct centroid, is used as a stationary reference point to indicate change in the effluent concentration over time. The second probe is used for sampling at the traverse points specified in method 1 in appendix A to this part. The monitoring 
system samples sequentially at the reference and traverse points throughout the testing period for five minutes at each point. 
8.4 Calibration Drift (CD) Test Procedure. 
Same as section 8.3 in PS 2. Note: The CE and RT tests must be 
conducted during the CD test period. 
8.5 Calibration Error Test Procedure. 
Challenge each monitor (both low and high range CO and O
2) with zero gas and EPA 
Protocol 1 cylinder gases at three measurement points within the ranges specified in table 4B–1 of this method (in section 18.0). 
Operate each monitor in its normal 
sampling mode as nearly as possible. The calibration gas must be injected into the sample system as close to the sampling probe outlet as practical and should pass through all CEMS components used during normal sampling. Challenge the CEMS three non- consecutive times at each measurement point and record the responses. The duration of each gas injection should be sufficient to ensure that the CEMS surfaces are conditioned. 
8.6 Response Time Test Procedure. Same 
as section 8.3 in PS 4A and must be carried out for both the CO and O
2monitors. 
8.7 Relative Accuracy Test Procedure. 
Sampling Strategy for Reference Method (RM) Tests, Number of RM Tests, and Correlation of RM and CEMS Data are the 
same as PS 2, sections 8.4.3, 8.4.4, and 8.4.5, respectively. 
9.0 Quality Control [Reserved] 10.0 Calibration and Standardization 
[Reserved] 
11.0 Analytical Procedure 
Sample collection and analysis are 
concurrent for this performance specification 
(see section 8.0 of this method). Refer to the RM for specific analytical procedures. 
12.0 Calculation and Data Analysis 
Summarize the results on a data sheet as 
shown in figure 4B–1 of this method (in 
section 18.0). 
Calibration Error (CE) is the average the 
differences between the instrument response and the certified cylinder gas value for each gas. Calculate the CE results for the CO monitor according to: 
Where: 
d = mean difference between the CEMS 
response and the known reference 
concentration, and 
FS = span value. 
The CE for the O 2monitor is the average 
percent O 2difference between the O 2monitor 
and the certified cylinder gas value for each gas. 13.0 Method Performance 
13.1. Calibration Drift Performance 
Specification. For O
2, same as specified in PS 
3. For CO, the same as specified in PS 4A 
except that the CEMS calibration must not drift from the reference value of the calibration standard by more than 3 percent of the span value on either the high or low range. 
13.2. Calibration Error (CE) Performance 
Specification. The mean difference between the CEMS and reference values at all three test points (see table 4B–1 of this method) must be no greater than 5 percent of span value for CO monitors and 0.5 percent for O
2 
monitors. 
13.3. Response Time Performance 
Specification. The response time for the CO or O
2monitor must not exceed 240 seconds. 
13.4. Relative Accuracy (RA) Performance 
Specification. For O 2, same as specified in PS 
3. For CO, the same as specified in PS 4A. 
14.0 Pollution Prevention [Reserved] 15.0 Waste Management [Reserved] 16.0 Alternative Procedure 
Alternative RA Procedure. Under some 
operating conditions, it may not be possible 
to obtain meaningful results using the RA test procedure. This includes conditions where consistent, very low CO emission or low CO emissions interrupted periodically by short duration, high level spikes are observed. It may be appropriate in these circumstances to waive the RA test and substitute the following procedure. 
Conduct a complete CEMS status check 
following the manufacturer’s written instructions. The check should include operation of the light source, signal receiver, timing mechanism functions, data acquisition and data reduction functions, data recorders, mechanically operated functions, sample filters, sample line heaters, moisture traps, and other related functions of the CEMS, as applicable. All parts of the CEMS must be functioning properly before the RA requirement can be waived. The instrument must also successfully pass the CE and CD specifications. Substitution of the alternate procedure requires approval of the Regional Administrator. 
17.0 Reference 
1. 40 CFR part 266, appendix IX, section 
2, ‘‘Performance Specifications for 
Continuous Emission Monitoring Systems.’’ 
18.0 Tables, Diagrams, Flowcharts, and 
Validation Data 
TABLE 4B–1—C ALIBRATION ERROR CONCENTRATION RANGE  
Measurement point CO low range 
(ppm) CO high range 
(ppm) O2 
(%) 
1 .............................................................................................................................. ...................................................... 0–40 0–600 0–2 
2 .............................................................................................................................. ...................................................... 60–80 900–1,200 8–10 
3 .............................................................................................................................. ...................................................... 140–160 2,100–2,400 14–16 
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FIGURE 4B–1—C ALIBRATION ERROR DATASHEET  
Run No. Calibration 
value Monitor 
response Difference 
Zero Mid High 
1—Zero.
2—Mid.
3—High.
4—Mid.
5—Zero.
6—High.
7—Zero.
8—Mid.
9—High.
Mean Difference = 
Calibration Error = % % % 
* * * * * 
Performance Specification 6—Specifications 
and Test Procedures for Continuous Emission Rate Monitoring Systems in Stationary Sources 
* * * * * 
13.0 Method Performance 
* * * * * 
13.2 CERMS Relative Accuracy. Calculate 
the CERMS Relative Accuracy (RA) 
expressed as a percentage using equation 2– 6 of section 12 of PS 2. The RA of the CERMS shall be no greater than 20.0 percent in terms of the units of the emission standard. If the average emissions for the test are less than 50 percent of the applicable emission standard, you may elect to substitute the applicable emission standard value in the denominator of equation 2–6 in place of the average RM value; in this case, the RA of the CERMS shall be no greater than 10.0 percent consistent with section 13.2 of PS 2. 
