Document ID: EPA-HQ-OAR-2019-0424-0255
Agency: epa
Document Type: Proposed Rule
Title: Revisions and Confidentiality Determinations for Data Elements Under the Greenhouse Gas Reporting Rule
Posted Date: 2023-05-22T04:00Z

[Federal Register Volume 88, Number 98 (Monday, May 22, 2023)]
[Proposed Rules]
[Pages 32852-32947]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-10047]

[[Page 32851]]

Vol. 88

Monday,

No. 98

May 22, 2023

Part III

Environmental Protection Agency

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

40 CFR Part 98

Revisions and Confidentiality Determinations for Data Elements Under 
the Greenhouse Gas Reporting Rule; Proposed Rule

  Federal Register / Vol. 88 , No. 98 / Monday, May 22, 2023 / Proposed 
Rules  

[[Page 32852]]

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

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 98

[EPA-HQ-OAR-2019-0424; FRL-7230-03-OAR]
RIN 2060-AU35

Revisions and Confidentiality Determinations for Data Elements 
Under the Greenhouse Gas Reporting Rule

AGENCY: Environmental Protection Agency (EPA).

ACTION: Supplemental notice of proposed rulemaking.

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

SUMMARY: The EPA is issuing this supplemental proposal that would amend 
specific provisions in the Greenhouse Gas Reporting Rule to improve the 
quality and consistency of the rule by providing for the collection of 
improved data that would better inform and be relevant to a wide 
variety of Clean Air Act provisions that the EPA carries out. The EPA 
recently evaluated the requirements of the Greenhouse Gas Reporting 
Rule to identify areas of improvement, including updates to the 
existing calculation, recordkeeping, and reporting requirements, and 
requested information for collection of additional data to understand 
new source categories in a proposed rule (June 21, 2022). In this 
notification, the EPA is proposing additional amendments to the 
Greenhouse Gas Reporting Rule, including updates to the General 
Provisions to reflect revised global warming potentials, and is 
proposing to require reporting of greenhouse gas data from additional 
sectors--specifically energy consumption; coke calcining; ceramics 
production; calcium carbide production; and caprolactam, glyoxal, and 
glyoxylic acid production. The EPA is also proposing additional 
revisions that would improve implementation of the Greenhouse Gas 
Reporting Rule, such as updates to emissions calculation methodologies; 
revisions to reporting requirements to improve verification of reported 
data and the accuracy of the data collected; and other minor technical 
amendments, corrections, or clarifications. The EPA intends to consider 
the information received in response to this supplemental proposal 
prior to finalizing the amendments to the Greenhouse Gas Reporting Rule 
proposed on June 21, 2022. This action also proposes to establish and 
amend confidentiality determinations for the reporting of certain data 
elements to be added or substantially revised in these proposed 
amendments.

DATES: 
    Comments. Comments must be received on or before July 21, 2023. 
Comments on the information collection provisions submitted to the 
Office of Management and Budget (OMB) under the Paperwork Reduction Act 
(PRA) are best assured of consideration by OMB if OMB receives a copy 
of your comments on or before June 21, 2023.
    Public hearing. The EPA does not plan to conduct a public hearing 
unless requested. If anyone contacts us requesting a public hearing on 
or before May 30, 2023, we will hold a virtual public hearing. See 
SUPPLEMENTARY INFORMATION for information on requesting and registering 
for a public hearing.

ADDRESSES: 
    Comments. You may submit comments, identified by Docket Id. No. 
EPA-HQ-OAR-2019-0424, by any of the following methods:
    Federal eRulemaking Portal: www.regulations.gov (our preferred 
method). Follow the online instructions for submitting comments.
    Mail: U.S. Environmental Protection Agency, EPA Docket Center, 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-Friday (except Federal holidays)
    Instructions: All submissions received must include the Docket Id. 
No. for this proposed rulemaking. Comments received may be posted 
without change to 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.
    The virtual hearing, if requested, will be held using an online 
meeting platform, and the EPA will provide information on its website 
(www.epa.gov/ghgreporting) regarding how to register and access the 
hearing. Refer to the SUPPLEMENTARY INFORMATION section for additional 
information.

FOR FURTHER INFORMATION CONTACT: Jennifer Bohman, Climate Change 
Division, Office of Atmospheric Programs (MC-6207A), Environmental 
Protection Agency, 1200 Pennsylvania Ave. NW, Washington, DC 20460; 
telephone number: (202) 343-9548; email address: [email protected]. 
For technical information, please go to the Greenhouse Gas Reporting 
Program (GHGRP) website, www.epa.gov/ghgreporting. To submit a 
question, select Help Center, followed by ``Contact Us.''
    World wide web (WWW). In addition to being available in the docket, 
an electronic copy of this proposal will also be available through the 
WWW. Following the Administrator's signature, a copy of this proposed 
rule will be posted on the EPA's GHGRP website at www.epa.gov/ghgreporting.

SUPPLEMENTARY INFORMATION: 
    Written comments. Submit your comments, identified by Docket Id. 
No. EPA-HQ-OAR-2019-0424, at 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 the EPA's docket at www.regulations.gov any information you 
consider to be confidential business information (CBI), proprietary 
business information (PBI), 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). Please visit www.epa.gov/dockets/commenting-epa-dockets for additional submission methods; the full EPA 
public comment policy; information about CBI, PBI, or multimedia 
submissions, and general guidance on making effective comments.
    Participation in virtual public hearing. To request a virtual 
public hearing, please contact the person listed in the following FOR 
FURTHER INFORMATION CONTACT section by May 30, 2023. If requested, the 
virtual hearing will be held on June 6, 2023. The hearing will convene 
at 9 a.m. Eastern Time (ET) and will conclude at 3 p.m. ET. The EPA may 
close the hearing 15 minutes after the last pre-registered speaker has 
testified if there are no additional speakers. The EPA will provide 
further information about the hearing on its website (www.epa.gov/ghgreporting) if a hearing is requested.
    If a public hearing is requested, the EPA will begin pre-
registering speakers

[[Page 32853]]

for the hearing no later than one business day after a request has been 
received. To register to speak at the virtual hearing, please use the 
online registration form available at www.epa.gov/ghgreporting or 
contact us by email at [email protected]. The last day to pre-
register to speak at the hearing will be June 5, 2023. On June 5, 2023, 
the EPA will post a general agenda that will list pre-registered 
speakers in approximate order at: www.epa.gov/ghgreporting.
    The EPA will make every effort to follow the schedule as closely as 
possible on the day of the hearing; however, please plan for the 
hearings to run either ahead of schedule or behind schedule.
    Each commenter will have 5 minutes to provide oral testimony. The 
EPA encourages commenters to provide the EPA with a copy of their oral 
testimony electronically (via email) by emailing it to 
[email protected]. The EPA also recommends submitting the text of 
your oral testimony as written comments to the rulemaking docket.
    The EPA may ask clarifying questions during the oral presentations 
but will not respond to the presentations at that time. Written 
statements and supporting information submitted during the comment 
period will be considered with the same weight as oral testimony and 
supporting information presented at the public hearing.
    Please note that any updates made to any aspect of the hearing will 
be posted online at www.epa.gov/ghgreporting. While the EPA expects the 
hearing to go forward as set forth above, please monitor our website or 
contact us by email at [email protected] to determine if there are 
any updates. The EPA does not intend to publish a document in the 
Federal Register announcing updates.
    If you require the services of an interpreter or special 
accommodation such as audio description, please pre-register for the 
hearing with the public hearing team and describe your needs by May 30, 
2023. The EPA may not be able to arrange accommodations without 
advanced notice.
    Regulated entities. This is a proposed regulation. If finalized, 
these proposed revisions would affect certain entities that must submit 
annual greenhouse gas (GHG) reports under the GHGRP (40 CFR part 98). 
These are proposed amendments to existing regulations. If finalized, 
these amended regulations would also affect owners or operators of 
certain industry sectors that are direct emitters of GHGs. Regulated 
categories and entities include, but are not limited to, those listed 
in Table 1 of this preamble:

           Table 1--Examples of Affected Entities by Category
------------------------------------------------------------------------
                                  North American        Examples of
                                     Industry       facilities that may
           Category               Classification     be subject to part
                                  System (NAICS)            98:
------------------------------------------------------------------------
Adipic Acid Production........             325199  All other basic
                                                    organic chemical
                                                    manufacturing:
                                                    Adipic acid
                                                    manufacturing.
Aluminum Production...........             331313  Primary aluminum
                                                    production
                                                    facilities.
Ammonia Manufacturing.........             325311  Anhydrous ammonia
                                                    manufacturing
                                                    facilities.
Calcium Carbide Production....             325180  Other basic inorganic
                                                    chemical
                                                    manufacturing:
                                                    calcium carbide
                                                    manufacturing.
Carbon Dioxide Enhanced Oil                211120  Oil and gas
 Recovery Projects.                                 extraction projects
                                                    using carbon dioxide
                                                    enhanced oil
                                                    recovery.
Caprolactam, Glyoxal, and                  325199  All other basic
 Glyoxylic Acid Production.                         organic chemical
                                                    manufacturing.
Cement Production.............             327310  Cement manufacturing.
Ceramics Manufacturing........             327110  Pottery, ceramics,
                                                    and plumbing fixture
                                                    manufacturing.
                                           327120  Clay building
                                                    material and
                                                    refractories
                                                    manufacturing.
Coke Calcining................             299901  Coke; coke,
                                                    petroleum; coke,
                                                    calcined petroleum.
Electronics Manufacturing.....             334111  Microcomputers
                                                    manufacturing
                                                    facilities.
                                           334413  Semiconductor,
                                                    photovoltaic (PV)
                                                    (solid-state) device
                                                    manufacturing
                                                    facilities.
                                           334419  Liquid crystal
                                                    display (LCD) unit
                                                    screens
                                                    manufacturing
                                                    facilities;
                                                    Microelectromechanic
                                                    al (MEMS)
                                                    manufacturing
                                                    facilities.
Electrical Equipment                        33531  Power transmission
 Manufacture or Refurbishment.                      and distribution
                                                    switchgear and
                                                    specialty
                                                    transformers
                                                    manufacturing
                                                    facilities.
Electricity generation units               221112  Electric power
 that report through 40 CFR                         generation, fossil
 part 75.                                           fuel (e.g., coal,
                                                    oil, gas).
Electrical Equipment Use......             221121  Electric bulk power
                                                    transmission and
                                                    control facilities.
Electrical transmission and                 33361  Engine, Turbine, and
 distribution equipment                             Power Transmission
 manufacture or refurbishment.                      Equipment
                                                    Manufacturing.
Ferroalloy Production.........             331110  Ferroalloys
                                                    manufacturing.
Fluorinated Greenhouse Gas                 325120  Industrial gases
 Production.                                        manufacturing
                                                    facilities.
Geologic Sequestration........                 NA  CO2 geologic
                                                    sequestration sites.
Glass Production..............             327211  Flat glass
                                                    manufacturing
                                                    facilities.
                                           327213  Glass container
                                                    manufacturing
                                                    facilities.
                                           327212  Other pressed and
                                                    blown glass and
                                                    glassware
                                                    manufacturing
                                                    facilities.
HCFC-22 Production............             325120  Industrial gas
                                                    manufacturing:
                                                    Hydrochlorofluorocar
                                                    bon (HCFC) gases
                                                    manufacturing.
HFC-23 destruction processes               325120  Industrial gas
 that are not collocated with                       manufacturing:
 a HCFC-22 production facility                      Hydrofluorocarbon
 and that destroy more than                         (HFC) gases
 2.14 metric tons of HFC-23                         manufacturing.
 per year.
Hydrogen Production...........             325120  Hydrogen
                                                    manufacturing
                                                    facilities.
Industrial Waste Landfill.....             562212  Solid waste landfill.
Industrial Wastewater                      221310  Water treatment
 Treatment.                                         plants.
Injection of Carbon Dioxide...                211  Oil and gas
                                                    extraction.
Iron and Steel Production.....             333110  Integrated iron and
                                                    steel mills, steel
                                                    companies, sinter
                                                    plants, blast
                                                    furnaces, basic
                                                    oxygen process
                                                    furnace (BOPF)
                                                    shops.
Lead Production...............                331  Primary metal
                                                    manufacturing.
Lime Manufacturing............             327410  Lime production.
Magnesium Production..........             331410  Nonferrous metal
                                                    (except aluminum)
                                                    smelting and
                                                    refining: Magnesium
                                                    refining, primary.
Nitric Acid Production........             325311  Nitrogenous
                                                    fertilizer
                                                    manufacturing:
                                                    Nitric acid
                                                    manufacturing.
Petroleum and Natural Gas                  486210  Pipeline
 Systems.                                           transportation of
                                                    natural gas.

[[Page 32854]]

 
                                           221210  Natural gas
                                                    distribution
                                                    facilities.
                                           211120  Crude petroleum
                                                    extraction.
                                           211130  Natural gas
                                                    extraction.
Petrochemical Production......             324110  Petrochemicals made
                                                    in petroleum
                                                    refineries.
Petroleum Refineries..........             324110  Petroleum refineries.
Phosphoric Acid Production....             325312  Phosphatic fertilizer
                                                    manufacturing.
Pulp and Paper Manufacturing..             322110  Pulp mills.
                                           322120  Paper mills.
                                           322130  Paperboard mills.
                               -----------------------------------------
Miscellaneous Uses of                 Facilities included elsewhere
 Carbonate.
                               -----------------------------------------
Municipal Solid Waste                      562212  Solid waste
 Landfills.                                         landfills.
                                           221320  Sewage treatment
                                                    facilities.
Silicon Carbide Production....             327910  Silicon carbide
                                                    abrasives
                                                    manufacturing.
Soda Ash Production...........             325180  Other basic inorganic
                                                    chemical
                                                    manufacturing: Soda
                                                    ash manufacturing.
Suppliers of Carbon Dioxide...             325120  Industrial gas
                                                    manufacturing
                                                    facilities.
Suppliers of Industrial                    325120  Industrial greenhouse
 Greenhouse Gases.                                  gas manufacturing
                                                    facilities.
Titanium Dioxide Production...             325180  Other basic inorganic
                                                    chemical
                                                    manufacturing:
                                                    Titanium dioxide
                                                    manufacturing.
Underground Coal Mines........             212115  Underground coal
                                                    mining.
Zinc Production...............             331410  Nonferrous metal
                                                    (except aluminum)
                                                    smelting and
                                                    refining: Zinc
                                                    refining, primary.
Importers and Exporters of Pre-            423730  Air-conditioning
 charged Equipment and Closed-                      equipment (except
 Cell Foams.                                        room units) merchant
                                                    wholesalers.
                                           333415  Air-conditioning
                                                    equipment (except
                                                    motor vehicle)
                                                    manufacturing.
                                           423620  Air-conditioners,
                                                    room, merchant
                                                    wholesalers.
                                           449210  Electronics and
                                                    Appliance retailers.
                                           326150  Polyurethane foam
                                                    products
                                                    manufacturing.
                                           335313  Circuit breakers,
                                                    power,
                                                    manufacturing.
                                           423610  Circuit breakers and
                                                    related equipment
                                                    merchant
                                                    wholesalers.
------------------------------------------------------------------------

    Table 1 of this preamble is not intended to be exhaustive, but 
rather provides a guide for readers regarding facilities likely to be 
affected by this proposed action. This table lists the types of 
facilities that the EPA is now aware could potentially be affected by 
this action. Other types of facilities than those listed in the table 
could also be subject to reporting requirements. To determine whether 
you would be affected by this proposed action, you should carefully 
examine the applicability criteria found in 40 CFR part 98, subpart A 
(General Provisions) and each source category. Many facilities that are 
affected by 40 CFR part 98 have greenhouse gas emissions from multiple 
source categories listed in Table 1 of this preamble. If you have 
questions regarding the applicability of this action to a particular 
facility, consult the person listed in the FOR FURTHER INFORMATION 
CONTACT section.
    Acronyms and Abbreviations. The following acronyms and 
abbreviations are used in this document.

AGA American Gas Association
AIM American Innovation and Manufacturing Act of 2020
ANSI American National Standards Institute
API American Petroleum Institute
AR5 Fifth Assessment Report
AR6 Sixth Assessment Report
ASME American Society of Mechanical Engineers
ASTM American Society for Testing and Materials
BACT best available control technology
BAMM best available monitoring methods
BCFC bromochlorofluorocarbons
BFC bromofluorocarbons
BOPF basic oxygen process furnace
CAA Clean Air Act
CAS Chemical Abstract Service
CBI confidential business information
CBP U.S. Customs and Border Protection
CCUS carbon capture, utilization, and sequestration
CDC Centers for Disease Control and Prevention
CEMS continuous emission monitoring system
CFC chlorofluorocarbons
CFR Code of Federal Regulations
CGA cylinder gas audit
CF4 perfluoromethane
CH4 methane
CHP combined heat and power
CMA Conference of the Parties serving as the meeting of the Parties 
to the Paris Agreement
CO2 carbon dioxide
CO2e carbon dioxide equivalent
COVID-19 Coronavirus 2019
CSA CSA Group
DOC degradable organic carbon
DOE Department of Energy
DRE destruction and removal efficiency
EGU electricity generating unit
e-GGRT electronic Greenhouse Gas Reporting Tool
eGRID Emissions & Generation Resource Database
EF emission factor
EG emission guidelines
EIA Energy Information Administration
EOR enhanced oil recovery
EPA U.S. Environmental Protection Agency
ET Eastern time
FAQ frequently asked question
FR Federal Register
F-GHG fluorinated greenhouse gas
F-HTFs fluorinated heat transfer fluids
GHG greenhouse gas
GHGRP Greenhouse Gas Reporting Program
GWP global warming potential
HAWK HFC and ODS Allowance Tracking
HBCFC hydrobromochlorofluorocarbons
HBFC hydrobromofluorocarbons
HCFC hydrochlorofluorocarbons
HCFE hydrochlorofluoroethers
HFC hydrofluorocarbons
HFE hydrofluoroethers
HTF heat transfer fluid
HTS Harmonized Tariff System
ICR Information Collection Request
IPCC Intergovernmental Panel on Climate Change
ISBN International Standard Book Number
ISO International Standards Organization
IVT Inputs Verification Tool
k first order decay rate
kWh kilowatt hour
LDC local distribution company
MECS Manufacturing and Energy Consumption Survey
MEMP Metered Energy Monitoring Plan
mmBtu million British thermal units

[[Page 32855]]

MRV monitoring, reporting, and verification plan
mt metric tons
mtCO2e metric tons carbon dioxide equivalent
MWh megawatt-hour
MSW municipal solid waste
N2O nitrous oxide
NAICS North American Industry Classification System
NIST National Institute of Standards and Technology
NSPS new source performance standards
OMB Office of Management and Budget
PBI proprietary business information
PFC perfluorocarbon
POX partial oxidation
ppm parts per million
PRA Paperwork Reduction Act
PSA pressure swing adsorption
PSD prevention of significant deterioration
QA/QC quality assurance/quality control
RFA Regulatory Flexibility Act
REC renewable energy credit
RY reporting year
SAR Second Assessment Report
SDI Strategic Defense Initiative
SF6 sulfur hexafluoride
SMR steam methane reforming
TRL technology readiness level
TSD technical support document
UIC underground injection control
U.S. United States
UMRA Unfunded Mandates Reform Act of 1995
UNFCCC United Nations Framework Convention on Climate Change
WGS water gas shift
WWW World Wide Web

Contents

I. Background
    A. How is this preamble organized?
    B. Background on This Supplemental Proposed Rule
    C. Legal Authority
II. Overview and Rationale for Proposed Amendments to 40 CFR Part 98
    A. Revisions to Global Warming Potentials
    B. Revisions To Expand Source Categories and Address Potential 
Gaps in Reporting of Emissions Data for Specific Sectors
    C. Improvements to Existing and Proposed Emissions Estimation 
Methodologies
    D. Revisions to Reporting Requirements To Improve Verification 
and the Accuracy of the Data Collected
    E. Technical Amendments, Clarifications, and Corrections
III. Proposed Amendments to Part 98
    A. Subpart A--General Provisions
    B. Subpart C--General Stationary Fuel Combustion Sources
    C. Subpart F--Aluminum Production
    D. Subpart G--Ammonia Manufacturing
    E. Subpart I--Electronics Manufacturing
    F. Subpart N--Glass Production
    G. Subpart P--Hydrogen Production
    H. Subpart Y--Petroleum Refineries
    I. Subpart AA--Pulp and Paper Manufacturing
    J. Subpart HH--Municipal Solid Waste Landfills
    K. Subpart OO--Suppliers of Industrial Greenhouse Gases
    L. Subpart PP--Suppliers of Carbon Dioxide
    M. Subpart QQ--Importers and Exporters of Fluorinated Greenhouse 
Gases Contained in Pre-Charged Equipment and Closed-Cell Foams
    N. Subpart RR--Geologic Sequestration of Carbon Dioxide
    O. Subpart UU--Injection of Carbon Dioxide
    P. Subpart VV--Geologic Sequestration of Carbon Dioxide With 
Enhanced Oil Recovery Using ISO 27916
IV. Proposed Amendments To Add New Source Categories to Part 98
    A. Subpart B--Energy Consumption
    B. Subpart WW--Coke Calciners
    C. Subpart XX--Calcium Carbide Production
    D. Subpart YY--Caprolactam, Glyoxal, and Glyoxylic Acid 
Production
    E. Subpart ZZ--Ceramics Production
V. Schedule for the Proposed Amendments
VI. Proposed Confidentiality Determinations for Certain Data 
Reporting Elements
    A. Overview and Background
    B. Proposed Confidentiality Determinations
    C. Proposed Reporting Determinations for Inputs to Emissions 
Equations
    D. Request for Comments on Proposed Category Assignments, 
Confidentiality Determinations, or Reporting Determinations
VII. Impacts of the Proposed Amendments
VIII. 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 That Significantly Affect 
Energy Supply, Distribution, or Use
    I. National Technology Transfer and Advancement Act
    J. Executive Order 12898: Federal Actions To Address 
Environmental Justice in Minority Populations and Low-Income 
Populations
    K. Determination under CAA Section 307(d)

I. Background

A. How is this preamble organized?

    Section I of this preamble contains background information on the 
June 21, 2022 proposed rule (87 FR 36920, hereafter referred to as 
``2022 Data Quality Improvements Proposal'') and how the EPA identified 
additional information to support further revisions to improve the 
GHGRP that are included in this supplemental proposal. This section 
also discusses the EPA's legal authority under the Clean Air Act (CAA) 
to promulgate (including subsequent amendments to) the GHG Reporting 
Rule, codified at 40 CFR part 98 (hereinafter referred to as ``part 
98''), and the EPA's legal authority to make confidentiality 
determinations for new or revised data elements required by these 
amendments or for existing data elements for which a confidentiality 
determination has not previously been proposed. Section II of this 
preamble describes the types of amendments included in this proposed 
rule and includes the rationale for each type of proposed change. 
Section III of this preamble is organized by existing part 98 subpart 
and contains detailed information on the proposed revisions and the 
rationale for the proposed amendments in each section. Section IV of 
this preamble describes five newly proposed part 98 subparts and 
contains detailed information and rationale for the requirements for 
each proposed source category. Section V of this preamble discusses the 
proposed schedule for implementing these revisions to part 98. Section 
VI of this preamble discusses the proposed confidentiality 
determinations for new or substantially revised (i.e., requiring 
additional or different data to be reported) data reporting elements, 
as well as for certain existing data elements for which the EPA is 
proposing a new determination. Section VII of this preamble discusses 
the impacts of the proposed amendments. Section VIII of this preamble 
describes the statutory and Executive order requirements applicable to 
this action.

B. Background on This Supplemental Proposed Rule

    In the 2022 Data Quality Improvements Proposal, the EPA proposed 
amendments to specific provisions of the GHGRP where we identified 
opportunities for improvement, such as where the rule may be modified 
to reflect the EPA's current understanding of U.S. GHG emission trends, 
or to improve data collection and reporting where additional data may 
be necessary to better understand emissions from specific sectors or 
inform future policy decisions (87 FR 36920, June 21, 2022). The 2022 
Data Quality Improvements Proposal included updates to emission factors 
and refinements to existing emissions estimation methodologies to 
reflect an improved understanding of emission sources and end uses of 
GHGs. Additionally, it proposed to collect additional data to 
understand new source categories or new emission sources for specific 
sectors; to improve the EPA's understanding of the sector-

[[Page 32856]]

specific processes or other factors that influence GHG emission rates; 
to improve verification of collected data; and to provide additional 
data to complement or inform other EPA programs. In other cases, we 
proposed revisions to resolve gaps in the current coverage of the GHGRP 
that leave out potentially significant sources of GHG emissions or end 
uses. For example, the proposed revisions included new reporting of 
direct air capture as a carbon capture option for suppliers of carbon 
dioxide; addition of a new subpart for quantifying geologic 
sequestration in association with enhanced oil recovery operations; and 
an updated calculation methodology to estimate emissions from large, 
atypical release events at oil and gas facilities. The EPA also 
proposed revisions that clarify or update provisions that may be 
unclear, or where we identified specific provisions in part 98 that 
would streamline calculation, monitoring, or reporting to provide 
flexibility or increase the efficiency of data collection. Finally, the 
EPA also solicited comment on expanding the GHGRP to include several 
new source categories that could improve the EPA's understanding of 
GHGs, including energy consumption; ceramics production; calcium 
carbide production; caprolactam, glyoxal, and glyoxylic acid 
production; coke calcining; and CO2 utilization (see section 
IV of the 2022 Data Quality Improvements Proposal at 87 FR 37016), as 
well as requesting comment on potential future amendments to add new 
calculation, monitoring, and reporting requirements.
    As stated in the 2022 Data Quality Improvements Proposal, the data 
collected under part 98 are used to inform the EPA's understanding of 
the relative emissions and distribution of emissions from specific 
industries, the factors that influence GHG emission rates, and to 
inform policy options and potential regulations. Since publishing the 
proposed amendments, the EPA has received or identified new information 
to further improve the data collected under the GHGRP, and has 
subsequently identified additional amendments that the EPA is putting 
forward in this supplemental proposal. Some of the additional 
amendments are informed by a review of comments raised by stakeholders 
on the 2022 Data Quality Improvements Proposal (e.g., see sections 
III.J and III.P of this preamble). Other proposed changes are based on 
additional data gaps the EPA has observed in collected data, either 
where additional data would improve verification of data reported to 
the GHGRP (see section II.D of this preamble) or where additional data 
is needed to help our understanding of changing industry emission 
trends (see sections II.B and II.C of this preamble). Based on review 
of this information, the EPA is proposing additional amendments to part 
98, described in sections II through IV of this preamble, that build on 
and improve the amendments proposed in the 2022 Data Quality 
Improvements Proposal or that would further enhance the quality of part 
98 and implementation of the GHGRP.
    In some cases, the EPA has identified updated guidance on GHG 
estimation methods or advances in the scientific literature. For 
example, through this notification, the EPA is proposing a 
comprehensive update to the global warming potentials (GWPs) in Table 
A-1 to subpart A of part 98, in part to ensure that the GWPs used in 
the GHGRP are consistent with those recently agreed upon by the Parties 
to the United Nations Framework Convention on Climate Change (UNFCCC) 
for purposes of GHG reporting. The Parties specified the agreed-on GWPs 
in November 2021 (see section III.A.1 of this preamble), which was too 
late to allow the EPA to consider proposing a comprehensive GWP update 
in the 2022 Data Quality Improvement Proposal.\1\ We have subsequently 
reviewed and are proposing to include updated GWPs in this proposed 
rule.
---------------------------------------------------------------------------

    \1\ Although we proposed changes to certain chemical specific 
and default global warming potentials in Table A-1 to subpart A of 
part 98 in the 2022 Data Quality Improvements Proposal, these were 
limited updates to GWPs of fluorinated GHGs that are not required to 
be reported under the UNFCCC because they are not 
hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, or 
nitrogen trifluoride.
---------------------------------------------------------------------------

    In other cases, we have identified new data supporting additional 
improvements to the calculation, monitoring, and recordkeeping 
requirements, including revisions and clarifications not previously 
proposed, that would address potential data gaps and improve the 
quality of the data collected in the GHGRP. For example, the EPA is 
proposing to incorporate additional revisions to the Municipal Solid 
Waste (MSW) landfill source category in light of recent aerial studies 
that indicate that methane emissions from landfills may be considerably 
higher than the methane emissions currently reported under subpart HH 
of part 98 (Municipal Solid Waste Landfills). The proposed amendments 
incorporate an updated emissions estimation methodology that would 
improve the accuracy and coverage of the greenhouse gas data from 
landfills. These data would be used to inform the EPA's understanding 
of methane emissions from MSW landfills and future policy decisions 
under the CAA. For example, the current equations account for fugitive 
methane emissions passing through intact cover systems. Collecting 
surface emissions data under the proposed revisions would inform the 
EPA's understanding of the degree to which breakdown in cover materials 
is occurring and the impacts on methane emission rates.
    This supplemental proposal also incorporates consideration of 
information received in response to our request for comment on certain 
topics in the 2022 Data Quality Improvement Proposal. In that proposal, 
we requested comment on potential future amendments to improve the 
coverage of U.S. GHG emissions and supply captured by the GHGRP. The 
EPA has reviewed comments received in response to the call for 
information, along with additional data that the EPA has collected, and 
is proposing to establish new subparts with specific reporting 
provisions under part 98 for the source categories of energy 
consumption; coke calciners; ceramics production; calcium carbide 
production; and caprolactam, glyoxal, and glyoxylic acid production. 
The proposed revisions would improve the data collected under the GHGRP 
by better capturing the changing landscape of greenhouse gas emissions, 
providing for more complete coverage of U.S. GHG emission sources, and 
providing a more comprehensive approach to understanding GHG emissions.
    For other revisions, we are proposing to clarify or correct 
specific proposed provisions of the 2022 Data Quality Improvements 
Proposal. For instance, we are proposing to clarify the applicability 
requirements of proposed subpart VV of part 98 (Geologic Sequestration 
of Carbon Dioxide With Enhanced Oil Recovery Using ISO 27916), a new 
subpart for quantifying geologic sequestration in association with 
enhanced oil recovery (EOR) operations, which was included in the 2022 
Data Quality Improvements Proposal. Following the initial proposal, we 
received feedback from stakeholders highlighting ambiguity in the 
applicability of the proposed source category and questioning whether 
EOR operators electing to use the International Standards Organization 
(ISO) standard designated as CSA Group (CSA)/American National 
Standards Institute (ANSI) ISO 27916:2019, Carbon Dioxide Capture, 
Transportation

[[Page 32857]]

and Geological Storage--Carbon Dioxide Storage Using Enhanced Oil 
Recovery (CO2-EOR) (hereafter referred to as ``CSA/ANSI ISO 
27916:2019''), must mandatorily report under the new proposed subpart 
VV or would have the option to continue reporting under subpart UU 
(Injection of Carbon Dioxide). We are proposing the applicability of 
the source category in this supplemental notification to better reflect 
our initial intent, which was that operators electing to use CSA/ANSI 
ISO 27916:2019 to quantify geologic sequestration of CO2 
would be required to report under subpart VV, and proposing harmonizing 
revisions to subpart UU (Injection of Carbon Dioxide). This 
supplemental proposal provides information about these proposed updates 
for public review and comment.
    This supplemental proposal does not address implementation of 
provisions of the Inflation Reduction Act which was signed into law on 
August 16, 2022. Section 60113 of the Inflation Reduction Act amended 
the CAA by adding section 136, ``Methane Emissions and Waste Reduction 
Incentive Program for Petroleum and Natural Gas Systems.'' The EPA 
intends to take one or more separate actions in the coming months 
related to implementation of the Methane Emissions and Waste Reduction 
Incentive Program, including a future rulemaking to propose revisions 
to certain requirements of subpart W of part 98 (Petroleum and Natural 
Gas Systems). Accordingly, the Methane Emissions and Waste Reduction 
Incentive Program is outside the scope of this supplemental proposed 
rule.

C. Legal Authority

    The EPA is proposing these rule amendments under its existing CAA 
authority provided in CAA section 114. As stated in the preamble to the 
Mandatory Reporting of Greenhouse Gases final rule (74 FR 56260, 
October 30, 2009) (hereinafter referred to as ``2009 Final Rule''), CAA 
section 114(a)(1) provides the EPA broad authority to require the 
information proposed to be gathered by this rule because such data 
would inform and are relevant to the EPA's carrying out of a variety of 
CAA provisions. See the preambles to the proposed GHG Reporting Rule 
(74 FR 16448, April 10, 2009) (hereinafter referred to as ``2009 
Proposed Rule'') and the 2009 Final Rule for further information.

II. Overview and Rationale for Proposed Amendments to 40 CFR Part 98

    In general, this supplemental proposal includes the following 
proposed revisions to better inform EPA policies and programs under the 
CAA:
     Revisions to Table A-1 to the General Provisions of part 
98 to include updated GWPs to reflect advances in scientific knowledge 
and better characterize the climate impacts of certain GHGs, including 
agreed-upon values established by the UNFCCC, and to maintain 
comparability and consistency with the Inventory of U.S. Greenhouse Gas 
Emissions and Sinks \2\ (hereafter referred to as ``the Inventory'') 
and other analyses produced by the EPA;
---------------------------------------------------------------------------

    \2\ The EPA's GHG Inventory is available at https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks.
---------------------------------------------------------------------------

     Revisions to expand source categories or add new source 
categories to address potential gaps in reporting of emissions data for 
specific sectors in order to improve the accuracy and completeness of 
the data provided by the GHGRP;
     Revisions to refine existing calculation methodologies to 
reflect an improved understanding of emissions sources and end uses of 
GHGs, to incorporate more recent research on GHG emissions or 
formation, or to improve verification of reported emissions;
     Revisions to add or modify reporting requirements to 
eliminate data gaps and improve verification of emissions estimates; 
and
     Revisions that clarify requirements that reporters have 
previously found vague to ensure that accurate data are being 
collected, and editorial corrections or harmonizing changes that would 
improve the public's understanding of the rule.
    Overall, the proposed changes in this supplemental notification 
would provide a more comprehensive, nationwide GHG emissions profile 
reflective of the origin and distribution of GHG emissions in the 
United States and would more accurately inform EPA policy options for 
potential regulatory or non-regulatory CAA programs. The EPA 
additionally uses the data from the GHGRP, which would include data 
from these proposed changes, to improve estimates used in the 
Inventory.
    Sections II.A through II.E of this preamble provide additional 
rationale for the proposed changes. Details for the specific amendments 
proposed for each subpart are included in sections III and IV of this 
preamble. We are seeking public comment only on the proposed revisions 
and issues specifically identified in this supplemental notification 
for the identified subparts. We expect to deem any comments received in 
response to this notification that address other aspects of 40 CFR part 
98 to be outside of the scope of this supplemental proposed rulemaking.

A. Revisions to Global Warming Potentials

    Table A-1 to subpart A of 40 CFR part 98 (``Table A-1'') is a 
compendium of chemical-specific and default GWP values of GHGs that are 
required to be reported under one or more subparts of the GHG Reporting 
Rule. These GWPs are used to convert tons of chemical into tons of 
CO2-equivalent (CO2e) for purposes of various 
calculations and reporting under the rule. The EPA is proposing 
revisions to Table A-1 to update the chemical-specific GWP values of 
certain GHGs to reflect GWPs from the IPCC Fifth Assessment Report 
(hereinafter referred to as ``AR5'') \3\ and, for certain GHGs that do 
not have chemical-specific GWPs listed in AR5, to adopt GWP values from 
the IPCC Sixth Assessment Report (hereinafter referred to as 
``AR6'').\4\ The EPA is also proposing to revise and expand the set of 
default GWPs in Table A-1, which are applied to GHGs for which peer-
reviewed chemical-specific GWPs are not available. With these changes, 
the GWP values in Table A-1 would reflect more recent science regarding 
the atmospheric impacts of non-CO2 GHGs, and the GWP values 
used for the GHGRP would continue to be consistent with the GWP values 
used for the Inventory and other EPA programs. (As

[[Page 32858]]

discussed further below, the Inventory incorporates the GWP values 
agreed on by the parties to the UNFCCC, who agreed to use the GWP 
values in AR5 beginning in 2024.)
---------------------------------------------------------------------------

    \3\ IPCC, 2013: Climate Change 2013: The Physical Science Basis. 
Contribution of Working Group I to the Fifth Assessment Report of 
the Intergovernmental Panel on Climate Change [Stocker, T.F., D. 
Qin, G.-K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, 
Y. Xia, V. Bex and P.M. Midgley (eds.)]. Cambridge University Press, 
Cambridge, United Kingdom and New York, NY, USA, 1535 pp. The GWPs 
are listed in Table 8.A.1 of Appendix 8.A: Lifetimes, Radiative 
Efficiencies and Metric Values, which appears on pp. 731-737 of 
Chapter 8, ``Anthropogenic and Natural Radiative Forcing.''
    \4\ Smith, C., Z.R.J. Nicholls, K. Armour, W. Collins, P. 
Forster, M. Meinshausen, M.D. Palmer, and M. Watanabe, 2021: The 
Earth's Energy Budget, Climate Feedbacks, and Climate Sensitivity 
Supplementary Material. In Climate Change 2021: The Physical Science 
Basis. Contribution of Working Group I to the Sixth Assessment 
Report of the Intergovernmental Panel on Climate Change [Masson-
Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. P[eacute]an, S. 
Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. 
Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, 
O. Yelek[ccedil]i, R. Yu, and B. Zhou (eds.)]. Available from 
www.ipcc.ch/ The AR6 GWPs are listed in Table 7.SM.7, which appears 
on page 16 of the Supplementary Material.
---------------------------------------------------------------------------

    As discussed in this section of the preamble, the GWP values 
currently in Table A-1 to part 98 are drawn both from the IPCC Fourth 
Assessment Report \5\ (hereinafter referred to as ``AR4'') and, for 
multiple GHGs that do not have GWPs listed in AR4, from AR5. The 
proposed GWP values are drawn from AR5, and for multiple GHGs that do 
not have GWPs listed in AR5, from AR6. Consistent with our approach 
since the inception of the GHGRP, we are proposing to adopt the AR5 and 
AR6 GWPs based on a 100-year time horizon. Note that these proposed 
revisions are in addition to the 2022 Data Quality Improvements 
Proposal to add a chemical-specific GWP of 0.14 for carbonic difluoride 
and to expand the fluorinated greenhouse gas (F-GHG) group for several 
types of unsaturated compounds to include additional types of 
unsaturated compounds. GWPs that have been newly evaluated or 
reevaluated in the peer-reviewed scientific literature are periodically 
consolidated and published by the IPCC. Since 1990, there have been six 
IPCC Assessment Reports, each of which included a set of revised and 
expanded GWPs. For purposes of reporting their GHG emissions under the 
UNFCCC, the Parties to the UNFCCC have successively adopted the 100-
year GWPs in three of the IPCC Assessment Reports, beginning with the 
SAR, advancing to AR4 and, starting in 2024, moving to AR5.
---------------------------------------------------------------------------

    \5\ IPCC Fourth Assessment Report (AR4), 2007. Climate Change 
2007: The Physical Science Basis. Contribution of Working Group I to 
the Fourth Assessment Report of the Intergovernmental Panel on 
Climate Change [Core Writing Team, Pachauri, R.K and Reisinger, A. 
(eds.)]. IPCC, Geneva, Switzerland, 104 pp.
---------------------------------------------------------------------------

    Published in 2014, AR5 includes revised GWPs for the GHGs with GWPs 
in AR4 as well as for multiple additional GHGs. The revised GWPs 
reflect advances in scientific knowledge on the radiative efficiencies, 
atmospheric lifetimes, and other characteristics of these GHGs and of 
CO2, and they also account for the growing background 
concentrations of GHGs (particularly CO2) in the 
atmosphere.\6\ AR5 therefore reflects an improved scientific 
understanding of the radiative effects \7\ of these gases in the 
atmosphere. As noted in the preamble to the 2009 Final Rule, it is the 
EPA's intent to periodically update Table A-1 through notice and 
comment rulemaking as GWPs are evaluated or re-evaluated by the 
scientific community (74 FR 56348; October 30, 2009). Further, as noted 
in the preamble to the 2013 Revisions to the Greenhouse Gas Reporting 
Rule and Final Confidentiality Determinations for New or Substantially 
Revised Data Elements (78 FR 71904, 71911; November 29, 2013, hereafter 
``the 2013 Final Rule''), which updated GWPs in Table A-1, ``each 
successive assessment provides more accurate GWP estimates as 
experiments and improved computational methods lead to more accurate 
estimates of the radiative efficiencies, atmospheric lifetimes, and 
indirect effects of the various gases. Additionally, the more recent 
assessments reflect more up-to-date background concentrations, which 
are necessary for accurately calculating the radiative efficiency of 
the different gases.'' Therefore, adopting the GWP values in AR5 (and 
in AR6 for GHGs that do not have GWPs in AR5) would support the overall 
goals of the GHGRP to collect high-quality GHG data and to incorporate 
metrics that reflect scientific updates as they are adopted.
---------------------------------------------------------------------------

    \6\ Increasing background concentrations of a GHG in the 
atmosphere can lower the impact of subsequent emissions.
    \7\ Radiative forcing is the measurement of the capacity of a 
gas or other forcing agent to affect the balance of energy in 
Earth's atmosphere based in the difference in incoming solar 
radiation and outgoing infrared radiation.
---------------------------------------------------------------------------

    The proposed changes to Table A-1 would also ensure that the data 
collected in the GHGRP can be compared to the data collected and 
presented by other EPA programs and by national and international GHG 
inventories. The proposed changes, with a proposed effective date of 
January 1, 2025 (therefore applicable to data submitted for calendar 
year/reporting year 2024, i.e., RY2024),\8\ would maintain long-term 
consistency between the GHGRP GWPs and the GWPs used for the Inventory, 
which are scheduled to change from the AR4 GWPs to the AR5 GWPs for the 
1990-2022 Inventory.\9\
---------------------------------------------------------------------------

    \8\ As discussed in section III.A.2 of the preamble, current 40 
CFR 98.3(k) provides that facilities or suppliers that first become 
subject to any subpart of part 98 solely due to an amendment to 
Table A-1 are not required to submit an annual GHG report (or, for 
facilities or suppliers that already report under the GHGRP, a 
report for the subpart to which they are newly subject) for the 
reporting year during which the change in GWPs is published. 
However, they are required to begin monitoring their emissions and 
supplies for the subpart(s) to which they are newly subject 
beginning on January 1 of the year following publication of the 
amendment to Table A-1.
    \9\ Due to the time required to complete this proposed rule to 
adopt the AR5 GWPs, if this proposed rule is finalized, emissions 
from at least two years, 2022 and 2023, would be weighted by 
different sets of GWPs under part 98 and the Inventory.
---------------------------------------------------------------------------

    The Inventory is a comprehensive assessment of U.S. GHG emissions 
based on national-level data and follows the reporting guidelines set 
by the UNFCCC.\10\ The United States is a party to the UNFCCC and 
submits the Inventory to the Secretariat of the UNFCCC as part of 
annual obligations under the treaty. To ensure consistency and 
comparability with national inventory data submitted by other UNFCCC 
Parties, the Inventory submitted to the UNFCCC uses internationally 
accepted methods and common reporting metrics agreed upon by the 
Parties (including the United States) to develop and characterize 
emission estimates.
---------------------------------------------------------------------------

    \10\ See Articles 4 and 12 of the Convention on Climate Change. 
Parties to the Convention, by ratifying, ``shall develop, 
periodically update, publish and make available * * * national 
inventories of anthropogenic emissions by sources and removals by 
sinks of all greenhouse gases not controlled by the Montreal 
Protocol, using comparable methodologies * * *.'' See https://unfccc.int/resource/docs/convkp/conveng.pdf.
---------------------------------------------------------------------------

    As described in the preamble of the 2009 Proposed Rule, the GHGRP 
is intended to gather information that is relevant to the EPA's 
carrying out a wide variety of CAA provisions, with the goal of 
supplementing and complementing existing U.S. Government programs 
related to climate policy and research, including the Inventory 
submitted to the UNFCCC. The GHGRP provides data that can inform 
analysis of potential U.S. climate policies and programs, which is also 
one of the uses for the data developed for the Inventory. The GHGRP 
complements the Inventory and other U.S. programs by providing data 
from certain individual facilities and suppliers, generally those above 
certain thresholds. Collected facility, unit, and process-level GHG 
data from the GHGRP are also used to develop and confirm the national 
statistics and emission estimates presented in the Inventory, which are 
calculated using aggregated national data.
    Throughout the development and implementation of the GHG Reporting 
Rule, the EPA has proposed and finalized calculation methodologies and 
reporting metrics that were consistent with the international reporting 
standards under the UNFCCC. This approach has allowed the data 
collected under the GHGRP to be easily compared to the data in the 
Inventory and to data from other national and international programs, 
facilitating the analysis of potential U.S. climate policies and 
programs. Specifically, in the 2009 Final Rule, the EPA generally 
promulgated

[[Page 32859]]

GWP values published in the IPCC Second Assessment Report \11\ 
(hereafter referred to as ``SAR GWP values'') to convert mass emissions 
(or supplies) of each GHG into a common unit of measure, 
CO2e, for final reporting. Although the IPCC published AR4 
prior to publication of the 2009 Final Rule, the UNFCCC continued to 
require the use of SAR GWP values for reporting in the Inventory at the 
time the rule was promulgated, and up until 2014.\12\ In the 2013 Final 
Rule, the EPA revised the GHGRP's GWP values, after consideration of a 
UNFCCC decision reached by UNFCCC member parties and published on March 
15, 2012, to require countries submitting an annual inventory report in 
2015 and beyond to use AR4 GWP values.\13\ The 2013 Final Rule adopted 
the IPCC AR4 GWP values in Table A-1, in part in order to maintain 
comparability and consistency with the updated international reporting 
standards under the UNFCCC and the revised requirements for official 
emission estimates to be reported by the United States and other 
parties. Following the 2013 Final Rule, the EPA published a separate 
rule to add GWPs to Table A-1 for a number of F-GHGs and fluorinated 
heat transfer fluids (F-HTFs) for which GWPs were not provided in AR4 
or previous scientific assessments (79 FR 73750, December 11, 2014, 
hereinafter referred to as the ``2014 Fluorinated GHG Final 
Rule'').\14\ The 2014 Fluorinated GHG Final Rule included chemical-
specific GWPs primarily drawn from AR5, as well as default GWPs 
intended for F-GHGs and F-HTFs for which peer-reviewed GWPs were not 
available in AR4, AR5, or other sources. The default GWPs were 
calculated and applied to 12 fluorinated GHG groups composed of 
compounds with similar chemical structures, atmospheric lifetimes, and 
GWPs, and were based on the average GWPs of the chemically similar 
fluorinated GHGs for which a chemical-specific GWP was available in 
Table A-1 or AR5. As such, the changes from the 2014 Fluorinated GHG 
Final Rule reflected the latest scientific consensus regarding F-GHGs 
that did not have GWPs in earlier assessments and expanded the number 
of compounds reflected in Table A-1, resulting in more accurate and 
complete estimates of GHG emissions. At the same time, the 2014 
Fluorinated GHG Final Rule maintained consistency between the GHGRP and 
the Inventory by retaining the AR4 GWP values where those were 
available.
---------------------------------------------------------------------------

    \11\ IPCC Second Assessment Report (SAR), 1995. Climate Change 
1995: The Science of Climate Change, Contribution of Working Group I 
to the Second Assessment Report of the Intergovernmental Panel on 
Climate Change [Houghton, J.T.; Meira Filho, L.G.; Callander, B.A.; 
Harris, N.; Kattenberg, A.; Maskell, K. (eds.)., Cambridge 
University Press, Cambridge, United Kingdom, 572 pp.
    \12\ As discussed further in this section of this preamble, the 
EPA did adopt AR4 values in 2009 for GHGs that did not have SAR GWP 
values because doing so increased the accuracy and completeness of 
the GWP-weighted emissions calculated and reported under the GHGRP 
without introducing any inconsistency with UNFCCC reporting.
    \13\ Refer to https://unfccc.int/. See Decision 15/CP.17, 
Revision of the UNFCCC reporting guidelines on annual inventories 
for Parties included in Annex I to the Convention.
    \14\ As noted in the 2014 Fluorinated GHG Final Rule, the 
addition of GWPs for compounds that did not have GWPs in AR4 was 
consistent with the UNFCCC Reporting Guidelines, which ``strongly 
encourage'' Annex I Parties ``to also report emissions and removals 
of additional GHGs'' (i.e., GHGs whose GWPs are not included in 
AR4).
---------------------------------------------------------------------------

    In the 2013 Final Rule, we noted ``the EPA may consider adoption of 
AR5 GWPs or other GWP values for compounds currently listed in Table A-
1 (i.e., compounds for which AR4 GWPs are currently listed in Table A-
1) if these values are adopted by the UNFCCC and the global community'' 
(78 FR 71912; November 29, 2013).
    In December 2018, the Parties to the UNFCCC agreed to require use 
of the 100-year time-horizon GWP values from AR5 in annual inventory 
reports submitted in 2024 and future years.\15\ In November 2021, the 
parties clarified which of the two sets of GWPs in AR5 were to be used: 
those in Table 8.A.1.\16\ Accordingly, the United States has an annual 
commitment to submit the Inventory for 2024 and subsequent years using 
the revised AR5 GWP values in Table 8.A.1. The Inventory for 2024 will 
contain national-level estimates of emissions for each year from 1990-
2022. In order to ensure that the GHGRP continues to rely on recent 
scientific data and uses methods consistent with UNFCCC guidelines, as 
the EPA intended in the development of the 2009 Final Rule and in 
revisions to the GHGRP since then, we are proposing to revise the GWP 
values in Table A-1 of part 98 to reflect updated AR5 GWP values, which 
would apply to annual reports beginning with RY2024. The proposed 
changes would continue to keep the reporting metrics in part 98 
consistent with the updated international reporting standards followed 
by the Inventory and allow the GHGRP to continue to provide the 
additional benefit of complementing and informing the Inventory 
submitted to the UNFCCC.\17\
---------------------------------------------------------------------------

    \15\ Refer to https://unfccc.int/. See Annex to Decision 18/
CMA.1, paragraph 37. ``Each Party shall use the 100-year time-
horizon global warming potential (GWP) values from the IPCC Fifth 
Assessment Report, or 100-year time-horizon GWP values from a 
subsequent IPCC assessment report as agreed upon by the [Conference 
of the Parties serving as the meeting of the Parties to the Paris 
Agreement] (CMA), to report aggregate emissions and removals of 
GHGs, expressed in CO2 eq.''
    \16\ Decision 5/CMA.3, paragraph 25 reads ``the 100-year time-
horizon global warming potential values referred to in decision 18/
CMA.1, annex, paragraph 37, shall be those listed in Table 8.A.1 of 
the Fifth Assessment Report of the Intergovernmental Panel on 
Climate Change, excluding the value for fossil methane.'' See 
https://unfccc.int/sites/default/files/resource/CMA2021_L10a2E.pdf.
    \17\ The updates to Table A-1 would not affect the GWP-weighted, 
CO2-equivalent totals certified by facilities or 
suppliers in their annual reports for reporting years before RY2023. 
However, to ensure that GWP-weighted totals are used in analyses and 
displayed to the public in a consistent manner from RY2010/2011 
through RY2023 and later years, the updated GWPs would be applied to 
the entire time series in analyses and in EPA's Facility Level 
Information on GreenHouse gases Tool (FLIGHT) at https://ghgdata.epa.gov/ghgp/main.do. This approach is consistent with the 
approach taken for previous updates of Table A-1. See, e.g., 78 FR 
71937.
---------------------------------------------------------------------------

    For GHGs that do not have GWPs in AR5 but do have GWPs in AR6, we 
are proposing to adopt the AR6 GWPs. Currently, default GWPs are 
applied to these compounds based on the fluorinated GHG group to which 
they belong. While the default GWPs are, on average, expected to be 
reasonably accurate across the fluorinated GHGs within a fluorinated 
GHG group, the AR6 GWP for an individual compound is expected to be 
more accurate for that compound than the corresponding default GWP. 
This is because the AR6 GWP takes into consideration the radiative 
efficiency and atmospheric lifetime of the individual compound. Thus, 
adopting the AR6 GWPs for GHGs that do not have GWPs in AR5 is expected 
to improve the accuracy with which the atmospheric impacts of the gases 
are reflected in annual reports, threshold determinations, and other 
calculations. The specific changes that we are proposing to Table A-1 
and the rationale for the GWPs proposed to be adopted are described 
further in section III.A.1 of this preamble.
    We recognize that some other EPA programs use the GWP values in 
Table A-1 to determine the applicability of their individual program 
requirements to direct emitters or suppliers above certain thresholds. 
Issues related to other EPA programs that use the GHGRP GWP values in 
Table A-1 are outside the scope of this proposed rule. To the extent 
that a Table A-1 amendment raises such questions or concerns, please 
work with the respective EPA office for that other EPA program. We also 
recognize that non-EPA programs use the GWP values in Table A-1 to part 
98. Issues related to non-EPA programs that use the GHGRP GWP values in

[[Page 32860]]

Table A-1 are also outside the scope of this proposed rule. As 
explained in this section above, this rulemaking proposes to update 
GWPs for the GHGRP consistent with recent science and the intent the 
EPA expressed at the time the GHGRP was first promulgated. Thus, under 
this supplemental proposal, we are seeking comments on the specific GWP 
values proposed in this action for the GHGRP.

B. Revisions To Expand Source Categories and Address Potential Gaps in 
Reporting of Emissions Data for Specific Sectors

    In the 2022 Data Quality Improvements Proposal, the Agency stated 
that it was considering future revisions to the GHG Reporting Rule to 
potentially expand existing source categories or develop new source 
categories that would add calculation, monitoring, reporting, and 
recordkeeping requirements for certain sectors of the economy. 
Specifically, the 2022 Data Quality Improvements Proposal solicited 
comment on the potential addition of GHG reporting requirements related 
to energy consumption; CO2 utilization; ceramics production; 
calcium carbide production; caprolactam, glyoxal, and glyoxylic acid 
production; and coke calcining. The EPA solicited comment on these six 
source categories where we identified that additional data from these 
emission sources would help eliminate data gaps, improve the coverage 
of the GHGRP, and better inform future EPA policy and programs under 
the CAA. We identified cases where certain emission sources may 
potentially contribute significant GHG emissions that are not currently 
reported, or where facilities representative of these source categories 
may currently report under another part 98 source category using 
methodologies that may not provide complete or accurate emissions. We 
also identified where the inclusion of potential source categories 
would improve the completeness of the emissions estimates presented in 
the Inventory, such as collection of data on ceramics production, 
calcium carbide production, and caprolactam, glyoxal, and glyoxylic 
acid production. The 2022 Data Quality Improvements Proposal also 
included similar amendments to add reporting of new emissions or 
emissions sources for certain existing sectors to address potential 
gaps in reporting, e.g., where we proposed to add requirements for the 
monitoring, calculation, and reporting of F-GHGs other than 
SF6 and perfluorocarbons (PFCs) under subpart DD (Electrical 
Equipment and Distribution Equipment Use) to account for the 
introduction of alternative technologies and replacements for 
SF6, including fluorinated gas mixtures such as 
fluoronitriles or fluoroketones mixed with carrier gases, as a 
replacement for dielectric insulation gases (87 FR 37000; June 21, 
2022).
    Following the June 21, 2022 request for comment, the EPA has 
reviewed information provided from stakeholders and considered 
additional data to further support the development of reporting 
requirements for five source categories. After that consideration, we 
are proposing to add annual reporting requirements for greenhouse gases 
from the following sources categories in new subparts to part 98 as 
follows: subpart B (Energy Consumption); subpart WW (Coke Calciners); 
subpart XX (Calcium Carbide Production); subpart YY (Caprolactam, 
Glyoxal, and Glyoxylic Acid Production); and subpart ZZ (Ceramics 
Production). As explained in the 2022 Data Quality Improvements 
Proposal, the collection of such data would continue to inform, and are 
relevant to, the EPA's carrying out a wide variety of CAA provisions. 
Additional information on the data and rationale informing the proposed 
definition of the source category, reporting thresholds, calculation, 
monitoring, quality assurance, missing data, verification, and data 
reporting and recordkeeping requirements for these five proposed new 
source categories are included in section IV of this preamble.
    The EPA is also proposing amendments that would expand the coverage 
of the GHGRP for one subpart not included in the 2022 Data Quality 
Improvements Proposal. Since the publication of the proposed rule, we 
have identified a gap in coverage for certain emission sources, where 
revisions to existing applicability and reporting requirements would 
help the EPA to better understand and track emissions in specific 
sectors and better inform future EPA policy and programs under the CAA. 
In this supplemental proposal, we are proposing to amend the 
applicability of subpart P (Hydrogen Production) to expand reporting to 
include all hydrogen plants. The current source category definition in 
subpart P is limited to merchant hydrogen production facilities, 
including facilities that sell hydrogen and that may be located within 
another facility if they are not owned by, or under the direct control 
of, the other facility's owner and operator. The current definition 
inadvertently excludes non-merchant hydrogen production facilities 
(i.e., facilities that do not sell hydrogen or captive hydrogen 
plants). Although some non-merchant hydrogen production facilities may 
report under subpart Y (Petroleum Refineries), the EPA has identified 
that there may be other non-merchant or captive hydrogen plants whose 
emissions are not currently captured by part 98. The proposed 
amendments would address this gap in reporting and allow the EPA to 
better understand and track emissions from these facilities, which 
would better inform future EPA policy and programs under the CAA. 
Section III.G of this preamble provides additional information on the 
proposed amendments.
    Additionally, we are proposing to amend subpart HH (Municipal Solid 
Waste Landfills) to expand reporting to account for methane emissions 
from large releases that are currently not quantified under the GHGRP. 
Specifically, we are proposing to revise calculation methodologies in 
subpart HH to account for cover system leaks to better account for 
large release events. The EPA has identified recent studies indicating 
that methane emissions from landfills may be considerably higher than 
what is currently reported to part 98 due to emissions from poorly 
operating gas collection systems or destruction devices and cover 
system leaks. We are proposing to revise the monitoring and calculation 
methodologies in subpart HH to account for these scenarios. 
Specifically, we note that owners or operators of landfills with gas 
collection systems subject to the control requirements in the new 
source performance standards (NSPS) as implemented in 40 CFR part 60, 
subparts WWW or XXX, emission guidelines (EG) as implemented in 40 CFR 
part 60, subparts Cc or Cf, or the Federal plan as implemented in 40 
CFR part 62, subparts GGG and OOO are required to conduct surface 
methane concentration measurements to ensure proper operation of the 
gas collection system. We are proposing that subpart HH reporters with 
landfills for which surface methane concentration measurements are 
conducted under the NSPS, EG, or Federal plan would estimate emissions 
for cover leaks based on a count of the number of exceedances 
identified during the surface measurement period and the proposed 
revised equations HH-6, HH-7, and HH-8 to adjust reported methane 
emissions to account for these exceedances. Subpart HH reporters with 
landfills with gas collection systems that are not required to conduct 
surface methane concentration measurements under the NSPS, EG, or 
Federal plan may elect to conduct these

[[Page 32861]]

measurements according to the method provided in the proposal and 
adjust the emissions based on the number of exceedances identified. If 
such subpart HH reporters do not elect to conduct such measurements, 
the EPA is proposing that reporters with these landfills would use a 
surface methane collection efficiency that is 10 percent lower than for 
landfills with gas collection systems that are conducting surface 
methane concentration measurements. These proposed amendments would 
address a potentially large subset of emissions that are currently 
omitted in reporting and improve the EPA's understanding of emissions 
from these facilities. The improved data would subsequently better 
inform Agency policies and programs under the CAA.

C. Improvements to Existing Emissions Estimation Methodologies

    The EPA is proposing several additional revisions to modify 
calculation equations to incorporate refinements to methodologies based 
on an improved understanding of emission sources. In the 2022 Data 
Quality Improvements Proposal, we identified amendments to emission 
estimation methodologies where there are discrepancies between 
assumptions in the current emission estimation methods and the 
processes or activities conducted at specific facilities, or where we 
identified more recent studies on GHG emissions or formation that 
reflect updates to scientific understanding of GHG emissions sources. 
We proposed changes that are intended to improve the quality and 
accuracy of the data collected under the GHGRP, increase our 
understanding of the relative distribution of GHGs that are emitted, 
and better reflect GHG end uses or where GHGs are bound in products.
    Since the development of the 2022 Data Quality Improvements 
Proposal, we have identified several calculation provisions of part 98 
that would benefit from amendments that update, clarify, or improve the 
calculation methodology. For example, we are proposing to revise 
calculation methodologies in subpart HH (Municipal Solid Waste 
Landfills) to more clearly delineate the calculations needed when there 
are multiple landfill gas recovery systems in place. During 
verification of subpart HH reports, we identified issues in how the 
electronic Greenhouse Gas Reporting Tool (e-GGRT) system calculates 
emissions when multiple control devices are associated with a single 
measurement location and when multiple measurement locations may be 
used for a single recovery system. If a single recovery system is used, 
but an additional measurement location is added to the system in mid-
year, the ``fRec,c'' term associated with the new 
measurement location (currently, the fraction of annual operating hours 
the associated recovery system was operating) is calculated as 0.5 and 
assumes the recovery system operated only half the year. The current 
equations (equations HH-7 and HH-8) are set up with the assumption that 
each measurement location is associated with a single recovery system, 
however this is not always the case. We also found errors in 
determining the ``fDest'' term (fraction of annual hours the 
destruction device was operating) in equations HH-6 and HH-8 when 
multiple destruction devices are used for a single measurement 
location. If, for example, a measurement location operates continuously 
(8,760 hours per year), with flow from the measurement location 
directed to an engine (approximately 8,400 hours per year), diverted to 
a flare when the engine is down for maintenance (approximately 360 
hours per year), and if the control devices were operating at all times 
gas was directed to the device, the fDest term should be 1 
for each device. However, the fDest term is often calculated 
as the average of 0.959 (8400/8760) and 0.041 (360/8760), resulting in 
a value of 0.5. Therefore, we are proposing revisions to equations HH-
6, HH-7, and HH-8 to more clearly define these terms, as well as to 
adjust the equations to be able to account for landfills with multiple 
gas collection systems or for a single gas collection system with 
multiple measurement locations. These proposed revisions would improve 
the quality and accuracy of the data collected under subpart HH.
    We are proposing to clarify the calculation methodology for 
reporters whose hydrogen unit routes process emissions to a stack with 
CEMS, but fuel combustion emissions from the unit are routed to a 
different stack which is not monitored with a CEMS. The proposed rule 
would require reporters to calculate the CO2 emissions from 
fuel combustion from the hydrogen process unit using the mass balance 
equations in subpart P (Hydrogen Production) considering only fuel 
inputs and report the sum of these emissions plus the process 
CO2 emissions measured by the CEMS. The proposed amendments 
would clarify the reporting requirements for cases where hydrogen 
production process and combustion emissions are emitted through 
separate stacks and the process emissions are measured with a CEMS, but 
the combustion emissions are not.
    We are also proposing to revise subpart AA (Pulp and Paper 
Manufacturing) to add a calculation methodology for biogenic 
CO2 emissions from the combustion of biomass other than 
spent liquor solids. The rule currently only includes methodologies to 
calculate CO2, CH4, and N2O emissions 
from the combustion of fossil fuels, and CH4, 
N2O, and biogenic CO2 emissions from the 
combustion of spent liquor solids. Therefore, we are proposing to add 
methodologies to calculate CH4, N2O, and biogenic 
CO2 emissions from the combustion of biomass fuels other 
than spent liquor solids, as well as the combustion of biomass other 
than spent liquor solids with other fuels. The proposed amendments 
would provide a more accurate accounting of CO2 and biogenic 
CO2 for subpart AA units in this situation. See section 
III.I of this preamble for additional information.

D. Revisions To Reporting Requirements To Improve Verification and the 
Accuracy of the Data Collected

    In the 2022 Data Quality Improvements Proposal, the EPA proposed 
several revisions to existing reporting requirements to improve the 
quality of the data that are currently reported, to collect more useful 
data to improve verification of reported data, to better characterize 
U.S. GHG emissions and trends, and to extend the usefulness of the 
GHGRP to inform and improve the EPA's ability to carry out other CAA 
programs. See section II.A.4 of the 2022 Data Quality Improvements 
Proposal for additional information. In this supplemental proposal, the 
EPA is proposing new revisions to reporting requirements where we have 
identified additional data that would further support these goals and 
improve the quality of the GHGRP.
    In some cases, the EPA is proposing to collect additional 
information that would better inform the development of GHG policies 
and programs by providing information on GHG uses and their relative 
importance in specific sectors. For example, we are proposing to add 
reporting requirements to subpart OO (Suppliers of Industrial 
Greenhouse Gases) to require industrial gas suppliers to identify the 
end-use applications for which F-HTFs are used and the approximate 
quantities used in each application. The EPA recently proposed a 
similar requirement for N2O, PFCs, and SF6 in the 
2022 Data Quality Improvements Proposal; this supplemental notification 
extends the proposed revisions to include F-HTFs

[[Page 32862]]

to better account for emissions from the use and distribution of F-HTFs 
which are not otherwise accounted for in the current source categories 
under part 98. See section III.K of this preamble for additional 
information.
    The proposed revisions would also provide more useful data that 
would improve verification of reported data. For example, we are 
proposing to revise the existing reporting and recordkeeping 
requirements in subpart N (Glass Production) for both facilities using 
continuous electronic monitoring systems (CEMS) and non-CEMS facilities 
(i.e., facilities that use a mass balance calculation method) to 
require reporting and recordkeeping of the annual amounts of recycled 
scrap glass (cullet) used as a raw material. The EPA is proposing to 
collect this information because the use of cullet, which contains no 
carbonates that can be converted to CO2 emissions, can lead 
to reductions in emissions from the production of various glass types. 
The proposed data element would help to inform the EPA's understanding 
of the variations and differences in emissions estimates within this 
sector, improve understanding of industry trends, and improve 
verification of collected data. As discussed in section II of this 
preamble and in prior amendments, the GHGRP is intended to supplement 
and complement other EPA programs by advancing the understanding of 
emission processes and monitoring methodologies for particular source 
categories or sectors.
    Similarly, for subpart Y (Petroleum Refineries), we are proposing 
to include a requirement to report the capacity of each asphalt blowing 
unit. Although subpart Y currently includes unit-level capacity 
reporting requirements for other emission units (e.g., catalytic 
cracking units, fluid coking units, sulfur recovery plants, coke 
calcining units, delayed coking units), the EPA lacks data on the 
capacities of asphalt blowing units. Individual unit information allows 
the EPA to aggregate emissions according to unit type and size and 
provides a better understanding of the emissions from specific unit 
types. Therefore, the proposed revisions to subpart Y would improve 
emissions analysis and verification for these units.
    The proposed changes to reporting requirements in this supplemental 
notification would further enable the EPA to obtain data that is of 
sufficient quality that it can be used to support a range of future 
climate change policies and regulations, in keeping with the EPA's CAA 
section 114 authorities.

E. Technical Amendments, Clarifications, and Corrections

    This supplemental proposal includes several other proposed 
technical amendments, corrections, and clarifications that have been 
identified following the 2022 Data Quality Improvements Proposal and 
that would improve understanding of the rule. The proposed amendments 
include revisions that better reflect the EPA's intent and include 
editorial changes, revisions that resolve uncertainties in the 
regulatory text, and amendments that would increase the likelihood that 
reporters will submit accurate reports. Some of the proposed changes 
result from consideration of questions raised by reporters through the 
GHGRP Help Desk or e-GGRT. For example, we are proposing to add a 
definition for the term ``offshore'' to subpart RR (Geologic 
Sequestration of Carbon Dioxide) to clarify questions raised by 
stakeholders regarding the applicability of subpart RR to specific 
offshore geologic sequestration activities. Although the EPA previously 
noted that the source category covers both onshore and offshore 
injection of CO2 in its 2010 final rule (75 FR 75060, 
December 1, 2010), we are aware that we have not previously provided a 
definition for the term ``offshore.'' The proposed definition would 
clarify the boundaries of injection activities that are currently 
covered under the source category and improve reporting to the GHGRP.
    We are proposing similar revisions to clarify definitions. For 
example, we are proposing to revise subpart A (General Provisions) to 
amend the definition of the term ``Bulk'' to address questions raised 
by certain suppliers as to whether imports or exports of GHGs in small 
containers are reportable to the GHGRP. The proposed revision is a 
clarification of the existing definition and would provide clarity 
regarding the size of containers that should be included in the 
reported supply.
    Finally, the EPA is proposing minor changes such as edits to fix 
typos, minor clarifications such as adding a missing word, and 
harmonizing changes to match other proposed revisions. For example, we 
are clarifying the 2022 Data Quality Improvements Proposal regarding 
proposed destruction and removal efficiency (DRE) and gamma factors in 
Tables I-16 and I-18 of subpart I (Electronics Manufacturing), 
respectively, to correct inadvertent errors in the relevant proposed 
regulatory text. We are also proposing to correct subpart AA (Pulp and 
Paper Manufacturing) at 40 CFR 98.276 to correct a reporting 
requirement that incorrectly refers to biogenic CH4 and 
N2O. All proposed minor corrections and clarifications are 
reflected in the draft proposed redline regulatory text in the docket 
for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).

III. Proposed Amendments to Part 98

    This section summarizes the specific substantive amendments 
proposed for each subpart, as generally described in section II of this 
preamble. The impacts of the proposed revisions are summarized in 
section VII of this preamble. A full discussion of the cost impacts for 
the proposed revisions may be found in the memorandum, Assessment of 
Burden Impacts for Proposed Supplemental Revisions for the Greenhouse 
Gas Reporting Rule, available in the docket for this rulemaking (Docket 
Id. No. EPA-HQ-OAR-2019-0424).

