DAQ-2024-004472

DAQE-AN107560012-24

{{$d1 }}.

Derek Forsberg
Northwest Pipeline LLC
295 Chipeta Way
Salt Lake City, UT 84108
[e-mail]

Dear Mr. Forsberg:

Re: Approval Order: Administrative Amendment to Approval Order DAQE-AN0107560007-10 to
Remove a Turbine under R307-401-12 Reduction in Air Pollutants
Project Number: N107560012

The attached Approval Order (AO) is issued pursuant to the Notice of Intent (NOI) received on October
30, 2023. Northwest Pipeline LLC must comply with the requirements of this AO, all applicable state
requirements (R307), and Federal Standards.

The project engineer for this action is Dungan Adams, 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. No public comments were
received on this action.

Sincerely,

{{$s }}

Bryce C. Bird
Director

BCB:DA:jg

cc: TriCounty Health Department
DJ Law, 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

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

January 9, 2024

STATE OF UTAH
Department of Environmental Quality
Division of Air Quality

{{#s=Sig_es_:signer1:signature}}
{{#d1=date1_es_:signer1:date:format(date, "mmmm d, yyyy")}}
{{#d2=date1_es_:signer1:date:format(date, "mmmm d, yyyy"):align(center)}}

APPROVAL ORDER
DAQE-AN107560012-24 Administrative Amendment to
Approval Order DAQE-AN0107560007-10 to Remove a Turbine
under R307-401-12 Reduction in Air Pollutants

Prepared By
Dungan Adams, Engineer
[phone]
[e-mail]

Issued to
Northwest Pipeline LLC - Vernal Compressor Station

Issued On
{{$d2 }}

Issued By

{{$s }}

Bryce C. Bird
Director
Division of Air Quality

January 9, 2024
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-AN107560012-24
Page 3

GENERAL INFORMATION

CONTACT/LOCATION INFORMATION

Owner Name Source Name
Northwest Pipeline LLC Northwest Pipeline LLC - Vernal Compressor
Station

Mailing Address Physical Address
295 Chipeta Way Remote Location 13 Miles Northeast of Vernal
Salt Lake City, UT 84108 Vernal, UT 84078

Source Contact UTM Coordinates
Name: Derek Forsberg 641,192 m Easting
Phone: [phone],492,188 m Northing
Email: [e-mail] Datum NAD83
UTM Zone 12

SIC code 4922 (Natural Gas Transmission)

SOURCE INFORMATION
General Description
Northwest Pipeline LLC (Northwest) operates a natural gas compressor station in Vernal, Utah. The
Vernal Compressor Station is located approximately 13 miles northeast of Vernal, and consists of one (1)
turbine compressor, one (1) emergency generator, and one (1) fuel gas heater.

NSR Classification
Administrative Amendment

Source Classification
Located in Uinta Basin O3 NAA
Uintah 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
DAQE-AN107560012-24
Page 4

Project Description
Northwest is requesting to remove a Stationary Gas Turbine Compressor (Solar Centaur 40-4700S). The
turbine compressor, listed as T-1 in active AO DAQE-AN0107560007-10, is inoperable and no longer in
use.

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)
CO2 Equivalent 0 38728.00
Carbon Monoxide -21.67 38.38
Nitrogen Oxides -17.46 31.50
Particulate Matter - PM10 -1.20 2.26
Particulate Matter - PM2.5 -1.20 2.26
Sulfur Dioxide -2.61 4.73
Volatile Organic Compounds -5.62 11.47

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Formaldehyde (CAS #50000) -1400 1840
Generic HAPs (CAS #GHAPS) 0 140
Toluene (CAS #108883) 0 100
Change (TPY) Total (TPY)
Total HAPs -0.70 1.04

SECTION I: GENERAL PROVISIONS

I.1 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.2 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401]

I.3 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.4 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]

DAQE-AN107560012-24
Page 5

I.5 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.6 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns.
[R307-107]

I.7 The owner/operator shall comply with UAC R307-150 Series. Emission Inventories.
[R307-150]

SECTION II: PERMITTED EQUIPMENT

II.A THE APPROVED EQUIPMENT

II.A.1 Turbine Compressor Station

II.A.2 Turbine Compressor
Manufacturer: Solar Turbines, Incorporated
Model: Taurus 70-10302S
Size: 9,755 hp (at 6,100 feet elev. and 0 degrees F)
Fuel Usage: 662.2 MMscf/yr
NSPS Applicability: Subpart KKKK

II.A.3 Emergency Generator Engine
Manufacturer: Caterpillar
Model: G3412
Size: 637 hp
Type: 4-Stroke Rich Burn
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.4 Line Heater
Size: 0.5 MMBtu/hr

DAQE-AN107560012-24
Page 6

SECTION II: SPECIAL PROVISIONS

II.B REQUIREMENTS AND LIMITATIONS

II.B.1 Site Requirements
II.B.1.a The owner/operator shall not allow visible emissions from the following emission points to
exceed the following values:

A. All-natural gas fuel burning equipment with an exhaust stack - 10% opacity

B. All other points - 20% opacity.

[R307-401-8]

II.B.1.a.1 Opacity observations of emissions from stationary sources shall be conducted in accordance to
40 CFR 60, Appendix A, Method 9. [R307-401-8]

II.B.1.b The owner/operator shall only use natural gas as fuel in the turbine compressor engine, natural
gas emergency generator, and line heater. [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.a.1 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.a.2 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.a.3 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.a.4 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.a.5 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 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]

DAQE-AN107560012-24
Page 7

II.B.2.b.1 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.b.2 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.b.3 CO
40 CFR 60, Appendix A, Method 10 or other EPA-approved testing method as acceptable to the
Director. [R307-401-8]

II.B.3 Turbine Compressor Engine Requirements
II.B.3.a The owner/operator shall not emit more than the following rates and concentrations from the
turbine compressor:

Pollutant lb/hr ppmdv
NOx 7.11 25
CO 8.66 50

Concentration (ppmdv) is corrected to 15% oxygen, dry basis.

[R307-401-8]

II.B.3.a.1 Compliance Demonstration
To demonstrate compliance with the emission limitations above, the owner/operator shall
perform stack testing on the emissions unit according to the stack testing conditions contained in
this AO. [R307-165-2, R307-401-8]

II.B.3.a.2 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.3.a.3 Test Frequency
The owner/operator shall conduct a stack test on the emission unit within 5 years after the date of
the most recent stack test of the emission unit. The Director may require the owner/operator to
perform a stack test at any time. [R307-165-2, R307-401-8]

II.B.4 Emergency Generator Engine Requirements
II.B.4.a The owner/operator shall not operate the emergency engine 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 engine during emergencies. [40 CFR 63 Subpart ZZZZ, R307-401-8]

DAQE-AN107560012-24
Page 8

II.B.4.a.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 the emergency engine shall be kept in a log and shall include the
following:

A. The date the emergency engine was used

B. The duration of operation in hours

C. The reason for the emergency engine usage.

[40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.4.a.2 To determine the duration of operation, the owner/operator shall install a non-resettable hour
meter for the emergency engine. [40 CFR 63 Subpart ZZZZ, R307-401-8]

PERMIT HISTORY

This Approval Order shall supersede (if a modification) or will be based on the following documents:

Supersedes AO DAQE-AN0107560007-10 dated May 4, 2010
Is Derived From NOI dated October 30,2023
Incorporates Additional Information dated August 28, 2023
Incorporates Additional Information dated October 30, 2023

DAQE-AN107560012-24
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-

RN107560012
December 21, 2023

Derek Forsberg
Northwest Pipeline LLC
295 Chipeta Way
Salt Lake City, UT 84108
[e-mail]

Dear Derek Forsberg,

Re: Engineer Review:
Administrative Amendment to AO DAQE-AN0107560007-10 to Remove a Turbine, under
R307-401-12 Reduction in Air Pollutants
Project Number: N107560012

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. Northwest
Pipeline LLC should complete this review within 10 business days of receipt.

Northwest Pipeline LLC should contact Dungan Adams at [phone] if there are questions or
concerns with the review of the draft permit conditions. Upon resolution of your concerns, please email
Dungan Adams 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 Northwest Pipeline LLC does not respond to this letter within 10 business days, the project will move
forward without source concurrence. If Northwest Pipeline LLC has concerns that cannot be resolved and
the project becomes stagnant, the DAQ Director may issue an Order prohibiting construction.

Approval Signature ____________12/22/23___________________________________
(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 N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 1
UTAH DIVISION OF AIR QUALITY
ENGINEER REVIEW

SOURCE INFORMATION

Project Number N107560012
Owner Name Northwest Pipeline LLC
Mailing Address 295 Chipeta Way
Salt Lake City, UT, 84108

Source Name Northwest Pipeline LLC- Vernal Compressor Station
Source Location Remote Location
13 Miles Northeast of Vernal
Vernal, UT 84078

UTM Projection 641,192 m Easting, 4,492,188 m Northing
UTM Datum NAD83
UTM Zone UTM Zone 12
SIC Code 4922 (Natural Gas Transmission)

Source Contact Derek Forsberg
Phone Number [phone]
Email [e-mail]

Billing Contact Derek Forsberg
Phone Number [phone]
Email [e-mail]

Project Engineer Dungan Adams, Engineer
Phone Number [phone]
Email [e-mail]

Notice of Intent (NOI) Submitted October 30, 2023
Date of Accepted Application November 30, 2023

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 2
SOURCE DESCRIPTION

General Description
Northwest Pipeline LLC (Northwest) operates a natural gas compressor station in Vernal, Utah.
The Vernal Compressor Station is located approximately 13 miles northeast of Vernal, and
consists of one (1) turbine compressor, one (1) emergency generator, and one (1) fuel gas heater.

NSR Classification:
Administrative Amendment

Source Classification
Located in Uinta Basin O3 NAA
Uintah 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 AO DAQE-AN0107560007-10 to Remove a Turbine, under
R307-401-12 Reduction in Air Pollutants

Project Description
Northwest is requesting to remove a Stationary Gas Turbine Compressor (Solar Centaur 40-
4700S). The turbine compressor, listed as T-1 in active AO DAQE-AN0107560007-10, is
inoperable and no longer in use.

EMISSION IMPACT ANALYSIS
No emissions are increasing, and no threshold levels established in R307-410-4 and R307-410-5 are exceeded.
Therefore, modeling is not required. [Last updated November 28, 2023]

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
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)
CO2 Equivalent 0 38728.00
Carbon Monoxide -21.67 38.38
Nitrogen Oxides -17.46 31.50
Particulate Matter - PM10 -1.20 2.26
Particulate Matter - PM2.5 -1.20 2.26
Sulfur Dioxide -2.61 4.73
Volatile Organic Compounds -5.62 11.47

Hazardous Air Pollutant Change (lbs/yr) Total (lbs/yr)
Formaldehyde (CAS #50000) -1400 1840
Generic HAPs (CAS #GHAPS) 0 140
Toluene (CAS #108883) 0 100
Change (TPY) Total (TPY)
Total HAPs -0.70 1.04

Note: Change in emissions indicates the difference between previous AO and proposed modification.