* * * * * 
Performance Specification 12A— 
Specifications and Test Procedures for Total Vapor Phase Mercury Continuous Emission Monitoring Systems in Stationary Sources 
* * * * * 
8.0 Performance Specification Test Procedure 
* * * * * 
8.4.2 Reference Methods (RM). Unless 
otherwise specified in an applicable subpart 
of this part, use method 29, method 30A, or method 30B in appendix A–8 to this part or ASTM Method D6784–16 (IBR, see § 60.17) as the RM for Hg concentration. For method 29 and ASTM Method D6784–16 only, the filterable portion of the sample need not be included when making comparisons to the CEMS results. When method 29, method 30B, or ASTM D6784–16 is used, conduct the RM test runs with paired or duplicate sampling systems and use the average of the vapor phase Hg concentrations measured by the two trains. When method 30A is used, paired sampling systems are not required. If the RM and CEMS measure on a different moisture basis, data derived with method 4 in appendix A–3 to this part must also be obtained during the RA test. 
* * * * * 
8.4.4 Number and Length of RM Test 
Runs. Conduct a minimum of nine RM test runs. When method 29, method 30B, or ASTM D6784–16 is used, only test runs for which the paired RM trains meet the relative deviation criteria (RD) of this PS must be used in the RA calculations. In addition, for method 29 and ASTM D6784–16, use a minimum sample time of 2 hours and for methods 30A and 30B use a minimum sample time of 30 minutes. 
Note: More than nine sets of RM test runs 
may be performed. If this option is chosen, RM test run results may be excluded so long as the total number of RM test run results used to determine the CEMS RA is greater than or equal to nine. However, all data must be reported including the excluded test run data. 
8.4.5 Correlation of RM and CEMS Data. 
Correlate the CEMS and the RM test data as to the time and duration by first determining from the CEMS final output (the one used for reporting) the integrated average pollutant concentration for each RM test period. Consider system response time, if important, and confirm that the results are on a consistent moisture basis with the RM test. Then, compare each integrated CEMS value against the corresponding RM value. When method 29, method 30B, or ASTM D6784–16 is used, compare each CEMS value against the corresponding average of the paired RM values. 
* * * * * 
8.4.6.1 When method 29, method 30B, or 
ASTM D6784–16 is used, outliers are identified through the determination of 
relative deviation (RD) of the paired RM tests. Data that do not meet the RD criteria must be flagged as a data quality problem and may not be used in the calculation of RA. The primary reason for performing paired RM sampling is to ensure the quality of the RM data. The percent RD of paired data is the parameter used to quantify data quality. Determine RD for paired data points as follows: 
Where C aand C bare the Hg concentration 
values determined from the paired samples. 
* * * * * 
13.0 Method Performance 
* * * * * 
13.3 Relative Accuracy (RA). The RA of 
the CEMS must be no greater than 20 percent of the mean value of the RM test data in terms of units of mg/scm. Alternatively, if the mean RM is less than 2.5 mg/scm, the results are acceptable if the absolute value of the difference between the mean RM and CEMS values added to the absolute value of the confidence coefficient from equation 12A–7 of this method does not exceed 0.5 mg/scm. 
* * * * * 
17.0 Bibliography 
* * * * * 
17.5 ASTM Method D6784–16, ‘‘Standard 
Test Method for Elemental, Oxidized, Particle-Bound and Total Mercury in Flue Gas Generated from Coal-Fired Stationary Sources (Ontario Hydro Method).’’ 
18.0 Tables and Figures 
* * * * * 
FIGURE 12A–3—R ELATIVE ACCURACY TESTDATA 
Run No. Date Begin time End time RM value 
(μg/m3) CEMS value 
(μg/m3) Difference 
(μg/m3) Run used? 
(yes/no) RD1 
1.
2.
3.
4.
5.
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FIGURE 12A–3—R ELATIVE ACCURACY TESTDATA—Continued 
Run No. Date Begin time End time RM value 
(μg/m3) CEMS value 
(μg/m3) Difference 
(μg/m3) Run used? 
(yes/no) RD1 
6.
7.
8.
9.
10.
11.
12 
Average Values 
Arithmetic Mean Difference: 
Standard Deviation: Confidence Coefficient: T-Value: % Relative Accuracy: | (RM)
avg¥ (CEMS) avg|: 
1Calculate the RD only if paired samples are taken using RM 30B, RM 29, or ASTM D6784–16. Express RD as a percentage or, for very low RM concentrations 
(≤1.0 μg/m3), as the absolute difference between C aand C b. 
* * * * * 
Performance Specification 16— 
Specifications and Test Procedures for Predictive Emission Monitoring Systems in Stationary Sources 
1.0 Scope and Application 
1.1 Does this performance specification 
apply to me? If you, the source owner or 
operator, intend to use (with any necessary approvals) a predictive emission monitoring system (PEMS) to show compliance with your emission limitation under this part or 40 CFR part 61 or 63, you must use the procedures in this performance specification (PS) to determine whether your PEMS is acceptable for use in demonstrating 
compliance with applicable requirements. Use these procedures to certify your PEMS after initial installation and periodically thereafter to ensure the PEMS is operating properly. If your PEMS contains a diluent (O
2 
or CO 2) measuring component, the diluent 
component must be tested as well. These specifications apply to PEMS that are installed under this part and 40 CFR parts 61 
and 63 after May 30, 2023. 
