Document ID: EPA-HQ-OAR-2020-0556-0001
Agency: epa
Document Type: Proposed Rule
Title: Testing Provisions for Air Emission Sources
Posted Date: 2022-04-26T04:00Z

[Federal Register Volume 87, Number 80 (Tuesday, April 26, 2022)]
[Proposed Rules]
[Pages 24488-24510]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-07891]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 51, 60, and 63

[EPA-HQ-OAR-2020-0556; FRL-8335-03-OAR]
RIN 2060-AV35

Testing Provisions for Air Emission Sources

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: This action proposes corrections and updates to regulations 
for source testing of emissions under various rules. This proposed rule 
includes corrections to inaccurate testing provisions, updates to 
outdated procedures, and approved alternative procedures that provide 
testers enhanced flexibility. The revisions will improve the quality of 
data but will not impose new substantive requirements on source owners 
or operators.

DATES: Comments must be received on or before June 27, 2022.

ADDRESSES: You may send comments, identified by Docket ID No. EPA-HQ-
OAR-2020-0556 by any of the following methods:
     Federal eRulemaking Portal: https://www.regulations.gov 
(our preferred method). Follow the online instructions for submitting 
comments.
     Email: a-and-r [email protected]. Include docket ID No. EPA-
HQ-OAR-2020-0556 in the subject line of the message.
     Fax: (202) 566-9744.

[[Page 24489]]

     Mail: U.S. Environmental Protection Agency, EPA Docket 
Center, Office of Air and Radiation Docket, Mail Code 28221T, 1200 
Pennsylvania Avenue NW, Washington, DC 20460.
     Hand Delivery or Courier (by scheduled appointment only): 
EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution 
Avenue NW, Washington, DC 20004. The Docket Center's hours of 
operations are 8:30 a.m.-4:30 p.m., Monday through Friday (except 
Federal Holidays).
    Instructions: All submissions received must include the Docket ID 
No. for this rulemaking. Comments received may be posted without change 
to https://www.regulations.gov/, including any personal information 
provided. For detailed instructions on sending comments and additional 
information on the rulemaking process, see the ``Public Participation'' 
heading of the SUPPLEMENTARY INFORMATION section of this document. Out 
of an abundance of caution for members of the public and our staff, the 
EPA Docket Center and Reading Room are closed to the public, with 
limited exceptions, to reduce the risk of transmitting COVID-19. Our 
Docket Center staff will continue to provide remote customer service 
via email, phone, and webform. We encourage the public to submit 
comments via https://www.regulations.gov/ or email, as there may be a 
delay in processing mail and faxes. Hand deliveries and couriers may be 
received by scheduled appointment only. For further information on EPA 
Docket Center services and the current status, please visit us online 
at https://www.epa.gov/dockets.

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. Public Participation and Written Comments
II. General Information
    A. Does this action apply to me?
    B. What action is the Agency taking?
III. Background
IV. Incorporation by Reference
V. Summary of Proposed 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
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

I. Public Participation and Written Comments

    Submit your comments identified by Docket ID No. EPA-HQ-OAR-2020-
0556 at https://www.regulations.gov (our preferred method) or the other 
methods identified in the ADDRESSES section. Once submitted, comments 
cannot be edited or removed from the docket. The EPA may publish any 
comment received to its public docket. Do not submit to EPA's docket at 
https://www.regulations.gov/ any information you consider to be 
Confidential Business Information (CBI) or other information whose 
disclosure is restricted by statute. Multimedia submissions (audio, 
video, etc.) must be accompanied by a written comment. The written 
comment is considered the official comment and should include 
discussion of all points you wish to make. The EPA will generally not 
consider comments or comment contents located outside of the primary 
submission (i.e., on the web, cloud, or other file sharing system). For 
additional submission methods, the full EPA public comment policy, 
information about CBI or multimedia submissions, and general guidance 
on making effective comments, please visit https://www.epa.gov/dockets/commenting-epa-dockets.
    Public visitors are allowed in the EPA Docket Center and Reading 
Room by making an appointment in advance. Our Docket Center staff will 
continue to provide remote customer service via email, phone, and 
webform. We encourage the public to submit comments via https://www.regulations.gov/ as there may be a delay in processing mail and 
faxes. Hand deliveries or couriers will be received by scheduled 
appointment only. For further information and updates on EPA Docket 
Center services, please visit us online at https://www.epa.gov/dockets. 
The EPA continues to carefully and continuously monitor information 
from the Centers for Disease Control and Prevention (CDC), local area 
health departments, and our Federal partners so that we can respond 
rapidly as conditions change regarding COVID-19.

II. General Information

A. Does this action apply to me?

    The proposed amendments apply to industries that are subject to the 
current provisions of 40 CFR parts 51, 60, and 63. We did not list all 
of the specific affected industries or their North American Industry 
Classification

[[Page 24490]]

System (NAICS) codes herein since there are many affected 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?

    This action proposes corrections and revisions to source test 
methods, performance specifications (PS), and associated regulations. 
The corrections and revisions consist primarily of typographical 
errors, updates to testing procedures, and the addition of alternative 
equipment and methods the Agency has deemed acceptable to use.

III. 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 
promulgated on October 7, 2020 (85 FR 63394). This proposed rule 
addresses necessary corrections and revisions identified after that 
final action, many of which were brought to our attention by regulated 
sources and end-users, such as environmental consultants and compliance 
professionals. These revisions will improve the quality of data 
obtained and give source testers the flexibility to use newly approved 
alternative procedures.

IV. Incorporation by Reference

    The EPA proposes to incorporate by reference two ASTM standards. 
Specifically, the EPA proposes to incorporate ASTM D6216-20, which 
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 for accurate opacity 
monitoring measurements in regulatory environmental opacity monitoring 
applications subject to 10 percent or higher opacity standards. The EPA 
also proposes to update 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 would apply to incorporations by 
reference in 40 CFR part 60, appendix B, Performance Specification 12A 
for continuous monitoring of mercury emissions. Likewise, EPA proposes 
to update 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 ASTM. 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 proposes to incorporate by reference the American 
Public Health Association (APHA) Method 5210 Biochemical Oxygen Demand 
(BOD) from ``Standard Methods for the Examination of Water and 
Wastewater.'' This standard is acceptable as an alternative to Method 
405.1 and is available from APHA at www.standardmethods.org or by 
telephone at (844) 232-3707.
    The EPA is also proposing specific modifications to requirements in 
an existing incorporation by reference, the ASTM E2515-11 test method. 
The proposed stipulations would modify the post-test leak check 
procedures as well as add procedures for performing leak checks during 
a sampling run.

V. Summary of Proposed Amendments

    The following amendments are being proposed.

A. Method 201A of Appendix M of Part 51

    In Method 201A, the erroneous equation 25 in section 12.5 would be 
corrected.

