Document ID: EPA-HQ-OAR-2020-0556-0014
Agency: epa
Document Type: Rule
Title: Testing Provisions for Air Emission Sources
Posted Date: 2023-03-29T04:00Z

[Federal Register Volume 88, Number 60 (Wednesday, March 29, 2023)]
[Rules and Regulations]
[Pages 18396-18423]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-04956]

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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.

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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outdated procedures, and revisions to add clarity and consistency with 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: [email protected].

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

[[Page 18397]]

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, Sec.  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 Sec.  60.534(c) and developed new 
language to replace ASTM E2515-11, section 9.6.5.1 by adding Sec.  
60.534(c)(1), which specifies appropriate post-test leak check 
procedures and in Sec.  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 Sec.  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 Sec.  60.539b(b) is revised to include 
General Provisions that were added to Sec.  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

[[Page 18398]]

Sec.  60.8(f) in its entirety. The exemption promulgated in subpart AAA 
at Sec.  60.539b(b) was intended to exempt those affected sources from 
Sec.  60.8(f), which, at the time, consisted of what is now currently 
Sec.  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 Sec.  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 Sec.  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 Sec.  60.5476(c)(5) and 
(6) is removed and the paragraphs are reserved.
    We revised the language in Sec.  60.5476(f) and developed new 
language to replace ASTM E2515-11, section 9.6.5.1 by adding Sec.  
60.5476(f)(1), which specifies appropriate post-test leak check 
procedures and in Sec.  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 Sec.  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 Sec.  60.5476(f), we 
incorporated language about filter type and size acceptance currently 
in Sec.  60.5476(c)(5). Additionally, we removed language relating to 
EN 303-5 currently found in Sec.  60.5476(f).
    The regulatory language in Sec.  60.5483(b) is revised to include 
General Provisions that were added to Sec.  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 Sec.  60.8(f) in its 
entirety. The exemption promulgated in subpart QQQQ at Sec.  60.5483(b) 
was intended for those affected sources subject to Sec.  60.8(f), 
which, at the time, consisted of what is currently Sec.  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 Sec.  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 N2 or 5 percent 
O2.'' Also, the nomenclature in section 12.1 for 
CN2 and CmN2 is revised to provide clarity. More 
specifically, CN2 is changed from ``N2 
concentration in the diluted sample gas'' to ``N2 
concentration in the landfill gas sample,'' and the CmN2 is 
changed from ``Measured N2 concentration, fraction in 
landfill gas'' to ``Measured N2 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.

[[Page 18399]]

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 [micro]g/scm and (2) the difference between the average 
reference method and CEMS values added to the confidence coefficient is 
now 0.5 [micro]g/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

[[Page 18400]]

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 [micro]g/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, Sec.  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 Sec.  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 Sec.  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 Sec.  63.3360(e)(1)(vi) was overlooked. We are 
revising Sec.  63.3360(e)(1)(vi) by removing the term ``non-methane'' 
to be consistent with Sec.  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 O2 measurements 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 Sec.  
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 Sec.  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 Kc. 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

[[Page 18401]]

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

0
1. The authority citation for part 51 continues to read as follows:

    Authority: 23 U.S.C. 101; 42 U.S.C. 7401-7671q.

0
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

* * * * *

[[Page 18402]]

Method 201A--Determination of PM10 and PM2.5 Emissions From Stationary 
Sources (Constant Sampling Rate Procedure)

* * * * *

12.0 Calculations and Data Analysis

* * * * *
    12.5 * * *
    [GRAPHIC] [TIFF OMITTED] TR29MR23.000
    
* * * * *

PART 60--STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES

0
3. The authority citation of part 60 continues to read as follows:

    Authority:  42 U.S.C. 7401 et seq.