A. Subpart A--General Provisions

1. Proposed Revisions to Global Warming Potentials in Table A-1
    For the reasons described here and in section II.A of this 
preamble, we are proposing to revise Table A-1 to subpart A of part 98 
(General Provisions) to update the GWP values of certain GHGs to 
reflect GWPs from Table 8.A.1 of AR5 and, for certain GHGs that do not 
have GWPs listed in AR5, to adopt GWP values from AR6. We are also 
proposing to add default GWPs for two new fluorinated GHG groups, to 
slightly modify an existing GHG group, and to update the default GWPs 
for all the existing fluorinated GHG groups. The chemical-specific GWP 
values currently in Table A-1 are drawn both from AR4 and, for multiple 
GHGs that do not have GWPs listed in AR4, from AR5. The current GWPs 
drawn from AR4 would be updated to values from AR5, while the current 
GWPs drawn from AR5 would remain the same. AR6 GWPs would be added for 
GHGs that do not have GWPs listed in AR5. Under the current rule, 
default GWPs are applied to GHGs that do not have GWPs listed in AR5 
based on the fluorinated GHG group to which they belong.
    By proposing (1) to adopt (or maintain) AR5 GWPs for GHGs that have 
GWPs listed in AR5, and (2) to adopt AR6 GWPs for GHGs that do not have 
GWPs listed in AR5, we are taking the approach to establishing and 
updating GWPs that we have taken since the beginning of the GHGRP. That 
is, for GHGs with GWPs listed in the IPCC Assessment Report that the 
parties to the UNFCCC have agreed to use as the source of GWPs, we are 
proposing to use the GWPs in the agreed-upon

[[Page 32863]]

Assessment Report to maintain consistency with the Inventory and other 
analyses. For GHGs that do not have GWPs listed in the agreed-upon 
Assessment Report, but that do have GWPs listed in a more recent IPCC 
Assessment Report, we are proposing to use the GWPs in the most recent 
report to increase the accuracy of the calculations and reporting under 
part 98. Where the UNFCCC-referenced Assessment Report does not include 
a GWP for a GHG, adopting the GWP from a more recent Assessment Report 
does not introduce inconsistency with Inventory reporting. In fact, as 
noted in the 2014 Fluorinated GHG Final Rule updating GWPs, adopting 
GWPs in the most recent Scientific Assessment Report would facilitate 
U.S. reporting under the UNFCCC Reporting Guidelines, which state: 
``Annex I Parties are strongly encouraged to also report emissions and 
removals of additional GHGs, such as hydrofluoroethers (HFEs), 
perfluoropolyethers (PFPEs), and other gases for which 100-year global 
warming potential values are available from the IPCC but have not yet 
been adopted by the [Conference of the Parties to the UNFCCC].'' \18\
---------------------------------------------------------------------------

    \18\ See Decision 24, CP.19 at https://unfccc.int/resource/docs/2013/cop19/eng/10a03.pdf.
---------------------------------------------------------------------------

    Specifically, the first set of GWPs adopted under part 98 in 2009 
consisted of (1) GWPs from the SAR for GHGs that had GWPs listed in the 
SAR (consistent with the UNFCCC reporting guidelines in effect at the 
time) and (2) GWPs from AR4 (the most recent IPCC Assessment Report 
available at the time) for GHGs that did not have GWPs listed in the 
SAR.\19\ The second set of GWPs adopted under part 98, in 2013 and 
2014, consisted of (1) GWPs from AR4 (consistent with the UNFCCC 
reporting guidelines going into effect at the time), and (2) GWPs from 
AR5 (the most recent IPCC Assessment Report available at the time) for 
GHGs that did not have GWPs listed in AR4.
---------------------------------------------------------------------------

    \19\ Mandatory Reporting of Greenhouse Gases, proposed pule 
published on April 10, 2009 (74 FR 16453).
---------------------------------------------------------------------------

    Two decisions by the parties to the UNFCCC require countries to use 
the AR5 values from Table 8.A.1 for their Inventories and other 
reporting, beginning with the reports due in 2024. Decision 18/CMA.1, 
annex, paragraph 37 (December, 2018) reads, ``Each Party shall use the 
100-year time-horizon global warming potential (GWP) values from the 
IPCC Fifth Assessment Report, or 100-year time-horizon GWP values from 
a subsequent IPCC assessment report as agreed upon by the [Conference 
of the Parties serving as the meeting of the Parties to the Paris 
Agreement] (CMA), to report aggregate emissions and removals of GHGs, 
expressed in CO2 eq.'' Decision 5/CMA.3, paragraph 25 
(November, 2021) reads, ``the 100-year time-horizon global warming 
potential values referred to in decision 18/CMA.1, annex, paragraph 37, 
shall be those listed in Table 8.A.1 of the Fifth Assessment Report of 
the Intergovernmental Panel on Climate Change, excluding the value for 
fossil methane.'' \20\
---------------------------------------------------------------------------

    \20\ Refer to https://unfccc.int/.
---------------------------------------------------------------------------

    The second decision, specifying that Parties must use the GWP 
values in Table 8.A.1 of AR5, excluding the value for ``fossil 
methane,'' was important for two reasons. First, AR5 includes two 
tables of GWPs. Table 8.A.1 includes GWPs that reflect the climate-
carbon feedbacks of CO2 but not the GHG whose GWP is being 
evaluated, while the other table includes GWPs that reflect the 
climate-carbon feedbacks of both CO2 and the GHG whose GWP 
is being evaluated. (The same GHGs are in both tables.) Second, for 
methane, AR5 includes two GWP values in each table. In each table, one 
methane GWP accounts for the influence of CO2 produced by 
the oxidation of methane (the value for ``fossil'' methane) and one 
methane GWP does not account for the influence of CO2 
produced by the oxidation of methane.
    Consistent with the 2021 UNFCCC decision, we are proposing to use 
(1) for GHGs with GWPs in AR5, the AR5 GWP values in Table 8.A.1 (that 
reflect the climate-carbon feedbacks of CO2 but not the GHG 
whose GWP is being evaluated), and (2) for methane, the GWP that is not 
the GWP for fossil methane in Table 8.A.1 (i.e., the GWP for methane 
that does not reflect either the climate-carbon feedbacks for methane 
or the atmospheric CO2 that would result from the oxidation 
of methane in the atmosphere). In addition to maintaining consistency 
with recent UNFCCC decisions, using a single GWP for methane that does 
not reflect the CO2 oxidation product would be consistent 
with prior IPCC practice, avoid the potential for double counting, and 
reduce complexity in accounting.\21\
---------------------------------------------------------------------------

    \21\ Paragraph 52 of the annex to 18/CMA.1 encourages parties to 
the UNFCCC to report indirect CO2 emissions separately: 
``Each Party may report indirect CO2 from the atmospheric oxidation 
of CH4, CO and NMVOCs. For Parties that decide to report indirect 
CO2, the national totals shall be presented with and without 
indirect CO2.'' Refer to https://unfccc.int/. Using the 
fossil methane GWP, which incorporates the impact of the indirect 
CO2, would double count those emissions.
---------------------------------------------------------------------------

    As noted above, we are also proposing to adopt AR6 GWPs for 31 GHGs 
that have GWPs listed in AR6 but not AR5. All of these are fluorinated 
GHGs. Currently, default GWPs based on each GHG's fluorinated GHG group 
are applied to these GHGs. Each default value reflects the average of 
the known GWPs of the GHGs in a group of chemically similar fluorinated 
GHGs. While the default value is expected to be an unbiased estimate of 
the GWPs of other fluorinated GHGs in that group, it is not expected to 
be as accurate as a chemical-specific GWP for any given GHG, which 
reflects the radiative efficiency and atmospheric lifetime of that GHG. 
The chemical-specific GWPs in each group vary over a range. For 
example, the chemical-specific AR5 GWPs in each group show relative 
standard deviations between 30 and 170 percent, depending on the group. 
Thus, using chemical-specific GWPs instead of default values would 
better reflect the atmospheric impacts of these gases.
    The AR6 GWPs reflect the climate-carbon feedbacks for the GHG whose 
GWP is being evaluated, while the AR5 GWPs that we are proposing to 
adopt (from Table 8.A.1) do not. GWPs that reflect the climate-carbon 
feedbacks for the GHG whose GWP is being evaluated are slightly larger 
than GWPs that do not. Thus, this difference could potentially result 
in over-weighting the atmospheric impacts of GHGs whose GWPs are drawn 
from AR6 relative to GHGs whose GWPs are drawn from Table 8.A.1 of AR5. 
However, our analysis indicates that using chemical-specific GWPs will 
lead to more accurate estimates, even if there are some inconsistencies 
among those GWPs.\22\ In AR5, reflecting climate-carbon feedbacks for 
the GHG whose GWP is being evaluated results in an increase in the 
evaluated GWP of 11 to 22 percent, with the higher fractional increase 
being associated with shorter-lived gases with lower GWPs.\23\ In 
contrast, using default GWPs based on AR5 rather than chemical-specific 
GWPs from AR6 would result in overestimating GWPs by as much as 3,000 
(equivalent to a relative error of 1,200 percent) and underestimating 
GWPs by as much as 5,000 (equivalent to a relative error of -35 
percent), with over- and underestimates averaging 1,200 and 950 
respectively (and relative

[[Page 32864]]

errors averaging 770 percent and -60 percent, respectively).\24\ 
Overall, these potential errors are substantially larger than the 
differences between GWPs that do and do not reflect climate-carbon 
feedbacks for the GHGs whose GWPs were evaluated.
---------------------------------------------------------------------------

    \22\ See the memorandum, Proposed Updates to Chemical-Specific 
and Default GWPs for the Greenhouse Gas Reporting Rule, available in 
the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-
0424).
    \23\ The authors of AR6 estimated smaller impacts from climate-
carbon feedbacks, meaning that the difference between accounting and 
not accounting for them is likely smaller than 11 to 22 percent. 
(See AR6, Chapter 7, page 121.)
    \24\ To avoid skewing the results with inconsequential 
differences, instances where the default GWP would differ from the 
chemical-specific GWP by less than one were excluded from the 
analysis. In all these cases, the default GWP was one.
---------------------------------------------------------------------------

    Table 2 of this preamble lists the GHGs whose GWP values we are 
proposing to revise, along with the GWP values currently listed in 
Table A-1 and the proposed revised GWP values based on either AR5 or 
AR6. Additional information regarding the EPA's rationale for the 
proposed GWPs may be found in the memorandum, Proposed Updates to 
Chemical-Specific and Default GWPs for the Greenhouse Gas Reporting 
Rule, in the docket for this rulemaking, (Docket Id. No. EPA-HQ-OAR-
2019-0424).

                   Table 2--Proposed Revised Chemical-Specific GWPs for Compounds in Table A-1
----------------------------------------------------------------------------------------------------------------
                                                                                  Current global     Proposed
                                                                                      warming     global warming
                Name                       CAS No.           Chemical formula     potential (100  potential (100
                                                                                       yr.)            yr.)
----------------------------------------------------------------------------------------------------------------
                                             Chemical-Specific GWPs
----------------------------------------------------------------------------------------------------------------
Carbon dioxide......................           124-38-9  CO2....................               1               1
Methane.............................            74-82-8  CH4....................              25              28
Nitrous oxide.......................         10024-97-2  N2O....................             298             265
----------------------------------------------------------------------------------------------------------------
                                             Fully Fluorinated GHGs
----------------------------------------------------------------------------------------------------------------
Sulfur hexafluoride.................          2551-62-4  SF6....................          22,800          23,500
Trifluoromethyl sulphur                        373-80-8  SF5CF3.................          17,700          17,400
 pentafluoride.
Nitrogen trifluoride................          7783-54-2  NF3....................          17,200          16,100
PFC-14 (Perfluoromethane)...........            75-73-0  CF4....................           7,390           6,630
PFC-116 (Perfluoroethane)...........            76-16-4  C2F6...................          12,200          11,100
PFC-218 (Perfluoropropane)..........            76-19-7  C3F8...................           8,830           8,900
Perfluorocyclopropane...............           931-91-9  c-C3F6.................          17,340           9,200
PFC-3-1-10 (Perfluorobutane)........           355-25-9  C4F10..................           8,860           9,200
PFC-318 (Perfluorocyclobutane)......           115-25-3  c-C4F8.................          10,300           9,540
Perfluorotetrahydrofuran............           773-14-8  c-C4F8O................        * 10,000          13,900
PFC-4-1-12 (Perfluoropentane).......           678-26-2  C5F12..................           9,160           8,550
PFC-5-1-14 (Perfluorohexane, FC-72).           355-42-0  C6F14..................           9,300           7,910
PFC-6-1-12..........................           335-57-9  C7F16; CF3(CF2)5CF3....           7,820           7,820
PFC-7-1-18..........................           307-34-6  C8F18; CF3(CF2)6CF3....           7,620           7,620
PFC-9-1-18..........................           306-94-5  C10F18.................           7,500           7,190
PFPMIE (HT-70)......................                 NA  CF3OCF(CF3)CF2OCF2OCF3.          10,300           9,710
Perfluorodecalin (cis)..............         60433-11-6  Z-C10F18...............           7,236           7,240
Perfluorodecalin (trans)............         60433-12-7  E-C10F18...............           6,288           6,290
Perfluorotriethylamine..............           359-70-6  N(C2F5)3...............        * 10,000          10,300
Perfluorotripropylamine.............           338-83-0  N(CF2CF2CF3)3..........        * 10,000           9,030
Perfluorotributylamine..............           311-89-7  N(CF2CF2CF2CF3)3.......        * 10,000           8,490
Perfluorotripentylamine.............           338-84-1  N(CF2CF2CF2CF2CF3)3....        * 10,000           7,260
----------------------------------------------------------------------------------------------------------------
                   Saturated Hydrofluorocarbons (HFCs) With Two or Fewer Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
(4s,5s)-1,1,2,2,3,3,4,5-                    158389-18-5  trans-cyc (-                    * 3,700             258
 octafluorocyclopentane.                                  CF2CF2CF2CHFCHF-).
HFC-23..............................            75-46-7  CHF3...................          14,800          12,400
HFC-32..............................            75-10-5  CH2F2..................             675             677
HFC-125.............................           354-33-6  C2HF5..................           3,500           3,170
HFC-134.............................           359-35-3  C2H2F4.................           1,100           1,120
HFC-134a............................           811-97-2  CH2FCF3................           1,430           1,300
HFC-227ca...........................          2252-84-8  CF3CF2CHF2.............           2,640           2,640
HFC-227ea...........................           431-89-0  C3HF7..................           3,220           3,350
HFC-236cb...........................           677-56-5  CH2FCF2CF3.............           1,340           1,210
HFC-236ea...........................           431-63-0  CHF2CHFCF3.............           1,370           1,330
HFC-236fa...........................           690-39-1  C3H2F6.................           9,810           8,060
HFC-329p............................           375-17-7  CHF2CF2CF2CF3..........           2,360           2,360
HFC-43-10mee........................        138495-42-8  CF3CFHCFHCF2CF3........           1,640           1,650
----------------------------------------------------------------------------------------------------------------
                  Saturated Hydrofluorocarbons (HFCs) With Three or More Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
1,1,2,2,3,3-hexafluorocyclopentane..        123768-18-3  cyc (-CF2CF2CF2CH2CH2-)           * 930             120
1,1,2,2,3,3,4-                               15290-77-4  cyc (-CF2CF2CF2CHFCH2-)           * 930             231
 heptafluorocyclopentane.
HFC-41..............................           593-53-3  CH3F...................              92             116
HFC-143.............................           430-66-0  C2H3F3.................             353             328
HFC-143a............................           420-46-2  C2H3F3.................           4,470           4,800
HFC-152.............................           624-72-6  CH2FCH2F...............              53              16
HFC-152a............................            75-37-6  CH3CHF2................             124             138
HFC-161.............................           353-36-6  CH3CH2F................              12               4

[[Page 32865]]

 
HFC-245ca...........................           679-86-7  C3H3F5.................             693             716
HFC-245cb...........................          1814-88-6  CF3CF2CH3..............           4,620           4,620
HFC-245ea...........................         24270-66-4  CHF2CHFCHF2............             235             235
HFC-245eb...........................           431-31-2  CH2FCHFCF3.............             290             290
HFC-245fa...........................           460-73-1  CHF2CH2CF3.............           1,030             858
HFC-263fb...........................           421-07-8  CH3CH2CF3..............              76              76
HFC-272ca...........................           420-45-1  CH3CF2CH3..............             144             144
HFC-365mfc..........................           406-58-6  CH3CF2CH2CF3...........             794             804
----------------------------------------------------------------------------------------------------------------
      Saturated Hydrofluoroethers (HFEs) and Hydrochlorofluoroethers (HCFEs) With One Carbon-Hydrogen Bond
----------------------------------------------------------------------------------------------------------------
HFE-125.............................          3822-68-2  CHF2OCF3...............          14,900          12,400
HFE-227ea...........................          2356-62-9  CF3CHFOCF3.............           1,540           6,450
HFE-329mcc2.........................        134769-21-4  CF3CF2OCF2CHF2.........             919           3,070
HFE-329me3..........................        428454-68-6  CF3CFHCF2OCF3..........           4,550           4,550
1,1,1,2,2,3,3-Heptafluoro-3-(1,2,2,2-         3330-15-2  CF3CF2CF2OCHFCF3.......           6,490           6,490
 tetrafluoroethoxy)-propane.
----------------------------------------------------------------------------------------------------------------
                             Saturated HFEs and HCFEs With Two Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
HFE-134 (HG-00).....................          1691-17-4  CHF2OCHF2..............           6,320           5,560
HFE-236ca...........................         32778-11-3  CHF2OCF2CHF2...........           4,240           4,240
HFE-236ca12 (HG-10).................         78522-47-1  CHF2OCF2OCHF2..........           2,800           5,350
HFE-236ea2 (Desflurane).............         57041-67-5  CHF2OCHFCF3............             989           1,790
HFE-236fa...........................         20193-67-3  CF3CH2OCF3.............             487             979
HFE-338mcf2.........................        156053-88-2  CF3CF2OCH2CF3..........             552             929
HFE-338mmz1.........................         26103-08-2  CHF2OCH(CF3)2..........             380           2,620
HFE-338pcc13 (HG-01)................        188690-78-0  CHF2OCF2CF2OCHF2.......           1,500           2,910
HFE-43-10pccc (H-Galden 1040x, HG-             E1730133  CHF2OCF2OC2F4OCHF2.....           1,870           2,820
 11).
HCFE-235ca2 (Enflurane).............         13838-16-9  CHF2OCF2CHFCl..........             583             583
HCFE-235da2 (Isoflurane)............         26675-46-7  CHF2OCHClCF3...........             350             491
HG-02...............................        205367-61-9  HF2C-(OCF2CF2)2-OCF2H..           3,825           2,730
HG-03...............................        173350-37-3  HF2C-(OCF2CF2)3-OCF2H..           3,670           2,850
HG-20...............................        249932-25-0  HF2C-(OCF2)2-OCF2H.....           5,300           5,300
HG-21...............................        249932-26-1  HF2C-OCF2CF2OCF2OCF2O-            3,890           3,890
                                                          CF2H.
HG-30...............................        188690-77-9  HF2C-(OCF2)3-OCF2H.....           7,330           7,330
1,1,3,3,4,4,6,6,7,7,9,9,10,10,12,12,        173350-38-4  HCF2O(CF2CF2O)4CF2H....           3,630           3,630
 13,13,15,15-eicosafluoro-
 2,5,8,11,14-Pentaoxapentadecane.
1,1,2-Trifluoro-2-(trifluoromethoxy)-        84011-06-3  CHF2CHFOCF3............           1,240           1,240
 ethane.
Trifluoro(fluoromethoxy)methane.....          2261-01-0  CH2FOCF3...............             751             751
----------------------------------------------------------------------------------------------------------------
                        Saturated HFEs and HCFEs With Three or More Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
HFE-143a............................           421-14-7  CH3OCF3................             756             523
HFE-245cb2..........................         22410-44-2  CH3OCF2CF3.............             708             654
HFE-245fa1..........................         84011-15-4  CHF2CH2OCF3............             286             828
HFE-245fa2..........................          1885-48-9  CHF2OCH2CF3............             659             812
HFE-254cb2..........................           425-88-7  CH3OCF2CHF2............             359             301
HFE-263fb2..........................           460-43-5  CF3CH2OCH3.............              11               1
HFE-263m1; R-E-143a.................           690-22-2  CF3OCH2CH3.............              29              29
HFE-347mcc3 (HFE-7000)..............           375-03-1  CH3OCF2CF2CF3..........             575             530
HFE-347mcf2.........................        171182-95-9  CF3CF2OCH2CHF2.........             374             854
HFE-347mmy1.........................         22052-84-2  CH3OCF(CF3)2...........             343             363
HFE-347mmz1 (Sevoflurane)...........         28523-86-6  (CF3)2CHOCH2F..........             216             216
HFE-347pcf2.........................           406-78-0  CHF2CF2OCH2CF3.........             580             889
HFE-356mec3.........................           382-34-3  CH3OCF2CHFCF3..........             101             387
HFE-356mff2.........................           333-36-8  CF3CH2OCH2CF3..........              17              17
HFE-356mmz1.........................         13171-18-1  (CF3)2CHOCH3...........              27              14
HFE-356pcc3.........................        160620-20-2  CH3OCF2CF2CHF2.........             110             413
HFE-356pcf2.........................         50807-77-7  CHF2CH2OCF2CHF2........             265             719
HFE-356pcf3.........................         35042-99-0  CHF2OCH2CF2CHF2........             502             446
HFE-365mcf2.........................         22052-81-9  CF3CF2OCH2CH3..........              58              58
HFE-365mcf3.........................           378-16-5  CF3CF2CH2OCH3..........              11            0.99
HFE-374pc2..........................           512-51-6  CH3CH2OCF2CHF2.........             557             627
HFE-449s1 (HFE-7100) Chemical blend.        163702-07-6  C4F9OCH3...............             297             421
                                            163702-08-7  (CF3)2CFCF2OCH3........  ..............  ..............
HFE-569sf2 (HFE-7200) Chemical blend        163702-05-4  C4F9OC2H5..............              59              57
                                            163702-06-5  (CF3)2CFCF2OC2H5.......  ..............  ..............
HFE-7300............................        132182-92-4  (CF3)2CFCFOC2H5CF2CF2CF           * 270             405
                                                          3.

[[Page 32866]]

 
HFE-7500............................        297730-93-9  n-C3F7CFOC2H5CF(CF3)2..           * 270              13
HG'-01..............................         73287-23-7  CH3OCF2CF2OCH3.........             222             222
HG'-02..............................        485399-46-0  CH3O(CF2CF2O)2CH3......             236             236
HG'-03..............................        485399-48-2  CH3O(CF2CF2O)3CH3......             221             221
Difluoro(methoxy)methane............           359-15-9  CH3OCHF2...............             144             144
2-Chloro-1,1,2-trifluoro-1-                    425-87-6  CH3OCF2CHFCl...........             122             122
 methoxyethane.
1-Ethoxy-1,1,2,2,3,3,3-                      22052-86-4  CF3CF2CF2OCH2CH3.......              61              61
 heptafluoropropane.
2-Ethoxy-3,3,4,4,5-                         920979-28-8  C12H5F19O2.............              56              56
 pentafluorotetrahydro-2,5-
 bis[1,2,2,2-tetrafluoro-1-
 (trifluoromethyl)ethyl]-furan.
1-Ethoxy-1,1,2,3,3,3-                          380-34-7  CF3CHFCF2OCH2CH3.......              23              23
 hexafluoropropane.
Fluoro(methoxy)methane..............           460-22-0  CH3OCH2F...............              13              13
1,1,2,2-Tetrafluoro-3-methoxy-               60598-17-6  CHF2CF2CH2OCH3.........             0.5            0.49
 propane; Methyl 2,2,3,3-
 tetrafluoropropyl ether.
1,1,2,2-Tetrafluoro-1-                       37031-31-5  CH2FOCF2CF2H...........             871             871
 (fluoromethoxy)ethane.
Difluoro(fluoromethoxy)methane......           461-63-2  CH2FOCHF2..............             617             617
Fluoro(fluoromethoxy)methane........           462-51-1  CH2FOCH2F..............             130             130
----------------------------------------------------------------------------------------------------------------
                                      Saturated Chlorofluorocarbons (CFCs)
----------------------------------------------------------------------------------------------------------------
E-R316c.............................          3832-15-3  trans-cyc (-                     * 2000           4,230
                                                          CClFCF2CF2CClF-).
Z-R316c.............................          3934-26-7  cis-cyc (-                       * 2000           5,660
                                                          CClFCF2CF2CClF-).
----------------------------------------------------------------------------------------------------------------
                                              Fluorinated Formates
----------------------------------------------------------------------------------------------------------------
Trifluoromethyl formate.............         85358-65-2  HCOOCF3................             588             588
Perfluoroethyl formate..............        313064-40-3  HCOOCF2CF3.............             580             580
1,2,2,2-Tetrafluoroethyl formate....        481631-19-0  HCOOCHFCF3.............             470             470
Perfluorobutyl formate..............        197218-56-7  HCOOCF2CF2CF2CF3.......             392             392
Perfluoropropyl formate.............        271257-42-2  HCOOCF2CF2CF3..........             376             376
1,1,1,3,3,3-Hexafluoropropan-2-yl           856766-70-6  HCOOCH(CF3)2...........             333             333
 formate.
2,2,2-Trifluoroethyl formate........         32042-38-9  HCOOCH2CF3.............              33              33
3,3,3-Trifluoropropyl formate.......       1344118-09-7  HCOOCH2CH2CF3..........              17              17
----------------------------------------------------------------------------------------------------------------
                                              Fluorinated Acetates
----------------------------------------------------------------------------------------------------------------
Methyl 2,2,2-trifluoroacetate.......           431-47-0  CF3COOCH3..............              52              52
1,1-Difluoroethyl 2,2,2-                   1344118-13-3  CF3COOCF2CH3...........              31              31
 trifluoroacetate.
Difluoromethyl 2,2,2-                         2024-86-4  CF3COOCHF2.............              27              27
 trifluoroacetate.
2,2,2-Trifluoroethyl 2,2,2-                    407-38-5  CF3COOCH2CF3...........               7               7
 trifluoroacetate.
Methyl 2,2-difluoroacetate..........           433-53-4  HCF2COOCH3.............               3               3
Perfluoroethyl acetate..............        343269-97-6  CH3COOCF2CF3...........             2.1               2
Trifluoromethyl acetate.............         74123-20-9  CH3COOCF3..............             2.0               2
Perfluoropropyl acetate.............       1344118-10-0  CH3COOCF2CF2CF3........             1.8               2
Perfluorobutyl acetate..............        209597-28-4  CH3COOCF2CF2CF2CF3.....             1.6               2
Ethyl 2,2,2-trifluoroacetate........           383-63-1  CF3COOCH2CH3...........             1.3               1
----------------------------------------------------------------------------------------------------------------
                                               Carbonofluoridates
----------------------------------------------------------------------------------------------------------------
Methyl carbonofluoridate............          1538-06-3  FCOOCH3................              95              95
1,1-Difluoroethyl carbonofluoridate.       1344118-11-1  FCOOCF2CH3.............              27              27
----------------------------------------------------------------------------------------------------------------
                             Fluorinated Alcohols Other Than Fluorotelomer Alcohols
----------------------------------------------------------------------------------------------------------------
Bis(trifluoromethyl)-methanol.......           920-66-1  (CF3)2CHOH.............             195             182
2,2,3,3,4,4,5,5-                             16621-87-7  cyc (-(CF2)4CH(OH)-)...              73              13
 Octafluorocyclopentanol.
2,2,3,3,3-Pentafluoropropanol.......           422-05-9  CF3CF2CH2OH............              42              19
2,2,3,3,4,4,4-Heptafluorobutan-1-ol.           375-01-9  C3F7CH2OH..............              25              34
2,2,2-Trifluoroethanol..............            75-89-8  CF3CH2OH...............              20              20
2,2,3,4,4,4-Hexafluoro-1-butanol....           382-31-0  CF3CHFCF2CH2OH.........              17              17
2,2,3,3-Tetrafluoro-1-propanol......            76-37-9  CHF2CF2CH2OH...........              13              13
2,2-Difluoroethanol.................           359-13-7  CHF2CH2OH..............               3               3
2-Fluoroethanol.....................           371-62-0  CH2FCH2OH..............             1.1             1.1
4,4,4-Trifluorobutan-1-ol...........           461-18-7  CF3(CH2)2CH2OH.........            0.05            0.05
----------------------------------------------------------------------------------------------------------------
                                 Non-Cyclic, Unsaturated Perfluorocarbons (PFCs)
----------------------------------------------------------------------------------------------------------------
PFC-1114; TFE.......................           116-14-3  CF2=CF2; C2F4..........           0.004           0.004
PFC-1216; Dyneon HFP................           116-15-4  C3F6; CF3CF=CF2........            0.05            0.05

[[Page 32867]]

 
Perfluorobut-2-ene..................           360-89-4  CF3CF=CFCF3............            1.82            1.82
Perfluorobut-1-ene..................           357-26-6  CF3CF2CF=CF2...........            0.10            0.10
Perfluorobuta-1,3-diene.............           685-63-2  CF2=CFCF=CF2...........           0.003           0.003
----------------------------------------------------------------------------------------------------------------
             Non-Cyclic, Unsaturated Hydrofluorocarbons (HFCs) and Hydrochlorofluorocarbons (HCFCs)
----------------------------------------------------------------------------------------------------------------
HFC-1132a; VF2......................            75-38-7  C2H2F2, CF2=CH2........            0.04            0.04
HFC-1141; VF........................            75-02-5  C2H3F, CH2=CHF.........            0.02            0.02
(E)-HFC-1225ye......................          5595-10-8  CF3CF=CHF(E)...........            0.06            0.06
(Z)-HFC-1225ye......................          5528-43-8  CF3CF=CHF(Z)...........            0.22            0.22
Solstice 1233zd(E)..................        102687-65-0  C3H2ClF3; CHCl=CHCF3...            1.34            1.34
HCFO-1233zd(Z)......................         99728-16-2  (Z)-CF3CH=CHCl.........             * 1            0.45
HFC-1234yf; HFO-1234yf..............           754-12-1  C3H2F4; CF3CF=CH2......            0.31            0.31
HFC-1234ze(E).......................          1645-83-6  C3H2F4; trans-CF3CH=CHF            0.97            0.97
HFC-1234ze(Z).......................         29118-25-0  C3H2F4; cis-CF3CH=CHF;             0.29            0.29
                                                          CF3CH=CHF.
HFC-1243zf; TFP.....................           677-21-4  C3H3F3, CF3CH=CH2......            0.12            0.12
(Z)-HFC-1336........................           692-49-9  CF3CH=CHCF3(Z).........            1.58            1.58
HFO-1336mzz(E)......................         66711-86-2  (E)-CF3CH=CHCF3........             * 1              18
HFC-1345zfc.........................           374-27-6  C2F5CH=CH2.............            0.09            0.09
HFO-1123............................           359-11-5  CHF=CF2................             * 1           0.005
HFO-1438ezy(E)......................         14149-41-8  (E)-(CF3)2CFCH=CHF.....             * 1             8.2
HFO-1447fz..........................           355-08-8  CF3(CF2)2CH=CH2........             * 1            0.24
Capstone 42-U.......................         19430-93-4  C6H3F9, CF3(CF2)3CH=CH2            0.16            0.16
Capstone 62-U.......................         25291-17-2  C8H3F13,                           0.11            0.11
                                                          CF3(CF2)5CH=CH2.
Capstone 82-U.......................         21652-58-4  C10H3F17,                          0.09            0.09
                                                          CF3(CF2)7CH=CH2.
(e)-1-chloro-2-fluoroethene.........           460-16-2  (E)-CHCl=CHF...........             * 1           0.004
3,3,3-trifluoro-2-                             382-10-5  (CF3)2C=CH2............             * 1            0.38
 (trifluoromethyl)prop-1-ene.
----------------------------------------------------------------------------------------------------------------
                                          Non-Cyclic, Unsaturated CFCs
----------------------------------------------------------------------------------------------------------------
CFC-1112............................           598-88-9  CClF=CClF..............             * 1            0.13
CFC-1112a...........................            79-35-6  CCl2=CF2...............             * 1           0.021
----------------------------------------------------------------------------------------------------------------
                                   Non-Cyclic, Unsaturated Halogenated Ethers
----------------------------------------------------------------------------------------------------------------
PMVE; HFE-216.......................          1187-93-5  CF3OCF=CF2.............            0.17            0.17
Fluoroxene..........................           406-90-6  CF3CH2OCH=CH2..........            0.05            0.05
Methyl-perfluoroheptene-ethers......                N/A  CH3OC7F13..............             * 1              15
----------------------------------------------------------------------------------------------------------------
                                   Non-Cyclic, Unsaturated Halogenated Esters
----------------------------------------------------------------------------------------------------------------
Ethenyl 2,2,2-trifluoroacetate......           433-28-3  CF3COOCH=CH2...........             * 1           0.008
Prop-2-enyl 2,2,2-trifluoroacetate..           383-67-5  CF3COOCH2CH=CH2........             * 1           0.007
----------------------------------------------------------------------------------------------------------------
                                        Cyclic, Unsaturated HFCs and PFCs
----------------------------------------------------------------------------------------------------------------
PFC C-1418..........................           559-40-0  c-C5F8.................            1.97               2
Hexafluorocyclobutene...............           697-11-0  cyc (-CF=CFCF2CF2-)....             * 1             126
1,3,3,4,4,5,5-                                1892-03-1  cyc (-CF2CF2CF2CF=CH-).             * 1              45
 heptafluorocyclopentene.
1,3,3,4,4-pentafluorocyclobutene....           374-31-2  cyc (-CH=CFCF2CF2-)....             * 1              92
3,3,4,4-tetrafluorocyclobutene......          2714-38-7  cyc (-CH=CHCF2CF2-)....             * 1              26
----------------------------------------------------------------------------------------------------------------
                                              Fluorinated Aldehydes
----------------------------------------------------------------------------------------------------------------
3,3,3-Trifluoro-propanal............           460-40-2  CF3CH2CHO..............            0.01            0.01
----------------------------------------------------------------------------------------------------------------
                                               Fluorinated Ketones
----------------------------------------------------------------------------------------------------------------
Novec 1230 (perfluoro (2-methyl-3-             756-13-8  CF3CF2C(O)CF(CF3)2.....             0.1             0.1
 pentanone)).
1,1,1-trifluoropropan-2-one.........           421-50-1  CF3COCH3...............             * 1            0.09
1,1,1-trifluorobutan-2-one..........           381-88-4  CF3COCH2CH3............             * 1           0.095
----------------------------------------------------------------------------------------------------------------
                                             Fluorotelomer Alcohols
----------------------------------------------------------------------------------------------------------------
3,3,4,4,5,5,6,6,7,7,7-                      185689-57-0  CF3(CF2)4CH2CH2OH......            0.43            0.43
 Undecafluoroheptan-1-ol.
3,3,3-Trifluoropropan-1-ol..........          2240-88-2  CF3CH2CH2OH............            0.35            0.35
3,3,4,4,5,5,6,6,7,7,8,8,9,9,9-                 755-02-2  CF3(CF2)6CH2CH2OH......            0.33            0.33
 Pentadecafluorononan-1-ol.

[[Page 32868]]

 
3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11         87017-97-8  CF3(CF2)8CH2CH2OH......            0.19            0.19
 ,11,11-Nonadecafluoroundecan-1-ol.
----------------------------------------------------------------------------------------------------------------
                                   Fluorinated GHGs With Carbon-Iodine Bond(s)
----------------------------------------------------------------------------------------------------------------
Trifluoroiodomethane................          2314-97-8  CF3I...................             0.4             0.4
----------------------------------------------------------------------------------------------------------------
                             Remaining Fluorinated GHGs With Chemical-Specific GWPs
----------------------------------------------------------------------------------------------------------------
Dibromodifluoromethane (Halon 1202).            75-61-6  CBr2F2.................             231             231
2-Bromo-2-chloro-1,1,1-                        151-67-7  CHBrClCF3..............              41              41
 trifluoroethane (Halon-2311/
 Halothane).
Heptafluoroisobutyronitrile.........         42532-60-5  (CF3)2CFCN.............          * 2000           2,750
Carbonyl fluoride...................           353-50-4  COF2...................          * 2000         ** 0.14
----------------------------------------------------------------------------------------------------------------
* Table A-1 does not include a chemical-specific value for this GHG; the value shown is the current default GWP
  for the fluorinated GHG group of which the GHG is currently a member.
** Proposed in 2022 Data Quality Improvements Proposal.

    We are also proposing to revise the default GWPs in Table A-1 by 
adding two new fluorinated GHG groups, modifying an existing group, and 
updating the existing default values to reflect the chemical-specific 
GWPs that we are proposing to adopt from AR5 and AR6.\25\ The two new 
groups that we are proposing to add are for saturated 
chlorofluorocarbons (CFCs) and for cyclic forms of unsaturated 
halogenated compounds. We have not previously included a group for 
saturated CFCs because the GHGRP does not require reporting of most 
CFCs. The GHGRP definition of ``fluorinated greenhouse gas'' (that is 
itself referenced in the GHGRP definition of ``greenhouse gas'') at 40 
CFR 98.6, includes ``sulfur hexafluoride (SF6), nitrogen 
trifluoride (NF3), and any fluorocarbon except for 
controlled substances as defined at 40 CFR part 82, subpart A and 
substances with vapor pressures of less than 1 mm of Hg absolute at 25 
degrees C.'' Although CFCs are fluorocarbons, most CFCs are defined as 
``controlled substances'' under the EPA's ozone protection regulations 
at 40 CFR part 82, excluding them from GHGRP coverage. However, some 
CFCs are not defined as ``controlled substances'' under part 82 and are 
therefore reportable under the GHGRP. These include two saturated CFCs 
((E)-1,2-dichlorohexafluoro cyclobutane and (Z)-1,2-
dichlorohexafluorocyclobutane) and two unsaturated CFCs (CFC 1112 and 
CFC 1112a) for which GWPs are provided in AR6. In the 2022 Data Quality 
Improvements Proposal, we have proposed to include unsaturated CFCs 
with unsaturated HFCs and PFCs in the current ninth fluorinated GHG 
group, which is assigned a default GWP of 1. (The unsaturated CFCs both 
have GWPs below 1.) The saturated CFCs have GWPs of 4,230 and 5,660 
respectively, placing their proposed default GWP (4,900) between the 
updated default GWPs proposed for saturated HFCs with two or fewer 
carbon-hydrogen bonds (3,000) and for saturated HFEs and HCFEs with one 
carbon-hydrogen bond (6,600). Given the numerical differences between 
the GWP for the saturated CFC group and the GWPs for the other groups, 
as well as the chemical differences between CFCs, HFCs, and HFEs, we 
are proposing a separate group and separate default GWP for saturated 
CFCs.
---------------------------------------------------------------------------

    \25\ In the 2014 Fluorinated GHG Final Rule, we established 12 
default GWPs intended for fluorinated GHGs and fluorinated HTFs for 
which peer-reviewed GWPs were not available in AR4, AR5, or other 
sources. The default GWPs were calculated based on the average of 
the chemical-specific GWPs of the compounds in each fluorinated GHG 
group. Each fluorinated GHG group is composed of compounds with 
similar chemical structures, which have similar atmospheric 
lifetimes and GWPs.
---------------------------------------------------------------------------

    We are also proposing to establish a separate group for cyclic 
unsaturated halogenated compounds, specifically, for the cyclic forms 
of the following: unsaturated PFCs, unsaturated HFCs, unsaturated CFCs, 
unsaturated hydrochlorofluorocarbons (HCFCs), unsaturated 
bromofluorocarbons (BFCs), unsaturated bromochlorofluorocarbons 
(BCFCs), unsaturated hydrobromofluorocarbons (HBFCs), unsaturated 
hydrobromochlorofluoro carbons (HBCFCs), unsaturated halogenated 
ethers, and unsaturated halogenated esters. AR6 includes GWPs for five 
members of this set (all unsaturated HFCs or PFCs), ranging from 25.6 
to 126. These GWPs are markedly larger than the GWPs for the non-cyclic 
unsaturated halogenated compounds currently in the ninth fluorinated 
GHG group, most of which are less than 1.\26\ The default GWP proposed 
for the new group is 58, far higher than the value of 1 currently in 
effect for the unsaturated halogenated compounds in the ninth 
fluorinated GHG group. The new group would affect how the cyclic 
unsaturated halogenated compounds are classified for reporting under 
subparts A and L (Fluorinated Gas Production), and the corresponding 
default GWP would be applied to cyclic unsaturated halogenated 
compounds that do not have chemical-specific GWPs listed in AR5 or AR6. 
One cyclic unsaturated PFC that is currently included in the 
unsaturated group with the default GWP of 1, perfluorocyclopentene, 
would be moved into the new group for purposes of classification and 
calculation of the default GWP of the group.\27\
---------------------------------------------------------------------------

    \26\ This is true for both the AR5 and AR6 GWP values for the 
non-cyclic unsaturated compounds. Twenty-six of the 32 AR6 GWP 
values for these compounds fall under 1 while six fall above 1, with 
a maximum value of 18.
    \27\ Perfluorocyclopentene is assigned GWP values of 2 and 78 in 
AR5 and AR6 respectively. The AR5 value was used in the calculation 
of the proposed default value for the cyclic unsaturated halogenated 
compounds.
---------------------------------------------------------------------------

    The proposed new and revised fluorinated GHG groups and their 
proposed new and revised GWPs are listed in Table 3 of this preamble.

[[Page 32869]]

        Table 3--Proposed Fluorinated GHG Groups and Default GWPs
------------------------------------------------------------------------
                                                  Current      Proposed
                                                   global       global
             Fluorinated GHG group                warming      warming
                                                 potential    potential
                                                 (100 yr.)    (100 yr.)
------------------------------------------------------------------------
Fully fluorinated GHGs........................       10,000        9,200
Saturated hydrofluorocarbons (HFCs) with two          3,700        3,000
 or fewer carbon-hydrogen bonds...............
Saturated HFCs with three or more carbon-               930          840
 hydrogen bonds...............................
Saturated hydrofluoroethers (HFEs) and                5,700        6,600
 hydrochlorofluoroethers (HCFEs) with one
 carbon-hydrogen bond.........................
Saturated HFEs and HCFEs with two carbon-             2,600        2,900
 hydrogen bonds...............................
Saturated HFEs and HCFEs with three or more             270          320
 carbon-hydrogen bonds........................
Saturated chlorofluorocarbons (CFCs)..........      * 2,000        4,900
Fluorinated formates..........................          350          350
Cyclic forms of the following: unsaturated             ** 1           58
 perfluorocarbons (PFCs), unsaturated HFCs,
 unsaturated CFCs, unsaturated
 hydrochlorofluorocarbons (HCFCs), unsaturated
 bromofluorocarbons (BFCs), unsaturated
 bromochlorofluorocarbons (BCFCs), unsaturated
 hydrobromofluorocarbons (HBFCs), unsaturated
 hydrobromochlorofluorocarbons (HBCFCs),
 unsaturated halogenated ethers, and
 unsaturated halogenated esters...............
Fluorinated acetates, carbonofluoridates, and            30           25
 fluorinated alcohols other than fluorotelomer
 alcohols.....................................
Fluorinated aldehydes, fluorinated ketones,               1            1
 and non-cyclic forms of the following:
 unsaturated PFCs, unsaturated HFCs,
 unsaturated CFCs, unsaturated HCFCs,
 unsaturated BFCs, unsaturated BCFCs,
 unsaturated HBFCs, unsaturated HBCFCs,
 unsaturated halogenated ethers, and
 unsaturated halogenated esters...............
Fluorotelomer alcohols........................            1            1
Fluorinated GHGs with carbon-iodine bond(s)...            1            1
Remaining fluorinated GHGs....................        2,000        1,800
------------------------------------------------------------------------
* Based on current classification as ``Other fluorinated GHGs.''
** Based on current classification as ``Unsaturated perfluorocarbons
  (PFCs), unsaturated HFCs, unsaturated hydrochlorofluorocarbons
  (HCFCs), unsaturated halogenated ethers, unsaturated halogenated
  esters.''

2. Additional Proposed Revisions To Improve the Quality of Data 
Collected for Subpart A
    The EPA is proposing several revisions to subpart A to align with 
the proposed addition of subparts B (Energy Consumption), WW (Coke 
Calciners), XX (Calcium Carbide Production), YY (Caprolactam, Glyoxal, 
and Glyoxylic Acid Production), and ZZ (Ceramics Manufacturing), as 
described in sections II.B and IV of this preamble. First, we are 
proposing to revise 40 CFR 98.2(a)(1) through (3) to clarify that (1) 
direct emitters required to report under any source category listed in 
Tables A-3 or A-4 to subpart A of part 98 or stationary fuel combustion 
sources that meet the requirements of 40 CFR 98.2(a)(3), or required to 
resume reporting under Sec. Sec.  98.2(i)(1), (2), or (3); and (2) that 
are not eligible to discontinue reporting under the provisions of 40 
CFR 98.2(i)(1) through (3), would be required to cover metered 
purchased energy consumption (proposed subpart B) in their annual GHG 
report. As described in section IV.A of this preamble, direct emitters 
subject to part 98 would be required to report the annual quantity of 
electricity purchased and the annual quantity of thermal energy 
products purchased. Specifically, we are proposing to revise paragraphs 
98.2(a)(1) through (3) to add that the annual GHG report must cover 
``energy consumption (subpart B of this part)'' for facilities that are 
subject to direct emitter subparts. Additionally, we are proposing to 
revise the reporting requirements for the annual GHG report in 40 CFR 
98.3(c)(4) to add a requirement for facilities to report the annual 
quantities of electricity purchased and the annual quantities of 
thermal energy products purchased. The proposed requirements ensure 
that facilities that report emissions of GHGs include total energy 
consumption data with the annual report. Additional information on 
proposed subpart B may be found in section IV.A of this preamble.
    Similarly, we are proposing to revise Table A-3 and Table A-4 to 
part 98 to clarify the reporting applicability for facilities included 
in the proposed new source categories described in sections IV.B 
through E of this preamble. Currently, a facility included in a source 
category listed in Table A-3 to subpart A of part 98 is subject to 
reporting under part 98. Source categories in Table A-3 are referred to 
as ``all-in'' source categories because reporting applies regardless of 
other source category or stationary fuel combustion emissions at the 
facility. The EPA's ``all-in'' approach generally applies for 
industries for which all facilities are emitters of a similar quantity, 
or where the EPA has determined it requires more data on certain 
industries to identify the parameters that influence GHG emissions from 
the source category. A facility that contains a source category listed 
in Table A-4 to subpart A of part 98 must report only if estimated 
annual emissions from all applicable source categories in Tables A-3 
and Table A-4 of part 98 are 25,000 metric tons carbon dioxide 
equivalents (mtCO2e) or more. Source categories in Table A-4 
are referred to as ``threshold'' source categories. The EPA's 
``threshold'' approach generally applies when a source category 
contains emitters with a range in emissions quantity and the EPA wants 
to collect information from those facilities within the source category 
with larger total emissions from multiple process units or collocated 
source categories that emit larger levels of GHGs collectively, and not 
burden smaller emitters with a reporting obligation.
    We are proposing to revise Table A-3 to subpart A of part 98 to 
include new source categories for coke calciners (subpart WW), calcium 
carbide production (subpart XX), and caprolactam, glyoxal, and 
glyoxylic acid production (subpart YY). For coke calciners (subpart 
WW), as discussed in section IV.B of this preamble, we are proposing to 
include the source category as an ``all-in'' source category in Table 
A-3; based on the threshold analysis, most coke calciners are large 
emission sources that would be expected to exceed all of the thresholds 
considered, with no significant differences in the coverage of 
reporting facilities or the total U.S. emissions covered. As described 
in section IV.C of this preamble, we determined in a threshold analysis 
for the calcium carbide production source category that there is a 
single producer of calcium carbide in the United States whose known 
emissions would well exceed the 25,000 mtCO2e threshold 
currently referenced in 40 CFR 98.2(a)(2). Therefore, we are proposing 
to require that all facilities report in this source category, which 
would capture all U.S. emissions and

[[Page 32870]]

avoid the need for the facility to calculate whether GHG emissions 
exceed the threshold value. The threshold analysis for the caprolactam, 
glyoxal, and glyoxylic acid production source category, as described in 
detail in section IV.D of this preamble, identified and estimated 
emissions for six facilities and concluded that setting a threshold of 
25,000 mtCO2e would cover only half of the identified 
facilities but result in only a small difference in the total U.S. 
emissions that would be covered. After considering this information, we 
are proposing to add the caprolactam, glyoxal, and glyoxylic acid 
production source category as an ``all-in'' source category to Table A-
3 to subpart A of part 98 to gather information from all applicable 
facilities, in order to account for the uncertainty in the data and 
assumptions used in the threshold analysis (see section IV.D.4 of this 
preamble for additional information). The proposed revisions to Table 
A-3 specify that new subparts WW, XX, and YY would become applicable in 
RY2025 (see section V of this preamble for additional details).\28\
---------------------------------------------------------------------------

    \28\ The proposed revisions to Table A-3 to subpart A also 
include the proposed source category for Geologic Sequestration of 
Carbon Dioxide with Enhanced Oil Recovery Using ISO 27916, proposed 
as subpart VV of part 98 in the 2022 Data Quality Improvements 
Proposal. Under this supplemental proposal, we are now proposing 
this rule, if finalized, would be applicable in RY2025.
---------------------------------------------------------------------------

    We are proposing to revise Table A-4 to subpart A of part 98 to 
include a new source category for ceramics production (subpart ZZ). As 
described in sections IV.E of this preamble, we conducted a threshold 
analysis for the ceramics production source category and determined the 
facilities in this source category have a broader range in emissions 
quantity. In order to collect information from those facilities within 
the source category with larger total emissions from multiple process 
units, or collocated source categories that emit larger levels of GHGs 
collectively, we are proposing to assign a threshold of 25,000 
mtCO2e. For ceramics production (subpart ZZ), we are 
proposing that part 98 would apply to certain ceramics production 
processes that exceed a minimum production level (i.e., annually 
consume at least 2,000 tons of carbonates or 20,000 tons of clay heated 
to a temperature sufficient to allow the calcination reaction to occur) 
and that exceed the 25,000 mtCO2e threshold. The proposed 
requirements would ensure coverage of large ceramics production 
facilities, while reducing the reporting burden for facilities with 
collocated source categories that may have already met GHGRP reporting 
thresholds under a different subpart of part 98 but may only have a 
small artisan-level ceramics process on site. We are proposing to 
revise Table A-4 such that new subpart ZZ would become applicable in 
RY2025. See section V of this preamble for additional details on the 
anticipated schedule for the proposed amendments.
    In keeping with the proposed revisions discussed in section II.A.1 
of this preamble, we are proposing minor clarifications to the 
reporting and special provisions for best available monitoring methods 
in 40 CFR 98.3(k) and (l), which apply to owners or operators of 
facilities or suppliers that first become subject to any subpart of 
part 98 due to amendment to Table A-1 to subpart A. The current 
provisions, which were incorporated in the 2014 Fluorinated Gas Final 
Rule, require that these facilities or suppliers must start monitoring 
and collecting GHG data in compliance with the applicable subparts of 
part 98 to which the facility is subject ``starting on January 1 of the 
year after the year during which the change in GWPs is published,'' and 
provide for the use of best available monitoring methods, as 
applicable, for a period of three months ``of the year after the year 
during which the change in GWPs is published.'' Specifically, we are 
proposing to revise the term ``published'' to add ``in the Federal 
Register as a final rulemaking.'' The proposed changes would clarify 
the EPA's intent that the requirements apply to facilities or supplies 
that are first subject to the GHGRP in the year after the year the GWP 
is published as part of a final rule.
    For the reasons described in section II.E of this preamble, the EPA 
is proposing amendments to several defined terms in the General 
Provisions. First, we are proposing to revise the definition of 
``bulk'' to provide clarity to the regulated community. Under 40 CFR 
98.6 ``bulk'' is currently defined as ``with respect to industrial GHG 
suppliers and CO2 suppliers, [bulk] means the transfer of a 
product inside containers, including, but not limited to tanks, 
cylinders, drums, and pressure vessels.'' Importers of industrial GHGs 
have had questions regarding this definition, particularly whether 
imports of motor vehicle air conditioner charging kits would fall 
within this definition given that the gas is in small cans in this 
case. The EPA notes that the current definition does not include any 
limit or restriction based on the size of the vessel in which the 
industrial GHG or CO2 is transferred. Therefore, we maintain 
that the imports of industrial GHGs and CO2 in small cans, 
such as motor vehicle air conditioner charging kits, would be 
reportable under subpart OO (Suppliers of Industrial Greenhouse Gases) 
based on our current definition of bulk. However, to improve clarity, 
the EPA is proposing to revise the definition of bulk to read that 
``Bulk, with respect to industrial GHG suppliers and CO2 
suppliers, means a transfer of gas in any amount that is in a container 
for the transportation or storage of that substance such as cylinders, 
drums, ISO tanks, and small cans. An industrial gas or CO2 
that must first be transferred from a container to another container, 
vessel, or piece of equipment in order to realize its intended use is a 
bulk substance. An industrial GHG or CO2 that is contained 
in a manufactured product such as electrical equipment, appliances, 
aerosol cans, or foams is not a bulk substance.''
    The revised definition would provide clarity to the regulated 
community regarding whether the import or export of gas in small 
containers would be considered ``bulk.'' The definition also provides 
additional details for suppliers to determine whether different types 
of imports or exports would fall within the definition. For example, 
this definition makes it clear that imports of motor vehicle air 
conditioner charging kits would qualify as imports of bulk substances, 
because the gas must first be transferred from a container (i.e., the 
kit) to another container, vessel, or piece of equipment (i.e., the 
motor vehicle) in order to realize its intended use (i.e., comfort 
cooling). In addition, the revised definition makes it clear that gas 
contained in pre-charged equipment, appliances, foams, or aerosol cans 
would not qualify as bulk substances. This is consistent with the EPA's 
consideration of bulk in the past. In response to comments on the 2009 
Final Rule (see ``Mandatory Greenhouse Gas Reporting Rule: EPA's 
Response to Public Comments Volume No.: 40 Subpart OO--Suppliers of 
Industrial Greenhouse Gases, September 2009''), we stated that the 
``term `bulk' is intended to distinguish imports and exports in 
containers (cylinders, drums, etc.) from imports and exports in 
products; it is not intended to establish a minimum container or 
shipment size below which reporting would not be required.'' After 
considering comments, the EPA did include provisions in the industrial 
gas supply reporting requirements (40 CFR 98.416) that exempt small 
shipments (those including less than 25 kilograms) from the import and 
export reporting requirements. However, a minimum

[[Page 32871]]

shipment size does not imply a minimum container size.
    Finally, the revised definition would align the definition of 
``bulk'' for industrial GHGs and CO2 under the GHG Reporting 
Rule (40 CFR part 98) with the definition of ``bulk'' under the 
regulations to phasedown hydrofluorocarbons (40 CFR part 84). We 
recognize that some importers and exporters of industrial gases would 
be covered under both programs, and that a consistent definition would 
promote efficiency and clarity for implementation of both programs. For 
example, we anticipate that importers and exporters may use the data 
entered in the EPA's HFC and ODS Allowance Tracking (HAWK) system to 
generate draft reporting forms that could be reviewed and submitted to 
the EPA's e-GGRT annual reporting system under subpart OO of 40 CFR 
part 98. A consistent set of definitions between the two programs would 
simplify reporting. Relatedly, we seek comment on whether this 
definition of bulk would be useful for suppliers of carbon dioxide 
(subpart PP of part 98).
    Next, the EPA is proposing to revise the definition of ``greenhouse 
gas or GHG'' to clarify the treatment of fluorinated greenhouse gases. 
The definition of ``greenhouse gas or GHG'' currently includes both a 
reference to the definition of ``fluorinated greenhouse gas'' and a 
partial list of the fluorinated GHGs that are encompassed by the 
definition of ``fluorinated greenhouse gas.'' To simplify and clarify 
the definition of ``greenhouse gas or GHG,'' we are proposing to remove 
the partial list of fluorinated GHGs currently included in the 
definition and to simply refer to the definition of ``fluorinated 
greenhouse gas (GHGs).'' We are also proposing to explicitly include 
the acronym ``(GHGs)'' after the term ``fluorinated greenhouse gas'' 
both in the definition of ``greenhouse gas or GHG'' and in the 
definition of ``fluorinated greenhouse gas.'' This change would not 
affect the scope of substances that are considered GHGs under part 98 
but would avoid redundancy and potential confusion between the 
definitions of ``greenhouse gas'' and ``fluorinated greenhouse gas.'' 
With this revision, the definition of ``Greenhouse gas or GHG'' would 
read: ``Greenhouse gas or GHG means carbon dioxide (CO2), 
methane (CH4), nitrous oxide (N2O), and 
fluorinated greenhouse gases (GHGs) as defined in this section.''
    Consistent with our proposed revisions of the fluorinated GHG 
groups used to assign default GWPs, discussed in section III.A.1 of 
this preamble, the EPA is also proposing to add seven definitions and 
to revise two definitions of fluorinated GHG groups or of compound 
types or molecular structures within those groups. Specifically, we are 
proposing to add definitions of ``unsaturated chlorofluorocarbons 
(CFCs),'' ``saturated chlorofluorocarbons (CFCs),'' ``unsaturated 
bromofluorocarbons (BFCs),'' ``unsaturated bromochlorofluorocarbons 
(BCFCs),'' ``unsaturated hydrobromofluorocarbons (HBFCs),'' and 
``unsaturated hydrobromochlorofluorocarbons (HBCFCs).'' In addition, we 
are proposing to add a definition of ``cyclic'' as it applies to 
molecular structures of various fluorinated GHGs. We are also proposing 
to revise the definition of ``fluorinated greenhouse (GHG) group'' to 
include the new and revised groups.
    We are also proposing to revise the term ``other fluorinated 
GHGs,'' which is the name of the last of the twelve fluorinated GHG 
groups that are used to assign default GWPs to compounds that do not 
have chemical-specific GWPs in Table A-1 to subpart A of part 98. The 
term ``other fluorinated GHGs'' is intended to encompass fluorinated 
GHGs that are not included in any of the first eleven fluorinated GHG 
groups that are specified based on their molecular compositions and 
structures. However, the phrase ``other fluorinated GHGs'' is also used 
in other contexts in part 98, potentially leading to confusion. For 
example, the phrase ``other fluorinated GHGs'' occurs but is not 
intended to mean the twelfth fluorinated GHG group in subpart L of part 
98 (Fluorinated Gas Production) at 40 CFR 98.122(d), 98.124(g)(1)(iv), 
98.124(g)(4), and 98.126(a)(4)(ii). We are therefore proposing to 
revise the term ``other fluorinated GHGs'' to ``remaining fluorinated 
GHGs'' to avoid such confusion.\29\ In addition, we are proposing to 
revise the definition of the term to reflect the new and revised 
fluorinated GHG groups discussed in section III.A.1 of this preamble.
---------------------------------------------------------------------------

    \29\ As discussed in section II.A.1 of this preamble regarding 
the update of global warming potentials, we are proposing to add two 
new fluorinated GHG groups in this notification. If these two new 
fluorinated GHG groups are added and the term ``other fluorinated 
GHGs'' is revised to ``remaining fluorinated GHGs'' in the final 
rule, then the group ``remaining fluorinated GHGs'' would become the 
fourteenth fluorinated GHG group.
---------------------------------------------------------------------------

    We are proposing to revise the definition of ``fluorinated heat 
transfer fluids'' and to move it from 40 CFR 98.98 to 40 CFR 98.6 to 
harmonize with proposed changes to subpart OO of part 98 (Suppliers of 
Industrial Greenhouse Gases), as discussed in section III.K of this 
preamble. Fluorinated compounds used as F-HTFs include, but are not 
limited to, perfluoropolyethers (including PFPMIE), 
perfluoroalkylamines, perfluoroalkylmorpholines, perfluoroalkanes, 
perfluoroethers, perfluorocyclic ethers, and hydrofluoroethers. Many of 
these compounds have GWPs near 10,000 and atmospheric lifetimes near 
1,000 years. Currently, the term ``fluorinated heat transfer fluids'' 
is defined under subpart I of part 98 (Electronics Manufacturing) in 
the context of electronics manufacturing, but we have become aware of 
uses of F-HTFs that are chemically similar to those listed above in 
industries other than electronics. For this reason, we are proposing to 
require suppliers of F-HTFs that report under subpart OO to identify 
the end uses for which the heat transfer fluid is used and the 
aggregated annual quantities of each F-HTF transferred to each end use. 
To clarify that the supplier reporting requirement would apply to F-
HTFs that are used outside of the electronics industry, we are 
proposing to move the definition of ``fluorinated heat transfer 
fluids'' to subpart A and to revise the definition (1) to explicitly 
include industries other than electronics manufacturing, and (2) to 
exclude most hydrofluorocarbons (HFCs), which are widely used as heat 
transfer fluids outside of electronics manufacturing (in household, 
mobile, commercial, and industrial air conditioning and refrigeration) 
and are regulated under the American Innovation and Manufacturing Act 
of 2020 (AIM) regulations at 40 CFR part 84.\30\ Including all HFCs in 
the definition of ``fluorinated heat transfer fluids'' would expand the 
definition, and the associated reporting requirements, far beyond our 
intent, which is to gather information on supplies and end uses of F-
HTFs used in electronics manufacturing and in similar specialized 
applications. The one HFC that would remain in the definition is HFC-
43-10mee, which is used as an F-HTF in electronics manufacturing and 
which, like most other F-HTFs used in electronics manufacturing (and 
unlike most HFCs used as refrigerants), is a liquid at room temperature 
and pressure. With these changes, the proposed definition of 
``fluorinated heat transfer fluids'' would read:
---------------------------------------------------------------------------

    \30\ Hydrofluorocarbons would continue to be considered 
``fluorinated greenhouse gases'' and therefore reportable under 
other provisions of part 98.

    Fluorinated heat transfer fluids means fluorinated GHGs used for 
temperature control, device testing, cleaning substrate surfaces and 
other parts, other solvent

[[Page 32872]]

applications, and soldering in certain types of electronics 
manufacturing production processes and in other industries. 
Fluorinated heat transfer fluids do not include fluorinated GHGs 
used as lubricants or surfactants in electronics manufacturing. For 
fluorinated heat transfer fluids, the lower vapor pressure limit of 
1 mm Hg in absolute at 25 [deg]C in the definition of ``fluorinated 
greenhouse gas'' in Sec.  98.6 shall not apply. Fluorinated heat 
transfer fluids include, but are not limited to, perfluoropolyethers 
(including PFPMIE), perfluoroalkylamines, perfluoroalkylmorpholines, 
perfluoroalkanes, perfluoroethers, perfluorocyclic ethers, and 
hydrofluoroethers. Fluorinated heat transfer fluids include HFC-43-
---------------------------------------------------------------------------
10meee but do not include other hydrofluorocarbons.

    We request comment on the proposed definition. We also request 
comment on other options to avoid requiring suppliers to report uses of 
HFCs (and potentially other F-GHGs) used in most air-conditioning and 
refrigeration applications, including the option of revising the 
definition to explicitly include only fluorinated GHGs that are liquid 
at room temperature (e.g., that have boiling points below 27 degrees C 
[about 81 degrees F] at one atmosphere, which is a few degrees below 
the boiling point of the F-GHG with the lowest boiling point that is 
marketed for use as an HTF, 3M\TM\ Fluorinert\TM\ FC-87.).
    In addition, the EPA is proposing to update 40 CFR 98.7 What 
standardized methods are incorporated by reference into this part? To 
reflect harmonizing changes based on the proposed addition of subparts 
B (Energy Consumption), WW (Coke Calciners), and XX (Calcium Carbide 
Production) to part 98, as well as the proposed revisions to subpart Y 
of part 98 (Petroleum Refineries). The proposed revisions surrounding 
these subparts include test methods. Specifically, the proposed 
revisions to subparts B and XX add one test method to 40 CFR 98.24(b), 
and two test methods to 40 CFR 98.504(b), respectively. The proposed 
revisions to remove coke calciners from subpart Y and add them to new 
subpart WW require not only the removal of monitoring requirements and 
associated test methods for coke calciners from subpart Y, but also 
reflect the latest versions of those test methods.
    As described in section IV.A of this preamble, under newly proposed 
subpart B, facilities would need to develop a written Metered Energy 
Monitoring Plan (MEMP). In that MEMP, facilities would be required to 
specify recordkeeping activities for electric meters, including an 
indication of whether the meter conforms to American National Standards 
Institute (ANSI) standard C12.1-2022 Electric Meters--Code for 
Electricity Metering or another, similar consensus standard with 
accuracy specifications at least as stringent as one of the cited ANSI 
standards. We are proposing to incorporate by reference this ANSI test 
method as indicated in 40 CFR 98.24(b) and 40 CFR 98.7(a).
    Per section IV.C of this preamble, calcium carbide production 
facilities would be required to analyze carbon content at least 
annually using standard ASTM methods that are currently used in similar 
source categories under part 98, including the American Society for 
Testing and Materials (ASTM) D5373-08 Standard Test Methods for 
Instrumental Determination of Carbon, Hydrogen, and Nitrogen in 
Laboratory Samples of Coal or ASTM C25-06, Standard Test Methods for 
Chemical Analysis of Limestone, Quicklime, and Hydrated Lime. We are 
proposing to revise paragraphs 40 CFR 98.7(e)(1) and (27) to add a 
reference to proposed 40 CFR 98.504(b) to clarify these methods are 
incorporated by reference for the calcium carbide production source 
category.
    As described in section III.H of this preamble, the EPA is 
proposing to remove coke calciners from subpart Y. Instead of reporting 
coke calcining unit emissions under subpart Y, facilities with coke 
calciners are proposed to report those emissions in the new proposed 
subpart WW. Subpart Y at 40 CFR 98.254(h) currently requires the 
determination of the mass of petroleum coke using Specifications, 
Tolerances, and Other Technical Requirements For Weighing and Measuring 
Devices, National Institute of Standards and Technology (NIST) Handbook 
44 (2009) and the calibration of the measurement device according to 
the procedures specified the same handbook. Those requirements are 
proposed to be removed from subpart Y and the updated version, 
Specifications, Tolerances, and Other Technical Requirements For 
Weighing and Measuring Devices, NIST Handbook 44 (2022), is proposed 
for subpart WW. These changes are reflected in subparts A, Y, and WW. 
Likewise, three methods used to help determine the carbon content of 
petroleum coke are proposed to be removed from subpart Y (40 CFR 
98.254(i)) and updated versions of those same methods are proposed for 
new subpart WW. Those methods are (1) ASTM D3176-15 Standard Practice 
for Ultimate Analysis of Coal and Coke, (2) ASTM D5291-16 Standard Test 
Methods for Instrumental Determination of Carbon, Hydrogen, and 
Nitrogen in Petroleum Products and Lubricants, and (3) ASTM D5373-21 
Standard Test Methods for Determination of Carbon, Hydrogen, and 
Nitrogen in Analysis Samples of Coal and Carbon in Analysis Samples of 
Coal and Coke.
    In the 2022 Data Quality Improvements Proposal, we proposed to add 
subpart VV to part 98 (Geologic Sequestration of Carbon Dioxide With 
Enhanced Oil Recovery Using ISO 27916). It is likely that many 
reporters that would be subject to the new proposed subpart VV would 
have previously been subject to subpart UU of part 98 (Injection of 
Carbon Dioxide). We received comments saying that the applicability of 
proposed subpart VV was unclear. Therefore, as described in sections 
III.O and III.P of this preamble, the EPA is now proposing to revise 
section 98.470 of subpart UU of part 98 and sections 98.480 and 98.481 
of proposed subpart VV to clarify the applicability of each subpart 
when a facility chooses to quantify their geologic sequestration of 
CO2 in association with EOR operations through the use of 
the CSA/ANSI ISO 27916:2019 method. The proposed changes also would 
clarify how CO2-EOR projects that may transition to use of 
the CSA/ANSI ISO 27916:2019 method during a reporting year would be 
required to report for the portion of the reporting year before they 
began using CSA/ANSI ISO 27916:2019 (under subpart UU) and for the 
portion after they began using CSA/ANSI ISO 27916:2019 (under proposed 
subpart VV). Additionally, we previously proposed to incorporate by 
reference the CSA/ANSI ISO 27916:2019 test method in the 2022 Data 
Quality Improvements Proposal. In light of these supplemental proposed 
revisions, we are proposing to modify the proposed incorporation by 
reference regulatory text at 40 CFR 98.7(g) consistent with these 
proposed revisions, such that the regulatory text would also reference 
paragraphs 40 CFR 98.470(c) and 98.481(c).

B. Subpart C--General Stationary Fuel Combustion

    For the reasons described in section II.D of this preamble, we are 
proposing to add requirements for facilities under subpart C of part 98 
(General Stationary Fuel Combustion) to report whether the unit is an 
electricity generating unit (EGU) for each configuration that reports 
emissions under either the individual unit provisions at 40 CFR 
98.36(b) or the multi-unit provisions at 40 CFR 98.36(c). Additionally, 
for multi-unit reporting configurations, we are proposing to add 
requirements for facilities to report an estimated decimal fraction of 
total emissions from the group that are attributable to EGU(s) included 
in the group.

[[Page 32873]]

    Under the current subpart C reporting requirements, the EPA cannot 
determine the quantity of EGU emissions included in the reported total 
emissions for the subpart. The proposed changes would allow the EPA to 
estimate the EGU emissions included in the subpart C emission totals. 
Understanding subpart C EGU GHG emissions is important to ensure more 
accurate data analysis, to understand attribution of GHG emissions to 
the power plant sector, and to inform policy goals under the CAA. For 
example, the EPA's current data publication products attribute subpart 
C emissions to the power plant sector based on the reported NAICS code 
for the facility. However, some manufacturing facilities, such as 
petroleum refineries and pulp and paper manufacturers, operate 
stationary combustion sources that generate electricity. Reporting of 
an EGU indicator for these units would allow the EPA to assign the 
emissions from any electricity generating units at the facility more 
appropriately to the power plant sector. Similarly, data analyses, 
including those used for policy development, would be able to use the 
EGU indicator to ensure a more comprehensive EGU data set was used.
    We do not anticipate that the proposed data elements would require 
any additional monitoring or data collection by reporters, because the 
only added data elements would be whether any subpart C unit(s) 
included in the report are EGU(s), and, for multi-unit configurations, 
an estimated fraction of total emissions from the group that are 
attributable to EGU(s) included in the group. I proposed changes would 
result in minimal additional burden to reporters because the reporter 
knows if the unit is an EGU and, if so, the estimated fraction of total 
emissions attributable to the EGU can be determined by engineering 
estimates. We are also proposing related confidentiality determinations 
for the additional data elements, as discussed in section VI of this 
preamble.

C. Subpart F--Aluminum Production

    For the reasons described in section II.D of this preamble, we are 
proposing to revise the reporting requirements of subpart F of part 98 
(Aluminum Production). We are proposing to revise the reporting 
requirements at 40 CFR 98.66(a) and (g) to require that facilities 
report the facility's annual production capacity and annual days of 
operation for each potline. The capacity of the facility and capacity 
utilization would provide useful information for understanding 
variations in annual emissions, to understand trends across the sector 
and to support analysis of this source. We often contact facilities 
seeking to understand yearly variations in the facility emissions, and 
facilities explain that the variation was due to a smelter not 
operating for a particular time period. Currently it is difficult to 
determine without correspondence with the facility whether variations 
in emissions are due to changes in yearly production or efforts to 
improve operations to decrease emissions. If data on the production 
capacity and annual days of operation for each potline are included in 
the annual report, it could explain the variation and eliminate the 
need for correspondence with facilities. We are also proposing related 
confidentiality determinations for the additional data elements, as 
discussed in section VI of this preamble.

D. Subpart G--Ammonia Manufacturing

    For the reasons described in section II.D of this preamble, we are 
proposing a revision to the reporting requirements of subpart G of part 
98 (Ammonia Manufacturing) to enhance the quality and accuracy of the 
data collected under the GHGRP. As discussed in section III.G of this 
preamble, to increase the GHGRP's coverage of facilities in the 
hydrogen production sector we are proposing to amend the applicability 
of subpart P (Hydrogen Production) to include all facilities that 
produce hydrogen gas as a product regardless of whether the product is 
sold, with exemptions for any process unit for which emissions are 
reported under another subpart of part 98, including ammonia production 
units that report emissions under subpart G. However, we are proposing 
to amend subpart G in this action to include a reporting requirement 
for facilities to report the annual quantity of excess hydrogen 
produced that is not consumed through the production of ammonia. This 
change would ensure that revisions to subpart P to exclude reporting 
from facilities that are subject to subpart G would not result in the 
exclusion of reporting of any excess hydrogen production at facilities 
that are subject to subpart G from the GHGRP. The proposed revision 
would also help the EPA to understand facilities that engage in captive 
hydrogen production and better inform our knowledge of industry 
emissions and trends. We are also proposing related confidentiality 
determinations for the additional data element, as discussed in section 
VI of this preamble.

E. Subpart I--Electronics Manufacturing

    We are clarifying a proposed revision to Table I-16 to subpart I of 
part 98 (Electronics Manufacturing) to correct a typographical error in 
the 2022 Data Quality Improvements Proposal. The June 21, 2022 proposed 
rule's amendatory text shows the current DRE for NF3 of 88 
percent instead of the DRE proposed of 96 percent. The DRE calculated 
for NF3 is 96 percent based on data submitted to the EPA, as 
shown in the supplemental material ``combined DRE data sets.xlsx'' in 
the docket for the proposed rule. For more information on the how the 
DREs were calculated, see the preamble to the 2022 Data Quality 
Improvements Proposal and the memorandum, Revised Technical Support for 
Revisions to Subpart I: Electronics Manufacturing, available in the 
docket for this rulemaking, Docket Id. No. EPA-HQ-OAR-2019-0424.
    We are also proposing revisions to Table I-18 to subpart I of part 
98 to correct the proposed gamma factors to estimate by-products for 
NF3 used in remote plasma cleaning for facilities 
manufacturing both wafers <= to 200 mm and 300 mm or greater. The by-
product gamma for CHF3, CH2F2 and 
CH3F for facilities manufacturing both wafer sizes should be 
equal to the by-product gamma factor for 300 mm and not an average of 
the 200 mm gamma (which is zero) and the 300 mm gamma. More information 
can be found in the revised technical support document (TSD), Revised 
Technical Support for Revisions to Subpart I: Electronics 
Manufacturing, available in the docket for this rulemaking (Docket Id. 
No. EPA-HQ-OAR-2019-0424).

F. Subpart N--Glass Production

    For the reasons described in section II.D of this preamble, we are 
proposing revisions to the recordkeeping and reporting requirements of 
subpart N of part 98 (Glass Production) to enhance the quality and 
accuracy of the data collected under the GHGRP. We are proposing to 
revise the existing reporting and recordkeeping requirements for both 
CEMS and non-CEMS facilities to require that they report and maintain 
records of recycled scrap glass (cullet) used as a raw material. 
Specifically, we are proposing to add provisions to 40 CFR 98.146 to 
require reporting of the annual quantity of cullet used (in tons) in 
each continuous glass melting furnace and in all furnaces combined by 
glass type (e.g., container, flat glass, fiber glass, or specialty 
glass). This quantity would include both recycled glass that was 
brought in from other facilities or purchased from external sources 
(e.g., recycling programs) and glass that has been produced at the 
facility and then added back into the production process (sometimes 
referred to as ``run-

[[Page 32874]]

around''). We are also proposing to add provisions to 40 CFR 98.147 to 
require recordkeeping of the monthly quantity of cullet used (in tons) 
in each continuous glass melting furnace by product type (e.g., 
container, flat glass, fiber glass, or specialty glass), and the number 
of times in the reporting year that missing data procedures were used 
to measure monthly quantities of cullet used.
    Although there are variations in the types of carbonates used at 
different facilities and some facilities use other carbonate raw 
materials in much smaller quantities, the major raw materials (i.e., 
fluxes and stabilizers) that emit process-related CO2 
emissions in glass production are limestone, dolomite, and soda ash. In 
general, the composition profile of raw materials is relatively 
consistent among individual glass types, however, some facilities use 
cullet in their production process. Unlike carbonate-based raw 
materials, cullet does not produce process GHG emissions when used in 
the glass production process. Therefore, differences in the quantities 
of cullet used can lead to variations in emissions from the production 
of different glass types. Furthermore, the production of some glass 
types (e.g., container, flat glass, fiber glass, specialty glass) 
consumes more cullet than others. The amount of cullet used at 
individual facilities can also vary from year to year, which can cause 
related changes in emissions. Additionally, due to its lower melting 
temperature, mixing cullet with other raw materials can reduce the 
amount of energy required to produce glass and thus also reduce 
combustion emissions related to glass production.
    The annual quantities of cullet used would provide a useful metric 
for understanding variations and differences in emissions estimates 
that may not be apparent in the existing data collected, improve our 
understanding of industry trends, and improve verification for the 
GHGRP. The proposed data elements would also provide useful information 
to improve analysis of this sector in the Inventory. As noted in the 
2019 Inventory report,\31\ the EPA reviews the GHGRP data during the 
development of inventory estimates for this sector to help understand 
the completeness of emission estimates and for quality control. 
Including cullet use would increase the transparency and accuracy of 
the data set produced by the Inventory. Additionally, collecting more 
detailed data on raw materials would improve analysis of this sector by 
other EPA programs.
---------------------------------------------------------------------------

    \31\ See Inventory of U.S. Greenhouse Gas Emissions and Sinks: 
1990-2017 (2019), available at www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks-1990-2017.
---------------------------------------------------------------------------

    While we are proposing to collect the sum of both externally-
sourced recycled glass and facility ``run-around'' recycled glass, we 
seek comment on the degree to which each of these types of recycled 
glass are tracked by facilities, and/or what kinds of cullet use data 
are readily available. Furthermore, we seek comment on the degree to 
which recycled glass use is tracked by produced glass type, and whether 
it is common for a glass melting furnace to be used to produce more 
than one glass type in a reporting year. We do not anticipate that the 
proposed data elements would require any additional monitoring or data 
collection by reporters, as cullet use data are likely available in 
existing company records. The proposed changes would therefore result 
in minimal additional burden to reporters. We are also proposing 
related confidentiality determinations for the additional data 
elements, as discussed in section VI of this preamble.