B. General Provisions (Subpart A) of Part 60

    In the General Provisions of part 60, Sec.  60.17(h) would be 
revised to add American Society for Testing and Materials (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 would be amended to add stipulations for use of the 
ASTM E2515-11 test method. The stipulations would 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 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 would revise the language in Sec.  60.534(c) and are proposing 
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. We are proposing these 
modifications to bring appropriate QA/QC requirements to PM 
measurements required by the rule and to eliminate opportunity for 
emissions test results to be considered valid when a leaking sampling 
system allows dilution of the PM sample(s).
    We are also proposing in Sec.  60.534(d) that the 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 would be collected appropriately, and the 
compliance test measurements would not be impacted by a sampling pause 
for filter replacement at the 1-hour mark.
    The regulatory language in Sec.  60.539b(b) would be 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 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. We are 
proposing these modifications to 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

[[Page 24491]]

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. Sec.  
60.5474(b)(2), (b)(3) and (b)(6) would be corrected.
    In addition, subpart QQQQ would be amended to add stipulations for 
use of the ASTM E2515-11 test method. The stipulations would 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 Sec.  60.5476(c)(6) would be replaced with the word 
``reserved.''
    We would revise language in Sec.  60.5476(f) and are proposing 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) adding procedures for performing 
leak checks during a sampling run. We are proposing these modifications 
to 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).
    We are also proposing in Sec.  60.5476(f) that first hour PM 
emissions measurements should 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 would not be impacted by a sampling pause 
for filter replacement at the one-hour mark. In Sec.  60.5476(f), we 
would incorporate language about filter type and size acceptance 
currently in Sec.  60.5476(c)(5). Additionally, we would remove text 
relating to EN 303-5 currently found in Sec.  60.5476(f).
    The regulatory language in Sec.  60.5483(b) would be 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. We are proposing these 
modifications to 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 would be corrected to include 
the summation of CO emissions over four instead of three test 
categories.

E. Method 1 of Appendix A-1 of Part 60

    In Method 1, the heading in section 11.5.1 would be moved to 11.5, 
and the word ``procedure'' would be moved to the first sentence in 
section 11.5.1 for clarity. Section 11.5.2 would be 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, would be 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 would be 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 would be formatted correctly.

G. Method 7 of Appendix A-4 of Part 60

    In Method 7, section 10.1.3 would be 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 would be corrected.

I. Method 25 of Appendix A-7 of Part 60

    In Method 25, a record and report section (section 12.9) would be 
added to confirm that the quality control (QC) was successfully 
performed. Also, the erroneous Figure 25-6 would be corrected.

J. Method 25C of Appendix A-7 of Part 60

    In Method 25C, the nomenclature in section 12.1 for CN2 
and CmN2 would be revised to provide clarity.

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, would be revised to be consistent with the 
nomenclature in section 12.1.

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), 8.1(2)(iii), 8.1(3)(ii), 8.2(1), 
8.2(2), 8.2(3), 9.0, 12.1, 13.1, 13.2, and 16.0 reference 8) would be 
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) would be 
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 would 
be added to clarify that during a calibration, the reference gas is to 
be

[[Page 24492]]

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 would be 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 would be updated to the 
Environmental Monitoring Management Council (EMMC) methods format used 
for all other performance specifications.

O. Performance Specification 6 of Appendix B of Part 60

    In Performance Specification 6, section 13.2 would be 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.

P. Performance Specification 12A of Appendix B of Part 60

    We are proposing to revise 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 been improving since 
initially being deployed to support regulations over a decade ago. 
Therefore, we are proposing to revise section 13.3 to modify the 
alternative relative accuracy criterion such that: (1) It would apply 
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 would now be 0.5 [micro]g/scm. This 
revised criterion is consistent with revisions that we made to the 
mercury monitoring requirements in 40 CFR 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 would be made to clarify the intent of the requirements. 
In section 1.1, we would correct the language 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 would be removed since PS-
17 was never promulgated. In sections 3.11 and 3.12, language would be 
added to define commonly used acronyms, and in section 3.12, the 
language would be 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 would be 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, the 
language stating a RATA is to be conducted at the normal operating 
level would be corrected to indicate the RATA is to be conducted as 
specified in section 8.2 and to remove the statement that the 
statistical tests in section 8.3 are not required for the yearly RATA. 
In section 12.3.2, the alternative criteria language would be removed 
because it does not apply to F-factor determinations. In sections 13.1 
and 13.5, the language would be modified to add the corresponding 
alternative criteria in units of lb/mmBtu.

R. Procedure 1 of Appendix F of Part 60

    In Procedure 1, in section 4.1, a sentence would be 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) would be 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, in order to provide 
clarity and clear up any confusion, we would remove the language 
referring to the relevant performance specification and insert the 
language referring to the use of Equation 1-1.

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 would clarify 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 63, subpart UUUUU (81 FR 20172, April 6, 2016). 
We would revise the title of section 4.0 and add 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 section 
5.1.3, to add clarity we would insert 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 would be revised 
to: (1) Add ASTM D6784-16 to redesignated paragraph (i) and (2) add 
``Standard Methods for the Examination of Water and Wastewater'' Method 
5210B to new paragraph (d).

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), 
Method 405.1 would be updated to reference Method 5210B. This method 
would also be incorporated by reference in 40 CFR 63.14.

V. Standards of Performance for Hazardous Air Pollutants From Hazardous 
Waste Combustors (Subpart EEE) of Part 63

    In the appendix to subpart EEE, we would remove the erroneous 
language regarding an Interference Response Test in the introductory 
paragraph of section 5 and section 5.3 in its entirety.

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

[[Page 24493]]

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 proposing to 
revise 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 to measure the exhaust gas moisture when 
measuring the concentration of carbon monoxide (CO), formaldehyde, or 
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 would add 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) would be 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) 
would be 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 proposing to revise 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 proposing to add 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 would be corrected.

BB. Method 323 of Appendix A of Part 63

    In Method 323, sections 10.1 and 10.3 would be revised to require 
best laboratory practices. The nomenclature in section 12.1 would be 
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 would be revised 
to reflect changes in calibration procedures for calculating the mass 
of formaldehyde.

VI. Statutory and Executive Order Reviews

    Additional information about these statutes and Executive Orders 
can be found at https://www2.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 being proposed in this action to the test 
methods, performance specifications, and testing regulations only make 
corrections and minor updates to existing testing methodology. In 
addition, the proposed amendments clarify performance testing 
requirements.

C. Regulatory Flexibility Act (RFA)

    I certify that this action will not have a significant economic 
impact on a substantial number of small entities under the RFA. This 
action will not impose any requirements on small entities. This 
proposed 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 would correct and update 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 proposes to use 
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

[[Page 24494]]

higher opacity standards. The EPA also proposes to update 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. Likewise, EPA proposes to update 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 ASTM D6216-20 
and D6784-16 standards were developed and adopted by the American 
Society for Testing and Materials. The standards may be obtained from 
http://www.astm.org or from the ASTM at 100 Barr Harbor Drive, P.O. Box 
C700, West Conshohocken, PA 19428-2959.
    The EPA also proposes to use the APHA Method 5210 Biochemical 
Oxygen Demand (BOD) from ``Standard Methods for the Examination of 
Water and Wastewater.'' This standard is acceptable as an alternative 
to Method 405.1 and is available from APHA at www.standardmethods.org 
or by telephone at (844) 232-3707.
    Additionally, the EPA proposes language intended to correct a 
portion of the ASTM E2515-11 test method. The stipulations would 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 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

    The EPA believes that this action is not subject to Executive Order 
12898 (59 FR 7629, February 16, 1994) because it does not establish an 
environmental health or safety standard. This action would correct and 
update existing testing regulations.

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 proposes to amend 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 section 12.5 in Method 201A of appendix M to part 51 by 
revising Eq. 25 to read as follows:

Appendix M to Part 51--Recommended Test Methods for State 
Implementation Plans

* * * * *

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

* * * * *
    12.5 Equations. Use the following equations to complete the 
calculations required in this test method.
* * * * *
[GRAPHIC] [TIFF OMITTED] TP26AP22.077

* * * * *

PART 60--STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES

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

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

0
4. In Sec.  60.17:
0
a. Revise paragraphs (a) and (h)(179) and (191);
0
b. Redesignate paragraphs (h)(193) through (h)(212) as (h)(194) through 
(h)(213) respectively; and
0
c. Add new paragraph (h)(193).
    The additions and revisions read as follows:

Sec.  60.17   Incorporations by reference.