* * * * * 
3.0 Definitions 
* * * * * 
3.11 Relative Accuracy Audit (RAA) 
means a quarterly audit of the PEMS against a portable analyzer meeting the requirements 
of ASTM D6522–00 or a RM for a specified number of runs. A RM may be used in place of the portable analyzer for the RAA. 
3.12 Relative Accuracy Test Audit 
(RATA) means a RA test that is performed at 
least once every four calendar quarters after the initial certification test. The RATA shall be conducted as described in section 8.2 of this method. 
* * * * * 
9.0 Quality Control 
* * * * * 
9.1 QA/QC Summary. Conduct the 
applicable ongoing tests listed in this section. 
ONGOING QUALITY ASSURANCE TESTS  
Test PEMS 
regulatory 
purpose Acceptability Frequency 
Sensor Evaluation .......................................... All ............... .................................................. .......................... Daily. 
RAA ................................................................ All ............... Same as for RA in section 13.5 of this method Each quarter except quarter when RATA performed. 
RATA .............................................................. All ............... Same as for RA in section 13.1 of this method Yearly in quarter when RAA not performed. 
Bias Correction ............................................... All ............... If d avg≤ |cc| ........................................................ Bias test passed (no correction factor needed). 
PEMS Training ............................................... All ............... If F critical ≥ F, r ≥ 0.8 .......................................... Optional after initial and subsequent RATAs. 
Sensor Evaluation Alert Test (optional) ......... All ............... See section 6.1.8 of this method ....................... After each PEMS training. 
* * * * * 
13.0 Method Performance 
13.1 PEMS Relative Accuracy. The RA, 
calculated in units of the emission standard, 
must not exceed 10 percent if the PEMS measurements are greater than 100 ppm or 0.2 lbs/mm Btu. The RA must not exceed 20 percent if the PEMS measurements are between 100 ppm (or 0.2 lb/mm Btu) and 10 ppm (or 0.02 lb/mm Btu). For measurements below 10 ppm (or 0.02 lb/mm Btu), the absolute mean difference between the PEMS measurements and the RM measurements 
must not exceed 2 ppm (or 0.01 lb/mm Btu). For diluent only PEMS, an alternative criterion of ±1 percent absolute difference between the PEMS and RM may be used if less stringent. 
* * * * * 
13.5 Relative Accuracy Audits (RAA). 
The average of the three portable analyzer or RM determinations must not differ from the 
simultaneous PEMS average value by more than 10 percent of the analyzer or RM for concentrations greater than 100 ppm (or 0.2 lb/mm Btu) or 20 percent for concentrations between 100 ppm (or 0.2 lb/mm Btu) and 10 ppm (or 0.02 lb/mm Btu), or the test is failed. For measurements at 20 ppm (or 0.04 lb/mm Btu) or less, this difference must not exceed 2 ppm (or 0.01 lb/mm Btu) for a pollutant PEMS. For diluent PEMS, the difference must not exceed 1 percent. 
* * * * * 
■16. Amend appendix F to part 60 by: 
■a. Revising sections 4.1, 5.2.3, and 6.2 
in procedure 1; and 
■b. In procedure 5: 
■i. Revising section 2.5; 
■ii. Revising the heading for section 4.0 
and adding section 4.4; and 
■iii. Revising section 5.1.3. The revisions and addition read as 
follows: 
Appendix F to Part 60—Quality 
Assurance Procedures 
Procedure 1. Quality Assurance 
Requirements for Gas Continuous Emission Monitoring Systems Used for Compliance Determination 
* * * * * 
4. CD Assessment 
4.1 CD Requirement. As described in 
§ 60.13(d), source owners and operators of 
CEMS must check, record, and quantify the CD at two concentration values at least once daily (approximately 24 hours) in accordance with the method prescribed by the manufacturer. When using reference gases, introduce the reference gas prior to any sample conditioning or filtration equipment 
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and ensure that it passes through all filters, 
scrubbers, conditioners, and other monitor components used during normal sampling. The reference gas must pass through as much of the sampling probe as practical. The CEMS 
calibration must, at a minimum, be adjusted whenever the daily zero (or low-level) CD or the daily high-level CD exceeds two times the limits of the applicable PS’s in appendix B to this part. 
* * * * * 
5. Data Accuracy Assessment 
* * * * * 
5.2.3 Criteria for Excessive Audit 
Inaccuracy. Unless specified otherwise in the applicable subpart of this part, the criteria for excessive inaccuracy are: 
(1) For the RATA, the allowable RA in the 
applicable PS in appendix B to this part. 
(2) For the CGA, for pollutant monitors, the 
audit inaccuracy must be ±15 percent of the average audit value as calculated using equation 1–1 of this method or the difference between the average CEMS response and the average audit value must be less than one of the following: 
Analyzer span Alternative 
CGA criteria 
(ppm) 
≥50 ppm .............................. ±5 
>20 ppm, but ≤50 ppm ....... ±3 
≤20 ppm .............................. +2 
For diluent monitors, ±15 percent of the 
average audit value. 