G. Subpart P--Hydrogen Production

    The EPA is proposing several amendments to subpart P of part 98 
(Hydrogen Production) that include expanding the source category to 
include non-merchant hydrogen production facilities, as well as 
clarifications and additions to the reporting elements resulting in 
enhanced unit-level reporting for facilities in the hydrogen production 
sector. As discussed in sections II.B and II.D of this preamble, these 
amendments would address potential gaps in applicability and reporting, 
allowing the EPA to better understand and track facilities and 
emissions. These data would inform future policy considerations under 
the CAA, and additionally could inform future policy considerations 
like those set forth by other Government programs.
    Currently, section 98.160 states, ``A hydrogen production source 
category consists of facilities that produce hydrogen gas sold as a 
product to other entities.'' This provision notably limits 
applicability to so-called ``merchant'' plants that sell hydrogen 
produced as a product. Based on requirements in subpart Y of part 98 
(Petroleum Refineries), hydrogen production units at petroleum 
refineries are required to report hydrogen production GHG emissions 
under subpart P even though they do not sell the hydrogen gas to other 
entities. Similarly, subpart G of part 98 (Ammonia Manufacturing) 
essentially provides calculation methodologies analogous to subpart P 
to account for GHG emissions from ammonia production, which entails the 
use of captive hydrogen production. However, through external analysis 
and communications with facilities reporting to the GHGRP, we 
understand that there are other facilities that produce hydrogen and 
consume it onsite (i.e., captive plants), that are not required to 
report their hydrogen production GHG emissions under subpart P or any 
other GHGRP subpart. To increase the GHGRP's coverage of facilities in 
the hydrogen production sector, we are proposing to amend the source 
category definition in 40 CFR 98.160 to include all facilities that 
produce hydrogen gas as a product regardless of whether the product is 
sold. We are also proposing to categorically exempt any process unit 
for which emissions are reported under another subpart of part 98. This 
includes, but is not necessarily limited to, ammonia production units 
that report emissions under subpart G of part 98, catalytic reforming 
units located at petroleum refineries that produce hydrogen as a by-
product for which emissions are reported under subpart Y of part 98, 
and petrochemical production units that report emissions under subpart 
X of part 98 (Petrochemical Production). We are also proposing to 
exempt process units that only separate out diatomic hydrogen from a 
gaseous mixture and are not associated with a unit that produces 
diatomic hydrogen created by transformation of one or more feedstocks, 
which would codify the existing interpretation currently included in 
FAQ #695.\32\ We note that the EPA is also proposing to amend subpart G 
of part 98 in this action to include a reporting requirement for 
facilities to report the annual quantity of excess hydrogen produced 
that is not consumed through the production of ammonia (see section 
III.C of the preamble for additional details).
---------------------------------------------------------------------------

    \32\ See GHGRP FAQ #695 ``What is a hydrogen production process 
unit?'' Available at: https://ccdsupport.com/confluence/pages/viewpage.action?pageId=173080687.
---------------------------------------------------------------------------

    Additionally, the EPA is proposing to amend the source category 
definition to clarify that stationary combustion sources that are part 
of the hydrogen production unit (e.g., the reforming furnace and 
hydrogen production process unit heater) are part of the hydrogen 
production source category and that their emissions are to be reported 
under subpart P. Depending on the configuration of the hydrogen 
production unit, the exhaust gases from

[[Page 32875]]

the combustion of fuel used to raise the temperature of the feedstocks 
and supply energy needed for the transformation reaction may be emitted 
through the same stack as the ``process'' emissions (i.e., 
CO2 produced from the transformation of feedstocks) or 
through separate stacks. Currently, 40 CFR 98.162 requires reporting of 
GHG emissions ``from each hydrogen production process unit'' under 
subpart P and reporting of GHG emissions from ``each stationary 
combustion unit other than hydrogen production process units'' under 
subpart C of part 98 (General Stationary Fuel Combustion Sources). This 
has led to some confusion regarding whether hydrogen production unit 
furnaces or process heaters that exhaust through a separate stack than 
the process emissions should be reported under subpart P or subpart C 
of this part. This proposed amendment to the source category definition 
seeks to clarify that these furnaces or process heaters are part of the 
hydrogen production process unit regardless of where the emissions are 
exhausted. We are also proposing to clarify that, if a hydrogen 
production unit with separate stacks for ``process'' emissions and 
``combustion'' emission uses a CEMS for the process emissions stack, 
reporters must calculate and report the CO2 emissions from 
the hydrogen production unit's fuel combustion using the mass balance 
equations in subpart P (equations P-1 through P-3) in addition to the 
CO2 emissions measured by the CEMS. Although this 
circumstance is expected to be rare, these amendments are necessary to 
clarify the reporting requirements for cases where hydrogen production 
process and combustion emissions are emitted through separate stacks. 
These amendments also allow for a more direct comparison of the GHG 
emission intensities for hydrogen production units using single versus 
dual stack configurations.
    Hydrogen production can be achieved through a variety of chemical 
processes including the use of steam methane reforming (SMR), SMR 
followed by water gas shift (WGS) reaction, partial oxidation (POX), 
POX followed by WGS, and water or brine electrolysis. Each chemical 
production process has different yields of hydrogen and, depending on 
the desired product, the product stream may require purification. There 
are different purification processes that most commonly include 
pressure swing adsorption (PSA), amine adsorption, or membrane 
separation. Similar to the chemical production process, each 
purification process may yield products of different hydrogen purity 
and have different energy requirements. It is also worth noting that 
some hydrogen plants may perform purification of hydrogen that is 
included in the feedstock entering the plant. An example would be a 
refinery that directs the exhaust gas from a process unit that has 
elevated levels of hydrogen to its hydrogen plant. In this case, the 
hydrogen plant acts to both ``produce hydrogen'' (by reforming, 
gasification, oxidation, reaction, or other feedstock transformations) 
and ``purify hydrogen'' that exists in the feedstock to the plant. That 
is, the total quantity of hydrogen exiting the hydrogen plant may 
consist of hydrogen chemically produced (and subsequently purified) 
within the unit as well as hydrogen merely purified by the unit.
    For the reasons described in section II.D of this preamble, in 
order to best understand the reported data, we are proposing to add 
requirements for facilities to the report the process type for each 
hydrogen production unit (i.e., SMR, SMR-WGS, POX, POX-WGS, Water 
Electrolysis, Brine Electrolysis, or Other (specify)), the purification 
type for each hydrogen production unit (i.e., PSA, Amine Adsorption, 
Membrane Separation, Other (specify), or none), and the annual quantity 
of hydrogen that is only purified by each hydrogen production unit. We 
note that subpart P currently requires reporting of the quantity of 
hydrogen that is produced by each hydrogen production unit. We intended 
this quantity to only include that quantity of hydrogen produced in the 
unit by reforming, gasification, oxidation, reaction, or other 
transformations of feedstocks. Through verification efforts, we 
identified some facilities that were reporting the total quantity of 
hydrogen exiting the hydrogen production unit, not just the quantity of 
hydrogen produced within the unit via reforming, gasification, 
oxidation, reaction, or other transformations of feedstocks. We could 
identify these facilities because the ratio of hydrogen produced to 
feedstock consumed was outside of the expected range. We developed and 
posted a frequently asked question (FAQ #698) \33\ to clarify this 
reporting element, but some reporters may still be reporting their 
combined quantity of hydrogen produced plus the quantity of hydrogen 
merely purified. In addition to proposing to add the annual quantity of 
hydrogen that is only purified by each hydrogen production unit, we are 
also proposing to clarify that the current reporting requirement is the 
annual quantity of hydrogen that is produced ``. . . by reforming, 
gasification, oxidation, reaction, or other transformations of 
feedstocks.''
---------------------------------------------------------------------------

    \33\ See GHGRP FAQ #698 ``How do I determine the quantity of 
hydrogen produced?'' Available at: https://ccdsupport.com/confluence/pages/viewpage.action?pageId=173080692.
---------------------------------------------------------------------------

    We are also proposing to amend the current reporting requirement in 
40 CFR 98.166(c) regarding the facility-level quantity of 
CO2 that is collected and transferred offsite to require the 
quantity of CO2 collected and transferred offsite to be 
reported on a unit-level. This is consistent with other revisions 
proposed in subpart P in the 2022 Data Quality Improvements Proposal 
(e.g., mass of non-CO2 carbon (excluding methanol) collected 
and transferred offsite) and would allow the EPA to perform unit-level 
analyses. We are also proposing to require reporting of the annual net 
quantity of steam consumed by the unit, which would be a positive 
quantity if the hydrogen production unit is a net steam user (i.e., 
uses more steam than it produces) and a negative quantity if the 
hydrogen production unit is a net steam producer (i.e., produces more 
steam than it uses). Together, these proposed additional, amended, and 
clarified reporting requirements would enable us to perform 
benchmarking across process types at the unit-level, conduct more 
rigorous verification of the reported data, better understand 
production quantities, and collect more comprehensive and accurate data 
to inform future policy decisions.
    Because we are proposing to require all data elements be reported 
at the unit level, we are also proposing to reorganize and consolidate 
all of the reporting elements reported at the unit level under 40 CFR 
98.166(b) regardless of the calculation method (i.e., mass balance or 
CEMS). We are also proposing reporters provide the emissions 
calculation method used (CEMS for single hydrogen production unit; CEMS 
on a common stack for multiple hydrogen production units; CEMS on a 
common stack with hydrogen production unit(s) and other sources; CEMS 
measuring process emissions alone plus mass balance for hydrogen 
production unit fuel combustion using equations P-1 through P-3; mass 
balance using equations P-1 through P-3 only; mass balance using 
equations P-1 through P-4). If a common stack CEMS is used, either for 
multiple hydrogen production units or that includes emissions from 
other sources, we are proposing to require that the estimated fraction 
of CO2 emissions attributable to each hydrogen production 
unit be reported so

[[Page 32876]]

we can estimate unit-level CO2 emissions for each hydrogen 
production unit. The revisions in 40 CFR 98.166(b) also require a 
proposed revision to 40 CFR 98.167(b) to broaden the recordkeeping 
requirements related to elements reported under 40 CFR 98.166(b).
    We are also proposing to remove and reserve the recordkeeping 
requirements in 40 CFR 98.167(c). We determined that these 
recordkeeping requirements at 40 CFR 98.167(c)(1) are redundant to the 
general requirements already specified in 40 CFR 98.3(g) and that the 
requirements at 40 CFR 98.167(c)(2) and (3) are not applicable to 
hydrogen production units using the calculation method in 40 CFR 
98.163(b).
    We anticipate that the proposed data elements would require some 
additional monitoring or data collection by reporters. First, we are 
proposing to add several reporting elements to better characterize the 
type of hydrogen production unit and the type of associated 
purification process used. This information is readily available by 
hydrogen production unit owners or operators, so the data collection 
effort would be minimal and would not require any additional 
monitoring. We are also proposing to require reporting of emission and 
activity on a process unit basis, some of which was previously required 
only at the facility level. For reporters with multiple hydrogen 
production units, this may lead to a slight increase in the data 
collected by reporters. Finally, by proposing to broaden the source 
category to include captive hydrogen production units, there may be new 
reporters under subpart P. We expect that the number of new reporters 
would be small, because captive hydrogen production units at petroleum 
refineries were already required to report under subpart P due to 
requirements in subpart Y. However, there may be additional captive 
hydrogen production units that would newly have to report under subpart 
P and these reporters would have additional monitoring or data 
collection requirements. The proposed changes would therefore result in 
minimal additional burden to current subpart P reporters and more 
substantive additional burden to new reporters to subpart P. We are 
also proposing related confidentiality determinations for the 
additional data elements, as discussed in section VI of this preamble.
    Due to the expected importance of hydrogen in future energy supply, 
the EPA is considering additional revisions to subpart P. The first 
revision would be to make subpart P an ``all-in'' subpart, such that 
any facility meeting the definition of the hydrogen production source 
category at 40 CFR 98.160 would be required to report under the GHGRP. 
This would entail moving subpart P from Table A-4 to Table A-3 so that 
it would no longer be subject to the 25,000 mtCO2e 
applicability threshold at 40 CFR 98.2(a)(2). The purpose of this 
potential revision would be to collect information on hydrogen 
production facilities that use electrolysis or other production methods 
that may have small direct emissions but use relatively large 
quantities of offsite energy to power the process. So, although the 
emissions occurring onsite at these hydrogen production facilities may 
fall below the current applicability threshold, the combined direct 
emissions (i.e., ``scope 1'' emissions) and emissions attributable to 
energy consumption (i.e., ``scope 2'' emissions) \34\ could be 
significant. These considerations are especially important in 
understanding hydrogen as a fuel source. The EPA is aware of two 
concerns with this potential revision. First, it may be burdensome to 
small hydrogen producers. Second, even if small producers were 
exempted, the remaining newly applicable facilities (i.e., those that 
have small direct emissions but use large quantities of offsite energy) 
may be eligible to cease reporting after three to five years, resulting 
in a limited data set.
---------------------------------------------------------------------------

    \34\ See section IV.A.1 of this preamble for additional 
information on the EPA's collection of data related to energy 
consumption.
---------------------------------------------------------------------------

    To address the first concern, the EPA is considering including a 
minimum annual hydrogen production quantity within the subpart P source 
category definition to limit the applicability of the subpart to larger 
hydrogen production facilities. The current 25,000 mtCO2e 
threshold for subpart P translates to the production of approximately 
2,500 metric tons (mt) of hydrogen for a steam methane reformer, a 
process which typically produces approximately 10 mt CO2 per 
mt of hydrogen produced. We request comment on updating the subpart P 
source category definition to require reporting from hydrogen 
production processes that exceed a 2,500 mt hydrogen production 
threshold or other metric rather than a production threshold. We 
request comment on the appropriate production threshold and other 
approaches for revising the source category definition while also 
excluding small producers.
    Regarding the second concern, 40 CFR 98.2(i) enables reporters to 
``off-ramp'' (stop reporting) after three years if their emissions are 
under 15,000 mtCO2e or after five years if their emissions 
are between 15,000 and 25,000 mtCO2e. As discussed above, 
EPA anticipates that hydrogen production facilities that use 
electrolysis or other production methods that may have smaller direct 
emissions (i.e., scope 1 emissions) would likely qualify to cease 
reporting after three to five years. We are seeking comment on 
potential options for how we could require continued reporting for the 
newly applicable subpart P reporters when a reporter would normally be 
eligible to stop reporting, to enable collection of a more 
comprehensive data set over time. Two examples of how this could be 
accomplished would be to exempt subpart P reporters from the provisions 
at 40 CFR 98.2(i) or develop a subpart P-specific off-ramp provision 
tied to hydrogen production levels consistent with the potential 
revised source category definition.
    Finally, the EPA is considering revising subpart P to require 
hydrogen production facilities to report the quantity of hydrogen 
provided to each end-user (including both onsite use and delivered 
hydrogen) and, if the end-user reports to GHGRP, the GHGRP ID for that 
customer. Because hydrogen production can be GHG intensive, we consider 
it important to understand the demand for and use of hydrogen for 
carrying out a wide variety of CAA provisions. We request comment on 
the approach to collecting this sales information and the burden such a 
requirement may impose. One potential option would be to limit the 
reporting requirement to bulk hydrogen sales, and we request comment on 
the quantity of hydrogen that should qualify as bulk under this 
scenario. In addition, the EPA anticipates that some facilities may 
deliver hydrogen to a pipeline and may not know the end customers for 
these deliveries. However, the EPA anticipates that this situation 
could be mitigated by only requiring facilities to report information 
on sales where the customers are known to the facility.

H. Subpart Y--Petroleum Refineries

    We are proposing several amendments to subpart Y of part 98 
(Petroleum Refineries) that would provide clarification and consistency 
to the rule requirements.
    First, for the reasons described in section II.B of this preamble, 
we are proposing to delete reference to non-merchant hydrogen 
production plants in paragraph 40 CFR 98.250(c) and to delete and 
reserve paragraphs 40 CFR 98.252(i), 98.255(d), and 98.256(b). We are 
proposing these deletions because of

[[Page 32877]]

the proposed revisions to subpart P of part 98 (Hydrogen Production) 
that broaden the applicability of subpart P beyond merchant hydrogen 
production units. Hydrogen production units collocated at petroleum 
refineries would continue to have their emissions reported under 
subpart P, but subpart Y would no longer have to specifically require 
the non-merchant hydrogen production units to be reported under subpart 
P because subpart P would directly apply to these units.
    Second, we are proposing to delete reference to coke calcining 
units in paragraphs 40 CFR 98.250(c) and 98.257(b)(16) through (19) and 
to remove and reserve paragraphs 40 CFR 98.252(e), 98.253(g), 
98.254(h), 98.254(i), 98.256(i), and 98.257(b)(27) through (31). We are 
proposing these removals because of the proposed addition of subpart WW 
to part 98 (Coke Calciners) (see section IV.B of this preamble for 
additional information). With the addition of subpart WW, these 
provisions would no longer be necessary in subpart Y. Facilities with 
coke calciners would report their coke calcining unit emissions in the 
new proposed subpart WW, therefore maintaining these requirements in 
subpart Y would be duplicative.
    Third, for the reasons described in section II.D of this preamble, 
we are proposing to include a requirement to report the capacity of 
each asphalt blowing unit. Unlike other emission units subject to 
reporting in subpart Y, asphalt blowing units currently do not have a 
reporting requirement for the unit-level capacity. Consistent with the 
existing reporting requirements for other emissions units under subpart 
Y, we are proposing to include a requirement for the maximum rated 
unit-level capacity of the asphalt blowing unit, measured in mt of 
asphalt per day, in 40 CFR 98.256(j)(2). These data would be used by 
the EPA for emissions analysis, data normalization, benchmarking, and 
emissions verification.
    We do not anticipate that the proposed data elements would require 
any additional monitoring or data collection by reporters, because the 
only added data element is the capacity of each asphalt blowing unit, 
which is expected to be readily available on the equipment or in the 
operating permit for the unit. The proposed changes would therefore 
result in minimal additional burden to reporters. We are also proposing 
related confidentiality determinations for the additional data element, 
as discussed in section VI of this preamble.

I. Subpart AA--Pulp and Paper Manufacturing

    For the reasons described in section II.C of this preamble, the EPA 
is proposing to amend specific provisions in the GHG Reporting Rule to 
require additional calculation requirements under subpart AA of part 98 
(Pulp and Paper Manufacturing). We are proposing to revise 40 CFR 
98.273 to include calculation requirements for the combustion of 
biomass fuels from Table C-1 to subpart C of part 98 (General 
Stationary Fuel Combustion Sources) and for the combustion of biomass 
with other fuels for each reported unit-type. For the units reported 
under this subpart, the rule currently includes methodologies to 
calculate CO2, CH4 and N2O emissions 
from the combustion of fossil fuels, and CH4, N2O 
and biogenic CO2 emissions from the combustion of spent 
liquor solids. However, there is no calculation methodology provided 
for a scenario in which biomass other than spent liquor solids are 
fired within a unit or co-fired or blended with fossil fuels. 
Therefore, we are proposing to revise 40 CFR 98.273 to include 
methodologies to calculate CH4, N2O and biogenic 
CO2 emissions from the combustion of biomass fuels other 
than spent liquor solids, as well as the combustion of biomass other 
than spent liquor solids with other fuels, according to the applicable 
methodology from the provisions for stationary combustion sources found 
at 40 CFR 98.33(a), 40 CFR 98.33(c), and 40 CFR 98.33(e).
    For the reasons described in section II.E of this preamble, we are 
also proposing to revise the subpart AA reporting requirements at 40 
CFR 98.276(a) to remove references to biogenic CH4 and 
biogenic N2O. These terms have no meaning in the rule as 
CH4 and N2O are treated the same whether from 
biomass or fossil fuel combustion. This change aligns subpart AA with 
the terminology used for stationary combustion sources in subpart C and 
other combustion emissions throughout the rule.
    Lastly, we are proposing to correct a typographical error at 40 CFR 
98.277(d) by revising ``detemining'' to ``determining''.

J. Subpart HH--Municipal Solid Waste Landfills

    For the reasons described in sections II.B and II.C of this 
preamble, we are proposing several revisions to subpart HH of part 98 
(Municipal Solid Waste Landfills) to improve the quality of data 
collected under the GHGRP. First, for the reasons described in section 
II.B of this preamble, we are proposing to account for methane 
emissions from large release events that are currently not quantified 
under the GHGRP. In light of recent aerial studies indicating that 
methane emissions from landfills may be considerably higher than 
methane emissions quantified/reported under subpart HH,\35\ the EPA 
reviewed the current subpart HH equations and available literature \36\ 
to determine methods by which the subpart HH calculation methodologies 
could be modified or improved to account for these high emission 
events, particularly for landfills with gas collection systems. The 
following three likely reasons for high emission events were 
identified: (1) a poorly operating or non-operating gas collection 
system; (2) a poorly operating or non-operating destruction device; and 
(3) a leaking cover system due to cracks, fissures, or gaps around 
protruding wells. With respect to a poorly operating or non-operating 
gas collection system, equations HH-7 and HH-8 account for this in the 
``fRec'' term (i.e., the fraction of annual operating hours 
the associated recovery system was operating). In reviewing equations 
HH-7 and HH-8, we realized that the equations suggest that the 
fRec term is a function of the measurement location. For the 
reasons described in section II.C of this preamble, we are proposing 
revisions to equations HH-7 and HH-8 to more clearly indicate that the 
fRec term is dependent on the gas collection system. This 
proposed revision clarifies how the equation should apply to landfills 
that may have more than one gas collection system and may have multiple 
measurement locations associated with a single gas collection system. 
For the reasons discussed in section II.B of this preamble, we are also 
proposing that recovery system operating hours would only include those 
hours when the system is operating normally. We are proposing that 
facilities would not include hours when the system is shut down or when 
the system is poorly operating (i.e., not operating as intended). We 
anticipate that poorly operating systems could be identified when 
pressure, temperature, or other parameters indicative of system 
performance are outside of normal variances for a significant portion 
of the system's gas collection wells. We are

[[Page 32878]]

seeking comment on what set of parameters should be used to identify 
these poorly operating periods and whether a threshold on the 
proportion of wells operating outside of their normal operating 
variance should be included in the definition of the fRec 
term to define these periods of poor performance, which we are 
proposing to exclude from the ``normal'' operating hours. With respect 
to a poorly operating or non-operating destruction device, equations 
HH-6, HH-7 and HH-8 account for this in the ``fDest'' term 
(i.e., the fraction of annual hours the destruction device was 
operating). We are also proposing revisions to fDest to 
clarify that the destruction device operating hours exclude periods 
when the destruction device is poorly operating. We are proposing that 
facilities should only include those periods when flow was sent to the 
destruction device and the destruction device was operating at its 
intended temperature or other parameter that is indicative of effective 
operation. For flares, we are proposing that periods when there is no 
pilot flame would be considered a poorly operating period that is 
excluded from destruction device operating hours. The proposed 
revisions would ensure that the equations account for emissions from 
periods in which the gas collection systems or destruction devices are 
poorly operating or non-operating.
---------------------------------------------------------------------------

    \35\ Duren, R.M., et al. 2019. ``California's methane super-
emitters.'' Nature 575, 180-184. 7 November 2019. Available at: 
https://doi.org/10.1038/s41586-019-1720-3.
    \36\ See Technical Support for Supplemental Revisions to Subpart 
HH: Municipal Solid Waste Landfills, available in the docket for 
this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    With respect to emissions from leaking cover systems due to cracks, 
fissures, or gaps around protruding wells, these issues would reduce 
the landfill gas collection efficiency and would also reduce the 
fraction of methane oxidized near the surface of the landfill. We found 
that equations HH-6, HH-7, and HH-8 do not directly account for periods 
where surface issues reduce the gas collection efficiency and/or reduce 
the fraction of methane oxidized. Owners or operators of landfills with 
gas collection systems subject to the control requirements in the NSPS 
as implemented in 40 CFR part 60, subpart WWW or XXX, EG in 40 CFR part 
60, subparts Cc or Cf as implemented in approved state plans, or 
Federal plans as implemented at 40 CFR part 62, subparts GGG or OOO 
must operate the gas collection system so that the methane 
concentration is less than 500 parts per million above background at 
the surface of the landfill. To demonstrate compliance with this 
requirement, landfill owners or operators must monitor surface 
concentrations of methane along the entire perimeter of the collection 
area and along a pattern that traverses the landfill at 30-meter 
intervals for each collection area on a quarterly basis using an 
organic vapor analyzer, flame ionization detector, or other portable 
monitor meeting the rule's specifications. The probe inlet must be 
placed within 5 to 10 centimeters of the ground. Any reading of 500 
parts per million or more above background at any location must be 
recorded as a monitored exceedance and corrective actions must be 
taken.
    Considering the applicability of the landfill NSPS (40 CFR part 60, 
subpart WWW or XXX), state plans implementing the EG (40 CFR part 60, 
subparts Cc or Cf), or Fplans (40 CFR part 62, subparts GGG or OOO), we 
estimate that more than 70 percent of landfills with gas collection 
systems must make these surface measurements. Data presented by Heroux, 
et al.,\37\ suggests that the methane flux is proportional to the 
measured methane concentration at 6 centimeters above the ground. We 
are proposing to add a term to equations HH-6, HH-7, and HH-8 based on 
this correlation to adjust the estimated methane emissions for 
monitoring exceedances. We are proposing to add surface methane 
concentration monitoring methods at 40 CFR 98.344(g) commensurate with 
the monitoring requirements in the landfill NSPS, EG, or Federal plans. 
We are proposing to require landfill owners and operators that must 
already conduct these surface measurements to conduct the measurements 
as specified in 40 CFR 98.344(g), provide a count of the number of 
exceedances identified during the required surface measurement period, 
including exceedances when re-monitoring (if re-monitoring is 
conducted), and use an additional equation term to adjust the reported 
methane emissions to account for these exceedances. For more 
information on the assessment of landfills subject to the NSPS, state 
plans implementing the EG, or Federal plan and the development of the 
additional equation term, see Technical Support for Supplemental 
Revisions to Subpart HH: Municipal Solid Waste Landfills, available in 
the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    \37\ Heroux, M., C. Guy, and D. Millete. 2010. ``A Statistical 
Model for Landfill Surface Emissions.'' Journal of the Air & Waste 
Management Association, 60:2, 219-228. https://doi.org/10.3155/1047-3289.60.2.219.
---------------------------------------------------------------------------

    Comments received on the 2022 Data Quality Improvements Proposal 
cited a Maryland study in which the collection efficiencies for non-
regulated landfills were 20 percent lower, on average, than for 
regulated landfills (i.e., subject to NSPS, state plans implementing 
EG, or Federal plan).\38\ These results make sense because the 
objective of the surface methane concentration measurements are to 
ensure proper gas collection and non-regulated landfills that do not 
conduct these measurements would not necessarily have such checks in 
place and may be expected to have higher emissions. However, the 
landfill gas collection efficiency for a given landfill depends on 
numerous factors. Specifically, the subpart HH calculation methodology 
will yield different average gas collection efficiencies based on the 
relative area of the landfill affected by the gas collection system and 
the type of soil cover used in those areas affected by the gas 
collection system, as provided in Table HH-3 to subpart HH of part 98. 
Therefore, we reviewed the Maryland study data and compared the 
Maryland study data results with the collection efficiencies reported 
under subpart HH (for Maryland landfills also reporting to the GHGRP). 
For the subset of Maryland landfills also reporting to the GHGRP, the 
Maryland study gas collection efficiencies for non-regulated landfills 
was 20 percent lower than for regulated landfills, which is consistent 
with the findings using the full set of Maryland landfills. However, 
the GHGRP reported gas collection efficiencies for non-regulated 
landfills in Maryland were 10 percent lower than for regulated 
landfills. Thus, it appears that some of the observed differences in 
the gas collection efficiencies for the Maryland landfills may already 
be accounted for by the subpart HH calculation methodology. If the 
default gas collection efficiencies provided in Table HH-3 were 10 
percent lower than the existing values for non-regulated landfills, the 
GHGRP calculated collection efficiencies would agree with the 20 
percent overall differences observed in the Maryland study. For more 
detail regarding our review of the Maryland study data, see Technical 
Support for Supplemental Revisions to Subpart HH: Municipal Solid Waste 
Landfills, available in the docket for this rulemaking (Docket Id. No. 
EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    \38\ Environmental Integrity Project. Public Comments on Docket 
Id. No. EPA-HQ-OAR-2019-0424, Revisions and Confidentiality 
Determinations for Data Elements Under the Greenhouse Gas Reporting 
Rule, Proposed Rule, 87 FR 36920 (June 21, 2022).
---------------------------------------------------------------------------

    Based on our review of the Maryland study data along with the 
existing methodologies in subpart HH, we are proposing to include a new 
set of gas collection efficiency values in Table HH-3 that are 
applicable to landfills that do not conduct surface methane

[[Page 32879]]

concentration measurements (i.e., facilities that are not subject to 
the landfill NSPS, EG, or Federal plan or that do not elect to monitor 
their landfill cover according to the landfill rule requirements at 40 
CFR 98.344(g)(7)). These new factors are 10 percent lower than the 
current values in Table HH-3. We are proposing to also retain the 
current set of collection efficiencies, but to modify the provision 
such that these values would only be applicable for landfills that are 
conducting surface methane concentration measurements according to the 
landfills rule requirements. We are proposing that facilities that are 
not subject to the landfill NSPS (40 CFR part 60, subpart WWW or XXX), 
state plans implementing the EG (40 CFR part 60, subparts Cc or Cf), or 
Federal plans (40 CFR part 62, subparts GGG or OOO) must either: (1) 
use the proposed lower gas collection efficiency values; or (2) monitor 
their landfill cover and use the current set of collection efficiency 
values. We are also proposing to add surface methane concentration 
monitoring methods at 40 CFR 98.344, which would require landfill 
owners and operators that elect to conduct these surface measurements 
to conduct the measurements using the methods in NSPS 40 CFR part 60, 
subpart XXX; provide a count of the number of locations with 
concentration above 500 parts per million above background identified 
during the surface measurement period; and to use the proposed equation 
term to adjust the reported methane emissions to account for these 
occurrences.
    We are requesting comment on the new set of proposed collection 
efficiencies for landfills with gas collection systems that do not 
conduct surface methane concentration measurements. Specifically, we 
request comment on our selection of 10 percent lower collection 
efficiencies for landfills that are not monitored for surface methane 
rather than selecting a 20 percent lower value as suggested by 
commenters that referenced the Maryland study data. We also request 
comment along with supporting data on whether the EPA should select an 
alternative collection efficiency value than the proposed 10 percent 
difference or the 20 percent difference we considered in response to 
comment.
    The EPA is also proposing to revise the reporting requirements for 
landfills with gas collection systems consistent with the proposed 
revisions in the methodology. We are proposing to separately require 
reporting for each gas collection systems and for each measurement 
location within a gas collection system. We are also proposing that, 
for each measurement location that measures gas to an on-site 
destruction device, certain information be reported about the 
destruction device, including: type of destruction device; the annual 
hours gas was sent to the destruction device; the annual operating 
hours where active gas flow was sent to the destruction device and the 
destruction device was operating at its intended temperature or other 
parameter indicative of effective operation; and the fraction of the 
recovered methane reported for the measurement location directed to the 
destruction device. Note, for sites that have a single measurement 
location that subsequently sends gas to multiple destruction devices, 
we realize the hours gas is sent to each device and the fraction of 
recovered methane sent to each device would have to be estimated based 
on best available data or engineering judgement. We are also proposing 
to require reporting of identifying information for each gas collection 
system, each measurement location within a gas collection system, and 
each destruction device.
    These reporting requirements are similar to those currently 
included in subpart HH but have been restructured to more clearly 
identify reporting elements associated with each gas collection system, 
each measurement location within a gas collection system, and each 
control device associated with a measurement location.
    We are also adding reporting requirements for landfills with gas 
collection systems to indicate the applicability of Federal rules or 
state and Federal implementation plans that require quarterly surface 
monitoring, an indication of whether surface methane concentration 
monitoring is conducted, the frequency of monitoring, and the 
information for each instance surface methane concentrations exceeded 
500 parts per million above background, including re-monitoring 
exceedances. These additional reporting elements are being proposed to 
better understand the applicability of the NSPS (40 CFR part 60, 
subpart WWW or XXX), state plans implementing the EG (40 CFR part 60, 
subparts Cc or Cf), and Federal plans (40 CFR part 62, subparts GGG or 
OOO), and to support verification of the reported emissions given the 
additional term added to equations HH-6, HH-7, and HH-8 and the 
different gas collection efficiency values.
    Currently, subpart HH estimates of methane emissions from landfills 
are based on modeling data and methane measurement data from landfill 
gas collection systems. In addition to our proposal of using methane 
surface emissions monitoring to better quantify subpart HH estimates, 
the EPA is seeking comment on how other methane monitoring 
technologies, e.g., satellite imaging, aerial measurements, vehicle-
mounted mobile measurement, or continuous sensor networks, might 
enhance subpart HH emissions estimates. Specifically, the EPA is 
seeking comment for examples of methane data collected from available 
monitoring methodologies and how such data might be incorporated into 
subpart HH for estimating annual emissions.
    Finally, we are clarifying a proposed revision included in the 2022 
Data Quality Improvements Proposal. As described in the preamble of 
that document, for Table HH-1, we proposed to revise the first order of 
decay rate (k) for bulk waste under both the ``Bulk waste option'' and 
the ``Modified bulk MSW option'' to 0.055 to 0.142 per year. However, 
we inadvertently included the current k value for bulk waste under the 
Modified bulk MSW option (0.02 to 0.057 per year) in the amendatory 
text of that document. Therefore, in today's proposal, we are 
correcting this oversight and proposing to revise the k value for bulk 
waste under the Modified bulk MSW option in Table HH-1 to be 0.055 to 
0.142 per year. For more information on the proposed k value for bulk 
waste under the Modified bulk MSW option, see the preamble to the 2022 
Data Quality Improvements Proposal and the memorandum, Multivariate 
analysis of data reported to the EPA's Greenhouse Gas Reporting Program 
(GHGRP), Subpart HH (Municipal Solid Waste Landfills) to optimize DOC 
and k values, available in the docket for this rulemaking (Docket Id. 
No. EPA-HQ-OAR-2019-0424).
    In addition to the proposed revisions, we are also providing 
notification of additional materials available for review related to 
proposed revisions to subpart HH included in the 2022 Data Quality 
Improvements Proposal (87 FR 37008; June 21, 2022). As discussed in the 
June 21, 2022 proposed rule, the EPA previously conducted a 
multivariate analysis based on 6 years of data from 355 landfills 
reporting under subpart HH, which we subsequently relied on to propose 
revised degradable organic carbon (DOC) and first order decay rate (k) 
values for the Bulk Waste and Modified Bulk Waste streams in Table HH-
1. We summarized the methodology and findings of the analysis in the 
memorandum from Meaghan McGrath, Kate Bronstein, and Jeff Coburn, RTI 
International, to Rachel Schmeltz, EPA, Multivariate analysis of data 
reported to

[[Page 32880]]

the EPA's Greenhouse Gas Reporting Program (GHGRP), Subpart HH 
(Municipal Solid Waste Landfills) to optimize DOC and k values, (June 
11, 2019), available in the docket for this rulemaking (Docket Id. No. 
EPA-HQ-OAR-2019-0424).
    Following the 2022 Data Quality Improvements Proposal, we received 
requests from waste industry stakeholders regarding the referenced 
memorandum and the availability of the cohort data supporting the 
analysis, the input files used in the analysis, and the summary of the 
analysis results that were used to support the proposed revised DOC and 
k values. These materials are referred to within the docketed 
memorandum but were inadvertently not included as attachments to the 
document in the proposed rule docket. On recognizing this oversight, we 
subsequently uploaded the materials as attachments to the original 
memorandum on August 11, 2022, found at www.regulations.gov/document/EPA-HQ-OAR-2019-0424-0170. In this supplemental proposal, we are 
providing further notification that these materials are available, and 
we are seeking additional comment on these materials during the comment 
period of this supplemental proposal. Note that some of the file types 
supporting the analysis, including files generated by RStudio (an open 
source statistical programming software), are not supported by 
www.regulations.gov/; however, interested parties may reference the 
directions at www.regulations.gov/document/EPA-HQ-OAR-2019-0424-0170 to 
contact the EPA Docket Center Public Reading Room to request to view or 
receive a copy of all documents.

K. Subpart OO--Suppliers of Industrial Greenhouse Gases

    For the reasons provided in section II.A of this preamble, the EPA 
is proposing revisions to subpart OO of part 98 (Suppliers of 
Industrial Greenhouse Gases) that would improve the quality of the data 
collected under the GHGRP and that would clarify certain provisions. To 
improve the quality of the data collected under the GHGRP, we are 
proposing to add requirements for bulk importers of F-GHGs to provide, 
as part of the information required for each import in the annual 
report, copies of the corresponding U.S. Customs and Border Protection 
(CBP) entry forms (e.g., CBP Form 7501), and that suppliers of F-HTFs 
identify the end uses for which F-HTFs are used and the quantity of 
each F-HTF transferred for each end use, if known. The EPA currently 
requires at 40 CFR 98.417(c) that bulk importers of fluorinated GHGs 
retain records substantiating each of the imports that they report, 
including: a copy of the bill of lading for the import, the invoice for 
the import, and the CBP entry form. Under the existing regulations, 
these records must be made available to the EPA upon request by the 
administrator (40 CFR 98.3(g)). In conducting verification reviews of 
the historically reported import data related to HFCs, the EPA 
discovered discrepancies between data reported to e-GGRT and those 
reported to CBP with an entry. The EPA contacted the corresponding 
suppliers to request substantiating documentation and found several 
erroneous subpart OO submissions for various suppliers and years, with 
some of these errors representing significant CO2e 
quantities. Furthermore, the data in e-GGRT and those entry data 
reported to CBP are not directly comparable (due to differences in 
scope, HTS codes that cover broad groups of chemicals, etc.), so while 
this comparison can lead to the discovery of some errors, such 
comparison does not result in robust verification. Additionally, 
subpart OO imports can vary greatly from year to year for an individual 
supplier, so the EPA's standard verification checks (e.g., looking at 
outliers or changes from year to year) are not as effective at 
identifying errors in subpart OO reports as they are for other GHGRP 
subparts. Therefore, requiring that suppliers submit substantiating 
records (i.e., the CBP forms) as a part of the annual report would 
improve verification and data quality for subpart OO. The EPA would be 
able to review the documentation to ensure that supplier-level and 
national-level fluorinated gas import data are accurate. The proposed 
changes would add a reporting requirement to 40 CFR 98.416(c). Because 
the entry form is already required to be retained as a record at 40 CFR 
98.417(c)(3) for each of the imports reported, it is not anticipated 
that this reporting requirement would cause a significant change in 
burden.
    However, because certain information related to HFC imports is now 
being tracked under 40 CFR part 84 (the AIM Act phasedown of 
hydrofluorocarbons), we are proposing that the documentation reporting 
requirement would not apply to imports of HFCs that are regulated 
substances under 40 CFR part 84. For example, if a supplier imported 
both SF6 and HFC-134a in a reporting year, the supplier 
would only submit the entry forms associated with the imports of 
SF6 in their annual GHG report submitted under 40 CFR part 
98. As HFC-134a is a regulated substance under 40 CFR part 84, the 
importer would already provide substantiating information to the EPA 
under that part. This would reduce potential duplicative burden on the 
suppliers that are subject to both 40 CFR part 98 and 40 CFR part 84. 
We seek comment on this possible exception for AIM HFC suppliers.
    Although we are proposing to collect copies of the CBP entry form 
for each import, we seek comment on whether other types of 
documentation associated with an import may be more useful, e.g., the 
bill of lading. We seek comment on the type of information available in 
these forms in practice, and which would best suit the verification 
goals of the GHGRP. We are also proposing a related confidentiality 
determination for the documentation reporting requirement, as discussed 
in section VI of this preamble.
    Additionally, we are proposing to require at 40 CFR 98.416(k) that 
suppliers of F-HTFs, including but not limited to perfluoroalkylamines, 
perfluoroalkylmorpholines, hydrofluoroethers, and perfluoropolyethers 
(including PFPMIE), identify the end uses for which the heat transfer 
fluid is used and the aggregated annual quantities of each F-HTF 
transferred to each end use, if known. This proposed requirement, which 
is patterned after a similar requirement under subpart PP of part 98 
(Suppliers of Carbon Dioxide), would help to inform the development of 
GHG policies and programs by providing information on F-HTF uses and 
their relative importance. This proposed requirement supplements our 
2022 Data Quality Improvements Proposal to require similar information 
for N2O, SF6, and PFCs. We are proposing the 
requirement for F-HTFs because: (1) the GWP-weighted quantities of 
these compounds that are supplied annually to the U.S. economy are 
relatively large; and (2) the identities and magnitudes of the uses of 
these compounds are less well understood than those of some other 
industrial GHGs, such as HFCs used in traditional air-conditioning and 
refrigeration applications. Fluorinated HTFs are known to be used in 
electronics manufacturing for temperature control (process cooling), 
thermal shock testing of devices, cleaning substrate surfaces and other 
parts, and soldering, but the total quantity of F-HTFs that are emitted 
from electronics manufacturing has fallen significantly below the total 
quantity of F-HTFs supplied annually to the U.S. economy from 2011 
through 2019. Discussions with F-HTF suppliers indicate that this 
shortfall is at least

[[Page 32881]]

partly attributable to substantial uses of F-HTFs outside of the 
electronics industry. To better understand the magnitudes and trends of 
these uses, we are proposing to collect information from suppliers of 
these compounds on how their customers use the compounds, and in what 
quantities. This issue is discussed further in the Technical Support 
Document on Use of Fluorinated HTFs Outside of Electronics 
Manufacturing included in the docket for this rulemaking (Docket Id. 
No. EPA-HQ-OAR-2019-0424). As discussed in section II.A.2 of this 
preamble, we are also proposing to revise the definition of 
``fluorinated HTF,'' currently included in subpart I of part 98 
(Electronics Manufacturing), and to move the definition to subpart A of 
part 98 (General Provisions) to harmonize with the proposed changes to 
subpart OO.
    To inform the revision of the subpart OO electronic reporting form 
in the event that this proposed amendment is finalized, we request 
comment on the end use applications for which F-HTFs are used and their 
relative importance. The EPA is aware of the following end uses of F-
HTFs:
    The following applications within electronics manufacturing:
     temperature control;
     device testing (thermal shock testing);
     cleaning substrate surfaces and other parts; and
     soldering.
    The following applications outside of electronics manufacturing:
     Temperature control within data center operations 
(including cryptocurrency mining);
     Immersion cooling;
     Direct-to-chip (i.e., plate) cooling;
     Temperature control for military purposes, including 
cooling of electronics in ground and airborne radar (klystrons); 
avionics; missile guidance systems; ECM (Electronic Counter Measures); 
sonar; amphibious assault vehicles; other surveillance aircraft; 
lasers; SDI (Strategic Defense Initiative; stealth aircraft; and 
electric motors;
     Temperature control in pharmaceutical manufacturing;
     Temperature control in medical applications;
     Solvent use outside the electronics manufacturing industry 
(e.g., use as a deposition solvent in filter and aerospace 
manufacturing, use to clean medical devices);
     Coatings for adhesives; and
     Thermal shock testing outside the electronics 
manufacturing industry.
    Finally, we are also proposing to clarify certain exceptions to the 
subpart OO reporting requirements for importers and exporters. 
Currently, the importer reporting requirement at 40 CFR 98.416(c) 
reads:
    ``Each bulk importer[/exporter] of fluorinated GHGs, fluorinated 
HTFs, or nitrous oxide shall submit an annual report that summarizes 
its imports[/exports] at the corporate level, except for shipments 
including less than twenty-five kilograms of fluorinated GHGs, 
fluorinated HTFs, or nitrous oxide, transshipments, and heels that meet 
the conditions set forth at Sec.  98.417(e).''
    The exporter reporting requirement at 40 CFR 98.416(d) is similar, 
except heels are not required to meet the conditions set forth at 40 
CFR 98.417(e).
    We are proposing to revise 40 CFR 98.416(c) and (d) to clarify that 
the exceptions are voluntary, consistent with our original intent. This 
proposed change would also minimize the burden of reporting HFC imports 
and exports under subpart OO after reporting HFC imports and exports 
under 40 CFR part 84 (the AIM Act phasedown of hydrofluorocarbons) for 
reporters who are subject to both programs. Under subpart A of part 84, 
there are no exceptions for reporting imports or exports of shipments 
of less than 25 kilograms, transshipments, or heels.
    To implement this change, we are proposing to insert ``importers 
may exclude'' between ``except'' and ``for shipments'' in the first 
sentence of paragraphs 98.416(c) and (d), deleting the ``for.'' We are 
also proposing to clarify that imports and exports of transshipments 
would both have to be either included or excluded for any given 
importer or exporter, and we are proposing a similar clarification for 
heels. The last two clarifications are intended to prevent the bias in 
the net supply estimate (the difference between imports and exports) 
that would occur if, for example, transshipments were counted as 
imports but not exports or vice versa.
    Because the exceptions under subpart OO were intended to reduce 
burden rather than to increase data quality, we do not anticipate that 
data quality would be negatively affected by clarifying that the 
exceptions are voluntary, as long as the exceptions are treated 
consistently by individual reporters as described in this section. (In 
fact, as discussed further in this section, including heels is expected 
to increase data quality.) The only potential concerns that we have 
identified are potential inconsistencies among importers or exporters 
or for the same importer or exporter over time. Inconsistency among 
importers or exporters could occur if some importers or exporters chose 
to include the excepted quantities in their reports while others did 
not.\39\ Inconsistency for individual importers or exporters over time 
could occur if some importers or exporters who have not previously 
reported the excepted quantities decided to begin reporting them. 
However, because the quantities affected by the exceptions are expected 
to be small, we anticipate that these inconsistencies would also be 
small.
---------------------------------------------------------------------------

    \39\ This presumes that the importers and exporters are not 
already reading the exceptions as voluntary.
---------------------------------------------------------------------------

    If these inconsistencies (or other data quality issues raised by 
commenters) did pose a concern, one way of minimizing such concerns 
while minimizing the burden of reporting HFC imports and exports under 
both subpart OO and part 84 would be to eliminate the exceptions as 
they apply to HFCs regulated under part 84, which would harmonize the 
data requirements of the two programs for importers and exporters. We 
request comment on this option.
    We are also requesting comment on the option of specifically 
eliminating the exception for heels from 40 CFR 98.416(c) and (d) for 
importers and exporters of all industrial gases and fluorinated HTFs. A 
heel is the quantity of gas that remains in a container after most of 
the gas has been extracted.\40\ Not reporting heels can result in bias 
in net supply estimates. This is because the exception for heels does 
not apply when the heel is part of the contents of a full container on 
its way to gas users (e.g., exported), but the exception does apply 
when the heel is the only gas in the container being returned to 
producers or distributors (e.g., imported). For example, in the typical 
scenario where a heel makes up about 10 percent of the contents of a 
full container, 100 percent of the gas would be reported as exported, 
but, if the exception for heels were used, none of the gas would be 
reported as imported when the container was returned, even though 10 
percent of the original contents would in fact be imported. This would 
result in an estimate that 100 percent of the gas was permanently 
exported when only 90 percent of the gas was actually permanently 
exported. Eliminating the exception for heels would eliminate this 
bias, improving the quality of the data collected under the GHGRP. 
However, this change could also increase burden for importers and 
exporters reporting

[[Page 32882]]

imports and exports of industrial gases and fluorinated HTFs other than 
HFCs.
---------------------------------------------------------------------------

    \40\ A heel is often left in the container because removing it 
would require special equipment (e.g., a pump).
---------------------------------------------------------------------------

L. Subpart PP--Suppliers of Carbon Dioxide

    For the reasons provided in section II.D of this preamble, the EPA 
is proposing revisions to subpart PP of part 98 (Suppliers of Carbon 
Dioxide) that would improve the quality of the data collection under 
the GHGRP. Specifically, the EPA is proposing to add and amend certain 
data reporting requirements in 40 CFR 98.426(f) and (h). The proposed 
changes would improve our understanding of supplied CO2 
through the economy. CO2 is captured across a range of 
different facilities including gas processing plants, ethanol plants, 
electric generating units (EGUs), and other manufacturing and 
processing facilities. In the future, CO2 capture deployment 
is expected to expand at these types of facilities and may also be 
captured at other types of facilities including at direct air capture 
facilities. The GHGRP tracks the supply and storage of CO2 
through the economy based on data reported to subparts PP (Suppliers of 
Carbon Dioxide), RR (Geologic Sequestration of Carbon Dioxide), UU 
(Injection of Carbon Dioxide), and proposed subpart VV (Geologic 
Sequestration of Carbon Dioxide With Enhanced Oil Recovery Using ISO 
27916) (see 87 FR 36920; June 21, 2022).
    Suppliers subject to subpart PP report data on CO2 
captured. These suppliers must report the aggregated annual quantity of 
CO2 in metric tons that is transferred to each of the end 
use applications listed at 40 CFR 98.426(f). This includes, but is not 
limited to, reporting the amount transferred for geologic sequestration 
that is covered by subpart RR (40 CFR 98.426(f)(11)). In the 2022 Data 
Quality Improvements Proposal, the EPA proposed to add subpart VV 
(Geologic Sequestration of Carbon Dioxide With Enhanced Oil Recovery 
Using ISO 27916). To ensure that we are adequately tracking the end use 
applications of supplied CO2, the EPA is proposing to add a 
data element to 40 CFR 98.426(f) that would require suppliers to report 
the annual quantity of CO2 in metric tons that is 
transferred for use in geologic sequestration with EOR subject to 
subpart VV. Without this change, suppliers would have otherwise been 
required to report this quantity under one of the other end use 
applications listed at 40 CFR 98.426(f). Therefore, the EPA anticipates 
that this new data element would result in a negligible increase in 
reporting burden.
    The EPA is considering further expanding the list of end-use 
applications reported at 40 CFR 98.426(f) to better account for and 
track emerging CO2 end uses. To that end, the EPA is seeking 
comment on CO2 end uses that would be appropriate to add to 
40 CFR 98.426(f). Possible additions could include algal systems, 
chemical production, and/or mineralization processes, such as the 
production of cements, aggregates, or bicarbonates. The EPA seeks 
comment on what other end uses may be appropriate to add to 40 CFR 
98.426(f) in future rulemakings.
    Under 40 CFR 98.426(h), facilities that capture a CO2 
stream from an EGU that is subject to subpart D of part 98 (Electricity 
Generation) and transfer CO2 to any facilities that are 
subject to subpart RR are currently required to report additional 
information including the GHGRP facility identification number 
associated with the subpart D facility, the GHGRP facility 
identification numbers for the subpart RR facilities to which the 
CO2 is transferred, and the annual quantities of 
CO2 transferred to each of those subpart RR facilities. The 
EPA believes that expanding the applicability of 40 CFR 98.426(h) to 
apply to sources beyond subpart D EGUs is essential to allow the EPA to 
fully track captured and sequestered CO2 in the economy. 
Additionally, the EPA believes that expanding the paragraphs to apply 
to facilities that transfer CO2 to facilities subject to 
subpart VV would be more comprehensive, given that proposed subpart VV 
would also apply to geologic sequestration.
    Therefore, the EPA is proposing to amend 40 CFR 98.426(h) to apply 
to any facilities that capture a CO2 stream from a facility 
subject to 40 CFR part 98 and supply that CO2 stream to 
facilities that are subject to either subpart RR or proposed subpart 
VV. In other words, the revised paragraph would no longer apply only to 
EGUs subject to subpart D, but to any direct emitting facility that is 
the source of CO2 captured and transferred to facilities 
subject to subparts RR or VV. The revised data elements would require 
that any facility that captures a CO2 stream and transfers 
CO2 to any facility subject to subpart RR or subpart VV to 
report the GHGRP facility identification number for the facility from 
which the CO2 is captured, the GHGRP facility identification 
numbers for the subpart RR and subpart VV facilities to which the 
CO2 is transferred, and the quantities of CO2 
supplied to each receiving facility. For 40 CFR 98.426(h)(1), which 
requires the facility identification number for the CO2 
source facility, the applicable facility identification number may be 
the same as the subpart PP facility or may be that of a separate direct 
emitting facility (e.g., a subpart D EGU facility, a subpart P hydrogen 
production facility), depending on the facility-specific 
characteristics. The EPA believes the reporting burden for these 
revisions will be negligible because facilities already have this 
information readily available.
    The EPA is considering further expanding the requirement at 40 CFR 
98.426(h) such that facilities subject to subpart PP would report 
transfers of CO2 to any facilities reporting under 40 CFR 
part 98, not just those subject to subparts RR and VV. This would 
include reporting the amount of CO2 transferred on an annual 
basis as well as the relevant GHGRP facility identification numbers. 
The EPA understands that this information would be readily available to 
facilities subject to subpart PP as these facilities are aware of their 
customer base. In addition, subpart PP facilities already report 
information on a variety of end uses under 40 CFR 98.426(f). The EPA is 
requesting comment on whether this information would be readily 
available as well as other relevant information the EPA should consider 
regarding this potential revision.

M. Subpart QQ--Importers and Exporters of Fluorinated Greenhouse Gases 
Contained in Pre-Charged Equipment and Closed-Cell Foams

    For the reasons provided in section II.D of this preamble, we are 
proposing revisions to subpart QQ of part 98 (Importers and Exporters 
of Fluorinated Greenhouse Gases Contained in Pre-Charged Equipment or 
Closed-Cell Foams) that would improve the quality of the data 
collection under the GHGRP. Specifically, we are proposing to add a 
requirement for importers of F-GHGs in equipment and foams to provide, 
as part of the information required for each import in the annual 
report, copies of the corresponding CBP entry forms (e.g., CBP form 
7501). The EPA currently requires at 40 CFR 98.437(a) that importers 
retain records substantiating each of the imports that they report, 
including: a copy of the bill of lading for the import, the invoice for 
the import, and the CBP entry form. Under the existing regulations, 
these records must be made available to the EPA upon request by the 
administrator (40 CFR 98.3(g)). As discussed in section III.K of this 
preamble, in conducting verification reviews of the historically 
reported subpart OO (Suppliers of Industrial Greenhouse Gases) import 
data for HFCs, the EPA discovered discrepancies between data reported 
to e-GGRT and those entry data reported to CBP. The EPA contacted the

[[Page 32883]]

corresponding suppliers to request substantiating documentation and 
found several erroneous subpart OO submissions for various suppliers 
and years, with some of these errors representing significant 
CO2e quantities. The EPA has so far been unable to do a 
similarly useful comparison for subpart QQ data, primarily because the 
data in e-GGRT and those in CBP are not directly comparable (due to 
differences in scope, differences in HTS code coverage, etc.). 
Therefore, the EPA has thus far been unable to screen for errors in 
subpart QQ data using external data sets. Additionally, subpart QQ 
imports can vary greatly from year to year for an individual supplier, 
so the EPA's standard verification checks (e.g., looking at outliers or 
changes from year to year) are not as effective at identifying errors 
in subpart QQ reports as they are for other GHGRP Subparts. Therefore, 
requiring that suppliers submit substantiating records (i.e., the CBP 
entry forms) as a part of the annual report would improve verification 
and data quality for subpart QQ. The EPA would be able to review the 
documentation to ensure that supplier-level and national-level 
fluorinated gas import data are accurate. The proposed changes would 
add a reporting requirement to 40 CFR 98.436(a). Because the entry form 
is already required to be retained as a record at 40 CFR 98.437(a)(3) 
for each import reported, it is not anticipated that this reporting 
requirement would cause a significant change in burden.
    While we are proposing to collect copies of the CBP entry form for 
each import, we seek comment on whether other types of documentation 
associated with an import may be more useful, e.g., the bill of lading. 
We seek comment on the type of information available in these forms in 
practice, and which would best suit the verification goals of the 
GHGRP. We are also proposing a related confidentiality determination 
for the documentation reporting requirement, as discussed in section VI 
of this preamble.
    Additionally, we are proposing to add a requirement for importers 
or exporters of fluorinated GHGs contained in pre-charged equipment or 
closed-cell foams to include, as part of the information required for 
each import and export in the annual report, the Harmonized Tariff 
System (HTS) code (for importers) and the Schedule B codes (for 
exporters) used for shipping each equipment type.\41\ These would be 
new data reporting requirements under 40 CFR 98.436(a) and 40 CFR 
98.436(b). The HTS assigns 10-digit codes to identify products that are 
unique to U.S. markets. HTS codes start with a 6-digit code specifying 
a chapter, heading, and subheading, and in full include a specific 10-
digit code including a subheading for duty and a statistical suffix. 
Commodity codes are currently collected as a data element under subpart 
OO, with most suppliers reporting the applicable HTS code. In the 2022 
Data Quality Improvements Proposal, we proposed to revise the reporting 
of ``commodity code'' under subpart OO to clarify that reporters should 
submit the HTS code for each F-GHG, F-HTF, or N2O shipment 
(87 FR 37012). In this supplemental proposal, we are proposing to 
require the reporting of HTS codes from importers under subpart QQ to 
be consistent with the proposed revisions to subpart OO. Reporters 
would enter the full 10-digit HTS code with decimals, to extend to the 
statistical suffix, as it was entered on related customs forms. We are 
proposing to require reporting of Schedule B codes for exporters. 
Schedule B codes determine the export classification and are required 
when filling out trade documents to export goods out of the United 
States. Suppliers subject to subpart QQ are already required to 
maintain records substantiating their imports and exports, such as 
bills of lading, invoices, and CBP entry forms. It is the understanding 
of the EPA that these documents would contain the HTS codes or Schedule 
B codes associated with the shipments. We are proposing to gather this 
data, which is likely already available in supplier records, to verify 
and compare the data submitted to the GHGRP with other available import 
and export data. The proposed HTS and Schedule B codes would provide a 
means to cross-reference the data submitted and would help to ensure 
the accuracy and completeness of the information reported under the 
GHGRP. However, we are seeking comment on whether it is reasonable to 
require reporting of the HTS code for both importers and exporters, and 
on how the use of HTS codes differs for imports and exports. We are 
also seeking comment on whether shippers typically use a standard set 
of Schedule B codes or HTS codes for exports or if the codes may change 
based on the recipient country.
---------------------------------------------------------------------------

    \41\ A complete listing of HTS codes is available at https://hts.usitc.gov/current. A complete listing of Schedule B codes is 
available at: https://www.census.gov/foreign-trade/schedules/b/index.html.
---------------------------------------------------------------------------

    We are also proposing related confidentiality determinations for 
the proposed new and revised data elements, as discussed in section VI 
of this preamble.

N. Subpart RR--Geologic Sequestration of Carbon Dioxide

    The Geologic Sequestration of Carbon Dioxide source category 
(subpart RR of part 98) provides an accounting framework for facilities 
to report amounts of CO2 sequestered annually. Facilities 
develop an EPA-approved monitoring, reporting, and verification (MRV) 
plan, report on monitoring activities and use a mass balance approach 
to calculate amounts of carbon dioxide sequestered. Information 
collected under the GHGRP provides a transparent means for the EPA and 
the public to continue to evaluate the effectiveness of geologic 
sequestration.
    The EPA has received questions from stakeholders regarding the 
applicability of subpart RR to offshore geologic sequestration 
activities, including on the outer continental shelf. When the EPA 
finalized subpart RR (75 FR 75060, December 1, 2010), we noted that the 
source category covered not only onshore injection of CO2, 
but also offshore injection. For example, 40 CFR 98.446 specifies well 
identification information to be reported for wells with Underground 
Injection Control (UIC) permits and for offshore wells not subject to 
the Safe Drinking Water Act. The EPA also explained in its response to 
comments on the 2010 rule promulgating subpart RR that the source 
category covered offshore injection.\42\
---------------------------------------------------------------------------

    \42\ Mandatory Greenhouse Gas Reporting Rule: EPA's Response to 
Public Comments, Geologic Sequestration and Injection of Carbon 
Dioxide: Subparts RR and UU, Docket Id. No. EPA-HQ-OAR-2009-0926-
0834 (Response 2.1-a and Response 6.2-g), available at www.epa.gov/sites/default/files/2015-07/documents/subpart-rr-uu_rtc.pdf.
---------------------------------------------------------------------------

    While subpart RR covers offshore activities, we observe that 
subpart RR does not provide a definition for the term ``offshore'' and 
that providing a definition for such term would be helpful. Therefore, 
the EPA is proposing to add a definition for ``offshore'' to 40 CFR 
98.449. We propose that ``offshore'' means ``seaward of the terrestrial 
borders of the United States, including waters subject to the ebb and 
flow of the tide, as well as adjacent bays, lakes or other normally 
standing waters, and extending to the outer boundaries of the 
jurisdiction and control of the United States under the Outer 
Continental Shelf Lands Act.'' This is the same definition of offshore 
that is currently provided at 40 CFR 98.238 for subpart W of part 98 
(Petroleum and Natural Gas Systems).

[[Page 32884]]

O. Subpart UU--Injection of Carbon Dioxide

    In the 2022 Data Quality Improvements Proposal, the EPA proposed to 
amend subpart UU of part 98 (Injection of Carbon Dioxide). 
Specifically, the EPA proposed to amend 40 CFR 98.470 by redesignating 
paragraph (c) as paragraph (d) and adding new paragraph (c) to read, 
``(c) If you report under subpart VV of this part for a well or group 
of wells, you are not required to report under this subpart for that 
well or group of wells.'' Some commenters were concerned that, as 
written, the regulatory text under proposed subpart VV (Geologic 
Sequestration of Carbon Dioxide With Enhanced Oil Recovery Using ISO 
27816) and subpart UU could allow for CO2 to be reported 
under multiple subparts, resulting in double counting. Thus, we are 
proposing to revise the text in proposed paragraph 98.470(c) from ``are 
not required to report'' to ``shall not report.'' We are also proposing 
an additional sentence in paragraph 98.470(c) to clarify that 
CO2-EOR projects that become subject to subpart VV during a 
reporting year must report under subpart UU for the portion of the 
reporting year before they began using CSA/ANSI ISO 27916:2019 and 
under subpart VV for the portion after they began using CSA/ANSI ISO 
27916:2019. Facilities shall not report CO2 under subparts 
VV and UU in a way that is duplicative, but it is possible that 
facilities would report under both subparts during the reporting year 
in which they transition to using CSA/ANSI ISO 27916:2019. 
Additionally, we are similarly proposing to revise the text in 
paragraph 98.470(b) from ``are not required to report'' to ``shall not 
report,'' to clarify that facilities should not report under both 
subparts UU and RR. This also ensures consistency between paragraphs 
(b) and (c).

P. Subpart VV--Geologic Sequestration of Carbon Dioxide With Enhanced 
Oil Recovery Using ISO 27916

    In the 2022 Data Quality Improvements Proposal, the EPA proposed 
adding a new source category, subpart VV (Geologic Sequestration of 
Carbon Dioxide With Enhanced Oil Recovery Using ISO 27916), to part 98 
(see 87 FR 36920; June 21, 2022). The proposed new source category 
would add calculation and reporting requirements for quantifying 
geologic sequestration of CO2 in association with EOR 
operations. The proposed requirements would apply only to facilities 
that quantify the geologic sequestration of CO2 in 
association with EOR operations in conformance with the ISO standard 
designated as CSA/ANSI ISO 27916:2019, Carbon Dioxide Capture, 
Transportation and Geological Storage--Carbon Dioxide Storage Using 
Enhanced Oil Recovery. Under existing GHGRP requirements, facilities 
that receive CO2 for injection at EOR operations report 
under subpart UU (Injection of Carbon Dioxide); however, facilities 
that geologically sequester CO2 through EOR operations may 
instead opt-in to subpart RR (Geologic Sequestration of Carbon 
Dioxide).
    The EPA proposed regulatory text to define the subpart VV source 
category and establish applicability. Specifically, proposed 40 CFR 
98.480 stated that the source category pertains to CO2 that 
is injected in enhanced recovery operations for oil and other 
hydrocarbons (CO2-EOR) in which all of the following apply: 
(1) the CO2-EOR project uses the ISO standard designated as 
CSA/ANSI ISO 27916:2019 (proposed to be incorporated by reference, see 
40 CFR 98.7) as a method of quantifying geologic sequestration of 
CO2 in association with EOR operations; (2) the 
CO2-EOR project is not reporting under subpart UU of part 
98; and (3) the facility is not reporting under subpart RR of part 98. 
In the preamble to the proposal (87 FR 37016), the EPA wrote, ``. . . 
the EPA is proposing a new source category--subpart VV--related to the 
option for reporting of incidental CO2 storage associated 
with EOR based on the CSA/ANSI ISO 27916:2019 standard. Specifically, 
facilities that conduct EOR would be required to report basic 
information on CO2 received under subpart UU, or they could 
choose to opt-in to either subpart RR or the new subpart (VV) to 
quantify amounts of CO2 that are geologically sequestered.''
    The public comment period for the proposed rule closed on October 
6, 2022. With respect to subpart VV, the EPA received detailed comments 
on proposed 40 CFR 98.480 ``Definition of the Source Category.'' In 
particular, commenters were uncertain whether the EPA intended to 
require facilities using CSA/ANSI ISO 27916:2019 to report under 
subpart VV or whether facilities that used CSA/ANSI ISO 27916:2019 
would have the option to choose under which subpart they would report 
to: subpart RR, subpart UU, or subpart VV.
    After review of the comments, the EPA recognizes that the proposed 
subpart VV definition of the source category and the corresponding 
preamble text in the 2022 Data Quality Improvements Proposal were 
unclear. Therefore, we are re-proposing 40 CFR 98.480 in this proposed 
rule to clarify applicability of the rule and to seek comment on the 
re-proposed definition of the source category in subpart VV. Under this 
proposal, the EPA would not require that facilities quantify geologic 
sequestration of CO2 in association with EOR operations 
through the use of the CSA/ANSI ISO 27916:2019 method; however, if the 
facility elects to use the CSA/ANSI ISO 27916:2019 method for 
quantifying geologic sequestration of CO2 in association 
with EOR operations, then the facility would be required under the 
GHGRP to report under subpart VV (rather than reporting under subpart 
UU or opting into subpart RR). More specifically, the proposed rule 
would require facilities quantifying the mass of CO2 
geologically sequestered using CSA/ANSI ISO 27916:2019 to report the 
quantity of CO2 sequestered under subpart VV and to meet all 
requirements of subpart VV. It is our intention that subpart VV would 
apply to facilities that use CSA/ANSI ISO 27916:2019 for the purpose of 
demonstrating secure geologic storage; in other words, facilities that 
use CSA/ANSI ISO 27916:2019 for that purpose would be subject to 
subpart VV. Subpart VV is not intended to apply to facilities that use 
the content of CSA/ANSI ISO 27916:2019 for a purpose other than 
demonstrating secure geologic storage, such as only as a reference 
material or for informational purposes. EOR facilities that inject a 
CO2 stream into the subsurface that do not use CSA/ANSI ISO 
27916:2019 and have not opted into subpart RR would continue to be 
required to report the quantities of CO2 received for 
injection under subpart UU (Injection of Carbon Dioxide).
    Additionally, to remove ambiguity and further clarify our intent in 
defining the subpart VV source category, the EPA in this proposed rule 
is removing a paragraph from proposed subpart VV (proposed as 40 CFR 
98.480(a)(2) in the 2022 Data Quality Improvements Proposal). The 
proposed text in the 2022 Data Quality Improvements Proposal stated 
that the subpart VV source category applied to facilities not reporting 
under subpart UU. The EPA received comments that this language resulted 
in confusion over subpart VV applicability. We believe that removal of 
this text from the previously proposed ``Definition of the Source 
Category'' in 40 CFR 98.480 in this proposal provides additional 
clarity with respect to the EPA's intent concerning subpart VV 
applicability. Relatedly, to clarify our intent with regard to 
facilities that transition from reporting under subpart UU to reporting 
under subpart VV, the EPA in this proposed rule is proposing

[[Page 32885]]

to add paragraph 40 CFR 98.481(c). The proposed text clarifies that 
CO2-EOR projects previously reporting under subpart UU that 
begin using CSA/ANSI ISO 27916:2019 part-way through a reporting year 
must report under subpart UU for the portion of the year before CSA/
ANSI ISO 27916:2019 was used and report under subpart VV for the 
portion of the year once CSA/ANSI ISO 27916:2019 began to be used and 
thereafter. After the initial transition year, these facilities would 
be required to report under subpart VV only, until the requirements to 
discontinue reporting are met.
    The EPA notes that we are seeking comment on proposed subpart VV 
during the comment period for this supplemental proposal on only 
reproposed 40 CFR 98.480 and the newly proposed 40 CFR 98.481(c). 
Commenters do not need to resubmit comments previously submitted on 
proposed 40 CFR 98.481 through 98.489. The EPA is not reproposing or 
soliciting further comment on revised regulatory text or 
confidentiality determinations for the remaining sections of subpart VV 
that were originally proposed in the 2022 Data Quality Improvements 
Proposal (40 CFR 98.481 through 98.489). We are continuing to review 
and consider comments received on the 2022 Data Quality Improvements 
Proposal on those sections.

IV. Proposed Amendments To Add New Source Categories to Part 98

    This section summarizes the specific amendments the EPA is 
proposing to add new subparts, as generally described in section II.B 
of this preamble. The impacts of the proposed revisions are summarized 
in section VII of this preamble. A full discussion of the cost impacts 
for the proposed revisions may be found in the memorandum, Assessment 
of Burden Impacts for Proposed Revisions for the Greenhouse Gas 
Reporting Rule, available in the docket for this rulemaking (Docket Id. 
No. EPA-HQ-OAR-2019-0424).

