DAQ-2025-001461

DAQE-AN142650007-25

{{$d1 }}

Denise Kohtala
Kern River Gas Transmission Company
2755 East Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121
[e-mail]

Dear Ms. Kohtala:

Re: Approval Order: Administrative Amendment to Approval Order DAQE-AN0142650001-10 for a
10-Year Review and Permit Updates
Project Number: N142650007

The attached Approval Order (AO) is issued pursuant to the Division of Air Quality conducting a 10-year
administrative review of this source and its respective AO. Kern River Gas Transmission Company must
comply with the requirements of this AO, all applicable state requirements (R307), and Federal
Standards.

The project engineer for this action is Katie Andersen, who can be contacted at [phone] or
[e-mail]. Future correspondence on this AO should include the engineer's name as well as
the DAQE number shown on the upper right-hand corner of this letter.

Sincerely,

{{$s }}

Bryce C. Bird
Director

BCB:KA:jg

cc: Southwest Utah Public Health Department
EPA Region 8

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144820 • Salt Lake City, UT 84114-4820
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor

Department of
Environmental Quality

Tim Davis
Interim Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

March 11, 2025

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

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APPROVAL ORDER
DAQE-AN142650007-25
Administrative Amendment to Approval Order
DAQE-AN0142650001-10 for a 10-Year Review
and Permit Updates

Prepared By
Katie Andersen, Engineer
[phone]
[e-mail]

Issued to
Kern River Gas Transmission Company - Milford Compressor Station

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality

March 11, 2025
TABLE OF CONTENTS

TITLE/SIGNATURE PAGE ....................................................................................................... 1
GENERAL INFORMATION ...................................................................................................... 3
CONTACT/LOCATION INFORMATION ............................................................................... 3
SOURCE INFORMATION ........................................................................................................ 3
General Description ................................................................................................................ 3
NSR Classification .................................................................................................................. 3
Source Classification .............................................................................................................. 3
Applicable Federal Standards ................................................................................................. 3
Project Description.................................................................................................................. 4
SUMMARY OF EMISSIONS .................................................................................................... 4
SECTION I: GENERAL PROVISIONS .................................................................................... 4
SECTION II: PERMITTED EQUIPMENT .............................................................................. 5
SECTION II: SPECIAL PROVISIONS ..................................................................................... 6
PERMIT HISTORY ..................................................................................................................... 8
ACRONYMS ................................................................................................................................. 9

DAQE-AN142650007-25
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Kern River Gas Transmission Company Kern River Gas Transmission Company - Milford Compressor Station

Mailing Address Physical Address
2755 East Cottonwood Parkway, Suite 300 -112.994155883789 38.2594604492188
Salt Lake City, UT 84121 Minersville, UT 84012

Source Contact UTM Coordinates
Name: Denise Kohtala 325,531 m Easting
Phone: [phone],236,477 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12
SIC code 4922 (Natural Gas Transmission)

SOURCE INFORMATION
General Description
Kern River Gas Transmission Company (Kern River) owns and operates the Milford Compressor Station
located in a remote area of Beaver County. The Milford Compressor Station consists of the following
equipment: a natural gas turbine compressor, a natural gas emergency generator, and a natural gas heater.
The Milford Compressor Station is designed to pressurize natural gas in a natural gas transmission
pipeline that runs from Wyoming to California.

NSR Classification
10-Year Review

Source Classification
Located in Attainment Area
Beaver County
Airs Source Size: B

Applicable Federal Standards
NSPS (Part 60), A: General Provisions
NSPS (Part 60), JJJJ: Standards of Performance for Stationary Spark Ignition Internal
Combustion Engines
NSPS (Part 60), KKKK: Standards of Performance for Stationary Combustion Turbines
MACT (Part 63), A: General Provisions
DAQE-AN142650007-25
Page 4

MACT (Part 63), ZZZZ: National Emissions Standards for Hazardous Air Pollutants for
Stationary Reciprocating Internal Combustion Engines
Title V (Part 70) Area Source

Project Description
This is a 10-Year Review to update the language, format, and layout of the AO to match current DAQ
permitting standards. While processing the 10-Year Review, Kern River submitted a notice of intent to
exchange the gas producer and power turbine modular component of Unit 1, or T-1 (Equipment ID
II.A.2). After review, the DAQ determined that the exchange qualifies as a Replacement-in-Kind (RIK)
under UAC R307-401-11 Replacement-in-Kind Equipment. This 10-Year Review should be considered
as DAQ's acceptance of the RIK.

SUMMARY OF EMISSIONS

The emissions listed below are an estimate of the total potential emissions from the source. Some
rounding of emissions is possible.