Subpart A--General Provisions

0
4. Amend Sec.  60.17 by:
0
a. Revising paragraphs (h)(182) and (195);
0
b. Redesignating paragraphs (h)(196) through (217) as paragraphs 
(h)(197) through (218) respectively; and
0
c. Adding new paragraph (h)(196).
    The revisions and addition read as follows:

Sec.  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 Sec.  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

0
5. Amend Sec.  60.534 by revising paragraphs (c) and (d) to read as 
follows:

Sec.  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 Sec.  60.532(a) 
through (c), particulate matter emission concentrations must be 
measured with ASTM E2515-11 (IBR, see Sec.  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 Sec.  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 
Sec.  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 Sec.  
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.
* * * * *

0
6. Amend Sec.  60.539b by revising paragraph (b) to read as follows:

Sec.  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

0
7. Amend Sec.  60.5474 by revising paragraphs (b)(2), (3), and (6) to 
read as follows:

 Sec.  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 Sec.  
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 Sec.  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 Sec.  
60.5476 or cord wood test methods approved by the Administrator.
* * * * *

0
8. Amend Sec.  60.5476 by:

[[Page 18403]]

0
a. Removing paragraphs (c)(5) and (6); and
0
b. Revising paragraph (f).
    The revision reads as follows:

Sec.  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 Sec.  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 Sec.  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 
Sec.  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.

* * * * *

0
9. Amend Sec.  60.5483 by revising paragraph (b) to read as follows:

Sec.  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);
* * * * *

0
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--Location of Traverse Points in Circular Stacks
                                             [Percent of stack diameter from inside wall to traverse point]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                              Number of traverse points on a diameter
   Traverse point number 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

[[Page 18404]]

 
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
--------------------------------------------------------------------------------------------------------------------------------------------------------

* * * * *

0
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
[GRAPHIC] [TIFF OMITTED] TR29MR23.001

[[Page 18405]]

* * * * *

0
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 Kc 
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 [mu]g NO2) shall be less than 7 percent for 
all standards.
* * * * *

0
13. Amend appendix A-7 to part 60 by:
0
a. Revising equation 19-5 in section 12.2.3.2 in method 19;
0
b. In method 25:
0
i. Adding sections 12.9 and 12.9.1 through 12.9.16; and
0
ii. Revising figure 25-6 under the heading ``17.0 Tables, Diagrams, 
Flowcharts, and Validation Data''; and
0
c. In method 25C:
0
i. Revising section 9.1; and
0
ii. Revising the entries ``CN2'' 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 * * *
    [GRAPHIC] [TIFF OMITTED] TR29MR23.002
    
* * * * *

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 O2 Blank 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

* * * * *

[[Page 18406]]

[GRAPHIC] [TIFF OMITTED] TR29MR23.003

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    Ensures that ambient
                         sample contains less than   air was not drawn
                         20 percent N2 or 5          into the landfill
                         percent O2. Landfills       gas sample and gas
                         with 3-year average         was sampled from an
                         annual rainfalls equal to   appropriate
                         or less than 20 inches      location.
                         annual rainfalls samples
                         are acceptable when the
                         N2 to O2 concentration
                         ratio is greater than
                         3.71.
10.1, 10.2              NMOC analyzer initial and   Ensures precision of
                         daily performance checks.   analytical results.
------------------------------------------------------------------------

* * * * *

12.0 Data Analysis and Calculations

* * * * *
    12.1 Nomenclature
* * * * *
    CN2 = N2 concentration in the landfill gas 
sample.
    CmN2 = Measured N2 concentration, diluted 
landfill gas sample.
* * * * *

0
14. Amend appendix A-8 to part 60 by:
0
a. Revising sections 12.4 and 12.5 in method 26.
0
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 [micro]g HCl, HBr, or HF Per Sample.
    [GRAPHIC] [TIFF OMITTED] TR29MR23.004
    

[[Page 18407]]

    12.5 Total [micro]g Cl2 or Br2 Per Sample.
    [GRAPHIC] [TIFF OMITTED] TR29MR23.005
    
* * * * *

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:
[GRAPHIC] [TIFF OMITTED] TR29MR23.006

    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, 
COT, shall be calculated as the sum of CO_1, 
CO_2, CO_3 and CO_4.
* * * * *

0
15. Amend appendix B to part 60 by:
0
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;
0
b. Revising sections 8.3.3 and 12.5 in performance specification 2;
0
c. Revising performance specification 4B;
0
d. Revising section 13.2 in performance specification 6;
0
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
0
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 Sec.  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.
* * * * *

[[Page 18408]]

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:
[GRAPHIC] [TIFF OMITTED] TR29MR23.007

Where:

OP1 = Nominal opacity value of required low-, mid-, or 
high-range calibration attenuators.
OP2 = Desired attenuator opacity value from ASTM D6216-
20, section 7.5 at the opacity limit required by the applicable 
subpart of this part.
L1 = 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 SO2 
and NOX 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:
[GRAPHIC] [TIFF OMITTED] TR29MR23.008

Where:

[verbar]d[verbar] = Absolute value of the mean differences (from 
equation 2-3 of this method).
[verbar]CC[verbar] = 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 (O2).............................................       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 (O2) 
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 O2) 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 O2, same as specified in 
PS 3, except that the span must be 25 percent. The span of the 
O2 may be higher if the O2 concentration 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.