(3) For the RAA, ±15 percent of the three- 
run average or ±7.5 percent of the applicable standard, whichever is greater. 
* * * * * 
6. Calculations for CEMS Data Accuracy 
* * * * * 
6.2 RAA Accuracy Calculation. Use 
equation 1–1 of this method to calculate the accuracy for the RAA. The RAA must be calculated in the units of the applicable emission standard. 
* * * * * 
Procedure 5. Quality Assurance 
Requirements for Vapor Phase Mercury Continuous Emissions Monitoring Systems and Sorbent Trap Monitoring Systems Used for Compliance Determination at Stationary Sources 
* * * * * 
2.0 Definitions 
* * * * * 
2.5 Calibration Drift (CD) means the 
absolute value of the difference between the 
CEMS output response and either the upscale elemental Hg reference gas or the zero-level elemental Hg reference gas, expressed as a percentage of the span value, when the entire CEMS, including the sampling interface, is challenged after a stated period of operation during which no unscheduled maintenance, repair, or adjustment took place. 
* * * * * 4.0 Calibration Drift (CD) Assessment and 
Weekly System Integrity Check 
* * * * * 
4.4 Weekly System Integrity Check. At 
least once every 7 operating days, using the procedure described in section 8.3.3 of Performance Specification 12A in appendix B to this part, source owners and operators of Hg CEMS must use a single mid- or high- level oxidized Hg (mercuric chloride, HgCl
2) 
reference gas to assess transport and measurement of oxidized mercury. The absolute value of the difference between the Hg CEMS output response and the reference gas must be less than or equal to 10.0 percent of the reference gas value or 0.8 mg/scm. 
* * * * * 
5.0 Data Accuracy Assessment 
* * * * * 
5.1.3 Relative Accuracy Audit (RAA). As 
an alternative to the QGA, a RAA may be conducted in three of four calendar quarters, but in no more than three quarters in succession. To conduct a RAA, follow the RATA test procedures in section 8.5 of PS 12A in appendix B to this part, except that only three test runs are required. Calculate the relative accuracy according to equation 1–1 of Procedure 1 of this appendix. 
* * * * * 
PART 63—NATIONAL EMISSION 
STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES 
■17. The authority citation for part 63 
continues to read as follows: 
Authority: 42 U.S.C. 7401 et seq. 
Subpart A—General Provisions 
■18. Amend § 63.14 by: 
■a. Redesignating paragraphs (d) 
through (t) as paragraphs (e) through (u); 
■b. Adding new paragraph (d); and 
■c. Revising newly redesignated 
paragraphs (i)(103) and (104). 
The addition and revisions read as 
follows: 
§ 63.14 Incorporations by reference. 
* * * * * 
(d) American Public Health 
Association, 1015 18th Street NW, Washington, DC 20036; phone (844) 232–3707; email: standardmethods@subscritpionoffice.com; website: www.standardmethods.org. 
(1) Standard Method 5210, 
Biochemical Oxygen Demand (BOD), revised December 10, 2019; IBR approved for § 63.457(c) 
(2) [Reserved] 
* * * * * 
(i) * * * (103) ASTM D6784–02 (Reapproved 
2008), Standard Test Method for Elemental, Oxidized, Particle-Bound and Total Mercury in Flue Gas Generated from Coal-Fired Stationary 
Sources (Ontario Hydro Method), Approved April 1, 2008; IBR approved for §§ 63.2465(d); 63.11646(a); 63.11647(a) and (d); tables 1, 2, 5, 11, 12t, and 13 to subpart DDDDD; tables 4 and 5 to subpart JJJJJ; tables 4 and 6 to subpart KKKKK; table 4 to subpart JJJJJJ. 
(104) ASTM D6784–16, Standard 
Test Method for Elemental, Oxidized, 
Particle-Bound and Total Mercury in Flue Gas Generated from Coal-Fired Stationary Sources (Ontario Hydro Method), Approved March 1, 2016; IBR approved for table 5 to subpart UUUUU; appendix A to subpart UUUUU. 
* * * * * 
Subpart S—National Emission 
Standards for Hazardous Air Pollutants from the Pulp and Paper Industry 
■19. Amend § 63.457 by revising 
paragraph (c)(4) to read as follows: 
§ 63.457 Test methods and procedures. 
* * * * * 
(c) * * * 
(4) To determine soluble BOD 5in the 
effluent stream from an open biological 
treatment unit used to comply with §§ 63.446(e)(2) and 63.453(j), the owner or operator shall use section B of method 5210 (IBR, see § 63.14) with the following modifications: 
(i) Filter the sample through the filter 
paper, into an Erlenmeyer flask by applying a vacuum to the flask sidearm. Minimize the time for which vacuum is applied to prevent stripping of volatile organics from the sample. Replace filter paper as often as needed in order to maintain filter times of less than approximately 30 seconds per filter paper. No rinsing of sample container or filter bowl into the Erlenmeyer flask is allowed. 
(ii) Perform method 5210B on the 
filtrate obtained in paragraph (c)(4) of this section. Dilution water shall be seeded with 1 milliliter of final effluent per liter of dilution water. Dilution ratios may require adjustment to reflect the lower oxygen demand of the filtered sample in comparison to the total BOD
5. 
Three BOD bottles and different dilutions shall be used for each sample. 