Criteria Pollutant Change (TPY) Total (TPY)
Carbon Monoxide 0 48.00
Nitrogen Oxides 0 47.00
Particulate Matter - PM10 0 5.50
Particulate Matter - PM2.5 0 5.50
Sulfur Dioxide 0 2.7
Volatile Organic Compounds 0 5.60

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Generic HAPs (CAS #GHAPS) 0 2000
Change (TPY) Total (TPY)
Total HAPs 0 1.00

SECTION I: GENERAL PROVISIONS

I.1 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns. [R307-107] I.2 All definitions, terms, abbreviations, and references used in this AO conform to those used in the UAC R307 and 40 CFR. Unless noted otherwise, references cited in these AO conditions refer to those rules. [R307-101]
I.3 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401] I.4 Modifications to the equipment or processes approved by this AO that could affect the emissions covered by this AO must be reviewed and approved. [R307-401-1]
DAQE-AN142650007-25
Page 5

I.5 All records referenced in this AO or in other applicable rules, which are required to be kept by the owner/operator, shall be made available to the Director or Director's representative upon request, and the records shall include the two-year period prior to the date of the request. Unless otherwise specified in this AO or in other applicable state and federal rules, records shall be kept for a minimum of two (2) years. [R307-401-8] I.6 At all times, including periods of startup, shutdown, and malfunction, owners and operators shall, to the extent practicable, maintain and operate any equipment approved under this AO,
including associated air pollution control equipment, in a manner consistent with good air pollution control practice for minimizing emissions. Determination of whether acceptable operating and maintenance procedures are being used will be based on information available to
the Director which may include, but is not limited to, monitoring results, opacity observations, review of operating and maintenance procedures, and inspection of the source. All maintenance performed on equipment authorized by this AO shall be recorded. [R307-401-4]

I.7 The owner/operator shall comply with UAC R307-150 Series. Emission Inventories. [R307-150]
I.8 The owner/operator shall submit documentation of the status of construction or modification to the Director within 18 months from the date of this AO. This AO may become invalid if
construction is not commenced within 18 months from the date of this AO or if construction is
discontinued for 18 months or more. To ensure proper credit when notifying the Director, send the documentation to the Director, attn.: NSR Section. [R307-401-18]

SECTION II: PERMITTED EQUIPMENT
II.A THE APPROVED EQUIPMENT
II.A.1 Facility Wide Turbine Compressor Station II.A.2 T-1 Natural Gas Compressor Turbine Manufacturer: Solar Turbine Model Number: Titan 250-30000S Maximum rated output capacity: 26,548 horsepower Control: SoLoNOx combustion technology (CO and NOx emissions)
II.A.3 H-1 Heater Fuel Type: Natural gas Capacity: 8.0 MMBtu/hr (nameplate) II.A.4 SGE Standby Generator Engine Fuel Type: Natural gas Capacity: 2311 horsepower or less

DAQE-AN142650007-25
Page 6

SECTION II: SPECIAL PROVISIONS
II.B REQUIREMENTS AND LIMITATIONS

II.B.1 Site Wide Requirements
II.B.1.a The owner/operator shall not allow visible emissions from any stationary point or fugitive
emission source associated with the source or with the control facilities to exceed 10% opacity.
[R307-401-8]

II.B.1.a.1 Opacity observations of emissions from stationary sources shall be conducted in accordance with 40 CFR 60, Appendix A, Method 9. [R307-401-8]
II.B.1.b The owner/operator shall not operate the emergency generator on site for more than 100 hours
per rolling 12-month period during non-emergency situations. There is no time limit on the use
of the emergency generator during emergencies. [40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.1.b.1 To determine compliance with a rolling 12-month total, the owner/operator shall calculate a new 12-month total by the 20th day of each month using data from the previous 12 months. Records documenting the operation of each emergency generator shall be kept in a log and shall include the following: A. The date the emergency generator was used B. The duration of operation in hours C. The reason for the emergency generator usage. [40 CFR 63 Subpart ZZZZ, R307-401-8]
II.B.2 Stack Testing Requirements
II.B.2.a The owner/operator shall conduct any stack testing required by this AO according to the following conditions. [R307-401-8]
II.B.2.b The owner/operator shall not emit more than the following rates and concentrations from the
Turbine Compressor Engine:

Pollutant lb/hr ppmdv
NOx 10.70 15.00
CO 10.86 25.00
VOC 1.24 25.00

Concentration (ppmdv) is corrected to 15% oxygen, dry basis. The emission rates (lb/hr) are
based on turbine operation at 0oF. [R307-401-8]

II.B.2.b.1 Initial Test The owner/operator shall conduct an initial stack test on the emission unit within 180 days after startup of the emission unit. [R307-165-2]
II.B.2.b.2 Test Frequency
The owner/operator shall conduct a stack test on the emission unit per 40 CFR 60.4340 (a) or (b), subsequent to the initial compliance test. The Director may require the owner/operator to perform
a stack test at any time. [R307-165-2, R307-401-8]

DAQE-AN142650007-25
Page 7

II.B.2.b.3 Notification At least 30 days prior to conducting a stack test, the owner/operator shall submit a source test protocol to the Director. The source test protocol shall include the items contained in R307-165-3. If directed by the Director, the owner/operator shall attend a pretest conference. [R307-165-3, R307-401-8] II.B.2.b.4 Testing & Test Conditions The owner/operator shall conduct testing according to the approved source test protocol and
according to the test conditions contained in R307-165-4. [R307-165-4, R307-401-8]
II.B.2.b.5 Access The owner/operator shall provide Occupational Safety and Health Administration (OSHA)- or Mine Safety and Health Administration (MSHA)-approved access to the test location. [R307-401-8]
II.B.2.b.6 Reporting No later than 60 days after completing a stack test, the owner/operator shall submit a written
report of the results from the stack testing to the Director. The report shall include validated
results and supporting information. [R307-165-5, R307-401-8]
II.B.2.b.7 Possible Rejection of Test Results The Director may reject stack testing results if the test did not follow the approved source test protocol or for a reason specified in R307-165-6. [R307-165-6, R307-401-8]
II.B.2.b.8 Test Methods
When performing stack testing, the owner/operator shall use the appropriate EPA-approved test methods as acceptable to the Director. Acceptable test methods for pollutants are listed below.
[R307-401-8]