[[Page 18409]]

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 
O2 monitors 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 O2 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 O2) 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 O2 monitors.
    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:
[GRAPHIC] [TIFF OMITTED] TR29MR23.009

Where:

d = mean difference between the CEMS response and the known 
reference concentration, and
FS = span value.

    The CE for the O2 monitor is the average percent 
O2 difference between the O2 monitor and the 
certified cylinder gas value for each gas.

13.0 Method Performance

    13.1. Calibration Drift Performance Specification. For 
O2, 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 
O2 monitors.
    13.3. Response Time Performance Specification. The response time 
for the CO or O2 monitor must not exceed 240 seconds.
    13.4. Relative Accuracy (RA) Performance Specification. For 
O2, 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--Calibration Error Concentration Range
----------------------------------------------------------------------------------------------------------------
                                                                   CO low range    CO high range
                        Measurement point                              (ppm)           (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
----------------------------------------------------------------------------------------------------------------

[[Page 18410]]

                                    Figure 4B-1--Calibration Error Data Sheet
----------------------------------------------------------------------------------------------------------------
                                                                                    Difference
             Run No.                Calibration       Monitor    -----------------------------------------------
                                       value         response          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 Sec.  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:
[GRAPHIC] [TIFF OMITTED] TR29MR23.010

Where Ca and Cb are 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 [micro]g/scm. Alternatively, if the mean RM is 
less than 2.5 [micro]g/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 [micro]g/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--Relative Accuracy Test Data
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                           RM value    CEMS value   Difference
                     Run No.                          Date      Begin time    End time     ([mu]g/      ([mu]g/      ([mu]g/     Run used?      RD \1\
                                                                                            m\3\)        m\3\)        m\3\)       (yes/no)
--------------------------------------------------------------------------------------------------------------------------------------------------------
1...............................................
2...............................................
3...............................................
4...............................................
5...............................................

[[Page 18411]]

 
6...............................................
7...............................................
8...............................................
9...............................................
10..............................................
11..............................................
12
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                     Average Values
--------------------------------------------------------------------------------------------------------------------------------------------------------
Arithmetic Mean Difference:
Standard Deviation:
Confidence Coefficient:
T-Value:
% Relative Accuracy:
[verbar] (RM)avg - (CEMS)avg[verbar]:
--------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ Calculate 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 [micro]g/m\3\), as the absolute difference between Ca and Cb.

* * * * *

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 (O2 or CO2) 
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
----------------------------------------------------------------------------------------------------------------
                                         PEMS  regulatory
                Test                         purpose               Acceptability               Frequency
----------------------------------------------------------------------------------------------------------------
Sensor Evaluation...................  All..................  ........................  Daily.
RAA.................................  All..................  Same as for RA in         Each quarter except
                                                              section 13.5 of this      quarter when RATA
                                                              method.                   performed.
RATA................................  All..................  Same as for RA in         Yearly in quarter when
                                                              section 13.1 of this      RAA not performed.
                                                              method.
Bias Correction.....................  All..................  If davg <=                Bias test passed (no
                                                              [verbar]cc[verbar].       correction factor
                                                                                        needed).
PEMS Training.......................  All..................  If Fcritical >= F, r >=   Optional after initial
                                                              0.8.                      and subsequent RATAs.
Sensor Evaluation Alert Test          All..................  See section 6.1.8 of      After each PEMS training.
 (optional).                                                  this method.
----------------------------------------------------------------------------------------------------------------

* * * * *

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.
* * * * *

0
16. Amend appendix F to part 60 by:
0
a. Revising sections 4.1, 5.2.3, and 6.2 in procedure 1; and
0
b. In procedure 5:
0
i. Revising section 2.5;
0
ii. Revising the heading for section 4.0 and adding section 4.4; and
0
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 Sec.  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

[[Page 18412]]

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:

------------------------------------------------------------------------
                                                           Alternative
                     Analyzer span                         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, HgCl2) 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 [micro]g/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

0
17. The authority citation for part 63 continues to read as follows:

    Authority: 42 U.S.C. 7401 et seq.