A. Subpart B--Energy Consumption

1. Rationale for Inclusion in the GHGRP
    For the reasons described in section II.B and the 2022 Data Quality 
Improvements Proposal, consistent with its authority under the CAA, the 
EPA is proposing to add a new subpart--subpart B (Energy Consumption)--
to improve the completeness of the data collected under the GHGRP, add 
to the EPA's understanding of GHG data, and to better inform future EPA 
policy under the CAA, such as informing potential future EPA actions 
with respect to GHGs. Once collected, such data would also be available 
to improve on the estimates provided in the Inventory, by providing 
more information on the allocation of electricity use to different end 
use sectors.
    The GHGRP currently generally requires sources subject to part 98 
to report direct emissions and supply of GHGs from large industrial 
sources across 41 source categories. For sources of direct emissions 
subject to part 98, the GHGRP currently includes requirements to 
monitor, calculate, and report the direct emissions of GHGs that occur 
onsite from sources which meet the part 98 applicability requirements. 
However, these direct GHG emissions do not enable a comprehensive 
assessment of the quantity of energy required to operate the facility 
because industrial operations can consume a significant amount of 
energy for which direct GHG emissions do not occur at the production 
site, primarily through purchased electricity and thermal energy 
products.\43\ The purchased energy consumed is produced offsite, and 
the offsite energy production can result in significant GHG emissions. 
Because the facility's production processes are reliant on its energy 
consumption, the emissions associated with producing this energy are 
associated with the facility, and are often referred to as indirect 
emissions or Scope 2 emissions.\44\ Energy consumption can be a 
significant portion of the total energy input to making products, and 
therefore, a significant component of a facility's overall GHG 
footprint (i.e., a total accounting of both the direct emissions that 
occur onsite as well as indirect emissions that occur offsite in the 
production of the purchased energy that the facility consumes).
---------------------------------------------------------------------------

    \43\ In this preamble, we refer to purchased electricity and 
thermal energy products such as steam, heat (in the form of hot 
water), and cooling (in the form of chilled water) broadly as 
``purchased energy'' or ``purchased energy products.'' These terms 
exclude purchased fuels associated with direct emissions at the 
facility.
    \44\ See, e.g., the EPA's Scope 1 and Scope 2 Inventory 
Guidance, available at: www.epa.gov/climateleadership/scope-1-and-scope-2-inventory-guidance.
---------------------------------------------------------------------------

    The EPA is interested in collecting data on energy consumption to 
gain an improved understanding of the energy intensity (i.e., the 
amount of energy required to produce a given level of product or 
activity, both through onsite energy produced from fuel combustion and 
purchased energy) of specific facilities or sectors, and to better 
inform our understanding of energy needs and the potential indirect GHG 
emissions associated with certain sectors. Understanding the energy 
intensity of facilities and sectors is critical for evaluating and 
identifying the most effective energy efficiency and GHG reduction 
programs for different industrial sectors, particularly for sectors 
where purchased energy accounts for a significant portion of a typical 
facility's onsite energy use. For example, based on the most recent 
Manufacturing and Energy Consumption Survey (MECS) published by the DOE 
Energy Information Administration (EIA) in 2018,\45\ the EPA estimates 
that indirect GHG emissions from electricity consumption from the 
chemical manufacturing sector (4.8 million mtCO2e) were 
approximately equal to the chemical manufacturing sector's direct 
emissions from natural gas combustion (5.2 million mtCO2e). 
Similarly, these MECS data indicate that each of the following 
manufacturing sectors had indirect GHG emissions from electricity 
consumption approximately equal to or greater than the sector's direct 
GHG emissions from natural gas combustion: food, beverage, and tobacco 
products; textile mills; wood products; primary metals; fabricated 
metal products; transportation equipment; furniture and related 
products; chemicals; nonmetallic mineral products; and primary metals. 
For RY2020, more than 1,800 facilities from these manufacturing sectors 
reported direct GHG emissions to the GHGRP to a total of 26 subparts.
---------------------------------------------------------------------------

    \45\ See U.S. Energy Information Administration 2018 
Manufacturing and Energy Consumption Survey, www.eia.gov/consumption/manufacturing/pdf/MECS%202018%20Results%20Flipbook.pdf.
---------------------------------------------------------------------------

    Understanding the energy intensity of the facilities and sectors 
reporting under the GHGRP would also allow the EPA to identify 
industry-specific best operating practices for increasing energy 
efficiency and reducing GHG emissions, and to evaluate options for 
expanding the use of these best practices or other potential policy 
options. For example, while U.S. Energy Information Administration data 
show that industrial U.S. electric power usage declined from 1,372 
megawatt-hour (MWh) per customer in 2007 to 1,188 MWh per customer in 
2019,\46\ the EPA is unable to determine how individual industrial 
sectors contributed to the decreased electric power usage and is

[[Page 32886]]

therefore unable to identify best practices in use. With respect to 
thermal energy products, one best practice involves an industrial 
facility contracting with an adjacent, separately owned facility for 
steam delivery services. Often the steam suppliers deploy relatively 
more efficient combined heat and power (CHP) technologies, compared to 
the industrial source generating its own steam.\47\ Obtaining data on 
thermal energy product purchases would allow the EPA to better 
understand the use of this technology in different sectors and evaluate 
potential related policy options.
---------------------------------------------------------------------------

    \46\ Please see the Technical Support Document for Non-Fuel 
Energy Purchases: Supplemental Proposed Rule for Adding Energy 
Consumption Source Category under 40 CFR part 98, available in the 
docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424) for 
additional information on U.S. electric power sector usage.
    \47\ CHP systems achieve fuel use efficiencies of 65 to 80 
percent, compared to separate heat and power systems (i.e., 
purchased grid electricity from the utility and an on-site boiler), 
which have efficiencies of approximately 50 percent. Due to the 
higher efficiencies of CHP systems, they reduce the amount of fuel 
burned and reduce GHG emissions. See www.epa.gov/chp/chp-benefits 
for additional information.
---------------------------------------------------------------------------

    In this proposal, the EPA is reasserting that collecting 
information on purchased energy products is consistent with the EPA's 
existing CAA authority. As summarized in the 2009 Proposed Rule, CAA 
section 114(a)(1) authorizes the EPA to, inter alia, require certain 
persons on a one-time, periodic, or continuous basis to keep records, 
make reports, undertake monitoring, sample emissions, or provide such 
other information as the EPA may reasonably require. The EPA may 
require the submission of this information from any person who (1) owns 
or operates an emission source, (2) manufactures control or process 
equipment, (3) the EPA believes may have information necessary for the 
purposes set forth in this section, or (4) is subject to any 
requirement of the Act (except for manufacturers subject to certain 
title II requirements, who are subject to CAA section 208). The EPA may 
require this information for the purposes of developing or assisting in 
the development of any implementation plan, an emission standard under 
sections 111, 112 or 129, determining if any person is in violation of 
any such standard or any requirement of an implementation plan, or 
``carrying out any provision'' \48\ of the Act.
---------------------------------------------------------------------------

    \48\ Except a provision of Title II of the CAA with respect to a 
manufacturer of new motor vehicles or new motor vehicle engines, as 
those provisions are covered under CAA section 208.
---------------------------------------------------------------------------

    As the EPA noted in the 2022 Data Quality Improvements Proposal, in 
the development of the GHGRP in the 2009 rule,\49\ the Agency 
considered its authorities under CAA sections 114 and 208 and the 
information that would be relevant to the EPA's ``carrying out'' a wide 
variety of CAA provisions when identifying source categories for 
reporting requirements. The scope of the persons potentially subject to 
a CAA section 114(a)(1) information request (e.g., a person ``who the 
Administrator believes may have information necessary for the purposes 
set forth in'' CAA section 114(a)) and the reach of the phrase 
``carrying out any provision'' of the Act are quite broad. Given the 
broad scope of CAA section 114, it is appropriate for the EPA to 
collect information on purchased energy because such information is 
relevant to the EPA's ability to carry out a wide variety of CAA 
provisions. As the EPA explained in initially promulgating the GHGRP, 
it is entirely appropriate for the Agency under CAA section 114 to 
gather such information to allow a comprehensive assessment of how to 
best address GHG emissions and climate change under the CAA, including 
both regulatory \50\ and non-regulatory \51\ options. A firm 
understanding of both upstream and downstream sources provides a 
sounder foundation for effective research and development for potential 
actions under the CAA. The better the EPA's understanding of 
differences within and between source categories, the better the 
Agency's ability to identify and prioritize research and development as 
well as program needs under the CAA.
---------------------------------------------------------------------------

    \49\ We also note that as part of the process in selecting the 
original list of source categories to include in the GHG Reporting 
Rule in 2009, the EPA also considered the language of the 
Appropriations Act, which referred to reporting ``in all sectors of 
the economy,'' and the accompanying explanatory statement, which 
directed the EPA to include ``emissions from upstream production and 
downstream sources to the extent the Administrator deems it 
appropriate'' (74 FR 16465, April 10, 2009).
    \50\ See, e.g., under CAA sections 111(b) and (d).
    \51\ See, e.g., under CAA section 103(g). As explained further 
in the record for the 2009 Final Rule (74 FR 16448), it is entirely 
appropriate for the EPA to propose to gather information for 
purposes of carrying out CAA section 103 in this supplemental 
proposed rule.
---------------------------------------------------------------------------

2. Public Comments Received in Request for Comment
    In the 2009 Proposed Rule (74 FR 16479, April 10, 2009), the EPA 
sought comment on, but did not propose, requiring reporting related to 
purchased energy products. The EPA explained in the 2009 Final Rule 
that, while it was not then deciding to require facilities to report 
their electricity purchases or indirect emissions from electricity 
consumption, we believed that acquiring such data may be important in 
the future and intended to explore options for possible future data 
collection on electricity purchases and indirect emissions, and the 
uses of such data. Comments received on the 2009 Proposed Rule, as well 
as the Agency's responses to those comments, are summarized in the 2009 
Final rule (74 FR 56288-56289, October 30, 2009) and the 2009 response 
to public comments.\52\
---------------------------------------------------------------------------

    \52\ Mandatory Greenhouse Gas Reporting Rule: EPA's Response to 
Public Comments, Volume No.: 1, Selection of Source Categories to 
Report and Level of Reporting. Available at Docket Id. No. EPA-HQ-
OAR-2008-0508-2258.
---------------------------------------------------------------------------

    In section IV.F of the 2022 Data Quality Improvements Proposal, the 
EPA requested further comment on the potential addition of the energy 
consumption source category, including the following topics:
     Whether the EPA should add a source category for energy 
consumption;
     Information to characterize purchased energy markets 
(i.e., regulated or de-regulated) and products (e.g., renewable 
attributes of purchased products);
     Whether the EPA should limit reporting requirements to 
purchased energy or require facilities to convert their energy 
consumption to indirect emission estimates;
     Information on whether or not associated reporting 
requirements should include purchased thermal energy products and if 
the requirements should differentiate purchased thermal energy products 
from purchased electricity;
     Whether the EPA should limit the applicability to sources 
that are already subject to the GHGRP or consider specific industrial 
sectors or technologies that may not be completely represented within 
the GHGRP but that should be considered when evaluating the energy use 
performance of industrial sources;
     What measures would minimize the burden of reporting 
parameters related to purchased energy transactions;
     What monitoring and recordkeeping systems are currently in 
place for purchased energy transactions and what methodologies are 
recommended for monitoring and QA/QC; and
     What existing industry standards are available for 
assessing the accuracy of the monitoring systems used for purchased 
energy transactions.
    This section presents a broad overview of the comments received on 
the request for comment in the 2022 Data Quality Improvements Proposal 
as well as relevant comments from the 2009 Proposed Rule's request for 
comment.
    We note that in response to the 2009 Proposed Rule and the 2022 
Data Quality Improvements Proposal requests

[[Page 32887]]

for comment, some commenters stated that collecting information on 
electricity purchases was either outside the scope of the GHGRP or 
outside the scope of the EPA's CAA section 114 authority. However, 
other commenters stated that collecting purchased electricity 
information was within the scope of the GHGRP and the EPA's CAA section 
114 authority. Certain commenters stated that such information could 
inform the EPA's analysis of the feasibility, cost, and efficacy of 
reducing emissions through electrification in various subsectors, as 
well as the impacts of the incidental electrification that results when 
sources comply with regulatory requirements premised on other control 
techniques.
    The EPA disagrees that we should or must interpret the language of 
CAA section 114 as narrowly as some commenters advocate. While Congress 
highlighted certain potential uses of the information gathered under 
CAA section 114 in a portion of CAA section 114(a), Congress also 
explicitly listed in CAA section 114(a) the potential use of ``carrying 
out any provision'' of the Act. The EPA has a variety of duties in the 
CAA that extend to both regulatory and non-regulatory programs, and 
limiting the scope of CAA section 114 as some commenters urge would 
hinder the EPA's ability to implement those provisions and subvert 
Congressional intent. The EPA also notes that the point of gathering 
information under CAA section 114 is to inform decisions regarding the 
legal, technical, and policy viability of various options for carrying 
out provisions under the CAA. To require a narrowing of those options 
beforehand would curtail the EPA's decision making before the 
information is available for consideration. Collection of energy 
consumption information as the EPA is proposing in this action would 
allow the Agency to undertake a more thorough and holistic evaluation 
of how to utilize its authority under the CAA, both regulatory and non-
regulatory, to address GHG emissions and climate change, consistent 
with its authority under CAA section 114.
    We received several comments from stakeholders regarding how the 
EPA should define the energy consumption source category. Commenters 
discussed issues such as: (i) reporting at the facility-level versus 
the corporate-level; (ii) applying requirements to sources currently 
subject to part 98 versus sources that are not currently subject to 
part 98, including both purchased electricity and thermal energy 
products; and (iii) excluding purchased electricity consumed by power 
plants.
    With respect to the facility-level versus corporate-level reporting 
issue, some commenters supporting the addition of the energy 
consumption source category stated that already established voluntary 
programs for reporting energy consumption are based on corporate-level 
protocols rather than the facility-level approach that is being 
proposed under the GHGRP. Other commenters opposing reporting of 
purchased energy said that electricity purchases are made at the 
corporate-level for some facilities. Commenters supporting the addition 
of energy consumption stated that the definition of the source category 
should apply to both current GHGRP reporters and non-reporters with 
energy consumption levels comparable to current reporters; these 
commenters suggested that energy consumption reporting requirements 
should be codified under subpart A of part 98 (General Provisions). 
Certain commenters also said that the definition should include both 
purchased electricity and thermal energy products, with separate 
reporting requirements for each.
    As discussed in section IV.A.3 of this preamble, the EPA is 
proposing to define the energy consumption category to include direct-
emitting facilities that (1) purchase metered electricity or metered 
thermal energy products, and (2) are currently required to report under 
part 98. At this time, the EPA is proposing to limit the source 
category to include metered, purchased energy products that are 
consumed at the facility in order to reduce burden for reporters, by 
allowing reporters to rely on existing purchase contracts for which 
metering and billing requirements are already in place. In determining 
which requirements to propose, the EPA has considered both the 
reporting burden that would result and the need to collect that 
information to inform policy under the CAA at this time. While we are 
proposing to require reporting at the facility-level for direct 
emitters, the proposed requirements do not require calculation or 
reporting of indirect GHG emissions. The proposed requirements are 
limited at this time to development of a metered energy monitoring plan 
and recordkeeping and reporting activities that direct-emitting 
facilities that currently report under part 98 may complete using 
information that we anticipate is readily available to them, 
predominantly in their energy bills. We are proposing to include 
reporting for both purchased electricity and purchased thermal energy 
products, because both forms of energy are needed to evaluate the 
efficiency of GHG emitting activities within discrete sectors.
    The EPA also received comments stating that indirect emissions 
estimates derived from energy consumption would not be useful, would be 
inherently inaccurate, and would lead to double counting of direct 
emissions. Specifically, certain commenters said that the EPA should 
continue to focus only on direct GHG emissions and expressed concerns 
that any future indirect emissions estimates (derived from energy 
consumption data) could be added together with direct emissions 
estimates for the power sector leading to overall double counting of 
air emissions in multisector inventories. Other commenters stated that 
indirect emissions estimates derived from energy consumption data are 
inherently inaccurate and not useful because the origin of consumed 
energy cannot be easily determined for all consumers.
    The EPA is not proposing in this action to require reporters to 
develop indirect emissions estimates. The EPA disagrees with the 
commenters to the extent they assert or suggest that the reporting of 
energy consumption has no value, that it constitutes double counting, 
and that the Agency should not collect purchased energy data because of 
accounting concerns related to indirect emissions estimates. For 
industrial sectors that rely on fossil fuel energy conversion 
activities like boilers, turbines, and engines, part 98 currently 
provides energy efficiency analysts with sector-specific information on 
the fuels used and associated direct emissions. These data can be 
converted to the same basis as purchased energy data (i.e., kilowatt-
hours consumed) with standard engineering calculations. However, the 
EPA has determined that it is difficult to compare energy efficiencies 
of different facilities within the same industrial sector when looking 
only at facility-located fossil fuel energy conversion operations. 
Accordingly, in developing this proposal the EPA has determined that 
sector-specific energy consumption data are not only useful but are 
also essential for identifying the most energy efficient facilities 
within each sector. Additionally, the EPA disagrees with those 
commenters asserting that energy consumption data should not be 
collected based on the commenters' asserted potential accuracy and 
accounting concerns related to indirect emissions. As noted previously, 
it is not necessary to convert purchased energy data into indirect 
emissions estimates to compare the energy efficiency of different 
facilities within the same sector, as intended by the EPA in this 
action. For example, the EPA

[[Page 32888]]

could complete facility-specific analyses for the iron and steel sector 
(or for discrete iron and steel subsectors) by combining the reported 
fuel-specific direct emissions values and emissions factors to estimate 
the fuel use quantity, which could subsequently be converted to annual 
kilowatt-hours-thermal (kWhth) values using fuel-specific heating 
values. With the addition of purchased energy data under part 98, each 
facility's thermal fossil energy consumption could be added to each 
facility's purchased energy consumption to compare all facilities 
within the iron and steel sector on the same total energy consumption 
basis.
    Finally, the commenters' concerns that analysts may use the energy 
consumption data in multisector analyses (e.g., analyses that double 
count emissions by summing power sector direct emissions with another 
sector's indirect emissions estimates) is inconsistent with the EPA's 
intent to use these data appropriately to complete facility-level, 
energy efficiency comparisons within discrete sectors. In response to 
comments on the 2009 Proposed Rule regarding the potential double 
counting of emissions reported by power plants and electricity 
purchased downstream from those power plants, the EPA noted that there 
is inherent and intentional double reporting of emissions in a program 
that includes both energy suppliers and energy users (74 FR 16479, 
April 10, 2009), and that both supply- and demand-side data are 
necessary to evaluate and identify the best policy options. However, 
double reporting is not inherently the same as double counting. 
Subparts C (General Stationary Fuel Combustion Sources) and NN 
(Suppliers of Natural Gas and Natural Gas Liquids) are an example in 
the existing GHGRP requirements of double reporting. Double counting is 
likely best characterized as a form of misuse or misunderstanding of 
two reported values, where an analyst could potentially improperly add 
potential emissions (calculated from the subpart NN supplier's data) to 
actual emissions (from the subpart C user's data) and erroneously 
represent the sum of these two values as the total emissions from the 
energy transaction. To mitigate the potential for any such double 
counting by users of part 98 data, the EPA designates subparts as 
either ``direct emitter'' or ``supplier'' subparts. Similarly, in this 
proposal, the EPA has proposed to include a new definition for 
``indirect emissions'' under the proposed subpart B to distinguish any 
associated indirect emissions estimates (that may be derived by users 
of GHGRP reported energy consumption data) from direct emissions 
reported in direct emitter subparts. The demand-side information 
proposed to be collected under this subpart would be used to understand 
the energy intensity of facilities and sectors.
    We also received several comments regarding whether the EPA should 
establish a reporting threshold for the energy consumption source 
category. Commenters were divided on whether or not energy consumption 
should be considered toward the reporting threshold. Some commenters 
supporting the addition of the energy consumption category said that 
applicability should be based on direct emissions only, while others 
said that the reporting threshold should be broadened to also include 
facilities not currently subject to reporting within a part 98 sector 
if a facility uses comparable quantities of energy to facilities 
currently subject to part 98. One commenter responded to the EPA's 
request for comment on whether the approach of limiting applicability 
of an energy consumption source category to facilities that are 
currently subject to the GHGRP would exclude certain sectors that 
consume very large quantities of purchased energy. The commenter 
identified gas compression facilities that replace reciprocating 
engines with electric motors as one type of activity that would be 
excluded under the current thresholds.
    As discussed in section IV.A.3 of this preamble, at this time the 
EPA is proposing to retain the current GHGRP reporting thresholds. 
While the EPA recognizes that some sectors may include facilities 
operating below the current GHGRP reporting thresholds with very large 
energy purchases, only one sector was identified by commenters 
responding to the EPA's request for comment on such excluded 
facilities. Refer to section IV.A.4 of the preamble for further detail 
on the EPA's rationale for proposing to retain the current reporting 
thresholds.
    We received several comments on potential calculation methodologies 
that could be adopted for the energy consumption source category. 
Commenters recommended that methodologies should be consistent with 
ongoing rulemakings and programs by other Federal agencies with 
considerations for renewable energy credits (RECs) and use of location-
based emission factors for indirect emissions estimates. The commenters 
stated that any calculation methodologies used by the EPA should be 
consistent with the Security and Exchange Commission's (SEC) ongoing, 
corporate-level rulemaking for climate-related disclosures. Other 
commenters stated that calculations should be consistent with other 
voluntary and regulatory programs. Some commenters stated that 
calculations should include a location-based approach and use of 
retired RECs.
    As previously noted, at this time the EPA is not proposing to 
require reporters to calculate or report indirect emissions estimates 
from the proposed collection of energy consumption data. In the future, 
if the EPA determines that the purposes of the Clean Air Act would be 
advanced by information gathered through a uniform methodology for 
estimating indirect emissions from energy consumption, the EPA may 
consider established protocols in other voluntary and regulatory 
programs, and address similarities and differences, in any such future 
undertaking.
    We received several comments from stakeholders regarding reporting 
and recordkeeping procedures for the energy consumption source 
category. Commenters stated that the EPA is mistaken about the ease of 
reporting energy consumption data for some facilities that may have 
power purchasing agreements that do not include all required reporting 
elements. One commenter stated that, while individual facilities may 
have electricity meters, uses of electricity within a facility may not 
be separately metered, meaning that it would be difficult to separate 
the electricity purchased to be used in connection with the source 
subject to reporting under the GHGRP from the electricity used for 
purposes that do not fall into a GHGRP reporting subpart. Commenters 
also said that energy consumption records may be considered CBI and 
gathering all the energy consumption records for a large facility would 
impose significant burden on reporters. Other commenters suggested 
reporting requirements that may be useful for converting energy 
consumption data to indirect emissions estimates, and some reporters 
made recommendations for ensuring any future indirect emissions 
estimates developed by the EPA were clearly demarked separately from 
direct emissions estimates.
    The EPA appreciates the commenters suggestions related to indirect 
emissions estimates, but, as stated previously in this preamble 
section, the EPA is not proposing that reporters calculate or report 
indirect emissions estimates. With regard to commenter concerns about 
potential difficulties with reporting energy consumption data, the EPA 
is proposing at this time to limit the energy consumption data to be

[[Page 32889]]

reported to data based on existing billing statements and purchasing 
agreements. The EPA is proposing to require a copy of a representative 
billing statement for each existing or new energy purchasing agreement 
between two counterparties. This information would ensure that all 
reported quantities of energy consumed are consistent with the periodic 
billing statements. The proposed approach for collection of energy 
consumption data would not require the reporting of any information 
that is not readily available to the reporting facility on periodic 
billing statements. Regarding the commenter concern about 
differentiating electricity use between activities supporting the 
industrial activities related to the source reporting direct emissions 
to the GHGRP versus those not related to industrial source activities, 
the EPA is proposing to allow the use of company records or engineering 
judgment to make these estimates.
3. Proposed Definition of Source Category
    We are proposing to define the energy consumption source category 
as direct emitting facilities that: (1) purchase metered electricity or 
metered thermal energy products; (2) are required to report under 
Sec. Sec.  98.2(a)(1), (2), or (3) or are required to resume reporting 
under Sec. Sec.  98.2(i)(1), (2) or (3); and (3) are not eligible to 
discontinue reporting under the provisions at Sec. Sec.  98.2(i)(1) 
(2), or (3). Under proposed 40 CFR 98.28, we are proposing definitions 
for the terms ``metered,'' ``purchased electricity,'' ``purchasing 
agreement,'' and ``thermal energy products'' and the EPA specifically 
requests comments on these proposed definitions. This subpart would 
only apply where existing meters are installed for purchased 
electricity or for purchasing agreements for thermal energy products. 
The definition of ``metered'' clarifies that, for thermal energy 
products purchasing agreements, design parameters would be used for 
reporting energy consumption if real-time operating meters are not 
required by the purchasing agreement. As proposed, this source category 
would not require the installation of meters; however, we are proposing 
that purchased electricity consumers subject to proposed subpart B 
would be required, in certain specified circumstances, to request that 
their electricity delivery service provider ensure any installed 
purchased electricity meter meets minimum accuracy requirements. The 
proposed definition of ``thermal energy products'' for the purposes of 
part 98 subpart B would include metered steam, hot water, hot oil, 
chilled water, refrigerant, or any other medium used to transfer 
thermal energy. Only facilities that are required for that RY to report 
direct emissions under another subpart of the GHGRP (i.e., that meet 
the applicability requirements for reporting direct emissions under 
source categories listed in 40 CFR 98.2(a)(1), (2), or (3) and are not 
eligible to discontinue reporting for that RY under the provisions at 
40 CFR 98.2(i)(1), (2), or (3) (i.e., ``off-ramp''), or that are 
previous reporters that ceased reporting (i.e., ``off-ramped'') but are 
required to resume reporting for that RY under 40 CFR 98.2(i)(1), (2), 
or (3)) and purchase metered electricity or metered thermal energy 
products would be required to report under this subpart. Note, under 
the proposal, the proposed addition of subpart B would not affect the 
eligibility of existing reporters to off-ramp per the requirements of 
40 CFR 98.2(i)(1), (2), or (3), or affect whether the facility must 
resume reporting under those same provisions (i.e., would not factor 
into whether the reporting threshold to resume reporting of 25,000 
mtCO2e per year or more is met for 40 CFR 98.2(i)(1) and 
(2), or for whether operations resumed for 40 CFR 98.2(i)(3)). 
Facilities eligible to off-ramp include a relatively small subset of 
total GHG emissions reported to the GHGRP; therefore, our analysis at 
this time is that collection of energy consumption data from these 
sources would not provide substantial information to the program. As 
discussed further in section IV.A.4 of this preamble, the proposed 
subpart B would also not affect the calculations that certain 
facilities conduct for comparison to the 25,000 mtCO2e per 
year applicability threshold or result in the addition of new reporters 
to the GHGRP.
    The proposed source category does not include the purchase of fuel 
and the associated direct emissions from the use of fuel on site, as 
those are already reported as applicable under existing part 98 
subparts. The proposed source category also does not apply to the use 
of electricity and thermal energy products that are not subject to 
purchasing agreements. While such arrangements are expected to be 
uncommon, some geothermal and biogas energy sources may not be metered 
or may not be subject to purchasing agreements. In order to minimize 
the potential burden on reporters, at this time the EPA is proposing to 
require reporting of only energy consumption data that is commonly 
available in energy billing statements and transactional records 
exchanged pursuant to existing purchasing agreements.
4. Selection of Proposed Reporting Threshold
    As described above, facilities that meet the applicability 
requirements for reporting direct emissions under another source 
category of the GHGRP (and not otherwise eligible to discontinue 
reporting for that RY under the provisions at 40 CFR 98.2(i)(1), (2), 
or (3)) or that are previous reporters that ceased reporting (i.e., 
``off-ramped'') but are required to resume reporting for that RY under 
40 CFR 98.2(i)(1), (2), or (3)), and that purchase metered electricity 
or metered thermal energy products, would be required to report under 
this proposed subpart.
    The EPA also considered requiring reporting based on certain 
CO2e thresholds. In these scenarios, the threshold would 
include both a facility's total direct emissions as well as indirect 
emissions associated with that facility's energy consumption (i.e., 
resulting from purchased metered electricity or thermal energy 
products). Table 4 of this preamble presents the thresholds that the 
EPA considered for this supplemental proposal along with an estimate of 
the number of facilities that would be required to report under each of 
these scenarios and an estimate of the percent of total electricity use 
that would be covered under each option. Note, the EPA does not have 
sufficient data on thermal energy products to estimate the percent of 
total thermal energy products that would be included under each option.

           Table 4--Threshold Analysis for Energy Consumption
------------------------------------------------------------------------
                                                        Percent of total
   Threshold level (mtCO2e)      Estimated number of    electricity use
                                 subpart B reporters        covered
------------------------------------------------------------------------
CO2e facility-wide emissions    Approximately 2,850                  4.3
 of 100,000 metric tons or       (virtually all 2,850
 more.                           facilities are
                                 current GHGRP
                                 reporting
                                 facilities).

[[Page 32890]]

 
CO2e facility-wide emissions    Approximately 11,850                 7.5
 of 25,000 metric tons or more.  (of which 6,450 are
                                 current GHGRP
                                 reporting
                                 facilities).
CO2e facility-wide emissions    49,850 (of which                    14.7
 of 10,000 metric tons or more.  7,050 are current
                                 GHGRP reporting
                                 facilities).
CO2e facility-wide emissions    74,850 (of which                    29.8
 of 1,000 metric tons or more.   7,350 are current
                                 GHGRP reporting
                                 facilities).
Selected Proposed Option: No    7,587 \53\ (the                      7.4
 Threshold; subpart applies to   number of existing
 reporters that meet             direct emitters
 applicability requirements of   reporting for
 other direct emitting           RY2021).
 subparts and that purchase
 energy products.
------------------------------------------------------------------------

    For additional details on the analysis of these thresholds and the 
estimated number of facilities potentially subject to subpart B under 
these scenarios, please see the Technical Support Document for Non-Fuel 
Energy Purchases: Supplemental Proposed Rule for Adding Energy 
Consumption Source Category under 40 CFR part 98, available in the 
docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    \53\ The facility count for the proposed option includes all 
facilities that reported to the EPA in RY2021 under a direct 
emitting subpart or subpart RR (Geologic Sequestration of Carbon 
Dioxide). In reviewing this information for this supplemental 
proposal, the EPA assessed that this facility count includes many 
facilities that do not appear to be required to report under 40 CFR 
part 98. However, the EPA has included all facilities that reported 
to the EPA in RY2021 in this total, as it provides a conservative 
estimate of the number of facilities that would be affected by these 
proposed revisions.
---------------------------------------------------------------------------

    Following our analysis, the EPA is not proposing a certain 
CO2e threshold approach. At this time, the EPA is most 
interested in better understanding the energy intensity of facilities 
and sectors that are required to report their direct emissions under 
the existing GHGRP subparts. For this proposal, we have determined that 
obtaining information on purchased metered electricity or metered 
thermal energy products from direct emitting facilities, which include 
the most energy-intensive industrial sectors, is sufficient at this 
time, as direct emissions currently reported to the GHGRP account for 
approximately 70 percent of all U.S. GHG direct emissions from 
stationary point sources. Adopting a threshold of 25,000, 10,000 or 
1,000 mtCO2e of combined direct and indirect emissions would 
at a minimum add over 4,000 reporters and at a maximum increase the 
number of reporters by nearly an order of magnitude. As shown in Table 
4, the additional electricity data that would result from these 
thresholds would do little to further the objectives of the program at 
this time for the initial purposes of the proposed subpart B. Applying 
the requirements to existing GHGRP direct emitters more effectively 
targets large industrial emitters. Therefore, there are no proposed 
requirements for direct emitting facilities that meet the applicability 
under 40 CFR 98.2(a)(2) to consider indirect emissions from subpart B 
for comparison to a 25,000 mtCO2e threshold (as currently 
directed, as applicable, under 40 CFR 98.2(b)), and no indirect 
emissions from subpart B are proposed to be reported or included in the 
facility's total annual emissions as calculated under 40 CFR 
98.2(c)(4)(i). As such, the proposed subpart B requirements would not 
add new reporters to the GHGRP.
5. Selection of Proposed Calculation Methods
    As discussed in section IV.A.4 of this preamble, we are not 
proposing to require facilities to calculate or report indirect 
emissions estimates associated with purchased metered electricity or 
metered thermal energy products. We have proposed a definition for the 
term ``indirect emissions'' under 40 CFR 98.28 to distinguish this 
attribute of energy consumption from direct emissions reported under 
the direct emitting subparts listed in Tables A-3 and A-4 of part 98. 
In general, the greenhouse gases CO2, CH4, and 
N2O are emitted during the combustion of fuels to generate 
electricity or during the combustion of fuels to produce thermal energy 
products. However, under the proposed requirements, facilities would 
not be required to convert their energy usage into indirect emission 
estimates (i.e., energy-use-to-emissions conversions intended to 
associate offsite, energy production emissions with on-site, non-
emitting energy consumption). The EPA is proposing that facilities 
simply report the quantity of purchased electricity and purchased 
thermal energy products during the reporting year because (1) these 
data are more readily available to facilities; and (2) the EPA does not 
need the energy use to be converted to emissions estimates to better 
understand the energy intensity of facilities and sectors reporting to 
the GHGRP. As previously noted, at this time the EPA is not proposing 
to require reporters to calculate or report indirect emissions 
estimates from the proposed collection of energy consumption data.
6. Selection of Proposed Monitoring, QA/QC, and Verification Methods
    The proposed monitoring and quality assurance/quality control (QA/
QC) requirements would require facilities subject to the new subpart to 
develop a written MEMP. The MEMP would serve to document metering 
equipment that would be used to collect the data required to be 
reported under this subpart. The EPA is proposing that electricity 
meters subject to this subpart must conform to the accuracy 
specifications required by the voluntary standard for electricity 
metering accuracy under the ANSI standards C12.1-2022 Electric Meters--
Code for Electricity Metering, or with another consensus standard 
having accuracy specifications at least as stringent as the cited ANSI 
standard. The ANSI standard is widely referenced in state utility 
commission performance standards governing the accuracy of electric 
meters used for billing calculations. Facilities with meter(s) that do 
not meet either the accuracy specifications in these ANSI standards or 
another, similar consensus standard with accuracy specifications at 
least as stringent as the cited ANSI standard would be required to 
request that the electricity delivery service provider install 
equipment that conforms with either the ANSI standard or another, 
similar consensus standard with accuracy specifications at least as 
stringent as the cited ANSI standard. This ANSI standard is available 
at the following web link: ANSI C12.1-2022--https://webstore.ansi.org/standards/nema/ansic122022.
    We are proposing that thermal energy product metering systems be 
audited at least once every five years and meet accuracy specifications 
in 40 CFR 98.3(i)(2) or (3). We are seeking comment on existing 
industry standards for assessing the accuracy of electric and thermal 
energy monitoring systems, the frequency of audits of these systems, 
and the accuracy specification(s) used

[[Page 32891]]

for thermal energy product metering systems.
    The EPA understands that contracts between host facilities and 
energy producers are governed by clear metering and billing 
requirements. Accordingly, we are seeking comment on our understanding 
that monitoring and recordkeeping systems are already in place for 
purchased energy transactions, and our assessment that the incremental 
reporting burden would be minimal.
7. Selection of Proposed Procedures for Estimating Missing Data
    The EPA is proposing that reporters with missing billing statements 
for purchased energy products must request replacement copies of lost 
statements from their energy delivery service provider. In the event 
that the energy delivery service provider is unable to provide 
replacement copies of billing statements, the facility would be 
required to estimate the data based on the best available estimate of 
the energy use, based on all available data which may affect energy 
usage (e.g., processing rates, operating hours, etc.). The owner or 
operator shall document and keep records of the procedures used for all 
missing data estimates. For example, with respect to electricity 
purchases, if a facility's electrical usage varies by season, it may 
choose to estimate the missing usage data based on the same month in a 
previous year. However, if a facility's electricity usage varies more 
with production levels than with seasons, it would be more appropriate 
for that facility to estimate the missing usage data based on a time 
period during which the facility's production level was similar to the 
production level at the time of the missing data.
    The EPA considered proposing more prescriptive requirements 
regarding procedures for estimating missing data, but ultimately 
concluded that each individual facility is in the best position to 
determine the most appropriate approach for determining the period of 
similar operations. The EPA seeks comment on this approach to 
estimating missing data.
8. Selection of Proposed Data Reporting Requirements
    Under proposed subpart B, facilities would be required to report 
the annual purchases of electricity (in kilowatt hours (kWh)) and 
thermal energy products (in million British thermal units (mmBtu)). 
Facilities would also report supporting information on the energy 
providers and meters used. Under the proposed subpart B, reporters 
would be required to report readily available information from periodic 
billing statements provided by their electricity and thermal energy 
providers including the name of the provider, dates of service, meter 
locations and identifiers, quantities purchased, and billing period 
data such as billing period dates and rate descriptors. In states with 
deregulated markets where the billing statements have separate line 
items for electricity delivery services and electricity supply 
services, the delivery service and supply service providers may be 
different entities. Reporters would also be required to provide a copy 
of one billing statement for each energy delivery service provider of 
purchased energy with the first annual report. If the facility changes 
or adds one or more energy delivery service providers after the first 
reporting year, the annual report would be required to include an 
electronic copy of all pages of one billing statement received from 
each new provider for only the first reporting year of each new 
purchasing agreement. Facilities subject to multiple direct emitter 
subparts would additionally report the fraction of quantities purchased 
that is attributable to each subpart, as estimated by company records 
or engineering judgment. If the periodic billing statement spans two 
reporting years, the quantity of purchased energy would be required to 
be allocated to each year based on either the operational knowledge or 
the number of days of service in each reporting year. Reporters would 
be allowed to exclude purchased electricity as estimated by company 
records or engineering judgment, where: (1) electricity is generated 
outside the facility and delivered into the facility, but the final 
destination and usage is outside of the facility, or (2) electricity is 
consumed by operations or activities that do not support any activities 
reporting direct emissions under this part.
    Please see section VI of this preamble for the EPA's proposed 
confidentiality determinations for these reporting elements. The EPA 
understands that these reporting requirements are readily available to 
the energy purchasing facility on periodic billing statements. The EPA 
also seeks comment on measures that could minimize the burden of 
reporting parameters related to purchased metered electricity or 
metered thermal energy transactions.
    The EPA recognizes that under the proposed reporting requirements, 
the Agency would not receive information on the energy attributes of 
the metered electricity or metered thermal energy products purchased. 
For example, if a facility has purchased a REC which certifies that the 
electricity purchased is generated and delivered to the electricity 
grid from a renewable energy resource, this would not be reflected in 
the data reported to the EPA. We reiterate that the purpose of this 
data collection is to better understand the energy intensity of 
facilities and sectors reporting to the GHGRP, and energy intensity is 
independent from energy attributes. Therefore, we are at this time 
proposing that facilities would report only quantities of energy 
products purchased, as well as supporting information on the service 
provider and meters used.
9. Selection of Proposed Records That Must Be Retained
    The EPA is proposing that facilities must retain (1) copies of all 
purchased electricity or thermal energy products billing statements, 
(2) the results of all required certification and quality assurance 
tests referenced in the MEMP for all purchased electricity meters or 
thermal energy products meters used to develop the energy consumption 
values reported under this part, and (3) maintenance records for all 
monitoring systems, flow meters, and other instrumentation used to 
provide data on consumption of purchased electricity or thermal energy 
products under this part. Maintaining records of information, including 
purchase statements, certifications, quality assurance tests, and 
maintenance records, are necessary to support the verification of the 
energy consumption data reported.
    The EPA is considering further expanding the reporting requirements 
for this proposed subpart to include information on the sources used to 
generate the purchased electricity or thermal energy when this 
information is known to reporters, such as with facilities that have a 
bilateral power purchase agreement with an energy provider. In these 
cases, this information would allow GHGRP data users to more accurately 
estimate the indirect emissions attributable to these purchases as 
compared to using regional grid factors or other less accurate methods. 
The EPA is seeking comments and information related to this potential 
expansion. For electrical energy, the EPA is seeking comment on 
requiring facilities to report the quantity of purchased electricity 
generated by each of the following sources: non-hydropower including 
solar, wind, geothermal and tidal, hydropower, natural gas, oil, coal, 
nuclear, and other. For thermal energy, the EPA is seeking comment on 
requiring facilities to report the quantity of purchased thermal steam

[[Page 32892]]

generated by each of the following sources: solar, geothermal, natural 
gas, oil, coal, nuclear and other. In addition, the EPA is also seeking 
comment on the availability of this data to reporters. In some 
situations, the EPA believes this information would be readily 
available, such as when a bilateral purchase agreement for dedicated 
off-site generation is in place. In most situations, the EPA 
anticipates facilities would not have access to this information, 
however, the requirement would be to report this information only if 
known. This would minimize burden as facilities would not be required 
to acquire any new information from their energy suppliers.

B. Subpart WW--Coke Calciners

1. Rationale for Inclusion in the GHGRP
    For the reasons described in section II.B of this preamble and the 
2022 Data Quality Improvements Proposal, consistent with its authority 
under the CAA, the EPA is proposing to add a new subpart, subpart WW of 
part 98 (Coke Calciners). Coke calcining is a process in which 
``green'' petroleum coke with low metals content (commonly called 
``anode grade petroleum coke'') is heated to high temperatures in the 
absence of air or oxygen for the purpose of removing impurities or 
volatile substances in the green coke. The calcined petroleum coke 
product is a nearly pure carbon material used primarily to make anodes 
for the aluminum, steel, and titanium smelting industries. There are 
approximately 15 coke calcining facilities in the United States. The 
typical coke calcining facility emits 150,000 mt CO2 per 
year. We estimate that coke calcining facilities emit approximately 2 
million mt CO2 per year.\54\ On both an emissions per 
facility basis and an aggregate industry GHG emissions basis, the 
proposed coke calciners subpart is comparable with the GHG emissions 
required to be reported to the GHGRP for several other subparts.
---------------------------------------------------------------------------

    \54\ See Revised Technical Support Document For Coke Calciners: 
Supplemental Proposed Rule For The Greenhouse Gas Reporting Program 
available in the docket for this rulemaking (Docket Id. No. EPA-HQ-
OAR-2019-0424).
---------------------------------------------------------------------------

    Emissions from coke calciners located at a petroleum refinery must 
be reported to the GHGRP under subpart Y of part 98 (Petroleum 
Refineries) using CEMS or a carbon balance method. Some facilities with 
coke calciners report emissions from coke calciners under subpart C of 
part 98 (General Stationary Fuel Combustion Sources) assuming that coke 
is the fuel consumed. This is not accurate because the primary fuel 
used in the calciner is process gas consisting of volatile organic 
compounds driven from the green coke, which have a lower carbon content 
than the green coke. Additionally, this leads to a disparity between 
calculation methods used for coke calciners at petroleum refineries and 
other facilities.
    Creating a subpart specifically to provide GHG calculation methods 
and reporting requirements for coke calciners would clarify the 
applicability of the reporting requirements, improve the accuracy and 
usability of the data, provide consistency in the methods used to 
estimate emissions from coke calciners, and better inform future EPA 
policy under the CAA.
2. Public Comments Received in Request for Comment
    In section IV.E of the 2022 Data Quality Improvements Proposal, the 
EPA requested comment on the addition of coke calcining as a new 
subpart to part 98. The request for comment covered the following 
topics:
     Whether the EPA should add a source category related to 
coke calcining, including information on the total number of facilities 
currently operating coke calciners in the United States;
     What calculation methodologies should be used for purposes 
of part 98 reporting, including the use of CEMS and what information is 
readily available to reporters that do not use CEMS to support 
calculation methodologies; and
     What monitoring requirements should be in place and what 
methodologies are recommended for monitoring and QA/QC.
    This section presents a broad overview of the comments received 
regarding the request for comment on coke calcining.
    The EPA received two comments on the addition of coke calcining as 
a new source category to part 98. One commenter supported the addition 
of the source category to provide consistent reporting of coke calciner 
emissions, but suggested that the EPA allow petroleum refineries to 
continue to report their coke calciner emissions in subpart Y to 
minimize burden to current reporters. The other commenter suggested 
that the new source category was unnecessary because coke calciner 
emissions could be sufficiently reported under subpart C. Upon review 
of these comments, the EPA is proposing to require reporting of coke 
calciner emissions under subpart WW because this proposed approach 
would provide a consistent and more accurate method of estimating 
emissions from coke calciners than subpart C and would not 
significantly alter the burden for existing reporters with coke 
calciners collocated at petroleum refineries.
3. Proposed Definition of the Source Category
    The proposed coke calciner source category consists of processes 
that heat petroleum coke to high temperatures in the absence of air or 
oxygen for the purpose of removing impurities or volatile substances in 
the petroleum coke feedstock. The proposed coke calciner source 
category includes, but is not limited to, rotary kilns or rotary hearth 
furnaces used to calcine petroleum coke and any afterburner or other 
equipment used to treat the process gas from the calciner. The proposed 
source category would include all coke calciners, not just those 
collocated at petroleum refineries, to provide consistent requirements 
for all coke calciners.
4. Selection of Proposed Reporting Threshold
    The EPA considered various options for reporting thresholds 
including ``all-in'' (no threshold), as well as emissions-based 
thresholds of 10,000 mtCO2e, 25,000 mtCO2e, and 
100,000 mtCO2e. Table 5 of this preamble illustrates the 
estimated process and combustion CO2 emissions, and 
facilities, that would be covered nationally under each scenario.

                                 Table 5--Threshold Analysis for Coke Calciners
----------------------------------------------------------------------------------------------------------------
                                                         Emissions covered              Facilities covered
            Threshold level (mtCO2e)             ---------------------------------------------------------------
                                                     mtCO2e/yr        Percent         Number          Percent
----------------------------------------------------------------------------------------------------------------
100,000.........................................       1,970,000            98.5              14              93
25,000..........................................       2,000,000             100              15             100
10,000..........................................       2,000,000             100              15             100

[[Page 32893]]

 
All-in (no threshold)...........................       2,000,000             100              15             100
----------------------------------------------------------------------------------------------------------------

    Because coke calciners are large emission sources, they are 
expected to emit over the 25,000 mtCO2e threshold generally 
required to report under existing GHGRP subparts with thresholds, and 
nearly all of them are also projected to exceed the 100,000 
mtCO2e threshold. Therefore, the EPA projects that there are 
limited differences in the number of reporting facilities based on any 
of the emission thresholds considered. For this reason, the EPA is 
proposing to include the coke calciner source category as an ``all-in'' 
subpart (i.e., regardless of their emissions profile), which would 
avoid the need for facilities to calculate whether their emissions 
exceed the threshold and the associated burden to do so, while 
continuing to focus the Agency's efforts on collecting information from 
facilities with larger total emissions.
5. Selection of Proposed Calculation Methods
    Coke calciners primarily emit CO2, but also have 
CH4 and N2O emissions as part of the process gas 
combustion process. Subpart Y (Petroleum Refineries) includes two 
directly applicable methods for estimating GHG (specifically 
CO2) emissions from coke calciners. These are (1) the CEMS 
method (using CO2 concentration and total volumetric flow 
rate of the process vent gas to calculate emissions) and (2) the carbon 
mass balance method [see equation Y-13 of 40 CFR 98.253(g)(2)]. In 
subpart Y, if a qualified CEMS is in place, the CEMS must be used. 
Otherwise, the facility can elect to install a CEMS or elect to use the 
carbon mass balance method. Subpart Y also includes methods for 
estimating CH4 and N2O emissions based on the 
CO2 emissions.
    To support this proposal, we conducted an updated review of 
calculation methods applicable for coke calciners as documented in the 
Revised Technical Support Document For Coke Calciners: Supplemental 
Proposed Rule For The Greenhouse Gas Reporting Program, available in 
the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
    Option 1. This approach directly measures emissions using a CEMS. 
The CEMS would measure CO2 concentration and total exhaust 
gas flow rate for the combined process and combustion source emissions. 
CO2 mass emissions would be calculated from these measured 
values using equation C-6 and, if necessary, equation C-7 in 40 CFR 
98.33(a)(4).
    Option 2. This approach is a carbon mass balance method using the 
carbon content of the green and calcined coke. The methodology is the 
same as current equation Y-13 of 40 CFR 98.253(g)(2) used for coke 
calcining processes collocated at petroleum refineries.
    Option 3. The methane in green coke method is based on use of a 
fixed methane content in the coke of 0.035 mass fraction and uses mass 
reduction in the quantity of coke fed to the process (corrected for 
moisture, volatile, and sulfur content) and the quantity of coke 
leaving the process (corrected for sulfur content). It is expected that 
coke calcine operators could just as easily determine the carbon 
content of the green and calcined coke and use the more direct carbon 
balance method.
    Option 4. The vapor combustion method relies on analysis of carbon 
content of the gas stream inlet to the vapor combustion unit. 
CO2 emissions are calculated assuming non-CO2 
carbon is combusted and converted to CO2 at the efficiency 
of the combustion system, and assuming 100 percent of the 
CO2 in the inlet gas stream is emitted. The difficulty with 
applying this method for coke calciners is collecting representative 
samples of the process off-gas prior to the afterburner.
    Option 5. The coke combustion method is based on the method that 
some non-refinery facilities report emissions from coke calcining 
operations under 40 CFR part 98, subpart C. This method can be applied 
using either the default high heat values and emission factors in Table 
C-1 to subpart C of part 98 for petroleum coke (Tier 1 or 2) or 
measured carbon content of the green coke (Tier 3) and attribute the 
mass reduction of coke as petroleum coke combusted. This method does 
not correct for the fact that the volatile matter has a lower carbon 
content than the green petroleum coke and so is likely to produce 
CO2 emission estimates that are biased high.
    Proposed option. Following this review, we maintain that the CEMS 
(Option 1) and carbon mass balance methods (Option 2) are the most 
accurate methods for determining CO2 emissions from coke 
calciners. Several existing coke calciners currently operate a CEMS. 
For those facilities that do not have a qualified CEMS in-place, the 
carbon mass balance method provides an accurate approach for 
determining CO2 emissions using data that is expected to be 
routinely monitored by coke calcining facilities. Furthermore, using 
these methods allows petroleum refineries with coke calciners to 
maintain their calculation methods. Additional detail on the 
calculation methods reviewed are available in, Revised Technical 
Support Document For Coke Calciners: Supplemental Proposed Rule For The 
Greenhouse Gas Reporting Program available in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
    We note that the CEMS method as implemented in subpart Y of part 98 
requires reporters to determine CO2 emissions from auxiliary 
fuel use discharged in the coke calciner exhaust stack using methods in 
subpart C of part 98, and to subtract those emissions from the measured 
CEMS emissions to determine the process CO2 emissions, 
comparable to the emissions determined using the carbon mass balance 
approach. We are proposing to retain this requirement and have the 
auxiliary fuel-related emissions reported in subpart C. We are also 
proposing to require reporters using the carbon mass balance approach 
to also determine auxiliary fuel use in the coke calciner (and 
afterburner) and estimate and report the CO2 emissions from 
this fuel use in subpart C.
    We are proposing that coke calciners also estimate process 
CH4 and N2O emissions based on the total 
CO2 emissions determined for the coke calciner and the ratio 
of the default CO2 emission factor for petroleum coke in 
Table C-1 to subpart C of part 98 to the default CH4 and 
N2O emission factors for petroleum products in Table C-2 to 
subpart C of part 98. The proposed approach is consistent with the 
requirements for determining these GHG emissions for coke calciners in 
subpart Y. We are proposing to include these GHG emissions in the new 
coke

[[Page 32894]]

calcining subpart to fully account for GHG emissions from coke 
calciners.
6. Selection of Proposed Monitoring, QA/QC, and Verification 
Requirements
    We are proposing two separate monitoring methods: direct 
measurement and a mass balance emission calculation.
    Proposed option for direct measurement using CEMS. The proposed 
CEMS method requires both a continuous CO2 concentration 
monitor and a continuous volumetric flow monitor. We are proposing 
reporters required to or electing to use CEMS must install, operate, 
and calibrate the monitoring system according to subpart C (General 
Stationary Fuel Combustion Sources), which is consistent with CEMS 
requirements in other GHGRP subparts. We are proposing that all 
CO2 CEMS and flow rate monitors used for direct measurement 
of GHG emissions should comply with QA/QC procedures for daily 
calibration drift checks and quarterly or annual accuracy assessments, 
such as those provided in Appendix F to part 60 or similar QA 
procedures. We are proposing these requirements to ensure the quality 
of the reported GHG emissions and to be consistent with the current 
requirements for CEMS measurements within subparts A (General 
Provisions) and C of the GHGRP.
    Proposed option for mass balance calculation. The carbon mass 
balance method requires monitoring of mass quantities of green coke fed 
to the process, calcined coke leaving the process, and coke dust 
removed from the process by dust collection systems. It also requires 
periodic determination of carbon content of the green and calcined 
coke. For coke mass measurements, we are proposing that the measurement 
device be calibrated according to the procedures specified by the 
updated Specifications, Tolerances, and Other Technical Requirements 
For Weighing and Measuring Devices, NIST Handbook 44 (2022) or the 
procedures specified by the manufacturer. We are proposing that the 
measurement device be recalibrated either biennially or at the minimum 
frequency specified by the manufacturer. We are proposing these 
requirements to ensure the quality of the reported GHG emissions and to 
be consistent with the current requirements for coke calciner mass 
measurements within subpart Y.
    For carbon content of coke measurements, we are proposing that the 
owner or operator follow approved analytical procedures and maintain 
and calibrate instruments used according to manufacturer's instructions 
and to document the procedures used to ensure the accuracy of the 
measurement devices used. We are proposing these requirements to ensure 
the quality of the reported GHG emissions and to be consistent with the 
current requirements for coke calciner mass measurements within subpart 
Y.
    We are proposing that these determinations be made monthly. Current 
requirements in subpart Y do not specify a monitoring frequency, such 
that only the annual mass of coke entering and leaving the process 
needs to be determined. It is expected that facilities likely determine 
these mass quantities on a daily or more frequent basis, so it would be 
minimal burden for facilities to determine and record these quantities 
monthly. Similarly, facilities are expected to regularly determine the 
carbon content of the green coke feedstock, so determining and 
reporting the monthly average carbon content of green and calcined coke 
would require limited additional effort compared to determining and 
reporting annual values. If carbon content measurements are made more 
often than monthly, we are proposing that all measurements made within 
the calendar month should be used to determine the average for the 
month. Conducting the calculation monthly would improve accuracy 
compared to annual or quarterly calculations. It also improves the 
verification process for the reported data. Because we expect reporters 
will have this data available on a monthly or more frequent basis, we 
are proposing to require reporters to conduct the calculations monthly. 
We solicit comment on whether quarterly averages for composition and 
quantity data would adequately account for potential variations in 
carbon content, production rates, and other factors that may affect the 
estimated GHG emissions.
7. Selection of Proposed Procedures for Estimating Missing Data
    Whenever a quality-assured value of a required parameter is 
unavailable (e.g., if a CEMS malfunctions during unit operation or if a 
required fuel sample is not taken), we are proposing that a substitute 
data value for the missing parameter shall be used in the calculations. 
For missing CEMS data, we are proposing that the missing data 
procedures in subpart C be used. The subpart C missing data procedures 
require the substitute data value to be the best available estimate of 
the parameter, based on all available process data (e.g., electrical 
load, steam production, operating hours, etc.). For each missing value 
of mass or carbon content of coke, we are proposing that the average of 
the data measurements before and after the missing data period be used 
to calculate the emissions during the missing data period because this 
is expected to provide the more accurate estimate for the missing 
value. If, for a particular parameter, no quality-assured data are 
available prior to the missing data incident, we are proposing that the 
substitute data value should be the first quality-assured value 
obtained after the missing data period. Similarly, if no quality-
assured data are available after the missing data incident, we are 
proposing that the substitute data value should be the most recently 
acquired quality-assured value obtained prior to the missing data 
period. Missing data procedures are applicable for CEMS measurements 
when using the CEMS method and for mass of coke measurements and carbon 
content measurements of green and calcined coke when using the carbon 
mass balance method. These missing data procedures were selected 
because they are consistent with current GHGRP methods and because they 
are expected to provide the most accurate values for the missing data.
8. Selection of Proposed Data Reporting Requirements
    For coke calcining units, we are proposing that the owner and 
operator shall report general information about the coke calciner (unit 
ID number and maximum rated throughput of the unit), the method used to 
calculate GHG emissions, and the calculated CO2, 
CH4, and N2O annual emissions for each unit, 
expressed in metric tons of each pollutant emitted. We are also 
proposing to require the owner and operator to report the annual mass 
of green coke fed to the coke calcining unit, the annual mass of 
marketable petroleum coke produced by the coke calcining unit, the 
annual mass of petroleum coke dust removed from the process through the 
dust collection system of the coke calcining unit, the annual average 
mass fraction carbon content of green coke fed to the unit, and the 
annual average mass fraction carbon content of the marketable petroleum 
coke produced by the coke calcining unit.
9. Selection of Proposed Records That Must Be Retained
    We are proposing that facilities maintain records documenting the 
procedures used to ensure the accuracy of the measurements of all 
reported parameters, including but not limited to, calibration of 
weighing equipment, flow meters, and other measurement devices. The 
estimated accuracy of

[[Page 32895]]

measurements made with these devices must also be recorded, and the 
technical basis for these estimates must be provided. We are proposing 
these requirements based on the provisions in subpart A of part 98. 
Maintaining records of information used to determine reported GHG 
emissions is necessary to allow us to verify that GHG emissions 
monitoring and calculations were done correctly.
    For the coke calciners source category, we are proposing that the 
verification software specified in 40 CFR 98.5(b) would be used to 
fulfill the recordkeeping requirements for the following five data 
elements:
     Monthly mass of green coke fed to the coke calcining unit;
     Monthly mass of marketable petroleum coke produced by the 
coke calcining unit;
     Monthly mass of petroleum coke dust removed from the 
process through the dust collection system of the coke calcining unit;
     Average monthly mass fraction carbon content of green coke 
fed to the coke calcining unit; and
     Average monthly mass fraction carbon content of marketable 
petroleum coke produced by the coke calcining unit.
    Maintaining records of information used to determine reported GHG 
emissions is necessary to allow us to verify that GHG emissions 
monitoring and calculations were done correctly.

C. Subpart XX--Calcium Carbide Production

1. Rationale for Inclusion in the GHGRP
    For the reasons described in section II.B and the 2022 Data Quality 
Improvements Proposal, consistent with its authority under the CAA, the 
EPA is proposing to add a new subpart for facilities engaged in the 
manufacturing of calcium carbide to quantify and report GHG emissions 
from their processes and from fuel combustion. Calcium carbide 
production is currently identified as a potential source of GHG 
emissions in the IPCC 2006 Guidelines.\55\ Although we are aware of at 
least one active calcium carbide production facility in the United 
States, emissions from calcium carbide production are currently not 
explicitly accounted for in the GHGRP. The one current producer of 
calcium carbide in the United States is Carbide Industries, LLC, 
located in Louisville, KY. Carbide Industries, LLC currently reports 
their process GHG emissions under subpart K of part 98 (Ferroalloy 
Production) (e-GGRT identifier 1005537), although there is no 
requirement for them to report under subpart K because they do not meet 
the definition of the subpart. They also report combustion emissions 
under subpart C of part 98 (General Stationary Fuel Combustion 
Sources), which includes CO2 emissions from an acetylene 
flare and other combustion sources. Because the subpart K calculation 
methodology is not intended for calcium carbide production processes, 
we anticipate that the emissions as estimated under this methodology do 
not accurately account for the CO2 emissions from the 
calcium carbide process.
---------------------------------------------------------------------------

    \55\ IPCC Guidelines for National Greenhouse Gas Inventories, 
Volume 3, Industrial Processes and Product Use, Mineral Industry 
Emissions. 2006. www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/3_Volume3/V3_2_Ch2_Mineral_Industry.pdf.
---------------------------------------------------------------------------

    Therefore, we are proposing the addition of a calcium carbide 
production source category to the GHGRP to better align with 
intergovernmental approaches to estimating emissions and to provide 
more accurate applicability requirements and emissions estimation 
methodologies for these types of facilities. Further, the proposed 
requirements would improve the completeness of the data collected under 
the GHGRP, add to the EPA's understanding of the GHG emissions from 
these sources, and better inform future EPA policy under the CAA. Once 
collected, such data would also be available to and improve on the 
estimates provided in the Inventory, by incorporating the 
recommendations of the 2006 IPCC guidelines.
2. Public Comments Received in Request for Comment
    In section IV.C of the 2022 Data Quality Improvements Proposal, the 
EPA requested comment on the addition of calcium carbide production as 
a new subpart to part 98. The request for comment covered the following 
topics:
     Whether the EPA should add a source category related to 
calcium carbide production;
     Information related to the source category definition, 
including information to contextualize potential reporters and, where 
acetylene production from calcium carbide occurs at the same facility, 
whether the EPA should account for emissions from these sources;
     Information on how emissions could be estimated at a 
facility-level based on methods available in the 2006 IPCC guidelines;
     What monitoring requirements should be in place; and
     What reporting requirements should be in place that would 
help to support emissions estimates.
    This section presents a broad overview of the comments received 
regarding the request for comment on calcium carbide production.
    We received one comment on the addition of a source category for 
calcium carbide production, stating that the addition was unnecessary. 
The commenter noted that the EPA already receives emissions data from 
the one U.S. calcium carbide production facility that voluntarily 
reports to part 98 under existing subpart K (Ferroalloy Production), 
and therefore a new source category is redundant. The EPA is proposing 
the addition of a new source category for calcium carbide production to 
provide accurate applicability requirements, require data specific to 
the calcium carbide industry, and better align with international 
emissions evaluations. In considering the comment, we think this 
proposal is appropriate in part because we have assessed that it is 
technically inconsistent with our regulations for a calcium carbide 
facility to voluntarily report under subpart K. Receiving data for a 
facility that does not align with the source category of subpart K 
presents potential data quality issues for the EPA that would be 
addressed under the proposed new subpart. Additionally, as discussed in 
the June 21, 2022 proposed rule, the data we would receive from these 
sources would better align the data collected under GHGRP with the 2006 
IPCC Guidelines.
    We received one comment on the potential calculation methodology 
for the calcium carbide production source category, stating that the 
adjustment factor within the carbon consumption method should be 
changed from 0.33 (for 100 percent pure calcium carbide) to 0.28, 
because commercial calcium carbide is not a pure product. As discussed 
in section IV.C.5 of this preamble, the EPA is requesting additional 
information regarding the purity level of commercial calcium carbide.
3. Proposed Definition of the Source Category
    We propose defining calcium carbide production to include any 
process that produces calcium carbide. Calcium carbide is an industrial 
chemical manufactured from lime (CaO) and carbon, usually petroleum 
coke, by heating the mixture to 2,000 to 2,100 [deg]C (3,632 to 3,812 
[deg]F) in an electric arc furnace. During the production of calcium 
carbide, the use of carbon-

[[Page 32896]]

containing raw materials (petroleum coke) results in emissions of 
CO2.
    The largest application of calcium carbide is producing acetylene 
(C2H2) by reacting calcium carbide with water. 
The production of acetylene from calcium carbide results in the 
emissions of CO2. Although we considered accounting for 
emissions from the production of acetylene at calcium carbide 
facilities in the 2022 Data Quality Improvements Proposal, we 
determined that acetylene is not produced at the one known plant that 
produces calcium carbide. Therefore, we are not proposing that 
CO2 emissions from the production of acetylene from calcium 
carbide be reported under proposed subpart XX. Additional background 
information about GHG emissions from the calcium carbide production 
source category is available in the Revised Technical Support Document 
for Calcium Carbide: Supplemental Proposed Rule For The Greenhouse Gas 
Reporting Program, available in the docket for this rulemaking (Docket 
Id. No. EPA-HQ-OAR-2019-0424).
4. Selection of Proposed Reporting Threshold
    In developing the reporting threshold for calcium carbide 
production, we considered emissions-based thresholds of 10,000 
mtCO2e, 25,000 mtCO2e and 100,000 
mtCO2e. Requiring all facilities to report (no threshold) 
was also considered. Process emissions for 2020 from the one calcium 
carbide production facility were estimated to be 41,244 
mtCO2e/yr. Including their reported combustion emissions, 
total emissions in 2020 were 46,878 mtCO2e. Table 6 of this 
preamble illustrates the emissions and facilities that would be covered 
under these various thresholds.

                           Table 6--Threshold Analysis for Calcium Carbide Production
----------------------------------------------------------------------------------------------------------------
                                                         Emissions covered              Facilities covered
            Threshold level (mtCO2e)             ---------------------------------------------------------------
                                                     mtCO2e/yr        Percent         Number          Percent
----------------------------------------------------------------------------------------------------------------
100,000.........................................               0               0               0               0
25,000..........................................          46,878             100               1             100
10,000..........................................          46,878             100               1             100
All-in (no threshold)...........................          46,878             100               1             100
----------------------------------------------------------------------------------------------------------------

    Following our analysis, we are proposing that all calcium carbide 
manufacturing facilities be required to report under the GHGRP. The 
current estimate of emissions from the known facility exceeds 25,000 
mtCO2e by a factor of about 1.9. Therefore, in order to 
simplify the rule and avoid the need for the facility to calculate and 
report whether the facility exceeds the threshold value, we propose 
that all facilities report in this source category. Requiring all 
facilities to report captures 100 percent of emissions, and small 
temporary changes to the facility would not affect reporting 
requirements.
    For a full discussion of the threshold analysis, please refer to 
the Revised Technical Support Document for Calcium Carbide: 
Supplemental Proposed Rule For The Greenhouse Gas Reporting Program, 
available in the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-
2019-0424).
5. Selection of Proposed Calculation Methods
    We are proposing to require facilities to report the process 
CO2 emissions from each calcium carbide process unit or 
furnace used for production of calcium carbide. We reviewed existing 
methodologies for estimating process related GHG emissions including 
those of the 2006 IPCC Guidelines for National Greenhouse 
Inventories,\56\ the European Union,\57\ Canada's Greenhouse 
Quantification Requirements,\58\ and the EPA's GHGRP. The methodologies 
reviewed are detailed in the Revised Technical Support Document for 
Calcium Carbide: Supplemental Proposed Rule For The Greenhouse Gas 
Reporting Program (available in the docket for this rulemaking, Docket 
Id. No. EPA-HQ-OAR-2019-0424), and generally fall into one of the 
following options.
---------------------------------------------------------------------------

    \56\ IPCC Guidelines for National Greenhouse Gas Inventories, 
Volume 3, Industrial Processes and Product Use, Mineral Industry 
Emissions. 2006. https://www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/3_Volume3/V3_2_Ch2_Mineral_Industry.pdf.
    \57\ European Union (EU). Commission Implementing Regulation 
(EU) 2018/2066 of 19 December 2018 on the Monitoring and Reporting 
of Greenhouse Gas Emissions Pursuant to Directive 2003/87/EC of the 
European Parliament and of the Council and Amending Commission 
Regulation (EU) No. 601/2012. January 1, 2021. Available at: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:02018R2066-20210101&from=EN.
    \58\ Environment and Climate Change Canada (ECCC). Canada's 
Greenhouse Gas Quantification Requirements. Version 4.0. December 
2020. Available at: http://publications.gc.ca/collections/collection_2021/eccc/En81-28-2020-eng.pdf.
---------------------------------------------------------------------------

    Option 1. Apply a default emission factor to calcium carbide 
output, or production. Generally, this method is less accurate as it 
involves multiplying production data by an emission factor that is 
likely a default value based on carbon content (i.e., percentage of 
petroleum coke content that is carbon) assumptions. This method 
involves multiplying the amount of calcium carbide produced by the 
appropriate default emission factor from the 2006 IPCC Guidelines. This 
method would not account for facility-specific variances of process 
inputs or outputs.
    While we included an adjustment factor of 0.33 in the carbon 
consumption method provided in the Revised Technical Support Document 
for Calcium Carbide: Supplemental Proposed Rule For The Greenhouse Gas 
Reporting Program (available in the docket for this rulemaking, Docket 
Id. No. EPA-HQ-OAR-2019-0424), a factor of 0.28 was suggested by one 
commenter. The EPA is requesting additional information regarding the 
purity level of commercial calcium carbide and data supporting the 
suggested factor of 0.28.
    Option 2. The carbon balance option, which is the IPCC Tier 3 
approach, is generally more accurate as it involves measuring the 
consumption of specific process inputs and process outputs and the 
amounts of these materials consumed or produced. This method requires 
that the carbon content and the mass of carbonaceous materials input to 
and output from the process be determined. Carbon contents of materials 
are determined through the analysis of samples of the material or from 
information provided by the material suppliers. Also, the quantities of 
these materials consumed and produced during production would be 
measured and recorded. CO2 emissions are estimated by 
multiplying the carbon content of each input and output material by the 
corresponding mass. The difference between the calculated total

[[Page 32897]]

carbon input and the total carbon output is the estimated 
CO2 emissions.
    Option 3. Direct measurement of using CEMS. For configurations in 
which the process off-gases are contained within a stack or vent, 
direct measurement of the CO2 emissions can be made by 
continuously measuring the off-gas stream CO2 concentration 
and flow rate using a CEMS. Using a CEMS, the total CO2 
emissions tabulated from the recorded emissions measurement data would 
be reported annually.
    Proposed option. We are proposing two different methods for 
quantifying GHG emissions from calcium carbide manufacturing, depending 
on current emissions monitoring at the facility. Under the proposed 
rule, if a qualified CEMS is in place, the CEMS must be used. 
Otherwise, under the proposed rule, the facility can elect to either 
install a CEMS or elect to use the carbon mass balance method.
    CEMS method (Option 3). Under the proposed rule, facilities with an 
existing CEMS that meet the requirements outlined in 40 CFR part 98, 
subpart C would be required to use CEMS to estimate combined process 
and combustion CO2 emissions. Facilities would be required 
to follow the requirements of 40 CFR part 98, subpart C to estimate all 
CO2 emissions from the industrial source. Facilities would 
be required to follow 40 CFR part 98, subpart C to estimate emissions 
of CO2, CH4, and N2O from stationary 
combustion.
    Carbon balance method (Option 2). For facilities that do not have 
CEMS that meet the requirements of 40 CFR part 98 subpart C, the 
proposed monitoring method is Option 2, the carbon balance method. For 
any stationary combustion units included at the facility, facilities 
would be required to follow the existing requirements at 40 CFR part 
98, subpart C to estimate emissions of CO2, CH4, 
and N2O from stationary combustion.
    Use of facility specific information under Option 2 is consistent 
with IPCC Tier 3 methods and is the preferred method for estimating 
emissions for other GHGRP sectors. Any additional burden associated 
with material measurement required for the carbon balance would be 
small in relation to the increased accuracy expected from using this 
site-specific information. Among the non-CEMS options, we are proposing 
Option 2 because it has the lowest uncertainty.
6. Selection of Proposed Monitoring, QA/QC, and Verification 
Requirements
    We are proposing two separate monitoring methods: direct 
measurement and a mass balance emission calculation.
    Proposed option for direct measurement using CEMS. For facilities 
where process emissions and/or combustion GHG emissions are contained 
within a stack or vent, facilities can take direct measurement of the 
GHG concentration in the stack gas and the flow rate of the stack gas 
using a CEMS. Under the proposed rule, if facilities use an existing 
CEMS to meet the monitoring requirements, they would be required to use 
CEMS to estimate CO2 emissions. Where the CEMS capture all 
combustion- and process-related CO2 emissions, facilities 
would be required to follow the requirements of 40 CFR part 98, subpart 
C to estimate emissions.
    A CEMS continuously withdraws and analyzes a sample of the stack 
gas and continuously measures the GHG concentration and flow rate of 
the total exhaust stack gas. The emissions are calculated from the 
CO2 concentration and the flow rate of the stack gas. The 
proposed CEMS method requires both a continuous CO2 
concentration monitor and a continuous volumetric flow monitor. To 
qualify as a CEMS, the monitors would be required to be installed, 
operated, and calibrated according to subpart C (General Stationary 
Fuel Combustion Sources) of the GHGRP (40 CFR 98.33(a)(4)), which is 
consistent with CEMS requirements in other GHGRP subparts.
    Proposed option for mass balance calculation. For facilities using 
the carbon mass balance method, we are proposing that the facility must 
determine the annual mass for each material used for the calculations 
of annual process CO2 emissions by summing the monthly mass 
for the material determined for each month of the calendar year. The 
monthly mass may be determined using plant instruments used for 
accounting purposes, including either direct measurement of the 
quantity of the material placed in the unit or by calculations using 
process operating information.
    For the carbon content of the materials used to calculate process 
CO2 emissions, we are proposing that the owner or operator 
determine the carbon content using material supplier information or 
collect and analyze at least three representative samples of the 
material inputs and outputs each year. The proposed rule would require 
the carbon content be analyzed at least annually using standard ASTM 
methods, including their QA/QC procedures. To reduce burden, we are 
proposing that if a specific process input or output contributes less 
than one percent of the total mass of carbon into or out of the 
process, you do not have to determine the monthly mass or annual carbon 
content of that input or output.
7. Selection of Proposed Procedures for Estimating Missing Data
    We are proposing the use of substitute data whenever a quality-
assured value of a parameter is used to calculate emission is 
unavailable, or ``missing.'' If the carbon content analysis of carbon 
inputs or outputs is missing, we are proposing the substitute data 
value would be based on collected and analyzed representative samples 
for average carbon contents. If the monthly mass of carbon-containing 
inputs and outputs is missing, we are proposing the substitute data 
value would be based on the best available estimate of the mass of the 
inputs and outputs from all available process data or data used for 
accounting purposes, such as purchase records. The likelihood for 
missing process input or output data is low, as businesses closely 
track their purchase of production inputs. These missing data 
procedures are the same as those for the ferroalloy production source 
category, subpart K of part 98, under which the existing U.S. calcium 
carbide production facility currently reports.
8. Selection of Proposed Data Reporting Requirements
    We propose that each carbon carbide production facility report the 
annual CO2 emissions from each calcium carbide production 
process, as well as any stationary fuel combustion emissions. In 
addition, we propose that additional information that forms the basis 
of the emissions estimates, along with supplemental data, also be 
reported so that we can understand and verify the reported emissions. 
All calcium carbide production facilities would be required to report 
their annual production and production capacity, total number of 
calcium carbide production process units, annual consumption of 
petroleum coke, each end use of any calcium carbide produced and sent 
off site, and, if the facility produces acetylene, the annual 
production of acetylene, the quantity of calcium carbide used for 
acetylene production at the facility, and the end use of the acetylene 
produced on-site. We propose reporting the end use of calcium carbide 
sent off site, as well as acetylene production information for current 
or future calcium carbide production facilities, to inform future 
Agency policy under the CAA. Collection of this information would

[[Page 32898]]

also better synchronize use of the GHGRP data in Inventory reporting 
based on the 2006 IPCC Guidelines. While the only known calcium carbide 
facility does not currently produce acetylene on site, it is possible 
that this facility or other facilities would do so in the future. If a 
facility uses CEMS to measure their CO2 emissions, they 
would be required to also report the identification number of each 
process unit. If a CEMS is not used to measure CO2 
emissions, the facility would also report the method used to determine 
the carbon content of each material for each process unit, how missing 
data were determined, and the number of months missing data procedures 
were used.
9. Selection of Proposed Records That Must Be Retained
    Maintaining records of information used to determine reported GHG 
emissions is necessary to allow us to verify that GHG emissions 
monitoring and calculations were done correctly. If a facility uses a 
CEMS to measure their CO2 emissions, they would be required 
to record the monthly calcium carbide production from each process unit 
and the number of monthly and annual operating hours for each process 
unit. If a CEMS is not used, the facility would be required to retain 
records of monthly production, monthly and annual operating hours, 
monthly quantities of each material consumed or produced, and carbon 
content determinations.
    We are proposing that the owner or operator maintain records of how 
measurements are made including measurements of quantities of materials 
used or produced and the carbon content of process input and output 
materials. The procedures for ensuring accuracy of measurement methods, 
including calibration, would be recorded.
    The proposed rule would also require the retention of a record of 
the file generated by the verification software specified in 40 CFR 
98.5(b) including:
     carbon content (percent by weight expressed as a decimal 
fraction) of the reducing agent (petroleum coke), carbon electrode, 
product produced, and non-product outgoing materials; and
     annual mass (tons) of the reducing agent (petroleum coke), 
carbon electrode, product produced, and non-product outgoing materials.
    Maintaining records of information used to determine reported GHG 
emissions is necessary to allow us to verify that GHG emissions 
monitoring and calculations were done correctly.

