November 17, 2009 

Tracy Carter, General Manager 

Devon Energy Production Company, L.P. 

Blaine County #1 Compressor Station 

20 N. Broadway 

Oklahoma City, OK 73102 

RE: Final Title V Operating Permit #OP1626-07 

Dear Mr. Carter: 

The Department of Environmental Quality has prepared the enclosed Final Operating Permit #OP1626-

07, for Devon’s Blaine County #1 Compressor Station located in the NW1⁄4 of Section 29, Township 31 

North, Range 18 East in Blaine County, Montana. Please review the cover page of the attached permit for 

information pertaining to the action taking place on Operating Permit #OP1626-07. 

If you have any questions, please contact Kathleen Doran, the permit writer, at (406) 247-4443 or by 

email at kdoran@mt.gov. 

Sincerely, 

Vickie Walsh Kathleen Doran, P.E. 

Air Permitting Program Supervisor Environmental Engineer 

Air Resources Management Bureau Air Resources Management Bureau 

(406) 444-3490 (406) 247-4443 

VW:KD 

Enclosure 

Cc: Christopher Ajayi, US EPA Region VIII 8P-AR 

 Betsy Burns, US EPA Region VIII, Montana Office 

 Garry Visser, Devon, P.O. Box 2606, Havre, MT 
STATE OF MONTANA 

Department of Environmental Quality 

Helena, Montana 59620 

AIR QUALITY OPERATING PERMIT NUMBER OP1626-07 

Issued to: Devon Energy Production Company, L.P. 

Blaine County #1 Compressor Station 

NW1⁄4 of Section 29, Township 31 North, Range 18 East 

Blaine County 

P.O. Box 2606 

Havre, MT 59501 

Final Date: November 17, 2009

Expiration Date: March 29, 2014

Effective Date: November 17, 2009 

Date of Decision: October 16, 2009 

End of EPA 45-day Review: October 13, 2009 

Proposed Issue Date: August 27, 2009 

Draft Issue Date: July 8, 2009

Application Deemed Technically Complete: February 13, 2009 

Application Deemed Administratively Complete: February 3, 2009 

Significant Modification Application Received: January 28, 2009 

Application Deemed Technically Complete: December 17, 2008

Application Deemed Administratively Complete: September 26, 2008

Operating Permit Renewal Application Received: September 26, 2008

AFS Number: 030-005-0001A 

Permit Issuance and Appeal Process: In accordance with the Montana Code Annotated (MCA) 

sections 75-2-217 and 218, and the Administrative Rules of Montana (ARM) Title 17, Chapter 8, 

Subchapter 12, Operating Permit Program, this operating permit is hereby issued by the Department of 

Environmental Quality (Department) as effective and final on November 17, 2009. This permit must be 

kept on-site at the above named facility. 

OP1626-07 i Date of Decision: 10/16/09 

Effective Date: 11/17/09 
OP1626-07 ii Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Montana Air Quality Operating Permit 

Department of Environmental Quality 

SECTION I. GENERAL INFORMATION..........................................................................................1

SECTION II. SUMMARY OF EMISSION UNITS ..............................................................................2

SECTION III. PERMIT CONDITIONS..................................................................................................3

A. FACILITY-WIDE ....................................................................................................................3 

B. EU001 AND EU002: 5,500-BHP INGERSOLL RAND KVR 616 COMPRESSOR ENGINES........7 

C. EU003, EU004, AND EU005: 1,140-BHP CATERPILLAR G3516 TALE COMPRESSOR 

 ENGINES................................................................................................................................9 

D. EU006: 60 MMSCFD (DRY GAS) ALCO DEHYDRATION UNIT AND 50 MMSCFD (DRY GAS)

 PAMCO DEHYDRATION UNIT............................................................................................13 

E. EU007: 297 BHP WAUKESHA L1616 EMERGENCY ENGINE/GENERATOR, AND .................14 

 EU008: 770 BHP CUMMINS GTA28 EMERGENCY ENGINE/GENERATOR ...........................14 

SECTION IV. NON-APPLICABLE REQUIREMENTS.....................................................................16

A. FACILITY-WIDE ..................................................................................................................16 

B. EMISSIONS UNIT .................................................................................................................17 

SECTION V. GENERAL PERMIT CONDITIONS ...........................................................................18

A. COMPLIANCE REQUIREMENTS............................................................................................18 

B. CERTIFICATION REQUIREMENTS ........................................................................................18 

C. PERMIT SHIELD...................................................................................................................19 

D. MONITORING, RECORDKEEPING, AND REPORTING REQUIREMENTS..................................20 

E. PROMPT DEVIATION REPORTING........................................................................................21 

F. EMERGENCY PROVISIONS...................................................................................................21 

G. INSPECTION AND ENTRY.....................................................................................................22 

H. FEE PAYMENT.....................................................................................................................22 