* * * * * 
Subpart EEE—National Emission 
Standards for Hazardous Air Pollutants from Hazardous Waste Combustors 
■20. Amend the appendix to subpart 
EEE of part 63 by revising the appendix heading and section 5 to read as follows: 
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Appendix A to Subpart EEE of Part 
63—Quality Assurance Procedures for Continuous Emissions Monitors Used for Hazardous Waste Combustors 
* * * * * 
5. Performance Evaluation for CO, O 2, and 
HC CEMS 
Carbon Monoxide (CO), Oxygen (O 2), and 
Hydrocarbon (HC) CEMS. An Absolute 
Calibration Audit (ACA) must be conducted quarterly, and a Relative Accuracy Test Audit (RATA) (if applicable, see sections 5.1 and 5.2 of this method) must be conducted yearly. When a performance test is also required under § 63.1207 to document compliance with emission standards, the RATA must coincide with the performance test. The audits must be conducted as follows. 
5.1 Relative Accuracy Test Audit (RATA). 
This requirement applies to O
2and CO 
CEMS. The RATA must be conducted at least yearly. Conduct the RATA as described in the RA test procedure (or alternate procedures section) described in the applicable performance specifications. In addition, analyze the appropriate performance audit samples received from the EPA as described in the applicable sampling methods. 
5.2 Absolute Calibration Audit (ACA). 
The ACA must be conducted at least quarterly except in a quarter when a RATA (if applicable, see section 5.1 of this method) 
is conducted instead. Conduct an ACA as described in the calibration error (CE) test procedure described in the applicable performance specifications. 
5.3 Excessive Audit Inaccuracy. If the RA 
from the RATA or the CE from the ACA exceeds the criteria in the applicable performance specifications, hazardous waste burning must cease immediately. Hazardous waste burning cannot resume until the owner or operator takes corrective measures and audit the CEMS with a RATA to document that the CEMS is operating within the specifications. 
* * * * * 
Subpart JJJJ—National Emission 
Standards for Hazardous Air Pollutants: Paper and Other Web Coating 
■21. Amend § 63.3360 by revising 
paragraph (e)(1)(vi) introductory text to read as follows: 
§ 63.3360 What performance tests must I 
conduct? 
* * * * * 
(e) * * * 
(1) * * * (vi) Method 25 or 25A of appendix A– 
7 to 40 CFR part 60 must be used to determine total gaseous organic matter 
concentration. Use the same test method for both the inlet and outlet measurements which must be conducted simultaneously. You must submit notice of the intended test method to the Administrator for approval along with notification of the performance test required under § 63.7(b). You must use method 25A if any of the conditions described in paragraphs (e)(1)(vi)(A) through (D) of this section apply to the control device. 
* * * * * 
Subpart ZZZZ—National Emissions 
Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines 
■22. Revise table 4 to subpart ZZZZ of 
part 63 to read as follows: 
Table 4 to Subpart ZZZZ of Part 63— 
Requirements for Performance Tests 
As stated in §§ 63.6610, 63.6611, 
63.6620, and 63.6640, you must comply with the following requirements for performance tests for stationary RICE: 
For each . . . Complying with the 
requirement to . . . You must . . . Using . . . According to the following requirements . . . 
1. 2SLB, 4SLB, and 
CI stationary RICE.a. Reduce CO emis-
sions.i. Select the sampling port loca-
tion and the number/location of 
traverse points at the inlet and outlet of the control device; and ...................................................... (a) For CO, O
2, and moisture measurement, 
ducts ≤6 inches in diameter may be sam-
pled at a single point located at the duct centroid and ducts >6 and ≤12 inches in diameter may be sampled at 3 traverse points located at 16.7, 50.0, and 83.3% of the measurement line (’3-point long line’). If the duct is >12 inches in diameter and the sampling port location meets the two and half-diameter criterion of section 11.1.1 of method 1 of 40 CFR part 60, ap-pendix A–1, the duct may be sampled at ‘3-point long line’; otherwise, conduct the stratification testing and select sampling points according to section 8.1.2 of meth-od 7E of 40 CFR part 60, appendix A–4. 
ii. Measure the O 2at the inlet 
and outlet of the control de-vice; and (1) Method 3 or 3A or 3B of 40 
CFR part 60, appendix A–2, or ASTM D6522–00 (Reapproved 2005)
13(heated probe not 
necessary).(b) Measurements to determine O 2must be 
made at the same time as the measure-ments for CO concentration. 
iii. Measure the CO at the inlet 
and the outlet of the control device; and (2) ASTM D6522–00 (Re-
approved 2005)
123(heated 
probe not necessary) or meth-od 10 of 40 CFR part 60, ap-pendix A–4.(c) The CO concentration must be at 15 per-
cent O
2, dry basis. 
iv. Measure moisture content at 
the inlet and outlet of the con-trol device as needed to deter-mine CO and O
2concentra-
tions on a dry basis.(3) Method 4 of 40 CFR part 60, 
appendix A–3, or method 320 of 40 CFR part 63, appendix A, or ASTM D6348–03
13.(d) Measurements to determine moisture 
content must be made at the same time and location as the measurements for CO concentration. 
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For each . . . Complying with the 
requirement to . . . You must . . . Using . . . According to the following requirements . . . 