    (a) Certain material is incorporated by reference into this part 
with the approval of the Director of the Federal Register under 5 
U.S.C. 552(a) and 1 CFR part 51. To enforce any edition other than that 
specified in this section, the EPA must publish a document in the 
Federal Register and the material must be available to the public. All 
approved material is available for inspection at the EPA and the 
National Archives and Records Administration (NARA). Contact EPA at: 
The EPA Docket Center, Public Reading Room, EPA WJC West, Room 3334, 
1301 Constitution Ave. NW, Washington, DC, phone (202) 566-1744. For 
information on the availability of this material at NARA, email 
[email protected], or go to www.archives.gov/federal-register/cfr/ibr-locations.html. The material may be obtained from the source(s) in 
the following paragraph(s) of this section.
* * * * *
    (h) * * *
    (179) ASTM D6216-20, Standard Practice for Opacity Monitor 
Manufacturers to Certify Conformance with Design and Performance 
Specifications, 2020; IBR approved for appendix B: Performance 
Specification 1.
* * * * *
    (191) ASTM D6784-02, Standard Test Method for Elemental, Oxidized, 
Particle-Bound and Total Mercury in Flue Gas Generated from Coal-Fired 
Stationary Sources (Ontario Hydro Method); IBR approved for Sec.  
60.56c(b).
* * * * *
    (193) 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), 2016; IBR approved for 
appendix B: Performance Specification 12A.
* * * * *
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), (b) 
and (c), particulate

[[Page 24495]]

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. 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)(2): 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 Sec.  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);
* * * * *
0
7. Amend Sec.  60.5474 by revising paragraph (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
9. Amend Sec.  60.5476 by removing paragraph (c)(5) and (6) and 
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. 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)(2): 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
10. Amend Sec.  60.5483 by revising paragraph (b) to read as follows:

[[Page 24496]]

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
11. Amend Appendix A-1 to part 60 by revising sections 11.5, 11.5.1, 
and 11.5.2, and Table 1-2 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

* * * * *
    11.5 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.
    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.
* * * * *

                                                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
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
12. Amend Method 4 in Appendix A-3 to part 60 by revising Figure 4-3 to 
read as follows:

Appendix A-3 to Part 60--Test Methods 4 Through 5I

* * * * *

Method 4--Determination of Moisture Content in Stack Gases

* * * * *

[[Page 24497]]

[GRAPHIC] [TIFF OMITTED] TP26AP22.078

* * * * *
0
13. Amend Appendix A-4 to part 60 by revising section 10.1.3 in Method 
7 of 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

* * * * *
    10.1.3 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
16. Amend Appendix A-7 to part 60 by:
0
a. In Method 19, revising Equation 19-5;
0
b. In Method 25, adding sections 12.9 and 12.9.1 through 12.9.16, and 
revising Figure 25-6; and
0
c. In Method 25C, revising 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

* * * * *
[GRAPHIC] [TIFF OMITTED] TP26AP22.079

* * * * *

Method 25--Determination of Total Gaseous Nonmethane Organic Emissions 
As Carbon

* * * * *
    12.9 Record and Report Initial Method Checks as follows:

12.9.1 Calibration and Linearity Check Gas Certifications (Section 
7.2 and 7.4)
12.9.2 Condensate Trap Blank Check (Section 8.1.1)
12.9.3 Pretest Leak-Check (Section 8.1.4)
12.9.4 Condensate Recovery Apparatus (Section 10.1.1)
12.9.5 Carrier Gas and Auxiliary O2 Blank Check (Section 
10.1.1.1)
12.9.6 Oxidation Catalyst Efficiency Check. (Section 10.1.1.2)
12.9.7 System Performance Check. (Section10.1.1.3)
12.9.8 Oxidation Catalyst Efficiency Check. (Section 10.1.2.1)
12.9.9 Reduction Catalyst Efficiency Check (Section 10.1.2.2)
12.9.10 NMO Analyzer Linearity Check Calibration. (Section 10.1.2.3)
12.9.11 NMO Analyzer Daily Calibration. (Section 10.2)
12.9.12 Condensate Recovery. (Section 11.1)
12.9.13 Daily Performance Checks. (Section 11.1.1)
12.9.14 Leak-Check. (Section 11.1.1.1)
12.9.15 System Background Test. (Section 11.1.1.2)

[[Page 24498]]

12.9.16 Oxidation Catalyst Efficiency Check. (Section 11.1.1.3)
* * * * *
[GRAPHIC] [TIFF OMITTED] TP26AP22.080

* * * * *

Method 25C--Determination of Nonmethane Organic Compounds (NMOC) in 
Landfill Gases

* * * * *
    12.1 Nomenclature.
* * * * *
CN2 = N2 concentration in the landfill gas 
sample
CmN2 = Measured N2 concentration, diluted 
landfill gas sample
* * * * *
0
17. In Appendix A-8 to part 60:
0
a. Revise sections 12.4 and 12.5 in Method 26.
0
b. Revise 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

* * * * *
    12.4 Total ug HCl, HBr, or HF Per Sample.
    [GRAPHIC] [TIFF OMITTED] TP26AP22.081
    
    12.5 Total ug Cl2 or Br2 Per Sample.
    [GRAPHIC] [TIFF OMITTED] TP26AP22.082
    
* * * * *

Test Method 28WHH for Measurement of Particulate Emissions and Heating 
Efficiency of Wood-Fired Hydronic Heating Appliances

* * * * *
    13.8 Carbon Monoxide Emissions.
    For each minute of the test period, the carbon monoxide 
emissions rate (g/min) shall be calculated as:

[[Page 24499]]

[GRAPHIC] [TIFF OMITTED] TP26AP22.083

    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
18. Amend Appendix B to part 60 by:
0
a. In Performance Specification 1, revising sections 2.1, 3.1, 6.1, 
8.1(1), 8.1(2)(iii), 8.1(3)(ii), 8.2(1), 8.2(2), 8.2(3), 9.0, 12.1, 
13.1, 13.2, and 16.0 reference 8;
0
b. In Performance Specification 2, revising sections 8.3.3 and 12.5;
0
c. Revising Performance Specification 4B;
0
d. In Performance Specification 6, revising section 13.2;
0
e. In Performance Specification 12A, revising sections 8.4.2, 8.4.4, 
8.4.5, 8.4.6.1, 13.3, 17.5, and footnote to Figure 12A-3;
0
f. In Performance Specification 16, revising sections 1.1, 3.11, 3.12, 
9.1, 9.4, 12.3.2, 13.1, and 13.5.
    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

* * * * *
    2.1 ASTM D6216 (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. The opacity monitor manufacturer must test each opacity 
monitor for conformance with the manufacturer's performance 
specifications in ASTM D6216. Note: If the initial certification of 
the opacity monitor occurred before [the effective date of the final 
rule] using ASTM D6216-98, D6216-03, D6216-07, or D6216-12, it is 
not necessary to recertify using ASTM D6216-20.
* * * * *
    3.1 All definitions and discussions from section 3 of ASTM D6216 
are applicable to PS-1.
* * * * *
    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, 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.
* * * * *
    8.1 * * *
    (1) You must purchase an opacity monitor that complies with ASTM 
D6216 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 above, 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 8.1(2)(ii). The 
opacity at the alternative location is considered equivalent if 
{1{time}  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{time}  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, section 7.5. If your applicable limit is less than 10 percent 
opacity, use attenuators as described in ASTM D6216, 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{time}  ensure that the entire light beam passes 
through the attenuator, {2{time}  minimize interference from 
reflected light, and {3{time}  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. 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. 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.
    (2) Conduct the verification procedures for performance 
specifications in section 7 of ASTM D6216.
    (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 in accordance with the 
reporting requirements of section 9 in ASTM D6216.
    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, section 8. The quality 
program must include:
    (1) A quality system and
    (2) A corrective action program.
* * * * *
    12.1 Desired Attenuator Values. Calculate the desired attenuator 
value corrected to the emission outlet pathlength as follows:
[GRAPHIC] [TIFF OMITTED] TP26AP22.084