D. Subpart YY--Caprolactam, Glyoxal, and Glyoxylic Acid Production

1. Rationale for Inclusion in the GHGRP
    For the reasons described in section II.B and the 2022 Data Quality 
Improvements Proposal, the EPA is proposing to add a new subpart, 
subpart YY of part 98 (Caprolactam, Glyoxal, and Glyoxylic Acid 
Production). Caprolactam, glyoxal, and glyoxylic acid production 
facilities are identified as a potential important source of GHG 
emissions, specifically N2O, in the IPCC 2006 
Guidelines,\59\ which provides limited methodologies for calculating 
emissions from these sources. There are approximately two caprolactam 
facilities operating in the United States, and likely two to four 
facilities that produce glyoxal and glyoxylic acid. However, the 
emissions from these caprolactam, glyoxal, and glyoxylic production 
operations are currently not explicitly accounted for in the GHGRP. 
Currently, two caprolactam production facilities only report combustion 
emissions under subpart C (General Stationary Fuel Combustion Sources).
---------------------------------------------------------------------------

    \59\ IPCC 2006. IPCC Guidelines for National Greenhouse Gas 
Inventories, Volume 3, Industrial Processes and Product Use. Chapter 
3, Chemical Industry Emissions. 2006. www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/3_Volume3/V3_3_Ch3_Chemical_Industry.pdf.
---------------------------------------------------------------------------

    Therefore, we are proposing the addition of a new source category 
to the GHGRP for caprolactam, glyoxal, and glyoxylic acid production 
sources consistent with our authority under the CAA to better align 
with intergovernmental guidance on emissions estimation and to provide 
clear applicability requirements and emissions estimation methodologies 
for these types of facilities. This new subpart would improve the 
completeness of the data collected under the GHGRP, add to the EPA's 
understanding of the GHG emissions from these sources, and better 
inform future EPA policy under the CAA. Once collected, such data would 
also be available to and improve on the estimates provided in the 
Inventory, by incorporating the recommendations of the 2006 IPCC 
guidelines. Grouping these three organic compounds together into one 
source category for GHGRP purposes would be reasonable because the 2006 
IPCC guidelines methodology for estimating GHG emissions from the 
production of these compounds does the same.
    We are requesting comment on the level of production of glyoxal and 
glyoxylic acid in the United States and whether production of glyoxal 
and glyoxylic acid are expected to increase in the future.
2. Public Comments Received in Request for Comment
    In section IV.D of the 2022 Data Quality Improvements Proposal, the 
EPA requested comment on the addition of caprolactam, glyoxal, and 
glyoxylic acid production as a new subpart to part 98. The request for 
comment covered the following topics:
     Whether the EPA should add a source category;
     Information related to source category definitions, 
calculation methodologies, and reporting requirements;
     Whether there are any glyoxal and/or glyoxylic acid 
production facilities currently operating in the United States;
     Whether facilities have installed abatement equipment;
     Which information or inputs for each calculation 
methodology is readily available;
     Information on the mechanisms that generate CO2 
emissions from glyoxal and glyoxylic acid production;
     Available monitoring methodologies and quality assurance 
procedures that should be used; and
     Data that are readily available for reporting that would 
help to support emissions estimates.
    We received no comments on the addition of a source category 
related to caprolactam, glyoxal, and glyoxylic acid production. For the 
reasons described in section IV.D.1 of this preamble, we are proposing 
to add new subpart YY for caprolactam, glyoxal, and glyoxylic acid 
production based on additional information gathered by the Agency 
following the publication of the 2022 Data Quality Improvements 
Proposal. The definitions, thresholds, and requirements for the 
proposed subpart are outlined in sections IV.D.2 through IV.D.9 of this 
preamble.
3. Proposed Definition of the Source Category
    Caprolactam is a crystalline solid organic compound with a wide 
variety of uses, including brush bristles, textile stiffeners, film 
coatings, synthetic leather, plastics, plasticizers, paint vehicles, 
cross-linking for polyurethanes, and in the synthesis of lysine. 
Caprolactam is primarily used in the manufacture of synthetic fibers, 
especially Nylon 6.

[[Page 32899]]

    Glyoxal is a solid organic compound with a wide variety of uses, 
including as a crosslinking agent in various polymers for paper 
coatings, textile finishes, adhesives, leather tanning, cosmetics, and 
oil-drilling fluids; as a sulfur scavenger in natural gas sweetening 
processes; as a biocide in water treatment; to improve moisture 
resistance in wood treatment; and as a chemical intermediate in the 
production of pharmaceuticals, dyestuffs, glyoxylic acid, and other 
chemicals. It is also used as a less toxic substitute for formaldehyde 
in some applications (e.g., in wood adhesives and embalming fluids).
    Glyoxylic acid is a solid organic compound exclusively produced by 
the oxidation of glyoxal with nitric acid. It is used mainly in the 
synthesis of vanillin, allantoin, and several antibiotics like 
amoxicillin, ampicillin, and the fungicide azoxystrobin.
    We are proposing that the caprolactam, glyoxal, and glyoxylic acid 
production source category would include any facility that produces 
caprolactam, glyoxal, or glyoxylic acid. We are also proposing that the 
source category would exclude the production of glyoxal through the 
LaPorte process (i.e., the gas-phase catalytic oxidation of ethylene 
glycol with air in the presence of a silver or copper catalyst). The 
LaPorte process does not emit N2O and there are no methods 
for estimating CO2 in available literature.
4. Selection of Proposed Reporting Threshold
    The total process emissions from current production of caprolactam, 
glyoxal, and glyoxylic acid are estimated at 1.2 million 
mtCO2e. Most of the emissions are from the two known 
caprolactam production facilities. There are approximately two to four 
facilities that produce glyoxal and glyoxylic acid. Therefore, the 
known universe of facilities that produce caprolactam, glyoxal, and 
glyoxylic acid in the United States is four to six total 
facilities.\60\
---------------------------------------------------------------------------

    \60\ See Revised Technical Support Document For Caprolactam, 
Glyoxal, and Glyoxylic Acid Production: Supplemental Proposed Rule 
For The Greenhouse Gas Reporting Program available in the docket for 
this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    In developing the reporting threshold for caprolactam, glyoxal, and 
glyoxylic acid production, we considered both an ``all-in'' (no 
threshold) and emissions-based thresholds of 10,000 mtCO2e, 
25,000 mtCO2e, and 100,000 mtCO2e. Table 7 of 
this preamble illustrates the emissions and facilities that would be 
covered under these various thresholds.

               Table 7--Threshold Analysis for Caprolactam, Glyoxal, and Glyoxylic Acid Production
----------------------------------------------------------------------------------------------------------------
                                                         Emissions covered              Facilities covered
                                                 ---------------------------------------------------------------
            Threshold level (mtCO2e)                 mtCO2e/yr
                                                     (million)        Percent         Number          Percent
----------------------------------------------------------------------------------------------------------------
100,000.........................................               0               0               0               0
25,000..........................................             1.2            99.6               3              50
10,000..........................................             1.2            99.6               3              50
All-in (no threshold)...........................             1.2             100               6             100
----------------------------------------------------------------------------------------------------------------

    Table 7 of this preamble illustrates that there is a small 
difference in the total emissions that would be covered but a larger 
difference in the number of facilities that would be covered, depending 
on the threshold chosen. All thresholds except 100,000 
mtCO2e ensure that both of the known caprolactam facilities 
are covered by this subpart. However, using a threshold of 10,000 
mtCO2e or 25,000 mtCO2e would exclude three of 
the four facilities that potentially produce glyoxal and glyoxylic 
acid. Adding caprolactam, glyoxal, and glyoxylic acid production as an 
``all-in'' subpart (i.e., regardless of their emissions profile) is a 
conservative approach to gather information from as many facilities 
that produce caprolactam, glyoxal, and glyoxylic acid as possible, 
especially if production of glyoxal and glyoxylic acid increase in the 
near future. Defining this source category as an ``all-in'' subpart 
also accounts for the uncertainty in the data and assumptions used in 
the initial emissions analysis for glyoxal and glyoxylic acid. The 
CO2 emissions from glyoxal production (1,500 mt 
CO2e) were estimated based on nationwide production data of 
50 million pounds from 2011,\61\ relied on literature estimates to 
determine the yield of glyoxal, and assumed that all hydrocarbon 
feedstock that is not converted to glyoxal is converted to 
CO2. The N2O emissions from glyoxylic acid 
production were estimated as zero based on nationwide data from 
2015.\62\
---------------------------------------------------------------------------

    \61\ Compilation of data submitted under the Toxic Substances 
Control Act (TSCA) in 2011. Accessed April 2021. Available at 
https://chemview.epa.gov/chemview.
    \62\ Compilation of data submitted under TSCA in 2015. Accessed 
April 2021. Available at https://chemview.epa.gov/chemview.
---------------------------------------------------------------------------

    Collecting data from all caprolactam, glyoxal, and glyoxylic acid 
facilities would help the EPA better understand the current level of 
production of each chemical and how accurate the literature estimates 
are at the facility level. Further details on the estimated emissions 
from facilities that produce caprolactam, glyoxal, and glyoxylic acid 
are available in, Revised Technical Support Document For Caprolactam, 
Glyoxal, and Glyoxylic Acid Production: Supplemental Proposed Rule For 
The Greenhouse Gas Reporting Program, available in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
5. Selection of Proposed Calculation Methods
    The ammonia oxidation step of caprolactam production results in 
emissions of N2O, and the ammonium carbonate step results in 
insignificant emissions of CO2. Therefore, only 
N2O process emissions are estimated from caprolactam 
production.
    The liquid-phase oxidation of acetaldehyde with nitric acid to 
produce glyoxal emits both N2O and CO2, but 
available methods for estimating emissions address only the 
N2O. The LaPorte process for producing glyoxal generates 
CO2 emissions but there are no methods for estimating such 
emissions. Therefore, only N2O process emissions are 
estimated from glyoxal production.
    Glyoxylic acid is produced by the oxidation of glyoxal with nitric 
acid. A considerable amount of the glyoxal is overoxidized to oxalic 
acid, and N2O is created through this secondary reaction. 
Only N2O process emissions are estimated from glyoxylic acid 
production.

[[Page 32900]]

    Combustion emissions at facilities that produce caprolactam, 
glyoxal, and glyoxylic acid are expected to include CO2, 
CH4, and N2O.
    We reviewed two methods from the 2006 IPCC Guidelines \63\ for 
calculating N2O emissions from the production of 
caprolactam, glyoxal, and glyoxylic acid, as summarized in this section 
of the preamble. Additional detail on the calculation methods reviewed 
are available in the Revised Technical Support Document For 
Caprolactam, Glyoxal, and Glyoxylic Acid Production: Supplemental 
Proposed Rule For The Greenhouse Gas Reporting Program, available in 
the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    \63\ IPCC 2006. IPCC Guidelines for National Greenhouse Gas 
Inventories, Volume 3, Industrial Processes and Product Use. Chapter 
3, Chemical Industry Emissions. 2006. www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/3_Volume3/V3_3_Ch3_Chemical_Industry.pdf.
---------------------------------------------------------------------------

    Option 1 for calculating N2O emissions. Following the 
Tier 2 approach established by the IPCC, apply default N2O 
generation factors on a site-specific basis. This option requires raw 
material input to be known in addition to a standard N2O 
generation factor, which differs for each of the three chemicals. In 
addition, Tier 2 requires site-specific knowledge of the use of 
N2O control technologies. The volume or mass of each product 
would be measured with a flow meter or weigh scales. The process-
related N2O emissions are estimated by multiplying the 
generation factor by the production and the destruction efficiency of 
any N2O control technology.
    Option 2 for calculating N2O emissions. Follow the Tier 3 approach 
established by IPCC using periodic direct monitoring of N2O emissions 
to determine the relationship between production and the amount of 
N2O emissions, i.e., develop a site-specific emissions 
factor. The site-specific N2O emission factor would be 
determined from an annual measurement or a single annual stack test. 
The site-specific emissions factor developed from this test and 
production rate (activity level) are used to calculate N2O 
emissions. After the initial test, annual testing of N2O 
emissions would be required to estimate the N2O emission 
factor. The new factor would then be applied to production to estimate 
N2O emissions.
    Proposed Option for calculating N2O emissions. We are proposing 
Option 1 (IPCC Tier 2 approach) to quantify N2O process 
emissions from caprolactam, glyoxal, and glyoxylic acid production 
facilities. Option 1 is already being used in the Inventory for 
caprolactam production and the method is also directly applicable to 
glyoxal and glyoxylic acid production. Synergy would be gained from 
using the same methodology for both programs.
    For any stationary combustion units included at the facility, 
facilities would be required to follow the existing requirements in 40 
CFR part 98, subpart C to calculate emissions of CO2, 
CH4 and N2O from stationary combustion.
6. Selection of Proposed Monitoring, QA/QC, and Verification 
Requirements
    The proposed monitoring required to comply with the N2O 
calculation methodologies for reporters that produce caprolactam, 
glyoxal, and glyoxylic acid are to determine the monthly and annual 
production quantities of each chemical and to determine the 
N2O destruction efficiency of any N2O abatement 
technologies in use. The EPA considered two options for determination 
of production quantities:
    Option 1 for production quantities. Use direct measurement of 
production quantities for all three chemicals. This option is 
consistent with existing GHGRP subparts but could be burdensome to 
require a specific measurement method.
    Option 2 for production quantities. Use existing plant procedures 
used for accounting purposes to determine production quantities for all 
three chemicals. This option is also consistent with existing GHGRP 
subparts and would not impose additional burden to applicable 
facilities.
    Proposed option for production quantities. We are proposing to 
allow either direct measurement of production quantities or existing 
plant procedures to determine production quantities. This option 
requires one of the following from reporters: maintain documentation of 
the procedures used to ensure the accuracy of the measurements of all 
reported parameters and the estimated accuracy of the measurements made 
with these devices, or maintain documentation of how accounting 
procedures were used to determine production. Allowing reporters to use 
either method for determining production quantities provides 
flexibility to reporters and is consistent with existing part 98 
subparts.
    The EPA considered two options for determination of the 
N2O destruction efficiency:
    Option 1 for control device destruction efficiency. Estimate the 
destruction efficiency for each N2O abatement technology. 
This can be determined by using the N2O control device's 
manufacturer-specified destruction efficiency or estimating the 
destruction efficiency through process knowledge.
    Option 2 for control device destruction efficiency. Use a default 
N2O destruction efficiency according to the 2006 IPCC 
guidelines.\64\ The IPCC default is 80 percent for glyoxal and 
glyoxylic acid if the facility is known to have abatement and 0 percent 
if no abatement. The IPCC default is 0 percent for caprolactam.
---------------------------------------------------------------------------

    \64\ Id.
---------------------------------------------------------------------------

    Proposed option for control device destruction efficiency. We are 
proposing to require reporters to estimate the destruction efficiency 
for each N2O abatement technology because this option is 
more accurate than using a default destruction efficiency. The 
destruction efficiency can be determined by using the manufacturer's 
specific destruction efficiency or estimating the destruction 
efficiency through process knowledge. Documentation of how process 
knowledge was used to estimate the destruction efficiency is required 
if reporters choose that option. Examples of information that could 
constitute process knowledge include calculations based on material 
balances, process stoichiometry, or previous test results provided that 
the results are still relevant to the current vent stream conditions.
    For the caprolactam, glyoxal, and glyoxylic acid production 
subpart, we are proposing to require reporters to perform all 
applicable flow meter calibration and accuracy requirements and 
maintain documentation as specified in 40 CFR 98.3(i).
7. Selection of Proposed Procedures for Estimating Missing Data
    For caprolactam, glyoxal, and glyoxylic acid production, we are 
proposing that substitute data would be the best available estimate 
based on all available process data or data used for accounting 
purposes (such as sales records). For the control device destruction 
efficiency, assuming that the control device operation is generally 
consistent from year to year, we are proposing the substitute data 
value would be the most recent quality-assured value.
8. Selection of Proposed Data Reporting Requirements
    We are proposing that facilities report annual N2O 
emissions (in metric tons) from each production line. In addition, we 
are proposing that facilities submit the following data to understand 
the emissions data and verify the

[[Page 32901]]

reasonableness of the reported emissions: number of process lines; 
annual production capacity; annual production; number of operating 
hours in the calendar year for each process line; abatement technology 
used and installation dates (if applicable); abatement utilization 
factor; number of times in the reporting year that missing data 
procedures were followed to measure production quantities of 
caprolactam, glyoxal, or glyoxylic acid (months); and overall percent 
N2O reduction for each chemical.
    Capacity, production, and operating hours would be helpful in 
determining the potential for growth in the subpart. Under the proposed 
rule, the production rate can be determined through sales records or by 
direct measurement using flow meters or weigh scales.
    A list of abatement technologies would be helpful in assessing how 
widespread the use of abatement is in this subpart, cataloging any new 
technologies that are being used, and documenting the amount of time 
that the abatement technologies are being used.
9. Selection of Proposed Records That Must Be Retained
    We are proposing that facilities maintain records documenting the 
procedures used to ensure the accuracy of the measurements of all 
reported parameters, including but not limited to, calibration of 
weighing equipment, flow meters, and other measurement devices. The 
estimated accuracy of measurements made with these devices would also 
be required to be recorded, and the technical basis for these estimates 
would be required to be provided. We are also proposing that facilities 
maintain records documenting the estimate of production rate and 
abatement technology destruction efficiency through accounting 
procedures and process knowledge, respectively.
    The proposed rule would also require the retention of a record of 
the file generated by the verification software specified in 40 CFR 
98.5(b) including:
     Monthly production quantities of caprolactam from all 
process lines;
     Monthly production quantities of glyoxal from all process 
lines; and
     Monthly production quantities of glyoxylic acid from all 
process lines.
    Maintaining records of information used to determine reported GHG 
emissions is necessary to allow us to verify that GHG emissions 
monitoring and calculations were done correctly.

E. Subpart ZZ--Ceramics Production

1. Rationale for Inclusion in the GHGRP
    For the reasons described in section II.B and the 2022 Data Quality 
Improvements Proposal, consistent with its authority under the CAA, the 
EPA is proposing to add a new subpart, subpart ZZ of part 98 (Ceramics 
Production), for facilities engaged in the manufacturing of ceramics to 
quantify and report GHG emissions from their processes and from fuel 
combustion. Ceramics manufacturing facilities are identified in the 
IPCC 2006 Guidelines as a source of CO2 emissions based on 
the calcination process, which incorporates raw carbonates such as 
clay, shale, limestone, and dolomite, and as a source of 
CO2, CH4, and N2O emissions from 
combustion in kilns, dryers, and other sources.\65\ Although there are 
currently a large number of ceramics manufacturing facilities operating 
in the United States, emissions from these operations are not 
explicitly accounted for in the GHGRP. While it was originally 
anticipated that some of these ceramic production facilities would be 
required to report under subpart U of part 98 (Miscellaneous Uses of 
Carbonate), there are no such facilities currently reporting under this 
subpart, likely because they do not meet the applicability requirements 
of subpart U due to the use of carbonates contained in clay rather than 
pure carbonates. Currently, only 16 ceramics facilities report under 
part 98, and these facilities only report combustion emissions under 
subpart C (General Stationary Fuel Combustion Sources). As such, we 
have determined that emissions from ceramics manufacturing are likely 
not appropriately captured in the GHGRP.
---------------------------------------------------------------------------

    \65\ IPCC Guidelines for National Greenhouse Gas Inventories, 
Volume 3, Industrial Processes and Product Use, Mineral Industry 
Emissions. 2006. www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/3_Volume3/V3_2_Ch2_Mineral_Industry.pdf.
---------------------------------------------------------------------------

    For these reasons, we are proposing the addition of a new source 
category for ceramics manufacturing to better align with the guidance 
and approach of the IPCC 2006 Guidelines and to provide clear 
applicability requirements and emissions estimation methodologies for 
these types of facilities. The proposed requirements would improve the 
completeness of the data collected under the GHGRP, add to the EPA's 
understanding of the GHG emissions from these sources, and better 
inform future EPA policy under the CAA. Once collected, such data would 
also be available to and improve on the estimates provided in the 
Inventory, by incorporating the recommendations of the 2006 IPCC 
guidelines.
2. Public Comments Received in Request for Comment
    In section IV.B of the 2022 Data Quality Improvements Proposal, the 
EPA requested comment on the addition of ceramics manufacturing as a 
new subpart to part 98. The request for comment covered the following 
topics:
     Whether the EPA should add a source category related to 
ceramics manufacturing;
     Information related to the source category definition, 
including whether it should be included as a separate category or as 
part of an existing category such as subpart N (Glass Production);
     What calculation methodologies should be used for purposes 
of part 98 reporting, including what information is readily available 
to reporters to support calculation methodologies;
     What monitoring requirements should be in place and what 
methodologies are recommended for monitoring and QA/QC; and
     What reporting requirements should be in place.
    This section presents a broad overview of the comments received 
regarding the request for comment on ceramics production.
    We received one comment on the addition of a source category for 
ceramics manufacturing, stating that the commenter opposed a new source 
category for brick manufacturing and that the EPA has methods available 
to estimate GHG emissions from the brick industry without annual GHG 
reporting. The commenter suggested that the EPA consider a one-time 
information collection request for GHG emissions data or other 
collaboration with the brick industry as an alternative to mandatory 
reporting requirements. The EPA is proposing the addition of a new 
source category for ceramics manufacturing that would include a variety 
of ceramics production industries in addition to brick manufacturing. 
As discussed in the 2022 Data Quality Improvements Proposal, we are 
seeking data from these sources to improve the coverage of the GHGRP, 
provide more accurate emissions estimations, and better inform the 
development of GHG policies and programs under the CAA. This 
information would also further align the data collected under GHGRP 
with the 2006 IPCC Guidelines.
3. Proposed Definition of the Source Category
    Ceramics manufacturing is the process in which nonmetallic, 
inorganic materials, many of which are clay-

[[Page 32902]]

based, are used to produce ceramic products such as bricks and roof 
tiles, wall and floor tiles, table and ornamental ware (household 
ceramics), sanitary ware, refractory products, vitrified clay pipes, 
expanded clay products, inorganic bonded abrasives, and technical 
ceramics (e.g., aerospace, automotive, electronic, or biomedical 
applications). Most ceramic products are made from one or more 
different types of clay (e.g., shales, fire clay, ball clay). The 
general process of manufacturing ceramic products consists of raw 
material processing (grinding, calcining, and drying), forming, firing, 
and final processing (which may include grinding, polishing, surface 
coating, annealing, and/or chemical treatment). GHG emissions are 
produced during the calcination process in the kiln, dryer, or oven, 
and from any combustion source.
    We are proposing that the ceramics source category would apply to 
facilities that annually consume at least 2,000 tons of carbonates or 
20,000 tons of clay heated to a temperature sufficient to allow the 
calcination reaction to occur, and operate a ceramics manufacturing 
process unit. We propose to define a ceramics manufacturing process 
unit as a kiln, dryer, or oven used to calcine clay or other carbonate-
based materials for the production of a ceramics product. The proposed 
definition of ceramics manufacturers as facilities that use at least 
the minimum quantity of carbonates or clay (2,000 tons/20,000 tons) 
would be consistent with the Miscellaneous Uses of Carbonate source 
category (subpart U of part 98). The source category definition 
establishes a minimum production level as a means to exclude and thus 
reduce the reporting burden for small artisan-level ceramics 
manufacturing processes. An example of a facility that may fall under 
this scenario is a university with a small ceramics department onsite 
for students. The university may be required to report GHGs under 
subpart D (Electricity Generation) but would only be required to gather 
data and report GHGs under subpart ZZ if the small ceramics department 
consumed at least 2,000 tons of carbonates or 20,000 tons of clay, as 
ceramic process and combustion emissions from use of 2,000 tons of 
carbonate are roughly estimated to be 3,100 mtCO2e.
    Additional background information about GHG emissions from the 
ceramics manufacturing source category is available in the Revised 
Technical Support Document for Ceramics: Supplemental Proposed Rule For 
The Greenhouse Gas Reporting Program, available in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
4. Selection of Proposed Reporting Threshold
    Per the 2018 U.S. Census, approximately 815 corporations reported 
their primary NAICS code as one of the two NAICS codes associated with 
Clay Product and Refractory Manufacturing, representing an estimated 
850 facilities in the ceramics manufacturing industry.\66\ 
Additionally, there is an unknown number of corporations that operate a 
ceramics facility as a secondary or tertiary operation onsite.
---------------------------------------------------------------------------

    \66\ See the Revised Technical Support Document for Ceramics: 
Supplemental Proposed Rule For The Greenhouse Gas Reporting Program, 
available in the docket for this rulemaking (Docket Id. No. EPA-HQ-
OAR-2019-0424), for additional information.
---------------------------------------------------------------------------

    A large number of small artisan ceramic facilities comprise this 
industry--of the 815 corporations noted in the 2018 census, an 
estimated 700 corporations representing 86 percent have less than 100 
employees corporate-wide and likely low production rates and small GHG 
emissions (likely less than 25,000 mtCO2e).
    In developing the ceramics production source category, we 
considered including facilities that emit at least 10,000 
mtCO2e, 25,000 mtCO2e, or 100,000 
mtCO2e. Requiring all facilities to report (no threshold) 
was also considered. Table 8 of this preamble illustrates the estimated 
process and combustion CO2 emissions, and facilities that 
would be covered under each scenario.

                             Table 8--Threshold Analysis for Ceramics Manufacturing
----------------------------------------------------------------------------------------------------------------
                                                         Emissions covered              Facilities covered
          Threshold level (metric tons)          ---------------------------------------------------------------
                                                     mtCO2e/yr        Percent         Number          Percent
----------------------------------------------------------------------------------------------------------------
100,000.........................................               0               0               0               0
25,000..........................................       2,770,000              60              34             4.0
10,000..........................................       2,770,000              60              34             4.0
All-in (no threshold)...........................       4,630,000             100             850             100
----------------------------------------------------------------------------------------------------------------

    As the quantity of emissions covered were estimated to be the same 
for the 10,000 mtCO2e and 25,000 mtCO2e 
thresholds, between these two options it is reasonable to adopt a 
facility definition that would include facilities estimated to emit 
25,000 mtCO2e or more. A threshold of 25,000 
mtCO2e is also preferable at this time to the ``all-in'' 
option because it would avoid burden on small facilities with few 
employees and lower overall emissions.
    The proposed definition of ceramics manufacturers as facilities 
that use at least the minimum quantity of carbonates or clay (2,000 
tons/20,000 tons) and the 25,000 mtCO2e threshold are both 
expected to ensure that small ceramics manufacturers are excluded. It 
is estimated that over 30 facilities would meet the proposed definition 
of a ceramics manufacturer and the proposed threshold of 25,000 
mtCO2e for reporting. The total combined process and 
combustion emissions from this source category are estimated at 2.77 
million mtCO2e.
    For a full discussion of this analysis, please refer to the Revised 
Technical Support Document for Ceramics: Supplemental Proposed Rule For 
The Greenhouse Gas Reporting Program, available in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
5. Selection of Proposed Calculation Methods
    CO2 emissions result from the calcination of carbonates 
in the raw material (particularly clay, shale, limestone, dolomite, and 
witherite) and the use of limestone or other additives as a flux. 
Carbonates are heated to high temperatures in a ceramics process unit 
producing oxides and CO2. Additionally, CO2, 
CH4, and N2O emissions are produced during 
combustion in the ceramics manufacturing process unit and from other 
combustion sources on site.
    We reviewed existing methodologies for estimating ceramics 
manufacturing

[[Page 32903]]

process related GHG emissions including those of the 2006 IPCC 
Guidelines for National Greenhouse Inventories,\67\ the European Union, 
Canada's Greenhouse Quantification Requirements, the EPA's GHGRP, and 
Australia's National Greenhouse and Energy Reporting Amendment. 
Additional detail on the calculation methods reviewed are available in 
the Revised Technical Support Document for Ceramics: Supplemental 
Proposed Rule For The Greenhouse Gas Reporting Program, available in 
the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424). 
From the review of existing programs, three basic calculation 
methodologies were identified.
---------------------------------------------------------------------------

    \67\ IPCC Guidelines for National Greenhouse Gas Inventories, 
Volume 3, Industrial Processes and Product Use, Mineral Industry 
Emissions. 2006. https://www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/3_Volume3/V3_2_Ch2_Mineral_Industry.pdf.
---------------------------------------------------------------------------

    Option 1. This approach directly measures emissions using a CEMS. 
The CEMS would measure CO2 concentration and total exhaust 
gas flow rate for the combined process and combustion source emissions. 
CO2 mass emissions would be calculated from these measured 
values using equation C-6 and, if necessary, equation C-7 in 40 CFR 
98.33(a)(4). The combined process and combustion CO2 
emissions would be calculated according to the Tier 4 Calculation 
Methodology specified in 40 CFR 98.33(a)(4).
    Option 2. The carbon mass balance method, which is based on the 
IPCC Tier 3 approach, requires that the carbon content and the mass of 
carbonaceous materials input to the process be determined. The facility 
would measure the consumption of specific process inputs and the 
amounts of these materials consumed by end-use/product type. Carbon 
contents of materials would be determined through the analysis of 
samples of the material or from information provided by the material 
suppliers. Also, the quantities of these materials consumed and 
produced during production would be measured and recorded. 
CO2 emissions would be estimated by multiplying the carbon 
content of each raw material by the corresponding mass, by a carbonate 
emission factor, and by the decimal fraction of calcination achieved 
for that raw material.
    Option 3. The IPCC Tier 1 approach is a basic mass balance method 
that assumes limestone and dolomite are the only carbonates used as 
input, and that 85 percent of carbonates consumed are limestone and 15 
percent of carbonates consumed are dolomite. This carbonate assumption 
reflects pure carbonates, and not carbonate rock or materials such as 
clay that contain carbonate-based minerals. For clay or other 
carbonate-based raw materials, this approach assumes a default purity 
of 10 percent for clay content. Generally, this method is less accurate 
as it involves multiplying raw material usage by a default carbonate-
based mineral content. CO2 emissions would be estimated by 
multiplying the quantity of clay used by the assumed limestone and 
dolomite percentages and their respective carbonate emission factors.
    For option 2 and option 3, facilities would be required to follow 
40 CFR part 98, subpart C (General Stationary Fuel Combustion Sources) 
to estimate combustion GHG emissions of CO2, CH4, 
and N2O from ceramics process units.
    Proposed option. We are proposing two different methods for 
quantifying GHG emissions from ceramics manufacturing, depending on 
current emissions monitoring at the facility. If a qualified CEMS is in 
place, the CEMS must be used. Otherwise, the facility can elect to 
either install a CEMS or elect to use the carbon mass balance method.
    CEMS method (Option 1). Facilities with a CEMS that meet the 
requirements in 40 CFR part 98, subpart C would be required to use CEMS 
to estimate the combined process and combustion CO2 
emissions. Facilities would be required to use subpart C to estimate 
emissions of CO2, CH4, and N2O from 
stationary combustion.
    Carbon balance method (Option 2). For facilities that do not have 
CEMS that meet the requirements of 40 CFR part 98, subpart C, the 
proposed monitoring method for process emissions is the Option 2 carbon 
mass balance method. For any stationary combustion units included at 
the facility, facilities would be required to follow 40 CFR part 98, 
subpart C to estimate emissions of CO2, CH4, and 
N2O from stationary combustion.
    Use of facility specific information under Option 2 is consistent 
with IPCC Tier 3 methods and is the preferred method for estimating 
emissions for other GHGRP sectors. Any additional burden associated 
with material measurement required for the carbon balance would be 
small in relation to the increased accuracy expected from using this 
site-specific information. Of the two non-CEMS options, we are 
proposing Option 2 as it has the lowest uncertainty.
6. Selection of Proposed Monitoring, QA/QC, and Verification 
Requirements
    We are proposing two separate monitoring methods: direct 
measurement and a mass balance emission calculation.
    Proposed option for direct measurement using CEMS. Industrial 
source categories for which the process emissions and/or combustion GHG 
emissions are contained within a stack or vent can take direct 
measurement of the GHG concentration in the stack gas and the flow rate 
of the stack gas using a CEMS. In the case of ceramics manufacturing, 
process and combustion GHG emissions from ceramics process units are 
typically emitted from the same stack. Under the proposed rule, if 
facilities use an existing CEMS to meet the monitoring requirements, 
they would be required to use CEMS to estimate CO2 
emissions. Where the CEMS capture all combustion- and process-related 
CO2 emissions, facilities would be required to follow the 
requirements of 40 CFR part 98, subpart C to estimate all 
CO2 emissions from the industrial source.
    A CEMS continuously withdraws and analyzes a sample of the stack 
gas and continuously measures the GHG concentration and flow rate of 
the total exhaust stack gas. The emissions are calculated from the 
CO2 concentration and the flow rate of the stack gas. The 
proposed CEMS method requires both a continuous CO2 
concentration monitor and a continuous volumetric flow monitor. To 
qualify as a CEMS, the monitors would be required to be installed, 
operated, and calibrated according to subpart C (General Stationary 
Fuel Combustion Sources) of part 98 (40 CFR 98.33(a)(4)), which is 
consistent with CEMS requirements in other GHGRP subparts.
    Proposed option for mass balance calculation. The proposed carbon 
mass balance method requires monitoring of mass quantities of 
carbonate-based raw material (e.g., clay) fed to the process, 
establishing the mass fraction of carbonate-based minerals in the raw 
material, and an emission factor based on the type of carbonate 
consumed.
    The mass quantities of carbonate-based raw materials consumed by 
each ceramics process unit can be determined using direct weight 
measurement of plant instruments or techniques used for accounting 
purposes, such as calibrated scales, weigh hoppers, or weigh belt 
feeders. The direct weight measurement can then be compared to records 
of raw material purchases for the year.
    For the carbon content of the materials used to calculate process 
CO2 emissions, we are proposing that the owner or operator 
determine the carbon mass fraction either by using information provided 
by the raw

[[Page 32904]]

material supplier, by collecting and sending representative samples of 
each carbonate-based material consumed to an offsite laboratory for a 
chemical analysis of the carbonate content (weight fraction), or by 
choosing to use the default value of 1.0. The use of 1.0 for the mass 
fraction assumes that the carbonate-based raw material comprises 100 
percent of one carbonate-based mineral. Suitable chemical analysis 
methods include using an x-ray fluorescence standard method. The 
proposed rule would require the carbon content be analyzed at least 
annually using standard ASTM methods, including their QA/QC procedures.
    The carbonate emission factors provided in proposed Table ZZ-1 to 
subpart ZZ of part 98 are based on stoichiometric ratios and represent 
the weighted average of the emission factors for each particular 
carbonate. These factors were pulled from Table N-1 to subpart N of 
part 98, and from Table 2.1 of the 2006 IPCC Guidelines.\68\ Emission 
factors provided by the carbonate vendor for other minerals not listed 
in Table ZZ-1 may also be used.
---------------------------------------------------------------------------

    \68\ Id.
---------------------------------------------------------------------------

    For the ceramics manufacturing source category, we are proposing 
for QA/QC requirements that reporters calibrate all meters or monitors 
and maintain documentation of this calibration. These meters or 
monitors should be calibrated prior to the first reporting year, using 
a suitable method published by a consensus standards organization 
(e.g., ASTM, American Society of Mechanical Engineers (ASME), American 
Petroleum Institute (API), American Gas Association (AGA), etc.), or as 
specified by the meter/monitor manufacturer. These meters or monitors 
would be required to be recalibrated either annually or at the minimum 
frequency specified by the manufacturer.
    In addition, any flow rate monitors used for direct measurement 
would be required to comply with QA procedures for daily calibration 
drift checks and quarterly or annual accuracy assessments, such as 
those provided in Appendix F to part 60 or similar QA procedures. We 
are proposing these requirements to ensure the quality of the reported 
GHG emissions and to be consistent with the current requirements for 
CEMS measurements within subparts A (General Provisions) and C of the 
GHGRP.
    For measurements of carbonate content, reporters would assess 
representativeness of the carbonate content received from suppliers 
with laboratory analysis.
7. Selection of Proposed Procedures for Estimating Missing Data
    The proposed rule would require the use of substitute data whenever 
a quality-assured value of a parameter is used to calculate emission is 
unavailable, or ``missing.'' For example, if the CEMS malfunctions 
during unit operation, the substitute data value would be the average 
of the quality-assured values of the parameter immediately before and 
immediately after the missing data period. For missing data on the 
amounts of carbonate-based raw materials consumed, we are proposing 
reporters must use the best available estimate based on all available 
process data or data used for accounting purposes, such as purchase 
records. For missing data on the mass fractions of carbonate-based 
minerals in the carbonate-based raw materials, reporters would assume 
that the mass fraction of each carbonate-based mineral is 1.0. The use 
of 1.0 for the mass fraction assumes that the carbonate-based raw 
material comprises 100 percent of one carbonate-based mineral. The 
likelihood for missing process input or output data is low, as business 
closely track their purchase of production inputs. Missing data 
procedures would be applicable for CEMS measurements, mass measurements 
of raw material, and carbon content measurements.
8. Selection of Proposed Data Reporting Requirements
    We propose that each ceramics manufacturing facility report the 
annual CO2 process emissions from each ceramics 
manufacturing process, as well as any stationary fuel combustion 
emissions. In addition, we propose that additional information that 
forms the basis of the emissions estimates also be reported so that we 
can understand and verify the reported emissions.
    For ceramic manufacturers, the additional information would 
include: the total number of ceramics process units at the facility and 
the total number of units operating; annual production of each ceramics 
product for each process unit; the annual production capacity of each 
ceramics process unit; and the annual quantity of carbonate-based raw 
material charged for all ceramics process units combined.
    For ceramic manufacturers with non-CEMS units, the proposed rules 
would also require reporting of the following information: the method 
used for the determination for each carbon-based mineral in each raw 
material; applicable test results used to verify the carbonate-based 
mineral mass fraction for each carbonate-based raw material charged to 
a ceramics process unit, including the date of test and test methods 
used; and the number of times in the reporting year that missing data 
procedures were used.
9. Selection of Proposed Records That Must Be Retained
    Maintaining records of information used to determine reported GHG 
emissions is necessary to allow the EPA to verify that GHG emissions 
monitoring and calculations were done correctly. The proposed rule 
would require facilities subject to subpart ZZ to maintain monthly 
records of the ceramics production rate for each ceramics process unit, 
and the monthly amount of each carbonate-based raw material charged to 
each ceramics process unit.
    Additionally, if facilities use the carbon balance procedure, the 
proposed rule would require facilities to maintain monthly records of 
the carbonate-based mineral mass fraction for each mineral in each 
carbonate-based raw material. Facilities would also be required to 
maintain (1) records of the supplier-provided mineral mass fractions 
for all raw materials consumed annually, (2) results of all analyses 
used to verify the mineral mass fraction for each raw material 
(including the mass fraction of each sample, the date of test; test 
methods and method variations; and equipment calibration data, and 
identifying information for the laboratory conducting the test); and 
(3) annual operating hours for each unit. If facilities use the CEMS 
procedure, they would be required to maintain the CEMS measurement 
records.
    Under the proposed rule, the procedures for ensuring accuracy of 
measurement methods, including calibration, must be recorded. The 
proposed rules would require records of how measurements are made 
including measurements of quantities of materials used or produced and 
the carbon content of minerals in raw materials.
    The proposed rule would require the retention of a record of the 
file generated by the verification software specified in 40 CFR 98.5(b) 
including: annual average decimal mass fraction of each carbonate-based 
mineral per carbonate-based raw material for each ceramics process unit 
(percent by weight expressed as a decimal fraction); annual mass of 
each carbonate-based raw material charged to each ceramics process unit 
(tons); and the decimal fraction of calcination achieved for each 
carbonate-based raw material for each ceramics process unit (percent by 
weight expressed as a decimal fraction).

[[Page 32905]]

V. Schedule for the Proposed Amendments

    In the 2022 Data Quality Improvements Proposal, the EPA intended 
the proposed amendments to take effect starting January 1, 2023. We are 
now planning to consider the comments on the 2022 Data Quality 
Improvements Proposal and this supplemental proposal, which would delay 
the effective date of any final rule. If amendments from either the 
2022 Data Quality Improvements Proposal or this supplemental proposal 
are finalized, we plan to respond to comments and publish any final 
rule(s) regarding both notices during 2024. We are proposing that the 
final amendments would become effective on January 1, 2025. Reporters 
would implement the changes beginning with reports prepared for RY2025 
and submitted March 31, 2026, with one exception explained in this 
section below for existing reporters.
    We are proposing this revised schedule because it would provide 
additional time for reporters to prepare to comply and simplify 
implementation. There are several source categories for which we have 
included proposed revisions in both the 2022 Data Quality Improvements 
Proposal and in this supplemental notification. We anticipate that it 
would be less burdensome for reporters in these source categories to 
have the proposed rule amendments go into effect in the same year 
instead of having the amendments go into effect separately across two 
different reporting years. This proposed revised schedule would also 
provide time for affected stakeholders to adapt to new monitoring 
requirements and purchase and install any necessary monitoring 
equipment. We intend to finalize this proposed rule early-2024 and have 
determined that it would be feasible for reporters to implement the 
proposed changes for RY2025.
    For existing reporters, the proposed amendments largely update or 
clarify calculations, clarify provisions, or amend reporting 
requirements, but do not result in changes that require monitoring, 
sampling, or calibration of equipment. A number of proposed changes 
would amend the reporting requirements for individual sectors to 
require information that we anticipate would be readily available to 
facilities. For example, we are proposing revisions that would require 
facilities to report information regarding annual production capacity 
and operation hours (e.g., subpart F (Aluminum Production)), capacity 
of emission units (e.g., subpart Y (Petroleum Refineries)) or to 
provide information regarding process inputs (e.g., subpart N (Glass 
Production)) or process types (e.g., subpart P (Hydrogen Production)). 
In these cases, we anticipate that facilities can easily identify and 
obtain capacity and process information, and we anticipate that 
facilities would have any additional inputs for calculations available 
in company records or could easily calculate the required input from 
existing process knowledge and engineering estimates, or from available 
company records. In other cases, we are proposing to require reporting 
of information that facilities have currently maintained as records for 
the purposes of part 98 (e.g., we are proposing that facilities submit 
CBP entry forms previously retained as records under subparts OO 
(Suppliers of Industrial Greenhouse Gases) and QQ (Importers and 
Exporters of Fluorinated GHGs Contained in Pre-charged Equipment and 
Closed-Cell Foams)), or information that is already maintained in 
keeping with existing facility data permits (e.g., hours of operation), 
or may be estimated using emission factors or engineering judgment. 
Therefore, for these types of changes, reporters would not need a 
significant amount of time in advance of the 2025 reporting year to 
collect the additional data. Existing reporters that are direct 
emitters that would be newly required to report energy consumption 
under proposed subpart B (Energy Consumption) would be able to 
implement the requirements for RY2025 because facilities would not be 
required to immediately install special equipment or conduct routine 
monitoring, but rather would be able to rely on billing statements for 
purchased energy products that would be readily available to 
facilities. For existing reporters subject to subpart HH (Municipal 
Solid Waste Landfills), we anticipate that facilities would be able to 
implement the proposed revisions to the monitoring and calculation 
methodologies for RY2025 because the proposed revisions apply to 
facilities that are already subject to landfills NSPS (40 CFR part 60, 
subpart WWW or XXX), state plans implementing landfills EG (40 CFR part 
60, subparts Cc or Cf), or landfills Federal plans (40 CFR part 62, 
subpart GGG or OOO). Facilities are already required to conduct surface 
measurement monitoring per the requirements of the NSPS, EG, or Federal 
plans, and would only be required to use the existing measurement data 
to provide a count of the number of exceedances to adjust the reported 
methane emissions to account for these exceedances. The proposed 
requirements also require facilities that are not subject to the 
landfill NSPS (40 CFR part 60, subpart WWW or XXX), EG (40 CFR part 60, 
subparts Cc or Cf), or Federal plans (40 CFR part 62, subpart GGG or 
OOO) to either use the proposed lower gas collection efficiency value 
or elect to monitor their landfill as specified in this proposal and 
use the currently existing gas collection efficiency values. Therefore, 
although we are proposing to add surface methane concentration 
monitoring methods at 40 CFR 98.344, this monitoring is optional to 
facilities that are not subject to the NSPS, EG, or Federal plans. As 
such, we anticipate that landfills would be able to incorporate these 
changes for their RY2025 reports with minimal changes to their existing 
monitoring and operations.
    Some facilities that are not currently subject to the GHGRP would 
be brought into the program by proposed revisions that change what 
facilities must report under the rule. For example, we are proposing to 
revise subpart P (Hydrogen Production) to include non-merchant 
(captive) hydrogen production plants, as outlined in section III.G of 
this preamble, and proposing to collect data in several new source 
categories, including subparts WW (Coke Calciners), XX (Calcium Carbide 
Production), YY (Caprolactam, Glyoxal, and Glyoxylic Acid Production), 
and ZZ (Ceramics Production), as outlined in section IV of this 
preamble. The facilities affected by these proposed amendments would 
need to start implementing requirements, including any required 
monitoring and recordkeeping, on January 1, 2025, and prepare reports 
for RY2025 that must be submitted by March 31, 2026. Because we plan to 
promulgate any final rule(s) by early-2024, new reporters under these 
subparts should have sufficient time to implement the amendments, 
including installation or calibration of any necessary equipment, and 
be ready to collect data for reporting starting on January 1, 2025. We 
anticipate that new reporters that have not previously reported under 
part 98 would have over six months to comply with the monitoring 
methods for new emission sources in subparts P, WW, XX, YY, and ZZ, 
which would allow time for facilities to install necessary monitoring 
equipment and set up internal recordkeeping and reporting systems.\69\
---------------------------------------------------------------------------

    \69\ Existing reporters with coke calciners located at petroleum 
refineries that currently report under subpart Y would continue to 
report under subpart Y for RY2024, and would begin reporting under 
subpart WW with their RY2025 reports. The monitoring, calculation, 
reporting, and recordkeeping requirements for coke calciners under 
subpart WW do not substantially differ from the existing 
requirements for these units under subpart Y.

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

[[Page 32906]]

    Some facilities that have not previously reported to the GHGRP may 
also become subject to the rule due to the proposed revisions to GWPs 
in Table A-1 to subpart A of part 98.\70\ Reporters that become subject 
to a new subpart of part 98 due to the proposed revisions to Table A-1 
to subpart A, per the existing requirements at 40 CFR 98.3(k), would 
not be required to submit an annual GHG report until the following 
reporting year. Therefore, these new reporters would also implement 
changes and begin monitoring and recordkeeping on January 1, 2025.
---------------------------------------------------------------------------

    \70\ Part 98 requires direct emitters and suppliers of GHGs to 
use the GWP values in Table A-1 to subpart A to calculate emissions 
(or supply) of GHGs in CO2e. These values are used to 
determine whether the facility meets a CO2e-based 
threshold and is required to report under part 98, as well as to 
calculate total facility emissions for the annual report. A change 
to the GWP for a GHG will change the calculated emissions (in 
CO2e) of that gas. Therefore, the proposed amendments 
could affect the number of facilities required to report under part 
98.
---------------------------------------------------------------------------

    Per the existing regulations at 40 CFR 98.3(k), there is one 
exception to this proposed schedule. Specifically, in keeping with 40 
CFR 98.3(k), the GWP amendments to Table A-1 to subpart A would apply 
to reports submitted by current reporters that are submitted in 
calendar year 2025 and subsequent years, i.e., starting with reports 
submitted for RY2024 on March 31, 2025. The revisions to GWPs do not 
affect the data collection, monitoring, or calculation methodologies 
used by these existing reporters. The EPA's e-GGRT generally 
automatically applies GWPs to a facility's emissions as reported in 
metric tons. Therefore, existing facilities would not have to conduct 
any additional activities for the reports submitted for RY2024.
    Finally, although we previously stated in the 2022 Data Quality 
Improvements Proposal that facilities that would report under proposed 
subpart VV (Geologic Sequestration of Carbon Dioxide With Enhanced Oil 
Recovery Using ISO 27916) would implement the requirements beginning in 
RY2023, we are now proposing that these reporters would begin to 
implement the proposed changes and begin reporting under subpart VV 
starting in RY2025. As we stated in the 2022 Data Quality Improvements 
Proposal, these facilities already report under part 98 and are likely 
to follow the calculation requirements and data gathering prescribed 
under CSA/ANSI ISO 27916:2019 to quantify storage for the Internal 
Revenue Code (IRC) section 45Q tax credit.\71\ The facilities that are 
likely to be subject to subpart VV are thus not anticipated to be new 
reporters and would not perform any additional calculation, monitoring, 
or quality assurance procedures under the proposed requirements; 
therefore, the information submitted to the GHGRP would be obtained and 
provided from readily available data and could be implemented beginning 
January 1, 2025. We request comment on the proposed schedule for 
existing and new reporters and the feasibility of implementing these 
requirements for the proposed schedule.
---------------------------------------------------------------------------

    \71\ See 26 CFR 1.45Q-0 through 26 CFR 1.45Q-5.
---------------------------------------------------------------------------

VI. Proposed Confidentiality Determinations for Certain Data Elements

A. Overview and Background

    Part 98 requires reporting of numerous data elements to 
characterize, quantify, and verify GHG emissions and related 
information. Following proposal of part 98 (74 FR 16448, April 10, 
2009), the EPA received comments addressing the issue of whether 
certain data could be entitled to confidential treatment. In response 
to these comments, the EPA stated in the preamble to the 2009 Final 
Rule (74 FR 56387, October 30, 2009) that through a notice and comment 
process, we would establish those data elements that are entitled to 
confidential treatment. This proposal is one of a series of rules 
dealing with confidentiality determinations for data reported under 
part 98. For more information on previous confidentiality 
determinations for part 98 data elements, see the following documents:
     75 FR 39094, July 7, 2010. Describes the data categories 
and category-based determinations the EPA developed for the part 98 
data elements.
     76 FR 30782, May 26, 2011; hereafter referred to as the 
``2011 Final CBI Rule.'' Assigned data elements to data categories and 
published the final CBI determinations for the data elements in 34 part 
98 subparts, except for those data elements that were assigned to the 
``Inputs to Emission Equations'' data category.
     77 FR 48072, August 13, 2012. Finalized confidentiality 
determinations for data elements reported under nine subparts, except 
for those data elements that are ``inputs to emission equations.'' Also 
finalized confidentiality determinations for new data elements added to 
subparts II (Industrial Wastewater Treatment) and TT (Industrial Waste 
Landfills) in the November 29, 2011 Technical Corrections document (76 
FR 73886).
     78 FR 68162; November 13, 2013. Finalized confidentiality 
determinations for new data elements added to subpart I (Electronics 
Manufacturing).
     78 FR 69337, November 29, 2013. Finalized determinations 
for new and revised data elements in 15 subparts, except for those data 
elements assigned to the ``Inputs to Emission Equations'' data 
category.
     79 FR 63750, October 24, 2014. Revised recordkeeping and 
reporting requirements for ``inputs to emission equations'' for 23 
subparts and finalized confidentiality determinations for new data 
elements in 11 subparts.
     79 FR 70352, November 25, 2014. Finalized confidentiality 
determinations for new and substantially revised data elements in 
subpart W (Petroleum and Natural Gas Systems).
     79 FR 73750, December 11, 2014. Finalized confidentiality 
determinations for certain reporting requirements in subpart L 
(Fluorinated GHG Production).
     80 FR 64262, October 22, 2015. Finalized confidentiality 
determinations for new data elements in subpart W.
     81 FR 86490, November 30, 2016. Finalized confidentiality 
determinations for new or substantially revised data elements in 
subpart W.
     81 FR 89188, December 9, 2016. Finalized confidentiality 
determinations for new or substantially revised data elements in 18 
subparts and for certain existing data elements in four subparts.
    In the 2022 Data Quality Improvements Proposal, the EPA proposed 
confidentiality determinations for certain data elements in 26 
subparts, including data elements newly added or substantially revised 
in the proposed amendments and existing data elements where the EPA had 
previously not established a determination or was proposing to revise 
or clarify a determination based on new information. In this 
supplemental proposal, the EPA is proposing additional amendments to 
part 98 that would complement, expand on, or refine the amendments 
proposed in the 2022 Data Quality Improvements Proposal or that would 
further enhance the quality of part 98 and implementation of the GHGRP. 
To support the proposed amendments described in sections III and IV of 
this preamble, we are also proposing confidentiality determinations or 
``emission data'' designations for the following:

[[Page 32907]]

     New or substantially revised reporting requirements (i.e., 
the proposed change requires additional or different data to be 
reported); and
     Existing reporting requirements for which the EPA did not 
previously finalize a confidentiality determination or ``emission 
data'' designation.
    Further, we propose to designate certain new or substantially 
revised data elements as ``inputs to emission equations.'' For each 
element that we propose would fall in this category, we further propose 
whether the data element would be directly reported to the EPA or 
whether it would be entered into IVT (see section VI.C of this preamble 
for a discussion of ``inputs to emission equations'').
    Table 9 of this preamble provides the number of affected data 
elements and the affected subparts for each of these proposed actions. 
The majority of the determinations would apply at the same time as the 
proposed schedule described in section V of this preamble. In the cases 
where the EPA is proposing a determination for an existing data element 
where one was not previously made, the proposed determinations would be 
effective on January 1, 2025, and would apply to annual reports 
submitted for RY2025, as well as all prior years that the data were 
collected.

  Table 9--Summary of Proposed Actions Related to Data Confidentiality
------------------------------------------------------------------------
  Proposed actions related to data   Number of data
          confidentiality             elements \a\         Subparts
------------------------------------------------------------------------
New or substantially revised                    153  A, B, C, F, G, N,
 reporting requirements for which                     P, Y, HH, OO, PP,
 the EPA is proposing a                               QQ, WW, XX, YY,
 confidentiality determination or                     ZZ.
 ``emission data'' designation.
Existing reporting requirements for               1  A.
 which the EPA is proposing a
 confidentiality determination or
 ``emission data'' designation
 because the EPA did not previously
 make a confidentiality
 determination or ``emission data''
 designation.
New or substantially revised                     32  P, HH, WW, XX, YY,
 reporting requirements that the                      ZZ.
 EPA is proposing be designated as
 ``inputs to emission equations''
 and for which the EPA is proposing
 reporting determinations.
------------------------------------------------------------------------
\a\ These data elements are individually listed in the memoranda: (1)
  Proposed Confidentiality Determinations and Emission Data Designations
  for Data Elements in Proposed Supplemental Revisions to the Greenhouse
  Gas Reporting Rule and (2) Proposed Reporting Determinations for Data
  Elements Assigned to the Inputs to Emission Equations Data Category in
  Proposed Supplemental Revisions to the Greenhouse Gas Reporting Rule,
  available in the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-
  2019-0424).

B. Proposed Confidentiality Determinations and Emissions Data 
Designations

1. Proposed Approach
    The EPA is proposing to assess the data elements in this 
supplemental proposed rule in the same manner as the 2022 Data Quality 
Improvements Proposal. In that proposal, the EPA described a revised 
approach to assessing data in response to Food Marketing Institute v. 
Argus Leader Media, 139 S. Ct. 2356 (2019) (hereafter referred to as 
Argus Leader).\72\
---------------------------------------------------------------------------

    \72\ Available in the docket for this rulemaking (Docket Id. No. 
EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    First, we proposed that the Argus Leader decision does not affect 
our approach to designating data elements as ``inputs to emission 
equations'' or our previous approach for designating new and revised 
reporting requirements as ``emission data.'' We proposed to continue 
identifying new and revised reporting elements that qualify as 
``emission data'' (i.e., data necessary to determine the identity, 
amount, frequency, or concentration of the emission emitted by the 
reporting facilities) by evaluating the data for assignment to one of 
the four data categories designated by the 2011 Final CBI Rule to meet 
the CAA definition of ``emission data'' in 40 CFR 2.301(a)(2)(i) \73\ 
(hereafter referred to as ``emission data categories''). Refer to 
section II.B of the July 7, 2010 proposal for descriptions of each of 
these data categories and the EPA's rationale for designating each data 
category as ``emission data.'' For data elements designated as ``inputs 
to emission equations,'' the EPA maintained the two subcategories, data 
elements entered into e-GGRT's Inputs Verification Tool (IVT) and those 
directly reported to the EPA. Refer to section VI.C of the preamble of 
the 2022 Data Quality Improvements Proposal for further discussion of 
``inputs to emission equations.''
---------------------------------------------------------------------------

    \73\ See section I.C of the July 7, 2010 proposal (75 FR 39100) 
for a discussion of the definition of ``emission data.'' As 
discussed therein, the relevant paragraphs (to the GHGRP) of the CAA 
definition of ``emission data'' include 40 CFR 2.301(a)(2)(i)(A) and 
(C), as follows: (A) ``Information necessary to determine the 
identity, amount, frequency, concentration, or other characteristics 
(to the extent related to air quality) of any emission which has 
been emitted by the source (or of any pollutant resulting from any 
emission by the source), or any combination of the foregoing;'' and 
(C) ``A general description of the location and/or nature of the 
source to the extent necessary to identify the source and to 
distinguish it from other sources (including, to the extent 
necessary for such purposes, a description of the device, 
installation, or operation constituting the source).''
---------------------------------------------------------------------------

    Then in the 2022 Data Quality Improvements Proposal, for new or 
revised data elements that the EPA did not propose to designate as 
``emission data'' or ``inputs to emission equations,'' the EPA proposed 
a revised approach for assessing data confidentiality. We proposed to 
assess each individual reporting element according to the new Argus 
Leader standard. So, we evaluated each data element individually to 
determine whether the information is customarily and actually treated 
as private by the reporter and proposed a confidentiality determination 
based on that evaluation.
2. Proposed Confidentiality Determinations and ``Emission Data'' 
Designations
    In this section, we discuss the proposed confidentiality 
determinations and ``emission data'' designations for 153 new or 
substantially revised data elements. We also discuss one existing data 
element (i.e., not proposed to be substantially revised) for which for 
no determination has been previously established.
a. Proposed Confidentiality Determinations and ``Emission Data'' 
Designations for New or Substantially Revised Data Reporting Elements
    For the 153 new and substantially revised data elements, the EPA is 
proposing ``emission data'' designations for 38 data elements and 
confidentiality determinations for 115 data elements. The EPA is 
proposing to designate 38 new or substantially revised data

[[Page 32908]]

elements as ``emission data'' by assigning the data elements to four 
emission data categories (established in the 2011 Final CBI Rule as 
discussed in section VI.B.1 of this preamble), as follows:
     16 data elements that are proposed to be reported under 
subparts C, P, WW, XX, YY, and ZZ are proposed to be assigned to the 
``Emissions'' emission data category;
     10 data elements that are proposed to be reported under 
subparts P, HH, WW, XX, and YY are proposed to be assigned to the 
``Facility and Unit Identifier Information'' emission data category;
     Four data elements that are proposed to be reported under 
subparts P, HH, WW, and XX are proposed to be assigned to the 
``Calculation Methodology and Methodological Tier'' emission data 
category; and
     Eight data elements that are proposed to be reported under 
subparts N, XX, YY, and ZZ are proposed to be assigned to the ``Data 
Elements Reported for Periods of Missing Data that are Not Inputs to 
Emission Equations'' emission category.
    Refer to Table 1 in the memorandum, Proposed Confidentiality 
Determinations and Emission Data Designations for Data Elements in 
Proposed Supplemental Revisions to the Greenhouse Gas Reporting Rule, 
available in the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-
2019-0424), for a list of these 38 data elements proposed to be 
designated as ``emission data,'' the proposed emission data category 
assignment for each data element, and the EPA's rationale for each 
proposed ``emission data'' category assignment.
    The remaining 115 new and substantially revised data elements not 
proposed to be designated as ``emission data,'' or ``inputs to emission 
equations,'' are proposed to be reported under subparts A, B, C, F, G, 
N, P, Y, HH, OO, PP, QQ, WW, XX, YY, and ZZ. This proposal assesses 
each individual reporting element according to the Argus Leader 
criteria as discussed in section VI.B.1 of this preamble. Refer to 
Table 2 in the memorandum, Proposed Confidentiality Determinations and 
Emission Data Designations for Data Elements in Proposed Revisions to 
the Greenhouse Gas Reporting Rule, to see a list of these 115 specific 
data elements, the proposed confidentiality determination for each data 
element, and the EPA's rationale for each proposed confidentiality 
determination. These determinations show the data elements that the EPA 
would hold as confidential and those that the EPA would publish.
b. Proposed Confidentiality Determinations for Existing Part 98 Data 
Elements for Which No Determination Has Been Previously Established
    We are proposing to make a confidentiality determination for one 
existing data element in subpart A for which no confidentiality 
determination has been previously established under part 98. Review of 
previous rules revealed one instance where a confidentiality 
determination had been made for a previous version of a data element, 
but not for the current version of that data element. This data element 
(40 CFR 98.3(c)(5)(i)) is the total quantity of GHG aggregated for all 
GHG from all applicable supply categories in Table A-5 (in 
mtCO2e). When part 98 was first promulgated, 40 CFR 
98.3(c)(5)(i) referred explicitly to individual supplier categories 
rather than to Table A-5. Consequently, when a confidentiality 
determination for 40 CFR 98.3(c)(5)(i) was finalized in the May 26, 
2011 final rule (76 FR 30782), the determination referred explicitly to 
the supply categories that existed when the confidentiality 
determination was proposed in July 2010, which included subparts LL 
through PP. On December 1, 2010, the EPA finalized subpart QQ and added 
it to Table A-5, but the EPA never updated the confidentiality 
determination for 40 CFR 98.3(c)(5)(i) to clearly include importers and 
exporters reporting under subpart QQ. To update the determination for 
this data element, the EPA is now proposing to extend the existing 
determination to include suppliers under QQ. In particular, the EPA is 
proposing that this data element would not be eligible for confidential 
treatment except in cases where a single product is supplied, and the 
amount of that single product supplied has been determined to be 
eligible for confidential treatment. Refer to Table 3 in the 
memorandum, Proposed Confidentiality Determinations and Emission Data 
Designations for Data Elements in Proposed Supplemental Revisions to 
the Greenhouse Gas Reporting Rule, available in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424), for details of the 
data element receiving a determination, the proposed confidentiality 
determination, and the Agency's rationale for the proposed 
determinations.

C. Proposed Reporting Determinations for Inputs to Emission Equations

    In this section, we discuss data elements that EPA proposes to 
assign to the ``Inputs to Emission Equations'' data category. This data 
category includes data elements that are the inputs to the emission 
equations used by sources that directly emit GHGs to calculate their 
annual GHG emissions.\74\ As discussed in section VI.B.1 of the 2022 
Data Quality Improvements Proposal, the EPA determined that the Argus 
Leader decision does not affect our approach for handling of data 
elements assigned to the ``Inputs to Emission Equations'' data 
category.
---------------------------------------------------------------------------

    \74\ For facilities that directly emit GHGs, part 98 includes 
equations that facilities use to calculate emission values. The 
``Inputs to Emission Equations'' data category includes the data 
elements that facilities would be required to enter in the equations 
to calculate the facility emissions values, e.g., monthly 
consumption or production data or measured values from required 
monitoring, such as carbon content. See 75 FR 39094, July 7, 2010 
for a full description of the ``Inputs to Emission Equations'' data 
category.
---------------------------------------------------------------------------

    The EPA organizes data assigned to the ``Inputs to Emission 
Equations'' data category into two subcategories. The first subcategory 
includes ``inputs to emission equations'' that must be directly 
reported to the EPA. This is done in circumstances where the EPA has 
determined that the data elements do not meet the criteria necessary 
for them to be entered into the IVT system. These ``inputs to emission 
equations,'' once received by the EPA, are not held as confidential. 
The second subcategory includes ``inputs to emission equations'' that 
are entered into IVT. These ``inputs to emission equations'' are 
entered into IVT to satisfy the EPA's verification requirements. These 
data must be maintained as verification software records by the 
submitter, but the data are not included in the annual report that is 
submitted to the EPA. This is done in circumstances where the EPA has 
determined that the data elements meet the criteria necessary for them 
to be entered into the IVT system. Refer to the memorandum, Proposed 
Reporting Determinations for Data Elements Assigned to the Inputs to 
Emission Equations Data Category in Proposed Supplemental Revisions to 
the Greenhouse Gas Reporting Rule, available in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424), for a discussion of 
the criteria that we established in 2011 for evaluating whether data 
assigned to the ``Inputs to Emission Equations'' data category should 
be entered into the IVT system.
    We are proposing to assign 32 new or substantially revised data 
elements in subparts HH, WW, XX, YY, and ZZ to the ``Inputs to Emission 
Equations'' data category. We evaluated each of the 32 proposed new or 
substantially revised

[[Page 32909]]

data elements assigned to the ``Inputs to Emission Equations'' data 
category and determined that 13 of these 32 data elements do not meet 
the criteria necessary for them to be entered into the IVT system; 
therefore, we propose that these 13 data elements be directly reported 
to the EPA. As ``inputs to emission equations'' are emissions data, 
these 13 data elements would not be eligible for confidential treatment 
once directly reported to the EPA, and they would be published once 
received by the EPA. Refer to Table 1 in the memorandum, Proposed 
Reporting Determinations for Data Elements Assigned to the Inputs to 
Emission Equations Data Category in Proposed Supplemental Revisions to 
the Greenhouse Gas Reporting Rule, available in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424), for a list of these 
13 data elements proposed to be designated as ``inputs to emission 
equations'' that would be directly reported to the EPA and the EPA's 
rationale for the proposed reporting determinations.
    For the remaining 19 proposed new data elements in subparts WW, XX, 
YY, and ZZ of the 32 data elements assigned to the ``Inputs to Emission 
Equations'' data category and evaluated based on the criteria discussed 
earlier in this section VI.C, we determined that all 19 data elements 
meet the criteria necessary for them to be entered into the IVT system. 
These 19 data elements include information such as quantities of 
materials produced and quantities of raw materials consumed. As 
documented in previous rules (refer to the list of rules specified in 
section VI.A of this preamble), the EPA has generally determined that 
these types of data meet the criteria necessary for them to be entered 
into the IVT system (except in cases where the information is already 
publicly available). Therefore, these 19 data elements in subparts WW, 
XX, YY, and ZZ are not proposed to be directly reported to the EPA 
(i.e., the EPA is not proposing to include these data elements as 
reporting requirements), but instead these 19 data elements would be 
entered into the IVT and maintained as verification software records by 
the submitter. A list of these data elements is included in Table 2 of 
the memorandum, Proposed Reporting Determinations for Data Elements 
Assigned to the Inputs to Emission Equations Data Category in Proposed 
Supplemental Revisions to the Greenhouse Gas Reporting Rule, available 
in the docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-
0424). Refer to section IV of this preamble for discussion of all 
proposed recordkeeping requirements of subparts WW, XX, YY, and ZZ.

D. Request for Comments on Proposed Category Assignments, 
Confidentiality Determinations, or Reporting Determinations

    By proposing confidentiality determinations prior to data reporting 
through this proposal and rulemaking process, we are providing 
potential reporters an opportunity to submit comments, particularly 
comments identifying data elements proposed by the Agency to be ``not 
CBI'' that reporters consider to be customarily and actually treated as 
private. Likewise, we provide potential reporters an opportunity to 
submit comments on whether there are disclosure concerns for data 
elements proposed to be categorized as ``inputs to emission equations'' 
that we propose would be directly reported to the EPA via annual 
reports and subsequently released by the EPA. This opportunity to 
submit comments is intended to provide reporters with the opportunity 
that is afforded to reporters when the EPA considers claims for 
confidential treatment of information in case-by-case confidentiality 
determinations under 40 CFR part 2. In addition, the comment period 
provides an opportunity to respond to the EPA's proposed determinations 
with more information for the Agency to consider prior to finalization. 
We will evaluate the comments on our proposed determinations, including 
claims of confidentiality and information substantiating such claims, 
before finalizing the confidentiality determinations. Please note that 
this will be reporters' only opportunity to substantiate a 
confidentiality claim for data elements included in this proposed rule 
where a confidentiality determination or reporting determination is 
being proposed. Upon finalizing the confidentiality determinations and 
reporting determinations of the data elements identified in this 
proposed rule, the EPA will release or withhold these data in 
accordance with 40 CFR 2.301(d), which contains special provisions 
governing the treatment of part 98 data for which confidentiality 
determinations have been made through rulemaking pursuant to CAA 
sections 114 and 307(d).
    If members of the public have reason to believe any data elements 
in this proposed rule that are proposed to be treated as confidential 
are not customarily and actually treated as private by reporters, 
please provide comment explaining why the Agency should not provide an 
assurance of confidential treatment for data. Likewise, if members of 
the public have reason to disagree with the EPA's proposal that 
``inputs to emission equations'' qualify to be entered into IVT and 
retained as verification software records instead of being directly 
reported to the EPA, please provide comment explaining why the ``inputs 
to emission equations'' do not qualify to be entered into IVT, should 
be directly reported to the EPA, and subsequently released by the EPA.
    When submitting comments regarding the confidentiality 
determinations or reporting determinations we are proposing in this 
action, please identify each individual proposed new, revised, or 
existing data element you consider to be confidential or do not 
consider to be ``emission data'' in your comments. If the data element 
has been designated as ``emission data,'' please explain why you do not 
believe the information should be considered ``emission data'' as 
defined in 40 CFR 2.301(a)(2)(i). If the data has not been designated 
as ``emission data'' and is proposed to be not entitled to confidential 
treatment, please explain specifically how the data element is 
commercial or financial information that is both customarily and 
actually treated as private. Particularly describe the measures 
currently taken to keep the data confidential and how that information 
has been customarily treated by your company and/or business sector in 
the past. This explanation is based on the requirements for 
confidential treatment set forth in Argus Leader. If the data element 
has been designated as an ``input to an emission equation'' (i.e., not 
entitled to confidential treatment) and proposed to be directly 
reported to the EPA via annual reports and subsequently released by the 
EPA, please explain specifically why there are disclosure concerns. 
Likewise, if the data element has been designated as an ``input to an 
emission equation'' that we propose would not be directly reported to 
the EPA, but instead entered into IVT and retained as verification 
software records, please explain specifically why there are not 
disclosure concerns.
    Please also discuss how this data element may be different from or 
similar to data that are already publicly available, including data 
already collected and published annually by the GHGRP, as applicable. 
Please submit information identifying any publicly available sources of 
information containing the specific data elements in question. Data 
that are already available through other sources would likely be

[[Page 32910]]

found not to qualify for confidential treatment. In your comments, 
please identify the manner and location in which each specific data 
element you identify is publicly available, including a citation. If 
the data are physically published, such as in a book, industry trade 
publication, or Federal agency publication, provide the title, volume 
number (if applicable), author(s), publisher, publication date, and 
International Standard Book Number (ISBN) or other identifier. For data 
published on a website, provide the address of the website, the date 
you last visited the website and identify the website publisher and 
content author. Please avoid conclusory and unsubstantiated statements, 
or general assertions regarding the confidential nature of the 
information.
    Finally, we are not proposing new confidentiality determinations 
and reporting determinations for data reporting elements proposed to be 
unchanged or minimally revised because the final confidentiality 
determinations and reporting determinations that the EPA made in 
previous rules for these unchanged or minimally revised data elements 
are unaffected by this proposed amendment and will continue to apply. 
The minimally revised data elements are those where we are proposing 
revisions that would not require additional or different data to be 
reported. For example, under subpart P (Hydrogen Production), we are 
proposing to revise the data element at 40 CFR 98.166(b)(3)(i) ``annual 
quantity of hydrogen produced (metric tons)'' to read ``annual quantity 
of hydrogen produced by reforming, gasification, oxidation, reaction, 
or other transformation of feedstock (metric tons)'' to clarify the 
reporting requirement by harmonizing the data element description with 
the definition of the source category in 40 CFR 98.160(b). This 
proposed change would not affect the data collected, and therefore we 
are not proposing a new or revised confidentiality determination. 
However, we are soliciting comment on any cases where a minor revision 
would affect the previous confidentiality determination or reporting 
determination. In your comments, please identify the specific data 
element, including name and citation, and explain why the minor 
revision would affect the previous confidentiality determination or 
reporting determination.

