EPA Determinations of Compliance and Applicability Under Clean Air Act Section 111, 112, and 129 Dashboard: EPA Formal Responses to Inquiries Concerning Compliance With the Clean Air Act Stationary Source Program (Since May 2019)

ENVIRONMENTAL PROTECTION AGENCY

[EPA-HQ-OAR-2025-0486; FRL-12870-01-OAR]

EPA Determinations of Compliance and Applicability Under Clean Air Act Section 111, 112, and 129 Dashboard: EPA Formal Responses to Inquiries Concerning Compliance With the Clean Air Act Stationary Source Program (Since May 2019)

AGENCY:

Environmental Protection Agency (EPA).

ACTION:

Notice of availability.

SUMMARY:

This document announces the availability of applicability determinations, alternative monitoring decisions, and regulatory interpretations made by the Environmental Protection Agency (EPA) with regard to the New Source Performance Standards (NSPS); the National Emission Standards for Hazardous Air Pollutants (NESHAP); the Emission Guidelines and Federal Plan Requirements for existing sources; and/or the Stratospheric Ozone Protection Program.

FOR FURTHER INFORMATION CONTACT:

For questions about the Clean Air Act (CAA) section 111, 112, and 129 Dashboard or this document, contact Diana Felix, Air Quality Policy Division, Operating Permits Group; telephone number: (919) 541-7627; email address:

felix.diana@epa.gov.

An electronic copy of each complete document posted on the CAA section 111, 112, and 129 Dashboard, which contains determinations signed after May 2019, is available on the internet through the Resources and Guidance Documents for Compliance Assistance page of the CAA Compliance Monitoring website under “Air” at:

https://www.epa.gov/complying-air-emissions-standards-stationary-sources/epa-determinations-compliance-and.

All previously issued responses are posted on the Applicability Determination Index (ADI) data system available on the internet through the Resources and Guidance Documents for Compliance Assistance page of the CAA Compliance Monitoring website under “Air” at:

https://www.epa.gov/compliance/resources-and-guidance-documents-compliance-assistance.

The letters and memoranda on the CAA section 111, 112, and 129 Dashboard may be located by facility name, affected subpart, or by response date and is searchable by string word searches.

SUPPLEMENTARY INFORMATION:

General Information

The General Provisions of the NSPS in 40 Code of Federal Regulations (CFR) part 60 and the General Provisions of the NESHAP in 40 CFR part 61 provide that a source owner or operator may request a determination of whether certain intended actions constitute the commencement of construction, reconstruction, or modification. 40 CFR 60.5 and 61.06. The General Provisions in part 60 also apply to Federal and EPA-approved state plans for existing sources in 40 CFR part 62.

See

40 CFR 62.02(b)(2). The EPA's written responses to source or facility-specific inquiries on provisions in parts 60, 61 and 62 are commonly referred to as applicability determinations. Although the NESHAP part 63 regulations [which include Maximum Achievable Control Technology (MACT) standards and/or Generally Available Control Technology (GACT) standards] contain no specific regulatory provision providing that sources may request applicability determinations, the EPA also responds to written inquiries regarding applicability for the 40 CFR part 63 regulations. In addition, the General Provisions in parts 60 and 63 allow sources to seek permission to use monitoring or recordkeeping that is different from the promulgated requirements.

See

40 CFR 60.13(i), 61.14(g), 63.8(b)(1), 63.8(f), and 63.10(f). The EPA's written responses to these inquiries are commonly referred to as alternative monitoring decisions. Furthermore, the EPA responds to written inquiries about the broad range of regulatory requirements in 40 CFR parts 60 through 63 as they pertain to a whole source category. These inquiries may pertain, for example, to the type of sources to which the regulation applies, or to the testing, monitoring, recordkeeping, or reporting requirements contained in the regulation. The EPA's written responses to these inquiries are commonly referred to as regulatory interpretations.

The EPA previously compiled EPA-issued NSPS and NESHAP applicability determinations, alternative monitoring decisions, and regulatory interpretations, and posted them to the ADI. As of October 2, 2023, the EPA determinations of compliance and applicability under CAA section 111, 112, and 129 will be posted to the CAA section 111, 112, and 129 Dashboard. The CAA section 111, 112, and 129 Dashboard is a data system, accessed via the internet, containing all determinations signed after May 2019.

This document comprises a list of 62 such documents added to the CAA section 111, 112, and 129 Dashboard on June 25, 2025. This document lists the title of each letter and memorandum. Complete copies of these documents may be obtained from the CAA section 111, 112 and 129 Dashboard on the internet through the Resources and Guidance Documents for Compliance Assistance page of the CAA Compliance Monitoring website under “Air” at:

https://www.epa.gov/compliance/resources-and-guidance-documents-compliance-assistance.