II.B.2.c Standard Conditions A. Temperature - 68 degrees Fahrenheit (293 K) B. Pressure - 29.92 in Hg (101.3 kPa) C. Averaging Time - As specified in the applicable test method. [40 CFR 60 Subpart A, 40 CFR 63 Subpart A, R307-401-8] II.B.2.c.1 NOx
40 CFR 60, Appendix A, Method 7; Method 7E; or other EPA-approved testing method as
acceptable to the Director. [R307-401-8]
II.B.2.c.2 VOC 40 CFR 60, Appendix A, Method 18; Method 25; Method 25A; 40 CFR 63, Appendix A, Method 320; or other EPA-approved testing method as acceptable to the Director. [R307-401-8]
II.B.2.c.3 CO
40 CFR 60, Appendix A, Method 10, or other EPA-approved testing method as acceptable to the
Director. [R307-401-8]

DAQE-AN142650007-25
Page 8

PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents: Supersedes AO DAQE-AN0142650001-10 dated March 29, 2010 Incorporates Replacement in Kind Notification dated February 3, 2025

DAQE-AN142650007-25
Page 9

ACRONYMS

The following lists commonly used acronyms and associated translations as they apply to this document:

40 CFR Title 40 of the Code of Federal Regulations
AO Approval Order
BACT Best Available Control Technology
CAA Clean Air Act
CAAA Clean Air Act Amendments
CDS Classification Data System (used by Environmental Protection Agency to classify
sources by size/type)
CEM Continuous emissions monitor
CEMS Continuous emissions monitoring system
CFR Code of Federal Regulations
CMS Continuous monitoring system
CO Carbon monoxide
CO2 Carbon Dioxide
CO2e Carbon Dioxide Equivalent - Title 40 of the Code of Federal Regulations Part 98,
Subpart A, Table A-1
COM Continuous opacity monitor
DAQ/UDAQ Division of Air Quality
DAQE This is a document tracking code for internal Division of Air Quality use
EPA Environmental Protection Agency
FDCP Fugitive dust control plan
GHG Greenhouse Gas(es) - Title 40 of the Code of Federal Regulations 52.21 (b)(49)(i)
GWP Global Warming Potential - Title 40 of the Code of Federal Regulations Part 86.1818-
12(a)
HAP or HAPs Hazardous air pollutant(s)
ITA Intent to Approve
LB/YR Pounds per year MACT Maximum Achievable Control Technology MMBTU Million British Thermal Units NAA Nonattainment Area NAAQS National Ambient Air Quality Standards NESHAP National Emission Standards for Hazardous Air Pollutants NOI Notice of Intent
NOx Oxides of nitrogen
NSPS New Source Performance Standard
NSR New Source Review
PM10 Particulate matter less than 10 microns in size
PM2.5 Particulate matter less than 2.5 microns in size
PSD Prevention of Significant Deterioration
PTE Potential to Emit
R307 Rules Series 307
R307-401 Rules Series 307 - Section 401
SO2 Sulfur dioxide
Title IV Title IV of the Clean Air Act
Title V Title V of the Clean Air Act
TPY Tons per year
UAC Utah Administrative Code
VOC Volatile organic compounds

DAQE-
RN142650007 February 13, 2025 Denise Kohtala Kern River Gas Transmission Company 2755 E Cottonwood Parkway, Suite 300 Salt Lake City, UT 84121 [e-mail] Dear Denise Kohtala, Re: Engineer Review: Administrative Amendment to Update AO DAQE-AN0142650001-10 for a 10-Year Review and Permit Updates Project Number: N142650007 The DAQ requests a company representative review and sign the attached Engineer Review (ER). This ER identifies all applicable elements of the New Source Review (NSR) permitting program. Kern River Gas Transmission Company should complete this review within 10 business days of receipt. Kern River Gas Transmission Company should contact Katie Andersen at [phone] if there are questions or concerns with the review of the draft permit conditions. Upon resolution of your concerns, please email Katie Andersen at [e-mail] the signed cover letter. Upon receipt of the signed cover letter, the DAQ will prepare an Approval Order (AO) for signature by the DAQ Director. If Kern River Gas Transmission Company does not respond to this letter within 10 business days, the project will move forward without source concurrence. If Kern River Gas Transmission Company has concerns that cannot be resolved and the project becomes stagnant, the DAQ Director may issue an Order prohibiting construction. Approval Signature _____________________________________________________________ (Signature & Date)
195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144820 • Salt Lake City, UT 84114-4820
Telephone [phone] • Fax [phone] • T.D.D. [phone] www.deq.utah.gov Printed on 100% recycled paper
Department of Environmental Quality
Kimberly D. Shelley Executive Director DIVISION OF AIR QUALITY Bryce C. Bird Director
State of Utah
SPENCER J. COX Governor DEIDRE HENDERSON Lieutenant Governor