Where:

OP1 = Nominal opacity value of required low-, mid-, or 
high-range calibration attenuators.
OP2 = Desired attenuator opacity value from ASTM D6216, 
section 7.5 at the opacity limit required by the applicable subpart.
L1 = Monitoring pathlength.
L2 = Emission outlet pathlength.
* * * * *
    13.1 Design Specifications. The opacity monitoring equipment 
must comply with the design specifications of ASTM D6216.
    13.2 Manufacturer's Performance Specifications. The opacity 
monitor must comply with the manufacturer's performance 
specifications of ASTM D6216.
* * * * *
    16.0 * * *
    8. ASTM D6216-20: Standard Practice for Opacity Monitor 
Manufacturers to Certify Conformance with Design and Performance 
Specifications. ASTM. September 2020.
* * * * *

Performance Specification 2--Specifications and Test Procedures for 
SO2 and NOX Continuous Emission Monitoring 
Systems in Stationary Sources

* * * * *
    8.3.3 Conduct the CD test at the two points specified in section 
6.1.2. 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,

[[Page 24500]]

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).
* * * * *
    12.5 Relative Accuracy. Calculate the RA, expressed as a 
percentage, of a set of data as follows:
[GRAPHIC] [TIFF OMITTED] TP26AP22.085

Where:

[verbar]d[verbar] = Absolute value of the mean differences (from 
Equation 2-3).
[verbar]CC[verbar] = Absolute value of the confidence coefficient 
(from Equation 2-3).
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 Eq. 2-6 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

Analytes

------------------------------------------------------------------------
                         Analyte                              CAS No.
------------------------------------------------------------------------
Carbon Monoxide (CO)....................................        630-08-0
Oxygen (O2).............................................       7782-44-7
------------------------------------------------------------------------

Applicability

    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 the regulations. 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.
    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.
    The definitions, installation and measurement location 
specifications, test procedures, data reduction procedures, 
reporting requirements, and bibliography are the same as in PS 3 
(for O2) and PS 4A (for CO) except as otherwise noted 
below.

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.

Definitions

    The definitions are the same as in section 3.0 of PS2 with the 
following definitions added:
    Continuous Emission Monitoring System (CEMS). This definition is 
the same as PS 2 section 3.0 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.
    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.
    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.

Interferences [Reserved]

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.

Equipment and Supplies

    Same as section 6.0 of PS 2, except for the following:
    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.

Reagents and Standards

Sample Collection, Preservation, Storage, and Transport

Installation and Measurement Location Specifications

    The CEMS Installation. This specification is the same as PS 2 
section 8.1.1 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.
    Measurement Location. Same as PS 2 section 8.1.2.
    Point CEMS. The measurement point should be within or centrally 
located over the centroidal area of the stack or duct cross section.
    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.

Reference Method (RM) Measurement Location and Traverse Points

    This specification is the same as PS 2 section 8.1.3 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.
    Pretest Preparation. Install the CEMS, prepare the RM test site 
according to the specifications in section 8.1, and prepare the CEMS 
for operation according to the manufacturer's written instructions.
    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 (40 CFR part 60 appendix A). The monitoring system samples 
sequentially at the reference and traverse points throughout the 
testing period for five minutes at each point.
    Calibration Drift Test Procedure. Same as section 8.3 in PS 2.

[[Page 24501]]

    Note:  The CE and RT tests must be conducted during the CD test 
period.

    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 (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.
    Response Time Test Procedure. Same as section 8.3 in PS 4A and 
must be carried out for both the CO and O2 monitors.
    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.

Quality Control [Reserved]

Calibration and Standardization [Reserved]

Analytical Procedure

    Sample collection and analysis are concurrent for this 
Performance Specification (see section 8.0). Refer to the RM for 
specific analytical procedures.

Calculation and Data Analysis

    Summarize the results on a data sheet as shown in Figure 4B-1 
(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] TP26AP22.086

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.

Method Performance

    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.
    Calibration Error (CE) Performance Specification. The mean 
difference between the CEMS and reference values at all three test 
points (see Table 4B-1) must be no greater than 5 percent of span 
value for CO monitors and 0.5 percent for O2 monitors.
    Response Time Performance Specification. The response time for 
the CO or O2 monitor must not exceed 240 seconds.
    Relative Accuracy (RA) Performance Specification. For 
O2, same as specified in PS 3. For CO, the same as 
specified in PS 4A.

Pollution Prevention [Reserved]

Waste Management [Reserved]

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.

Reference

    40 CFR part 266, Appendix IX, section 2, ``Performance 
Specifications for Continuous Emission Monitoring Systems.''

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

                                    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 =                                                            %               %               %
----------------------------------------------------------------------------------------------------------------

[[Page 24502]]

* * * * *

Performance Specification 6--Specifications and Test Procedures for 
Continuous Emission Rate Monitoring Systems in Stationary Sources

* * * * *
    13.2 CERMS Relative Accuracy. Calculate the CERMS Relative 
Accuracy (RA) expressed as a percentage using Eq. 2-6 of section 12 
of Performance Specification 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, substitute the 
applicable emission standard value in the denominator of Eq. 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 Performance Specification 2.
* * * * *

Performance Specification 12A--Specifications and Test Procedures for 
Total Vapor Phase Mercury Continuous Emission Monitoring Systems in 
Stationary Sources

* * * * *
    8.4.2 Reference Methods (RM). Unless otherwise specified in an 
applicable subpart of the regulations, use Method 29, Method 30A, or 
Method 30B in appendix A-8 to this part or ASTM D6784 (IBR, see 
Sec.  60.17) as the RM for Hg concentration. For Method 29 and ASTM 
D6784 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 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, use a 
minimum sample time of 2 hours and for Methods 30A and 30B use a 
minimum sample time of 30 minutes.
* * * * *
    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 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 is used, 
outliers are identified through the determination of relative 
deviation (RD) of the paired RM tests. Data that do not meet the RD 
criteria must be flagged as a data quality problem and may not be 
used in the calculation of RA. The primary reason for performing 
paired RM sampling is to ensure the quality of the RM data. The 
percent RD of paired data is the parameter used to quantify data 
quality. Determine RD for paired data points as follows: Where: Ca 
and Cb are the Hg concentration values determined from the paired 
samples.
* * * * *
    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 does not exceed 0.5 [micro]g/scm.
* * * * *
    17.5 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).''
* * * * *

                                                                            Figure 12A-3--Relative Accuracy Test Data
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                     RM value       CEMS value      Difference    Run used? (yes/
                             Run No.                                   Date         Begin time       End time      ([mu]g/m\3\)    ([mu]g/m\3\)    ([mu]g/m\3\)         no)           RD \1\
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1...............................................................
2...............................................................
3...............................................................
4...............................................................
5...............................................................
6...............................................................
7...............................................................
8...............................................................
9...............................................................
10..............................................................
11..............................................................
12..............................................................
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                 Average Values
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Arithmetic Mean Difference:.....................................................................................................................................................................
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Standard Deviation:.............................................................................................................................................................................
Confidence Coefficient:.........................................................................................................................................................................
T-Value:........................................................................................................................................................................................
% Relative Accuracy:............................................................................................................................................................................
(RM)avg-(CEMS)avg:..............................................................................................................................................................................
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ Calculate the RD only if paired samples are taken using RM 30B, RM 29, or ASTM D6784. Express RD as a percentage or, for very low RM concentrations (<=1.0 [mu]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

* * * * *
    1.1 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

[[Page 24503]]

your emission limitation under 40 CFR parts 60, 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 40 CFR parts 
60, 61, and 63 after the effective date of this performance 
specification.
* * * * *
    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.
* * * * *
    9.1 QA/QC Summary. Conduct the applicable ongoing tests listed 
below.