VII. Impacts of the Proposed Amendments

    The EPA is proposing amendments to part 98 where we have identified 
revisions that would complement, expand on, or refine the amendments 
proposed in the 2022 Data Quality Improvements Proposal as well as 
additional amendments that we have determined would further enhance the 
quality of part 98. The proposed revisions include revisions to the 
global warming potentials in Table A-1 to subpart A of part 98, 
revisions to establish requirements for new source categories and 
expanding reporting for new emission sources for specific sectors, 
updates to existing emissions estimation methodologies, and revisions 
to collect data that would improve the EPA's understanding of the 
sector-specific processes or other factors that influence GHG emission 
rates, verification of collected data, or to complement or inform other 
EPA programs under the CAA. We anticipate that the proposed revisions 
would result in an overall increase in burden to reporters.
    The primary costs associated with the rule include initial labor 
and non-labor costs for reporters that are newly subject to part 98 to 
come into compliance with the rule. The proposed revisions to Table A-1 
to subpart A to part 98 are estimated to result in a change to the 
number of reporters under subparts V, W, DD, HH, II, OO, and TT (i.e., 
where a change to GWPs would affect reporters that are currently at or 
close to the 25,000 mtCO2e threshold, or that would affect a 
reporter's ability to off-ramp from part 98 reporting as determined 
under 40 CFR 98.2(i)). Additional revisions to the applicability of 
subparts P, Y, and the proposed addition of new source categories for 
energy consumption; coke calcining; calcium carbide; caprolactam, 
glyoxal, and glyoxylic acid production; and ceramics manufacturing are 
also anticipated to change the number of reporters reporting under 
current subparts of part 98 or that are newly subject to reporting 
under part 98. We also estimated costs where we are proposing to add or 
revise monitoring and calculation methods that would require additional 
data to be collected or estimated, and where reporters would be 
required to submit additional data that we anticipate could be obtained 
from existing company records or are readily available or estimated 
from other data currently gathered under part 98. Where we included 
proposed revisions for a source category in both the 2022 Data Quality 
Improvements Proposal and in this supplemental notification, the costs 
for this supplemental proposal were adjusted to account for revisions 
from the 2022 Data Quality Improvements Proposal.
    As discussed in section V of this preamble, we are proposing to 
implement these changes for existing and new reporters on January 1, 
2025, to apply to RY2025 reports.\75\ Costs have been estimated over 
the three years following the year of implementation. The incremental 
implementation labor costs for all subparts include $11,748,619 in 
RY2025, and $7,644,140 in each subsequent year (RY2026 and RY2027). The 
incremental implementation labor costs over the next three years 
(RY2025 through RY2027) total $27,076,898. There is an additional 
incremental burden of $3,223,041 for capital and operation and 
maintenance (O&M) costs in RY2025 and $3,225,282 in each subsequent 
year (RY2026 and RY2027), which reflects changes to applicability and 
monitoring for subparts P, W, V, Y, DD, HH, II, OO, and TT and new 
subparts B, WW, XX, YY, and ZZ. The incremental non-labor costs for 
RY2025 through RY2027 total $9,673,605.
---------------------------------------------------------------------------

    \75\ As discussed in section V of this preamble, for existing 
reporters, per the current regulations at 40 CFR 98.3(k), the 
proposed amendments to the GWPs in Table A-1 to subpart A would 
apply to reports submitted for RY2024 on March 31, 2025. However, 
there are no costs associated with implementing GWPs for RY2024 
reports because the proposed revisions would not affect the data 
collection, monitoring, or calculation methodologies used by 
existing reporters.
---------------------------------------------------------------------------

    The incremental burden for the proposed supplemental revisions is 
summarized by subpart for initial and subsequent years in Table 10 of 
this preamble. Note that subparts I, RR, UU, and VV include proposed 
revisions that are clarifications that would not result in any changes 
to burden (beyond those previously estimated in the 2022 Data Quality 
Improvements Proposal) and are not included in Table 10.

[[Page 32911]]

                                 Table 10--Annual Incremental Burden by Subpart
                                                     [$2021]
----------------------------------------------------------------------------------------------------------------
                                                                            Labor costs
                                                     Number of   --------------------------------   Capital and
                     Subpart                         affected      Initial year     Subsequent          O&M
                                                    facilities        RY2025      year RY2026-27
----------------------------------------------------------------------------------------------------------------
A--General Provisions \a\.......................           7,840         $64,133         $64,133              $-
B--Energy Consumption \a\.......................           7,840       8,771,243       4,700,877         489,050
C--General Stationary Fuel Combustion Sources...             346           9,906           9,906  ..............
F--Aluminum Production..........................               7              57              57  ..............
G--Ammonia Manufacturing........................              29             119             119  ..............
N--Glass Production.............................             100           1,227           1,227  ..............
P--Hydrogen Production \b\......................             118           7,179           7,179           4,481
V--Nitric Acid Production c d...................               1         (2,680)         (2,680)        (11,085)
W--Petroleum and Natural Gas Systems \e\........             188       2,620,418       2,620,418       2,717,864
Y--Petroleum Refineries b f.....................               6         (6,881)         (6,881)         (3,930)
AA--Pulp and Paper Manufacturing................               1             104             104  ..............
DD--Electrical Transmission \c\.................               2           6,200           6,200           3,119
HH--Municipal Solid Waste Landfills.............           1,126         130,188         127,330             374
II--Industrial Wastewater Treatment \c\.........               2           5,288           4,713           3,077
OO--Suppliers of Industrial Greenhouse Gases....             105           6,680           6,680              62
PP--Suppliers of Carbon Dioxide.................              11             135             135  ..............
QQ--Importers and Exporters of Fluorinated                    33             384             384  ..............
 Greenhouse Gases Contained in Pre-Charged
 Equipment or Closed-Cell Foams.................
TT--Industrial Waste Landfills \c\..............               1           4,853           3,934              62
WW--Coke Calciners \b\..........................              15          37,847          34,525          19,649
XX--Calcium Carbide \b\ Production..............               1           2,849           2,627              62
YY--Caprolactam, Glyoxal, and Glyoxylic Acid                   6          12,285          11,089             374
 Production \b\.................................
ZZ--Ceramics Production \b\.....................              34          77,083          72,062           2,121
                                                 ---------------------------------------------------------------
    Total.......................................  ..............      11,748,619       7,664,140       3,225,282
----------------------------------------------------------------------------------------------------------------
\a\ Applies to existing direct emitters under subpart B and new reporters anticipated under subparts W, DD, HH,
  II, OO, TT, WW, XX, YY, and ZZ.
\b\ Applies to reporters that may currently report under existing subparts of part 98 and that are newly subject
  to reporting under part 98.
\c\ Applies to reporters estimated to be affected due to revisions to Table A-1 to subpart A only.
\d\ Reflects changes to the number of reporters able to off-ramp from reporting under the part 98 source
  category.
\e\ For Subpart W, the revisions to Table A-1 included in this supplemental proposal and the revisions included
  in the 2022 Data Quality Improvements Proposal would increase the number of facilities subject to the
  requirements of the GHGRP. Some facilities would become subject to the requirements of the GHGRP due to either
  of these proposed changes. The EPA anticipates issuing a separate proposed rulemaking to implement certain
  provisions of the Methane Emissions and Waste Reduction Incentive Program that would propose further revisions
  to the requirements of Subpart W and which could also change the number of facilities subject to this
  subpart.\76\ The estimate included here for Subpart W in this supplemental proposal conservatively includes
  all facilities that would become subject to the GHGRP due to the proposed changes to Table A-1 included in
  this supplemental proposal compared to the existing requirements of the GHGRP and does not consider revisions
  proposed under the 2022 Data Quality Improvement Proposal.
\f\ Reflects changes to the number of reporters with coke calciners reporting under subpart Y that would be
  required to report under proposed subpart WW.

    Additional information regarding the costs impacts of the proposed 
amendments may be found in the memorandum, Assessment of Burden Impacts 
for Proposed Supplemental Notice of Revisions for the Greenhouse Gas 
Reporting Rule, available in the docket for this rulemaking (Docket Id. 
No. EPA-HQ-OAR-2019-0424).
---------------------------------------------------------------------------

    \76\ See the entry for RIN 060-AV83 in the Fall 2022 Regulatory 
Agenda at: https://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202210&RIN=2060-AV83.
---------------------------------------------------------------------------

VIII. Statutory and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive 
Order 13563: Improving Regulation and Regulatory Review

    This action is a significant regulatory action that was submitted 
to OMB for review. Any changes made in response to reviewer 
recommendations have been documented in the docket for this rulemaking 
(Docket Id. No. EPA-HQ-OAR-2019-0424).

B. Paperwork Reduction Act (PRA)

    The information collection requirements in this supplemental 
proposal have been submitted for approval to OMB under the PRA. The 
Information Collection Request (ICR) document that the EPA prepared for 
this supplemental proposal has been assigned OMB No. 2060-NEW (EPA ICR 
number 2773.01). You can find a copy of the ICR in the docket for this 
rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424), and it is briefly 
summarized here.
    The EPA has estimated that the supplemental proposal would result 
in an increase in burden. The burden associated with the proposed rule 
is primarily due to revisions to applicability, including revisions to 
the global warming potentials in Table A-1 to subpart A of part 98 that 
would change the number of reporters currently at or near the 25,000 
mtCO2e threshold; revisions to establish requirements for 
new source categories for energy consumption, coke calcining, calcium 
carbide, caprolactam, glyoxal, and glyoxylic acid production, and 
ceramics manufacturing; and revisions to expand reporting to include 
new emission sources for specific sectors, such as the addition of 
captive (non-merchant) hydrogen production facilities. The proposed 
revisions would affect approximately 253 new reporters across 13 source 
categories, including the hydrogen production, oil and gas, petroleum 
refineries, electrical transmission and distribution, industrial

[[Page 32912]]

wastewater, municipal solid waste landfill, fluorinated GHG supplier, 
and industrial landfill source categories. Additionally, there is 
burden associated with the proposed revisions to existing monitoring or 
emissions estimation methodologies, such as the additional time 
required to conduct engineering calculations or incorporate additional 
data (e.g., under subpart HH, we are proposing that reporters adjust 
emissions by including count and surface measurement methane 
concentration data gathered under other regulatory standards). Finally, 
there is burden associated with proposed revisions to collect 
additional facility production or input data that would improve the 
EPA's understanding of the sector-specific processes or other factors 
that influence GHG emission rates, verification of collected data, or 
to complement or inform other EPA programs under the CAA.
    The estimated annual average burden is 114,678 hours and 
$12,250,168 over the 3 years covered by this information collection, 
including $3,224,535 in non-labor costs. The labor burden costs include 
$11,748,619 from revisions implemented in the first year (RY2025), and 
$7,664,140 per year from revisions implemented in each subsequent year 
(RY2026 and RY2027). The incremental labor burden over the next three 
years (RY2025 through RY2027) totals 344,034 hours, $27,076,898 in 
labor costs, and $9,673,605 in capital and O&M costs. Further 
information on the EPA's assessment on the impact on burden can be 
found in the memorandum, Assessment of Burden Impacts for Proposed 
Revisions for the Greenhouse Gas Reporting Rule, available in the 
docket for this rulemaking (Docket Id. No. EPA-HQ-OAR-2019-0424).
    Respondents/affected entities: Owners and operators of facilities 
that must report their GHG emissions and other data to the EPA to 
comply with 40 CFR part 98.
    Respondent's obligation to respond: The respondent's obligation to 
respond is mandatory and the requirements in this rule are under the 
authority provided in CAA section 114.
    Estimated number of respondents: 7,990 (affected by proposed 
amendments).
    Frequency of response: Initially, annually.
    Total estimated burden: 114,678 hours (annual average per year). 
Burden is defined at 5 CFR 1320.3(b).
    Total estimated cost: $12,250,168 (annual average), includes 
$3,224,535 annualized capital or operation & maintenance costs.
    An Agency may not conduct or sponsor, and a person is not required 
to respond to, a collection of information unless it displays a 
currently valid OMB control number. The OMB control numbers for the 
EPA's regulations in 40 CFR are listed in 40 CFR part 9.
    Submit your comments on the Agency's need for this information, the 
accuracy of the provided burden estimates and any suggested methods for 
minimizing respondent burden to the EPA using the docket identified at 
the beginning of this rule. The EPA will respond to any ICR-related 
comments in the final rule. You may also send your ICR-related comments 
to OMB's Office of Information and Regulatory Affairs using the 
interface at www.reginfo.gov/public/do/PRAMain. Find this particular 
information collection by selecting ``Currently under Review--Open for 
Public Comments'' or by using the search function. OMB must receive 
comments no later than July 21, 2023.

C. Regulatory Flexibility Act (RFA)

    I certify that this supplemental proposal would not have a 
significant economic impact on a substantial number of small entities 
under the RFA. The small entities subject to the requirements of this 
action are small businesses across all sectors encompassed by the rule, 
small governmental jurisdictions, and small non-profits. In the 
development of 40 CFR part 98, the EPA determined that some small 
entities are affected because their production processes emit GHGs that 
must be reported, because they have stationary combustion units on site 
that emit GHGs that must be reported, or because they have fuel 
supplier operations for which supply quantities and GHG data must be 
reported. Small Governments and small non-profits are generally 
affected because they have regulated landfills or stationary combustion 
units on site, or because they own a local distribution company (LDC).
    In the promulgation of the 2009 rule, the EPA took several steps to 
reduce the impact on small entities. For example, the EPA determined 
appropriate thresholds that reduced the number of small entities 
reporting (e.g., the 25,000 mtCO2e threshold used to 
determine applicability under 40 CFR 98.2(a)(2)). In addition, the EPA 
conducted meetings with industry associations to discuss regulatory 
options and the corresponding burden on industry, such as recordkeeping 
and reporting. This supplemental proposal includes amendments that 
would improve the existing emissions estimation methodologies; 
implement requirements to collect additional data to understand new 
source categories or emissions sources; and improve the EPA's 
understanding of the sector-specific processes or other factors that 
influence GHG emission rates and improve verification of collected 
data; and more broadly inform climate programs and policies. For 
existing reporters, these changes are improvements or clarifications of 
requirements that do not require new monitoring and would not 
significantly increase reporter burden, or are changes that require 
data that is readily available and may be obtained from company records 
or estimated from existing inputs or data elements already collected 
under part 98. Further, the proposed revisions in this supplemental 
notification would not revise the 25,000 mtCO2e threshold or 
other subpart thresholds, therefore, we do not expect a significant 
number of small entities would be newly impacted under this 
supplemental proposal.
    Although the EPA continues to maintain thresholds that reduce the 
number of small entities reporting, we evaluated the impacts of the 
proposed revisions where we identified small entities could potentially 
be affected and considered whether additional measures to minimize 
impacts were needed. The EPA conducted a small entity analysis that 
assessed the costs and impacts to small entities in three areas, 
including: (1) amendments that revise the number or types of facilities 
required to report (i.e., updates of the GHGRP's applicability to 
certain sources), (2) changes to refine existing monitoring or 
calculation methodologies, and (3) revisions to reporting and 
recordkeeping requirements for data provided to the program. The 
analysis provides the subparts affected, the number of small entities 
affected, and the estimated impact to these entities based on the total 
annualized reporting costs of the proposed rule. Details of this 
analysis are presented in the memorandum, Assessment of Burden Impacts 
for Proposed Supplemental Revisions for the Greenhouse Gas Reporting 
Rule, available in the docket for this rulemaking (Docket Id. No. EPA-
HQ-OAR-2019-0424). Based on the results of this analysis, we concluded 
that this proposed action will have no significant regulatory burden 
for any directly regulated small entities and thus that this proposed 
action would not have a significant economic impact on a substantial 
number of small entities. The EPA continues to conduct significant 
outreach on the GHGRP and

[[Page 32913]]

maintains an ``open door'' policy for stakeholders to help inform the 
EPA's understanding of key issues for the industries. We continue to be 
interested in the potential impacts of the proposed rule amendments on 
small entities and welcome comments on issues related to such impacts.

D. Unfunded Mandates Reform Act (UMRA)

    This supplemental proposal does not contain an unfunded mandate of 
$100 million or more as described in UMRA, 2 U.S.C. 1531-1538, and does 
not significantly or uniquely affect small Governments.

E. Executive Order 13132: Federalism

    This supplemental proposal 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 supplemental proposal has tribal implications. However, it 
will neither impose substantial direct compliance costs on federally 
recognized Tribal Governments, nor preempt tribal law. The supplemental 
proposal would only have tribal implications where the tribal entity 
owns a facility that directly emits GHGs above threshold levels; 
therefore, relatively few (six) tribal entities would be affected. This 
regulation is not anticipated to affect facilities or suppliers of 
additional sectors owned by Tribal Governments.
    In evaluating the potential implications for tribal entities, we 
first assessed whether tribes would be affected by any proposed 
revisions that expanded the universe of facilities that would report 
GHG data to the EPA. The proposed rule amendments would implement 
requirements to collect additional data to understand new source 
categories or new emission sources for specific sectors; improve the 
existing emissions estimation methodologies; and improve the EPA's 
understanding of the sector-specific processes or other factors that 
influence GHG emission rates and improve verification of collected 
data. Of the 133 facilities that we anticipate would be newly required 
to report under the proposed revisions, we do not anticipate that there 
are any tribally owned facilities. As discussed in section VII of this 
preamble, we expect the proposed revisions to Table A-1 to part 98 to 
result in a change to the number of facilities required to report under 
subparts W (Petroleum and Natural Gas Systems), V (Nitric Acid 
Production), DD (Electrical Transmission and Distribution Equipment 
Use), HH (MSW Landfills), II (Industrial Wastewater Treatment), OO 
(Suppliers of Industrial GHGs), and TT (Industrial Waste Landfills). 
However, we did not identify any potential sources in these source 
categories that are owned by tribal entities not already reporting to 
the GHGRP. Similarly, although we are proposing amendments that would 
require that some facilities not currently subject to the GHGRP begin 
reporting and implementing requirements under the program for select 
new source categories, as discussed in section IV of this preamble, we 
have not identified, and do not anticipate, any such affected 
facilities in the proposed source categories that are owned by Tribal 
Governments.
    As a second step to evaluate potential tribal implications, we 
evaluated whether there were any tribally owned facilities that are 
currently reporting under the GHGRP that would be affected by the 
proposed revisions. Tribally owned facilities currently subject to part 
98 would only be subject to proposed changes that do not significantly 
change the existing requirements or result in substantial new 
activities because they do not require new equipment, sampling, or 
monitoring. Rather, tribally owned facilities would only be subject to 
new requirements where reporters would provide data that is readily 
available from company records. As such, the proposed revisions would 
not substantially increase reporter burden, impose significant direct 
compliance costs for tribal facilities, or preempt tribal law. 
Specifically, we identified ten facilities currently reporting to part 
98 that are owned by six tribal parent companies. For these six parent 
companies, we identified facilities in the stationary fuel combustion 
(subpart C), petroleum and natural gas (subpart W), and MSW landfill 
(subpart HH) source categories that may be affected by the proposed 
revisions. These facilities would be affected by the proposed revisions 
to subparts C and HH and the proposed addition of reporting 
requirements under subpart B (Energy Consumption). For these six parent 
companies, we reviewed publicly available sales and revenue data to 
determine whether the parent company was a small entity and to assess 
whether the costs of the proposed rule would be significant. Based on 
our review, we located sales and revenue data for three of the six 
parent companies (currently reporting under subparts C, W, and HH) and 
were able to confirm that the costs of the proposed revisions, 
including reporting of energy consumption data under proposed subpart 
B, would reflect less than one half of one percent of company revenue 
for these sources. The remaining three parent companies include 
facilities that report under subparts C and HH, and that would be 
required to report under new subpart B. Under the proposed rule, the 
costs for facilities currently reporting under subparts C or HH would 
be anticipated to increase by less than $100 per year per subpart. For 
subpart C, this would include costs related to revisions to report 
whether the facility has an electricity generating unit and the 
fraction of reported emissions attributable to electricity generation 
under subparts, which we do not anticipate would apply to tribal 
facilities. For subpart HH, this includes time to report additional 
information for landfills with gas collection systems and destruction 
devices, as well as additional time to adjust estimated methane 
emissions based on methane surface monitoring measurements or to use a 
default lower gas collection efficiency value. Under proposed subpart 
B, facilities would be anticipated to incur costs of up to $1,189 in 
the first year (for planning and implementation of a Metered Energy 
Monitoring Plan and associated reporting and recordkeeping) and $670 in 
subsequent years (for update of the Plan and associated reporting and 
recordkeeping). Based on our review of similar tribally owned 
facilities and small entity analysis (discussed in VIII.C of this 
preamble), we do not anticipate the proposed revisions to subparts B, 
C, or HH would impose substantial direct compliance costs on the 
remaining tribally owned entities.
    Further, although few facilities subject to part 98 are likely to 
be owned by Tribal Governments, the EPA previously sought opportunities 
to provide information to Tribal Governments and representatives during 
the development of the proposed and final rules for part 98 subparts 
that were promulgated on October 30, 2009 (74 FR 52620), July 12, 2010 
(75 FR 39736), November 30, 2010 (75 FR 74458), and December 1, 2010 
(75 FR 74774 and 75 FR 75076). Consistent with the 2011 EPA Policy on 
Consultation and Coordination with Indian Tribes,\77\ the

[[Page 32914]]

EPA previously consulted with tribal officials early in the process of 
developing part 98 regulations to permit them to have meaningful and 
timely input into its development and to provide input on the key 
regulatory requirements established for these facilities. A summary of 
these consultations is provided in section VIII.F of the preamble to 
the final rule published on October 30, 2009 (74 FR 52620), section V.F 
of the preamble to the final rule published on July 12, 2010 (75 FR 
39736), section IV.F of the preamble to the re-proposal of subpart W 
(Petroleum and Natural Gas Systems) published on April 12, 2010 (75 FR 
18608), section IV.F of the preambles to the final rules published on 
December 1, 2010 (75 FR 74774 and 75 FR 75076). As described in this 
section, the proposed rule does not significantly revise the 
established regulatory requirements and would not substantially change 
the equipment, monitoring, or reporting activities conducted by these 
facilities, or result in other substantial impacts for tribal 
facilities.
---------------------------------------------------------------------------

    \77\ EPA Policy on Consultation and Coordination with Indian 
Tribes, May 4, 2011. Available at: www.epa.gov/sites/default/files/2013-08/documents/cons-and-coord-with-indian-tribes-policy.pdf.
---------------------------------------------------------------------------

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 supplemental proposal is not 
subject to Executive Order 13045 because it does not concern an 
environmental health risk or safety risk.

H. Executive Order 13211: Actions That Significantly Affect Energy 
Supply, Distribution, or Use

    This action is not a ``significant energy action'' because it is 
not likely to have a significant adverse effect on the supply, 
distribution, or use of energy. The proposed amendments would implement 
requirements to collect additional data to understand new source 
categories or new emission sources for specific sectors; improve the 
EPA's understanding of factors that influence GHG emission rates; 
improve the existing emissions estimation methodologies; improve 
verification of collected data; and provide additional data to 
complement or inform other EPA programs. We are also proposing 
revisions that clarify or update provisions that have been unclear. In 
general, these changes would not substantially impact the supply, 
distribution, or use of energy. The EPA is proposing to require 
reporting of metered energy consumption from direct emitter facilities 
that currently report under part 98 in order to gain an improved 
understanding of the energy intensity (i.e., the amount of energy 
required to produce a given level of product or activity) of specific 
facilities or sectors, and to better inform our understanding of the 
potential indirect GHG emissions associated with certain sectors. The 
proposed regulations under subpart B include QA/QC requirements for 
energy meters for this source category, but the EPA understands that 
these meters would already be in place to monitor energy purchases. 
Therefore, the proposed regulations would not require installation of 
new equipment. Therefore, the proposed new subpart is not anticipated 
to add significant burden for existing reporters or to impact the 
supply, distribution, or use of energy. In addition to the data quality 
improvements described, the EPA is proposing confidentiality 
determinations for new and revised data elements in this proposed rule 
and for certain existing data elements for where the EPA has determined 
that the current determination is no longer appropriate. These proposed 
amendments and confidentiality determinations do not make any changes 
to the existing monitoring, calculation, and reporting requirements 
under part 98 that would affect the supply, distribution, or use of 
energy.

I. National Technology Transfer and Advancement Act

    This action involves technical standards. The EPA is proposing the 
use of several standards in establishing monitoring requirements in 
these proposed amendments. For proposed subpart B (Energy Consumption), 
the EPA is proposing that reporters must determine whether electric 
meters at the facility comply with the American National Standards 
Institute (ANSI) standard C12.1-2022 Electric Meters--Code for Electric 
Metering or another, similar consensus standard with accuracy 
specifications at least as stringent. The ANSI standard is widely 
referenced in state utility commission performance standards governing 
the accuracy of electric meters used for billing calculations. The 
proposed standard establishes acceptable performance criteria for 
electricity meters including accuracy class designations, current class 
designations, voltage and frequency ratings, test current values, 
service connection arrangements, pertinent dimensions, form 
designations, and environmental tests. The proposed requirements under 
subpart B allow for reporters to rely on manufacturer's certification, 
certification from the local utility supplying the electric service and 
meter, or to provide copy of written request that the existing meter be 
replaced by an electrical meter that meets the accuracy specifications 
of the cited ANSI standard. Additionally, the proposed requirements 
allow for reporters to use another consensus standard having accuracy 
specifications at least as stringent as the proposed ANSI standards 
C12.1-2022. Anyone may access the standard on the ANSI website 
(www.ansi.org) for additional information; the standard is available at 
the following web link: https://webstore.ansi.org/standards/nema/ansic122022. The standard is available to everyone at a cost determined 
by the ANSI ($423). The ANSI also offers memberships or subscriptions 
that allow unlimited access to their methods. Because facilities may 
rely on certifications from the meter manufacturer or the local 
utility, or use an alternative consensus standard that is at least as 
stringent as the proposed standards, the EPA has determined that 
obtaining these methods is not a significant financial burden, making 
the methods reasonably available for reporters.
    The EPA is proposing amendments to subpart HH (Municipal Solid 
Waste Landfills) at 40 CFR 98.344 that would allow for facilities that 
elect to conduct surface methane concentration monitoring to use 
measurement methods that are consistent with those already required and 
standard under existing landfills regulations. The proposed amendments 
would require landfill owners and operators that are already subject to 
the NSPS at 40 CFR part 60, subparts WWW or XXX, the EG at 40 CFR part 
60, subpart Cc of Cf, or according to the Federal plan at 40 CFR part 
62, subpart GGG or OOO to follow the monitoring measurement 
requirements under the NSPS, EG, or Federal plans; facilities would be 
able to use the measurements collected under the existing NSPS, EG, and 
Federal plan rules for estimation of emissions from cover leaks. We are 
also proposing to add surface methane concentration monitoring methods 
at 40 CFR 98.344 for landfill owners and operators that are not 
required to conduct surface measurements according to the NSPS

[[Page 32915]]

(40 CFR part 60, subpart WWW or XXX), EG (40 CFR part 60, subparts Cc 
or Cf as implemented in approved state plans), or Federal plans (40 CFR 
part 62, subparts GGG or OOO), but that voluntarily elect to conduct 
these surface measurements. Landfill owners and operators that are not 
required to conduct surface measurements according to the NSPS (40 CFR 
part 60, subpart WWW or XXX), EG (40 CFR part 60, subparts Cc or Cf), 
or Federal plans (40 CFR part 62, subparts GGG or OOO) would also have 
the option to use a default lower gas collection efficiency value in 
lieu of monitoring. Landfill reporters that elect to conduct surface 
measurements under part 98 would follow the procedures in 40 CFR 
60.765(c) and (d), which must be performed in accordance with Method 21 
of appendix A to part 60. Because we are proposing the option to use of 
a default lower gas collection efficiency and not requiring reporters 
that are not subject to the control requirements in the NSPS (40 CFR 
part 60, subpart WWW or XXX), EG (40 CFR part 60, subparts Cc or Cf), 
or Federal plans (40 CFR part 62, subparts GGG or OOO) to perform this 
surface methane concentration monitoring, the use of Method 21 is 
voluntary for those reporters. Therefore, the EPA has determined that 
use of Method 21 is not a significant financial burden and would be 
reasonably available for reporters.
    The EPA previously proposed to allow the use of the ISO standard 
designated as CSA/ANSI ISO 27916:2019, Carbon Dioxide Capture, 
Transportation and Geological Storage--Carbon Dioxide Storage Using 
Enhanced Oil Recovery (CO2-EOR) (2019) consistent with the proposed 
addition of proposed subpart VV (Geologic Sequestration of Carbon 
Dioxide With Enhanced Oil Recovery Using ISO 27916) in the 2022 Data 
Quality Improvements Proposal (87 FR 37035). The EPA also previously 
proposed paragraph 98.470(c) of subpart UU (Injection of Carbon 
Dioxide) to indicate that facilities that report under proposed subpart 
VV would not be required to report under subpart UU. In this 
supplemental action, the EPA is re-proposing section 40 CFR 98.470, 
section 40 CFR 98.480, and section 40 CFR 98.481 to clarify the 
applicability of the rule. The re-proposed section 98.480 would require 
that facilities that elect to use the CSA/ANSI ISO 27916:2019 method 
for the purpose of quantifying geologic sequestration of CO2 
in association with EOR operations would be required to report under 
proposed subpart VV. The re-proposed sections 40 CFR 98.470 and 40 CFR 
98.481 clarify that CO2-EOR projects previously reporting 
under subpart UU that begin using CSA/ANSI ISO 27916:2019 part-way 
through a reporting year must report under subpart UU for the portion 
of the year before CSA/ANSI ISO 27916:2019 was used and report under 
subpart VV for the portion of the year once CSA/ANSI ISO 27916:2019 
began to be used and thereafter. Our supporting analysis in the 2022 
Data Quality Improvements Proposal regarding the availability and the 
cost of obtaining the ISO standard are the same for this re-proposal, 
and we reiterate that the proposed amendments to subparts UU and VV 
would not impose a significant financial burden for reporters, as the 
proposed rule would apply to reporters that elect to use CSA/ANSI ISO 
27916:2019 for quantifying their geologic sequestration of 
CO2 in association with EOR operations.
    The EPA also proposes to allow the use of any one of the following 
standards for coke calcining facilities subject to proposed new subpart 
WW: (1) ASTM D3176-15 Standard Practice for Ultimate Analysis of Coal 
and Coke, (2) ASTM D5291-16 Standard Test Methods for Instrumental 
Determination of Carbon, Hydrogen, and Nitrogen in Petroleum Products 
and Lubricants, and (3) ASTM D5373-21 Standard Test Methods for 
Determination of Carbon, Hydrogen, and Nitrogen in Analysis Samples of 
Coal and Carbon in Analysis Samples of Coal and Coke. These proposed 
methods are used to determine the carbon content of petroleum coke. The 
EPA currently allows for the use of an earlier version of these 
proposed standard methods for the instrumental determination of carbon 
content in laboratory samples of petroleum coke in other sections of 
part 98, including the use of ASTM D3176-89, ASTM D5291-02, and ASTM 
D5373-08 in 40 CFR 98.244(b) (subpart X--Petrochemical Production) and 
40 CFR 98.254(i) (subpart Y--Petroleum Refineries). The EPA is 
proposing to allow the use of the updated versions of these standards 
(ASTM D3176-15, ASTM D5291-16, and ASTM D5373-21) to determine the 
carbon content of petroleum coke for proposed subpart WW (Coke 
Calciners). Anyone may access the standards on the ASTM website 
(www.astm.org/) for additional information. These standards are 
available to everyone at a cost determined by the ASTM (between $48 and 
$60 per method). The ASTM also offers memberships or subscriptions that 
allow unlimited access to their methods. The cost of obtaining these 
methods is not a significant financial burden, making the methods 
reasonably available for reporters.
    We are also proposing to allow the use of the following standard 
for coke calciners subject to subpart WW: Specifications, Tolerances, 
and Other Technical Requirements For Weighing and Measuring Devices, 
NIST Handbook 44 (2022). The EPA currently allows for the use of an 
earlier version of the proposed standard methods (Specifications, 
Tolerances, and Other Technical Requirements For Weighing and Measuring 
Devices, NIST Handbook 44 (2009)) for the calibration and maintenance 
of instruments used for weighing of mass of samples of petroleum coke 
in other sections of part 98, including 40 CFR 98.244(b) (subpart X). 
The EPA is proposing to allow the use of the updated versions of these 
standards (Specifications, Tolerances, and Other Technical Requirements 
For Weighing and Measuring Devices, NIST Handbook 44 (2022)) for 
performing mass measurements of petroleum coke for proposed subpart WW 
(Coke Calciners). Anyone may access the standards on the NIST website 
(www.nist.gov/index.html) for additional information. These standards 
are available to everyone at no cost, therefore the methods are 
reasonably available for reporters.
    The EPA proposes to allow the use of one of the following standards 
for calcium carbide production facilities subject to proposed subpart 
XX (Calcium Carbide Production): (1) ASTM D5373-08 Standard Test 
Methods for Instrumental Determination of Carbon, Hydrogen, and 
Nitrogen in Laboratory Samples of Coal, or (2) ASTM C25-06, Standard 
Test Methods for Chemical Analysis of Limestone, Quicklime, and 
Hydrated Lime. ASTM D5373-08 addresses the determination of carbon in 
the range of 54.9 percent m/m to 84.7 percent m/m, hydrogen in the 
range of 3.25 percent m/m to 5.10 percent m/m, and nitrogen in the 
range of 0.57 percent m/m to 1.80 percent m/m in the analysis sample of 
coal. The EPA currently allows for the use of ASTM D5373-08 in other 
sections of part 98, including in 40 CFR 98.244(b) (subpart X--
Petrochemical Production), 40 CFR 98.284(c) (subpart BB--Silicon 
Carbide Production), and 40 CFR 98.314(c) (subpart EE--Titanium 
Production) for the instrumental determination of carbon content in 
laboratory samples. Therefore, we are proposing to allow the use of 
ASTM D5373-08 for determination of carbon content of materials 
consumed, used, or produced at calcium carbide facilities.

[[Page 32916]]

The EPA currently allows for the use of ASTM C25-06 in other sections 
of part 98, including in 40 CFR 98.194(c) (subpart S--Lime Production) 
for chemical composition analysis of lime products and calcined 
byproducts and in 40 CFR 98.184(b) (subpart R--Lead Production) for 
analysis of flux materials such as limestone or dolomite. ASTM C25-06 
addresses the chemical analysis of high-calcium and dolomitic 
limestone, quicklime, and hydrated lime. We are proposing to allow the 
use of ASTM C25-06 for determination of carbon content of materials 
consumed, used, or produced at calcium carbide facilities, including 
analysis of materials such as limestone or dolomite. Anyone may access 
the standards on the ASTM website (www.astm.org/) for additional 
information. These standards are available to everyone at a cost 
determined by the ASTM (between $64 and $92 per method). The ASTM also 
offers memberships or subscriptions that allow unlimited access to 
their methods. The cost of obtaining these methods is not a significant 
financial burden, making the methods reasonably available for 
reporters.
    The EPA is not proposing to require the use of specific consensus 
standards for proposed new subparts YY (Caprolactam, Glyoxal, and 
Glyoxylic Acid Production) or ZZ (Ceramics Production), or for other 
proposed amendments to part 98.

J. Executive Order 12898: Federal Actions To Address Environmental 
Justice in Minority Populations and Low-Income Populations

    Executive Order 12898 (59 FR 7629, February 16, 1994) directs 
Federal agencies, to the greatest extent practicable and permitted by 
law, to make environmental justice part of their mission by identifying 
and addressing, as appropriate, disproportionately high and adverse 
human health or environmental effects of their programs, policies, and 
activities on minority populations (people of color) and low-income 
populations.
    The EPA believes that this proposed action does not directly 
concern human health or environmental conditions and therefore cannot 
be evaluated with respect to potentially disproportionate and adverse 
effects on people of color, low-income populations and/or indigenous 
peoples. This action does not affect the level of protection provided 
to human health or the environment, but instead, addresses information 
collection and reporting procedures.

K. Determination Under CAA Section 307(d)

    Pursuant to CAA section 307(d)(1)(V), the Administrator determines 
that this supplemental proposal is subject to the provisions of CAA 
section 307(d). Section 307(d)(1)(V) of the CAA provides that the 
provisions of CAA section 307(d) apply to ``such other actions as the 
Administrator may determine.''

List of Subjects in 40 CFR Part 98

    Environmental protection, Greenhouse gases, Reporting and 
recordkeeping requirements, Suppliers.

Michael S. Regan,
Administrator.

    For the reasons stated in the preamble, the Environmental 
Protection Agency proposes to amend title 40, chapter I, of the Code of 
Federal Regulations as follows:

PART 98--MANDATORY GREENHOUSE GAS REPORTING

0
1. The authority citation for part 98 continues to read as follows:

    Authority:  42 U.S.C. 7401-7671q.

Subpart A--General Provision

0
2. Amend Sec.  98.2 by revising paragraphs (a)(1), (a)(2), and (a)(3) 
introductory text as follows:

Sec.  98.2  Who must report?

    (a) * * *
    (1) A facility that contains any source category that is listed in 
Table A-3 of this subpart. For these facilities, the annual GHG report 
must cover energy consumption (subpart B of this part), stationary fuel 
combustion sources (subpart C of this part), miscellaneous use of 
carbonates (subpart U of this part), and all applicable source 
categories listed in Tables A-3 and A-4 of this subpart.
    (2) A facility that contains any source category that is listed in 
Table A-4 of this subpart and that emits 25,000 metric tons 
CO2e or more per year in combined emissions from stationary 
fuel combustion units, miscellaneous uses of carbonate, and all 
applicable source categories that are listed in Table A-3 and Table A-4 
of this subpart. For these facilities, the annual GHG report must cover 
energy consumption (subpart B of this part), stationary fuel combustion 
sources (subpart C of this part), miscellaneous use of carbonates 
(subpart U of this part), and all applicable source categories listed 
in Table A-3 and Table A-4 of this subpart.
    (3) A facility that in any calendar year starting in 2010 meets all 
three of the conditions listed in this paragraph (a)(3). For these 
facilities, the annual GHG report must cover energy consumption 
(subpart B of this part) and emissions from stationary fuel combustion 
sources.
* * * * *
0
3. Amend Sec.  98.3 by:
0
a. Revising paragraph (c)(4) introductory text;
0
b. Redesignating paragraphs (c)(4)(iv) and (v) as paragraphs (c)(4)(v) 
and (vi), respectively;
0
c. Adding new paragraph (c)(4)(iv);
0
d. Revising paragraphs (k)(1), (2), and (3);
0
e. Revising paragraphs (l)(1) introductory text, (l)(2) introductory 
text, (l)(2)(i), (l)(2)(ii)(C), (D), and (E), and (l)(2)(iii).
    The revisions and additions read as follows:

Sec.  98.3  What are the general monitoring, reporting, recordkeeping 
and verification requirements of this part?

* * * * *
    (c) * * *
    (4) For facilities, except as otherwise provided in paragraph 
(c)(12) of this section, report annual emissions of CO2, 
CH4, N2O, each fluorinated GHG (as defined in 
Sec.  98.6), and each fluorinated heat transfer fluid (as defined in 
Sec.  98.98), as well as annual quantities of electricity and thermal 
energy purchases, as follows.
* * * * *
    (iv) Annual quantity of electricity purchased expressed in 
kilowatt-hours (kWh) and annual quantity of thermal energy purchased 
expressed in mmBtu for all applicable source categories, per the 
requirements of subpart B of this part.
    (v) Except as provided in paragraph (c)(4)(vii) of this section, 
emissions and other data for individual units, processes, activities, 
and operations as specified in the ``Data reporting requirements'' 
section of each applicable subpart of this part.
    (vi) Indicate (yes or no) whether reported emissions include 
emissions from a cogeneration unit located at the facility.
* * * * *
    (k) * * *
    (1) A facility or supplier that first becomes subject to part 98 
due to a change in the GWP for one or more compounds in Table A-1 of 
this subpart, Global Warming Potentials, is not required to submit an 
annual GHG report for the reporting year during which the change in 
GWPs is published

[[Page 32917]]

in the Federal Register as a final rulemaking.
    (2) A facility or supplier that was already subject to one or more 
subparts of part 98 but becomes subject to one or more additional 
subparts due to a change in the GWP for one or more compounds in Table 
A-1 of this subpart, is not required to include those subparts to which 
the facility is subject only due to the change in the GWP in the annual 
GHG report submitted for the reporting year during which the change in 
GWPs is published in the Federal Register as a final rulemaking.
    (3) Starting on January 1 of the year after the year during which 
the change in GWPs is published in the Federal Register as a final 
rulemaking, facilities or suppliers identified in paragraph (k)(1) or 
(2) of this section must start monitoring and collecting GHG data in 
compliance with the applicable subparts of part 98 to which the 
facility is subject due to the change in the GWP for the annual 
greenhouse gas report for that reporting year, which is due by March 31 
of the following calendar year.
* * * * *
    (l) * * *
    (1) Best available monitoring methods. From January 1 to March 31 
of the year after the year during which the change in GWPs is published 
in the Federal Register as a final rulemaking, owners or operators 
subject to this paragraph (l) may use best available monitoring methods 
for any parameter (e.g., fuel use, feedstock rates) that cannot 
reasonably be measured according to the monitoring and QA/QC 
requirements of a relevant subpart. The owner or operator must use the 
calculation methodologies and equations in the ``Calculating GHG 
Emissions'' sections of each relevant subpart, but may use the best 
available monitoring method for any parameter for which it is not 
reasonably feasible to acquire, install, and operate a required piece 
of monitoring equipment by January 1 of the year after the year during 
which the change in GWPs is published in the Federal Register as a 
final rulemaking. Starting no later than April 1 of the year after the 
year during which the change in GWPs is published, the owner or 
operator must discontinue using best available methods and begin 
following all applicable monitoring and QA/QC requirements of this 
part, except as provided in paragraph (l)(2) of this section. Best 
available monitoring methods means any of the following methods:
* * * * *
    (2) Requests for extension of the use of best available monitoring 
methods. The owner or operator may submit a request to the 
Administrator to use one or more best available monitoring methods 
beyond March 31 of the year after the year during which the change in 
GWPs is published in the Federal Register as a final rulemaking.
    (i) Timing of request. The extension request must be submitted to 
EPA no later than January 31 of the year after the year during which 
the change in GWPs is published in the Federal Register as a final 
rulemaking.
    (ii) * * *
    (C) A description of the reasons that the needed equipment could 
not be obtained and installed before April 1 of the year after the year 
during which the change in GWPs is published in the Federal Register as 
a final rulemaking.
    (D) If the reason for the extension is that the equipment cannot be 
purchased and delivered by April 1 of the year after the year during 
which the change in GWPs is published in the Federal Register as a 
final rulemaking, include supporting documentation such as the date the 
monitoring equipment was ordered, investigation of alternative 
suppliers and the dates by which alternative vendors promised delivery, 
backorder notices or unexpected delays, descriptions of actions taken 
to expedite delivery, and the current expected date of delivery.
    (E) If the reason for the extension is that the equipment cannot be 
installed without a process unit shutdown, include supporting 
documentation demonstrating that it is not practicable to isolate the 
equipment and install the monitoring instrument without a full process 
unit shutdown. Include the date of the most recent process unit 
shutdown, the frequency of shutdowns for this process unit, and the 
date of the next planned shutdown during which the monitoring equipment 
can be installed. If there has been a shutdown or if there is a planned 
process unit shutdown between November 29 of the year during which the 
change in GWPs is published in the Federal Register as a final 
rulemaking and April 1 of the year after the year during which the 
change in GWPs is published, include a justification of why the 
equipment could not be obtained and installed during that shutdown.
* * * * *
    (iii) Approval criteria. To obtain approval, the owner or operator 
must demonstrate to the Administrator's satisfaction that it is not 
reasonably feasible to acquire, install, and operate a required piece 
of monitoring equipment by April 1 of the year after the year during 
which the change in GWPs is published in the Federal Register as a 
final rulemaking. The use of best available methods under this 
paragraph (l) will not be approved beyond December 31 of the year after 
the year during which the change in GWPs is published.
0
4. Amend Sec.  98.6 by:
0
a. Adding a definition for ``Cyclic'' and ``Fluorinated heat transfer 
fluids'' in alphabetic order;
0
b. Revising the definitions for ``Bulk''; ``Fluorinated greenhouse 
gas'', ``Fluorinated greenhouse gas (GHG) group'', ``Greenhouse gas or 
GHG'', and ``Process vent'';
0
c. Removing the definition for ``Other fluorinated GHGs''; and
0
d. Adding definitions for ``Remaining fluorinated GHGs'', ``Saturated 
chlorofluorocarbons (CFCs)'', ``Unsaturated bromochlorofluorocarbons 
(BCFCs)'', ``Unsaturated bromofluorocarbons (BFCs)'', ``Unsaturated 
chlorofluorocarbons (CFCs), ``Unsaturated hydrobromochlorofluorocarbons 
(HBCFCs)'', and ``Unsaturated hydrobromofluorocarbons (HBFCs)'' in 
alphabetic order.
    The revisions and additions read as follows:

Sec.  98.6  Definitions.

* * * * *
    Bulk, with respect to industrial GHG suppliers and CO2 
suppliers, means a transfer of gas in any amount that is in a container 
for the transportation or storage of that substance such as cylinders, 
drums, ISO tanks, and small cans. An industrial gas or CO2 
that must first be transferred from a container to another container, 
vessel, or piece of equipment in order to realize its intended use is a 
bulk substance. An industrial GHG or CO2 that is contained 
in a manufactured product such as electrical equipment, appliances, 
aerosol cans, or foams is not a bulk substance.
* * * * *
    Cyclic, in the context of fluorinated GHGs, means a fluorinated GHG 
in which three or more carbon atoms are connected to form a ring.
* * * * *
    Fluorinated greenhouse gas (GHG) means sulfur hexafluoride 
(SF6), nitrogen trifluoride (NF3), and any 
fluorocarbon except for controlled substances as defined at 40 CFR part 
82, subpart A and substances with vapor pressures of less than 1 mm of 
Hg absolute at 25 degrees C. With these exceptions, ``fluorinated GHG'' 
includes but is not limited to any hydrofluorocarbon, any

[[Page 32918]]

perfluorocarbon, any fully fluorinated linear, branched or cyclic 
alkane, ether, tertiary amine or aminoether, any perfluoropolyether, 
and any hydrofluoropolyether.
    Fluorinated greenhouse gas (GHG) group means one of the following 
sets of fluorinated GHGs:
    (1) Fully fluorinated GHGs;
    (2) Saturated hydrofluorocarbons with two or fewer carbon-hydrogen 
bonds;
    (3) Saturated hydrofluorocarbons with three or more carbon-hydrogen 
bonds;
    (4) Saturated hydrofluoroethers and hydrochlorofluoroethers with 
one carbon-hydrogen bond;
    (5) Saturated hydrofluoroethers and hydrochlorofluoroethers with 
two carbon-hydrogen bonds;
    (6) Saturated hydrofluoroethers and hydrochlorofluoroethers with 
three or more carbon-hydrogen bonds;
    (7) Saturated chlorofluorocarbons (CFCs);
    (8) Fluorinated formates;
    (9) Cyclic forms of the following: unsaturated perfluorocarbons 
(PFCs), unsaturated HFCs, unsaturated CFCs, unsaturated 
hydrochlorofluorocarbons (HCFCs), unsaturated bromofluorocarbons 
(BFCs), unsaturated bromochlorofluorocarbons (BCFCs), unsaturated 
hydrobromofluorocarbons (HBFCs), unsaturated 
hydrobromochlorofluorocarbons (HBCFCs), unsaturated halogenated ethers, 
and unsaturated halogenated esters;
    (10) Fluorinated acetates, carbonofluoridates, and fluorinated 
alcohols other than fluorotelomer alcohols;
    (11) Fluorinated aldehydes, fluorinated ketones and non-cyclic 
forms of the following: unsaturated PFCs, unsaturated HFCs, unsaturated 
CFCs, unsaturated HCFCs, unsaturated BFCs, unsaturated BCFCs, 
unsaturated HBFCs, unsaturated HBCFCs, unsaturated halogenated ethers, 
and unsaturated halogenated esters;
    (12) Fluorotelomer alcohols;
    (13) Fluorinated GHGs with carbon-iodine bonds; or
    (14) Remaining fluorinated GHGs.
    Fluorinated heat transfer fluids means fluorinated GHGs used for 
temperature control, device testing, cleaning substrate surfaces and 
other parts, other solvent applications, and soldering in certain types 
of electronics manufacturing production processes and in other 
industries. Fluorinated heat transfer fluids do not include fluorinated 
GHGs used as lubricants or surfactants in electronics manufacturing. 
For fluorinated heat transfer fluids, the lower vapor pressure limit of 
1 mm Hg in absolute at 25 [deg]C in the definition of ``fluorinated 
greenhouse gas'' in Sec.  98.6 shall not apply. Fluorinated heat 
transfer fluids include, but are not limited to, perfluoropolyethers 
(including PFPMIE), perfluoroalkylamines, perfluoroalkylmorpholines, 
perfluoroalkanes, perfluoroethers, perfluorocyclic ethers, and 
hydrofluoroethers. Fluorinated heat transfer fluids include HFC-43-
10meee but do not include other hydrofluorocarbons.
* * * * *
    Greenhouse gas or GHG means carbon dioxide (CO2), 
methane (CH4), nitrous oxide (N2O), and 
fluorinated greenhouse gases (GHGs) as defined in this section.
* * * * *
    Process vent means a gas stream that: Is discharged through a 
conveyance to the atmosphere either directly or after passing through a 
control device; originates from a unit operation, including but not 
limited to reactors (including reformers, crackers, and furnaces, and 
separation equipment for products and recovered byproducts); and 
contains or has the potential to contain GHG that is generated in the 
process. Process vent does not include safety device discharges, 
equipment leaks, gas streams routed to a fuel gas system or to a flare, 
discharges from storage tanks.
* * * * *
    Remaining fluorinated GHGs means fluorinated GHGs that are none of 
the following:
    (1) Fully fluorinated GHGs;
    (2) Saturated hydrofluorocarbons with two or fewer carbon-hydrogen 
bonds;
    (3) Saturated hydrofluorocarbons with three or more carbon-hydrogen 
bonds;
    (4) Saturated hydrofluoroethers and hydrochlorofluoroethers with 
one carbon-hydrogen bond;
    (5) Saturated hydrofluoroethers and hydrochlorofluoroethers with 
two carbon-hydrogen bonds;
    (6) Saturated hydrofluoroethers and hydrochlorofluoroethers with 
three or more carbon-hydrogen bonds;
    (7) Saturated chlorofluorocarbons (CFCs);
    (8) Fluorinated formates;
    (9) Cyclic forms of the following: unsaturated perfluorocarbons 
(PFCs), unsaturated HFCs, unsaturated CFCs, unsaturated 
hydrochlorofluorocarbons (HCFCs), unsaturated bromofluorocarbons 
(BFCs), unsaturated bromochlorofluorocarbons (BCFCs), unsaturated 
hydrobromofluorocarbons (HBFCs), unsaturated 
hydrobromochlorofluorocarbons (HBCFCs), unsaturated halogenated ethers, 
and unsaturated halogenated esters;
    (10) Fluorinated acetates, carbonofluoridates, and fluorinated 
alcohols other than fluorotelomer alcohols;
    (11) Fluorinated aldehydes, fluorinated ketones and non-cyclic 
forms of the following: unsaturated PFCs, unsaturated HFCs, unsaturated 
CFCs, unsaturated HCFCs, unsaturated BFCs, unsaturated BCFCs, 
unsaturated HBFCs, unsaturated HBCFCs, unsaturated halogenated ethers, 
and unsaturated halogenated esters;
    (12) Fluorotelomer alcohols; or
    (13) Fluorinated GHGs with carbon-iodine bonds.
* * * * *
    Saturated chlorofluorocarbons (CFCs) means fluorinated GHGs that 
contain only chlorine, fluorine, and carbon and that contain only 
single bonds.
* * * * *
    Unsaturated bromochlorofluoro-carbons (BCFCs) means fluorinated 
GHGs that contain only bromine, chlorine, fluorine, and carbon and that 
contain one or more bonds that are not single bonds.
    Unsaturated bromofluorocarbons (BFCs) means fluorinated GHGs that 
contain only bromine, fluorine, and carbon and that contain one or more 
bonds that are not single bonds.
    Unsaturated chlorofluoro-carbons (CFCs) means fluorinated GHGs that 
contain only chlorine, fluorine, and carbon and that contain one or 
more bonds that are not single bonds.
* * * * *
    Unsaturated hydrobromochlorofluoro-carbons (HBCFCs) means 
fluorinated GHGs that contain only hydrogen, bromine, chlorine, 
fluorine, and carbon and that contain one or more bonds that are not 
single bonds.
    Unsaturated hydrobromofluoro carbons (HBFCs) means fluorinated GHGs 
that contain only hydrogen, bromine, fluorine, and carbon and that 
contain one or more bonds that are not single bonds.
* * * * *
0
5. Amend Sec.  98.7 by:
0
a. Adding paragraph (a);
0
b. Revising paragraphs (e)(1), (e)(18), (e)(26), (e)(27), and (i)(1); 
and
0
c. Adding paragraphs (e)(50) through (52), (g)(6) and (i)(2).

Sec.  98.7  What standardized methods are incorporated by reference 
into this part?

* * * * *
    (a) The following material is available for purchase from the 
American National Standards Institute (ANSI), 25 W 43rd Street, 4th 
Floor, New York, NY 10036, Telephone (212) 642-4980, and is also 
available at the following website: http://www.ansi.org.

[[Page 32919]]

    (1) ANSI C12.1-2022 Electric Meters--Code for Electricity Metering, 
incorporation by reference (IBR) approved for Sec.  98.24(b).
    (2) [Reserved]
* * * * *
    (e) * * *
    (1) ASTM C25-06 Standard Test Method for Chemical Analysis of 
Limestone, Quicklime, and Hydrated Lime, incorporation by reference 
(IBR) approved for Sec. Sec.  98.114(b), 98.174(b), 98.184(b), 
98.194(c), 98.334(b), and 98.504(b).
* * * * *
    (18) ASTM D3176-89 (Reapproved 2002) Standard Practice for Ultimate 
Analysis of Coal and Coke, IBR approved for Sec. Sec.  98.74(c), 
98.164(b), 98.244(b), 98.284(c), 98.284(d), 98.314(c), 98.314(d), and 
98.314(f).
* * * * *
    (26) ASTM D5291-02 (Reapproved 2007) Standard Test Methods for 
Instrumental Determination of Carbon, Hydrogen, and Nitrogen in 
Petroleum Products and Lubricants, IBR approved for Sec. Sec.  
98.74(c), 98.164(b), and 98.244(b).
    (27) ASTM D5373-08 Standard Test Methods for Instrumental 
Determination of Carbon, Hydrogen, and Nitrogen in Laboratory Samples 
of Coal, IBR approved for Sec. Sec.  98.74(c), 98.114(b), 98.164(b), 
98.174(b), 98.184(b), 98.244(b), 98.274(b), 98.284(c), 98.284(d), 
98.314(c), 98.314(d), 98.314(f), 98.334(b), and 98.504(b).
* * * * *
    (50) ASTM D3176-15 Standard Practice for Ultimate Analysis of Coal 
and Coke, IBR approved for Sec.  98.494(c).
    (51) ASTM D5291-16 Standard Test Methods for Instrumental 
Determination of Carbon, Hydrogen, and Nitrogen in Petroleum Products 
and Lubricants, IBR approved for Sec.  98.494(c).
    (52) ASTM D5373-21 Standard Test Methods for Determination of 
Carbon, Hydrogen, and Nitrogen in Analysis Samples of Coal and Carbon 
in Analysis Samples of Coal and Coke, IBR approved for Sec.  98.494(c).
* * * * *
    (g) * * *
    (6) CSA/ANSI ISO 27916:19, Carbon dioxide capture, transportation 
and geological storage--Carbon dioxide storage using enhanced oil 
recovery (CO2-EOR). Edition 1. January 2019; IBR approved 
for Sec. Sec.  98.470(c), 98.480(a), 98.481(a), 98.481(b), 98.481(c), 
98.482, 98.483, 98.484, 98.485, 98.486(g), 98.487, 98.488(a)(5), and 
98.489.
* * * * *
    (i) * * *
    (1) Specifications, Tolerances, and Other Technical Requirements 
For Weighing and Measuring Devices, NIST Handbook 44 (2009), 
incorporation by reference (IBR) approved for Sec. Sec.  98.244(b) and 
98.344(a).
    (2) Specifications, Tolerances, and Other Technical Requirements 
For Weighing and Measuring Devices, NIST Handbook 44 (2022), IBR 
approved for Sec.  98.494(b).
* * * * *
0
6. Revise table A-1 to subpart A of part 98 to read as follows:

                          Table A-1 to Subpart A of Part 98--Global Warming Potentials
                                             [100-Year time horizon]
----------------------------------------------------------------------------------------------------------------
                                                                                                  Global warming
                     Name                           CAS No.             Chemical formula          potential (100
                                                                                                       yr.)
----------------------------------------------------------------------------------------------------------------
                                             Chemical-Specific GWPs
----------------------------------------------------------------------------------------------------------------
Carbon dioxide................................        124-38-9  CO2.............................               1
Methane.......................................         74-82-8  CH4.............................      \a\ \d\ 28
Nitrous oxide.................................      10024-97-2  N2O.............................     \a\ \d\ 265
----------------------------------------------------------------------------------------------------------------
                                             Fully Fluorinated GHGs
----------------------------------------------------------------------------------------------------------------
Sulfur hexafluoride...........................       2551-62-4  SF6.............................  \a\ \d\ 23,500
Trifluoromethyl sulphur pentafluoride.........        373-80-8  SF5CF3..........................      \d\ 17,400
Nitrogen trifluoride..........................       7783-54-2  NF3.............................      \d\ 16,100
PFC-14 (Perfluoromethane).....................         75-73-0  CF4.............................   \a\ \d\ 6,630
PFC-116 (Perfluoroethane).....................         76-16-4  C2F6............................  \a\ \d\ 11,100
PFC-218 (Perfluoropropane)....................         76-19-7  C3F8............................   \a\ \d\ 8,900
Perfluorocyclopropane.........................        931-91-9  c-C3F6..........................       \d\ 9,200
PFC-3-1-10 (Perfluorobutane)..................        355-25-9  C4F10...........................   \a\ \d\ 9,200
PFC-318 (Perfluorocyclobutane)................        115-25-3  c-C4F8..........................   \a\ \d\ 9,540
Perfluorotetrahydrofuran......................        773-14-8  c-C4F8O.........................      \e\ 13,900
PFC-4-1-12 (Perfluoropentane).................        678-26-2  C5F12...........................   \a\ \d\ 8,550
PFC-5-1-14 (Perfluorohexane, FC-72)...........        355-42-0  C6F14...........................   \a\ \d\ 7,910
PFC-6-1-12....................................        335-57-9  C7F16; CF3(CF2)5CF3.............       \b\ 7,820
PFC-7-1-18....................................        307-34-6  C8F18; CF3(CF2)6CF3.............       \b\ 7,620
PFC-9-1-18....................................        306-94-5  C10F18..........................       \d\ 7,190
PFPMIE (HT-70)................................              NA  CF3OCF(CF3)CF2OCF2OCF3..........       \d\ 9,710
Perfluorodecalin (cis)........................      60433-11-6  Z-C10F18........................   \b\ \d\ 7,240
Perfluorodecalin (trans)......................      60433-12-7  E-C10F18........................   \b\ \d\ 6,290
Perfluorotriethylamine........................        359-70-6  N(C2F5)3........................      \e\ 10,300
Perfluorotripropylamine.......................        338-83-0  N(CF2CF2CF3)3...................       \e\ 9,030
Perfluorotributylamine........................        311-89-7  N(CF2CF2CF2CF3)3................       \e\ 8,490
Perfluorotripentylamine.......................        338-84-1  N(CF2CF2CF2CF2CF3)3.............       \e\ 7,260
----------------------------------------------------------------------------------------------------------------
                   Saturated Hydrofluorocarbons (HFCs) With Two or Fewer Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
(4s,5s)-1,1,2,2,3,3,4,5-octafluorocyclopentane     158389-18-5  trans-cyc (-CF2CF2CF2CHFCHF-)...         \e\ 258
HFC-23........................................         75-46-7  CHF3............................  \a\ \d\ 12,400
HFC-32........................................         75-10-5  CH2F2...........................     \a\ \d\ 677
HFC-125.......................................        354-33-6  C2HF5...........................   \a\ \d\ 3,170
HFC-134.......................................        359-35-3  C2H2F4..........................   \a\ \d\ 1,120
HFC-134a......................................        811-97-2  CH2FCF3.........................   \a\ \d\ 1,300
HFC-227ca.....................................       2252-84-8  CF3CF2CHF2......................       \b\ 2,640
HFC-227ea.....................................        431-89-0  C3HF7...........................   \a\ \d\ 3,350
HFC-236cb.....................................        677-56-5  CH2FCF2CF3......................       \d\ 1,210
HFC-236ea.....................................        431-63-0  CHF2CHFCF3......................       \d\ 1,330

[[Page 32920]]

 
HFC-236fa.....................................        690-39-1  C3H2F6..........................   \a\ \d\ 8,060
HFC-329p......................................        375-17-7  CHF2CF2CF2CF3...................       \b\ 2,360
HFC-43-10mee..................................     138495-42-8  CF3CFHCFHCF2CF3.................   \a\ \d\ 1,650
----------------------------------------------------------------------------------------------------------------
                  Saturated Hydrofluorocarbons (HFCs) With Three or More Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
1,1,2,2,3,3-hexafluorocyclopentane............     123768-18-3  cyc (-CF2CF2CF2CH2CH2-).........         \e\ 120
1,1,2,2,3,3,4-heptafluorocyclopentane.........      15290-77-4  cyc (-CF2CF2CF2CHFCH2-).........         \e\ 231
HFC-41........................................        593-53-3  CH3F............................     \a\ \d\ 116
HFC-143.......................................        430-66-0  C2H3F3..........................     \a\ \d\ 328
HFC-143a......................................        420-46-2  C2H3F3..........................   \a\ \d\ 4,800
HFC-152.......................................        624-72-6  CH2FCH2F........................          \d\ 16
HFC-152a......................................         75-37-6  CH3CHF2.........................     \a\ \d\ 138
HFC-161.......................................        353-36-6  CH3CH2F.........................           \d\ 4
HFC-245ca.....................................        679-86-7  C3H3F5..........................     \a\ \d\ 716
HFC-245cb.....................................       1814-88-6  CF3CF2CH3.......................       \b\ 4,620
HFC-245ea.....................................      24270-66-4  CHF2CHFCHF2.....................         \b\ 235
HFC-245eb.....................................        431-31-2  CH2FCHFCF3......................         \b\ 290
HFC-245fa.....................................        460-73-1  CHF2CH2CF3......................         \d\ 858
HFC-263fb.....................................        421-07-8  CH3CH2CF3.......................          \b\ 76
HFC-272ca.....................................        420-45-1  CH3CF2CH3.......................         \b\ 144
HFC-365mfc....................................        406-58-6  CH3CF2CH2CF3....................         \d\ 804
----------------------------------------------------------------------------------------------------------------
      Saturated Hydrofluoroethers (HFEs) and Hydrochlorofluoroethers (HCFEs) With One Carbon-Hydrogen Bond
----------------------------------------------------------------------------------------------------------------
HFE-125.......................................       3822-68-2  CHF2OCF3........................      \d\ 12,400
HFE-227ea.....................................       2356-62-9  CF3CHFOCF3......................       \d\ 6,450
HFE-329mcc2...................................     134769-21-4  CF3CF2OCF2CHF2..................       \d\ 3,070
HFE-329me3....................................     428454-68-6  CF3CFHCF2OCF3...................       \b\ 4,550
1,1,1,2,2,3,3-Heptafluoro-3-(1,2,2,2-                3330-15-2  CF3CF2CF2OCHFCF3................       \b\ 6,490
 tetrafluoroethoxy)-propane.
----------------------------------------------------------------------------------------------------------------
                             Saturated HFEs and HCFEs With Two Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
HFE-134 (HG-00)...............................       1691-17-4  CHF2OCHF2.......................       \d\ 5,560
HFE-236ca.....................................      32778-11-3  CHF2OCF2CHF2....................       \b\ 4,240
HFE-236ca12 (HG-10)...........................      78522-47-1  CHF2OCF2OCHF2...................       \d\ 5,350
HFE-236ea2 (Desflurane).......................      57041-67-5  CHF2OCHFCF3.....................       \d\ 1,790
HFE-236fa.....................................      20193-67-3  CF3CH2OCF3......................         \d\ 979
HFE-338mcf2...................................     156053-88-2  CF3CF2OCH2CF3...................         \d\ 929
HFE-338mmz1...................................      26103-08-2  CHF2OCH(CF3)2...................       \d\ 2,620
HFE-338pcc13 (HG-01)..........................     188690-78-0  CHF2OCF2CF2OCHF2................       \d\ 2,910
HFE-43-10pccc (H-Galden 1040x, HG-11).........        E1730133  CHF2OCF2OC2F4OCHF2..............       \d\ 2,820
HCFE-235ca2 (Enflurane).......................      13838-16-9  CHF2OCF2CHFCl...................         \b\ 583
HCFE-235da2 (Isoflurane)......................      26675-46-7  CHF2OCHClCF3....................         \d\ 491
HG-02.........................................     205367-61-9  HF2C-(OCF2CF2)2-OCF2H...........   \b\ \d\ 2,730
HG-03.........................................     173350-37-3  HF2C-(OCF2CF2)3-OCF2H...........   \b\ \d\ 2,850
HG-20.........................................     249932-25-0  HF2C-(OCF2)2-OCF2H..............       \b\ 5,300
HG-21.........................................     249932-26-1  HF2C-OCF2CF2OCF2OCF2O-CF2H......       \b\ 3,890
HG-30.........................................     188690-77-9  HF2C-(OCF2)3-OCF2H..............       \b\ 7,330
1,1,3,3,4,4,6,6,7,7,9,9,10,10,12,12,13,13,15,1     173350-38-4  HCF2O(CF2CF2O)4CF2H.............       \b\ 3,630
 5-eicosafluoro-2,5,8,11,14-
 Pentaoxapentadecane.
1,1,2-Trifluoro-2-(trifluoromethoxy)-ethane...      84011-06-3  CHF2CHFOCF3.....................       \b\ 1,240
Trifluoro(fluoromethoxy)methane...............       2261-01-0  CH2FOCF3........................         \b\ 751
----------------------------------------------------------------------------------------------------------------
                        Saturated HFEs and HCFEs With Three or More Carbon-Hydrogen Bonds
----------------------------------------------------------------------------------------------------------------
HFE-143a......................................        421-14-7  CH3OCF3.........................         \d\ 523
HFE-245cb2....................................      22410-44-2  CH3OCF2CF3......................         \d\ 654
HFE-245fa1....................................      84011-15-4  CHF2CH2OCF3.....................         \d\ 828
HFE-245fa2....................................       1885-48-9  CHF2OCH2CF3.....................         \d\ 812
HFE-254cb2....................................        425-88-7  CH3OCF2CHF2.....................         \d\ 301
HFE-263fb2....................................        460-43-5  CF3CH2OCH3......................           \d\ 1
HFE-263m1; R-E-143a...........................        690-22-2  CF3OCH2CH3......................          \b\ 29
HFE-347mcc3 (HFE-7000)........................        375-03-1  CH3OCF2CF2CF3...................         \d\ 530
HFE-347mcf2...................................     171182-95-9  CF3CF2OCH2CHF2..................         \d\ 854
HFE-347mmy1...................................      22052-84-2  CH3OCF(CF3)2....................         \d\ 363
HFE-347mmz1 (Sevoflurane).....................      28523-86-6  (CF3)2CHOCH2F...................     \c\ \d\ 216
HFE-347pcf2...................................        406-78-0  CHF2CF2OCH2CF3..................         \d\ 889
HFE-356mec3...................................        382-34-3  CH3OCF2CHFCF3...................         \d\ 387
HFE-356mff2...................................        333-36-8  CF3CH2OCH2CF3...................          \b\ 17
HFE-356mmz1...................................      13171-18-1  (CF3)2CHOCH3....................          \d\ 14
HFE-356pcc3...................................     160620-20-2  CH3OCF2CF2CHF2..................         \d\ 413
HFE-356pcf2...................................      50807-77-7  CHF2CH2OCF2CHF2.................         \d\ 719
HFE-356pcf3...................................      35042-99-0  CHF2OCH2CF2CHF2.................         \d\ 446
HFE-365mcf2...................................      22052-81-9  CF3CF2OCH2CH3...................          \b\ 58
HFE-365mcf3...................................        378-16-5  CF3CF2CH2OCH3...................        \d\ 0.99
HFE-374pc2....................................        512-51-6  CH3CH2OCF2CHF2..................         \d\ 627
HFE-449s1 (HFE-7100) Chemical blend...........     163702-07-6  C4F9OCH3........................         \d\ 421

[[Page 32921]]

 
                                                   163702-08-7  (CF3)2CFCF2OCH3.................  ..............
HFE-569sf2 (HFE-7200) Chemical blend..........     163702-05-4  C4F9OC2H5.......................          \d\ 57
                                                   163702-06-5  (CF3)2CFCF2OC2H5................  ..............
HFE-7300......................................     132182-92-4  (CF3)2CFCFOC2H5CF2CF2CF3........         \e\ 405
HFE-7500......................................     297730-93-9  n-C3F7CFOC2H5CF(CF3)2...........          \e\ 13
HG'-01........................................      73287-23-7  CH3OCF2CF2OCH3..................         \b\ 222
HG'-02........................................     485399-46-0  CH3O(CF2CF2O)2CH3...............         \b\ 236
HG'-03........................................     485399-48-2  CH3O(CF2CF2O)3CH3...............         \b\ 221
Difluoro(methoxy)methane......................        359-15-9  CH3OCHF2........................         \b\ 144
2-Chloro-1,1,2-trifluoro-1-methoxyethane......        425-87-6  CH3OCF2CHFCl....................         \b\ 122
1-Ethoxy-1,1,2,2,3,3,3-heptafluoropropane.....      22052-86-4  CF3CF2CF2OCH2CH3................          \b\ 61
2-Ethoxy-3,3,4,4,5-pentafluorotetrahydro-2,5-      920979-28-8  C12H5F19O2......................          \b\ 56
 bis[1,2,2,2-tetrafluoro-1-
 (trifluoromethyl)ethyl]-furan.
1-Ethoxy-1,1,2,3,3,3-hexafluoropropane........        380-34-7  CF3CHFCF2OCH2CH3................          \b\ 23
Fluoro(methoxy)methane........................        460-22-0  CH3OCH2F........................          \b\ 13
1,1,2,2-Tetrafluoro-3-methoxy-propane; Methyl       60598-17-6  CHF2CF2CH2OCH3..................    \b\ \d\ 0.49
 2,2,3,3-tetrafluoropropyl ether.
1,1,2,2-Tetrafluoro-1-(fluoromethoxy)ethane...      37031-31-5  CH2FOCF2CF2H....................         \b\ 871
Difluoro(fluoromethoxy)methane................        461-63-2  CH2FOCHF2.......................         \b\ 617
Fluoro(fluoromethoxy)methane..................        462-51-1  CH2FOCH2F.......................         \b\ 130
----------------------------------------------------------------------------------------------------------------
                                      Saturated Chlorofluorocarbons (CFCs)
----------------------------------------------------------------------------------------------------------------
E-R316c.......................................       3832-15-3  trans-cyc (-CClFCF2CF2CClF-)....       \e\ 4,230
Z-R316c.......................................       3934-26-7  cis-cyc (-CClFCF2CF2CClF-)......       \e\ 5,660
----------------------------------------------------------------------------------------------------------------
                                              Fluorinated Formates
----------------------------------------------------------------------------------------------------------------
Trifluoromethyl formate.......................      85358-65-2  HCOOCF3.........................         \b\ 588
Perfluoroethyl formate........................     313064-40-3  HCOOCF2CF3......................         \b\ 580
1,2,2,2-Tetrafluoroethyl formate..............     481631-19-0  HCOOCHFCF3......................         \b\ 470
Perfluorobutyl formate........................     197218-56-7  HCOOCF2CF2CF2CF3................         \b\ 392
Perfluoropropyl formate.......................     271257-42-2  HCOOCF2CF2CF3...................         \b\ 376
1,1,1,3,3,3-Hexafluoropropan-2-yl formate.....     856766-70-6  HCOOCH(CF3)2....................         \b\ 333
2,2,2-Trifluoroethyl formate..................      32042-38-9  HCOOCH2CF3......................          \b\ 33
3,3,3-Trifluoropropyl formate.................    1344118-09-7  HCOOCH2CH2CF3...................          \b\ 17
----------------------------------------------------------------------------------------------------------------
                                              Fluorinated Acetates
----------------------------------------------------------------------------------------------------------------
Methyl 2,2,2-trifluoroacetate.................        431-47-0  CF3COOCH3.......................          \b\ 52
1,1-Difluoroethyl 2,2,2-trifluoroacetate......    1344118-13-3  CF3COOCF2CH3....................          \b\ 31
Difluoromethyl 2,2,2-trifluoroacetate.........       2024-86-4  CF3COOCHF2......................          \b\ 27
2,2,2-Trifluoroethyl 2,2,2-trifluoroacetate...        407-38-5  CF3COOCH2CF3....................           \b\ 7
Methyl 2,2-difluoroacetate....................        433-53-4  HCF2COOCH3......................           \b\ 3
Perfluoroethyl acetate........................     343269-97-6  CH3COOCF2CF3....................       \b\ \d\ 2
Trifluoromethyl acetate.......................      74123-20-9  CH3COOCF3.......................       \b\ \d\ 2
Perfluoropropyl acetate.......................    1344118-10-0  CH3COOCF2CF2CF3.................      \b,\ \d\ 2
Perfluorobutyl acetate........................     209597-28-4  CH3COOCF2CF2CF2CF3..............       \b\ \d\ 2
Ethyl 2,2,2-trifluoroacetate..................        383-63-1  CF3COOCH2CH3....................       \b\ \d\ 1
----------------------------------------------------------------------------------------------------------------
                                               Carbonofluoridates
----------------------------------------------------------------------------------------------------------------
Methyl carbonofluoridate......................       1538-06-3  FCOOCH3.........................          \b\ 95
1,1-Difluoroethyl carbonofluoridate...........    1344118-11-1  FCOOCF2CH3......................          \b\ 27
----------------------------------------------------------------------------------------------------------------
                             Fluorinated Alcohols Other Than Fluorotelomer Alcohols
----------------------------------------------------------------------------------------------------------------
Bis(trifluoromethyl)-methanol.................        920-66-1  (CF3)2CHOH......................         \d\ 182
2,2,3,3,4,4,5,5-Octafluorocyclopentanol.......      16621-87-7  cyc (-(CF2)4CH(OH)-)............          \d\ 13
2,2,3,3,3-Pentafluoropropanol.................        422-05-9  CF3CF2CH2OH.....................          \d\ 19
2,2,3,3,4,4,4-Heptafluorobutan-1-ol...........        375-01-9  C3F7CH2OH.......................      \b\ \d\ 34
2,2,2-Trifluoroethanol........................         75-89-8  CF3CH2OH........................          \b\ 20
2,2,3,4,4,4-Hexafluoro-1-butanol..............        382-31-0  CF3CHFCF2CH2OH..................          \b\ 17
2,2,3,3-Tetrafluoro-1-propanol................         76-37-9  CHF2CF2CH2OH....................          \b\ 13
2,2-Difluoroethanol...........................        359-13-7  CHF2CH2OH.......................           \b\ 3
2-Fluoroethanol...............................        371-62-0  CH2FCH2OH.......................         \b\ 1.1
4,4,4-Trifluorobutan-1-ol.....................        461-18-7  CF3(CH2)2CH2OH..................        \b\ 0.05
----------------------------------------------------------------------------------------------------------------
                                 Non-Cyclic, Unsaturated Perfluorocarbons (PFCs)
----------------------------------------------------------------------------------------------------------------
PFC-1114; TFE.................................        116-14-3  CF2=CF2; C2F4...................       \b\ 0.004
PFC-1216; Dyneon HFP..........................        116-15-4  C3F6; CF3CF=CF2.................        \b\ 0.05
Perfluorobut-2-ene............................        360-89-4  CF3CF=CFCF3.....................        \b\ 1.82
Perfluorobut-1-ene............................        357-26-6  CF3CF2CF=CF2....................        \b\ 0.10
Perfluorobuta-1,3-diene.......................        685-63-2  CF2=CFCF=CF2....................       \b\ 0.003
----------------------------------------------------------------------------------------------------------------
             Non-Cyclic, Unsaturated Hydrofluorocarbons (HFCs) and Hydrochlorofluorocarbons (HCFCs)
----------------------------------------------------------------------------------------------------------------
HFC-1132a; VF2................................         75-38-7  C2H2F2; CF2=CH2.................        \b\ 0.04