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 1
UTAH DIVISION OF AIR QUALITY ENGINEER REVIEW
SOURCE INFORMATION Project Number N142650007 Owner Name Kern River Gas Transmission Company Mailing Address 2755 E Cottonwood Parkway, Suite 300 Salt Lake City, UT, 84121 Source Name Kern River Gas Transmission Company- Milford Compressor Station Source Location 5 Miles Northwest of Minersville on Highway 129 Minersville, UT 84012 UTM Projection 325,531 m Easting, 4,236,477 m Northing UTM Datum NAD83 UTM Zone UTM Zone 12 SIC Code 4922 (Natural Gas Transmission) Source Contact Denise Kohtala Phone Number [phone] Email [e-mail] Billing Contact Denise Kohtala Phone Number [phone] Email [e-mail] Project Engineer Katie Andersen, Engineer Phone Number [phone] Email [e-mail] Notice of Intent (NOI) Submitted February 3, 2025 Date of Accepted Application February 6, 2025

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 2
SOURCE DESCRIPTION General Description Kern River Gas Transmission Company (Kern River) owns and operates the Milford Compressor Station located in a remote area of Beaver County. The Milford Compressor Station consists of the following equipment; a natural gas turbine compressor, a natural gas emergency generator and a natural gas heater. The Milford Compressor Station is designed to pressurize natural gas in a natural gas transmission pipeline that runs from Wyoming to California. NSR Classification: Administrative Amendment Source Classification Located in Attainment Area Beaver County Airs Source Size: B Applicable Federal Standards NSPS (Part 60), A: General Provisions NSPS (Part 60), JJJJ: Standards of Performance for Stationary Spark Ignition Internal Combustion Engines NSPS (Part 60), KKKK: Standards of Performance for Stationary Combustion Turbines MACT (Part 63), A: General Provisions MACT (Part 63), ZZZZ: National Emissions Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines Title V (Part 70) Area Source Project Proposal Administrative Amendment to Update AO DAQE-AN0142650001-10 for a 10-Year Review and Permit Updates Project Description This is a 10-Year Review to update the language, format, and layout of the Approval Order to match current DAQ permitting standards. While processing the 10-Year Review, Kern River submitted a notice of intent to exchange the gas producer and power turbine modular component of Unit 1, or T-1 (Equipment ID II.A.2). After review, the DAQ determined that the exchange qualifies as a Replacement-in-Kind (RIK) under UAC R307-401-11 Replacement-in-Kind Equipment. This 10-Year Review should be considered as DAQ's acceptance of the RIK. EMISSION IMPACT ANALYSIS This is a 10-Year Review to update the language, format, and layout of the Approval Order to match current DAQ permitting standards. There are no changes to equipment nor emissions as a result of this update. Therefore, modeling is not required at this time. [Last updated February 6, 2025]

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 3
SUMMARY OF EMISSIONS The emissions listed below are an estimate of the total potential emissions from the source. Some rounding of emissions is possible. Criteria Pollutant Change (TPY) Total (TPY)
Carbon Monoxide 0 48.00
Nitrogen Oxides 0 47.00 Particulate Matter - PM10 0 5.50 Particulate Matter - PM2.5 0 5.50 Sulfur Dioxide 0 2.7
Volatile Organic Compounds 0 5.60 Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr) Generic HAPs (CAS #GHAPS) 0 2000 Change (TPY) Total (TPY)
Total HAPs 0 1.00 Note: Change in emissions indicates the difference between previous AO and proposed modification.
Commented [KA1]: Manually Enter zeros

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 4
Review of BACT for New/Modified Emission Units 1. BACT review regarding 10-Year Review This is a 10-Year Review to update the language, format, and layout of the Approval Order to match current DAQ permitting standards. There are no changes to equipment nor emissions as a result of this update. Therefore, a BACT analysis is not required at this time. [Last updated February 6, 2025]

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 5
SECTION I: GENERAL PROVISIONS The intent is to issue an air quality AO authorizing the project with the following recommended conditions and that failure to comply with any of the conditions may constitute a violation of the AO. (New or Modified conditions are indicated as “New” in the Outline Label): I.1 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns. [R307-107] I.2 All definitions, terms, abbreviations, and references used in this AO conform to those used in the UAC R307 and 40 CFR. Unless noted otherwise, references cited in these AO conditions refer to those rules. [R307-101]
I.3 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401]
I.4 Modifications to the equipment or processes approved by this AO that could affect the emissions covered by this AO must be reviewed and approved. [R307-401-1] I.5 All records referenced in this AO or in other applicable rules, which are required to be kept by the owner/operator, shall be made available to the Director or Director's representative upon request, and the records shall include the two-year period prior to the date of the request. Unless otherwise specified in this AO or in other applicable state and federal rules, records shall be kept for a minimum of two (2) years. [R307-401-8]
I.6 At all times, including periods of startup, shutdown, and malfunction, owners and operators shall, to the extent practicable, maintain and operate any equipment approved under this AO, including associated air pollution control equipment, in a manner consistent with good air pollution control practice for minimizing emissions. Determination of whether acceptable operating and maintenance procedures are being used will be based on information available to the Director which may include, but is not limited to, monitoring results, opacity observations, review of operating and maintenance procedures, and inspection of the source. All maintenance performed on equipment authorized by this AO shall be recorded. [R307-401-4] I.7 The owner/operator shall comply with UAC R307-150 Series. Emission Inventories. [R307-150] I.8 The owner/operator shall submit documentation of the status of construction or modification to the Director within 18 months from the date of this AO. This AO may become invalid if construction is not commenced within 18 months from the date of this AO or if construction is discontinued for 18 months or more. To ensure proper credit when notifying the Director, send the documentation to the Director, attn.: NSR Section. [R307-401-18]