Subpart A--General Provisions

0
18. Amend Sec.  63.14 by:
0
a. Redesignating paragraphs (d) through (t) as paragraphs (e) through 
(u);
0
b. Adding new paragraph (d); and
0
c. Revising newly redesignated paragraphs (i)(103) and (104).
    The addition and revisions read as follows:

Sec.  63.14  Incorporations by reference.

* * * * *
    (d) American Public Health Association, 1015 18th Street NW, 
Washington, DC 20036; phone (844) 232-3707; email: 
[email protected]; website: 
www.standardmethods.org.
    (1) Standard Method 5210, Biochemical Oxygen Demand (BOD), revised 
December 10, 2019; IBR approved for Sec.  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 Sec. Sec.  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

0
19. Amend Sec.  63.457 by revising paragraph (c)(4) to read as follows:

Sec.  63.457  Test methods and procedures.

* * * * *
    (c) * * *
    (4) To determine soluble BOD5 in the effluent stream 
from an open biological treatment unit used to comply with Sec. Sec.  
63.446(e)(2) and 63.453(j), the owner or operator shall use section B 
of method 5210 (IBR, see Sec.  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 BOD5. 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

0
20. Amend the appendix to subpart EEE of part 63 by revising the 
appendix heading and section 5 to read as follows:

[[Page 18413]]

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, O2, and HC CEMS

    Carbon Monoxide (CO), Oxygen (O2), 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 Sec.  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 O2 and 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

0
21. Amend Sec.  63.3360 by revising paragraph (e)(1)(vi) introductory 
text to read as follows:

Sec.  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 Sec.  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

0
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 Sec. Sec.  63.6610, 63.6611, 63.6620, and 63.6640, you 
must comply with the following requirements for performance tests for 
stationary RICE:

----------------------------------------------------------------------------------------------------------------
                                   Complying with                                            According to the
         For each . . .           the requirement     You must . . .      Using . . .     following requirements
                                      to . . .                                                     . . .
----------------------------------------------------------------------------------------------------------------
1. 2SLB, 4SLB, and CI            a. Reduce CO       i. Select the      .................  (a) For CO, O2, and
 stationary RICE.                 emissions.         sampling port                         moisture measurement,
                                                     location and the                      ducts <=6 inches in
                                                     number/location                       diameter may be
                                                     of traverse                           sampled at a single
                                                     points at the                         point located at the
                                                     inlet and outlet                      duct centroid and
                                                     of the control                        ducts >6 and <=12
                                                     device; and                           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,
                                                                                           appendix 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 method 7E of
                                                                                           40 CFR part 60,
                                                                                           appendix A-4.
                                                    ii. Measure the    (1) Method 3 or    (b) Measurements to
                                                     O2 at the inlet    3A or 3B of 40     determine O2 must be
                                                     and outlet of      CFR part 60,       made at the same time
                                                     the control        appendix A-2, or   as the measurements
                                                     device; and        ASTM D6522-00      for CO concentration.
                                                                        (Reapproved
                                                                        2005) \1\ \3\
                                                                        (heated probe
                                                                        not necessary).
                                                    iii. Measure the   (2) ASTM D6522-00  (c) The CO
                                                     CO at the inlet    (Reapproved        concentration must be
                                                     and the outlet     2005) \1\ \2\      at 15 percent O2, dry
                                                     of the control     \3\ (heated        basis.
                                                     device; and        probe not
                                                                        necessary) or
                                                                        method 10 of 40
                                                                        CFR part 60,
                                                                        appendix A-4.
                                                    iv. Measure        (3) Method 4 of    (d) Measurements to
                                                     moisture content   40 CFR part 60,    determine moisture
                                                     at the inlet and   appendix A-3, or   content must be made
                                                     outlet of the      method 320 of 40   at the same time and
                                                     control device     CFR part 63,       location as the
                                                     as needed to       appendix A, or     measurements for CO
                                                     determine CO and   ASTM D6348-03      concentration.
                                                     O2                 \1\ \3\.
                                                     concentrations
                                                     on a dry basis.