2. 4SRB stationary 
RICE.a. Reduce formalde-
hyde or THC emis-
sions.i. Select the sampling port loca-
tion and the number/location of traverse points at the inlet and outlet of the control device; and ...................................................... (a) For formaldehyde, THC, O
2, and mois-
ture measurement, ducts ≤6 inches in di-ameter may be sampled at a single point located at the duct centroid and ducts >6 and ≤12 inches in diameter may be sam-
pled at 3 traverse points located at 16.7, 50.0, and 83.3% of the measurement line (‘3-point long line’). If the duct is >12 inches in diameter and the sampling port 
location meets the two and half-diameter criterion of section 11.1.1 of method 1 of 40 CFR part 60, appendix A, the duct may be sampled at ‘3-point long line’; oth-erwise, conduct the stratification testing and select sampling points according to section 8.1.2 of method 7E of 40 CFR part 60, appendix A. 
ii. Measure O 2at the inlet and 
outlet of the control device; and (1) Method 3 or 3A or 3B of 40 
CFR part 60, appendix A–2, or ASTM D6522–00 (Reapproved 2005)
13(heated probe not 
necessary).(b) Measurements to determine O 2con-
centration must be made at the same time as the measurements for formaldehyde or THC concentration. 
iii. Measure moisture content at 
the inlet and outlet of the con-trol device as needed to deter-mine formaldehyde or THC and O
2concentrations on a 
dry basis; and (2) Method 4 of 40 CFR part 60, 
appendix A–3, or method 320 of 40 CFR part 63, appendix A, or ASTM D6348–03
13.(c) Measurements to determine moisture 
content must be made at the same time and location as the measurements for formaldehyde or THC concentration. 
iv. If demonstrating compliance 
with the formaldehyde percent reduction requirement, meas-ure formaldehyde at the inlet and the outlet of the control device.(3) Method 320 or 323 of 40 
CFR part 63, appendix A; or ASTM D6348–03,
13provided 
in ASTM D6348–03 Annex A5 (Analyte Spiking Technique), the percent R must be greater than or equal to 70 and less than or equal to 130.(d) Formaldehyde concentration must be at 
15 percent O
2, dry basis. Results of this 
test consist of the average of the three 1- hour or longer runs. 
v. If demonstrating compliance 
with the THC percent reduction requirement, measure THC at the inlet and the outlet of the control device.(4) (1) Method 25A, reported as 
propane, of 40 CFR part 60, appendix A–7.(e) THC concentration must be at 15 per-
cent O
2, dry basis. Results of this test 
consist of the average of the three 1-hour or longer runs. 
3. Stationary RICE .... a. Limit the concentra-
tion of formalde-hyde or CO in the stationary RICE ex-haust.i. Select the sampling port loca-
tion and the number/location of traverse points at the exhaust of the stationary RICE; and ...................................................... (a) For formaldehyde, CO, O
2, and moisture 
measurement, ducts ≤6 inches in diame-ter may be sampled at a single point lo-cated at the duct centroid and ducts >6 and ≤12 inches in diameter may be sam-
pled at 3 traverse points located at 16.7, 50.0, and 83.3% of the measurement line (‘3-point long line’). If the duct is >12 inches in diameter and the sampling port 
location meets the two and half-diameter criterion of section 11.1.1 of method 1 of 40 CFR part 60, appendix A, the duct may be sampled at ‘3-point long line’; oth-erwise, conduct the stratification testing and select sampling points according to section 8.1.2 of method 7E of 40 CFR part 60, appendix A. If using a control de-vice, the sampling site must be located at the outlet of the control device. 
ii. Determine the O 2concentra-
tion of the stationary RICE ex-haust at the sampling port lo-cation; and (1) Method 3 or 3A or 3B of 40 
CFR part 60, appendix A–2, or ASTM D6522–00 (Reapproved 2005)
13(heated probe not 
necessary).(b) Measurements to determine O 2con-
centration must be made at the same time and location as the measurements for formaldehyde or CO concentration. 
iii. Measure moisture content of 
the stationary RICE exhaust at the sampling port location as needed to determine formalde-hyde or CO and O
2concentra-
tions on a dry basis; and (2) Method 4 of 40 CFR part 60, 
appendix A–3, or method 320 of 40 CFR part 63, appendix A, or ASTM D6348–03
13.(c) Measurements to determine moisture 
content must be made at the same time and location as the measurements for formaldehyde or CO concentration. 
iv. Measure formaldehyde at the 
exhaust of the stationary RICE; or (3) Method 320 or 323 of 40 
CFR part 63, appendix A; or ASTM D6348–03,
13provided 
in ASTM D6348–03 Annex A5 (Analyte Spiking Technique), the percent R must be greater than or equal to 70 and less than or equal to 130.(d) Formaldehyde concentration must be at 
15 percent O
2, dry basis. Results of this 
test consist of the average of the three 1- hour or longer runs. 
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For each . . . Complying with the 
requirement to . . . You must . . . Using . . . According to the following requirements . . . 
v. Measure CO at the exhaust of 
the stationary RICE.(4) Method 10 of 40 CFR part 
60, appendix A–4, ASTM 
D6522–00 (2005),13method 
320 of 40 CFR part 63, appen-dix A, or ASTM D6348–03
13.(e) CO concentration must be at 15 percent 
O2, dry basis. Results of this test consist 
of the average of the three 1-hour or longer runs. 
1You may also use methods 3A and 10 as options to ASTM–D6522–00 (2005). 