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 6
SECTION II: PERMITTED EQUIPMENT The intent is to issue an air quality AO authorizing the project with the following recommended conditions and that failure to comply with any of the conditions may constitute a violation of the AO. (New or Modified conditions are indicated as “New” in the Outline Label): II.A THE APPROVED EQUIPMENT II.A.1 Facility Wide Turbine Compressor Station
II.A.2 T-1 Natural Gas Compressor Turbine Manufacturer: Solar Turbine Model Number: Titan 250-30000S Maximum rated output capacity: 26,548 horsepower Control: SoLoNOx combustion technology (CO and NOx emissions) II.A.3 H-1 Heater Fuel Type: Natural gas Capacity: 8.0 MMBtu/hr (name plate) II.A.4 SGE Standby Generator Engine Fuel Type: Natural gas Capacity: 2311 horsepower or less
SECTION II: SPECIAL PROVISIONS
The intent is to issue an air quality AO authorizing the project with the following recommended conditions and that failure to comply with any of the conditions may constitute a violation of the AO. (New or Modified conditions are indicated as “New” in the Outline Label): II.B REQUIREMENTS AND LIMITATIONS II.B.1 Site Wide Requirements II.B.1.a NEW The owner/operator shall not allow visible emissions from any stationary point or fugitive emission source associated with the source or with the control facilities to exceed 10% opacity. [R307-401-8] II.B.1.a.1 NEW Opacity observations of emissions from stationary sources shall be conducted in accordance with 40 CFR 60, Appendix A, Method 9. [R307-401-8]
II.B.1.b NEW The owner/operator shall not operate emergency generator on site for more than 100 hours per rolling 12-month period during non-emergency situations. There is no time limit on the use of the emergency generator during emergencies. [40 CFR 63 Subpart ZZZZ, R307-401-8]

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 7
II.B.1.b.1 NEW To determine compliance with a rolling 12-month total, the owner/operator shall calculate a new 12-month total by the 20th day of each month using data from the previous 12 months. Records documenting the operation of each emergency generator shall be kept in a log and shall include the following: A. The date the emergency generator was used B. The duration of operation in hours C. The reason for the emergency generator usage. [40 CFR 63 Subpart ZZZZ, R307-401-8] II.B.2 NEW Stack Testing Requirements
II.B.2.a NEW The owner/operator shall conduct any stack testing required by this AO according to the following conditions. [R307-401-8] II.B.2.b NEW The owner/operator shall not emit more than the following rates and concentrations from the Turbine Compressor Engine: Pollutant lb/hr ppmdv NOx 10.70 15.00 CO 10.86 25.00 VOC 1.24 25.00 Concentration (ppmdv) is corrected to 15% oxygen, dry basis. The emission rates (lb/hr) are based on turbine operation at 0oF. [R307-401-8]
II.B.2.b.1 NEW Initial Test The owner/operator shall conduct an initial stack test on the emission unit within 180 days after startup of the emission unit. [R307-165-2] II.B.2.b.2 NEW Test Frequency The owner/operator shall conduct a stack test on the emission unit per 40 CFR 60.4340 (a) or (b), subsequent to the initial compliance test. The Director may require the owner/operator to perform a stack test at any time. [R307-165-2, R307-401-8]
II.B.2.b.3 NEW Notification At least 30 days prior to conducting a stack test, the owner/operator shall submit a source test protocol to the Director. The source test protocol shall include the items contained in R307-165-3. If directed by the Director, the owner/operator shall attend a pretest conference. [R307-165-3, R307-401-8] II.B.2.b.4 NEW Testing & Test Conditions The owner/operator shall conduct testing according to the approved source test protocol and according to the test conditions contained in R307-165-4. [R307-165-4, R307-401-8]

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 8
II.B.2.b.5 NEW Access The owner/operator shall provide Occupational Safety and Health Administration (OSHA)- or Mine Safety and Health Administration (MSHA)-approved access to the test location. [R307-401-8] II.B.2.b.6 NEW Reporting No later than 60 days after completing a stack test, the owner/operator shall submit a written report of the results from the stack testing to the Director. The report shall include validated results and supporting information. [R307-165-5, R307-401-8] II.B.2.b.7 NEW Possible Rejection of Test Results The Director may reject stack testing results if the test did not follow the approved source test protocol or for a reason specified in R307-165-6. [R307-165-6, R307-401-8] II.B.2.b.8 NEW Test Methods When performing stack testing, the owner/operator shall use the appropriate EPA-approved test methods as acceptable to the Director. Acceptable test methods for pollutants are listed below. [R307-401-8]
II.B.2.c NEW Standard Conditions A. Temperature - 68 degrees Fahrenheit (293 K) B. Pressure - 29.92 in Hg (101.3 kPa) C. Averaging Time - As specified in the applicable test method [40 CFR 60 Subpart A, 40 CFR 63 Subpart A, R307-401-8]
II.B.2.c.1 NEW NOx 40 CFR 60, Appendix A, Method 7; Method 7E; or other EPA-approved testing method as acceptable to the Director. [R307-401-8] II.B.2.c.2 NEW VOC 40 CFR 60, Appendix A, Method 18; Method 25; Method 25A; 40 CFR 63, Appendix A, Method 320; or other EPA-approved testing method as acceptable to the Director. [R307-401-8] II.B.2.c.3 NEW CO 40 CFR 60, Appendix A, Method 10 or other EPA-approved testing method as acceptable to the Director. [R307-401-8]