[[Page 32922]]

 
HFC-1141; VF..................................         75-02-5  C2H3F; CH2=CHF..................        \b\ 0.02
(E)-HFC-1225ye................................       5595-10-8  CF3CF=CHF(E)....................        \b\ 0.06
(Z)-HFC-1225ye................................       5528-43-8  CF3CF=CHF(Z)....................        \b\ 0.22
Solstice 1233zd(E)............................     102687-65-0  C3H2ClF3; CHCl=CHCF3............        \b\ 1.34
HCFO-1233zd(Z)................................      99728-16-2  (Z)-CF3CH=CHCl..................        \e\ 0.45
HFC-1234yf; HFO-1234yf........................        754-12-1  C3H2F4; CF3CF=CH2...............        \b\ 0.31
HFC-1234ze(E).................................       1645-83-6  C3H2F4; trans-CF3CH=CHF.........        \b\ 0.97
HFC-1234ze(Z).................................      29118-25-0  C3H2F4; cis-CF3CH=CHF; CF3CH=CHF        \b\ 0.29
HFC-1243zf; TFP...............................        677-21-4  C3H3F3; CF3CH=CH2...............        \b\ 0.12
(Z)-HFC-1336..................................        692-49-9  CF3CH=CHCF3(Z)..................        \b\ 1.58
HFO-1336mzz(E)................................      66711-86-2  (E)-CF3CH=CHCF3.................          \e\ 18
HFC-1345zfc...................................        374-27-6  C2F5CH=CH2......................        \b\ 0.09
HFO-1123......................................        359-11-5  CHF=CF2.........................       \e\ 0.005
HFO-1438ezy(E)................................      14149-41-8  (E)-(CF3)2CFCH=CHF..............         \e\ 8.2
HFO-1447fz....................................        355-08-8  CF3(CF2)2CH=CH2.................        \e\ 0.24
Capstone 42-U.................................      19430-93-4  C6H3F9; CF3(CF2)3CH=CH2.........        \b\ 0.16
Capstone 62-U.................................      25291-17-2  C8H3F13; CF3(CF2)5CH=CH2........        \b\ 0.11
Capstone 82-U.................................      21652-58-4  C10H3F17; CF3(CF2)7CH=CH2.......        \b\ 0.09
(e)-1-chloro-2-fluoroethene...................        460-16-2  (E)-CHCl=CHF....................       \e\ 0.004
3,3,3-trifluoro-2-(trifluoromethyl)prop-1-ene.        382-10-5  (CF3)2C=H2......................        \e\ 0.38
----------------------------------------------------------------------------------------------------------------
                                          Non-Cyclic, Unsaturated CFCs
----------------------------------------------------------------------------------------------------------------
CFC-1112......................................        598-88-9  CClF=CClF.......................        \e\ 0.13
CFC-1112a.....................................         79-35-6  CCl2=CF2........................       \e\ 0.021
----------------------------------------------------------------------------------------------------------------
                                   Non-Cyclic, Unsaturated Halogenated Ethers
----------------------------------------------------------------------------------------------------------------
PMVE; HFE-216.................................       1187-93-5  CF3OCF=CF2......................        \b\ 0.17
Fluoroxene....................................        406-90-6  CF3CH2OCH=CH2...................        \b\ 0.05
Methyl-perfluoroheptene-ethers................             N/A  CH3OC7F13.......................          \e\ 15
----------------------------------------------------------------------------------------------------------------
                                   Non-Cyclic, Unsaturated Halogenated Esters
----------------------------------------------------------------------------------------------------------------
Ethenyl 2,2,2-trifluoroacetate................        433-28-3  CF3COOCH=CH2....................       \e\ 0.008
Prop-2-enyl 2,2,2-trifluoroacetate............        383-67-5  CF3COOCH2CH=CH2.................       \e\ 0.007
----------------------------------------------------------------------------------------------------------------
                                        Cyclic, Unsaturated HFCs and PFCs
----------------------------------------------------------------------------------------------------------------
PFC C-1418....................................        559-40-0  c-C5F8..........................           \d\ 2
Hexafluorocyclobutene.........................        697-11-0  cyc (-CF=CFCF2CF2-).............         \e\ 126
1,3,3,4,4,5,5-heptafluorocyclopentene.........       1892-03-1  cyc (-CF2CF2CF2CF=CH-)..........          \e\ 45
1,3,3,4,4-pentafluorocyclobutene..............        374-31-2  cyc (-CH=CFCF2CF2-).............          \e\ 92
3,3,4,4-tetrafluorocyclobutene................       2714-38-7  cyc (-CH=CHCF2CF2-).............          \e\ 26
----------------------------------------------------------------------------------------------------------------
                                              Fluorinated Aldehydes
----------------------------------------------------------------------------------------------------------------
3,3,3-Trifluoro-propanal......................        460-40-2  CF3CH2CHO.......................        \b\ 0.01
----------------------------------------------------------------------------------------------------------------
                                               Fluorinated Ketones
----------------------------------------------------------------------------------------------------------------
Novec 1230 (perfluoro (2-methyl-3-pentanone)).        756-13-8  CF3CF2C(O)CF (CF3)2.............         \b\ 0.1
1,1,1-trifluoropropan-2-one...................        421-50-1  CF3COCH3........................        \e\ 0.09
1,1,1-trifluorobutan-2-one....................        381-88-4  CF3COCH2CH3.....................       \e\ 0.095
----------------------------------------------------------------------------------------------------------------
                                             Fluorotelomer Alcohols
----------------------------------------------------------------------------------------------------------------
3,3,4,4,5,5,6,6,7,7,7-Undecafluoroheptan-1-ol.     185689-57-0  CF3(CF2)4CH2CH2OH...............        \b\ 0.43
3,3,3-Trifluoropropan-1-ol....................       2240-88-2  CF3CH2CH2OH.....................        \b\ 0.35
3,3,4,4,5,5,6,6,7,7,8,8,9,9,9-                        755-02-2  CF3(CF2)6CH2CH2OH...............        \b\ 0.33
 Pentadecafluorononan-1-ol.
3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,11-         87017-97-8  CF3(CF2)8CH2CH2OH...............        \b\ 0.19
 Nonadecafluoroundecan-1-ol.
----------------------------------------------------------------------------------------------------------------
                                   Fluorinated GHGs With Carbon-Iodine Bond(s)
----------------------------------------------------------------------------------------------------------------
Trifluoroiodomethane..........................       2314-97-8  CF3I............................         \b\ 0.4
----------------------------------------------------------------------------------------------------------------
                             Remaining Fluorinated GHGs With Chemical-Specific GWPs
----------------------------------------------------------------------------------------------------------------
Dibromodifluoromethane (Halon 1202)...........         75-61-6  CBR2F2..........................         \b\ 231
2-Bromo-2-chloro-1,1,1-trifluoroethane (Halon-        151-67-7  CHBrClCF3.......................          \b\ 41
 2311/Halothane).
Heptafluoroisobutyronitrile...................      42532-60-5  (CF3)2CFCN......................       \e\ 2,750
Carbonyl fluoride.............................        353-50-4  COF2............................        \e\ 0.14
----------------------------------------------------------------------------------------------------------------

[[Page 32923]]

 
                                                          Global warming
                Fluorinated GHG group \f\                 potential (100
                                                               yr.)
------------------------------------------------------------------------
   Default GWPs for Compounds for Which Chemical-Specific GWPs Are Not
                              Listed Above
------------------------------------------------------------------------
Fully fluorinated GHGs \g\..............................           9,200
Saturated hydrofluorocarbons (HFCs) with 2 or fewer                3,000
 carbon-hydrogen bonds \g\..............................
Saturated HFCs with 3 or more carbon-hydrogen bonds \g\.             840
Saturated hydrofluoroethers (HFEs) and                             6,600
 hydrochlorofluoroethers (HCFEs) with 1 carbon-hydrogen
 bond \g\...............................................
Saturated HFEs and HCFEs with 2 carbon-hydrogen bonds              2,900
 \g\....................................................
Saturated HFEs and HCFEs with 3 or more carbon-hydrogen              320
 bonds \g\..............................................
Saturated chlorofluorocarbons (CFCs) \g\................           4,900
Fluorinated formats.....................................             350
Cyclic forms of the following: unsaturated                            58
 perfluorocarbons (PFCs), unsaturated HFCs, unsaturated
 CFCs, unsaturated hydrochlorofluorocarbons (HCFCs),
 unsaturated bromofluorocarbons (BFCs), unsaturated
 bromochlorofluorocarbons (BCFCs), unsaturated
 hydrobromofluorocarbons (HBFCs), unsaturated
 hydrobromochlorofluorocarbons (HBCFCs), unsaturated
 halogenated ethers, and unsaturated halogenated esters
 \g\....................................................
Fluorinated acetates, carbonofluoridates, and                         25
 fluorinated alcohols other than fluorotelomer alcohols
 \g\....................................................
Fluorinated aldehydes, fluorinated ketones, and non-                   1
 cyclic forms of the following: unsaturated
 perfluorocarbons (PFCs), unsaturated HFCs, unsaturated
 CFCs, unsaturated HCFCs, unsaturated BFCs, unsaturated
 BCFCs, unsaturated HBFCs, unsaturated HBCFCs,
 unsaturated halogenated ethers and unsaturated
 halogenated esters \g\.................................
Fluorotelomer alcohols \g\..............................               1
Fluorinated GHGs with carbon-iodine bond(s) \g\.........               1
Other fluorinated GHGs \g\..............................           1,800
------------------------------------------------------------------------
\a\ The GWP for this compound was updated in the final rule published on
  November 29, 2013 [78 FR 71904] and effective on January 1, 2014.
\b\ This compound was added to Table A-1 in the final rule published on
  December 11, 2014, and effective on January 1, 2015.
\c\ The GWP for this compound was updated in the final rule published on
  December 11, 2014, and effective on January 1, 2015.
\d\ The GWP for this compound was updated in the final rule published on
  [Date of publication of the final rule in the Federal Register] and
  effective on January 1, 2025.
\e\ The GWP for this compound was added to Table A-1 in the final rule
  published on [Date of publication of the final rule in the Federal
  Register] and effective on January 1, 2025.
\f\ For electronics manufacturing (as defined in Sec.   98.90), the term
  ``fluorinated GHGs'' in the definition of each fluorinated GHG group
  in Sec.   98.6 shall include fluorinated heat transfer fluids (as
  defined in Sec.   98.6), whether or not they are also fluorinated
  GHGs.
\g\ The GWP for this fluorinated GHG group was updated in the final rule
  published on [Date of publication of the final rule in the Federal
  Register] and effective on January 1, 2025.

0
7. Amend table A-3 to subpart A of part 98 by adding the entries 
``Additional Source Categories \a\ Applicable in Reporting Year 2025 
and Future Years'', ``Geologic sequestration of carbon dioxide with 
enhanced oil recovery using ISO 27916 (subpart VV).'', ``Coke calciners 
(subpart WW).'', ``Calcium carbide production (subpart XX).'', and 
``Caprolactam, glyoxal, and glyoxylic acid production (subpart YY).'' 
to the end of the table to read as follows.

    Table A-3 to Subpart A of Part 98--Source Category List for Sec.
                               98.2(a)(1)
               Source Category List for Sec.   98.2(a)(1)
------------------------------------------------------------------------
 
-------------------------------------------------------------------------
 
                              * * * * * * *
Additional Source Categories \a\ Applicable in Reporting Year 2025 and
 Future Years:
    Geologic sequestration of carbon dioxide with enhanced oil recovery
     using ISO 27916 (subpart VV).
    Coke calciners (subpart WW).
    Calcium carbide production (subpart XX).
    Caprolactam, glyoxal, and glyoxylic acid production (subpart YY).
------------------------------------------------------------------------
\a\ Source categories are defined in each applicable subpart.

0
8. Amend table A-4 to subpart A of part 98 by adding the entries 
``Additional Source Categories \a\ Applicable in Reporting Year 2025 
and Future Years.'' and ``Ceramics manufacturing facilities, as 
determined under Sec.  98.XXXX (subpart ZZ)'', to the end of the table.

    Table A-4 to Subpart A of Part 98--Source Category List for Sec.
                               98.2(a)(2)
------------------------------------------------------------------------
 
-------------------------------------------------------------------------
 
                              * * * * * * *
Additional Source Categories\a\ Applicable in Reporting Year 2025 and
 Future Years:
    Ceramics manufacturing facilities, as determined under Sec.
     98.XXXX (subpart ZZ)
------------------------------------------------------------------------
\a\ Source categories are defined in each applicable subpart.

0
9. Add subpart B to read as follows:
Subpart B--Energy Consumption
Sec.
98.20 Definition of the source category.
98.21 Reporting threshold.
98.22 GHGs to report.
98.23 Calculating GHG emissions.
98.24 Monitoring and QA/QC requirements.
98.25 Procedures for estimating missing data.
98.26 Data reporting requirements.
98.27 Records that must be retained.
98.28 Definitions.

Sec.  98.20  Definition of the source category.

    (a) The energy consumption source category consists of direct 
emitting facilities that (1) purchase metered electricity or metered 
thermal energy products; (2) are required to report under Sec. Sec.  
98.2(a)(1), (2), or (3) or are

[[Page 32924]]

required to resume reporting under Sec. Sec.  98.2(i)(1), (2), or (3); 
and (3) are not eligible to discontinue reporting under the provisions 
at Sec. Sec.  98.2(i)(1), (2), or (3).
    (b) This source category does not include:
    (1) Purchases of fuel and the associated direct emissions from the 
use of that fuel on site.
    (2) Electricity and thermal energy products that are not subject to 
purchasing agreements.

Sec.  98.21  Reporting threshold.

    You must report the quantity of purchased electricity and thermal 
energy products in accordance with the reporting requirements of Sec.  
98.26 of this subpart.

Sec.  98.22  GHGs to report.

    This subpart does not require the reporting of either direct or 
indirect greenhouse gas emissions.

Sec.  98.23  Calculating GHG emissions.

    This subpart does not require the calculation of either direct or 
indirect greenhouse gas emissions.

Sec.  98.24  Monitoring and QA/QC requirements.

    Facilities subject to this subpart must develop a written Metered 
Energy Monitoring Plan (MEMP) for purchased electricity and thermal 
energy products in accordance with paragraph (a) of this section. The 
MEMP may rely on references to existing corporate documents (e.g., 
purchasing agreements, standard operating procedures, quality assurance 
programs under appendix F to 40 CFR part 60 or appendix B to 40 CFR 
part 75, and other documents) provided that the elements required by 
paragraphs (a)(1) through (7) of this section are easily recognizable. 
Facilities must complete QA/QC requirements in accordance with 
paragraphs (b) and (c) of this section.
    (a) MEMP Requirements. At a minimum, the MEMP must specify 
recordkeeping activities at the same frequency as billing statements 
from the energy delivery service provider and must include the elements 
listed in this paragraph (a).
    (1) Identification of positions of responsibility (i.e., job 
titles) for collection of the energy consumption data.
    (2) The identifier of each meter shown on periodic billing 
statements with a description of the portions of the facility served by 
the meter and a photograph that shows the meter identifier, 
manufacturer's name, and model number.
    (3) For each meter, an indication of the billing frequency (e.g., 
monthly, quarterly, or semi-annually).
    (4) A copy of one typical billing statement that includes all pages 
for each meter with the meter identifier, the name of the energy 
delivery service provider, the name of the energy supply service 
provider (if applicable in deregulated states), the dates of service, 
the usage, and the rate descriptor.
    (5) An indication of whether each electricity meter conforms to the 
accuracy specifications required by Sec.  98.24(b). The MEMP must 
include one of the potential outcomes listed in paragraphs (a)(5)(i) 
through (iii) of this section for each electricity meter serving the 
facility:
    (i) Manufacturer's certification that the electricity meter model 
number conforms to the accuracy specifications required by Sec.  
98.24(b), with a copy of the associated manufacturer's technical data. 
If this option is selected the owner or operator must include a picture 
of the meter with a copy of the technical data from the manufacturer 
indicating conformance to the accuracy specifications required by Sec.  
98.24(b).
    (ii) Certification letter from the electricity delivery service 
provider indicating the meter conforms to the accuracy specifications 
required by Sec.  98.24(b).
    (iii) An indication that either the conformance status of the meter 
to the accuracy specifications required by Sec.  98.24(b) could not be 
determined, or the meter was determined to have accuracy specifications 
less stringent than required by Sec.  98.24(b), according to paragraphs 
(a)(5)(iii)(A) through (C) of this section.
    (A) A copy of the certified letter sent to the electricity delivery 
service provider, requesting installation of a meter that conforms to 
the accuracy specifications required by Sec.  98.24(b).
    (B) The return receipt for the certified letter.
    (C) Any correspondence from the electricity delivery service 
provider related to the request.
    (6) For both purchased electricity and thermal energy product 
meters, an explanation of the processes and methods used to collect the 
necessary data to report the total annual usage of purchased 
electricity in kWh and the total annual usage of purchased thermal 
energy products in mmBtu. For thermal energy products the plan must 
include a clear procedure and example of how measured data are 
converted to mmBtu.
    (7) Description of the procedures and methods that are used for 
quality assurance, maintenance, and repair of all monitoring systems, 
flow meters, and other instrumentation used to collect the energy 
consumption data reported under this part.
    (8) The facility must revise the MEMP as needed to reflect changes 
in production processes, monitoring instrumentation, and quality 
assurance procedures; or to improve procedures for the maintenance and 
repair of monitoring systems to reduce the frequency of monitoring 
equipment downtime.
    (9) Upon request by the Administrator, the facility must make all 
information that is collected in conformance with the MEMP available 
for review. Electronic storage of the information in the plan is 
permissible, provided that the information can be made available in 
hard copy upon request.
    (b) Quality assurance for purchased electricity monitoring. The 
facility must determine if each electricity meter conforms to ANSI 
C12.1-2022: Electric Meters--Code for Electricity Metering 
(incorporated by reference, see Sec.  98.7) or another similar 
consensus standard with accuracy specifications at least as stringent 
as the ANSI standard, using one of the methods under paragraphs (b)(1) 
through (3) of this section.
    (1) The facility may identify the manufacturer and model number of 
the meter and obtain a copy of the meter's technical reference guide or 
technical data sheet indicating the meter's conformance with the 
requirements of Sec.  98.24(b). If this option is selected the facility 
must include a picture of the meter with a copy of the technical data 
from the manufacturer indicating conformance with the requirements of 
Sec.  98.24(b).
    (2) The facility may obtain a certification from the electricity 
delivery service provider that owns the meter indicating that the meter 
conforms to the accuracy specifications required by Sec.  98.24(b).
    (3) If the facility determines that either the conformance status 
of the meter under Sec.  98.24(b) could not be determined, or that the 
meter does not conform to the accuracy specifications required by Sec.  
98.24(b), the facility must submit, via certified mail (with return 
receipt requested) to the electricity delivery service provider that 
owns the meter, a request that the existing meter be replaced by an 
electricity meter that meets the accuracy specifications required by 
Sec.  98.24(b). The facility must maintain in the MEMP a copy of the 
written request, the return receipt, and any correspondence from the 
electricity delivery service provider. Any meters that do not conform 
to the accuracy specifications required by Sec.  98.24(b)

[[Page 32925]]

must be flagged as such in the MEMP, until such time that they are 
replaced with meters that conform to the accuracy specifications 
required by Sec.  98.24(b).
    (c) Quality assurance for purchased thermal energy product 
monitoring. The facility must contact the energy delivery service 
provider of each purchased thermal energy product and request a copy of 
the most recent audit of the accuracy of each meter referenced in the 
purchasing agreement. If an audit of the meter has never been completed 
or if the audit is more than five years old, the facility must request 
that the energy delivery service provider complete an energy audit 
consistent with the terms of the purchasing agreement. If the 
purchasing agreement does not include provisions for periodic audits of 
the meter, the facility must complete an audit of the meter using a 
qualified metering specialist with knowledge of the associated thermal 
medium. Every five years an audit of the meter must be completed. If 
the audit indicates that the meter is producing readings with errors 
greater than specified by Sec.  98.3(i)(2) or (3), the meter must be 
repaired or replaced and retested to demonstrate compliance with the 
specifications at Sec.  98.3(i)(2) or (3).

Sec.  98.25  Procedures for estimating missing data.

    For both purchased electricity and thermal energy products, a 
facility with missing billing statements must request replacement 
copies of the statements from its energy delivery service provider. If 
the energy delivery service provider is unable to provide replacement 
copies of billing statements, the facility must estimate the missing 
data based on the best available estimate of the energy use, based on 
all available data which may impact energy usage (e.g., processing 
rates, operating hours, etc.). The facility must document and keep 
records of the procedures used for all missing data estimates.

Sec.  98.26  Data reporting requirements.

    In addition to the facility-level information required under Sec.  
98.3, the annual GHG report must contain the data specified in 
paragraphs (a) through (m) of this section for each purchased 
electricity and thermal energy product meter located at the facility.
    (a) The state in which each meter is located.
    (b) The locality of the meter. You must report the county in which 
each meter is located. If the meter is not located in a county (e.g., 
meters in Alexandria, Virginia), you must report the city in which the 
meter is located.
    (c) Energy delivery service provider's name (i.e., the name of the 
entity to whom the purchasing facility will send payment).
    (d) An identifying number for the energy delivery service provider 
as specified in paragraph (d)(1) or (2) of this section:
    (1) For purchased electricity, the zip code associated with the 
payment address for the provider.
    (2) For purchased thermal energy products, the public GHGRP 
facility identifier of the energy supply service provider. If the 
provider does not have an assigned GHGRP facility identifier, report 
the zip code for the physical location in which the thermal energy 
product was produced.
    (e) Electricity supply service provider's name. This reporting 
requirement applies only to purchased electricity in states with 
deregulated markets where the electricity billing statements have 
separate line items for electricity delivery services and electricity 
supply services. In these states, the electricity delivery service 
provider may be a different entity from the electricity supply service 
provider.
    (f) Meter number. This is the meter number that appears on each 
billing statement.
    (g) Annual sequence of bill. This is a number from 1 to 12 for 
monthly billing cycles, from 1 to 4 for quarterly billing cycles, and 1 
to 2 for semi-annual billing cycles.
    (h) Start date(s) of period(s) billed. This is the date designating 
when the usage period began for each billing statement. For monthly 
billing cycles, the annual report would include 12 start dates. For 
quarterly billing cycles the annual report would include four start 
dates. For semi-annual billing cycles the annual report would include 
two start dates.
    (i) End date(s) of period(s) billed. This is the date designating 
when the usage period ends for each billing statement. For monthly 
billing cycles, the annual report would include 12 end dates. For 
quarterly billing cycles the annual report would include four end 
dates. For semi-annual billing cycles the annual report would include 
two end dates.
    (j) Quantities of purchased electricity and thermal energy products 
as specified in paragraphs (j)(1) through (3) of this section, 
excluding any quantities described in paragraph (j)(4) of this section.
    (1) Purchased electricity. You must report the kWh used as reported 
on each periodic billing statement received during the reporting year. 
For each meter on each electricity billing statement received during 
the reporting period, the usage will be clearly designated for the 
month, quarter, or semi-annual billing period. This value may be listed 
on the billing statement in megawatt-hours (MWh). To convert values on 
billing statements that report usage in MWh to kWh, the MWh value 
should be multiplied by 1,000.
    (2) Purchased thermal energy products. You must report the quantity 
of thermal energy products purchased as reported on each periodic 
billing statement received during the reporting year, converted to 
mmBtu. This value must be calculated in accordance with the method 
described and documented in the MEMP.
    (3) Allocation. If the periodic billing statement specified in 
paragraph (j)(1) or (2) of this section spans two reporting years, you 
must allocate the quantity of purchased electricity and thermal energy 
products using either the method specified in paragraph (j)(3)(i) or 
(ii) of this section:
    (i) You may allocate the purchased electricity and thermal energy 
products to each reporting year based on operational knowledge of the 
industrial processes for which energy is purchased, or
    (ii) You may allocate to each reporting year the portion of 
purchased electricity and thermal energy products in the periodic 
billing statement proportional to the number of days of service in each 
reporting year.
    (4) Excluded quantities. For the purpose of reporting under this 
paragraph (j), the facility may exclude any electricity that is 
generated outside the facility and delivered into the facility with 
final destination and usage outside of the facility. The facility may 
also exclude electricity consumed by operations or activities that do 
not support any activities reporting direct emissions in this part. The 
excluded quantities may be estimated based on company records or 
engineering judgment.
    (k) Rate descriptor for each electricity billing statement. Each 
electricity billing statement should have a statement that describes 
the rate plan in effect for the billing location. This rate descriptor 
can indicate if the customer is billed based on a time-of-use rate or 
if the customer is purchasing a renewable energy product. For example, 
a typical rate statement could be ``Your current rate is Large 
Commercial Time of Use (LC-TOUD).'' In this case the GHGRP reporter 
would enter ``LC-TOUD'' as the rate descriptor for the associated 
billing period.

[[Page 32926]]

    (l) Facilities subject to multiple direct emitting part 98 subparts 
must report, for the quantities reported under paragraph (j) of this 
section, the decimal fraction of purchased electricity or thermal 
energy products attributable to each subpart. The fraction may be 
estimated based on company records or engineering judgment.
    (m) Copy of one billing statement per energy delivery service 
provider of purchased electricity or thermal energy products, as 
specified in paragraphs (m)(1) through (3) of this section.
    (1) The first annual report under this subpart must include an 
electronic copy of all pages of one billing statement received by the 
facility from each energy delivery service provider of purchased 
electricity or thermal energy products.
    (2) If the facility changes or adds one or more energy delivery 
service providers after the first reporting year, the annual report 
must include an electronic copy of all pages of one billing statement 
received from each new energy delivery service provider for only the 
first reporting year of each new purchasing agreement.
    (3) The electronic copy specified in paragraph (m)(2) of this 
section must be submitted in the format specified in the reporting 
instructions published for the reporting year.

Sec.  98.27  Records that must be retained.

    (a) Copies of all purchased electricity or thermal energy product 
billing statements.
    (b) The results of all required certification and quality assurance 
tests referenced in the MEMP for all purchased electricity or thermal 
energy product meters used to develop the energy consumption data 
reported under this part.
    (c) Maintenance records for all monitoring systems, flow meters, 
and other instrumentation used to provide data on consumption of 
purchased electricity or thermal energy products under this part.

Sec.  98.28  Definitions.

    Except as provided in this section, all terms used in this part 
shall have the same meaning given in the Clean Air Act and subpart A of 
this part.
    Indirect emissions are an attribute of activities that consume 
energy and are intended to provide an estimate of the quantity of 
greenhouse gases associated with the production and delivery of 
purchased electricity and thermal energy products delivered to the 
energy consumer. Indirect emissions are released to the atmosphere at a 
facility that is owned by the energy supply service provider, but the 
indirect emissions attribute is associated with the consuming activity.
    Metered means, as applied to electricity, that the quantity of 
electricity is determined by an electricity meter installed at the 
location of service by an electricity delivery service provider who 
periodically conducts meter readings for billing purposes. As applied 
to thermal energy products, metered means that the thermal energy 
product is metered in accordance with the purchasing agreement with 
additional information, as necessary, such as design or operating 
temperature, pressure, and mass flow rate to determine the supplied 
quantity of thermal energy products.
    Purchased electricity means metered electricity that is delivered 
to a facility subject to this subpart.
    Purchasing agreement means, for purchased electricity, the terms 
and conditions governing the provision of electric services by an 
electricity delivery service provider to a consumer seeking electric 
service (i.e., the applicable part 98 source). For purchased thermal 
energy products, this term means a contract, such as a steam purchase 
contract, between a supplier of thermal energy products and a consumer 
of thermal energy products (i.e., the applicable part 98 source). 
Purchasing agreements include specific provisions for metering the 
purchased electricity or thermal energy products.
    Thermal energy products means metered steam, hot water, hot oil, 
chilled water, refrigerant, or any other medium used to transfer 
thermal energy and delivered to a facility subject to this subpart.

Subpart C--General Stationary Fuel Combustion Sources

0
10. Amend Sec.  98.36 by adding paragraphs (b)(12), (c)(1)(xii), 
(c)(2)(xii), and (c)(3)(xi) to read as follows:

Sec.  98.36  Data reporting requirements.

* * * * *
    (b) * * *
    (12) An indication of whether the unit is an electricity generating 
unit.
    (c) * * *
    (1) * * *
    (xii) An indication of whether any unit in the group is an 
electricity generating unit, and, if so, an estimate of the group's 
total reported emissions attributable to electricity generation 
(expressed as a decimal fraction). This estimate may be based on 
engineering estimates.
    (2) * * *
    (xii) An indication of whether any unit in the group is an 
electricity generating unit, and, if so, an estimate of the group's 
total reported emissions attributable to electricity generation 
(expressed as a decimal fraction). This estimate may be based on 
engineering estimates.
    (3) * * *
    (xii) An indication of whether any unit in the group is an 
electricity generating unit, and, if so, an estimate of the group's 
total reported emissions attributable to electricity generation 
(expressed as a decimal fraction). This estimate may be based on 
engineering estimates.
* * * * *

Subpart F--Aluminum Production

0
11. Amend Sec.  98.66 by revising paragraphs (a) and (g) to read as 
follows:

Sec.  98.66  Data reporting requirements.

* * * * *
    (a) Annual production capacity (tons).
* * * * *
    (g) Annual operating days per potline.
* * * * *

Subpart G--Ammonia Manufacturing

0
12. Amend Sec.  98.76 by adding paragraph (b)(16) to read as follows:

Sec.  98.76  Data reporting requirements.

* * * * *
    (b) * * *
    (16) Annual quantity of excess hydrogen produced that is not 
consumed through the production of ammonia (metric tons).

Subpart I--Electronics Manufacturing

Sec.  98.98  [Amended]

0
13. Amend Sec.  98.98 by removing the definition for ``Fluorinated heat 
transfer fluids.''
0
14. Revise table I-16 of subpart I of part 98 to read as follows:

[[Page 32927]]

   Table I-16 to Subpart I of Part 98--Default Emission Destruction or
     Removal Efficiency (DRE) Factors for Electronics Manufacturing
------------------------------------------------------------------------
         Manufacturing type/process type/gas            Default DRE  (%)
------------------------------------------------------------------------
MEMS, LCDs, and PV manufacturing.....................                 60
Semiconductor Manufacturing..........................  .................
CF4..................................................                 87
CH3F.................................................                 98
CHF3.................................................                 97
CH2F2................................................                 98
C4F8.................................................                 93
C4F8O................................................                 93
C5F8.................................................                 97
C4F6.................................................                 95
C3F8.................................................                 98
C2HF5................................................                 97
C2F6.................................................                 98
SF6..................................................                 95
NF3..................................................                 96
All other carbon-based fluorinated GHGs used in                       60
 Semiconductor Manufacturing.........................
N2O Processes........................................  .................
CVD and all other N2O-using processes................                 60
------------------------------------------------------------------------

0
15. Revise table I-18 of subpart I of part 98 to read as follows:

     Table I-18 to Subpart I of Part 98--Default Factors for Gamma ([gamma]i,p and [gamma]k,i,p) for Semiconductor Manufacturing and for MEMS and PV
                                     Manufacturing Under Certain Conditions * for Use With the Stack Testing Method
--------------------------------------------------------------------------------------------------------------------------------------------------------
                      Process type                                In-situ thermal or in-situ plasma cleaning                Remote plasma cleaning
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                     c-C4F8
                          Gas                               CF4         C2F6                       NF3        SF6         C3F8         CF4        NF3
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                 If manufacturing wafer sizes <=200 mm AND manufacturing 300 mm (or greater) wafer sizes
--------------------------------------------------------------------------------------------------------------------------------------------------------
[gamma]i...............................................         13          9.3           4.7          14         11           NA          NA        5.7
[gamma]CF4,i...........................................         NA           23           6.7          63        8.7           NA          NA         58
[gamma]C2F6,i..........................................         NA           NA            NA          NA        3.4           NA          NA         NA
[gamma]CHF3,i..........................................         NA           NA            NA          NA         NA           NA          NA       0.24
[gamma]CH2F2,i.........................................         NA           NA            NA          NA         NA           NA          NA        111
[gamma]CH3F,i..........................................         NA           NA            NA          NA         NA           NA          NA         33
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                       If manufacturing <=200 mm OR manufacturing 300 mm (or greater) wafer sizes
--------------------------------------------------------------------------------------------------------------------------------------------------------
[gamma]i (<=200 mm wafer size).........................         13          9.3           4.7         2.9         11           NA          NA        1.4
[gamma]CF4,i (<=200 mm wafer size).....................         NA           23           6.7         110        8.7           NA          NA         36
[gamma]C2F6,i (<=200 mm wafer size)....................         NA           NA            NA          NA        3.4           NA          NA         NA
[gamma]i (300 mm wafer size)...........................         NA           NA            NA          26         NA           NA          NA         10
[gamma]CF4,i (300 mm wafer size).......................         NA           NA            NA          17         NA           NA          NA         80
[gamma]C2F6,i (300 mm wafer size)......................         NA           NA            NA          NA         NA           NA          NA         NA
[gamma]CHF3,i (300 mm wafer size)......................         NA           NA            NA          NA         NA           NA          NA       0.24
[gamma]CH2F2,i (300 mm wafer size).....................         NA           NA            NA          NA         NA           NA          NA        111
[gamma]CH3F,i (300 mm wafer size)......................         NA           NA            NA          NA         NA           NA          NA         33
--------------------------------------------------------------------------------------------------------------------------------------------------------
* If you manufacture MEMS or PVs and use semiconductor tools and processes, you may use the corresponding [gamma] in this table. For all other tools and
  processes, a default [gamma] of 10 must be used.

Subpart N--Glass Production

0
16. Amend Sec.  98.146 by:
0
a. Revising paragraphs (a) introductory text and (a)(1);
0
b. Adding paragraph (a)(3); and
0
c. Revising paragraphs (b)(4) and (9).
    The revisions and additions read as follows:

Sec.  98.146  Data reporting requirements.

* * * * *
    (a) If a CEMS is used to measure CO2 emissions, then you 
must report under this subpart the relevant information required under 
Sec.  98.36 for the Tier 4 Calculation Methodology and the following 
information specified in paragraphs (a)(1) through (3) of this section:
    (1) Annual quantity of each carbonate-based raw material (tons) 
charged to each continuous glass melting furnace and for all furnaces 
combined.
* * * * *
    (3) Annual quantity (tons), by glass type, of recycled scrap glass 
(cullet) charged to each glass melting furnace and for all furnaces 
combined.
    (b) * * *
    (4) Annual quantity (tons), by glass type, of recycled scrap glass 
(cullet)

[[Page 32928]]

charged to each glass melting furnace and for all furnaces combined.
* * * * *
    (9) The number of times in the reporting year that missing data 
procedures were followed to measure monthly quantities of carbonate-
based raw materials, recycled scrap glass (cullet), or mass fraction of 
the carbonate-based minerals for any continuous glass melting furnace 
(months).
0
17. Amend Sec.  98.147 by:
0
a. Revising paragraph (a) introductory text;
0
b. Adding paragraph (a)(3);
0
c. Revising paragraphs (b) introductory text and (b)(1) and (2);
0
d. Redesignating paragraphs (b)(3) through (5) as paragraphs (b)(4) 
through (6), respectively; and
0
e. Adding new paragraph (b)(3).
    The revisions and additions read as follows:

Sec.  98.147  Records that must be retained.

* * * * *
    (a) If a CEMS is used to measure emissions, then you must retain 
the records required under Sec.  98.37 for the Tier 4 Calculation 
Methodology and the following information specified in paragraphs 
(a)(1) through (a)(3) of this section:
* * * * *
    (3) Monthly amount (tons) of recycled scrap glass (cullet) charged 
to each glass melting furnace, by glass type.
    (b) If process CO2 emissions are calculated according to 
the procedures specified in Sec.  98.143(b), you must retain the 
records in paragraphs (b)(1) through (b)(6) of this section.
    (1) Monthly glass production rate for each continuous glass melting 
furnace, by glass type (tons).
    (2) Monthly amount of each carbonate-based raw material charged to 
each continuous glass melting furnace (tons).
    (3) Monthly amount (tons) of recycled scrap glass (cullet) charged 
to each glass melting furnace, by glass type.
    (4) Data on carbonate-based mineral mass fractions provided by the 
raw material supplier for all raw materials consumed annually and 
included in calculating process emissions in Equation N-1 of this 
subpart, if applicable.
    (5) Results of all tests, if applicable, used to verify the 
carbonate-based mineral mass fraction for each carbonate-based raw 
material charged to a continuous glass melting furnace, including the 
data specified in paragraphs (b)(5)(i) through (v) of this section.
    (i) Date of test.
    (ii) Method(s), and any variations of the methods, used in the 
analyses.
    (iii) Mass fraction of each sample analyzed.
    (iv) Relevant calibration data for the instrument(s) used in the 
analyses.
    (v) Name and address of laboratory that conducted the tests.
    (6) The decimal fraction of calcination achieved for each 
carbonate-based raw material, if a value other than 1.0 is used to 
calculate process mass emissions of CO2.
* * * * *

Subpart P--Hydrogen Production

0
18. Revise Sec.  98.160 to read as follows:

Sec.  98.160  Definition of the source category.

    (a) A hydrogen production source category consists of facilities 
that produce hydrogen gas as a product.
    (b) This source category comprises process units that produce 
hydrogen by reforming, gasification, oxidation, reaction, or other 
transformations of feedstocks except the processes listed in paragraph 
(b)(1) or (2) of this section.
    (1) Any process unit for which emissions are reported under another 
subpart of this part. This includes, but is not necessarily limited to:
    (A) Ammonia production units for which emissions are reported under 
subpart G.
    (B) Catalytic reforming units at petroleum refineries that 
transform naphtha into higher octane aromatics for which emissions are 
reported under subpart Y.
    (C) Petrochemical process units for which emissions are reported 
under subpart X.
    (2) Any process unit that only separates out diatomic hydrogen from 
a gaseous mixture and is not associated with a unit that produces 
hydrogen created by transformation of one or more feedstocks, other 
than those listed in paragraph (b)(1) of this section.
    (c) This source category includes the process units that produce 
hydrogen and stationary combustion units directly associated with 
hydrogen production (e.g., reforming furnace and hydrogen production 
process unit heater).
0
19. Amend Sec.  98.162 by revising paragraph (a) to read as follows:

Sec.  98.162  GHGs to report.

* * * * *
    (a) CO2 emissions from each hydrogen production process 
unit, including fuel combustion emissions accounted for in the 
calculation methodologies in Sec.  98.163.
* * * * *
0
20. Amend Sec.  98.163 by revising paragraph (c) to read as follows:

Sec.  98.163  Calculating GHG emissions.

* * * * *
    (c) If GHG emissions from a hydrogen production process unit are 
vented through the same stack as any combustion unit or process 
equipment that reports CO2 emissions using a CEMS that 
complies with the Tier 4 Calculation Methodology in subpart C of this 
part (General Stationary Fuel Combustion Sources), then the owner or 
operator shall report under this subpart the combined stack emissions 
according to the Tier 4 Calculation Methodology in Sec.  98.33(a)(4) 
and all associated requirements for Tier 4 in subpart C of this part 
(General Stationary Fuel Combustion Sources). If GHG emissions from a 
hydrogen production process unit using a CEMS that complies with the 
Tier 4 Calculation Methodology in subpart C of this part (General 
Stationary Fuel Combustion Sources) does not include combustion 
emissions from the hydrogen production unit (i.e., the hydrogen 
production unit has separate stacks for process and combustion 
emissions), then the calculation methodology in paragraph (b) of this 
section shall be used considering only fuel inputs to calculate and 
report CO2 emissions from fuel combustion related to the 
hydrogen production unit.
0
21. Revise Sec.  98.166 to read as follows:

Sec.  98.166  Data reporting requirements.

    In addition to the information required by Sec.  98.3(c), each 
annual report must contain the information specified in paragraphs (a) 
and (b) of this section, as appropriate.
    (a) If a CEMS is used to measure CO2 emissions, then you 
must report the relevant information required under Sec.  98.36 for the 
Tier 4 Calculation Methodology for each CEMS monitoring location.
    (b) For each hydrogen production process unit, report:
    (1) Unit identification number and the information about the unit 
specified in paragraphs (b)(1)(i) and (ii) of this section:
    (i) The type of hydrogen production unit (steam methane reformer 
(SMR) only, SMR followed by water gas shift reaction (WGS), partial 
oxidation (POX) only, POX followed by WGS, water electrolysis, brine 
electrolysis, other (specify)); and,
    (ii) The type of hydrogen purification method (pressure swing 
adsorption, amine adsorption, membrane separation, other (specify), 
none).

[[Page 32929]]

    (2) Annual CO2 emissions (metric tons) and the 
calculation methodology (CEMS for single hydrogen production unit; CEMS 
on a common stack for multiple hydrogen production units; CEMS on a 
common stack with hydrogen production unit(s) and other sources; CEMS 
measuring only process emissions plus fuel combustion emissions 
calculated using Equations P-1 through P-3; material balance using 
Equations P-1 through P-3 only; material balance using Equations P-1 
through P-4).
    (i) If either a CEMS on a common stack for multiple hydrogen 
production units or CEMS on a common stack for hydrogen production 
unit(s) and other sources is used, you must also report the estimated 
decimal fraction of the total annual CO2 emissions from the 
CEMS monitoring location (estimated using engineering estimates or best 
available data) attributable to this hydrogen production unit.
    (ii) If the method selected is CEMS measuring process emissions 
alone plus mass balance for hydrogen production unit fuel combustion 
using Equations P-1 through P-3, you must also report the annual 
CO2 emissions (metric tons) calculated for this hydrogen 
production unit's fuel combustion using Equations P-1 through P-3.
    (3) The following quantities of hydrogen exiting the hydrogen 
production unit:
    (i) Annual quantity of hydrogen produced by reforming, 
gasification, oxidation, reaction, or other transformation of 
feedstocks (metric tons).
    (ii) Annual quantity of hydrogen that is purified only (metric 
tons). This quantity may be assumed to be equal to the annual quantity 
of hydrogen in the feedstocks to the hydrogen production unit.
    (4) Annual quantity of ammonia intentionally produced as a desired 
product, if applicable (metric tons).
    (5) If a material balance method is used, name and annual quantity 
(metric tons) of each carbon-containing fuel and feedstock.
    (6) Quantity of CO2 collected and transferred off site 
in either gas, liquid, or solid forms, following the requirements of 
subpart PP of this part.
    (7) Annual quantity of carbon other than CO2 or methanol 
collected and transferred off site in either gas, liquid, or solid 
forms (metric tons carbon).
    (8) Annual quantity of methanol intentionally produced as a desired 
product, if applicable, (metric tons) for each process unit.
    (9) Annual net quantity of steam consumed by the unit, (metric 
tons). Include steam purchased or produced outside of the hydrogen 
production unit. If the hydrogen production unit is a net producer of 
steam, enter the annual net quantity of steam consumed by the unit as a 
negative value.
0
22. Amend Sec.  98.167 by revising paragraph (b), removing and 
reserving paragraph (c), and revising paragraph (d).

Sec.  98.167  Records that must be retained.

* * * * *
    (b) You must retain records of all analyses and calculations 
conducted to determine the values reported in Sec.  98.166(b).
    (c) [Reserved]
    (d) The owner or operator must document the procedures used to 
ensure the accuracy of the estimates of fuel and feedstock usage in 
Sec.  98.163(b), including, but not limited to, calibration of weighing 
equipment, fuel and feedstock flow meters, and other measurement 
devices. The estimated accuracy of measurements made with these devices 
must also be recorded, and the technical basis for these estimates must 
be provided.
* * * * *

Subpart Y--Petroleum Refineries

0
23. Amend Sec.  98.250 by revising paragraph (c) to read as follows:

Sec.  98.250  Definition of source category.

* * * * *
    (c) This source category consists of the following sources at 
petroleum refineries: Catalytic cracking units; fluid coking units; 
delayed coking units; catalytic reforming units; asphalt blowing 
operations; blowdown systems; storage tanks; process equipment 
components (compressors, pumps, valves, pressure relief devices, 
flanges, and connectors) in gas service; marine vessel, barge, tanker 
truck, and similar loading operations; flares; and sulfur recovery 
plants.

Sec.  98.252  [Amended]

0
24. Amend Sec.  98.252 by removing and reserving paragraphs (e) and 
(i).
0
25. Amend Sec.  98.253 by:
0
a. Revising parameter ``CO2'' of Equation Y-9 in paragraph 
(c)(4) and parameter ``CO2'' of Equation Y-10 in paragraph 
(c)(5); and
0
b. Removing and reserving paragraph (g).
    The revisions read as follows:

Sec.  98.253  Calculating GHG emissions.

* * * * *
    (c) * * *
    (4) * * *

CO2 = Emission rate of CO2 from coke burn-off 
calculated in paragraphs (c)(1), (c)(2), (e)(1), or (e)(2) of this 
section, as applicable (metric tons/year).
* * * * *
    (5) * * *

CO2 = Emission rate of CO2 from coke burn-off 
calculated in paragraphs (c)(1), (c)(2), (e)(1), or (e)(2) of this 
section, as applicable (metric tons/year).
* * * * *
    (g) [Removed and Reserved]

Sec.  98.254  [Amended]

0
26. Amend Sec.  98.254 by removing and reserving paragraphs (h) and 
(i).

Sec.  98.255  [Amended]

0
27. Amend Sec.  98.255 by removing and reserving paragraph (d).
0
28. Amend Sec.  98.256 by:
0
a. Removing and reserving paragraphs (b) and (i); and
0
b. Revising paragraph (j)(2).
    The revisions read as follows:

Sec.  98.256  Data reporting requirements.

* * * * *
    (b) [Removed and Reserved]
* * * * *
    (i) [Removed and Reserved]
* * * * *
    (j) * * *
    (2) Maximum rated throughput of the unit, in metric tons asphalt/
stream day.
* * * * *
0
29. Amend Sec.  98.257 by:
0
a. Revising paragraphs (b)(16) through (19); and
0
b. Removing and reserving paragraphs (b)(27) through (31).
    The revisions read as follows:

Sec.  98.257  Records that must be retained.

* * * * *
    (b) * * *
    (16) Value of unit-specific CH4 emission factor, 
including the units of measure, for each catalytic cracking unit, 
traditional fluid coking unit, and catalytic reforming unit 
(calculation method in Sec.  98.253(c)(4)).
    (17) Annual activity data (e.g., input or product rate), including 
the units of measure, in units of measure consistent with the emission 
factor, for each catalytic cracking unit, traditional fluid coking 
unit, and catalytic reforming unit (calculation method in Sec.  
98.253(c)(4)).
    (18) Value of unit-specific N2O emission factor, 
including the units of measure, for each catalytic cracking unit, 
traditional fluid coking unit, and catalytic reforming unit 
(calculation method in Sec.  98.253(c)(5)).
    (19) Annual activity data (e.g., input or product rate), including 
the units of

[[Page 32930]]

measure, in units of measure consistent with the emission factor, for 
each catalytic cracking unit, traditional fluid coking unit, and 
catalytic reforming unit (calculation method in Sec.  98.253(c)(5)).
* * * * *
    (27) [Removed and Reserved]
    (28) [Removed and Reserved]
    (29) [Removed and Reserved]
    (30) [Removed and Reserved]
    (31) [Removed and Reserved]
* * * * *

Subpart AA--Pulp and Paper Manufacturing

0
30. Amend Sec.  98.273 by:
0
a. Revising introductory paragraph (a) and paragraphs (a)(1) and (2);
0
b. Adding paragraph (a)(4);
0
c. Revising introductory paragraph (b) and paragraphs (b)(1) and (2);
0
d. Adding paragraph (b)(5);
0
e. Revising introductory paragraph (c) and paragraphs (c)(1) and (2); 
and
0
f. Adding paragraph (c)(4).
    The revisions and additions read as follows:

Sec.  98.273  Calculating GHG emissions.

    (a) For each chemical recovery furnace located at a kraft or soda 
facility, you must determine CO2, biogenic CO2, 
CH4, and N2O emissions using the procedures in 
paragraphs (a)(1) through (a)(4) of this section. CH4 and 
N2O emissions must be calculated as the sum of emissions 
from combustion of fuels and combustion of biomass in spent liquor 
solids.
    (1) Calculate CO2 emissions from fuel combustion using 
direct measurement of fuels consumed and default emissions factors 
according to the Tier 1 methodology for stationary combustion sources 
in Sec.  98.33(a)(1). Tiers 2 or 3 from Sec.  98.33(a)(2) or (3) may be 
used to calculate CO2 emissions if the respective monitoring 
and QA/QC requirements described in Sec.  98.34 are met.
    (2) Calculate CH4 and N2O emissions from fuel 
combustion using direct measurement of fuels consumed, default or site-
specific HHV, and default emissions factors and convert to metric tons 
of CO2 equivalent according to the methodology for 
stationary combustion sources in Sec.  98.33(c).
* * * * *
    (4) Calculate biogenic CO2 emissions from combustion of 
biomass (other than spent liquor solids) with other fuels according to 
the applicable methodology for stationary combustion sources in Sec.  
98.33(e).
    (b) For each chemical recovery combustion unit located at a sulfite 
or stand-alone semichemical facility, you must determine 
CO2, CH4, and N2O emissions using the 
procedures in paragraphs (b)(1) through (5) of this section:
    (1) Calculate CO2 emissions from fuel combustion using 
direct measurement of fuels consumed and default emissions factors 
according to the Tier 1 Calculation Methodology for stationary 
combustion sources in Sec.  98.33(a)(1). Tiers 2 or 3 from Sec.  
98.33(a)(2) or (3) may be used to calculate CO2 emissions if 
the respective monitoring and QA/QC requirements described in Sec.  
98.34 are met.
    (2) Calculate CH4 and N2O emissions from fuel 
combustion using direct measurement of fuels consumed, default or site-
specific HHV, and default emissions factors and convert to metric tons 
of CO2 equivalent according to the methodology for 
stationary combustion sources in Sec.  98.33(c).
* * * * *
    (5) Calculate biogenic CO2 emissions from combustion of 
biomass (other than spent liquor solids) with other fuels according to 
the applicable methodology for stationary combustion sources in Sec.  
98.33(e).
    (c) For each pulp mill lime kiln located at a kraft or soda 
facility, you must determine CO2, CH4, and 
N2O emissions using the procedures in paragraphs (c)(1) 
through (c)(4) of this section:
    (1) Calculate CO2 emissions from fuel combustion using 
direct measurement of fuels consumed and default HHV and default 
emissions factors, according to the Tier 1 Calculation Methodology for 
stationary combustion sources in Sec.  98.33(a)(1). Tiers 2 or 3 from 
Sec.  98.33(a)(2) or (3) may be used to calculate CO2 
emissions if the respective monitoring and QA/QC requirements described 
in Sec.  98.34 are met.
    (2) Calculate CH4 and N2O emissions from fuel 
combustion using direct measurement of fuels consumed, default or site-
specific HHV, and default emissions factors and convert to metric tons 
of CO2 equivalent according to the methodology for 
stationary combustion sources in Sec.  98.33(c); use the default HHV 
listed in Table C-1 of subpart C and the default CH4 and 
N2O emissions factors listed in Table AA-2 of this subpart.
* * * * *
    (4) Calculate biogenic CO2 emissions from combustion of 
biomass with other fuels according to the applicable methodology for 
stationary combustion sources in Sec.  98.33(e).
* * * * *
0
31. Amend Sec.  98.276 by revising paragraph (a) to read as follows:

Sec.  98.276  Data reporting requirements.

* * * * *
    (a) Annual emissions of CO2, biogenic CO2, 
CH4, and N2O (metric tons per year).
* * * * *
0
32. Amend Sec.  98.277 by revising paragraph (d) to read as follows:

Sec.  98.277  Records that must be retained.

* * * * *
    (d) Annual quantity of spent liquor solids combusted in each 
chemical recovery furnace and chemical recovery combustion unit, and 
the basis for determining the annual quantity of the spent liquor 
solids combusted (whether based on T650 om-05 Solids Content of Black 
Liquor, TAPPI (incorporated by reference, see Sec.  98.7) or an online 
measurement system). If an online measurement system is used, you must 
retain records of the calculations used to determine the annual 
quantity of spent liquor solids combusted from the continuous 
measurements.
* * * * *

Subpart HH--Municipal Solid Waste Landfills

0
33. Amend Sec.  98.343 by:
0
a. Revising paragraph (c) introductory text;
0
b. Revising Equation HH-6 in paragraph (c)(3)(i);
0
c. Adding parameters ``M,'' ``0.0026,'' ``dm,'' and 
``Sm'' to Equation HH-6 in paragraph (c)(3)(i);
0
d. Revising parameters ``Rn'' and ``fDest,n'' to 
Equation HH-6 in paragraph (c)(3)(i);
0
e. Revising Equations HH-7 and HH-8 in paragraph (c)(3)(ii);
0
f. Removing parameter ``fRec,n'' to Equations HH-7 and HH-8 
in paragraph (c)(3)(ii);
0
g. Adding parameters ``C,'' ``X,'' ``Rx,c,'' 
``fRec,c,'' ``M,'' ``0.0026,'' ``dm,'' and 
``Sm'' to Equation HH-7 in paragraph (c)(3)(ii);
0
h. Revising parameter ``CE'' to Equation HH-7 in paragraph (c)(3)(ii);
0
i. Adding parameters ``C,'' ``X,'' ``Rx,c,'' and 
``fRec,c'' to Equation HH-8 in paragraph (c)(3)(ii);
0
j. Revising parameters ``N'' and ``fDest,n'' to Equation HH-
8 in paragraph (c)(3)(ii); and
0
k. Adding paragraph (c)(4).
    The revisions read as follows:

Sec.  98.343  Calculating GHG emissions.

* * * * *
    (c) For all landfills, calculate CH4 generation 
(adjusted for oxidation in cover materials) and actual CH4 
emissions (taking into account any CH4 recovery, and 
oxidation in cover

[[Page 32931]]

materials) according to the applicable methods in paragraphs (c)(1) 
through (4) of this section.
* * * * *
    (3) * * *
    (i) * * *
    [GRAPHIC] [TIFF OMITTED] TP22MY23.006
    
* * * * *
Rn = Quantity of recovered CH4 from Equation 
HH-4 of this section for the nth measurement location (metric tons 
CH4).
* * * * *
M = Number of individual surface measurements that exceed 500 parts 
per million (ppm) above background in the reporting year. If surface 
monitoring is not performed or no measurement exceeded 500 ppm above 
background in the reporting year, assume M = 0.
0.0000284 = Correlation factor (metric tons methane per ppm surface 
concentration per day).
dm = Leak duration (days), estimated as the number of 
days since the last monitoring event at the specified location from 
company records. Alternatively, you may use the following defaults 
for d: 10 days for 10-day monitoring events; 30 days for monthly 
monitoring, 91 days for quarterly monitoring, and 365 days for 
annual monitoring.
Sm = Surface measurement methane concentration for the 
mth measurement that exceeds 500 parts per million above background 
(parts per million by volume).
* * * * *
fDest,n = Fraction of hours the destruction device 
associated with the nth measurement location was operating during 
active gas flow calculated as the annual operating hours for the 
destruction device divided by the annual hours flow was sent to the 
destruction device as measured at the nth measurement location. The 
annual operating hours for the destruction device should include 
only those periods when flow was sent to the destruction device and 
the destruction device was operating at its intended temperature or 
other parameter indicative of effective operation. For flares, times 
when there is no pilot flame present must be excluded from the 
annual operating hours for the destruction device. If the gas is 
transported off-site for destruction, use fDest,n= 1. If 
the volumetric flow and CH4 concentration of the 
recovered gas is measured at a single location providing landfill 
gas to multiple destruction devices (including some gas destroyed 
on-site and some gas sent off-site for destruction), calculate 
fDest,n as the arithmetic average of the fDest 
values determined for each destruction device associated with that 
measurement location.

    (ii) * * *
    [GRAPHIC] [TIFF OMITTED] TP22MY23.007
    
    [GRAPHIC] [TIFF OMITTED] TP22MY23.008
    
* * * * *
C = Number of landfill gas collection systems operated at the 
landfill.
X = Number of landfill gas measurement locations associated with 
landfill gas collection system ``c''.
N = Number of landfill gas measurement locations (associated with a 
destruction device or gas sent off-site). If a single monitoring 
location is used to monitor volumetric flow and CH4 
concentration of the recovered gas sent to one or multiple 
destruction devices, then N = 1. Note that N = [Sigma]Cc=1 
[[Sigma]Xx=1[1]].
Rx,c = Quantity of recovered CH4 from Equation 
HH-4 of this section for the xth measurement location for landfill 
gas collection system ``c'' (metric tons CH4).
* * * * *
CE = Collection efficiency estimated at landfill, taking into 
account system coverage, operation, measurement practices, and cover 
system materials from Table HH-3 of this subpart. If area by soil 
cover type information is not available, use applicable default 
value for CE4 in Table HH-3 of this subpart for all areas under 
active influence of the collection system.
* * * * *
fRec,c = Fraction of hours the landfill gas collection 
system ``c'' was operating normally (annual operating hours/8760 
hours per year or annual operating hours/8784 hours per year for a 
leap year). Do not include periods of shut down or poor operation, 
such as times when pressure, temperature, or other parameters 
indicative of operation are outside of normal variances, in the 
annual operating hours.
* * * * *
M = Number of individual surface measurements that exceed 500 parts 
per million (ppm) above background in the reporting year. If surface 
monitoring is not performed or no measurement exceeded 500 ppm above 
background in the reporting year, assume M = 0.
0.0000284 = Correlation factor (metric tons methane per ppm surface 
concentration per day)
dm = Leak duration (days), estimated as the number of 
days since the last monitoring event at the specified location from 
company records. Alternatively, you may use the following defaults 
for d: 10 days for 10-day monitoring events; 30 days for monthly 
monitoring, 91 days for quarterly monitoring, and 365 days for 
annual monitoring.
Sm = Surface measurement methane concentration for the 
mth measurement that exceeds 500 parts per million above background 
(parts per million by volume).
* * * * *
fDest,n = Fraction of hours the destruction device 
associated with the nth measurement location was operating during 
active gas flow calculated as the annual operating hours for the 
destruction device divided by the annual hours flow was sent to the 
destruction

[[Page 32932]]

device as measured at the nth measurement location. The annual 
operating hours for the destruction device should include only those 
periods when flow was sent to the destruction device and the 
destruction device was operating at its intended temperature or 
other parameter indicative of effective operation. For flares, times 
when there is no pilot flame present must be excluded from the 
annual operating hours for the destruction device. If the gas is 
transported off-site for destruction, use fDest,n= 1. If 
the volumetric flow and CH4 concentration of the 
recovered gas is measured at a single location providing landfill 
gas to multiple destruction devices (including some gas destroyed 
on-site and some gas sent off-site for destruction), calculate 
fDest,n as the arithmetic average of the fDest 
values determined for each destruction device associated with that 
measurement location.

    (4) For landfills with landfill gas collection systems, you must 
comply with the applicable requirements in paragraphs (c)(4)(i) through 
(iii) of this section when calculating the emissions in paragraph 
(c)(3) of this section.
    (i) For landfills with landfill gas collection systems required to 
conduct surface methane concentration measurements according to 40 CFR 
part 60, subparts Cc, Cf, WWW or XXX or according to 40 CFR part 62, 
subpart GGG or OOO, you must use the method for conducting surface 
methane concentration measurements in Sec.  98.344(g) of this subpart 
as applicable to your landfill, you must account for each exceedance 
including exceedances when re-monitoring, and you must use the landfill 
gas collection efficiencies in Table HH-3 of this subpart applicable to 
``landfills for which surface methane concentration measurements are 
conducted.''
    (ii) For landfills with landfill gas collection systems that are 
not required to conduct surface methane concentration measurements 
according to 40 CFR part 60, subparts Cc, Cf, WWW or XXX or according 
to 40 CFR part 62, subpart GGG or OOO but elect to conduct surface 
methane concentration measurements in lieu of meeting the requirements 
in paragraph (c)(4)(iii) of this section for landfills with landfill 
gas collection systems that do not conduct surface methane 
concentration measurements, you must use the method for conducting 
surface methane concentration measurements described in Sec.  
98.344(g)(7) of this subpart, you must account for each exceedance 
including re-monitoring exceedances (if re-monitoring is conducted), 
and you must use the landfill gas collection efficiencies in Table HH-3 
of this subpart applicable to ``landfills for which surface methane 
concentration measurements are conducted.''
    (iii) For landfills with landfill gas collection systems that are 
not required to conduct surface methane concentration measurements 
according to 40 CFR part 60, subparts Cc, Cf, WWW or XXX or according 
to 40 CFR part 62, subpart GGG or OOO and elect not to conduct surface 
methane concentration measurements, you must use the landfill gas 
collection efficiencies in Table HH-3 of this subpart applicable to 
``landfills for which no surface methane concentration measurements are 
conducted.''
0
34. Amend Sec.  98.344 by adding paragraph (g) to read as follows:

Sec.  98.344  Monitoring and QA/QC requirements.

* * * * *
    (g) The owner or operator shall conduct surface methane 
concentration measurements according to the requirements in paragraphs 
(g)(1) through (7) of this section, as applicable.
    (1) For landfills with landfill gas collection systems that are 
required to conduct surface methane concentration measurements 
according to 40 CFR part 60, subpart Cc, you must monitor surface 
concentrations of methane according to the procedures in Sec.  
60.755(c) and the instrument specifications in Sec.  60.755(d) of this 
chapter.
    (2) For landfills with landfill gas collection systems that are 
required to conduct surface methane concentration measurements 
according to 40 CFR part 60, subpart Cf, you must monitor surface 
concentrations of methane according to the procedures in Sec.  
60.36f(c) and the instrument specifications in Sec.  60.36f(d) of this 
chapter.
    (3) For landfills with landfill gas collection systems that are 
required to conduct surface methane concentration measurements 
according to 40 CFR part 60, subpart WWW, you must monitor surface 
concentrations of methane according to the procedures in Sec.  
60.755(c) and the instrument specifications in Sec.  60.755(d) of this 
chapter.
    (4) For landfills with landfill gas collection systems that are 
required to conduct surface methane concentration measurements 
according to 40 CFR part 60, subpart XXX, you must monitor surface 
concentrations of methane according to the procedures in Sec.  
60.765(c) and the instrument specifications in Sec.  60.765(d) of this 
chapter.
    (5) For landfills with landfill gas collection systems that are 
required to conduct surface methane concentration measurements 
according to 40 CFR part 62, subpart GGG, you must monitor surface 
concentrations of methane according to the procedures in Sec.  
60.755(c) and the instrument specifications in Sec.  60.755(d) of this 
chapter.
    (6) For landfills with landfill gas collection systems that are 
required to conduct surface methane concentration measurements 
according to 40 CFR part 62, subpart OOO, you must monitor surface 
concentrations of methane according to the procedures in Sec.  
62.16720(c) and the instrument specifications in Sec.  60.16720(d) of 
this chapter.
    (7) For landfills with landfill gas collection systems that are not 
required to conduct surface methane concentration measurements 
according to 40 CFR part 60, subparts Cc, Cf, WWW or XXX or according 
to 40 CFR part 62, subpart GGG or OOO but elect to conduct surface 
methane concentration measurements, you must monitor surface 
concentrations of methane according to the procedures in Sec.  
60.765(c) and the instrument specifications in Sec.  60.765(d) of this 
chapter.
0
35. Amend Sec.  98.346 by:
0
a. Redesignating paragraph (i) as paragraph (j).
0
b. Revising newly redesignated paragraphs (j)(5) through (7)
0
c. Redesignating paragraph (h) as paragraph (i).
0
d. Adding new paragraph (h) to read as follows:

Sec.  98.346  Data reporting requirements.

* * * * *
    (h) An indication of the applicability of 40 CFR part 60 or part 62 
requirements to the landfill (40 CFR part 60, subpart WWW, 40 CFR part 
60, subpart XXX, approved state plan implementing 40 CFR part 60, 
subparts Cc or Cf, Federal plan as implemented at 40 CFR part 62, 
subparts GGG or OOO, or not subject to 40 CFR part 60 or part 62 
municipal solid waste landfill rules) and, if the landfill is subject 
to a 40 CFR part 60 or part 62 municipal solid waste landfill rule, an 
indication of whether the landfill exceeds the applicable nonmethane 
organic carbon emission rates requiring landfill gas collection.
* * * * *
    (j) * * *
    (5) The number of gas collection systems at the landfill facility.
    (6) For each gas collection system at the facility report:

[[Page 32933]]

    (i) A unique name or ID number for the gas collection system.
    (ii) A description of the gas collection system (manufacturer, 
capacity, and number of wells).
    (iii) The annual hours the gas collection system was operating 
normally. Do not include periods of shut down or poor operation, such 
as times when pressure, temperature, or other parameters indicative of 
operation are outside of normal variances, in the annual operating 
hours.
    (iv) The number of measurement locations associated with the gas 
collection system.
    (v) For each measurement location associated with the gas 
collection system, report:
    (A) A unique name or ID number for the measurement location.

    [sum3]Cc=1[lsqb3][sum3]Xx=1[1][rsqb3].

    (B) Annual quantity of recovered CH4 (metric tons 
CH4) calculated using Equation HH-4 of this subpart.
    (C) An indication of whether destruction occurs at the landfill 
facility, off-site, or both for the measurement location.
    (D) If destruction occurs at the landfill facility for the 
measurement location (in full or in part), also report the number of 
destruction devices associated with the measurement location that are 
located at the landfill facility and the information in paragraphs 
(j)(6)(v)(D)(1) through (6) of this section for each destruction device 
located at the landfill facility.
    (1) A unique name or ID number for the destruction device.
    (2) The type of destruction device (flare, a landfill gas to energy 
project (i.e., engine or turbine), off-site, or other (specify)).
    (3) The destruction efficiency (decimal).
    (4) The total annual hours where active gas flow was sent to the 
destruction device.
    (5) The annual operating hours where active gas flow was sent to 
the destruction device and the destruction device was operating at its 
intended temperature or other parameter indicative of effective 
operation. For flares, times when there is no pilot flame present must 
be excluded from the annual operating hours for the destruction device.
    (6) The estimated fraction of the recovered CH4 reported 
for the measurement location directed to the destruction device based 
on best available data or engineering judgement (decimal, must total to 
1 for each measurement location).
    (7) The following information about the landfill.
    (i) The surface area (square meters) and estimated waste depth 
(meters) for each area specified in Table HH-3 to this subpart.
    (ii) The estimated gas collection system efficiency for the 
landfill.
    (iii) An indication of whether passive vents and/or passive flares 
(vents or flares that are not considered part of the gas collection 
system as defined in Sec.  98.6) are present at the landfill.
    (iv) An indication of whether surface methane concentration 
measurements were made at the landfill during the reporting year, the 
frequency of routine measurements (annual, semiannual, quarterly, 
bimonthly, monthly, or varied during the reporting year), and the total 
number of surface methane concentration measurements that exceeded 500 
parts per million above background during the reporting year.
    (v) For each surface methane concentration measurement that 
exceeded 500 parts per million above background during the reporting 
year report:
    (A) A unique name or ID number for the surface measurement.
    (B) The date of the measurement.
    (C) The measured methane concentration (in parts per million by 
volume).
    (D) The leak duration (days).
* * * * *
0
36. Revise table HH-1 to subpart HH of part 98 to read as follows:

              Table HH-1 to Subpart HH of Part 98--Emissions Factors, Oxidation Factors and Methods
----------------------------------------------------------------------------------------------------------------
                 Factor                        Default value                           Units
----------------------------------------------------------------------------------------------------------------
                                       DOC and k values--Bulk waste option
----------------------------------------------------------------------------------------------------------------
DOC (bulk waste).......................  0.17....................  Weight fraction, wet basis.
k (precipitation plus recirculated       0.055...................  yr-\1\.
 leachate \a\ <20 inches/year).
k (precipitation plus recirculated       0.111...................  yr-\1\.
 leachate \a\ 20-40 inches/year).
k (precipitation plus recirculated       0.142...................  yr-\1\.
 leachate \a\ >40 inches/year).
----------------------------------------------------------------------------------------------------------------
                                   DOC and k values--Modified bulk MSW option
----------------------------------------------------------------------------------------------------------------
DOC (bulk MSW, excluding inerts and C&D  0.27....................  Weight fraction, wet basis.
 waste).
DOC (inerts, e.g., glass, plastics,      0.00....................  Weight fraction, wet basis.
 metal, concrete).
DOC (C&D waste)........................  0.08....................  Weight fraction, wet basis.
k (bulk MSW, excluding inerts and C&D    0.055 to 0.142 \b\......  yr-\1\.
 waste).
k (inerts, e.g., glass, plastics,        0.00....................  yr-\1\.
 metal, concrete).
k (C&D waste)..........................  0.02 to 0.04 \b\........  yr-\1\.
----------------------------------------------------------------------------------------------------------------
                                   DOC and k values--Waste composition option
----------------------------------------------------------------------------------------------------------------
DOC (food waste).......................  0.15....................  Weight fraction, wet basis.
DOC (garden)...........................  0.2.....................  Weight fraction, wet basis.
DOC (paper)............................  0.4.....................  Weight fraction, wet basis.
DOC (wood and straw)...................  0.43....................  Weight fraction, wet basis.
DOC (textiles).........................  0.24....................  Weight fraction, wet basis.
DOC (diapers)..........................  0.24....................  Weight fraction, wet basis.
DOC (sewage sludge)....................  0.05....................  Weight fraction, wet basis.
DOC (inerts, e.g., glass, plastics,      0.00....................  Weight fraction, wet basis.
 metal, cement).
DOC (Uncharacterized MSW)..............  0.32....................  Weight fraction, wet basis.
k (food waste).........................  0.06 to 0.185 \c\.......  yr-\1\.
k (garden).............................  0.05 to 0.10 \c\........  yr-\1\.
k (paper)..............................  0.04 to 0.06 \c\........  yr-\1\.
k (wood and straw).....................  0.02 to 0.03 \c\........  yr-\1\.