Applicability Determinations, Alternative Monitoring Plans and Regulatory Interpretations Uploaded to CAA Section 111, 112, and 129 Dashboard on June 25, 2025

Facility name

Title

Affected subpart

Date of response

ANR Pipeline Company Sulphur Springs and LaGrange Compressor Stations

Alternative Monitoring for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2025-06-13

Eagle Butte Co-op Incinerator

Applicability Determination for Commercial and Industrial Solid Waste Incineration Units

40 CFR part 60, subpart CCCC

2025-05-28

Gulf South Pipeline Company, LLC—McComb Compressor Station

Alternative Monitoring for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2025-05-19

North Omaha Station

Performance Test Waiver for Coal- and Oil-Fired Electric Utility Steam Generating Unit

40 CFR part 63, subpart UUUUU

2025-05-19

Clean Harbors—Kimball NE

Alternative Monitoring for Hazardous Waste Combustors

40 CFR part 63, subpart EEE

2025-05-14

QSS Biosolids, LLC

Applicability Determination for Sewage Sludge Incineration Units

40 CFR part 60, subpart LLLL; 40 CFR part 60, subpart CCCC

2025-05-13

Citgo Corpus Christi East Refinery

Alternative Monitoring for Petroleum Refineries

40 CFR part 60, subpart Ja

2025-04-25

Heartland Corn Products

Request for Operating Limits/Monitoring Petitions for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2025-04-22

Potlatch Deltic Saint Marie's

Regulatory Interpretation for Industrial, Commercial, and Institutional Boilers and Process Heaters

40 CFR part 63, subpart DDDDD

2025-03-13

Domtar AW LLC—Ashdown AR

Applicability Determination for Kraft Pulp Mills

40 CFR part 60, subpart BB; 40 CFR part 63, subpart S

2025-03-10

Birmingham Airport Authority

Applicability Determination for Other Solid Waste Incineration Units

40 CFR part 60, subpart EEEE

2025-03-10

Duke Energy

Regulatory Interpretation for Stationary Reciprocating Internal Combustion Engines

40 CFR part 63, subpart ZZZZ

2025-02-27

Dow Chemical—Freeport, TX

Alternative Monitoring for Polymers and Resins

40 CFR part 63, subpart JJJ

2025-01-08

Arbor Management Specialist

Applicability Determination for Commercial and Industrial Solid Waste Incineration Units

40 CFR part 60, subpart CCCC

2024-12-10

Shuqualak Lumber Company

Alternative Monitoring for Industrial, Commercial, and Institutional Boilers and Process Heaters

40 CFR part 63, subpart DDDDD

2024-12-05

Chem Plate Industries

Applicability Determination for Sludge Drying Operation

40 CFR part 61, subpart E

2024-10-10

Primient Lafayette

Alternative Monitoring for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2024-09-26

Kaiser Aluminum Spokane Valley

Regulatory Interpretation for Secondary Aluminum Production

40 CFR part 63, subpart RRR

2024-09-09

Consumers Muskegon River Compressor Station

Alternative Operating Limits/Monitoring for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2024-09-05

Oil Energy Systems Inc

Applicability Determination for Other Solid Waste Incineration Units

40 CFR part 60, subpart EEEE

2024-09-05

Sonoma Ecology Center (SEC)

Applicability Determination for Other Solid Waste Incineration

40 CFR part 60, subpart EEEE

2024-08-22

Platte Generating Station

Alternative Recordkeeping/Reporting for Coal- and Oil-Fired Electric Utility Steam Generating Unit

40 CFR part 63, subpart UUUUU

2024-08-22

Cerro Colorado Landfill—City of Albuquerque

Alternative Monitoring for MSW Landfills

40 CFR part 60, subpart Cf

2024-08-07

Aurora Energy

Alternative Reporting for Oil and Gas Exploration and Production Operation

40 CFR part 63, subpart JJJJJJ

2024-08-01

Lon D Wright Power Plant

Alternative Reporting and Recordkeeping Requirements for Coal-Fired Power Plant

40 CFR part 63, subpart UUUUU

2024-08-01

Monarch Ceramic Tile

Applicability Determination for Nonmetallic Mineral Processing Plant

40 CFR part 60, subpart OOO

2024-07-02

North Wake Landfill

Alternative Landfill Gas Flowrate Calculation Procedures for NSWL

40 CFR part 62, subpart OOO; 40 CFR part 63, subpart AAAA

2024-07-02

Nebraska City Station and North Omaha Station

Alternative Recordkeeping and Reporting for MATS

40 CFR part 63, subpart UUUUU

2024-07-01

Savant Alaska

Alternative Reporting for Oil and Gas Exploration and Production Operation

40 CFR part 60, subpart OOOOa

2024-07-01

Enerfin Resources Northwest

Alternative Monitoring for Measurement of VHAP

40 CFR part 63, subpart HH

2024-06-17

CLECO Brame Energy Center—Madison Units 3-1_3-2

Performance Test Waiver for Coal- and Oil-Fired Electric Utility Steam Generating Units