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 9
PERMIT HISTORY When issued, the approval order shall supersede (if a modification) or will be based on the following documents: Supersedes AO DAQE-AN0142650001-10 dated March 29, 2010 Incorporates Replacement in Kind Notification dated February 3, 2025
REVIEWER COMMENTS 1. Comment regarding 10-Year Review: This is a 10-Year Review to update the language, format, and layout of the Approval Order to match current DAQ permitting standards. There are no changes to the equipment nor emissions as a result of the update. The following changes have been made to the conditions of DAQE-AN0142650001-10 dated March 29, 2010: source contact information has been updated, Condition II.B.1.a has been separated into two conditions, Condition II.B.1.b has been separated into multiple conditions, requirements of 40 CFR 63 (MACT) Subpart ZZZZ have been included to support the emergency generator conditions, Condition II.B.1.c has been removed since there is no new equipment being added at this time, and the language of the stack testing requirements has been updated. The next time the source goes through a modification, the emissions should be updated. [Last updated February 6, 2025] 2. Comment regarding Replacement in Kind: While processing this 10-Year Review, Kern River submitted a notice of intent dated February 3, 2025 to exchange the gas producer and power turbine modular component of Unit 1, or T-1 (Equipment ID II.A.2). The exchange of these components is a part of Kern River's routine maintenance program. The exchange turbine is identical or functionally equivalent to the turbine being replaced and will thus have the same horsepower, heat rate, and emissions. There are no other physical or operational changes in the equipment. There are no changes to emissions, the number of emission points, no new types of air pollutants, and the basic design of the process is not changing. Therefore, this replacement qualifies as a Replacement-in-Kind under UAC R307-401-11 Replacement-in-Kind Equipment. Kern River shall notify the director in writing when the installation of the exchanged unit has been completed and is operational. An initial compliance test is required within 180 days of installation. A notification shall be submitted at least 30 days prior to conducting any testing. To ensure proper credit when notifying the director, send your correspondence to the Director, attn: NSR Section. [Last updated February 13, 2025] 3. Comment regarding Federal Rule Applicability: 40 CFR 60 Subpart JJJJ Standards of Performance for Stationary Spark Ignition Internal Combustion Engines Subpart JJJJ applies to owners and operators of stationary SI ICE that commence construction after June 12, 2006. The standby generator engine was installed after June 12, 2006. Therefore, the source is subject to this subpart. 40 CFR 60 Subpart KKKK Standards of Performance for Stationary Combustion Turbines

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 10
Subpart KKKK applies to stationary combustion turbines with a heat input at peak load equal to or greater than 10.7 gigajoules (10 MMBtu) per hour which commenced construction after February 18, 2005. The stationary combustion turbine on site is rated at 26,548 hp, or about 67 MMBtu/hr. Therefore, Subpart KKKK applies to the turbine on site. 40 CFR 63 Subpart ZZZZ National Emissions Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines Subpart ZZZZ applies to owners and operators of stationary RICE at major or area sources of HAP emissions. The source is an area source of HAP emissions with a standby generator engine. Therefore, the source is subject to this subpart. [Last updated February 6, 2025] 4. Comment regarding Title V Applicability: Title V of the 1990 Clean Air Act (Title V) applies to the following: 1. Any major source 2. Any source subject to a standard, limitation, or other requirement under Section 111 of the Act, Standards of Performance for New Stationary Sources 3. Any source subject to a standard or other requirement under Section 112 of the Act, Hazardous Air Pollutants 4. Any Title IV affected source. This source is not a major source nor a Title IV affected source. The source is subject to 40 CFR 60 (NSPS) Subpart JJJJ and Subpart KKKK, and 40 CFR 63 (MACT) Subpart ZZZZ. NSPS Subpart JJJJ and MACT Subpart ZZZZ exempt a source from the obligation to obtain a Title V permit if there is no other reason for the source to obtain one. NSPS Subpart KKKK does not exempt the source from the obligation. Therefore, Title V applies to the source as an area source. [Last updated February 6, 2025]