I. MINOR PERMIT MODIFICATIONS ........................................................................................23 

J. CHANGES NOT REQUIRING PERMIT REVISION ...................................................................23 

K. SIGNIFICANT PERMIT MODIFICATIONS...............................................................................24 

L. REOPENING FOR CAUSE......................................................................................................24 

M. PERMIT EXPIRATION AND RENEWAL..................................................................................25 

N. SEVERABILITY CLAUSE ......................................................................................................25 

O. TRANSFER OR ASSIGNMENT OF OWNERSHIP......................................................................26 

P. EMISSIONS TRADING, MARKETABLE PERMITS, ECONOMIC INCENTIVES...........................26 

Q. NO PROPERTY RIGHTS CONVEYED.....................................................................................26 

R. TESTING REQUIREMENTS....................................................................................................26 

S. SOURCE TESTING PROTOCOL .............................................................................................26 

T. MALFUNCTIONS..................................................................................................................26 

U. CIRCUMVENTION ................................................................................................................26 

V. MOTOR VEHICLES ..............................................................................................................26 

W. ANNUAL EMISSIONS INVENTORY .......................................................................................27 

X. OPEN BURNING...................................................................................................................27 

Y. MONTANA AIR QUALITY PERMITS.....................................................................................27 

Z. NATIONAL EMISSION STANDARD FOR ASBESTOS ..............................................................28 

AA. ASBESTOS ...........................................................................................................................28 

BB. STRATOSPHERIC OZONE PROTECTION – SERVICING OF MOTOR VEHICLE AIR 

 CONDITIONERS ...................................................................................................................28 

CC. STRATOSPHERIC OZONE PROTECTION – RECYCLING AND EMISSION REDUCTIONS ..........28 

DD. EMERGENCY EPISODE PLAN...............................................................................................29 

EE. DEFINITIONS .......................................................................................................................29 
OP1626-07 iii Date of Decision: 10/16/09 

Effective Date: 11/17/09 

APPENDIX A INSIGNIFICANT EMISSIONS UNIT .......................................................................A-1

APPENDIX B DEFINITIONS AND ABBREVIATIONS.................................................................. B-1

APPENDIX C NOTIFICATION ADDRESSES..................................................................................C-1

APPENDIX D AIR QUALITY INSPECTOR INFORMATION.......................................................D-1
OP1626-07 1 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Terms not otherwise defined in this permit or in the Definitions and Abbreviations Appendix of this 

permit have the meaning assigned to them in the referenced regulations. 

SECTION I. GENERAL INFORMATION 

The following general information is provided pursuant to ARM 17.8.1210(1). 

Company Name: Devon Energy Production Company, L.P. 

Mailing Address: P.O. Box 2606 

City: Havre State: MT Zip: 59501 

Plant Location: NW1⁄4 of Section 29, Township 31 North, Range 18 East, in Blaine County 

Responsible Official: Tracy Carter Phone: (405) 552-4507 

Facility Contact Person: Garry Visser Phone: (406) 357-2233 

Primary SIC Code: 4922 

Nature of Business: Natural Gas Transmission 

Description of Process: The Devon Blaine County #1 Compressor Station serves as a natural gas 

gathering, transmission and compressor station. The complex has two primary purposes. The first is to 

gather field gas and pump the gas up to the required pressure in the natural gas transmission system. Gas 

gathering and gas compression is accomplished using the compressor engines identified in Section II of 

this permit. The second purpose of the complex is to "dry" the gas as it is being processed. The gas 

contains some moisture, which must be removed from the system prior to being sent into the transmission 

system. Dehydrating the gas is accomplished with dehydration units identified in Section II of this 

permit. 
OP1626-07 2 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

SECTION II. SUMMARY OF EMISSION UNITS 

The emission units regulated by this permit are the following (ARM 17.8.1211): 

Emissions 

Unit ID Description Pollution Control Device/Practice 

EU001 5,500 brake-horsepower (bhp) Ingersoll Rand KVR 616 Compressor Engine None 

EU002 5,500 bhp Ingersoll Rand KVR 616 Compressor Engine None 

EU003 1,140 bhp Caterpillar G3516 TALE Compressor Engine Low emission package/lean-burn 

engine and electronic AFR controller 

EU004 1,140 bhp Caterpillar G3516 TALE Compressor Engine Low emission package/lean-burn 

engine and electronic AFR controller 

EU005 1,140 bhp Caterpillar G3516 TALE Compressor Engine Low emission package/lean-burn 

engine and electronic AFR controller 

EU006 60 million standard cubic feet per day (MMScfd) ALCO Dehydration Unit 

and 50 MMScfd PAMCO Dehydration Unit None 

EU007 297 bhp Waukesha L16166 Emergency Engine/Generator None 

EU 008 770 bhp Cummins GTA28 Emergency Engine/Generator None 
OP1626-07 3 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

SECTION III. PERMIT CONDITIONS 

The following requirements and conditions are applicable to the facility or to specific emission units 

located at the facility (ARM 17.8.1211, 1212, and 1213). 