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 4
Review of BACT for New/Modified Emission Units

1. BACT review regarding Vernal Compressor Station
The project does not increase the potential to emit of any air pollutant or cause emissions of any
new air pollutant. Therefore, a BACT analysis is not required. [Last updated November 28, 2023]

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 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.2 The limits set forth in this AO shall not be exceeded without prior approval. [R307-401]

I.3 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.4 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.5 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.6 The owner/operator shall comply with UAC R307-107. General Requirements: Breakdowns.
[R307-107]

I.7 The owner/operator shall comply with UAC R307-150 Series. Emission Inventories. [R307-
150]

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 5
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 Turbine Compressor Station

II.A.2 Turbine Compressor
Manufacturer: Solar Turbines, Inc.
Model: Taurus 70-10302S
Size: 9,755 hp (at 6,100 feet elev. and 0 degrees F)
Fuel Usage: 662.2 MMscf/yr
NSPS Applicability: Subpart KKKK

II.A.3 Emergency Generator Engine
Manufacturer: Caterpillar
Model: G3412
Size: 637 hp
Type: 4-Stroke Rich Burn
NSPS Applicability: Subpart JJJJ
MACT Applicability: Subpart ZZZZ

II.A.4 Line Heater
Size: 0.5 MMBtu/hr

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 Requirements
II.B.1.a
NEW
The owner/operator shall not allow visible emissions from the following emission points to
exceed the following values:

A. All natural gas fuel burning equipment with an exhaust stack - 10% opacity

B. All other points - 20% opacity. [R307-401-8]

II.B.1.a.1
NEW
Opacity observations of emissions from stationary sources shall be conducted in accordance to
40 CFR 60, Appendix A, Method 9. [R307-401-8]

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 6
II.B.1.b
NEW
The owner/operator shall only use natural gas as fuel in the turbine compressor engine, natural
gas emergency generator, and line heater. [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.a.1
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.a.2
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]

II.B.2.a.3
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.a.4
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.a.5
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
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.b.1
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.b.2
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]

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 7
II.B.2.b.3
NEW
CO
40 CFR 60, Appendix A, Method 10 or other EPA-approved testing method as acceptable to
the Director. [R307-401-8]

II.B.3
NEW
Turbine Compressor Engine Requirements
II.B.3.a
NEW
The owner/operator shall not emit more than the following rates and concentrations from the
turbine compressor:

Pollutant lb/hr ppmdv
NOx 7.11 25
CO 8.66 50

Concentration (ppmdv) is corrected to 15% oxygen, dry basis. [R307-401-8]

II.B.3.a.1
NEW
Compliance Demonstration
To demonstrate compliance with the emission limitations above, the owner/operator shall
perform stack testing on the emissions unit according to the stack testing conditions contained
in this AO. [R307-165-2, R307-401-8]

II.B.3.a.2
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.3.a.3
NEW
Test Frequency
The owner/operator shall conduct a stack test on the emission unit within 5 years after the date
of the most recent stack test of the emission unit. The Director may require the owner/operator
to perform a stack test at any time. [R307-165-2, R307-401-8]

II.B.4 Emergency Generator Engine Requirements
II.B.4.a
NEW
The owner/operator shall not operate the emergency engine 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 engine during emergencies. [40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.4.a.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 the emergency engine shall be kept in a log and shall
include the following:

A. The date the emergency engine was used

B. The duration of operation in hours

C. The reason for the emergency engine usage. [40 CFR 63 Subpart ZZZZ, R307-401-8]

II.B.4.a.2
NEW
To determine the duration of operation, the owner/operator shall install a non-resettable hour
meter for the emergency engine. [40 CFR 63 Subpart ZZZZ, R307-401-8]

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 8
PERMIT HISTORY

When issued, the approval order shall supersede (if a modification) or will be based on the
following documents:

Supersedes DAQE-AN0107560007-10 dated May 4, 2010
Incorporates Additional Information dated August 28, 2023
Incorporates Additional Information dated October 30, 2023

REVIEWER COMMENTS

1. Comment regarding Turbine Compressor:
Northwest Pipeline LLC has requested an administrative amendment to remove the Solar Centaur 40
Turbine from the Approval Order (AO). The turbine is inoperable and no longer in use. All
emissions estimates decrease due to the removal of the turbine. No other changes are made to the
AO other than updating, language, company, and contact information. [Last updated November 30,
2023]

2. Comment regarding Federal Subpart Applicability:
NSPS Subpart KKKK
40 CFR Part 60, Subpart KKKK (Standards of Performance for Stationary Combustion Turbines)
applies to all stationary combustion turbines with peak load greater than 10MMBtu/hr which
commenced construction, modification, or reconstruction after February 18, 2005. The Solar Taurus
70 turbine engine was added to the site January 4, 2010; therefore, the turbine engine is subject to
NSPS Subpart KKKK.

NSPS Subpart GG
40 CFR Part 60, Subpart GG (Standards of Performance for Stationary Gas Turbines) does not apply
to stationary combustion turbines regulated under NSPS Subpart KKKK. Therefore, the turbine
engine is exempt from NSPS Subpart GG requirements.

MACT Subpart ZZZZ
40 CFR Part 63, Subpart ZZZZ (National Emissions Standards for Hazardous Air Pollutants for
Stationary Reciprocating Internal Combustion Engines) applies to stationary reciprocating internal
combustion engines (RICE) that are located at an area source of HAP emissions. The stationary
engine is located at an area source of HAP emissions; therefore, it is subject to MACT Subpart
ZZZZ and must meet the requirements of Subpart JJJJ. No further requirements apply to this engine
under Subpart ZZZZ.

NSPS Subpart JJJJ
40 CFR Part 60, Subpart JJJJ (Standards of Performance for Stationary Spark Ignition Internal
Combustion Engines) applies to emergency stationary spark ignition (SI) internal combustion
engines (ICE) manufactured after January 1, 2009, and is required by MACT Subpart ZZZZ.
Therefore, the stationary emergency generator is subject to NSPS Subpart JJJJ.

[Last updated November 30, 2023]

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 9
3. 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 facility is not a major source and is not a Title IV source. This facility is subject to 40 CFR 60
(NSPS) regulations and 40 CFR 63 (MACT) regulations that do not specifically exempt it from Title
V. Therefore, Title V applies to this facility as an area source. [Last updated November 28, 2023]

Engineer Review N107560012: Northwest Pipeline LLC- Vernal Compressor Station
December 21, 2023
Page 10
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

lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 7.11 31.14 8.66 37.92 2.48 10.86 1.08 4.73 0.51 2.24
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 500 2.81 0.70 5.62 1.40 1.53 0.38 7E-02 2E-02 0.10 0.02
Exist HTR-01 na Line Heater 0.50 MMBtu/hr 8,760 0.05 0.21 0.04 0.18 3E-03 0.01 3E-04 1E-03 4E-03 0.02
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- --- ---2E-03 0.01 --- --- --- ---
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- --- ---0.03 0.14 --- --- --- ---
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- --- ---2E-03 0.01 --- --- --- ---
9.97 32.06 14.32 39.50 4.05 11.42 1.15 4.75 0.61 2.28
100 100 100 100 100
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 ------------0.08 0.36 ------------
--- --- --- ---0.08 0.36 --- --- --- ---
9.97 32.06 14.32 39.50 4.14 11.78 1.15 4.75 0.61 2.28
na na na na na
* = lb/hr is based on 8,760 hr/yr.
Northwest Pipeline, LLC
Vernal Compressor Station
Potential to Emit Calculations
Site Rating PM10/2.5SO2VOC (w/HCHO)CONOxStatusDescriptionSource
ID APCE hr/yr*
Criteria Pollutants - Controlled
Emission Estimates - Page 01 of 10 Potential to Emit CalculationsCriteria Pollutants - ControlledVernal Compressor Station
Vernal Compressor Station - Point Sources
Point Sources:
TVOP Threshold:
Grand Total:
Fugitive Sources:
Vernal Compressor Station - Fugitive Sources
Vernal Compressor Station - Grand Total
TVOP Threshold:
lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 3E-03 0.01 5E-04 2E-03 7E-05 3E-04 3E-05 1E-04 2E-03 1E-02 0.20 0.89 --- ---
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 500 1E-02 4E-03 1E-02 3E-03 0.01 2E-03 3E-03 8E-04 1E-04 3E-05 0.10 0.03 --- --
Exist HTR-01 na Line Heater 0.5 MMBtu/hr 8,760 --- --- --- ---1E-06 5E-06 --- --- --- ---4E-05 2E-04 9E-04 4E-03
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- --- ---8E-06 4E-05 --- ---8E-06 4E-05 --- ---2E-05 9E-05
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- --- ---1E-04 5E-04 --- ---1E-04 5E-04 --- ---3E-04 1E-03
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- --- ---8E-06 4E-05 --- ---8E-06 4E-05 --- ---2E-05 9E-05
0.02 0.02 0.01 5E-03 0.01 3E-03 3E-03 1E-03 3E-03 0.01 0.31 0.92 1E-03 5E-03
na na na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 --- --- --- ---3E-04 1E-03 --- ---3E-04 1E-03 --- ---7E-04 3E-03
--- --- --- ---3E-04 1E-03 --- ---3E-04 1E-03 --- ---7E-04 3E-03
0.02 0.02 0.01 5E-03 0.01 4E-03 3E-03 1E-03 3E-03 0.01 0.31 0.92 2E-03 0.01
10 10 10 10 10 10 10
* = lb/hr is based on 8,760 hr/yr.
Potential to Emit Calculations
Vernal Compressor Station
Emission Estimates - Page 02 of 10
Hazardous Air Pollutants (HAP) - Controlled - Part 01 of 02
Status Source
ID APCE Description Site Rating Butadiene n-HexaneHCHOEthylbenzene
Vernal Compressor Station
Vernal Compressor Station - Point Sources
Northwest Pipeline, LLC
hr/yr*BenzeneAcetaldehydeAcrolein
Hazardous Air Pollutants (HAP) - Controlled - Part 01 of 02
Potential to Emit Calculations
TVOP Threshold:
Point Sources:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
Fugitive Sources:
Vernal Compressor Station - Grand Total
Grand Total:
lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 --- ---3E-03 0.01 1E-02 0.04 --- ---5E-03 0.02 2E-03 1E-02 0.23 1.01
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 500 0.02 4E-03 1E-03 3E-04 3E-03 7E-04 3E-03 8E-04 1E-03 2E-04 9E-04 2E-04 0.17 0.04
Exist HTR-01 na Line Heater 0.5 MMBtu/hr 8,760 --- ---8E-05 4E-04 2E-06 7E-06 --- --- --- ---6E-07 3E-06 1E-03 4E-03
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 4E-05 2E-04 ------8E-06 4E-05 8E-06 4E-05 8E-06 4E-05 ------1E-04 4E-04
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 6E-04 3E-03 ------1E-04 5E-04 1E-04 5E-04 1E-04 5E-04 ------1E-03 6E-03
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 4E-05 2E-04 ------8E-06 4E-05 8E-06 4E-05 8E-06 4E-05 ------1E-04 4E-04
0.02 7E-03 4E-03 0.01 0.01 0.05 3E-03 1E-03 0.01 0.02 3E-03 0.01 0.40 1.06
na na na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 1E-03 0.01 --- ---3E-04 1E-03 3E-04 1E-03 3E-04 1E-03 --- ---4E-03 0.02
1E-03 0.01 --- ---3E-04 1E-03 3E-04 1E-03 3E-04 1E-03 --- ---4E-03 0.02
0.02 0.01 4E-03 0.01 0.01 0.05 4E-03 3E-03 0.01 0.02 3E-03 0.01 0.40 1.08
10 10 10 10 10 10 25
* = lb/hr is based on 8,760 hr/yr.
Northwest Pipeline, LLC
Vernal Compressor Station
Potential to Emit Calculations
Status Source
ID
Vernal Compressor Station - Point Sources
Hazardous Air Pollutants (HAP) - Controlled - Part 02 of 02
APCE Description Site Rating hr/yr*Methanol Toluene 2,2,4-TMP Trace/Other HAP Total HAPPOM/PAH Xylenes
Vernal Compressor Station Hazardous Air Pollutants (HAP) - Controlled - Part 02 of 02 Potential to Emit CalculationsEmission Estimates - Page 03 of 10
Vernal Compressor Station - Grand Total
Grand Total:
TVOP Threshold:
Fugitive Sources:
Point Sources:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
CO2 CO2e CH4 CO2e N2O CO2e
GWP:1 GWP:25 GWP:298
MMBtu/hr tpy tpy tpy tpy tpy tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 0.00 37,148 37,148 11.82 295.50 1.01 301.91 8,618 37,746
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 500 5.03 138.46 138.46 0.29 7.24 3E-04 0.08 583 145.78
Exist HTR-01 na Line Heater 0.50 MMBtu/hr 8,760 0.50 258 258 5E-03 0.12 5E-03 1.41 59 259
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- ------ --- --- --- ------
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- ------ --- --- --- ------
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- ------ --- --- --- ------
5.53 37,544 37,544 12 303 1.02 303.40 9,260 38,151
na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 ---0.01 0.01 27.76 694 --- ---158.47 694
---0.01 0.01 27.76 694 --- ---158.47 694
5.53 37,544 37,544 40 997 1.02 303.40 9,418 38,845
na na na na na
* = lb/hr is based on 8,760 hr/yr.
Vernal Compressor Station - Point Sources
Greenhouse Gas (GHG) Pollutants - Controlled
Potential to Emit Calculations
Vernal Compressor Station
Northwest Pipeline, LLC
Description Site Rating hr/yr*Status Source
ID
TOTAL
CO2e
Heat Input
(HHV)APCE
Emission Estimates - Page 04 of 10
Greenhouse Gas (GHG) Pollutants - Controlled Potential to Emit CalculationsVernal Compressor Station
Point Sources:
TVOP Threshold:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
Fugitive Sources:
Vernal Compressor Station - Grand Total
Grand Total:
lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 7.11 31.14 8.66 37.92 2.48 10.86 0.20 0.89 0.23 1.01 8,618 37,746
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 500 ------------------0.10 0.03 0.17 0.04 583 146
Exist HTR-01 na Line Heater 0.5 MMBtu/hr 8,760 0.05 0.21 0.04 0.18 3E-03 0.01 4E-05 2E-04 1E-03 4E-03 59 259
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- --- ---2E-03 0.01 --- ---1E-04 4E-04 ------
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- --- ---0.03 0.14 --- ---1E-03 0.01 ------
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- --- ---2E-03 0.01 --- ---1E-04 4E-04 ------
7.16 31.35 8.70 38.10 2.52 11.03 0.31 0.92 0.40 1.06 9,260 38,151
na na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 ------------0.08 0.36 --- ---4E-03 0.02 158.66 694
--- --- --- ---0.08 0.36 --- ---4E-03 0.02 159 694
7.16 31.35 8.70 38.10 2.60 11.40 0.31 0.92 0.40 1.08 9,419 38,845
* = lb/hr is based on 8,760 hr/yr.
Northwest Pipeline, LLC
CO2e
Pre-Controlled Emissions Summary
Potential to Emit Calculations
Vernal Compressor Station
hr/yr*HCHOCO
Vernal Compressor Station - Point Sources
Grand Total:
Vernal Compressor Station - Grand Total
NOx VOC (w/HCHO)Total HAPStatusSource
ID APCE Description Site Rating
Vernal Compressor Station - Fugitive Sources
Point Sources:
TVOP Threshold:
Fugitive Sources:
Emission Estimates - Page 05 of 10
Pre-Controlled Emissions SummaryVernal Compressor Station Potential to Emit Calculations
lb/MMBtu (0oF)lb/hr (0oF)tpy (0oF)lb/hr (0oF)tpy (0oF)
Vendor Data NOx (25 ppm)0.100 7.11 31.14 ---7.11 31.14
Vendor Data CO (50 ppm)0.122 8.66 37.92 ---8.66 37.92