Engineer Review N142650007: Kern River Gas Transmission Company- Milford Compressor Station February 13, 2025 Page 11
ACRONYMS The following lists commonly used acronyms and associated translations as they apply to this document: 40 CFR Title 40 of the Code of Federal Regulations AO Approval Order BACT Best Available Control Technology CAA Clean Air Act CAAA Clean Air Act Amendments CDS Classification Data System (used by EPA to classify sources by size/type) CEM Continuous emissions monitor CEMS Continuous emissions monitoring system CFR Code of Federal Regulations CMS Continuous monitoring system CO Carbon monoxide CO2 Carbon Dioxide CO2e Carbon Dioxide Equivalent - 40 CFR Part 98, Subpart A, Table A-1 COM Continuous opacity monitor DAQ/UDAQ Division of Air Quality DAQE This is a document tracking code for internal UDAQ use EPA Environmental Protection Agency FDCP Fugitive dust control plan GHG Greenhouse Gas(es) - 40 CFR 52.21 (b)(49)(i) GWP Global Warming Potential - 40 CFR Part 86.1818-12(a) HAP or HAPs Hazardous air pollutant(s) ITA Intent to Approve LB/HR Pounds per hour LB/YR Pounds per year MACT Maximum Achievable Control Technology MMBTU Million British Thermal Units NAA Nonattainment Area NAAQS National Ambient Air Quality Standards NESHAP National Emission Standards for Hazardous Air Pollutants NOI Notice of Intent NOx Oxides of nitrogen NSPS New Source Performance Standard NSR New Source Review PM10 Particulate matter less than 10 microns in size PM2.5 Particulate matter less than 2.5 microns in size PSD Prevention of Significant Deterioration PTE Potential to Emit R307 Rules Series 307 R307-401 Rules Series 307 - Section 401 SO2 Sulfur dioxide Title IV Title IV of the Clean Air Act Title V Title V of the Clean Air Act TPY Tons per year UAC Utah Administrative Code VOC Volatile organic compounds
Katie Andersen <[e-mail]>
Update to Kern River Gas Transmission Company Milford Compressor Station
Approval Order
7 messages
Katie Andersen <[e-mail]>Fri, Nov 15, 2024 at 11:12 AM
To: [e-mail]
Hello Denise Kohtala,
I'm reaching out in regards to the Division of Air Quality (DAQ) Approval Order (AO) DAQE-AN0142650001-10 dated
March 23, 2010 for the Kern River Gas Transmission Company Milford Compressor Station. According to the DAQ
records, the last change to the AO was made in 2010. Because there has not been a change in more than 10 year, the
DAQ has decided to initiate a 10-Year Review.
The purpose of a 10-Year Review is to update the format, language, and conditions of the AO to match the current DAQ
permitting standards. Typically, the conditions of the permit do not change, except for where the language is updated and
applicable federal rules are applied.
In the most recent compliance inspection report, you are listed as the source contact. Would you be the best person to
direct my questions to, or is there someone else I should contact about updating the Approval Order?
I appreciate your assistance!
Cheers,
Katie Andersen
-

Katie Andersen
Engineering Technician I | Minor NSR Section
M: [phone]
airquality.utah.gov
Kohtala, Denise (Kern River) <[e-mail]>Mon, Nov 18, 2024 at 8:26 AM
To: Katie Andersen <[e-mail]>
Cc: "Kitchen, Reed (Kern River)" <[e-mail]>
Kae,

Please direct your quesons to myself and Reed (cc’d).

Thanks
1/14/25, 12:58 PM State of Utah Mail - Update to Kern River Gas Transmission Company Milford Compressor Station Approval Order
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-8237873725216578545&simpl=msg-a:r68261955281872…1/7
You don't often get email from [e-mail]. Learn why this is important

Denise Kohtala
Manager, Land & Environmental
Pronouns: she | her | hers
[e-mail]
Phone: [phone]
Cell: 801-518-3342

From: Kae Andersen <[e-mail]>
Sent: Friday, November 15, 2024 11:12 AM
To: Kohtala, Denise (Kern River) <[e-mail]>
Subject: [INTERNET] Update to Kern River Gas Transmission Company Milford Compressor Staon Approval Order

THIS MESSAGE IS FROM AN EXTERNAL SENDER.
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Hello Denise Kohtala,

I'm reaching out in regards to the Division of Air Quality (DAQ) Approval Order (AO) DAQE-AN0142650001-10 dated
March 23, 2010 for the Kern River Gas Transmission Company Milford Compressor Station. According to the DAQ
records, the last change to the AO was made in 2010. Because there has not been a change in more than 10 year, the
DAQ has decided to initiate a 10-Year Review.

The purpose of a 10-Year Review is to update the format, language, and conditions of the AO to match the current DAQ
permitting standards. Typically, the conditions of the permit do not change, except for where the language is updated and
applicable federal rules are applied.

In the most recent compliance inspection report, you are listed as the source contact. Would you be the best person to
direct my questions to, or is there someone else I should contact about updating the Approval Order?