[[Page 18414]]

 
2. 4SRB stationary RICE........  a. Reduce          i. Select the      .................  (a) For formaldehyde,
                                  formaldehyde or    sampling port                         THC, O2, and moisture
                                  THC emissions.     location and the                      measurement, ducts
                                                     number/location                       <=6 inches in
                                                     of traverse                           diameter may be
                                                     points at the                         sampled at a single
                                                     inlet and outlet                      point located at the
                                                     of the control                        duct centroid and
                                                     device; 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,
                                                                                           appendix A, 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 method 7E of
                                                                                           40 CFR part 60,
                                                                                           appendix A.
                                                    ii. Measure O2 at  (1) Method 3 or    (b) Measurements to
                                                     the inlet and      3A or 3B of 40     determine O2
                                                     outlet of the      CFR part 60,       concentration must be
                                                     control device;    appendix A-2, or   made at the same time
                                                     and                ASTM D6522-00      as the measurements
                                                                        (Reapproved        for formaldehyde or
                                                                        2005) \1\ \3\      THC concentration.
                                                                        (heated probe
                                                                        not necessary).
                                                    iii. Measure       (2) Method 4 of    (c) Measurements to
                                                     moisture content   40 CFR part 60,    determine moisture
                                                     at the inlet and   appendix A-3, or   content must be made
                                                     outlet of the      method 320 of 40   at the same time and
                                                     control device     CFR part 63,       location as the
                                                     as needed to       appendix A, or     measurements for
                                                     determine          ASTM D6348-03      formaldehyde or THC
                                                     formaldehyde or    \1\ \3\.           concentration.
                                                     THC and O2
                                                     concentrations
                                                     on a dry basis;
                                                     and
                                                    iv. If             (3) Method 320 or  (d) Formaldehyde
                                                     demonstrating      323 of 40 CFR      concentration must be
                                                     compliance with    part 63,           at 15 percent O2, dry
                                                     the formaldehyde   appendix A; or     basis. Results of
                                                     percent            ASTM D6348-        this test consist of
                                                     reduction          03,\1\ \3\         the average of the
                                                     requirement,       provided in ASTM   three 1-hour or
                                                     measure            D6348-03 Annex     longer runs.
                                                     formaldehyde at    A5 (Analyte
                                                     the inlet and      Spiking
                                                     the outlet of      Technique), the
                                                     the control        percent R must
                                                     device.            be greater than
                                                                        or equal to 70
                                                                        and less than or
                                                                        equal to 130.
                                                    v. If              (4) (1) Method     (e) THC concentration
                                                     demonstrating      25A, reported as   must be at 15 percent
                                                     compliance with    propane, of 40     O2, dry basis.
                                                     the THC percent    CFR part 60,       Results of this test
                                                     reduction          appendix A-7.      consist of the
                                                     requirement,                          average of the three
                                                     measure THC at                        1-hour or longer
                                                     the inlet and                         runs.
                                                     the outlet of
                                                     the control
                                                     device.
3. Stationary RICE.............  a. Limit the       i. Select the      .................  (a) For formaldehyde,
                                  concentration of   sampling port                         CO, O2, and moisture
                                  formaldehyde or    location and the                      measurement, ducts
                                  CO in the          number/location                       <=6 inches in
                                  stationary RICE    of traverse                           diameter may be
                                  exhaust.           points at the                         sampled at a single
                                                     exhaust of the                        point located at the
                                                     stationary RICE;                      duct centroid and
                                                     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,
                                                                                           appendix A, 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 method 7E of
                                                                                           40 CFR part 60,
                                                                                           appendix A. If using
                                                                                           a control device, the
                                                                                           sampling site must be
                                                                                           located at the outlet
                                                                                           of the control
                                                                                           device.
                                                    ii. Determine the  (1) Method 3 or    (b) Measurements to
                                                     O2 concentration   3A or 3B of 40     determine O2
                                                     of the             CFR part 60,       concentration must be
                                                     stationary RICE    appendix A-2, or   made at the same time
                                                     exhaust at the     ASTM D6522-00      and location as the
                                                     sampling port      (Reapproved        measurements for
                                                     location; and      2005) \1\ \3\      formaldehyde or CO
                                                                        (heated probe      concentration.
                                                                        not necessary).
                                                    iii. Measure       (2) Method 4 of    (c) Measurements to
                                                     moisture content   40 CFR part 60,    determine moisture
                                                     of the             appendix A-3, or   content must be made
                                                     stationary RICE    method 320 of 40   at the same time and
                                                     exhaust at the     CFR part 63,       location as the
                                                     sampling port      appendix A, or     measurements for
                                                     location as        ASTM D6348-03      formaldehyde or CO
                                                     needed to          \1\ \3\.           concentration.
                                                     determine
                                                     formaldehyde or
                                                     CO and O2
                                                     concentrations
                                                     on a dry basis;
                                                     and
                                                    iv. Measure        (3) Method 320 or  (d) Formaldehyde
                                                     formaldehyde at    323 of 40 CFR      concentration must be
                                                     the exhaust of     part 63,           at 15 percent O2, dry
                                                     the stationary     appendix A; or     basis. Results of
                                                     RICE; or           ASTM D6348-        this test consist of
                                                                        03,\1\ \3\         the average of the
                                                                        provided in ASTM   three 1-hour or
                                                                        D6348-03 Annex     longer runs.
                                                                        A5 (Analyte
                                                                        Spiking
                                                                        Technique), the
                                                                        percent R must
                                                                        be greater than
                                                                        or equal to 70
                                                                        and less than or
                                                                        equal to 130.