2You may obtain a copy of ASTM–D6348–03 from at least one of the following addresses: American Society for Testing and Materials, 100 Barr Harbor Drive, 
West Conshohocken, PA 19428–2959, or University Microfilms International, 300 North Zeeb Road, Ann Arbor, MI 48106. 
3Incorporated by reference, see § 63.14. 
Subpart PPPPP—National Emission 
Standards for Hazardous Air Pollutants for Engine Test Cells/Stands 
■23. Amend § 63.9306 by revising 
paragraph (d)(2)(iv) to read as follows: 
§ 63.9306 What are my continuous 
parameter monitoring system (CPMS) installation, operation, and maintenance requirements? 
* * * * * 
(d) * * * 
(2) * * * (iv) Using a pressure sensor with 
measurement sensitivity of 0.002 inch water, check gauge calibration quarterly 
and transducer calibration monthly. 
* * * * * 
■24. Amend § 63.9322 by revising 
paragraph (a)(1) to read as follows: 
§ 63.9322 How do I determine the emission 
capture system efficiency? 
* * * * * 
(a) * * * 
(1) The capture system meets the 
criteria in method 204 of appendix M to 
40 CFR part 51 for a permanent total 
enclosure (PE) and directs all the exhaust gases from the enclosure to an add-on control device. 
* * * * * Subpart UUUUU—National Emission 
Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units 
■25. Revise table 5 to subpart UUUUU 
of part 63 to read as follows: 
Table 5 to Subpart UUUUU of Part 63— 
Performance Testing Requirements 
As stated in § 63.10007, you must 
comply with the following requirements 
for performance testing for existing, new or reconstructed affected sources:
1 
BILLING CODE 6560–50–P 
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1Regarding emissions data collected 
during periods of startup or shutdown, see 
§§ 63.10020(b) and (c) and 63.10021(h). 
2See tables 1 and 2 to this subpart for 
required sample volumes and/or sampling run times. 
3Incorporated by reference, see § 63.14. 
■26. Amend appendix A to subpart 
UUUUU of part 63 by revising sections 
4.1.1.5 and 4.1.1.4.1 to read as follows: 
Appendix A to Subpart UUUUU of Part 
63—Hg Monitoring Provisions 
* * * * * 
4. Certification and Recertification 
Requirements 
* * * * * 
4.1.1.5 Relative Accuracy Test Audit 
(RATA). Perform the RATA of the Hg CEMS 
at normal load. Acceptable Hg reference 
methods for the RATA include ASTM D6784–16 (IBR, see § 63.14) and methods 29, 30A, and 30B in appendix A–8 to part 60 of this chapter. When method 29 or ASTM D6784–16 is used, paired sampling trains are required, and the filterable portion of the sample need not be included when making comparisons to the Hg CEMS results for purposes of a RATA. To validate a method 29 or ASTM D6784–16 test run, calculate the relative deviation (RD) using equation A–1 of this section, and assess the results as follows to validate the run. The RD must not exceed 10 percent, when the average Hg concentration is greater than 1.0 mg/dscm. If the RD specification is met, the results of the two samples shall be averaged arithmetically. 
Where: 
RD = Relative Deviation between the Hg 
concentrations of samples ‘‘a’’ and ‘‘b’’ 
(percent), 
Ca= Hg concentration of Hg sample ‘‘a’’ (mg/ 
dscm), and 
Cb= Hg concentration of Hg sample ‘‘b’’ (mg/ 
dscm). 
4.1.1.5.1 Special Considerations. A 
minimum of nine valid test runs must be performed, directly comparing the CEMS measurements to the reference method. More than nine test runs may be performed. If this option is chosen, the results from a maximum of three test runs may be rejected 
so long as the total number of test results used to determine the relative accuracy is greater than or equal to nine; however, all data must be reported including the rejected data. The minimum time per run is 21 minutes if method 30A is used. If method 29, method 30B, or ASTM D6784–16 is used, the time per run must be long enough to collect a sufficient mass of Hg to analyze. Complete the RATA within 168 unit operating hours, except when method 29 or ASTM D6784–162 is used, in which case, up to 336 operating hours may be taken to finish the test. 
* * * * * 
■27. Amend appendix A to part 63 by: 
■a. Redesignating section 6.2 under the 
heading ‘‘16.0 Alternative Procedures’’ 
as section 16.2 in method 315; and 
■b. In method 323: 
■i. Revising sections 10.1 and 10.3; 
■ii. In section 12.1: 
■A. Adding the entry ‘‘b’’ following the 
entry ‘‘B = estimated sampling rate, Lpm’’; and 
■B. Revising the entry ‘‘K c’’; and 
■iii. Revising section 12.6. 
The revisions and addition read as 
follows: 
Appendix A to Part 63—Test Methods 
* * * * * 
Method 323—Measurement of 
Formaldehyde Emissions From Natural Gas- Fired Stationary Sources—Acetyl Acetone Derivatization Method 
* * * * * 
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10.0 Calibration and Standardization 
10.1 Spectrophotometer Calibration. 
Prepare a stock solution of 10 mg/mL 
formaldehyde. Prepare a series of calibration standards from the stock solution 
corresponding to 0.0, 0.5, 1.5, 3.5, 5.0, and 7.5 mg/mL formaldehyde. Mix 2.0 ml of each 
calibration standard with 2.0 mL of acetyl acetone reagent in screw cap vials, thoroughly mix the solution, and place the vials in a water bath (or heating block) at 60 °C for 10 minutes. Remove the vials and allow to cool to room temperature. Transfer each solution to a cuvette and measure the absorbance at 412 nm using the spectrophotometer. Develop a calibration curve (response vs. concentration) from the analytical results of these standards. The acceptance criteria for the spectrophotometer 
calibration is a correlation coefficient of 0.99 or higher. If this criterion is not met, the calibration procedures should be repeated. 