I appreciate your assistance!
Cheers,
Katie Andersen
-
1/14/25, 12:58 PM State of Utah Mail - Update to Kern River Gas Transmission Company Milford Compressor Station Approval Order
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-8237873725216578545&simpl=msg-a:r68261955281872…2/7

Katie Andersen
Engineering Technician I | Minor NSR Section
M: [phone]
airquality.utah.gov

This email, including aachments, may contain highly sensive, confidenal, proprietary or valuable informaon. It is
intended only for the designated recipient(s) named above. Any unauthorized use, reproducon, forwarding or distribuon of
this transmission, including aachments, is prohibited. If you have received this communicaon in error, please immediately
nofy the sender and permanently delete any record of this transmission.
Katie Andersen <[e-mail]>Mon, Nov 25, 2024 at 10:14 AM
To: "Kohtala, Denise (Kern River)" <[e-mail]>
Cc: "Kitchen, Reed (Kern River)" <[e-mail]>
Denise,
Thank you for getting back to me. Here are my questions:
1. Our records indicate that the source contact is Mr. Lee Bauerle with a phone number of [phone]. Is this
correct?
1a. If the above contact is not correct, please provide the name, phone number, email, and mailing address of the correct
source contact.
2. Please confirm the name and mailing address of the Permittee: Kern River Gas Transmission Company located at
2755 E Cottonwood parkway, Suite 300 PO Box 71400 Salt Lake City Utah 84171
3. Please confirm the permitted location: Kern River Gas Transmission Company Milford Compressor Station located at
800 East 7900 South Minersville, Utah 84012
4. Please provide the name, phone number, email, and mailing address for the billing contact.
5. The current AO lists the following equipment, please confirm that each item is still on site. If there are additional
equipment items, please include them.
T-1 Natural Gas Compressor Turbine.
Maximum rated output capacity: 26,548 horsepower
Controls: SoLoNOx Combustion technology
H-1 Heater
1/14/25, 12:58 PM State of Utah Mail - Update to Kern River Gas Transmission Company Milford Compressor Station Approval Order
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-8237873725216578545&simpl=msg-a:r68261955281872…3/7
Fuel Type: Natural gas
Capacity: 8.0 MMBtu/hr
SGE Standby Generator Engine
Fuel Type: Natural Gas
Capacity: 2311 horsepower or less.
I believe this is enough information to get started on updating the existing AO. If I need additional information, I will reach
out again.
I appreciate your assistance.
Cheers,
Katie Andersen
[Quoted text hidden]
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[Quoted text hidden]
Katie Andersen <[e-mail]>Thu, Jan 2, 2025 at 2:57 PM
To: "Kohtala, Denise (Kern River)" <[e-mail]>
Cc: "Kitchen, Reed (Kern River)" <[e-mail]>
Hi Denise,
I imagine life and work gets pretty busy with the holidays! Now that we are past most of the festivities, I wanted to follow
up with you to see if you can provide the information I've requested.
Cheers,
Katie Andersen
[Quoted text hidden]
Kohtala, Denise (Kern River) <[e-mail]>Mon, Jan 6, 2025 at 8:23 AM
To: Katie Andersen <[e-mail]>
Cc: "Kitchen, Reed (Kern River)" <[e-mail]>
Kae,

I apologize! I set this aside to work on and never got back to it. I will have responses for you by the end of the week.

Denise
[Quoted text hidden]
[Quoted text hidden]
[Quoted text hidden]
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[Quoted text hidden]
1/14/25, 12:58 PM State of Utah Mail - Update to Kern River Gas Transmission Company Milford Compressor Station Approval Order
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-8237873725216578545&simpl=msg-a:r68261955281872…4/7
Katie Andersen <[e-mail]>Mon, Jan 6, 2025 at 9:01 AM
To: "Kohtala, Denise (Kern River)" <[e-mail]>
Cc: "Kitchen, Reed (Kern River)" <[e-mail]>
Denise,
Thank you!
I will look for your response and will follow up next week if I don't hear back from you.
Cheers,
Katie Andersen
[Quoted text hidden]
--

Katie Andersen
Engineer I | Minor NSR Section
M: [phone]
airquality.utah.gov
Kitchen, Reed (Kern River) <[e-mail]>Mon, Jan 6, 2025 at 11:26 AM
To: Katie Andersen <[e-mail]>
Cc: "Kohtala, Denise (Kern River)" <[e-mail]>
Good morning Katie,

I apologize for the delay in this response. Listed below is the information requested for the update of the Milford
Compressor Station Approval Order. Please let me know if you need anything else or have any questions.

1. Correct source contact information:

Denise Kohtala
[phone]
[e-mail]
2755 E Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121

2. Confirming name and mailing address of Permittee:

1/14/25, 12:58 PM State of Utah Mail - Update to Kern River Gas Transmission Company Milford Compressor Station Approval Order
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-8237873725216578545&simpl=msg-a:r68261955281872…5/7
Kern River Gas Transmission Company
2755 E Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121

3. Confirming permit location:

Kern River Gas Transmission Company Milford Compressor Station
800 East 7900 South
Minersville, Utah 84012

4. Please provide the name, phone number, email, and mailing address for the billing contact:

Denise Kohtala
[phone]
[e-mail]
2755 E Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121

Reed Kitchen
[phone]
[e-mail]
2755 E Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121

Brittany McBride
[phone]
[e-mail]
2755 E Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121

5. Equipment on site:

No change from listed equipment

Thank you,
1/14/25, 12:58 PM State of Utah Mail - Update to Kern River Gas Transmission Company Milford Compressor Station Approval Order
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-8237873725216578545&simpl=msg-a:r68261955281872…6/7

Reed Kitchen
Environmental Specialist
[e-mail]
Phone: [phone]
Cell: 801-946-7805
[Quoted text hidden]
1/14/25, 12:58 PM State of Utah Mail - Update to Kern River Gas Transmission Company Milford Compressor Station Approval Order
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-8237873725216578545&simpl=msg-a:r68261955281872…7/7