[[Page 18415]]

 
                                                    v. Measure CO at   (4) Method 10 of   (e) CO concentration
                                                     the exhaust of     40 CFR part 60,    must be at 15 percent
                                                     the stationary     appendix A-4,      O2, dry basis.
                                                     RICE.              ASTM D6522-00      Results of this test
                                                                        (2005),\1\ \3\     consist of the
                                                                        method 320 of 40   average of the three
                                                                        CFR part 63,       1-hour or longer
                                                                        appendix A, or     runs.
                                                                        ASTM D6348-03
                                                                        \1\ \3\.
----------------------------------------------------------------------------------------------------------------
\1\ You may also use methods 3A and 10 as options to ASTM-D6522-00 (2005).
\2\ You 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.
\3\ Incorporated by reference, see Sec.   63.14.

Subpart PPPPP--National Emission Standards for Hazardous Air 
Pollutants for Engine Test Cells/Stands

0
23. Amend Sec.  63.9306 by revising paragraph (d)(2)(iv) to read as 
follows:

Sec.  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.
* * * * *

0
24. Amend Sec.  63.9322 by revising paragraph (a)(1) to read as 
follows:

Sec.  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

0
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 Sec.  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

[[Page 18416]]

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    \1\ Regarding emissions data collected during periods of startup 
or shutdown, see Sec. Sec.  63.10020(b) and (c) and 63.10021(h).
    \2\ See tables 1 and 2 to this subpart for required sample 
volumes and/or sampling run times.
    \3\ Incorporated by reference, see Sec.  63.14.

0
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 Sec.  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 [micro]g/dscm. If the RD specification is met, the results of 
the two samples shall be averaged arithmetically.
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Where:

RD = Relative Deviation between the Hg concentrations of samples 
``a'' and ``b'' (percent),
Ca = Hg concentration of Hg sample ``a'' ([micro]g/dscm), 
and
Cb = Hg concentration of Hg sample ``b'' ([micro]g/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.
* * * * *

0
27. Amend appendix A to part 63 by:
0
a. Redesignating section 6.2 under the heading ``16.0 Alternative 
Procedures'' as section 16.2 in method 315; and
0
b. In method 323:
0
i. Revising sections 10.1 and 10.3;
0
ii. In section 12.1:
0
A. Adding the entry ``b'' following the entry ``B = estimated sampling 
rate, Lpm''; and
0
B. Revising the entry ``Kc''; and
0
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 [micro]g/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 [micro]g/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 [deg]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/([micro]g/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
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* * * * *
[FR Doc. 2023-04956 Filed 3-28-23; 8:45 am]
BILLING CODE 6560-50-C