* * * * * 
10.3 Calibration Checks. Calibration 
checks consisting of analyzing a mid-range standard separately prepared with each batch of samples. The calibration check standard must be prepared independent of the calibration stock solution. The result of the check standard must be within 10 percent of the theoretical value to be acceptable. If the acceptance criteria are not met, the standard must be reanalyzed. If still unacceptable, a new calibration curve must be prepared using freshly prepared standards. 
* * * * * 12.0 Calculations and Data Analysis 
12.1 Nomenclature 
* * * * * 
b = the intercept of the calibration curve at 
zero concentration. 
* * * * * 
Kc= spectrophotometer calibration factor, 
slope of the least square regression line, 
absorbance/(mg/mL) (Note: Most 
spreadsheets are capable of calculating a least squares line, including slope, intercept, and correlation coefficient). 
* * * * * 
12.6 Mass of Formaldehyde in Liquid 
Sample 
* * * * * 
[FR Doc. 2023–04956 Filed 3–28–23; 8:45 am] 
BILLING CODE 6560–50–C 
ENVIRONMENTAL PROTECTION 
AGENCY 
40 CFR Part 52 
[EPA–R04–OAR–2021–0769; FRL–10576– 
02–R4] 
Air Plan Approval; NC; Transportation Conformity 
AGENCY : Environmental Protection 
Agency (EPA). 
ACTION : Final rule. 
SUMMARY : The Environmental Protection 
Agency (EPA) is approving State 
Implementation Plan (SIP) revisions submitted by the State of North Carolina, through the North Carolina Department of Environmental Quality (DEQ), Division of Air Quality (DAQ) on September 24, 2021. The SIP revisions replace previously approved memoranda of agreement (MOAs) with thirteen updated MOAs outlining transportation conformity criteria and procedures related to interagency consultation, conflict resolution, public participation, and enforceability of certain transportation-related control and mitigation measures. EPA is approving North Carolina’s September 24, 2021, SIP revisions as they are consistent with the applicable provisions of the Clean Air Act (CAA or Act). 
DATES : This rule is effective April 28, 
2023. 
ADDRESSES : EPA has established a 
docket for this action under Docket Identification EPA–R04–OAR–2021– 0769. All documents in the docket are listed on the regulations.gov website. 
Although listed in the index, some information may not be publicly available, i.e., Confidential Business 
Information or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the internet and will be publicly available only in hard copy form. Publicly available docket materials are available either electronically through www.regulations.gov or in hard copy at 
the Air Regulatory Management Section, Air Planning and Implementation Branch, Air and Radiation Division, U.S. Environmental Protection Agency, Region 4, 61 Forsyth Street SW, Atlanta, Georgia 30303–8960. EPA requests that, if possible, you contact the person listed in the 
FOR FURTHER INFORMATION  
CONTACT section to schedule your 
inspection. The Regional Office’s official hours of business are Monday through Friday 8:30 a.m. to 4:30 p.m., excluding Federal holidays. 
FOR FURTHER INFORMATION CONTACT : 
Kelly Sheckler, Air Regulatory Management Section, Air Planning and Implementation Branch, Air and Radiation Division, Region 4, U.S. Environmental Protection Agency, 61 Forsyth Street SW, Atlanta, Georgia 30303–8960. The telephone number is (404) 562–9222 Ms. Sheckler can also be reached via electronic mail at sheckler.kelly@epa.gov. 
SUPPLEMENTARY INFORMATION : 
I. Background 
As described in a notice of proposed 
rulemaking (NPRM) published on February 7, 2023 (88 FR 7903), CAA section 176(c)(4)(E) and 40 CFR 51.390(b) require states to develop conformity SIPs that address three specific provisions of federal regulations. First, EPA’s transportation conformity rule requires states to develop their own processes and procedures which meet the criteria in 40 CFR 93.105 for interagency consultation and resolution of conflicts among the federal, state, and local agencies. The SIP revision must include processes and procedures to be followed by the metropolitan planning organization (MPO), state Department of Transportation (DOT), and the United States Department of Transportation (USDOT) in consultation with the state and local air quality agencies and EPA before making conformity determinations. The conformity SIP revision must also include processes and procedures for the state and local air quality agencies and EPA to coordinate the development of applicable SIPs with MPOs, state DOTs and the USDOT. 
States may choose to develop, in 
place of regulations, an MOA which establishes the roles and procedures for transportation conformity. The MOA includes the detailed consultation procedures developed for that particular area. The MOAs are enforceable through the signature of all the transportation and air quality agencies, including the USDOT’s Federal Highway Administration, USDOT’s Federal Transit Administration, and EPA. 
North Carolina’s September 24, 2021, 
conformity SIP revisions add new interagency partners and MPOs, establish new procedures for interagency consultation, dispute resolution, public participation and enforceability of certain transportation- 
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