Vendor Data UHC (CH4) (25 ppm)0.035 2.48 10.86 ---2.48 10.86
Vendor Data (PIL 168)VOC (UHC*100%)0.035 2.48 10.86 ---2.48 10.86
9,755 bhp (Max @ 0oF)Tariff Specification SO2 0.014 1.08 4.73 ---1.08 4.73
8,474 bhp (Avg @ 40oF)AP-42 Table 3.1-2b PM10/2.5 0.007 0.51 2.24 ---0.51 2.24
8,760 hr/yr AP-42 Table 3.1-3 Acetaldehyde 4.00E-05 3E-03 0.01 ---3E-03 0.01
AP-42 Table 3.1-3 Acrolein 6.40E-06 5E-04 2E-03 ---5E-04 2E-03
AP-42 Table 3.1-3 Benzene 9.10E-07 7E-05 3E-04 ---7E-05 3E-04
AP-42 Table 3.1-3 Butadiene, 1,3-4.30E-07 3E-05 1E-04 ---3E-05 1E-04
AP-42 Table 3.1-3 Ethylbenzene 3.20E-05 2E-03 0.01 ---2E-03 0.01
Vendor Data (PIL 168)Formaldehyde 2.65E-03 0.20 0.89 ---0.20 0.89
AP-42 Table 3.1-3 n-Hexane --- --- --- --- --- ---
AP-42 Table 3.1-3 Methanol --- --- --- --- --- ---
AP-42 Table 3.1-3 POM/PAH 3.47E-05 3E-03 0.01 ---3E-03 0.01
AP-42 Table 3.1-3 Toluene 1.30E-04 1E-02 0.04 ---1E-02 0.04
8,084 Btu/bhp-hr (HHV)AP-42 Table 3.1-3 TMP, 2,2,4- --- --- --- --- --- ---
77.10 MMBtu/hr (Max @ 0oF)AP-42 Table 3.1-3 Xylenes 6.40E-05 5E-03 0.02 ---5E-03 0.02
AP-42 Table 3.1-3 Other/Trace HAP 2.90E-05 2E-03 0.01 ---2E-03 0.01
75,591 scf/hr (Max @ 0oF)Sum Total HAP 2.98E-03 0.23 1.01 ---0.23 1.01
AP-42 Table 3.1-3 CO2 (GWP=1)110 8,481 37,148 ---8,481 37,148
662 MMscf/yr Vendor Data CH4 (GWP=25)0.035 2.70 11.82 ---2.70 11.82
1,020 Btu/scf (HHV)AP-42 Table 3.1-3 N2O (GWP=298)0.003 0.23 1.01 ---0.23 1.01
Weighted Sum CO2e 112 8,618 37,746 ---8,618 37,746
Notes:1 - The emissions shown are based on operation at 100% of rated load for 8,760 hr/yr.
2 - PM10/2.5 is filterable and condensable particulate matter; including PM10 and PM2.5
5. SO2 emissions based maximum total sulfur content in natural gas tarriff limit of 5 grains/100 scf
and assumption that all sulfur in the fuel is converted to SO2. See below.
SO2 EF (lb/MMscf) = (5 gr S/100 scf) x (lb/7000 gr) x (lb-mol/16 lb S) x (32 lb SO2/lb-mol) x (1,000,000 scf/MMscf)
= 14.28 lb/MMscf
Calculation Example for Solar Centaur 40 SO² Emissions:
4.73 tons SO2
year
Northwest Pipeline, LLC
Vernal Compressor Station
Potential to Emit Calculations
Compressor Turbine (CT-01) Emissions
Source
ID Description Reference Pollutant
Controlled
Emissions Control
Efficiency
Controlled
Emissions
CT-01
Compressor Turbine 01
Solar Taurus 70-10302S
Manufactured ≥ 02/18/05
NSPS KKKK Affected
3 - "Other/Trace HAPs" includes: Carbon Tetrachloride, Chlorobenzene, Chloroform, Dichloropropene, 1,3-Dichloropropene, Ethylene Dibromide, Methylene
Chloride, Phenol, Propylene Oxide, Styrene, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, and Vinyl Chloride (as per AP-42).
4 - The fuel heating value will vary, 1,020 Btu/scf (HHV) is at the low end of the range and results in a high (conservative) fuel consumption estimate. (It does NOT
impact the emission estimates.)
Vernal Compressor Station Compressor Turbine (CT-01) Emissions Potential to Emit Calculations
Emission Estimates - Page 06 of 10
14.28 lbs SO2 662 MMSCF
MMSCF year
g/bhp-hr lb/MMBtu lb/hr tpy g/bhp-hr lb/hr tpy
NSPS JJJJ NOx ------------ ---2.00 2.81 0.70
NSPS JJJJ CO ------------ ---4.00 5.62 1.40
NSPS JJJJ NMNEHC ------------ ---1.00 1.40 0.35
NSPS JJJJ VOC (w/Aldehydes)------------ ---1.09 1.53 0.38
Tariff Specification SO2 5.02E-02 1.40E-02 0.07 0.02 ---0.05 0.07 0.02
AP-42 Table 3.2-3 PM10/2.5 6.96E-02 1.94E-02 0.10 0.02 ---0.07 0.10 0.02
637 bhp AP-42 Table 3.2-3 Acetaldehyde*1.00E-02 2.79E-03 0.01 4E-03 ---0.01 0.01 4E-03
500 hr/yr AP-42 Table 3.2-3 Acrolein*9.43E-03 2.63E-03 0.01 3E-03 ---0.01 0.01 3E-03
1,800 rpm, 6 cyl AP-42 Table 3.2-3 Benzene 5.66E-03 1.58E-03 0.01 2E-03 ---6E-03 0.01 2E-03
AP-42 Table 3.2-3 Butadiene, 1,3-2.38E-03 6.63E-04 3E-03 8E-04 ---2E-03 3E-03 8E-04
AP-42 Table 3.2-3 Ethylbenzene 8.89E-05 2.48E-05 1E-04 3E-05 ---9E-05 1E-04 3E-05
AP-42 Table 3.2-3 Formaldehyde*7.35E-02 2.05E-02 0.10 0.03 ---0.07 0.10 0.03
AP-42 Table 3.2-3 n-Hexane --- --- --- --- --- --- --- --
AP-42 Table 3.2-3 Methanol 1.10E-02 3.06E-03 0.02 4E-03 ---1E-02 0.02 4E-03
AP-42 Table 3.2-3 POM/PAH 8.54E-04 2.38E-04 1E-03 3E-04 ---9E-04 1E-03 3E-04
AP-42 Table 3.2-3 Toluene 2.00E-03 5.58E-04 3E-03 7E-04 ---2E-03 3E-03 7E-04
AP-42 Table 3.2-3 TMP, 2,2,4-2.38E-03 6.63E-04 3E-03 8E-04 ---2E-03 3E-03 8E-04
AP-42 Table 3.2-3 Xylenes 6.99E-04 1.95E-04 1E-03 2E-04 ---7E-04 1E-03 2E-04
7,904 Btu/bhp-hr (HHV)AP-42 Table 3.2-3 Other/Trace HAP 6.42E-04 1.79E-04 9E-04 2E-04 ---6E-04 9E-04 2E-04
5.03 MMBtu/hr (HHV)Sum Total HAP 0.12 0.03 0.17 0.04 ---0.12 0.17 0.04
4,936 scf/hr AP-42 Table 3.2-3 CO2 (GWP=1)394.37 110.00 553.83 138 ---394.37 554 138
2.47 MMscf/yr AP-42 Table 3.2-3 CH4 (GWP=25)0.82 0.23 1.16 0.29 ---0.82 1.16 0.29
1,020 Btu/scf (HHV)40CFR98 - Table C2 N2O (GWP=298)7.90E-04 2.20E-04 1E-03 3E-04 ---8E-04 1E-03 3E-04
Weighted Sum CO2e 415.22 115.82 583 146 ---415.22 583 145.78
* = Aldehyde
Notes:1 - Pre-controlled and controlled emissions shown are based on operation at 100% of rated load for 500 hr/yr.
2 - As per vendor specifications, NMNEHC (non-methane/non-ethane hydrocarbons) do NOT include aldehydes. VOC is the sum of NMNEHC, Acetaldehyde, Acrolein, and Formaldehyde.
3 - PM10/2.5 is filterable and condensable particulate matter; including PM10 and PM2.5
5 - The fuel heating value will vary, 1,020 Btu/scf (HHV) is at the low end of the range and results in a high (conservative) fuel consumption estimate. (It does NOT impact the emission estimates.)
6. SO2 emissions based maximum total sulfur content in natural gas tarriff limit of 5 grains/100 scf
and assumption that all sulfur in the fuel is converted to SO2. See below.
SO2 EF (lb/MMscf) = (5 gr S/100 scf) x (lb/7000 gr) x (lb-mol/16 lb S) x (32 lb SO2/lb-mol) x (1,000,000 scf/MMscf)
= 14.28 lb/MMscf
Emergency Generator Engine (GE-01) Emissions
Potential to Emit Calculations
Vernal Compressor Station
Northwest Pipeline, LLC
4 - "Other/Trace HAPs" includes: Carbon Tetrachloride, Chlorobenzene, Chloroform, Dichloropropene, 1,3-Dichloropropene, Ethylene Dibromide, Methylene Chloride, Phenol, Propylene Oxide, Styrene,
1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, and Vinyl Chloride (as per AP-42).
Source
ID Description Reference Pollutant
Pre-Controlled
Emissions Control
Efficiency
Controlled
Emissions
GE-01
Emergency Generator Engine 01
Caterpillar G3412 (4SRB)
Manufactured After 01/01/2009
NSPS JJJJ Affected
Vernal Compressor Station Potential to Emit CalculationsEmission Estimates - Page 07 of 10
Emergency Generator Engine (GE-01) Emissions
lb/MMscf lb/MMBtu lb/hr tpy
NOx 100.00 9.8E-02 0.05 0.21
CO 84.00 8.2E-02 0.04 0.18
NMNEHC 5.50 5.4E-03 3E-03 0.01
VOC 5.50 5.4E-03 3E-03 0.01
SO2 0.60 5.9E-04 3E-04 1E-03
PM10/2.5 7.60 7.5E-03 4E-03 0.02
Acetaldehyde --- --- --- ---
Acrolein --- --- --- ---
Benzene 2.10E-03 2.1E-06 1E-06 5E-06
1,3-Butadiene --- --- --- ---
Ethylbenzene --- --- --- ---
Formaldehyde 7.50E-02 7.4E-05 4E-05 2E-04
n-Hexane 1.80 1.8E-03 9E-04 4E-03
Methanol --- --- --- ---
0.50 MMBtu/hr (HHV)POM/PAH 1.72E-01 1.7E-04 8E-05 4E-04
Toluene 3.40E-03 3.3E-06 2E-06 7E-06
2,2,4-TMP --- --- --- ---
1,020 Btu/scf (HHV)Xylenes --- --- --- ---
Other/Trace HAP 1.20E-03 1.2E-06 6E-07 3E-06
8,760 hr/yr Total HAP 2.05 2.0E-03 1E-03 4E-03
490 scf/hr CO2 (GWP=1)120,000 117.65 58.82 258
4.29 MMscf/yr CH4 (GWP=25)2.30 2.3E-03 1E-03 5E-03
4,380 MMBtu/yr N2O (GWP=298)2.20 2.2E-03 1E-03 5E-03
CO2e 120,713 118.35 59.17 259
Notes:1 - The emissions shown are based on operation at 100% of rated load for 8,760 hr/yr. Actual load and operating hours will be less.
2 - The fuel heating value will vary, 1,020 Btu/scf (HHV) is at the low end of the range and results in a high (conservative) fuel consumption estimate.
3 - PM10/2.5 is filterable and condensable particulate matter; including PM10 and PM2.5
Potential to Emit Calculations
EPA AP-42 Table 1.4-2
Northwest Pipeline, LLC
Vernal Compressor Station
Potential to Emit Calculations
Fuel Gas Heater (HTR-01) Emissions
Source
ID Description Reference Pollutant