                                         Ongoing Quality Assurance Tests
----------------------------------------------------------------------------------------------------------------
                Test                   PEMS  regulatory  purpose       Acceptability             Frequency
----------------------------------------------------------------------------------------------------------------
Sensor Evaluation...................  All.......................  ......................  Daily.
RAA.................................  All.......................  Same as for RA in Sec.  Each quarter except
                                                                   13.5.                   quarter when RATA
                                                                                           performed.
RATA................................  All.......................  Same as for RA in Sec.  Yearly in quarter when
                                                                   13.1.                   RAA not performed.
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.....  After each PEMS
 (optional).                                                                               training.
----------------------------------------------------------------------------------------------------------------

* * * * *
    9.4 Yearly Relative Accuracy Test Audit. Perform a minimum 9-run 
RATA as specified by section 8.2 on a yearly basis in the quarter 
that the RAA is not performed.
* * * * *
    12.3.2 F-test. Conduct an F-test for each of the three RA data 
sets collected at different test levels. Calculate the variances of 
the PEMS and the RM using Equation 16-6.
[GRAPHIC] [TIFF OMITTED] TP26AP22.087

    Determine if the variance of the PEMS data is significantly 
different from that of the RM data at each level by calculating the 
F-value using Equation 16-7.
[GRAPHIC] [TIFF OMITTED] TP26AP22.088

    Compare the calculated F-value with the critical value of F at 
the 95 percent confidence level with n-1 degrees of freedom. The 
critical value is obtained from Table 16-2 or a similar table for F-
distribution. If the calculated F-value is greater than the critical 
value at any level, your proposed PEMS is unacceptable.
* * * * *
    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 20 ppm (or 0.04 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
19. Amend Appendix F to part 60 by:
0
a. In Procedure 1, by revising sections 4.1, 5.2.3, and 6.2; and
0
b. In Procedure 5, by revising sections 2.5, 4.0, adding section 4.4, 
and 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

* * * * *
    4.1 CD Requirement. As described in 40 CFR 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 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, as 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 of this regulation.
* * * * *
    5.2.3 * * *
    (1) * * *
    (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 or the difference between the average 
CEMS response and the average audit value must be less than one of 
the following:

------------------------------------------------------------------------
                                                         Alternative CGA
                     Analyzer span                       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.
* * * * *
    6.2 RAA Accuracy Calculation. Use Equation 1-1 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

* * * * *
    2.5 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

[[Page 24504]]

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 
calendar 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 value, as a percentage of span, must not be greater 
than 10.0 percent.
* * * * *
    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
20. The authority citation for part 63 continues to read as follows:

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

0
21. In Sec.  63.14:
0
a. Revise paragraph (a);
0
b. Redesignate paragraphs (d) through (t) as paragraphs (e) through 
(u);
0
c. Add new paragraph (d);
0
d. Revise newly redesignated paragraph (i)(102);
0
e. Redesignate newly redesignated paragraphs (i)(103) through (116) as 
paragraphs (i)(104) through (117); and
0
f. Add new paragraph (i)(103).
    The revisions and addition read as follows:

Sec.  63.14  Incorporation by reference.

    (a) The materials listed in this section are incorporated by 
reference into this part with the approval of the Director of the 
Federal Register under 5 U.S.C. 552(a) and 1 CFR part 51. To enforce 
any edition other than that specified in this section, EPA must publish 
a document in the Federal Register and the material must be available 
to the public. All approved materials are available for inspection at 
the EPA and the National Archives and Records Administration (NARA). 
Contact EPA at: Air and Radiation Docket and Information Center (Air 
Docket) in the EPA Docket Center (EPA/DC) at Rm. 3334, EPA West Bldg., 
1301 Constitution Ave. NW, Washington, DC. The EPA/DC Public Reading 
Room hours of operation are 8:30 a.m. to 4:30 p.m., Monday through 
Friday, excluding legal holidays. The telephone number of the EPA/DC 
Public Reading Room is (202) 566-1744, and the telephone number for the 
Air Docket is (202) 566-1742. For information on the availability of 
this material at NARA, email [email protected] or go to 
www.archives.gov/federal-register/cfr/ibr-locations.html. The material 
may be obtained from the source(s) in the following paragraph(s) of 
this section.
* * * * *
    (d) American Public Health Association, 1015 15th Street NW, 
Washington, DC 20005; phone: (844) 232-3707; email: 
[email protected]; website: 
www.standardmethods.org. Standard Methods (Online) For the Examination 
of Water and Wastewater:

    (1) 5210B (Method 5210B); Biochemical Oxygen Demand (BOD), 2019; 
IBR approved for Sec.  63.457(c).
    (2) [Reserved]
* * * * *
    (i) * * *
    (102) 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.
    (103) 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), 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
22. In Sec.  63.457, revise 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 Method 
5210B (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
23. In Appendix to Subpart EEE of part 63 revise section 5, remove 
section 5.3 and redesignate section 5.4 as new section 5.3. to read as 
follows:

Appendix 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) 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) is conducted instead. Conduct an ACA as described 
in the

[[Page 24505]]

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
24. In Sec.  63.3360, revise 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
25. 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 . . .                                                     . . .
----------------------------------------------------------------------------------------------------------------
2SLB, 4SLB, and CI stationary    Reduce CO          Select the         .................  For CO, O2, and
 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.
                                                    Measure the O2 at  Method 3 or 3A or  Measurements to
                                                     the inlet and      3B of 40 CFR       determine O2 must be
                                                     outlet of the      part 60,           made at the same time
                                                     control device;    appendix A-2, or   as the measurements
                                                     and.               ASTM D6522-00      for CO concentration.
                                                                        (Reapproved
                                                                        2005) a b c
                                                                        (heated probe
                                                                        not necessary).
                                                    Measure the CO at  ASTM D6522-00      The CO concentration
                                                     the inlet and      (Reapproved        must be at 15 percent
                                                     the outlet of      2005) a b c        O2, dry basis.
                                                     the control        (heated probe
                                                     device; and.       not necessary)
                                                                        or Method 10 of
                                                                        40 CFR part 60,
                                                                        appendix A-4.
                                                    Measure moisture   Method 4 of 40     Measurements to
                                                     content at the     CFR part 60,       determine moisture
                                                     inlet and outlet   appendix A-3, or   content must be made
                                                     of the control     Method 320 of 40   at the same time and
                                                     device as needed   CFR part 63,       location as the
                                                     to determine CO    appendix A, or     measurements for CO
                                                     and O2             ASTM D 6348-03     concentration.
                                                     concentrations     \b\.
                                                     on a dry basis.
4SRB stationary RICE...........  Reduce             Select the         .................  For formaldehyde, THC,
                                  formaldehyde or    sampling port                         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.
                                                    Measure O2 at the  Method 3 or 3A or  Measurements to
                                                     inlet and outlet   3B of 40 CFR       determine O2
                                                     of the control     part 60,           concentration must be
                                                     device; and.       appendix A-2, or   made at the same time
                                                                        ASTM Method        as the measurements
                                                                        D6522-00           for formaldehyde or
                                                                        (Reapproved        THC concentration.
                                                                        2005) a b
                                                                        (heated probe
                                                                        not necessary).