[[Page 32934]]

 
k (textiles)...........................  0.04 to 0.06 \c\........  yr-\1\.
k (diapers)............................  0.05 to 0.10 \c\........  yr-\1\.
k (sewage sludge)......................  0.06 to 0.185 \c\.......  yr-\1\.
k (inerts, e.g., glass, plastics,        0.00....................  yr-\1\.
 metal, concrete).
k (uncharacterized MSW)................  0.055 to 0.142 \b\......  yr-\1\.
----------------------------------------------------------------------------------------------------------------
                                       Other parameters--All MSW landfills
----------------------------------------------------------------------------------------------------------------
MCF....................................  1.......................
DOCF...................................  0.5.....................
F......................................  0.5.....................
OX.....................................  See Table HH-4 of this
                                          subpart.
DE.....................................  0.99....................
----------------------------------------------------------------------------------------------------------------
\a\ Recirculated leachate (in inches/year) is the total volume of leachate recirculated from company records or
  engineering estimates divided by the area of the portion of the landfill containing waste with appropriate
  unit conversions. Alternatively, landfills that use leachate recirculation can elect to use the k value of
  0.142 rather than calculating the recirculated leachate rate.
\b\ Use the lesser value when precipitation plus recirculated leachate is less than 20 inches/year. Use the
  greater value when precipitation plus recirculated leachate is greater than 40 inches/year. Use the average of
  the range of values when precipitation plus recirculated leachate is 20 to 40 inches/year (inclusive).
  Alternatively, landfills that use leachate recirculation can elect to use the greater value rather than
  calculating the recirculated leachate rate.
\c\ Use the lesser value when the potential evapotranspiration rate exceeds the mean annual precipitation rate
  plus recirculated leachate. Use the greater value when the potential evapotranspiration rate does not exceed
  the mean annual precipitation rate plus recirculated leachate. Alternatively, landfills that use leachate
  recirculation can elect to use the greater value rather than assessing the potential evapotranspiration rate
  or recirculated leachate rate.

0
37. Amend table HH-3 to subpart HH of part 98 to read as follows:

                    Table HH-3 to Subpart HH of Part 98--Landfill Gas Collection Efficiencies
----------------------------------------------------------------------------------------------------------------
                                                              Landfill gas collection efficiency
                                             -------------------------------------------------------------------
                                                                                Landfills for     Landfills for
                                                                                which surface   which no surface
                 Description                                                       methane           methane
                                                          Term ID               concentration     concentration
                                                                              measurements \1\  measurements \1\
                                                                                are conducted     are conducted
                                                                                     (%)               (%)
----------------------------------------------------------------------------------------------------------------
A1: Area with no waste in-place.............  Not applicable; do not use this area in the calculation.
                                             -------------------------------------------------------------------
A2: Area without active gas collection,       CE2...........................                 0                 0
 regardless of cover type.
A3: Area with daily soil cover and active     CE3...........................                60                50
 gas collection.
A4: Area with an intermediate soil cover, or  CE4...........................                75                65
 a final soil cover not meeting the criteria
 for A5 below, and active gas collection.
A5: Area with a final soil cover of 3 feet    CE5...........................                95                85
 or thicker of clay or final cover (as
 approved by the relevant agency) and/or
 geomembrane cover system and active gas
 collection.
                                             -------------------------------------------------------------------
Area weighted average collection efficiency   CEave1 = (A2*CE2 + A3*CE3 + A4*CE4 + A5*CE5)/(A2 + A3 + A4 + A5).
 for landfills.
----------------------------------------------------------------------------------------------------------------
\1\ Surface methane concentration measurements include only those conducted as required under 40 CFR part 60,
  subparts WWW or XXX, or approved state plans to implement the emission guidelines in 40 CFR part 60, subparts
  Cc or Cf, or Federal plan at 40 CFR part 62 subparts GGG or OOO, or, for those electing to conduct surface
  concentration measurements, those conducted according to the method provided in Sec.   98.344(g) of this
  subpart.

0
38. Revise footnote ``b'' to table HH-4 to subpart HH of part 98 to 
read as follows:

[[Page 32935]]

     Table HH-4 to Subpart HH of Part 98--Landfill Methane Oxidation
                                Fractions
------------------------------------------------------------------------
                                                      Use this landfill
              Under these conditions:                 methane oxidation
                                                          fraction:
------------------------------------------------------------------------
 
                              * * * * * * *
------------------------------------------------------------------------
 * * * * * * *
\b\ Methane flux rate (in grams per square meter per day; g/m\2\/d) is
  the mass flow rate of methane per unit area at the bottom of the
  surface soil prior to any oxidation and is calculated as follows:

    For Equation HH-5 of this subpart, or for Equation TT-6 of subpart 
TT of this part,

MF = K x GCH4/SArea

    For Equation HH-6 of this subpart,
    [GRAPHIC] [TIFF OMITTED] TP22MY23.009
    
    For Equation HH-7 of this subpart,
    [GRAPHIC] [TIFF OMITTED] TP22MY23.010
    
    For Equation HH-8 of this subpart,
    [GRAPHIC] [TIFF OMITTED] TP22MY23.011
    
Where:

MF = Methane flux rate from the landfill in the reporting year 
(grams per square meter per day, g/m\2\/d).
K = unit conversion factor = 10\6\/365 (g/metric ton per days/year) 
or 10\6\/366 for a leap year.
SArea = The surface area of the landfill containing waste at the 
beginning of the reporting year (square meters, m\2\).
GCH4 = Modeled methane generation rate in reporting year 
from Equation HH-1 of this subpart or Equation TT-1 of subpart TT of 
this part, as applicable, except for application with Equation HH-6 
of this subpart (metric tons CH4). For application with 
Equation HH-6 of this subpart, the greater of the modeled methane 
generation rate in reporting year from Equation HH-1 of this subpart 
or Equation TT-1 of this part, as applicable, and the quantity of 
recovered CH4 from Equation HH-4 of this subpart (metric 
tons CH4).
CE = Collection efficiency estimated at landfill, taking into 
account system coverage, operation, measurement practices, and cover 
system materials from Table HH-3 of this subpart. If area by soil 
cover type information is not available, use applicable default 
value for CE4 in Table HH-3 of this subpart for all areas under 
active influence of the collection system.
C = Number of landfill gas collection systems operated at the 
landfill.
X = Number of landfill gas measurement locations associated with 
landfill gas collection system ``c''.
N = Number of landfill gas measurement locations (associated with a 
destruction device or gas sent off-site). If a single monitoring 
location is used to monitor volumetric flow and CH4 
concentration of the recovered gas sent to one or multiple 
destruction devices, then N = 1. Note that N = [Sigma]c=1C 
[[Sigma]x=1X[1]].
Rx,c = Quantity of recovered CH4 from Equation 
HH-4 of this subpart for the xth measurement location for landfill 
gas collection system ``c'' (metric tons CH4).
Rn = Quantity of recovered CH4 from Equation 
HH-4 of this subpart for the nth measurement location (metric tons 
CH4).
fRec,c = Fraction of hours the landfill gas collection 
system ``c'' was operating normally (annual operating hours/8760 
hours per year or annual operating hours/8784 hours per year for a 
leap year). Do not include periods of shutdown or poor operation, 
such as times when pressure, temperature, or other parameters 
indicative of operation are outside of normal variances, in the 
annual operating hours.

Subpart OO--Suppliers of Industrial Greenhouse Gases

0
39. Amend Sec.  98.416 by:
0
a. Revising paragraph (c) introductory text;
0
b. Adding paragraph (c)(11);
0
c. Revising paragraph (d) introductory text; and
0
d. Adding paragraph (k).
    The revisions and additions read as follows:

Sec.  98.416  Data reporting requirements.

* * * * *
    (c) Each bulk importer of fluorinated GHGs, fluorinated HTFs, or 
nitrous oxide shall submit an annual report that summarizes its imports 
at the corporate level, except importers may exclude shipments 
including less than twenty-five kilograms of fluorinated GHGs, 
fluorinated HTFs, or nitrous oxide; transshipments if the importer also 
excludes transshipments from reporting of exports under paragraph (d) 
of this section; and heels that meet the conditions set forth at Sec.  
98.417(e) if the importer also excludes heels from any reporting of 
exports under paragraph (d) of this section. The report shall contain 
the following information for each import:
* * * * *
    (11) For all GHGs that are not regulated substances under 40 CFR 
part 84 (Phasedown of Hydrofluorocarbons), a copy of the corresponding 
U.S. Customs entry form for each reported import.
    (d) Each bulk exporter of fluorinated GHGs, fluorinated HTFs, or 
nitrous oxide shall submit an annual report that summarizes its exports 
at the corporate level, except exporters may exclude shipments 
including less than twenty-five kilograms of fluorinated GHGs, 
fluorinated HTFs, or nitrous oxide; transshipments if the exporter also 
excludes transshipments from reporting of imports under paragraph (c) 
of this section; and heels if the exporter also

[[Page 32936]]

excludes heels from any reporting of imports under paragraph (c) of 
this section. The report shall contain the following information for 
each export:
* * * * *
    (k) For nitrous oxide, saturated perfluorocarbons, sulfur 
hexafluoride, and fluorinated heat transfer fluids as defined at Sec.  
98.6, report the end use(s) for which each GHG or fluorinated HTF is 
transferred and the aggregated annual quantity of that GHG or 
fluorinated HTF in metric tons that is transferred to that end use 
application, if known.

Subpart PP--Suppliers of Carbon Dioxide

0
40. Amend Sec.  98.426 by:
0
a. Redesignating paragraphs (f)(12) and (13) as paragraphs (f)(13) and 
(14), respectively;
0
b. Adding new paragraph (f)(12); and
0
c. Revising paragraph (h).
    The revisions and additions read as follows:

Sec.  98.426  Data reporting requirements.

* * * * *
    (f) * * *
    (12) Geologic sequestration of carbon dioxide with enhanced oil 
recovery that is covered by subpart VV of this part.
* * * * *
    (h) If you capture a CO2 stream from a facility that is 
subject to this part and transfer CO2 to any facilities that 
are subject to subpart RR or subpart VV of this part, you must:
    (1) Report the facility identification number associated with the 
annual GHG report for the facility that is the source of the captured 
CO2 stream;
    (2) Report each facility identification number associated with the 
annual GHG reports for each subpart RR and subpart VV facility to which 
CO2 is transferred; and
    (3) Report the annual quantity of CO2 in metric tons 
that is transferred to each subpart RR and subpart VV facility.

Subpart QQ--Importers and Exporters of Fluorinated Greenhouse Gases 
Contained in Pre-Charged Equipment or Closed-Cell Foams

0
41. Amend Sec.  98.436 by adding paragraphs (a)(7) and (8) and (b)(7) 
to read as follows:

Sec.  98.436  Data reporting requirements.

    (a) * * *
    (7) The Harmonized tariff system (HTS) code for each type of pre-
charged equipment or closed-cell foam imported.
    (8) A copy of the corresponding U.S. Customs entry form for each 
reported import.
    (b) * * *
    (7) The Schedule B code for each type of pre-charged equipment or 
closed-cell foam exported.

Subpart RR--Geologic Sequestration of Carbon Dioxide

    42. Add the definition of ``Offshore'' in Sec.  98.449 to read as 
follows:

Sec.  98.449  Definitions.

* * * * *
    Offshore means seaward of the terrestrial borders of the United 
States, including waters subject to the ebb and flow of the tide, as 
well as adjacent bays, lakes or other normally standing waters, and 
extending to the outer boundaries of the jurisdiction and control of 
the United States under the Outer Continental Shelf Lands Act.
* * * * *

Subpart UU--Injection of Carbon Dioxide

0
43. Amend Sec.  98.470 by:
0
a. Revising paragraph (b);
0
b. Redesignating paragraph (c) as paragraph (d); and
0
c. Adding new paragraph (c).
    The revisions and additions read as follows:

Sec.  98.470  Definition of the source category.

* * * * *
    (b) If you report under subpart RR of this part for a well or group 
of wells, you shall not report under this subpart for that well or 
group of wells.
    (c) If you report under subpart VV of this part for a well or group 
of wells, you shall not report under this subpart for that well or 
group of wells. If you previously met the source category definition 
for subpart UU for a project where CO2 is injected in 
enhanced recovery operations for oil and other hydrocarbons 
(CO2-EOR) and then began using the International Standards 
Organization (ISO) standard designated as CSA/ANSI ISO 27916:2019 
(incorporated by reference, see Sec.  98.7) such that you met the 
definition of the source category for subpart VV during a reporting 
year, you must report under subpart UU for the portion of the year 
before you began using CSA/ANSI ISO 27916:2019 and report under subpart 
VV for the portion of the year after you began using CSA/ANSI ISO 
27916:2019.
    (d) A facility that is subject to this part only because it is 
subject to subpart UU of this part is not required to report emissions 
under subpart C of this part or any other subpart listed in Sec.  
98.2(a)(1) or (2).
0
44. Add subpart VV to read as follows:
Subpart VV--Geologic Sequestration of Carbon Dioxide with Enhanced Oil 
Recovery Using ISO 27916
Sec.
98.480 Definition of the source category.
98.481 Reporting threshold.
98.482 GHGs to report.
98.483 Calculating CO2 geologic sequestration.
98.484 Monitoring and QA/QC requirements.
98.485 Procedures for estimating missing data.
98.486 Data reporting requirements.
98.487 Records that must be retained.
98.488 EOR Operations Management Plan.
98.489 Definitions.

Sec.  98.480  Definition of the source category.

    (a) This source category pertains to carbon dioxide 
(CO2) that is injected in enhanced recovery operations for 
oil and other hydrocarbons (CO2-EOR) in which all of the 
following apply:
    (1) You are using the International Standards Organization (ISO) 
standard designated as CSA/ANSI ISO 27916:2019, ``Carbon Dioxide 
Capture, Transportation and Geological Storage--Carbon Dioxide Storage 
Using Enhanced Oil Recovery (CO2-EOR)'' (CSA/ANSI ISO 
27916:2019) (incorporated by reference, see Sec.  98.7) as a method of 
quantifying geologic sequestration of CO2 in association 
with EOR operations.
    (2) You are not reporting under subpart RR of this part.
    (b) This source category does not include wells permitted as Class 
VI under the Underground Injection Control program.
    (c) If you are subject to only this subpart, you are not required 
to report emissions under subpart C of this part or any other subpart 
listed in Sec.  98.2(a)(1) or (2).

Sec.  98.481  Reporting threshold.

    (a) You must report under this subpart if your CO2-EOR 
project uses CSA/ANSI ISO 27916:2019 (incorporated by reference, see 
Sec.  98.7) as a method of quantifying geologic sequestration of 
CO2 in association with CO2-EOR operations. There 
is no threshold for reporting.
    (b) The requirements of Sec.  98.2(i) do not apply to this subpart. 
Once a CO2-EOR project becomes subject to the requirements 
of this subpart, you must continue for each year thereafter to comply 
with all requirements of this subpart, including the requirement to 
submit annual reports until the facility has met the requirements of 
paragraphs (b)(1) and (2) of this section and submitted a notification 
to discontinue reporting according to paragraph (b)(3) of this section.
    (1) Discontinuation of reporting under this subpart must follow the

[[Page 32937]]

requirements set forth under Clause 10 of CSA/ANSI ISO 27916:2019.
    (2) CO2-EOR project termination is completed when all of 
the following occur:
    (i) Cessation of CO2 injection.
    (ii) Cessation of hydrocarbon production from the project 
reservoir; and
    (iii) Wells are plugged and abandoned unless otherwise required by 
the appropriate regulatory authority.
    (3) You must notify the Administrator of your intent to cease 
reporting and provide a copy of the CO2-EOR project 
termination documentation.
    (c) If you previously met the source category definition for 
subpart UU for your CO2-EOR project and then began using 
CSA/ANSI ISO 27916:2019 as a method of quantifying geologic 
sequestration of CO2 in association with CO2-EOR 
operations during a reporting year, you must report under subpart UU 
for the portion of the year before you began using CSA/ANSI ISO 
27916:2019 and report under subpart VV for the portion of the year 
after you began using CSA/ANSI ISO 27916:2019.

Sec.  98.482  GHGs to report.

    You must report the following from Clause 8 of CSA/ANSI ISO 
27916:2019 (incorporated by reference, see Sec.  98.7):
    (a) The mass of CO2 received by the CO2-EOR 
project.
    (b) The mass of CO2 loss from the CO2-EOR 
project operations.
    (c) The mass of native CO2 produced and captured.
    (d) The mass of CO2 produced and sent off-site.
    (e) The mass of CO2 loss from the EOR complex.
    (f) The mass of CO2 stored in association with 
CO2-EOR.

Sec.  98.483  Calculating CO2 geologic sequestration.

    You must calculate CO2 sequestered using the following 
quantification principles from Clause 8.2 of CSA/ANSI ISO 27916:2019 
(incorporated by reference, see Sec.  98.7).
    (a) You must calculate the mass of CO2 stored in 
association with CO2-EOR (mstored) in the 
reporting year by subtracting the mass of CO2 loss from 
operations and the mass of CO2 loss from the EOR complex 
from the total mass of CO2 input (as specified in Equation 
VV-1 of this section).
[GRAPHIC] [TIFF OMITTED] TP22MY23.012

Where:

mstored = the annual quantity of associated storage in 
metric tons of CO2 mass.
minput = the total mass of CO2 
mreceived by the EOR project plus mnative (see 
Clause 8.3 and paragraph (c) of this section), metric tons. Native 
CO2 produced and captured in the CO2-EOR 
project (mnative) can be quantified and included in 
minput.
mloss operations = the total mass of CO2 loss 
from project operations (see Clauses 8.4.1 through 8.4.5 and 
paragraph (d) of this section), metric tons.
mloss EOR complex = the total mass of CO2 loss 
from the EOR complex (see Clause 8.4.6), metric tons.

    (b) The manner by which associated storage is quantified must 
assure completeness and preclude double counting. The annual mass of 
CO2 that is recycled and reinjected into the EOR complex 
must not be quantified as associated storage. Loss from the 
CO2 recycling facilities must be quantified.
    (c) You must quantify the total mass of CO2 input 
(minput) in the reporting year according to paragraphs 
(g)(1) through (3) of this section.
    (1) You must include the total mass of CO2 received at 
the custody transfer meter by the CO2-EOR project 
(mreceived).
    (2) The CO2 stream received (including CO2 
transferred from another CO2-EOR project) must be metered.
    (A) The native CO2 recovered and included as 
mnative must be documented.
    (B) CO2 delivered to multiple CO2-EOR 
projects must be allocated among those CO2-EOR projects.
    (3) The sum of the quantities of allocated CO2 must not 
exceed the total quantities of CO2 received.
    (d) You must calculate the total mass of CO2 from 
project operations (mloss operations) in the reporting year 
as specified in Equation VV-2 of this section.
[GRAPHIC] [TIFF OMITTED] TP22MY23.013

Where:

mloss leakage facilities = Loss of CO2 due to 
leakage from production, handling, and recycling CO2-EOR 
facilities (infrastructure including wellheads), metric tons.
mloss vent/flare = Loss of CO2 from venting/
flaring from production operations, metric tons.
mloss entrained = Loss of CO2 due to 
entrainment within produced gas/oil/water when this CO2 
is not separated and reinjected, metric tons.
mloss transfer = Loss of CO2 due to any 
transfer of CO2 outside the CO2-EOR project, 
metric tons. You must quantify any CO2 that is 
subsequently produced from the EOR complex and transferred offsite.

Sec.  98.484  Monitoring and QA/QC requirements.

    You must use the applicable monitoring and quality assurance 
requirements set forth in Clause 6.2 of CSA/ANSI ISO 27916:2019 
(incorporated by reference, see Sec.  98.7).

Sec.  98.485  Procedures for estimating missing data.

    Whenever the value of a parameter is unavailable or the quality 
assurance procedures set forth in Sec.  98.484 cannot be followed, you 
must follow the procedures set forth in Clause 9.2 of CSA/ANSI ISO 
27916:2019 (incorporated by reference, see Sec.  98.7).

Sec.  98.486  Data reporting requirements.

    In addition to the information required by Sec.  98.3(c), the 
annual report shall contain the following information, as applicable:
    (a) The annual quantity of associated storage in metric tons of 
CO2 (mstored).
    (b) The density of CO2 if volumetric units are converted 
to mass in order to be reported for annual quantity of CO2 
stored.
    (c) The annual quantity of CO2 input (minput) 
and the information in paragraphs (c)(1) and (2) of this section.
    (1) The annual total mass of CO2 received at the custody 
transfer meter by the CO2-EOR project, including 
CO2

[[Page 32938]]

transferred from another CO2-EOR project 
(mreceived).
    (2) The annual mass of native CO2 produced and captured 
in the CO2-EOR project (mnative).
    (d) The annual mass of CO2 that is recycled and 
reinjected into the EOR complex.
    (e) The annual total mass of CO2 loss from project 
operations (mloss operations), and the information in 
paragraphs (e)(1) through (4) of this section.
    (1) Loss of CO2 due to leakage from production, 
handling, and recycling CO2-EOR facilities (infrastructure 
including wellheads) (mloss leakage facilities).
    (2) Loss of CO2 from venting/flaring from production 
operations (mloss vent/flare).
    (3) Loss of CO2 due to entrainment within produced gas/
oil/water when this CO2 is not separated and reinjected 
(mloss entrained).
    (4) Loss of CO2 due to any transfer of CO2 
outside the CO2-EOR project (mloss transfer).
    (f) The total mass of CO2 loss from the EOR complex 
(mloss EOR complex).
    (g) Annual documentation that contains the following components as 
described in Clause 4.4 of CSA/ANSI ISO 27916:2019 (incorporated by 
reference, see Sec.  98.7):
    (1) The formulas used to quantify the annual mass of associated 
storage, including the mass of CO2 delivered to the 
CO2-EOR project and losses during the period covered by the 
documentation (see Clause 8 and Annex B).
    (2) The methods used to estimate missing data and the amounts 
estimated as described in Clause 9.2.
    (3) The approach and method for quantification utilized by the 
operator, including accuracy, precision, and uncertainties (see Clause 
8 and Annex B).
    (4) A statement describing the nature of validation or verification 
including the date of review, process, findings, and responsible person 
or entity.
    (5) Source of each CO2 stream quantified as associated 
storage (see Clause 8.3).
    (6) A description of the procedures used to detect and characterize 
the total CO2 leakage from the EOR complex.
    (7) If only the mass of anthropogenic CO2 is considered 
for mstored, a description of the derivation and application 
of anthropogenic CO2 allocation ratios for all the terms 
described in Clauses 8.1 to 8.4.6.
    (8) Any documentation provided by a qualified independent engineer 
or geologist, who certifies that the documentation provided, including 
the mass balance calculations as well as information regarding 
monitoring and containment assurance, is accurate and complete.
    (h) Any changes made within the reporting year to containment 
assurance and monitoring approaches and procedures in the EOR 
operations management plan.

Sec.  98.487  Records that must be retained.

    You must follow the record retention requirements specified by 
Sec.  98.3(g). In addition to the records required by Sec.  98.3(g), 
you must comply with the record retention requirements in Clause 9.1 of 
CSA/ANSI ISO 27916:2019 (incorporated by reference, see Sec.  98.7).

Sec.  98.488  EOR Operations Management Plan.

    (a) You must prepare and update, as necessary, a general EOR 
operations management plan that provides a description of the EOR 
complex and engineered system (see Clause 4.3 (a)), establishes that 
the EOR complex is adequate to provide safe, long-term containment of 
CO2, and includes site-specific and other information 
including:
    (1) Geologic characterization of the EOR complex.
    (2) A description of the facilities within the CO2-EOR 
project.
    (3) A description of all wells and other engineered features in the 
CO2-EOR project.
    (4) The operations history of the project reservoir.
    (5) The information set forth in Clauses 5 and 6 of CSA/ANSI ISO 
27916:2019 (incorporated by reference, see Sec.  98.7).
    (b) You must prepare initial documentation at the beginning of the 
quantification period, and include the following as described in the 
EOR operations management plan:
    (1) A description of the EOR complex and engineered systems (see 
Clause 5).
    (2) The initial containment assurance (see Clause 6.1.2).
    (3) The monitoring program (see Clause 6.2).
    (4) The quantification method to be used (see Clause 8 and Annex 
B).
    (5) The total mass of previously injected CO2 (if any) 
within the EOR complex at the beginning of the CO2-EOR 
project (see Clause 8.5 and Annex B).
    (c) The EOR operation management plan in paragraph (a) of this 
section and initial documentation in paragraph (b) of this section must 
be submitted to the Administrator with the annual report covering the 
first reporting year that the facility reports under this subpart. In 
addition, any documentation provided by a qualified independent 
engineer or geologist, who certifies that the documentation provided is 
accurate and complete, must also be provided to the Administrator.
    (d) If the EOR operations management plan is updated, the updated 
EOR management plan must be submitted to the Administrator with the 
annual report covering the first reporting year for which the updated 
EOR operation management plan is applicable.

Sec.  98.489  Definitions.

    Except as provided in paragraphs (a) and (b) of this section, all 
terms used in this subpart have the same meaning given in the Clean Air 
Act and subpart A of this part.
    (a) Additional terms and definitions are provided in Clause 3 of 
CSA/ANSI ISO 27916:2019 (incorporated by reference, see Sec.  98.7) and 
incorporated herein by reference.
    (b) All references in this subpart preceded by the word Clause 
refer to the Clauses in CSA/ANSI ISO 27916:2019.
0
45. Add subpart WW to read as follows:
Subpart WW--Coke Calciners
Sec.
98.490 Definition of source category.
98.491 Reporting threshold.
98.492 GHGs to report.
98.493 Calculating GHG emissions.
98.494 Monitoring and QA/QC requirements.
98.495 Procedures for estimating missing data.
98.496 Data reporting requirements.
98.497 Records that must be retained.
98.498 Definitions.

Sec.  98.490  Definition of source category.

    (a) A coke calciner is a process unit that heats petroleum coke to 
high temperatures in the absence of air or oxygen for the purpose of 
removing impurities or volatile substances in the petroleum coke 
feedstock.
    (b) This source category consists of rotary kilns, rotary hearth 
furnaces, or similar process units used to calcine petroleum coke and 
also includes afterburners or other emission control systems used to 
treat the coke calcining unit's process exhaust gas.

Sec.  98.491  Reporting threshold.

    You must report GHG emissions under this subpart if your facility 
contains a coke calciner and the facility meets the requirements of 
either Sec.  98.2(a)(1) or (2).

Sec.  98.492  GHGs to report.

    You must report:
    (a) CO2, CH4, and N2O emissions 
from each coke calcining unit under this subpart.

[[Page 32939]]

    (b) CO2, CH4, and N2O emissions 
from auxiliary fuel used in the coke calcining unit and afterburner, if 
applicable, or other control system used to treat the coke calcining 
unit's process off-gas under subpart C of this part (General Stationary 
Fuel Combustion Sources) by following the requirements of subpart C.

Sec.  98.493  Calculating GHG emissions.

    (a) Calculate GHG emissions required to be reported in Sec.  
98.492(a) using the applicable methods in paragraph (b) of this 
section.
    (b) For each coke calcining unit, calculate GHG emissions according 
to the applicable provisions in paragraphs (b)(1) through (4) of this 
section.
    (1) If you operate and maintain a CEMS that measures CO2 
emissions according to subpart C of this part, you must calculate and 
report CO2 emissions under this subpart by following the 
Tier 4 Calculation Methodology specified in Sec.  98.33(a)(4) and all 
associated requirements for Tier 4 in subpart C of this part (General 
Stationary Fuel Combustion Sources). Auxiliary fuel use CO2 
emissions should be calculated in accordance with subpart C of this 
part and subtracted from the CO2 CEMS emissions to determine 
process CO2 emissions. Other coke calcining units must 
either install a CEMS that complies with the Tier 4 Calculation 
Methodology in subpart C of this part or follow the requirements of 
paragraph (b)(2) of this section.
    (2) Calculate the CO2 emissions from the coke calcining 
unit using monthly measurements and Equation WW-1 of this section.
[GRAPHIC] [TIFF OMITTED] TP22MY23.014

Where:

CO2 = Annual CO2 emissions (metric tons 
CO2/year).
m = Month index.
Min,m = Mass of green coke fed to the coke calcining unit 
in month ``m'' from facility records (metric tons/year).
CCGC.m = Mass fraction carbon content of green coke fed 
to the coke calcining unit from facility measurement data in month 
``m'' (metric ton carbon/metric ton green coke). If measurements are 
made more frequently than monthly, determine the monthly average as 
the arithmetic average for all measurements made during the calendar 
month.
Mout,m = Mass of marketable petroleum coke produced by 
the coke calcining unit in month ``m'' from facility records (metric 
tons petroleum coke/year).
Mdust,m = Mass of petroleum coke dust removed from the 
process through the dust collection system of the coke calcining 
unit in month ``m'' from facility records (metric ton petroleum coke 
dust/year). For coke calcining units that recycle the collected 
dust, the mass of coke dust removed from the process is the mass of 
coke dust collected less the mass of coke dust recycled to the 
process.
CCMPC,m = Mass fraction carbon content of marketable 
petroleum coke produced by the coke calcining unit in month ``m'' 
from facility measurement data (metric ton carbon/metric ton 
petroleum coke). If measurements are made more frequently than 
monthly, determine the monthly average as the arithmetic average for 
all measurements made during the calendar month.
44 = Molecular weight of CO2 (kg/kg-mole).
12 = Atomic weight of C (kg/kg-mole).

    (3) Calculate CH4 emissions using Equation WW-2 of this 
section.
[GRAPHIC] [TIFF OMITTED] TP22MY23.015

Where:

CH4 = Annual methane emissions (metric tons 
CH4/year).
CO2 = Annual CO2 emissions calculated in 
paragraph (b)(1) or (2) of this section, as applicable (metric tons 
CO2/year).
EmF1 = Default CO2 emission factor for 
petroleum coke from Table C-1 of subpart C of this part (General 
Stationary Fuel Combustion Sources) (kg CO2/MMBtu).
EmF2 = Default CH4 emission factor for 
``Petroleum Products (All fuel types in Table C-1)'' from Table C-2 
of subpart C of this part (General Stationary Fuel Combustion 
Sources) (kg CH4/MMBtu).

    (4) Calculate N2O emissions using Equation WW-3 of this 
section.
    (Eq. WW-3)
    [GRAPHIC] [TIFF OMITTED] TP22MY23.016
    
Where:

N2O = Annual nitrous oxide emissions (metric tons 
N2O/year).
CO2 = Annual CO2 emissions calculated in 
paragraph (b)(1) or (2) of this section, as applicable (metric tons 
CO2/year).
EmF1 = Default CO2 emission factor for 
petroleum coke from Table C-1 of subpart C of this part (General 
Stationary Fuel Combustion Sources) (kg CO2/MMBtu).
EmF3 = Default N2O emission factor for 
``Petroleum Products (All fuel types in Table C-1)'' from Table C-2 
of subpart C of this part (kg N2O/MMBtu).

Sec.  98.494  Monitoring and QA/QC requirements.

    (a) Flow meters, gas composition monitors, and heating value 
monitors that are associated with sources that use a CEMS to measure 
CO2 emissions according to subpart C of this part or that 
are associated with stationary combustion sources must meet the 
applicable monitoring and QA/QC requirements in Sec.  98.34.
    (b) Determine the mass of petroleum coke monthly as required by 
Equation WW-1 of this subpart using mass measurement equipment meeting 
the requirements for commercial weighing equipment as described in 
Specifications, Tolerances, and Other Technical Requirements For 
Weighing and Measuring Devices, NIST Handbook 44 (2022) (incorporated 
by reference, see Sec.  98.7). Calibrate the measurement device 
according to the procedures specified by NIST handbook 44 (incorporated 
by reference, see Sec.  98.7) or the procedures specified by the 
manufacturer. Recalibrate either biennially or at the minimum frequency 
specified by the manufacturer.
    (c) Determine the carbon content of petroleum coke as required by 
Equation WW-1 of this subpart using any one of the following methods. 
Calibrate the measurement device according to procedures specified by 
the method or procedures specified by the measurement device 
manufacturer.
    (1) ASTM D3176-15 Standard Practice for Ultimate Analysis of Coal 
and Coke (incorporated by reference, see Sec.  98.7).
    (2) ASTM D5291-16 Standard Test Methods for Instrumental 
Determination of Carbon, Hydrogen, and Nitrogen in Petroleum Products 
and Lubricants (incorporated by reference, see Sec.  98.7).
    (3) ASTM D5373-21 Standard Test Methods for Determination of 
Carbon, Hydrogen, and Nitrogen in Analysis Samples of Coal and Carbon 
in Analysis

[[Page 32940]]

Samples of Coal and Coke (incorporated by reference, see Sec.  98.7).
    (d) The owner or operator shall document the procedures used to 
ensure the accuracy of the monitoring systems used including but not 
limited to calibration of weighing equipment, flow meters, and other 
measurement devices. The estimated accuracy of measurements made with 
these devices shall also be recorded.

Sec.  98.495  Procedures for estimating missing data.

    A complete record of all measured parameters used in the GHG 
emissions calculations is required (e.g., concentrations, flow rates, 
fuel heating values, carbon content values). Therefore, whenever a 
quality-assured value of a required parameter is unavailable (e.g., if 
a CEMS malfunctions during unit operation or if a required sample is 
not taken), a substitute data value for the missing parameter shall be 
used in the calculations.
    (a) For missing auxiliary fuel use data, use the missing data 
procedures in subpart C of this part.
    (b) For each missing value of mass or carbon content of coke, 
substitute the arithmetic average of the quality-assured values of that 
parameter immediately preceding and immediately following the missing 
data incident. If the ``after'' value is not obtained by the end of the 
reporting year, you may use the ``before'' value for the missing data 
substitution. If, for a particular parameter, no quality-assured data 
are available prior to the missing data incident, the substitute data 
value shall be the first quality-assured value obtained after the 
missing data period.
    (c) For missing CEMS data, you must use the missing data procedures 
in Sec.  98.35.

Sec.  98.496  Data reporting requirements.

    In addition to the reporting requirements of Sec.  98.3(c), you 
must report the information specified in paragraphs (a) through (i) of 
this section for each coke calcining unit.
    (a) The unit ID number (if applicable).
    (b) Maximum rated throughput of the unit, in metric tons coke 
calcined/stream day.
    (c) The calculated CO2, CH4, and 
N2O annual process emissions, expressed in metric tons of 
each pollutant emitted.
    (d) A description of the method used to calculate the 
CO2 emissions for each unit (e.g., CEMS or Equation WW-1).
    (e) Annual mass of green coke fed to the coke calcining unit from 
facility records (metric tons/year).
    (f) Annual mass of marketable petroleum coke produced by the coke 
calcining unit from facility records (metric tons/year).
    (g) Annual mass of petroleum coke dust removed from the process 
through the dust collection system of the coke calcining unit from 
facility records (metric tons/year) and an indication of whether coke 
dust is recycled to the unit (e.g., all dust is recycled, a portion of 
the dust is recycled, or none of the dust is recycled).
    (h) Annual average mass fraction carbon content of green coke fed 
to the coke calcining unit from facility measurement data (metric tons 
C per metric ton green coke).
    (i) Annual average mass fraction carbon content of marketable 
petroleum coke produced by the coke calcining unit from facility 
measurement data (metric tons C per metric ton petroleum coke).

Sec.  98.497  Records that must be retained.

    In addition to the records required by Sec.  98.3(g), you must 
retain the records specified in paragraphs (a) and (b) of this section.
    (a) The records of all parameters monitored under Sec.  98.494.
    (b) Verification software records. You must keep a record of the 
file generated by the verification software specified in Sec.  98.5(b) 
for the applicable data specified in paragraphs (b)(1) through (5) of 
this section. Retention of this file satisfies the recordkeeping 
requirement for the data in paragraphs (b)(1) through (5) of this 
section.
    (1) Monthly mass of green coke fed to the coke calcining unit from 
facility records (metric tons/year) (Equation WW-1 of Sec.  98.493).
    (2) Monthly mass of marketable petroleum coke produced by the coke 
calcining unit from facility records (metric tons/year) (Equation WW-
1).
    (3) Monthly mass of petroleum coke dust removed from the process 
through the dust collection system of the coke calcining unit from 
facility records (metric tons/year) (Equation WW-1).
    (4) Average monthly mass fraction carbon content of green coke fed 
to the coke calcining unit from facility measurement data (metric tons 
C per metric ton green coke) (Equation WW-1).
    (5) Average monthly mass fraction carbon content of marketable 
petroleum coke produced by the coke calcining unit from facility 
measurement data (metric tons C per metric ton petroleum coke) 
(Equation WW-1).

Sec.  98.498  Definitions.

    All terms used in this subpart have the same meaning given in the 
Clean Air Act and subpart A of this part.
0
46. Add subpart XX to read as follows:
Subpart XX--Calcium Carbide Production
Sec.
98.500 Definition of the source category.
98.501 Reporting threshold.
98.502 GHGs to report.
98.503 Calculating GHG emissions.
98.504 Monitoring and QA/QC requirements.
98.505 Procedures for estimating missing data.
98.506 Data reporting requirements.
98.507 Records that must be retained.
98.508 Definitions.

Sec.  98.500  Definition of the source category.

    The calcium carbide production source category consists of any 
facility that produces calcium carbide.

Sec.  98.501  Reporting threshold.

    You must report GHG emissions under this subpart if your facility 
contains a calcium carbide production process and the facility meets 
the requirements of either Sec.  98.2(a)(1) or (2).

Sec.  98.502  GHGs to report.

    You must report:
    (a) Process CO2 emissions from each calcium carbide 
process unit or furnace used for the production of calcium carbide.
    (b) CO2, CH4, and N2O emissions 
from each stationary combustion unit following the requirements of 
subpart C of this part. You must report these emissions under subpart C 
of this part (General Stationary Fuel Combustion Sources) by following 
the requirements of subpart C.

Sec.  98.503  Calculating GHG emissions.

    You must calculate and report the annual process CO2 
emissions from each calcium carbide process unit not subject to 
paragraph (c) of this section using the procedures in either paragraph 
(a) or (b) of this section.
    (a) Calculate and report under this subpart the combined process 
and combustion CO2 emissions by operating and maintaining 
CEMS according to the Tier 4 Calculation Methodology in Sec.  
98.33(a)(4) and all associated requirements for Tier 4 in subpart C of 
this part (General Stationary Fuel Combustion Sources).
    (b) Calculate and report under this subpart the annual process 
CO2 emissions from the calcium carbide process unit using 
the carbon mass balance procedure specified in paragraphs (b)(1) and 
(2) of this section.
    (1) For each calcium carbide process unit, determine the annual 
mass of carbon in each carbon-containing input and output material for 
the calcium carbide process unit and estimate annual process 
CO2 emissions from the

[[Page 32941]]

calcium carbide process unit using Equation XX-1 of this section. 
Carbon-containing input materials include carbon electrodes and 
carbonaceous reducing agents. If you document that a specific input or 
output material contributes less than 1 percent of the total carbon 
into or out of the process, you do not have to include the material in 
your calculation using Equation XX-1 of this section.
[GRAPHIC] [TIFF OMITTED] TP22MY23.017

[GRAPHIC] [TIFF OMITTED] TP22MY23.018

Where:

ECO2 = Annual process CO2 emissions from an 
individual calcium carbide process unit (metric tons).
44/12 = Ratio of molecular weights, CO2 to carbon.
2000/2205 = Conversion factor to convert tons to metric tons.
Mreducing agenti = Annual mass of reducing agent i fed, 
charged, or otherwise introduced into the calcium carbide process 
unit (tons).
Creducing agenti = Carbon content in reducing agent i 
(percent by weight, expressed as a decimal fraction).
Melectrodem = Annual mass of carbon electrode m consumed 
in the calcium carbide process unit (tons).
Celectrodem = Carbon content of the carbon electrode m 
(percent by weight, expressed as a decimal fraction).
Mproduct outgoingk = Annual mass of alloy product k 
tapped from the calcium carbide process unit (tons).
Cproduct outgoingk = Carbon content in alloy product k 
(percent by weight, expressed as a decimal fraction).
Mnon-product outgoingl = Annual mass of non-product 
outgoing material l removed from the calcium carbide unit (tons).
Cnon-product outgoingl = Carbon content in non-product 
outgoing material l (percent by weight, expressed as a decimal 
fraction).

    (2) Determine the combined annual process CO2 emissions 
from the calcium carbide process units at your facility using Equation 
XX-2 of this section.
[GRAPHIC] [TIFF OMITTED] TP22MY23.019

Where:

CO2 = Annual process CO2 emissions from 
calcium carbide process units at a facility used for the production 
of calcium carbide (metric tons).
ECO2k = Annual process CO2 emissions 
calculated from calcium carbide process unit k calculated using 
Equation XX-1 of this section (metric tons).
k = Total number of calcium carbide process units at facility.

    (c) If all GHG emissions from a calcium carbide process unit are 
vented through the same stack as any combustion unit or process 
equipment that reports CO2 emissions using a CEMS that 
complies with the Tier 4 Calculation Methodology in subpart C of this 
part (General Stationary Fuel Combustion Sources), then the calculation 
methodology in paragraph (b) of this section must not be used to 
calculate process emissions. The owner or operator must report under 
this subpart the combined stack emissions according to the Tier 4 
Calculation Methodology in Sec.  98.33(a)(4) and all associated 
requirements for Tier 4 in subpart C of this part.

Sec.  98.504  Monitoring and QA/QC requirements.

    If you determine annual process CO2 emissions using the 
carbon mass balance procedure in Sec.  98.503(b), you must meet the 
requirements specified in paragraphs (a) and (b) of this section.
    (a) Determine the annual mass for each material used for the 
calculations of annual process CO2 emissions using Equation 
XX-1 of this subpart by summing the monthly mass for the material 
determined for each month of the calendar year. The monthly mass may be 
determined using plant instruments used for accounting purposes, 
including either direct measurement of the quantity of the material 
placed in the unit or by calculations using process operating 
information.
    (b) For each material identified in paragraph (a) of this section, 
you must determine the average carbon content of the material consumed, 
used, or produced in the calendar year using the methods specified in 
either paragraph (b)(1) or (2) of this section. If you document that a 
specific process input or output contributes less than one percent of 
the total mass of carbon into or out of the process, you do not have to 
determine the monthly mass or annual carbon content of that input or 
output.
    (1) Information provided by your material supplier.
    (2) Collecting and analyzing at least three representative samples 
of the material inputs and outputs each year. The carbon content of the 
material must be analyzed at least annually using the standard methods 
(and their QA/QC procedures) specified in paragraphs (b)(2)(i) and (ii) 
of this section, as applicable.
    (i) ASTM D5373-08 Standard Test Methods for Instrumental 
Determination of Carbon, Hydrogen, and Nitrogen in Laboratory Samples 
of Coal (incorporated by reference, see Sec.  98.7), for analysis of 
carbonaceous reducing agents and carbon electrodes.
    (ii) ASTM C25-06, Standard Test Methods for Chemical Analysis of 
Limestone, Quicklime, and Hydrated Lime (incorporated by reference, see 
Sec.  98.7) for analysis of materials such as limestone or dolomite.

Sec.  98.505  Procedures for estimating missing data.

    A complete record of all measured parameters used in the GHG 
emissions calculations in Sec.  98.503 is required. Therefore, whenever 
a quality-assured value of a required parameter is unavailable, a 
substitute data value for the missing parameter must be used in the 
calculations as specified in the paragraphs (a) and (b) of this 
section. You must document and keep records of the procedures used for 
all such estimates.

[[Page 32942]]

    (a) If you determine CO2 emissions for the calcium 
carbide process unit at your facility using the carbon mass balance 
procedure in Sec.  98.503(b), 100 percent data availability is required 
for the carbon content of the input and output materials. You must 
repeat the test for average carbon contents of inputs according to the 
procedures in Sec.  98.504(b) if data are missing.
    (b) For missing records of the monthly mass of carbon-containing 
inputs and outputs, the substitute data value must be based on the best 
available estimate of the mass of the inputs and outputs from all 
available process data or data used for accounting purposes, such as 
purchase records.

Sec.  98.506  Data reporting requirements.

    In addition to the information required by Sec.  98.3(c), each 
annual report must contain the information specified in paragraphs (a) 
through (h) of this section, as applicable:
    (a) Annual facility calcium carbide production capacity (tons).
    (b) The annual facility production of calcium carbide (tons).
    (c) Total number of calcium carbide process units at facility used 
for production of calcium carbide.
    (d) Annual facility consumption of petroleum coke (tons).
    (e) Each end use of any calcium carbide produced and sent off site.
    (f) If the facility produces acetylene on site, provide the 
information in paragraphs (f)(1), (2), and (3) of this section.
    (1) The annual production of acetylene at the facility (tons).
    (2) The annual quantity of calcium carbide used for the production 
of acetylene at the facility (tons).
    (3) Each end use of any acetylene produced on-site.
    (g) If a CEMS is used to measure CO2 emissions, then you 
must report under this subpart the relevant information required by 
Sec.  98.36 for the Tier 4 Calculation Methodology and the information 
specified in paragraphs (g)(1) and (2) of this section.
    (1) Annual CO2 emissions (in metric tons) from each 
calcium carbide process unit.
    (2) Identification number of each process unit.
    (h) If a CEMS is not used to measure CO2 process 
emissions, and the carbon mass balance procedure is used to determine 
CO2 emissions according to the requirements in Sec.  
98.503(b), then you must report the information specified in paragraphs 
(h)(1) through (3) of this section.
    (1) Annual process CO2 emissions (in metric tons) from 
each calcium carbide process unit.
    (2) List the method used for the determination of carbon content 
for each input and output material included in the calculation of 
annual process CO2 emissions for each calcium carbide 
process unit (e.g., supplier provided information, analyses of 
representative samples you collected).
    (3) If you use the missing data procedures in Sec.  98.505(b), you 
must report for each calcium carbide production process unit how 
monthly mass of carbon-containing inputs and outputs with missing data 
were determined and the number of months the missing data procedures 
were used.

Sec.  98.507  Records that must be retained.

    In addition to the records required by Sec.  98.3(g), you must 
retain the records specified in paragraphs (a) through (d) of this 
section for each calcium carbide process unit, as applicable.
    (a) If a CEMS is used to measure CO2 emissions according 
to the requirements in Sec.  98.503(a), then you must retain under this 
subpart the records required for the Tier 4 Calculation Methodology in 
Sec.  98.37 and the information specified in paragraphs (a)(1) through 
(3) of this section.
    (1) Monthly calcium carbide process unit production quantity 
(tons).
    (2) Number of calcium carbide processing unit operating hours each 
month.
    (3) Number of calcium carbide processing unit operating hours in a 
calendar year.
    (b) If the carbon mass balance procedure is used to determine 
CO2 emissions according to the requirements in Sec.  
98.503(b)(2), then you must retain records for the information 
specified in paragraphs (b)(1) through (5) of this section.
    (1) Monthly calcium carbide process unit production quantity 
(tons).
    (2) Number of calcium carbide process unit operating hours each 
month.
    (3) Number of calcium carbide process unit operating hours in a 
calendar year.
    (4) Monthly material quantity consumed, used, or produced for each 
material included for the calculations of annual process CO2 
emissions (tons).
    (5) Average carbon content determined and records of the supplier 
provided information or analyses used for the determination for each 
material included for the calculations of annual process CO2 
emissions.
    (c) You must keep records that include a detailed explanation of 
how company records of measurements are used to estimate the carbon 
input and output to each calcium carbide process unit, including 
documentation of specific input or output materials excluded from 
Equation XX-1 of this subpart that contribute less than 1 percent of 
the total carbon into or out of the process. You also must document the 
procedures used to ensure the accuracy of the measurements of materials 
fed, charged, or placed in a calcium carbide process unit including, 
but not limited to, calibration of weighing equipment and other 
measurement devices. The estimated accuracy of measurements made with 
these devices must also be recorded, and the technical basis for these 
estimates must be provided.
    (d) Verification software records. You must keep a record of the 
file generated by the verification software specified in Sec.  98.5(b) 
for the applicable data specified in paragraphs (d)(1) through (13) of 
this section. Retention of this file satisfies the recordkeeping 
requirement for the data in paragraphs (d)(1) through (8) of this 
section.
    (1) Carbon content in reducing agent (percent by weight, expressed 
as a decimal fraction) (Equation XX-1 of Sec.  98.503).
    (2) Annual mass of reducing agent fed, charged, or otherwise 
introduced into the calcium carbide process unit (tons) (Equation XX-
1).
    (3) Carbon content of carbon electrode (percent by weight, 
expressed as a decimal fraction) (Equation XX-1).
    (4) Annual mass of carbon electrode consumed in the calcium carbide 
process unit (tons) (Equation XX-1).
    (5) Carbon content in product (percent by weight, expressed as a 
decimal fraction) (Equation XX-1).
    (6) Annual mass of product produced/tapped in the calcium carbide 
process unit (tons) (Equation XX-1).
    (7) Carbon content in non-product outgoing material (percent by 
weight, expressed as a decimal fraction) (Equation XX-1).
    (8) Annual mass of non-product outgoing material removed from 
calcium carbide process unit (tons) (Equation XX-1).

Sec.  98.508  Definitions.

    All terms used of this subpart have the same meaning given in the 
Clean Air Act and subpart A of this part.
0
47. Add subpart YY to read as follows:
Subpart YY--Caprolactam, Glyoxal, and Glyoxylic Acid Production
Sec.
98.510 Definition of source category.
98.511 Reporting threshold.
98.512 GHGs to report.
98.513 Calculating GHG emissions.
98.514 Monitoring and QA/QC requirements.

[[Page 32943]]

98.515 Procedures for estimating missing data.
98.516 Data reporting requirements.
98.517 Records that must be retained.
98.518 Definitions.

Sec.  98.510  Definition of source category.

    This source category includes any facility that produces 
caprolactam, glyoxal, or glyoxylic acid. This source category excludes 
the production of glyoxal through the LaPorte process (i.e., the gas-
phase catalytic oxidation of ethylene glycol with air in the presence 
of a silver or copper catalyst).

Sec.  98.511  Reporting threshold.

    You must report GHG emissions under this subpart if your facility 
meets the requirements of either Sec.  98.2(a)(1) or (2) and the 
definition of source category in Sec.  98.510.

Sec.  98.512  GHGs to report.

    (a) You must report N2O process emissions from the 
production of caprolactam, glyoxal, and glyoxylic acid as required by 
this subpart.
    (b) You must report under subpart C of this part (General 
Stationary Fuel Combustion Sources) the emissions of CO2, 
CH4, and N2O from each stationary combustion unit 
by following the requirements of subpart C.

Sec.  98.513  Calculating GHG emissions.

    (a) You must determine annual N2O process emissions from 
each caprolactam, glyoxal, and glyoxylic acid process line using the 
appropriate default N2O generation factor(s) from Table YY-1 
to this subpart, the site-specific N2O destruction factor(s) 
for each N2O abatement device, and site-specific production 
data according to paragraphs (b) through (e) of this section.
    (b) You must determine the total annual amount of product i 
(caprolactam, glyoxal, or glyoxylic acid) produced on each process line 
t (metric tons product), according to Sec.  98.514(b).
    (c) If process line t exhausts to any N2O abatement 
technology j, you must determine the destruction efficiency for each 
N2O abatement technology according to paragraph (c)(1) or 
(2) of this section.
    (1) Use the control device manufacturer's specified destruction 
efficiency.
    (2) Estimate the destruction efficiency through process knowledge. 
Examples of information that could constitute process knowledge include 
calculations based on material balances, process stoichiometry, or 
previous test results provided the results are still relevant to the 
current vent stream conditions. You must document how process knowledge 
(if applicable) was used to determine the destruction efficiency.
    (d) If process line t exhausts to any N2O abatement 
technology j, you must determine the abatement utilization factor for 
each N2O abatement technology according to paragraph (d)(1) 
or (2) of this section.
    (1) If the abatement technology j has no downtime during the year, 
use 1.
    (2) If the abatement technology j was not operational while product 
i was being produced on process line t, calculate the abatement 
utilization factor according to Equation YY-1 of this subpart.
[GRAPHIC] [TIFF OMITTED] TP22MY23.020

Where:

AFj = Monthly abatement utilization factor of 
N2O abatement technology j from process unit t (fraction 
of time that abatement technology is operating).
Ti = Total number of hours during month that product i 
(caprolactam, glyoxal, or glyoxylic acid), was produced from process 
unit t (hours).
Ti,j = Total number of hours during month that product i 
(caprolactam, glyoxal, or glyoxylic acid), was produced from process 
unit t during which N2O abatement technology j was 
operational (hours).

    (e) You must calculate N2O emissions for each product i 
from each process line t and each N2O control technology j 
according to Equation YY-2 of this subpart.
[GRAPHIC] [TIFF OMITTED] TP22MY23.021

Where:

EN2Ot = Monthly process emissions of N2O, 
metric tons (mt) from process line t.
EFi = N2O generation factor for product i 
(caprolactam, glyoxal, or glyoxylic acid), kg N2O/mt of 
product produced, as shown in Table YY-1 to this subpart.
Pi = Monthly production of product i, (caprolactam, 
glyoxal, or glyoxylic acid), mt.
DEj = Destruction efficiency of N2O abatement 
technology type j, fraction (decimal fraction of N2O 
removed from vent stream).
AFj = Monthly abatement utilization factor for 
N2O abatement technology type j, fraction, calculated 
using Equation YY-1 of this subpart.
0.001 = Conversion factor from kg to metric tons.

Sec.  98.514  Monitoring and QA/QC requirements.

    (a) You must determine the total monthly amount of caprolactam, 
glyoxal, and glyoxylic acid produced. These monthly amounts are 
determined according to the methods in paragraph (a)(1) or (2) of this 
section.
    (1) Direct measurement of production (such as using flow meters, 
weigh scales, etc.).
    (2) Existing plant procedures used for accounting purposes (i.e., 
dedicated tank-level and acid concentration measurements).
    (b) You must determine the annual amount of caprolactam, glyoxal, 
and glyoxylic acid produced. These annual amounts are determined by 
summing the respective monthly quantities determined in paragraph (a) 
of this section.

Sec.  98.515  Procedures for estimating missing data.

    A complete record of all measured parameters used in the GHG 
emissions calculations is required. Therefore, whenever a quality-
assured value of a required parameter is unavailable, a substitute data 
value for the missing parameter must be used in the calculations as 
specified in paragraphs (a) and (b) of this section.
    (a) For each missing value of caprolactam, glyoxal, or glyoxylic 
acid production, the substitute data must be the best available 
estimate based on all available process data or data used for 
accounting purposes (such as sales records).
    (b) For missing values related to the N2O abatement 
device, assuming that the operation is generally constant from year to 
year, the substitute data value should be the most recent quality-
assured value.

Sec.  98.516  Data reporting requirements.

    In addition to the information required by Sec.  98.3(c), each 
annual report must contain the information specified in paragraphs (a) 
through (j) of this section.
    (a) Process line identification number.
    (b) Annual process N2O emissions from each process line 
according to paragraphs (b)(1) through (3) of this section.
    (1) N2O from caprolactam production (metric tons).

[[Page 32944]]

    (2) N2O from glyoxal production (metric tons).
    (3) N2O from glyoxylic acid production (metric tons).
    (c) Annual production quantities from all process lines at the 
caprolactam, glyoxal, or glyoxylic acid production facility according 
to paragraphs (c)(1) through (3) of this section.
    (1) Caprolactam production (metric tons).
    (2) Glyoxal production (metric tons).
    (3) Glyoxylic acid production (metric tons).
    (d) Annual production capacity from all process lines at the 
caprolactam, glyoxal, or glyoxylic acid production facility, as 
applicable, in paragraphs (d)(1) through (3) of this section.
    (1) Caprolactam production capacity (metric tons).
    (2) Glyoxal production capacity (metric tons).
    (3) Glyoxylic acid production capacity (metric tons).
    (e) Number of process lines at the caprolactam, glyoxal, or 
glyoxylic acid production facility, by product, in paragraphs (e)(1) 
through (3) of this section.
    (1) Total number of process lines producing caprolactam.
    (2) Total number of process lines producing glyoxal.
    (3) Total number of process lines producing glyoxylic acid.
    (f) Number of operating hours in the calendar year for each process 
line at the caprolactam, glyoxal, or glyoxylic acid production facility 
(hours).
    (g) N2O abatement technologies used (if applicable) and 
date of installation of abatement technology at the caprolactam, 
glyoxal, or glyoxylic acid production facility.
    (h) Monthly abatement utilization factor for each N2O 
abatement technology at the caprolactam, glyoxal, or glyoxylic acid 
production facility.
    (i) Number of times in the reporting year that missing data 
procedures were followed to measure production quantities of 
caprolactam, glyoxal, or glyoxylic acid (months).
    (j) Annual percent N2O emission reduction per chemical 
produced at the caprolactam, glyoxal, or glyoxylic acid production 
facility, as applicable, in paragraphs (j)(1) through (3) of this 
section.
    (1) Annual percent N2O emission reduction for 
caprolactam production.
    (2) Annual percent N2O emission reduction for glyoxal 
production.
    (3) Annual percent N2O emission reduction for glyoxylic 
acid production.

Sec.  98.517  Records that must be retained.

    In addition to the information required by Sec.  98.3(g), you must 
retain the records specified in paragraphs (a) through (d) of this 
section for each caprolactam, glyoxal, or glyoxylic acid production 
facility:
    (a) Documentation of how accounting procedures were used to 
estimate production rate.
    (b) Documentation of how process knowledge was used to estimate 
abatement technology destruction efficiency (if applicable).
    (c) Documentation of the procedures used to ensure the accuracy of 
the measurements of all reported parameters, including but not limited 
to, calibration of weighing equipment, flow meters, and other 
measurement devices. The estimated accuracy of measurements made with 
these devices must also be recorded, and the technical basis for these 
estimates must be provided.
    (d) You must keep a record of the file generated by the 
verification software specified in Sec.  98.5(b) for the applicable 
data specified in paragraphs (d)(1) through (3) of this section. 
Retention of this file satisfies the recordkeeping requirement for the 
data in paragraphs (d)(1) through (3) of this section.
    (1) Monthly production quantity of caprolactam from all process 
lines at the caprolactam, glyoxal, or glyoxylic acid production 
facility.
    (2) Monthly production quantity of glyoxal from all process lines 
at the caprolactam, glyoxal, or glyoxylic acid production facility.
    (3) Monthly production quantity of glyoxylic acid from all process 
lines at the caprolactam, glyoxal, or glyoxylic acid production 
facility.

Sec.  98.518  Definitions.

    All terms used in this subpart have the same meaning given in the 
Clean Air Act and subpart A of this part.

       Table YY-1 to Subpart YY of Part 98--N2O Generation Factors
------------------------------------------------------------------------
                                                         N2O generation
                        Product                            factor \a\
 
------------------------------------------------------------------------
Caprolactam...........................................               9.0
Glyoxal...............................................             5,200
Glyoxylic acid........................................             1,000
------------------------------------------------------------------------
\a\ Generation factors in units of kilograms of N2O emitted per metric
  ton of product produced.

0
48. Add subpart ZZ to read as follows:
Subpart ZZ--Ceramics Manufacturing
Sec.
98.520 Definition of the source category.
98.521 Reporting threshold.
98.522 GHGs to report.
98.523 Calculating GHG emissions.
98.524 Monitoring and QA/QC requirements.
98.525 Procedures for estimating missing data.
98.526 Data reporting requirements.
98.527 Records that must be retained.
98.528 Definitions.

Sec.  98.520  Definition of the source category.

    (a) The ceramics manufacturing source category consists of any 
facility that uses nonmetallic, inorganic materials, many of which are 
clay-based, to produce ceramic products such as bricks and roof tiles, 
wall and floor tiles, table and ornamental ware (household ceramics), 
sanitary ware, refractory products, vitrified clay pipes, expanded clay 
products, inorganic bonded abrasives, and technical ceramics (e.g., 
aerospace, automotive, electronic, or biomedical applications). For the 
purposes of this subpart, ceramics manufacturing processes include 
facilities that annually consume at least 2,000 tons of carbonates or 
20,000 tons of clay, which is heated to a temperature sufficient to 
allow the calcination reaction to occur, and operate a ceramics 
manufacturing process unit.
    (b) A ceramics manufacturing process unit is a kiln, dryer, or oven 
used to calcine clay or other carbonate-based materials for the 
production of a ceramics product.

Sec.  98.521  Reporting threshold.

    You must report GHG emissions under this subpart if your facility 
contains a ceramics manufacturing process and the facility meets the 
requirements of either Sec.  98.2(a)(1) or (2).

Sec.  98.522  GHGs to report.

    You must report:
    (a) CO2 process emissions from each ceramics process 
unit (e.g., kiln, dryer, or oven).
    (b) CO2 combustion emissions from each ceramics process 
unit.
    (c) CH4 and N2O combustion emissions from 
each ceramics process unit. You must calculate and report these 
emissions under subpart C of this part (General Stationary Fuel 
Combustion Sources) by following the requirements of subpart C of this 
part.
    (d) CO2, CH4, and N2O combustion 
emissions from each stationary fuel combustion unit other than kilns, 
dryers, or ovens. You must report these emissions under subpart C of 
this part (General Stationary Fuel Combustion Sources) by following the 
requirements of subpart C of this part.

Sec.  98.523  Calculating GHG emissions.

    You must calculate and report the annual process CO2 
emissions from each ceramics process unit using the procedures in 
paragraphs (a) through (c) of this section.

[[Page 32945]]

    (a) For each ceramics process unit that meets the conditions 
specified in Sec.  98.33(b)(4)(ii) or (iii), you must calculate and 
report under this subpart the combined process and combustion 
CO2 emissions by operating and maintaining a CEMS to measure 
CO2 emissions according to the Tier 4 Calculation 
Methodology specified in Sec.  98.33(a)(4) and all associated 
requirements for Tier 4 in subpart C of this part (General Stationary 
Fuel Combustion Sources).
    (b) For each ceramics process unit that is not subject to the 
requirements in paragraph (a) of this section, calculate and report the 
process and combustion CO2 emissions from the ceramics 
process unit separately by using the procedures specified in paragraphs 
(b)(1) through (6) of this section, except as specified in paragraph 
(c) of this section.
    (1) For each carbonate-based raw material charged to the ceramics 
process unit, either obtain the mass fractions of any carbonate-based 
minerals from the supplier of the raw material or by sampling the raw 
material, or use a default value of 1.0 as the mass fraction for the 
raw material.
    (2) Determine the quantity of each carbonate-based raw material 
charged to the ceramics process unit.
    (3) Apply the appropriate emission factor for each carbonate-based 
raw material charged to the ceramics process unit. Table ZZ-1 to this 
subpart provides emission factors based on stoichiometric ratios for 
carbonate-based minerals.
    (4) Use Equation ZZ-1 of this section to calculate process mass 
emissions of CO2 for each ceramics process unit:
[GRAPHIC] [TIFF OMITTED] TP22MY23.022

Where:

ECO2 = Annual process CO2 emissions (metric 
tons/year).
MFi = Annual average decimal mass fraction of carbonate-
based mineral i in carbonate-based raw material j.
Mj = Annual mass of the carbonate-based raw material j 
consumed (tons/year).
2000/2205 = Conversion factor to convert tons to metric tons.
EFi = Emission factor for the carbonate-based mineral i, 
(metric tons CO2/metric ton carbonate, see Table ZZ-1 of 
this subpart).
Fi = Decimal fraction of calcination achieved for 
carbonate-based mineral i, assumed to be equal to 1.0.
i = Index for carbonate-based mineral in each carbonate-based raw 
material.
j = Index for carbonate-based raw material.

    (5) Determine the combined annual process CO2 emissions 
from the ceramic process units at your facility using Equation ZZ-2 of 
this subpart:
[GRAPHIC] [TIFF OMITTED] TP22MY23.023

Where:

CO2 = Annual process CO2 emissions from 
ceramic process units at a facility (metric tons).
ECO2k = Annual process CO2 emissions 
calculated from ceramic process unit k calculated using Equation ZZ-
1 of this subpart (metric tons).
k = Total number of ceramic process units at facility.

    (6) Calculate and report under subpart C of this part (General 
Stationary Fuel Combustion Sources) the combustion CO2 
emissions in the ceramics process unit according to the applicable 
requirements in subpart C of this part.
    (c) As an alternative to data provided by either the raw material 
supplier or a lab analysis, a value of 1.0 can be used for the mass 
fraction (MFi) of carbonate-based mineral i in each 
carbonate-based raw material j in Equation ZZ-1 of this subpart. The 
use of 1.0 for the mass fraction assumes that the carbonate-based raw 
material comprises 100% of one carbonate-based mineral.

Sec.  98.524  Monitoring and QA/QC requirements.

    (a) You must measure annual amounts of carbonate-based raw 
materials charged to each ceramics process unit from monthly 
measurements using plant instruments used for accounting purposes, such 
as calibrated scales or weigh hoppers. Total annual mass charged to 
ceramics process units at the facility must be compared to records of 
raw material purchases for the year.
    (b) Unless you use the default value of 1.0 for the mass fraction 
of a carbonate-based mineral, you must measure carbonate-based mineral 
mass fractions at least annually to verify the mass fraction data 
provided by the supplier of the raw material; such measurements must be 
based on sampling and chemical analysis using consensus standards that 
specify X-ray fluorescence.
    (c) Unless you use the default value of 1.0 for the mass fraction 
of a carbonate-based mineral, you must determine the annual average 
mass fraction for the carbonate-based mineral in each carbonate-based 
raw material by calculating an arithmetic average of the monthly data 
obtained from raw material suppliers or sampling and chemical analysis.
    (d) Unless you use the default value of 1.0 for the calcination 
fraction of a carbonate-based mineral, you must determine on an annual 
basis the calcination fraction for each carbonate-based mineral 
consumed based on sampling and chemical analysis using an industry 
consensus standard. If performed, this chemical analysis must be 
conducted using an x-ray fluorescence test or other enhanced testing 
method published by an industry consensus standards organization (e.g., 
ASTM, ASME, API, etc.).

Sec.  98.525  Procedures for estimating missing data.

    A complete record of all measured parameters used in the GHG 
emissions calculations in Sec.  98.523 is required. If the monitoring 
and quality assurance procedures in Sec.  98.524 cannot be followed and 
data is unavailable, you must use the most appropriate of the missing 
data procedures in paragraphs (a) and (b) of this section in the 
calculations. You must document and keep records of the procedures used 
for all such missing value estimates.
    (a) If the CEMS approach is used to determine combined process and 
combustion CO2 emissions, the missing data procedures in 
Sec.  98.35 apply.
    (b) For missing data on the monthly amounts of carbonate-based raw 
materials charged to any ceramics process unit, use the best available 
estimate(s) of the parameter(s) based on all available process data or 
data used for accounting purposes, such as purchase records.
    (c) For missing data on the mass fractions of carbonate-based 
minerals in the carbonate-based raw materials, assume that the mass 
fraction of a carbonate-based mineral is 1.0, which assumes that one 
carbonate-based mineral comprises 100 percent of the carbonate-based 
raw material.

Sec.  98.526  Data reporting requirements.

    In addition to the information required by Sec.  98.3(c), each 
annual report must contain the information specified in paragraphs (a) 
through (c) of this section, as applicable:
    (a) The total number of ceramics process units at the facility and 
the number of units that operated during the reporting year.

[[Page 32946]]

    (b) If a CEMS is used to measure CO2 emissions from 
ceramics process units, then you must report under this subpart the 
relevant information required under Sec.  98.36 for the Tier 4 
Calculation Methodology and the following information specified in 
paragraphs (b)(1) through (3) of this section.
    (1) The annual quantity of each carbonate-based raw material 
charged to each ceramics process unit and for all units combined 
(tons).
    (2) Annual quantity of each type of ceramics product manufactured 
by each ceramics process unit and by all units combined (tons).
    (3) Annual production capacity for each ceramics process unit 
(tons).
    (c) If a CEMS is not used to measure CO2 emissions from 
ceramics process units and process CO2 emissions are 
calculated according to the procedures specified in Sec.  98.523(b), 
then you must report the following information specified in paragraphs 
(c)(1) through (7) of this section.
    (1) Annual process emissions of CO2 (metric tons) for 
each ceramics process unit and for all units combined.
    (2) The annual quantity of each carbonate-based raw material 
charged to all units combined (tons).
    (3) Results of all tests used to verify each carbonate-based 
mineral mass fraction for each carbonate-based raw material charged to 
a ceramics process unit, as specified in paragraphs (c)(3)(i) through 
(iii) of this section.
    (i) Date of test.
    (ii) Method(s) and any variations used in the analyses.
    (iii) Mass fraction of each sample analyzed.
    (4) Method used to determine the decimal mass fraction of 
carbonate-based mineral, unless you used the default value of 1.0 
(e.g., supplier provided information, analyses of representative 
samples you collected).
    (5) Annual quantity of each type of ceramics product manufactured 
by each ceramics process unit and by all units combined (tons).
    (6) Annual production capacity for each ceramics process unit 
(tons).
    (7) If you use the missing data procedures in Sec.  98.525(b), you 
must report for each applicable ceramics process unit the number of 
times in the reporting year that missing data procedures were followed 
to measure monthly quantities of carbonate-based raw materials or mass 
fraction of the carbonate-based minerals (months).

Sec.  98.527  Records that must be retained.

    In addition to the records required by Sec.  98.3(g), you must 
retain the records specified in paragraphs (a) through (d) of this 
section for each ceramics process unit, as applicable.
    (a) If a CEMS is used to measure CO2 emissions according 
to the requirements in Sec.  98.523(a), then you must retain under this 
subpart the records required under Sec.  98.37 for the Tier 4 
Calculation Methodology and the information specified in paragraphs 
(a)(1) and (2) of this section.
    (1) Monthly ceramics production rate for each ceramics process unit 
(tons).
    (2) Monthly amount of each carbonate-based raw material charged to 
each ceramics process unit (tons).
    (b) If process CO2 emissions are calculated according to 
the procedures specified in Sec.  98.523(b), you must retain the 
records in paragraphs (b)(1) through (6) of this section.
    (1) Monthly ceramics production rate for each ceramics process unit 
(metric tons).
    (2) Monthly amount of each carbonate-based raw material charged to 
each ceramics process unit (metric tons).
    (3) Data on carbonate-based mineral mass fractions provided by the 
raw material supplier for all raw materials consumed annually and 
included in calculating process emissions in Equation ZZ-1 of this 
subpart, if applicable.
    (4) Results of all tests, if applicable, used to verify the 
carbonate-based mineral mass fraction for each carbonate-based raw 
material charged to a ceramics process unit, including the data 
specified in paragraphs (b)(4)(i) through (v) of this section.
    (i) Date of test.
    (ii) Method(s), and any variations of methods, used in the 
analyses.
    (iii) Mass fraction of each sample analyzed.
    (iv) Relevant calibration data for the instrument(s) used in the 
analyses.
    (v) Name and address of laboratory that conducted the tests.
    (5) Each carbonate-based mineral mass fraction for each carbonate-
based raw material, if a value other than 1.0 is used to calculate 
process mass emissions of CO2.
    (6) Number of annual operating hours of each ceramics process unit.
    (c) All other documentation used to support the reported GHG 
emissions.
    (d) Verification software records. You must keep a record of the 
file generated by the verification software specified in Sec.  98.5(b) 
for the applicable data specified in paragraphs (d)(1) through (3) of 
this section. Retention of this file satisfies the recordkeeping 
requirement for the data in paragraphs (d)(1) through (3) of this 
section.
    (1) Annual average decimal mass fraction of each carbonate-based 
mineral in each carbonate-based raw material for each ceramics process 
unit (specify the default value, if used, or the value determined 
according to Sec.  98.524) (percent by weight, expressed as a decimal 
fraction) (Equation ZZ-1 of Sec.  98.523).
    (2) Annual mass of each carbonate-based raw material charged to 
each ceramics process unit (tons) (Equation ZZ-1 of this subpart).
    (3) Decimal fraction of calcination achieved for each carbonate-
based raw material for each ceramics process unit (specify the default 
value, if used, or the value determined according to Sec.  98.524) 
(percent by weight, expressed as a decimal fraction) (Equation ZZ-1 of 
this subpart).

Sec.  98.528  Definitions.

    All terms used of this subpart have the same meaning given in the 
Clean Air Act and subpart A of this part.

Table ZZ-1 to Subpart ZZ of Part 98--CO2 Emission Factors for Carbonate-
                           Based Raw Materials
------------------------------------------------------------------------
                                                 CO2 emission factor \a\
          Carbonate            Mineral name(s)
------------------------------------------------------------------------
BaCO3........................  Witherite,                          0.223
                                Barium
                                carbonate.
CaCO3........................  Limestone,                          0.440
                                Calcium
                                Carbonate,
                                Calcite,
                                Aragonite.
Ca(Fe,Mg,Mn)(CO3)2...........  Ankerite \b\...               0.408-0.476
CaMg(CO3)2...................  Dolomite.......                     0.477
FeCO3........................  Siderite.......                     0.380
K2CO3........................  Potassium                           0.318
                                carbonate.
Li2CO3.......................  Lithium                             0.596
                                carbonate.
MgCO3........................  Magnesite......                     0.522
MnCO3........................  Rhodochrosite..                     0.383
Na2CO3.......................  Sodium                              0.415
                                carbonate,
                                Soda ash.

[[Page 32947]]

 
SrCO3........................  Strontium                           0.298
                                carbonate,
                                Strontianite.
------------------------------------------------------------------------
\a\ Emission factors are in units of metric tons of CO2 emitted per
  metric ton of carbonate-based mineral.
\b\ Ankerite emission factors are based on a formula weight range that
  assumes Fe, Mg, and Mn are present in amounts of at least 1.0 percent.

[FR Doc. 2023-10047 Filed 5-19-23; 8:45 am]
BILLING CODE 6560-50-P