Emission
Factor Emissions
EPA AP-42 Table 1.4-2
EPA AP-42 Table 1.4-2
Capacity:EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-4
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
Sum
EPA AP-42 Table 1.4-2
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
Vernal Compressor Station Fuel Gas Heater (HTR-01) Emissions
Emission Estimates - Page 08 of 10
EPA AP-42 Table 1.4-2
Weighted Sum
4 - "Other/Trace HAPs" includes: Carbon Tetrachloride, Chlorobenzene, Chloroform, Dichloropropene, 1,3-Dichloropropene, Ethylene Dibromide,
Methylene Chloride, Phenol, Propylene Oxide, Styrene, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, and Vinyl Chloride (as per AP-42).
HTR-01
Line Heater 01
EPA AP-42 Table 1.4-1
EPA AP-42 Table 1.4-1
EPA AP-42 Table 1.4-2
EPA AP-42 Table 1.4-2
EPA AP-42 Table 1.4-3
EPA AP-42 Table 1.4-3
Working Breathing Flash 100%VOC na lb/bbl-T-Put
bbl T-O/yr bbl/yr lb/yr lb/yr lb/yr lb/yr tpy lb/hr tpy lb/hr tpy lb/hr tpy
TK-01 Lube Oil 5.95 12 71 10 10 na 20 0.01 2E-03 0.01 ------------
TK-02 Condensate 70 6 420 39 243 na 282 0.14 0.03 0.14 ------------
TK-03 Lubricating Oil 2.38 12 29 10 10 na 20 0.01 2E-03 0.01 ------------
78 7 520 0.16 TOTAL:0.04 0.16 TOTAL:------------
Pre-Control:0.04 0.16 Pre-Control:------------
0.36%VOC 0.36%VOC 0.89%VOC 1.79%VOC 0.36%VOC 0.36%VOC 0.36%VOC 4.46%VOC
lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy
TK-01 8E-06 4E-05 8E-06 4E-05 2E-05 9E-05 4E-05 2E-04 8E-06 4E-05 8E-06 4E-05 8E-06 4E-05 1E-04 4E-04
TK-02 1E-04 5E-04 1E-04 5E-04 3E-04 1E-03 6E-04 3E-03 1E-04 5E-04 1E-04 5E-04 1E-04 5E-04 1E-03 0.01
TK-03 8E-06 4E-05 8E-06 4E-05 2E-05 9E-05 4E-05 2E-04 8E-06 4E-05 8E-06 4E-05 8E-06 4E-05 1E-04 4E-04
TOTAL:1E-04 6E-04 1E-04 6E-04 3E-04 1E-03 7E-04 3E-03 1E-04 6E-04 1E-04 6E-04 1E-04 6E-04 2E-03 0.01
Pre-Control:1E-04 6E-04 1E-04 6E-04 3E-04 1E-03 7E-04 3E-03 1E-04 6E-04 1E-04 6E-04 1E-04 6E-04 2E-03 0.01
Notes:
20%
%Total %VOC
1,087.81 lb/MMscf 1,310.00 lb/MMscf 2.92%234%
39,864 lb/MMscf 42,750 lb/MMscf 95.21%7,634%
3,467 lb/MMscf 0 lb/MMscf 0.00% ---
459.24 lb/MMscf 560.00 lb/MMscf 1.25%100.00%
44,878 lb/MMscf 44,900 lb/MMscf 100.00% ---
---lb/MMscf 2.00 lb/MMscf 0.00%0.36%
---lb/MMscf 2.00 lb/MMscf 0.00%0.36%
---lb/MMscf 5.00 lb/MMscf 0.01%0.89%
Methanol ---lb/MMscf 10.00 lb/MMscf 0.02%1.79%
---lb/MMscf 2.00 lb/MMscf 0.00%0.36%
---lb/MMscf 2.00 lb/MMscf 0.00%0.36%
---lb/MMscf 2.00 lb/MMscf 0.00%0.36%
---lb/MMscf 25.00 lb/MMscf 0.06%4.46%
Toluene 2,2,4-TMPMethanolSource
ID
Benzene Ethylbenzene n-Hexane
Worst Case
Ethylbenzene
VOC
2,2,4-TMP
TOTAL Gas
Xylenes
Total HAP
CO2
n-Hexane
Toluene
Benzene
Total
N2/Water/Ethane/Etc
Pollutant
Vernal Compressor Station Potential to Emit Calculations
1 - The Barr Tank Emission Calculation Spreadsheet Version 1.4.1 was used to determine working and breathing losses from
each storage tank.
Methane (CH4)
Inlet Gas
2 - The results of a representative Inlet Gas Analysis were used to determine the following
worst-case components:
Minimum Contingency:
Control
Efficiency
na
Total HAP
Emission Estimates - Page 09 of 10
Storage Tank (TK-01 thru TK-03) Emissions
Xylene
CH4 GWP = 25
Northwest Pipeline, LLC
Vernal Compressor Station
Potential to Emit Calculations
Storage Tank (TK-01 thru TK-03) Emissions
VOCSource
ID
T-PutCapacityMaterial Stored
PRE-CONTROL (VOC)CH4 CO2eTurnovers
1.25%Wgt 2.92%Wgt 95.21%Wgt
200%lb/hr/Unit lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy
257 514 9.92E-03 ---5.10 22.33 0.06 0.28 0.15 0.01 4.86 21.27 121.53 531.64
--- ---5.29E-03 --- ------ --- --- --- --- --- --- --- ---
30 60 1.94E-02 ---1.16 5.10 0.01 0.06 0.03 1E-03 1.11 4.85 27.74 121.36
73 146 4.41E-04 ---0.06 0.28 8E-04 4E-03 2E-03 8E-05 0.06 0.27 1.53 6.71
120 240 8.60E-04 ---0.21 0.90 3E-03 0.01 0.01 3E-04 0.20 0.86 4.92 21.51
14 28 4.41E-03 ---0.12 0.54 2E-03 0.01 4E-03 2E-04 0.12 0.51 2.94 12.87
TOTAL:494 988 TOTAL:0.08 0.36 0.19 0.01 6.34 27.76 158.66 694.10
PRE-Controlled:0.08 0.36 0.19 9E-03 6.34 27.76 158.66 694
0.36%VOC 0.36%VOC 0.89%VOC 1.79%VOC 0.36%VOC 0.36%VOC 0.36%VOC 4.46%VOC
lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy lb/hr tpy
2E-04 1E-03 2E-04 1E-03 6E-04 2E-03 1E-03 5E-03 2E-04 1E-03 2E-04 1E-03 2E-04 1E-03 3E-03 0.01
--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
5E-05 2E-04 5E-05 2E-04 1E-04 6E-04 3E-04 1E-03 5E-05 2E-04 5E-05 2E-04 5E-05 2E-04 6E-04 3E-03
3E-06 1E-05 3E-06 1E-05 7E-06 3E-05 1E-05 6E-05 3E-06 1E-05 3E-06 1E-05 3E-06 1E-05 4E-05 2E-04
9E-06 4E-05 9E-06 4E-05 2E-05 1E-04 5E-05 2E-04 9E-06 4E-05 9E-06 4E-05 9E-06 4E-05 1E-04 5E-04
5E-06 2E-05 5E-06 2E-05 1E-05 6E-05 3E-05 1E-04 5E-06 2E-05 5E-06 2E-05 5E-06 2E-05 7E-05 3E-04
TOTAL:3E-04 1E-03 3E-04 1E-03 7E-04 3E-03 1E-03 0.01 3E-04 1E-03 3E-04 1E-03 3E-04 1E-03 0.00 0.02
PRE-Controlled:3E-04 1E-03 3E-04 1E-03 7E-04 3E-03 1E-03 6E-03 3E-04 1E-03 3E-04 1E-03 3E-04 1E-03 0.00 0.02
Notes:1 - Assumed 8,760 hours per year of fugitive emissions.
20%
%Total %VOC
1,087.81 lb/MMscf 1,310.00 lb/MMscf 2.92% ---
kg/hr lb/hr/unit 39,864 lb/MMscf 42,750 lb/MMscf 95.21% ---
Valves 4.5E-03 9.92E-03 3,467 lb/MMscf 0 lb/MMscf --- ---
Pump Seals 2.4E-03 5.29E-03 459.24 lb/MMscf 560.00 lb/MMscf 1.25%100.00%
Others 8.8E-03 1.94E-02 44,878 lb/MMscf 44,900 lb/MMscf 100.00% ---
Connectors 2.0E-04 4.41E-04 ---lb/MMscf 2.00 lb/MMscf 0.004%0.36%
Flanges 3.9E-04 8.60E-04 ---lb/MMscf 2.00 lb/MMscf 0.004%0.36%
Open-Ended Lines 2.0E-03 4.41E-03 ---lb/MMscf 5.00 lb/MMscf 0.011%0.89%
Methanol ---lb/MMscf 10.00 lb/MMscf 0.022%1.79%
3 - "Other” components include pressure relief devices (PRD), compressors, diaphragms, drains, meters, etc. ---lb/MMscf 2.00 lb/MMscf 0.004%0.36%
4 - Component Count is based in GRI-HAPCalc default values for compressor stations, with a safety margin. ---lb/MMscf 2.00 lb/MMscf 0.004%0.36%
---lb/MMscf 2.00 lb/MMscf 0.004%0.36%
---lb/MMscf 25.00 lb/MMscf 0.06%4.46%
Methane (CH4)
Ethylbenzene Total HAP2,2,4-TMP
Worst Case
Minimum Contingency:
Toluene Xylenes
5 - The results of a representative Inlet Gas Analysis were used to determine the following
worst-case components (See Attachment C1 - Lab Analysis):
Pollutant Inlet Gas
Northwest Pipeline, LLC
Vernal Compressor Station
Potential to Emit Calculations
Process Piping and Equipment Leak (FUG) Emissions
Source
ID Description
LDAR
Control
Credit
Controlled
Leaks
VOC
CH4 GWP = 25
CH4CO2 CO2eLeak
FactorUnit
Count
Safety
Multiplier
Component
(Unit) Type
(Gas)
Benzene n-Hexane Methanol
FUG
Source
ID
Process Piping and
Equipment Leaks
(Gas)
(Gas)
Valves
Open-ended Lines
Component
(Unit) Type
Flanges
Pump Seals
Other
Connectors
Potential to Emit Calculations
Xylenes
VOC
N2/Water/Ethane/Etc
FUG
Valves
Pump Seals
Other
Connectors
Flanges
Open-ended Lines
GasEquipment Type
2 - Gas/Vapor emissions calculated using EPA Protocol for Equipment Leak Emission
Estimates, EPA-453/R-95-017, Nov 1995; Table 2-4, Oil and Gas Production Operations:
CO2
2,2,4-TMP
Vernal Compressor Station Process Piping and Equipment Leak (FUG) Emissions
Emission Estimates - Page 10 of 10
Total HAP
TOTAL Gas
Benzene
Ethylbenzene
n-Hexane
Toluene
2SLB 4SLB 4SRB Uncontrolled Water Injection Lean Pre-Mix#
lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu
NOx (≥ 90% Load)3.17E+00 4.08E+00 2.21E+00 3.23E-01 1.28E-01 9.91E-02
CO (≥ 90% Load)3.86E-01 3.17E-01 3.72E+00 8.23E-02 2.95E-02 1.51E-02
VOC (NMNEHC w/o Aldehydes*)4.93E-02 5.17E-02 3.68E-03 2.06E-03 2.06E-03 2.06E-03
VOC (NMNEHC w/ Aldehydes*)1.20E-01 1.18E-01 2.96E-02 2.82E-03 2.82E-03 2.13E-03
SO2 (2,000 gr-S/MMscf ≈ 0.0007 W%)5.88E-04 5.88E-04 5.88E-04 3.40E-03 3.40E-03 3.40E-03
PM10/2.5 (Total) 4.83E-02 9.99E-03 1.94E-02 6.63E-03 6.63E-03 6.63E-03
Acetaldehyde*7.76E-03 8.36E-03 2.79E-03 4.00E-05 4.00E-05 4.00E-05
Acrolein*7.78E-03 5.14E-03 2.63E-03 6.40E-06 6.40E-06 6.40E-06
Benzene 1.94E-03 4.40E-04 1.58E-03 1.20E-05 1.20E-05 9.10E-07
Butadiene, 1,3-8.20E-04 2.67E-04 6.63E-04 4.30E-07 4.30E-07 4.30E-07
Ethylbenzene 1.08E-04 3.97E-05 2.48E-05 3.20E-05 3.20E-05 3.20E-05