[[Page 24506]]

 
                                                    Measure moisture   Method 4 of 40     Measurements to
                                                     content at the     CFR part 60,       determine moisture
                                                     inlet and outlet   appendix A-3, or   content must be made
                                                     of the control     Method 320 of 40   at the same time and
                                                     device as needed   CFR part 63,       location as the
                                                     to determine       appendix A, or     measurements for
                                                     formaldehyde or    ASTM D 6348-03     formaldehyde or THC
                                                     THC and O2         \b\.               concentration.
                                                     concentrations
                                                     on a dry basis;
                                                     and.
                                                    If demonstrating   Method 320 or 323  Formaldehyde
                                                     compliance with    of 40 CFR part     concentration must be
                                                     the formaldehyde   63, appendix A;    at 15 percent O2, dry
                                                     percent            or ASTM D6348-     basis. Results of
                                                     reduction          03,\b\ provided    this test consist of
                                                     requirement,       in ASTM D6348-03   the average of the
                                                     measure            Annex A5           three 1-hour or
                                                     formaldehyde at    (Analyte Spiking   longer runs.
                                                     the inlet and      Technique), the
                                                     the outlet of      percent R must
                                                     the control        be greater than
                                                     device.            or equal to 70
                                                                        and less than or
                                                                        equal to 130.
                                                    If demonstrating   (1) Method 25A,    THC concentration must
                                                     compliance with    reported as        be at 15 percent O2,
                                                     the THC percent    propane, of 40     dry basis. Results of
                                                     reduction          CFR part 60,       this test consist of
                                                     requirement,       appendix A-7.      the average of the
                                                     measure THC at                        three 1-hour or
                                                     the inlet and                         longer runs.
                                                     the outlet of
                                                     the control
                                                     device.
Stationary RICE................  Limit the          Select the         .................  For formaldehyde, CO,
                                  concentration of   sampling port                         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.
                                                    Determine the O2   Method 3 or 3A or  Measurements to
                                                     concentration of   3B of 40 CFR       determine O2
                                                     the stationary     part 60,           concentration must be
                                                     RICE exhaust at    appendix A-2, or   made at the same time
                                                     the sampling       ASTM Method        and location as the
                                                     port location;     D6522-00           measurements for
                                                     and.               (Reapproved        formaldehyde or CO
                                                                        2005) a b          concentration.
                                                                        (heated probe
                                                                        not necessary).
                                                    Measure moisture   Method 4 of 40     Measurements to
                                                     content of the     CFR part 60,       determine moisture
                                                     stationary RICE    appendix A-3, or   content must be made
                                                     exhaust at the     Method 320 of 40   at the same time and
                                                     sampling port      CFR part 63,       location as the
                                                     location as        appendix A, or     measurements for
                                                     needed to          ASTM D 6348-03     formaldehyde or CO
                                                     determine          \b\.               concentration.
                                                     formaldehyde or
                                                     CO and O2
                                                     concentrations
                                                     on a dry basis;
                                                     and.
                                                    Measure            Method 320 or 323  Formaldehyde
                                                     formaldehyde at    of 40 CFR part     concentration must be
                                                     the exhaust of     63, appendix A;    at 15 percent O2, dry
                                                     the stationary     or ASTM D6348-     basis. Results of
                                                     RICE; or.          03,\b\ provided    this test consist of
                                                                        in ASTM D6348-03   the average of the
                                                                        Annex A5           three 1-hour or
                                                                        (Analyte Spiking   longer runs.
                                                                        Technique), the
                                                                        percent R must
                                                                        be greater than
                                                                        or equal to 70
                                                                        and less than or
                                                                        equal to 130.
                                                    Measure CO at the  Method 10 of 40    CO concentration must
                                                     exhaust of the     CFR part 60,       be at 15 percent O2,
                                                     stationary RICE.   appendix A-4,      dry basis. Results of
                                                                        ASTM Method        this test consist of
                                                                        D6522-00           the average of the
                                                                        (2005),a b         three 1-hour or
                                                                        Method 320 of 40   longer runs.
                                                                        CFR part 63,
                                                                        appendix A, or
                                                                        ASTM D6348-03
                                                                        \b\.
----------------------------------------------------------------------------------------------------------------
\a\ You may also use Methods 3A and 10 as options to ASTM-D6522-00 (2005).
\b\ You may obtain a copy of the standard from at least one of the following addresses: ASTM International, 100
  Barr Harbor Drive, West Conshohocken, PA 19428-2959, or University Microfilms International, 300 North Zeeb
  Road, Ann Arbor, MI 48106.

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

0
26. In Sec.  63.9306, revise 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
27. In Sec.  63.9322, revise 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.
* * * * *

[[Page 24507]]

Subpart UUUUU--National Emission Standards for Hazardous Air 
Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating 
Units

0
28. 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:

    Note: Regarding emissions data collected during periods of 
startup or shutdown, see Sec. Sec.  63.10020(b) and (c) and 
63.10021(h).