40 CFR part 63, subpart UUUUU; 40 CFR part 63, subpart A

2024-06-13

ANR Pipeline Sulphur Springs CS

Alternative Operating Limits/Monitoring for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2024-06-04

Brown County South Landfill

Applicability Determination for Municipal Solid Waste

40 CFR part 60, subpart XXX

2024-05-13

DTE Gas Company—Belle River Mills, Milford, and Willow Run

Alternative Operating Limits/Monitoring for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2024-05-02

GVEA Healy

Alternative Test Dates for MATS

40 CFR part 63, subpart UUUUU

2024-04-25

BP Pipelines (North America) Inc

Applicability Determination for Petroleum Refinery

40 CFR part 60, subpart Ja

2024-04-15

Amgen Manufacturing, Limited

Performance Test Extension for Stationary Combustion Turbine

40 CFR part 60, subpart KKKK:

2024-04-11

Alyeska Valdez Marine Terminal

Applicability Determination for Municipal Waste Combustors

40 CFR part 63, subpart EEEE; 40 CFR part 63, subpart SS

2024-04-04

City of Spokane Waste to Energy Facility

Other: Force Majeure

40 CFR part 60, subpart Eb; 40 CFR part 60, subpart Cb

2024-04-03

Diversified Vapor Technologies

Alternative Monitoring Plan and Performance Waiver for Petroleum Refineries

40 CFR part 60, subpart J; 40 CFR part 60, subpart Ja

2024-03-27

MSU Simon Turbine

Applicability Determination for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2024-03-25

Dow Chemical Plaquemine Operations

Applicability Determination for MON

40 CFR part 63, subpart FFFF

2024-03-18

U.S. Steel—Keetac

Applicability Determination for Ore Processing

40 CFR part 63, subpart RRRRR

2024-02-26

Consumers Energy's Muskegon River Compressor Station

Applicability Determination for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2024-02-21

DTE Marietta

Applicability Determination for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2024-02-21

ANR Pipeline Company (ANR) LaGrange Compressor Station

Applicability Determination for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2024-02-20

Seepex, Inc

Applicability Determination for Nine Metal Fabrication and Finishing Source Categories

40 CFR part 63, subpart XXXXXX

2024-01-25

Cleveland—Cliffs Minorca Mine Inc

Alternative Monitoring Request for Taconite Iron Ore Processing Units

40 CFR part 63, subpart RRRRR; 40 CFR part 60, subpart BBa; 40 CFR part 63, subpart MM

2024-01-19

Applied Gaia B3 Continuous Pyrolysis Machine (Biochar Reactor)

Applicability Determination for the Other Solid Waste Incineration Units

40 CFR part 60, subpart EEEE

2024-01-09

Corteva Midland Michigan

Applicability Determination Regarding the Distillation of a SOCMI-listed Chemical

40 CFR part 63, subpart F; 40 CFR part 60, subpart VVa; 40 CFR part 63, subpart G

2023-12-12

DTE Gas Company, Milford Compressor Station

Alternative Monitoring for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2023-12-08

DTE Gas Company, Willow Compressor Station

Alternative Monitoring for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2023-12-08

DTE Gas Company, Belle River Compressor Station

Alternative Monitoring for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2023-12-08

Primary Products Ingredients Americas LLC—Primient South

Alternative Monitoring for Stationary Gas Turbines

40 CFR part 63, subpart YYYY

2023-12-08

MSU Simon Power Plant

Alternative Operating Limits/Monitoring for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2023-12-08

Consumers Energy Company—Muskegon River Compressor Station

Alternative Operating Limits/Monitoring for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2023-11-07

DTE Marietta

Alternative Operating Limits/Monitoring for Stationary Combustion Turbines

40 CFR part 63, subpart YYYY

2023-11-07

Cottonwood Hills RDF

Other Request for MSW Landfills

40 CFR part 63, subpart AAAA

2023-10-31

DTE Greenwood Energy Center

Applicability Determination for Electric Generating Unit

40 CFR part 63, subpart DDDDD; 40 CFR part 63, subpart UUUUU

2023-10-24

Baxter Healthcare of Puerto Rico

Performance Test Extension for Stationary Spark Ignition Internal Combustion Engines

40 CFR part 60, subpart JJJJ

2023-10-10

Holmes Regional Medical Center

Alternative Testing for Stationary Compression Combustion Engine

40 CFR part 63, subpart ZZZZ; 40 CFR part 60, subpart IIII

2023-10-05

Magellan Pipeline Company, L.P.—Osborn Station

Test Extension Request for Reciprocating Internal Combustion Engine

40 CFR part 63, subpart ZZZZ

2023-09-18

Panagiotis Tsirigotis,

Director, Office of Air Quality Planning and Standards.

[FR Doc. 2025-19988 Filed 11-14-25; 8:45 am]

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