Formaldehyde (HCHO)*5.52E-02 5.28E-02 2.05E-02 7.10E-04 7.10E-04 2.00E-05
n-Hexane 4.45E-04 1.11E-03 --- --- --- ---
Methanol (MeOH)2.48E-03 2.50E-03 3.06E-03 --- --- ---
Polycyclic Organic Matter (POM/PAH)2.68E-04 3.74E-04 2.38E-04 3.47E-05 3.47E-05 3.47E-05
Toluene 9.63E-04 4.08E-04 5.58E-04 1.30E-04 1.30E-04 1.30E-04
Trimethylpentane, 2,2,4- (i-Octane)8.46E-04 2.50E-04 --- --- --- ---
Xylenes 2.68E-04 1.84E-04 1.95E-04 6.40E-05 6.40E-05 6.40E-05
Other/Trace HAP**6.57E-04 3.21E-04 1.79E-04 2.90E-05 2.90E-05 2.90E-05
TOTAL HAP 7.95E-02 7.22E-02 3.24E-02 1.06E-03 1.06E-03 3.57E-04
CO2 (GWP=1)1.10E+02 1.10E+02 1.10E+02 1.10E+02 1.10E+02 1.10E+02
CH4 (GWP=25)1.45E+00 1.25E+00 2.30E-01 8.64E-03 8.64E-03 8.64E-03
N2O (GWP=298) --- --- ---3.00E-03 3.00E-03 3.00E-03
CO2e --- --- --- --- --- ---
(#Lean Pre-Mix - aka: Dry Low Emissions (DLE or DLN) or SoLoNOx)
FLARE DIESEL ENGINES DIESEL EMGEN
13.5-1 06/17 3.3-1; 3.3-2 10/96 Tier 4 ≥ 751 bhp
Uncontrolled LoNOx Burners Flue Gas Recirc Combustion Uncontrolled Uncontrolled
lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu
NOx (≥ 90% Load)9.80E-02 4.90E-02 3.14E-02 Use Ext. Comb.4.41E+00 4.18E+00
CO (≥ 90% Load)8.24E-02 8.24E-02 8.24E-02 3.10E-01 9.50E-01 2.35E+00
VOC (NMNEHC w/o Aldehydes*)5.32E-03 5.32E-03 5.32E-03 3.60E-01 1.28E-01
VOC (NMNEHC w/ Aldehydes*)5.39E-03 5.39E-03 5.39E-03 3.62E-01 1.29E-01
SO2 (2,000 gr-S/MMscf ≈ 0.0007 W%)5.88E-04 5.88E-04 5.88E-04 2.90E-01 2.90E-01
PM10/2.5 (Total) 7.45E-03 7.45E-03 7.45E-03 3.10E-01 1.35E-01
Acetaldehyde* --- --- ---7.67E-04 2.72E-04
Acrolein* --- --- ---9.25E-05 3.28E-05
Benzene 2.06E-06 2.06E-06 2.06E-06 9.33E-04 3.31E-04
Butadiene, 1,3- --- --- ---3.91E-05 1.39E-05
Ethylbenzene --- --- --- --- ---
Formaldehyde (HCHO)*7.35E-05 7.35E-05 7.35E-05 1.18E-03 4.19E-04
n-Hexane 1.76E-03 1.76E-03 1.76E-03 --- ---
Methanol (MeOH) --- --- --- --- ---
Polycyclic Organic Matter (POM/PAH)1.69E-04 1.69E-04 1.69E-04 1.68E-04 5.97E-05
Toluene 3.33E-06 3.33E-06 3.33E-06 4.09E-04 1.45E-04
Trimethylpentane, 2,2,4- (i-Octane) --- --- --- --- ---
Xylenes --- --- ---2.85E-04 1.01E-04
Other/Trace HAP**1.18E-06 1.18E-06 1.18E-06 --- ---
TOTAL HAP 2.01E-03 2.01E-03 2.01E-03 3.87E-03 1.38E-03
CO2 (GWP=1)1.18E+02 1.18E+02 1.18E+02 1.64E+02 1.64E+02
CH4 (GWP=25)2.25E-03 2.25E-03 2.25E-03 --- ---
N2O (GWP=298)2.16E-03 6.27E-04 6.27E-04 --- ---
CO2e --- --- --- --- ---
Weighted Sum
Carbon Dioxide Methane Nitrous Oxide CO2e
lb CO2/MMBtu lb CH4/MMBtu lb N2O/MMBtu lb CO2e/MMBtu
Fuel Oil No. 2 (Diesel)138,000 Btu/gal 1.63E+02 6.61E-03 1.32E-03 1.64E+02
Propane 91,000 Btu/gal 1.39E+02 6.61E-03 1.32E-03 1.39E+02
Natural Gas 1,026 Btu/scf 1.17E+02 2.20E-03 2.20E-04 1.17E+02
CO2 CH4 N2O
1 25 298
Revised: 10/18/18
Default HHV
Table C-1 to Subpart C of Part 98 Table C-2 to Subpart C of Part 98
Emission Factors
Table A-1 to Subpart A of Part 98
GH
G
** Other/Trace HAPs include: Carbon Tetrachloride, Chlorobenzene, Chloroform,
Dichloropropene, ,3-Dichloropropene, Ethylene Dibromide, Methylene Chloride,
Naphthalene, PAH, Phenol, Propylene, Oxide, Styrene, 1,1,2,2-Tetrachloroethane,
1,1,2-Trichloroethane, and Vinyl Chloride (as per AP-42).
GH
G
GAS-FIRED EXTERNAL COMBUSTION
Fuel Type
40 CFR 98 - DEFAULT EMISSION FACTORS
* Aldehyde (not measured in EPA Test Method 25)Global Warming Potential (100 Yr) (GWP)
CR
I
T
E
R
I
A
HA
P
s
HA
P
s
Pollutant
CR
I
T
E
R
I
A
AP-42 Table 1.4-1; 1.4-2; 1.4-3 (<100 MMBtu/hr) 07/98
Use Ext. Comb.
Potentially Applicable
AP-42 and GHG EMISSION FACTORS
(Preferentially use test data or vendor data where available)
Pollutant
GAS-FIRED ENGINES GAS-FIRED TURBINES
AP-42 Table 3.2-1; 3.2-2; 3.2-3 07/00 AP-42 Table 3.1-1; 3.1-2a; 3.1-3 04/00
Use Ext. Comb.
Use Ext. Comb.
Sampled:NWP Kemmerer CS GPSA-Sec 23
Water 109-86-4 H2O 18.015 --- --- --- --- --- --- --- --- ---
Carbon Dioxide 124-38-9 CO2 44.010 1 0.9380 0.4128 1,087.81 2.4240 --- --- --- ---
Hydrogen Sulfide 2148-87-8 H2S 34.086 2 --- --- --- --- --- ---637.6 ---
Nitrogen 7727-37-9 N2 28.013 3 0.4650 0.1303 343.26 0.7649 --- --- --- ---
Methane*75-82-8 CH4 16.042 4 94.2980 15.1276 39,863.73 88.8278 91.7537 ---1,010.0 952.410
Ethane*74-84-0 C2H6 30.069 5 3.9420 1.1853 3,123.49 6.9600 7.1893 ---1,769.7 69.762
Propane**74-98-6 C3H8 44.096 6 0.2710 0.1195 314.90 0.7017 0.7248 68.5699 2,516.2 6.819
iso-Butane**75-28-5 i-C4H10 58.122 7 0.0320 0.0186 49.01 0.1092 0.1128 10.6724 3,252.0 1.041
n-Butane**106-97-8 n-C4H10 58.122 8 0.0330 0.0192 50.54 0.1126 0.1163 11.0059 3,262.4 1.077
iso-Pentane**78-78-4 i-C5H12 72.149 9 0.0080 0.0058 15.21 0.0339 0.0350 3.3120 4,000.9 0.320
n-Pentane**109-66-0 n-C5H12 72.149 10 0.0060 0.0043 11.41 0.0254 0.0263 2.4840 4,008.9 0.241
Cyclopentane**287-92-3 C5H10 70.100 11 --- --- --- --- --- ---3,763.6 ---
Cyclohexane**110-82-7 C6H12 84.162 13 --- --- --- --- --- ---4,481.6 ---
Other Hexanes**Various C6H14 86.175 14 0.0080 0.0069 18.17 0.0405 0.0418 3.9559 4,750.3 0.380
Methylcyclohexane**108-87-2 C7H14 98.186 16 --- --- --- --- --- ---5,215.9 ---
C8+ Heavies**Various C8+138.00 est.22 --- --- --- --- --- ---7,000.0 ---
Benzene***71-43-2 C6H6 78.112 18 --- --- --- --- --- ---3,741.9 ---
Ethylbenzene***100-41-4 C8H10 106.165 20 --- --- --- --- --- ---5,222.0 ---
n-Hexane***110-54-3 C6H14 86.175 12 --- --- --- --- --- ---4,756.0 ---
Methanol***67-56-1 CH3OH 32.040 --- --- --- --- --- --- ---866.9 ---
Toluene***108-88-3 C7H8 92.138 19 --- --- --- --- --- ---4,474.9 ---
2,2,4-Trimethylpentane***540-84-1 C8H18 114.229 17 --- --- --- --- --- ---6,213.6 ---
Xylenes***1330-20-7 C8H10 106.165 21 --- --- --- --- --- ---5,208.7 ---
100.001 17.0302 44,877.53 100.00 --- ---1,032
98.598 16.4871 43,446.46 96.81 100.00 ---
0.358 0.1743 459.24 1.02 1.06 100.00
--- --- --- --- --- ---
20%
Mole %Wgt %lb/MMscf Wgt %lb/MMscf % VOC
0.9380 2.424 1,087.81 2.92%1,310.00 --- ---Margin
94.2980 88.828 39,864 95.21%42,750 --- ---Margin
4.4070 7.725 3,467 0.00%0 --- ---Margin
0.3580 1.023 459.24 1.25%560.00 100.00%21.9%Margin
100.0010 100.000 44,878 100.00%44,900 ---0.1%Margin
--- --- ---0.004%2.00 0.36% ---Margin
--- --- ---0.004%2.00 0.36% ---Margin
--- --- ---0.011%5.00 0.89% ---Margin
--- --- ---0.022%10.00 1.79% ---Margin
--- --- ---0.004%2.00 0.36% ---Margin
* = Hydrocarbon (HC) --- --- ---0.004%2.00 0.36% ---Margin
** = also Volatile Organic Compound (VOC) --- --- ---0.004%2.00 0.36% ---Margin
*** = also Hazardous Air Pollutant (HAP) --- --- ---0.06%25.00 4.46% ---Margin
Calculated
Btu/scf
(HHV):
Xylenes***
2,2,4-Trimethylpentane***
Toluene***
n-Hexane***
Methanol***
Minimum VOC/HAP Margin:Margin for Changes
in Future Gas Composition
Representative Inlet Gas Analysis Assumed "Worst-Case"
Component
Northwest Pipeline, LLC
Vernal Compressor Station
Potential to Emit Calculations
Inlet Gas - Summary
Component CAS Formula Molecular
Weight (MW)
Mole %
(M% = V%)
Wgt Sum
(MW*MF)
lb/MMscf
(WS/UGC#)
Weight %
Total
Gas
Btu/scf (HHV)
Weight %
THC
Weight %
VOC
Component
Btu/scf (HHV)
Total HAP***
GRI
#
Total HAP:
THC:
Totals:
Total VOC:lb "X"/scf =
(M% of "X") x (MW of "X") / #UGC
#UGC (Universal Gas Constant)
= 379.482 scf/lb-mol @ 60 oF and 14.6959 psia.
9/2022-9/2023 Avg.
CO2
Other (N2, C2, O2, CO, H2O)
Gas Analysis
Inlet Gas - Summary
Methane*
TOTAL GAS
VOC**
Methanol emissions determined to be 0.8 tpd
for 6-mo/yr from each 120 MMscd Dehydrator.
MeOH = 0.8 * 2000 / 125=12.80 lb/MMscf
Vernal Compressor Station Potential to Emit Calculations
Ethylbenzene***
Benzene***
MAXIMUM DESIGN HEAT INPUT (MDHI) AND MAXIMUM HOURS OF OPERATION
Current Proposed Change Current Proposed Change
1E TXP1 Heat Medium Heater 17.40 26.26 8.86 8,760 8,760 ---
2E TXP1 Regen Gas Heater 5.605 9.40 3.80 3,000 8,760 5,760
3E TXP2 Regen Gas Heater 12.42 20.30 7.88 2,500 8,760 6,260
#REF!TXP3 Regen Gas Heater 12.42 20.30 7.88 2,500 8,760 6,260
#REF!De-Ethanizer Hot Oil Heater 63 68.33 5.33 8,760 8,760 ---
#REF!De-Ethanizer Hot Oil Heater 63 68.33 5.33 8,760 8,760 ---
#REF!De-Ethanizer Regen Gas Heater 10.19 10.44 0.25 4,015 8,760 4,745