----------------------------------------------------------------------------------------------------------------
                                                              You must perform the
                                                              following activities,
 To conduct a performance test for         Using . . .        as applicable to your         Using . . .\1\
   the following pollutant . . .                             input- or output-based
                                                              emission limit . . .
----------------------------------------------------------------------------------------------------------------
1. Filterable Particulate matter     Emissions Testing.....  a. Select sampling      Method 1 at appendix A-1 to
 (PM).                                                        ports location and      part 60 of this chapter.
                                                              the number of
                                                              traverse points.
                                                             b. Determine velocity   Method 2, 2A, 2C, 2F, 2G or
                                                              and volumetric flow-    2H at appendix A-1 or A-2
                                                              rate of the stack gas.  to part 60 of this
                                                                                      chapter.
                                                             c. Determine oxygen     Method 3A or 3B at appendix
                                                              and carbon dioxide      A-2 to part 60 of this
                                                              concentrations of the   chapter, or ANSI/ASME PTC
                                                              stack gas.              19.10.\2\
                                                             d. Measure the          Method 4 at appendix A-3 to
                                                              moisture content of     part 60 of this chapter.
                                                              the stack gas.
                                                             e. Measure the          Methods 5 and 5I at
                                                              filterable PM           appendix A-3 to part 60 of
                                                              concentration.          this chapter. For positive
                                                                                      pressure fabric filters,
                                                                                      Method 5D at appendix A-3
                                                                                      to part 60 of this chapter
                                                                                      for filterable PM
                                                                                      emissions. Note that the
                                                                                      Method 5 or 5I front half
                                                                                      temperature shall be
                                                                                      160[deg] 14
                                                                                      [deg]C (320[deg] 25 [deg]F).
                                                             f. Convert emissions    Method 19 F-factor
                                                              concentration to lb/    methodology at appendix A-
                                                              MMBtu or lb/MWh         7 to part 60 of this
                                                              emissions rates.        chapter or calculate using
                                                                                      mass emissions rate and
                                                                                      gross output data (see
                                                                                      Sec.   63.10007(e)).
                                     OR                      OR
                                     PM CEMS...............  a. Install, certify,    Performance Specification
                                                              operate, and maintain   11 at appendix B to part
                                                              the PM CEMS.            60 of this chapter and
                                                                                      Procedure 2 at appendix F
                                                                                      to part 60 of this
                                                                                      chapter.
                                                             b. Install, certify,    Part 75 of this chapter and
                                                              operate, and maintain   Sec.   63.10010(a), (b),
                                                              the diluent gas, flow   (c), and (d).
                                                              rate, and/or moisture
                                                              monitoring systems.
                                                             c. Convert hourly       Method 19 F-factor
                                                              emissions               methodology at appendix A-
                                                              concentrations to 30    7 to part 60 of this
                                                              boiler operating day    chapter or calculate using
                                                              rolling average lb/     mass emissions rate and
                                                              MMBtu or lb/MWh         gross output data (see
                                                              emissions rates.        Sec.   63.10007(e)).
2. Total or individual non-Hg HAP    Emissions Testing.....  a. Select sampling      Method 1 at appendix A-1 to
 metals.                                                      ports location and      part 60 of this chapter.
                                                              the number of
                                                              traverse points.
                                                             b. Determine velocity   Method 2, 2A, 2C, 2F, 2G or
                                                              and volumetric flow-    2H at appendix A-1 or A-2
                                                              rate of the stack gas.  to part 60 of this
                                                                                      chapter.
                                                             c. Determine oxygen     Method 3A or 3B at appendix
                                                              and carbon dioxide      A-2 to part 60 of this
                                                              concentrations of the   chapter, or ANSI/ASME PTC
                                                              stack gas.              19.10.\2\
                                                             d. Measure the          Method 4 at appendix A-3 to
                                                              moisture content of     part 60 of this chapter.
                                                              the stack gas.
                                                             e. Measure the HAP      Method 29 at appendix A-8
                                                              metals emissions        to part 60 of this
                                                              concentrations and      chapter. For liquid oil-
                                                              determine each          fired units, Hg is
                                                              individual HAP metals   included in HAP metals and
                                                              emissions               you may use Method 29,
                                                              concentration, as       Method 30B at appendix A-8
                                                              well as the total       to part 60 of this chapter
                                                              filterable HAP metals   or ASTM D6784; \2\ for
                                                              emissions               Method 29 or ASTM D 6784,
                                                              concentration and       you must report the front
                                                              total HAP metals        half and back half results
                                                              emissions               separately. When using
                                                              concentration.          Method 29, report metals
                                                                                      matrix spike and recovery
                                                                                      levels.
                                                             f. Convert emissions    Method 19 F-factor
                                                              concentrations          methodology at appendix A-
                                                              (individual HAP         7 to part 60 of this
                                                              metals, total           chapter or calculate using
                                                              filterable HAP          mass emissions rate and
                                                              metals, and total HAP   gross output data (see
                                                              metals) to lb/MMBtu     Sec.   63.10007(e)).
                                                              or lb/MWh emissions
                                                              rates.
3. Hydrogen chloride (HCl) and       Emissions Testing.....  a. Select sampling      Method 1 at appendix A-1 to
 hydrogen fluoride (HF).                                      ports location and      part 60 of this chapter.
                                                              the number of
                                                              traverse points.
                                                             b. Determine velocity   Method 2, 2A, 2C, 2F, 2G or
                                                              and volumetric flow-    2H at appendix A-1 or A-2
                                                              rate of the stack gas.  to part 60 of this
                                                                                      chapter.
                                                             c. Determine oxygen     Method 3A or 3B at appendix
                                                              and carbon dioxide      A-2 to part 60 of this
                                                              concentrations of the   chapter, or ANSI/ASME PTC
                                                              stack gas.              19.10.\2\
                                                             d. Measure the          Method 4 at appendix A-3 to
                                                              moisture content of     part 60 of this chapter.
                                                              the stack gas.
                                                             e. Measure the HCl and  Method 26 or Method 26A at
                                                              HF emissions            appendix A-8 to part 60 of
                                                              concentrations.         this chapter or Method 320
                                                                                      at appendix A to this part
                                                                                      or ASTM D6348-03 \2\ with
                                                                                     (1) the following
                                                                                      conditions when using ASTM
                                                                                      D6348-03:
                                                                                     (A) The test plan
                                                                                      preparation and
                                                                                      implementation in the
                                                                                      Annexes to ASTM D6348-03,
                                                                                      sections A1 through A8 are
                                                                                      mandatory;
                                                                                     (B) For ASTM D6348-03 Annex
                                                                                      A5 (Analyte Spiking
                                                                                      Technique), the percent
                                                                                      (%) R must be determined
                                                                                      for each target analyte
                                                                                      (see Equation A5.5);
                                                                                     (C) For the ASTM D6348-03
                                                                                      test data to be acceptable
                                                                                      for a target analyte, %R
                                                                                      must be 70% >=R <=130%;
                                                                                      and
                                                                                     (D) The %R value for each
                                                                                      compound must be reported
                                                                                      in the test report and all
                                                                                      field measurements
                                                                                      corrected with the
                                                                                      calculated %R value for
                                                                                      that compound using the
                                                                                      following equation:
----------------------------------------------------------------------------------------------------------------

[[Page 24508]]

[GRAPHIC] [TIFF OMITTED] TP26AP22.089

----------------------------------------------------------------------------------------------------------------
                                                              You must perform the
                                                              following activities,
 To conduct a performance test for                            as applicable to your
   the following pollutant . . .      Using . . .  (cont'd)  input- or output-based    Using . . . \1\ (cont'd)
              (cont'd)                                        emission limit . . .
                                                                    (cont'd)
----------------------------------------------------------------------------------------------------------------
                                                                                     (2) spiking levels
                                                                                      nominally no greater than
                                                                                      two times the level
                                                                                      corresponding to the
                                                                                      applicable emission limit.
                                                                                     Method 26A must be used if
                                                                                      there are entrained water
                                                                                      droplets in the exhaust
                                                                                      stream.
                                                             f. Convert emissions    Method 19 F-factor
                                                              concentration to lb/    methodology at appendix A-
                                                              MMBtu or lb/MWh         7 to part 60 of this
                                                              emissions rates.        chapter or calculate using
                                                                                      mass emissions rate and
                                                                                      gross output data (see
                                                                                      Sec.   63.10007(e)).
                                     OR                      OR                      ...........................
                                     HCl and/or HF CEMS....  a. Install, certify,    Appendix B to this subpart.
                                                              operate, and maintain
                                                              the HCl or HF CEMS.
                                                             b. Install, certify,    Part 75 of this chapter and
                                                              operate, and maintain   Sec.   63.10010(a), (b),
                                                              the diluent gas, flow   (c), and (d).
                                                              rate, and/or moisture
                                                              monitoring systems.
                                                             c. Convert hourly       Method 19 F-factor
                                                              emissions               methodology at appendix A-
                                                              concentrations to 30    7 to part 60 of this
                                                              boiler operating day    chapter or calculate using
                                                              rolling average lb/     mass emissions rate and
                                                              MMBtu or lb/MWh         gross output data (see
                                                              emissions rates.        Sec.   63.10007(e)).
4. Mercury (Hg)....................  Emissions Testing.....  a. Select sampling      Method 1 at appendix A-1 to
                                                              ports location and      part 60 of this chapter or
                                                              the number of           Method 30B at Appendix A-8
                                                              traverse points.        for Method 30B point
                                                                                      selection.
                                                             b. Determine velocity   Method 2, 2A, 2C, 2F, 2G or
                                                              and volumetric flow-    2H at appendix A-1 or A-2
                                                              rate of the stack gas.  to part 60 of this
                                                                                      chapter.
                                                             c. Determine oxygen     Method 3A or 3B at appendix
                                                              and carbon dioxide      A-1 to part 60 of this
                                                              concentrations of the   chapter, or ANSI/ASME PTC
                                                              stack gas.              19.10-1981.\2\
                                                             d. Measure the          Method 4 at appendix A-3 to
                                                              moisture content of     part 60 of this chapter.
                                                              the stack gas.
                                                             e. Measure the Hg       Method 30B at appendix A-8
                                                              emission                to part 60 of this
                                                              concentration.          chapter, ASTM D6784,\2\ or
                                                                                      Method 29 at appendix A-8
                                                                                      to part 60 of this
                                                                                      chapter; for Method 29 or
                                                                                      ASTM D 6784, you must
                                                                                      report the front half and
                                                                                      back half results
                                                                                      separately.
                                                             f. Convert emissions    Method 19 F-factor
                                                              concentration to lb/    methodology at appendix A-
                                                              TBtu or lb/GWh          7 to part 60 of this
                                                              emission rates.         chapter or calculate using
                                                                                      mass emissions rate and
                                                                                      gross output data (see
                                                                                      Sec.   63.10007(e)).
                                     OR                      OR                      ...........................
                                     Hg CEMS...............  a. Install, certify,    Sections 3.2.1 and 5.1 of
                                                              operate, and maintain   appendix A to this
                                                              the CEMS.               subpart.
                                                             b. Install, certify,    Part 75 of this chapter and
                                                              operate, and maintain   Sec.   63.10010(a), (b),
                                                              the diluent gas, flow   (c), and (d).
                                                              rate, and/or moisture
                                                              monitoring systems.
                                                             c. Convert hourly       Section 6 of appendix A to
                                                              emissions               this subpart.
                                                              concentrations to 30
                                                              boiler operating day
                                                              rolling average lb/
                                                              TBtu or lb/GWh
                                                              emissions rates.
                                     OR                      OR                      ...........................
                                     Sorbent trap            a. Install, certify,    Sections 3.2.2 and 5.2 of
                                      monitoring system.      operate, and maintain   appendix A to this
                                                              the sorbent trap        subpart.
                                                              monitoring system.
                                                             b. Install, operate,    Part 75 of this chapter and
                                                              and maintain the        Sec.   63.10010(a), (b),
                                                              diluent gas, flow       (c), and (d).
                                                              rate, and/or moisture
                                                              monitoring systems.
                                                             c. Convert emissions    Section 6 of appendix A to
                                                              concentrations to 30    this subpart.
                                                              boiler operating day
                                                              rolling average lb/
                                                              TBtu or lb/GWh
                                                              emissions rates.
                                     OR                      OR                      ...........................
                                     LEE testing...........  a. Select sampling      Single point located at the
                                                              ports location and      10% centroidal area of the
                                                              the number of           duct at a port location
                                                              traverse points.        per Method 1 at appendix A-
                                                                                      1 to part 60 of this
                                                                                      chapter or Method 30B at
                                                                                      Appendix A-8 for Method
                                                                                      30B point selection.
                                                             b. Determine velocity   Method 2, 2A, 2C, 2F, 2G,
                                                              and volumetric flow-    or 2H at appendix A-1 or A-
                                                              rate of the stack gas.  2 to part 60 of this
                                                                                      chapter or flow monitoring
                                                                                      system certified per
                                                                                      appendix A to this
                                                                                      subpart.
                                                             c. Determine oxygen     Method 3A or 3B at appendix
                                                              and carbon dioxide      A-1 to part 60 of this
                                                              concentrations of the   chapter, or ANSI/ASME PTC
                                                              stack gas.              19.10-1981,\2\ or diluent
                                                                                      gas monitoring systems
                                                                                      certified according to
                                                                                      part 75 of this chapter.
                                                             d. Measure the          Method 4 at appendix A-3 to
                                                              moisture content of     part 60 of this chapter,
                                                              the stack gas.          or moisture monitoring
                                                                                      systems certified
                                                                                      according to part 75 of
                                                                                      this chapter.
                                                             e. Measure the Hg       Method 30B at appendix A-8
                                                              emission                to part 60 of this
                                                              concentration.          chapter; perform a 30
                                                                                      operating day test, with a
                                                                                      maximum of 10 operating
                                                                                      days per run (i.e., per
                                                                                      pair of sorbent traps) or
                                                                                      sorbent trap monitoring
                                                                                      system or Hg CEMS
                                                                                      certified per appendix A
                                                                                      of this subpart.
                                                             f. Convert emissions    Method 19 F-factor
                                                              concentrations from     methodology at appendix A-
                                                              the LEE test to lb/     7 to part 60 of this
                                                              TBtu or lb/GWh          chapter or calculate using
                                                              emissions rates.        mass emissions rate and
                                                                                      gross output data (see
                                                                                      Sec.   63.10007(e)).

[[Page 24509]]

 
                                                             g. Convert average lb/  Potential maximum annual
                                                              TBtu or lb/GWh Hg       heat input in TBtu or
                                                              emission rate to lb/    potential maximum
                                                              year, if you are        electricity generated in
                                                              attempting to meet      GWh.
                                                              the 29.0 lb/year
                                                              threshold.
5. Sulfur dioxide (SO2)............  SO2 CEMS..............  a. Install, certify,    Part 75 of this chapter and
                                                              operate, and maintain   Sec.   63.10010(a) and
                                                              the CEMS.               (f).
                                                             b. Install, operate,    Part 75 of this chapter and
                                                              and maintain the        Sec.   63.10010(a), (b),
                                                              diluent gas, flow       (c), and (d).
                                                              rate, and/or moisture
                                                              monitoring systems.
                                                             c. Convert hourly       Method 19 F-factor
                                                              emissions               methodology at appendix A-
                                                              concentrations to 30    7 to part 60 of this
                                                              boiler operating day    chapter or calculate using
                                                              rolling average lb/     mass emissions rate and
                                                              MMBtu or lb/MWh         gross output data (see
                                                              emissions rates.        Sec.   63.10007(e)).
----------------------------------------------------------------------------------------------------------------
\1\ See tables 1 and 2 to this subpart for required sample volumes and/or sampling run times.
\2\ IBR, see Sec.   63.14.

* * * * *
0
29. Amend sections 4.1.1.5 and 4.1.1.5.1 under ``4. Certification and 
Recertification Requirements'' in Appendix A to subpart UUUUU of part 
63 to read as follows:

Appendix A to Subpart UUUUU--Hg Monitoring Provision

* * * * *
    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 (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 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 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.
[GRAPHIC] [TIFF OMITTED] TP26AP22.090

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 (IBR, see Sec.  63.14) 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 is used, in which case; up to 
336 operating hours may be taken to finish the test.
* * * * *
0
30. Amend Appendix A to part 63 by:
0
a. In Method 315 by redesignating section 6.2 as section 16.2, placing 
it in numerical order and revising the introductory paragraph.
0
b. In Method 323, by revising sections 10.1, and 10.3; in section 12.1 
adding entry ``b'' in alphabetical order, revising the entry 
``Kc''; and revising section 12.6.
    The revisions and addition read as follows:

Appendix A to Part 63--Test Methods

* * * * *

Method 315--Determination of Particulate and Methylene Chloride 
Extractable Matter (MCEM) From Selected Sources at Primary Aluminum 
Production Facilities

* * * * *
    16.2 Critical orifices as calibration standards. Critical 
orifices may be used as calibration standards in place of the wet 
test meter specified in section 10.3 of this method, provided that 
they are selected, calibrated, and used as follows:
* * * * *

Method 323--Measurement of Formaldehyde Emissions From Natural Gas-
Fired Stationary Sources--Acetyl Acetone Derivatization Method

* * * * *
    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 separate 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.
* * * * *
    12.1 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.

[[Page 24510]]

[GRAPHIC] [TIFF OMITTED] TP26AP22.091

* * * * *
[FR Doc. 2022-07891 Filed 4-25-22; 8:45 am]
BILLING CODE 6560-50-P