#REF!Process Flare 8.83 26.82 17.98 8,760 8,760 ---
#REF!Standby Generator 1.76 2.15 0.38 500 500 ---
#REF!184.04 223.36 39.32 38,295 61,320 23,025
#REF!
#REF!
#REF!Current Proposed Change Current Proposed Change
#REF!TXP1 Heat Medium Heater 19,227 26,437 7,211 168.43 231.59 63.16
#REF!TXP1 Regen Gas Heater 6,194 9,462 3,269 18.58 82.89 64.31
#REF!TXP2 Regen Gas Heater 13,724 20,435 6,711 34.31 179.01 144.70
#REF!TXP3 Regen Gas Heater 13,724 20,435 6,711 34.31 179.01 144.70
#REF!De-Ethanizer Hot Oil Heater 69,614 68,780 (833)609.82 602.52 ---
#REF!De-Ethanizer Hot Oil Heater 69,614 68,780 (833)609.82 602.52 ---
#REF!De-Ethanizer Regen Gas Heater 11,263 10,511 (751)45.22 92.08 46.86
203,360 224,841 21,485 1,520.49 1,969.61 463.72
1E - TXP1 Hot Oil Heater - MAXIMUM EMISSIONS (Improved Emission Factors)
Current Proposed Change Current Proposed Change
0.85 2.57 1.72 3.73 11.28 7.55
1.43 2.16 0.73 6.25 9.47 3.22
0.09 0.15 0.06 0.41 0.64 0.23
2,038 3,225 1,187 8,925 14,125 5,200
2E - TXP1 Regen Gas Heater - MAXIMUM EMISSIONS (Improved Emission Factors, Increased Hr/Yr)
Current Proposed Change Current Proposed Change
0.27 0.92 0.65 0.41 4.04 3.63
0.46 0.77 0.31 0.69 3.39 2.70
0.03 0.05 0.02 0.05 0.23 0.18
657 1,154 497 985 5,056 4,071
3E+4E - TXP2+TXP3 Regen Gas Heaters - MAXIMUM EMISSIONS (Improved Emission Factors, Increased MDHI, Increased Hr/Yr)
Current Proposed Change Current Proposed Change
0.61 0.73 0.12 0.76 3.20 2.44
1.02 0.81 (0.21)1.27 3.56 2.29
0.07 0.39 0.32 0.08 1.69 1.61
1,455 2,380 925 1,818 10,422 8,604
Volatile Organic Compounds (VOC)
Carbon Dioxide Equivalent (CO2e)
Pollutant Maximum Hourly Emissions (lb/hr)Maximum Annual Emissions (tpy)
Nitrogen Oxides (NOx)
Carbon Monoxide (CO)
Maximum Annual Emissions (tpy)
Nitrogen Oxides (NOx)
Carbon Monoxide (CO)
Volatile Organic Compounds (VOC)
Carbon Dioxide Equivalent (CO2e)
Carbon Monoxide (CO)
Volatile Organic Compounds (VOC)
Carbon Dioxide Equivalent (CO2e)
Pollutant Maximum Hourly Emissions (lb/hr)
SOURCE-SPECIFIC REQUIREMENTS -- HEATERS (1E THRU 7E)
Emission
Point ID Name MDHI MMBtu/hr (ave)Maximum hr/yr
Name Maximum scf/hr Maximum MMscf/yr
Pollutant Maximum Hourly Emissions (lb/hr)Maximum Annual Emissions (tpy)
Nitrogen Oxides (NOx)
5E+6E - De-Ethanizer Hot Oil Heaters - MAXIMUM EMISSIONS (Improved Emission Factors, Increased MDHI)
Current Proposed Change Current Proposed Change
3.09 2.46 (0.63)13.52 10.77 (2.75)
5.17 2.53 (2.64)22.63 11.07 (11.56)
0.34 0.38 0.04 1.49 1.67 0.18
7,371 8,390 1,019 32,285 36,749 4,464
7E - De-Ethanizer Regen Gas Heater - MAXIMUM EMISSIONS (Improved Emission Factors, Increased MDHI, Increased Hr/Yr)
Current Proposed Change Current Proposed Change
0.50 1.02 0.52 1.00 4.48 3.48
0.84 0.86 0.02 1.68 3.77 2.09
0.06 0.06 (0.00)0.11 0.25 0.14
1,194 1,282 88 2,397 5,616 3,219
8E - Process Flare - MAXIMUM EMISSIONS (Improved Emission Factors, Increased MDHI, Increased Hr/Yr)
Current Proposed Change Current Proposed Change
0.50 1.02 0.52 1.00 4.48 3.48
0.84 0.86 0.02 1.68 3.77 2.09
0.06 0.06 (0.00)0.11 0.25 0.14
1,194 1,282 88 2,397 5,616 3,219
TOTAL HEATERS
Current Proposed Change Current Proposed Change
9.02 10.90 1.88 33.70 47.75 14.05
15.11 10.48 (4.63)56.42 45.89 (10.53)
1.00 1.79 0.79 3.71 7.83 4.12
21,541 27,201 5,660 80,513 119,139 38,626
Caron Monoxide (CO)
Volatile Organic Compounds (VOC)
Carbon Dioxide Equivalent (CO2e)
Maximum Hourly Emissions (lb/hr)Maximum Annual Emissions (tpy)
Nitrogen Oxides (NOx)
Carbon Monoxide (CO)
Nitrogen Oxides (NOx)
Nitrogen Oxides (NOx)
Carbon Monoxide (CO)
Volatile Organic Compounds (VOC)
Carbon Dioxide Equivalent (CO2e)
Pollutant
Pollutant Maximum Hourly Emissions (lb/hr)Maximum Annual Emissions (tpy)
Pollutant Maximum Hourly Emissions (lb/hr)Maximum Annual Emissions (tpy)
Nitrogen Oxides (NOx)
Carbon Monoxide (CO)
Volatile Organic Compounds (VOC)
Carbon Dioxide Equivalent (CO2e)
Volatile Organic Compounds (VOC)
Carbon Dioxide Equivalent (CO2e)
Pollutant Maximum Hourly Emissions (lb/hr)Maximum Annual Emissions (tpy)
903 Btu/scf (LHV)
993 Btu/scf (HHV)
26,437 scfh TRUE
9,462 scfh TRUE
20,435 scfh TRUE
20,435 scfh TRUE
68,780 scfh TRUE
68,780 scfh TRUE
10,511 scfh TRUE
231.59 MMscfy TRUE
82.89 MMscfy TRUE
179.01 MMscfy TRUE
179.01 MMscfy TRUE
602.52 MMscfy TRUE
602.52 MMscfy TRUE
92.08 MMscfy TRUE
1,969.61 MMscfy TRUE
11.28 tpy TRUE
9.47 tpy TRUE
0.64 tpy TRUE
14,125 tpy TRUE
4.04 tpy TRUE
3.39 tpy TRUE
0.23 tpy TRUE
5,056 tpy TRUE
3.20 tpy TRUE
3.56 tpy TRUE
1.69 tpy TRUE
10,422 tpy TRUE
CHECK!!
10.77 tpy TRUE
11.07 tpy TRUE
1.67 tpy TRUE
36,749 tpy TRUE
4.48 tpy TRUE
3.77 tpy TRUE
0.25 tpy TRUE
5,616 tpy TRUE
4.48 tpy TRUE
3.77 tpy TRUE
0.25 tpy TRUE
5,616 tpy TRUE
47.75 tpy TRUE
45.89 tpy TRUE
34.81 tpy FALSE
119,139 tpy TRUE
lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 7.11 31.14 8.66 37.92 2.48 10.86 1.08 4.73 0.51 2.24
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 100 2.81 0.14 5.62 0.28 1.53 0.08 7E-02 4E-03 0.10 0.00
Exist HTR-01 na Line Heater 0.50 MMBtu/hr 8,760 0.05 0.21 0.04 0.18 3E-03 0.01 3E-04 1E-03 4E-03 0.02
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- --- ---2E-03 0.01 --- --- --- ---
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- --- ---0.03 0.14 --- --- --- ---
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- --- ---2E-03 0.01 --- --- --- ---
9.97 31.50 14.32 38.38 4.05 11.11 1.15 4.73 0.61 2.26
100 100 100 100 100
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 ------------0.08 0.36 ------------
--- --- --- ---0.08 0.36 --- --- --- ---
9.97 31.50 14.32 38.38 4.14 11.47 1.15 4.73 0.61 2.26
na na na na na
* = lb/hr is based on 8,760 hr/yr.
!! Line 50 !! (@75%)
Description Site Rating
Point Sources:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
Fugitive Sources:
Vernal Compressor Station - Grand Total
Vernal Compressor Station - Point Sources
Grand Total:
TVOP Threshold:
Vernal Compressor Station Criteria Pollutants - Controlled Potential to Emit CalculationsEmission Estimates - Page 01 of 10
PM10/2.5
N
Vernal Compressor Station
Potential to Emit Calculations
Criteria Pollutants - Controlled
Status Source
ID APCE hr/yr*NOx CO VOC (w/HCHO)SO2
lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 3E-03 0.01 5E-04 2E-03 7E-05 3E-04 3E-05 1E-04 2E-03 1E-02 0.20 0.89 --- ---
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 100 1E-02 7E-04 1E-02 7E-04 0.01 4E-04 3E-03 2E-04 1E-04 6E-06 0.10 0.01 --- --
Exist HTR-01 na Line Heater 0.5 MMBtu/hr 8,760 --- --- --- ---1E-06 5E-06 --- --- --- ---4E-05 2E-04 9E-04 4E-03
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- --- ---8E-06 4E-05 --- ---8E-06 4E-05 --- ---2E-05 9E-05
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- --- ---1E-04 5E-04 --- ---1E-04 5E-04 --- ---3E-04 1E-03
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- --- ---8E-06 4E-05 --- ---8E-06 4E-05 --- ---2E-05 9E-05
0.02 0.01 0.01 3E-03 0.01 1E-03 3E-03 3E-04 3E-03 0.01 0.31 0.90 1E-03 5E-03
na na na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 --- --- --- ---3E-04 1E-03 --- ---3E-04 1E-03 --- ---7E-04 3E-03
--- --- --- ---3E-04 1E-03 --- ---3E-04 1E-03 --- ---7E-04 3E-03
0.02 0.01 0.01 3E-03 0.01 3E-03 3E-03 3E-04 3E-03 0.01 0.31 0.90 2E-03 0.01
10 10 10 10 10 10 10
* = lb/hr is based on 8,760 hr/yr.
!! Line 50 !! (@75%)
Description Site Rating
Point Sources:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
Fugitive Sources:
Vernal Compressor Station - Grand Total
Vernal Compressor Station - Point Sources
Grand Total:
TVOP Threshold:
Vernal Compressor Station Hazardous Air Pollutants (HAP) - Controlled - Part 01 of 02 Potential to Emit CalculationsEmission Estimates - Page 02 of 10
Ethylbenzene HCHO n-Hexane
N
Vernal Compressor Station
Potential to Emit Calculations
Hazardous Air Pollutants (HAP) - Controlled - Part 01 of 02
Status Source
ID APCE hr/yr*Acetaldehyde Acrolein Benzene Butadiene
lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 --- ---3E-03 0.01 1E-02 0.04 --- ---5E-03 0.02 2E-03 1E-02 0.23 1.01 0E+00
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 100 0.02 8E-04 1E-03 6E-05 3E-03 1E-04 3E-03 2E-04 1E-03 5E-05 9E-04 5E-05 0.17 0.01 0E+00
Exist HTR-01 na Line Heater 0.5 MMBtu/hr 8,760 --- ---8E-05 4E-04 2E-06 7E-06 --- --- --- ---6E-07 3E-06 1E-03 4E-03 0E+00
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 4E-05 2E-04 ------8E-06 4E-05 8E-06 4E-05 8E-06 4E-05 ------1E-04 4E-04 0E+00
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 6E-04 3E-03 ------1E-04 5E-04 1E-04 5E-04 1E-04 5E-04 ------1E-03 6E-03 0E+00
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 4E-05 2E-04 ------8E-06 4E-05 8E-06 4E-05 8E-06 4E-05 ------1E-04 4E-04 0E+00
0.02 4E-03 4E-03 0.01 0.01 0.04 3E-03 7E-04 0.01 0.02 3E-03 0.01 0.40 1.03
na na na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 1E-03 0.01 --- ---3E-04 1E-03 3E-04 1E-03 3E-04 1E-03 --- ---4E-03 0.02
1E-03 0.01 --- ---3E-04 1E-03 3E-04 1E-03 3E-04 1E-03 --- ---4E-03 0.02
0.02 0.01 4E-03 0.01 0.01 0.05 4E-03 2E-03 0.01 0.02 3E-03 0.01 0.40 1.04
10 10 10 10 10 10 25
* = lb/hr is based on 8,760 hr/yr.
10000
6%
600.00
!! Line 50 !! (@75%)
Description Site Rating
Point Sources:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
Fugitive Sources:
Vernal Compressor Station - Grand Total
Vernal Compressor Station - Point Sources
Grand Total:
TVOP Threshold:
Vernal Compressor Station Hazardous Air Pollutants (HAP) - Controlled - Part 02 of 02 Potential to Emit CalculationsEmission Estimates - Page 03 of 10
Xylenes Trace/Other HAP Total HAP
N
Vernal Compressor Station
Potential to Emit Calculations
Hazardous Air Pollutants (HAP) - Controlled - Part 02 of 02
Status Source
ID APCE hr/yr*Methanol POM/PAH Toluene 2,2,4-TMP
CO2 CO2e CH4 CO2e N2O CO2e
GW P:1 GW P:25 GW P:298
MMBtu/hr tpy tpy tpy tpy tpy tpy lb/hr*tpy Check
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 0.00 37,148 37,148 11.82 295.50 1.01 301.91 8,618 37,746 0E+00
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 100 5.03 27.69 27.69 0.06 1.45 6E-05 0.02 583 29.16 0E+00
Exist HTR-01 na Line Heater 0.50 MMBtu/hr 8,760 0.50 258 258 5E-03 0.12 5E-03 1.41 59 259 0E+00
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- ------ --- --- --- ------0E+00
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- ------ --- --- --- ------0E+00
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- ------ --- --- --- ------0E+00
5.53 37,434 37,434 12 297 1.02 303.34 9,260 38,034
na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 ---0.01 0.01 27.76 694 --- ---158.47 694
---0.01 0.01 27.76 694 --- ---158.47 694
5.53 37,434 37,434 40 991 1.02 303.34 9,418 38,728
na na na na na
* = lb/hr is based on 8,760 hr/yr.
!! Line 50 !! (@75%)
Description Site Rating
Point Sources:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
Fugitive Sources:
Vernal Compressor Station - Grand Total
Grand Total:
TVOP Threshold:
Vernal Compressor Station Greenhouse Gas (GHG) Pollutants - Controlled Potential to Emit CalculationsEmission Estimates - Page 04 of 10
hr/yr*
Heat Input
(HHV)
TOTAL
CO2e
Vernal Compressor Station - Point Sources
N
Vernal Compressor Station
Potential to Emit Calculations
Greenhouse Gas (GHG) Pollutants - Controlled
Status Source
ID APCE
lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy lb/hr*tpy
Exist CT-01 na Compressor Turbine 01 - Solar Taurus 70-10302S 9,755 bhp (0oF)8,760 7.11 31.14 8.66 37.92 2.48 10.86 0.20 0.89 0.23 1.01 8,618 37,746
Exist GE-01 na Generator Engine 01 - Caterpillar G3412 637 bhp 100 ------------------0.10 0.03 0.17 0.04 583 146
Exist HTR-01 na Line Heater 0.5 MMBtu/hr 8,760 0.05 0.21 0.04 0.18 3E-03 0.01 4E-05 2E-04 1E-03 4E-03 59 259
Exist TK-01 na Storage Tank 01 - Lube Oil 6 bbl 8,760 --- --- --- ---2E-03 0.01 --- ---1E-04 4E-04 ------
Exist TK-02 na Storage Tank 02 - Condensate 70 bbl 8,760 --- --- --- ---0.03 0.14 --- ---1E-03 0.01 ------
Exist TK-03 na Storage Tank 03 - Lubricating Oil 2 bbl 8,760 --- --- --- ---2E-03 0.01 --- ---1E-04 4E-04 ------
7.16 31.35 8.70 38.10 2.52 11.03 0.31 0.92 0.40 1.06 9,260 38,151
na na na na na na
Exist FUG na Process Piping & Equipment Leaks 988 Units 8,760 ------------0.08 0.36 --- ---4E-03 0.02 158.66 694
--- --- --- ---0.08 0.36 --- ---4E-03 0.02 159 694
7.16 31.35 8.70 38.10 2.60 11.40 0.31 0.92 0.40 1.08 9,419 38,845
* = lb/hr is based on 8,760 hr/yr.
N
Vernal Compressor Station
Potential to Emit Calculations
Pre-Controlled Emissions Summary
Status Source
ID APCE
Vernal Compressor Station Pre-Controlled Emissions Summary
Emission Estimates - Page 05 of 10
!! Line 50 !! (@75%)
CO VOC (w/HCHO)HCHO Total HAP
Potential to Emit Calculations
CO2e
Vernal Compressor Station - Point Sources
Fugitive Sources:
Vernal Compressor Station - Grand Total
Grand Total:
hr/yr*NOxDescriptionSite Rating
Point Sources:
TVOP Threshold:
Vernal Compressor Station - Fugitive Sources
lb/MMBtu (0oF)lb/hr (0oF)tpy (0oF)lb/hr (0oF)tpy (0oF)
Vendor Data NOx (25 ppm)0.100 7.11 31.14 ---7.11 31.14
Vendor Data CO (50 ppm)0.122 8.66 37.92 ---8.66 37.92
Vendor Data UHC (CH4) (25 ppm)0.035 2.48 10.86 ---2.48 10.86
Vendor Data (PIL 168)VOC (UHC*100%)0.035 2.48 10.86 ---2.48 10.86
9,755 bhp (Max @ 0oF)Tariff Specification SO2 0.014 1.08 4.73 ---1.08 4.73
8,474 bhp (Avg @ 40oF)AP-42 Table 3.1-2b PM10/2.5 0.007 0.51 2.24 ---0.51 2.24
8,760 hr/yr AP-42 Table 3.1-3 Acetaldehyde 4.00E-05 3E-03 0.01 ---3E-03 0.01
AP-42 Table 3.1-3 Acrolein 6.40E-06 5E-04 2E-03 ---5E-04 2E-03
AP-42 Table 3.1-3 Benzene 9.10E-07 7E-05 3E-04 ---7E-05 3E-04
AP-42 Table 3.1-3 Butadiene, 1,3-4.30E-07 3E-05 1E-04 ---3E-05 1E-04
AP-42 Table 3.1-3 Ethylbenzene 3.20E-05 2E-03 0.01 ---2E-03 0.01
Vendor Data (PIL 168)Formaldehyde 2.65E-03 0.20 0.89 ---0.20 0.89
AP-42 Table 3.1-3 n-Hexane --- --- --- --- --- ---
AP-42 Table 3.1-3 Methanol --- --- --- --- --- ---
AP-42 Table 3.1-3 POM/PAH 3.47E-05 3E-03 0.01 ---3E-03 0.01
AP-42 Table 3.1-3 Toluene 1.30E-04 1E-02 0.04 ---1E-02 0.04
8,084 Btu/bhp-hr (HHV)AP-42 Table 3.1-3 TMP, 2,2,4- --- --- --- --- --- ---
77.10 MMBtu/hr (Max @ 0oF)AP-42 Table 3.1-3 Xylenes 6.40E-05 5E-03 0.02 ---5E-03 0.02
AP-42 Table 3.1-3 Other/Trace HAP 2.90E-05 2E-03 0.01 ---2E-03 0.01
75,591 scf/hr (Max @ 0oF)Sum Total HAP 2.98E-03 0.23 1.01 ---0.23 1.01
AP-42 Table 3.1-3 CO2 (GWP=1)110 8,481 37,148 ---8,481 37,148
662 MMscf/yr Vendor Data CH4 (GWP=25)0.035 2.70 11.82 ---2.70 11.82
1,020 Btu/scf (HHV)AP-42 Table 3.1-3 N2O (GWP=298)0.003 0.23 1.01 ---0.23 1.01
Weighted Sum CO2e 112 8,618 37,746 ---8,618 37,746
Notes:1 - The emissions shown are based on operation at 100% of rated load for 8,760 hr/yr.
2 - PM10/2.5 is filterable and condensable particulate matter; including PM10 and PM2.5
5. SO2 emissions based maximum total sulfur content in natural gas tarriff limit of 5 grains/100 scf
and assumption that all sulfur in the fuel is converted to SO2. See below.
SO2 EF (lb/MMscf) = (5 gr S/100 scf) x (lb/7000 gr) x (lb-mol/16 lb S) x (32 lb SO2/lb-mol) x (1,000,000 scf/MMscf)
= 14.28 lb/MMscf
Calculation Example for Solar Centaur 40 SO² Emissions:
4.73 tons SO2
year
3 - "Other/Trace HAPs" includes: Carbon Tetrachloride, Chlorobenzene, Chloroform, Dichloropropene, 1,3-Dichloropropene, Ethylene Dibromide, Methylene
Chloride, Phenol, Propylene Oxide, Styrene, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, and Vinyl Chloride (as per AP-42).
4 - The fuel heating value will vary, 1,020 Btu/scf (HHV) is at the low end of the range and results in a high (conservative) fuel consumption estimate. (It does
NOT impact the emission estimates.)
14.28 lbs SO2 662 MMSCF
MMSCF year
Vernal Compressor Station Compressor Turbine (CT-01) Emissions Potential to Emit Calculations
Emission Estimates - Page 06 of 10
#REF!
CT-01
Compressor Turbine 01
Solar Taurus 70-10302S
Manufactured ≥ 02/18/05
NSPS KKKK Affected
Control
Efficiency
Controlled
Emissions
N
Vernal Compressor Station
Potential to Emit Calculations
Compressor Turbine (CT-01) Emissions
Source
ID Description Reference Pollutant
Controlled
Emissions