A. Facility-Wide 

Conditions Rule Citation Rule Description Pollutant/Parameter Limit 

A.1 ARM 17.8.105 Testing Requirements Testing Requirements ------- 

A.2 

ARM 17.8.211 

ARM 17.8.749 

Ambient Air Quality Standards for 

Nitrogen Dioxide, and 

Conditions of Issuance of Permit 

NO2 -------- 

A.3 ARM 17.8.304(1) Visible Air Contaminants Opacity 40% 

A.4 ARM 17.8.304(2) Visible Air Contaminants Opacity 20% 

A.5 ARM 17.8.308(1) Particulate Matter (PM), Airborne Fugitive Opacity 20% 

A.6 ARM 17.8.308(2) Particulate Matter, Airborne Reasonable Precautions ------- 

A.7 ARM 17.8.308 Particulate Matter, Airborne Reasonable Precaution, 

Construction 20% 

A.8 ARM 17.8.309 Particulate Matter, 

Fuel Burning Equipment Particulate Matter 

E= 0.882 * H-0.1664 

or 

E= 1.026 * H-0.233

A.9 ARM 17.8.310 Particulate Matter, 

Industrial Processes Particulate Matter 

E= 4.10 * P0.67 

or 

E= 55 * P0.11- 40 

A.10 ARM 17.8.322(4) Sulfur Oxide Emissions, 

Sulfur in Fuel 

Sulfur in Fuel 

(liquid or solid fuels) 

1 pound per 

Million Btu fired 

A.11 ARM 17.8.322(5) Sulfur Oxide Emissions, 

 Sulfur in Fuel 

Sulfur in Fuel 

(gaseous) 

50 grains per 100 

standard cubic feet 

A.12 ARM 17.8.324(3) Hydrocarbon Emissions, 

Petroleum Products Gasoline Storage Tanks ------- 

A.13 ARM 17.8.324 Hydrocarbon Emissions, 

Petroleum Products 65,000 Gallon Capacity ------- 

A.14 ARM 17.8.324 Hydrocarbon Emissions, 

Petroleum Products 

Oil-effluent Water 

Separator ------- 

A.15 ARM 17.8.342 NESHAPs General Provisions Startup, Shutdown, and 

Malfunction (SSM) Plans ------- 

A.16 ARM 17.8.1212 Reporting Requirements Prompt Deviation 

Reporting ------- 

A.17 ARM 17.8.1212 Reporting Requirements Compliance Monitoring ------- 

A.18 ARM 17.8.1207 Reporting Requirements Annual Certification ------- 

Conditions

A.1. Pursuant to ARM 17.8.105, any person or persons responsible for the emissions of any air 

contaminant into the outdoor atmosphere shall, upon written request of the Department, provide 

the facilities and necessary equipment (including instruments and sensing devices) and shall 

conduct testing, emission or ambient, for such periods of time as may be necessary using methods 

approved by the Department. 

Compliance demonstration frequencies that list “as required by the Department” refer to ARM 

17.8.105. In addition, for such sources, compliance with limits and conditions listing “as required 

by the Department” as the frequency, is verified annually using emission factors and engineering 
OP1626-07 4 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

calculations by the Department’s compliance inspectors during the annual emission inventory 

review; in the case of Method 9 tests, compliance is monitored during the regular inspection by the 

compliance inspector. 

A.2. Pursuant to ARM 17.8.211 and ARM 17.8.749, Devon shall extend the existing fence line at the 

site to enclose the 26-acre area that was specified in the ambient air modeling submitted by Devon 

in its Montana Air Quality Permit Application in order to comply with the Montana Ambient Air 

Quality Standard for NO2. This fence shall be constructed in a manner adequate to restrict the 

general public from the premises, and Devon shall post “No Trespassing” signs in a manner 

adequate to deter access by the general public. 

A.3. Pursuant to ARM 17.8.304(1), Devon shall not cause or authorize emissions to be discharged into 

the outdoor atmosphere from any source installed on or before November 23, 1968, that exhibit an 

opacity of 40% or greater averaged over 6 consecutive minutes, unless otherwise specified by rule 

or in this permit. 

A.4. Pursuant to ARM 17.8.304(2), Devon shall not cause or authorize emissions to be discharged into 

the outdoor atmosphere from any source installed after November 23, 1968, that exhibit an opacity 

of 20% or greater averaged over 6 consecutive minutes, unless otherwise specified by rule or in 

this permit. 

A.5. Pursuant to ARM 17.8.308(1), Devon shall not cause or authorize the production, handling, 

transportation, or storage of any material unless reasonable precautions to control emissions of 

particulate matter are taken. Such emissions of airborne particulate matter from any stationary 

source shall not exhibit an opacity of 20% or greater averaged over 6 consecutive minutes, unless 

otherwise specified by rule or in this permit. 

A.6. Pursuant to ARM 17.8.308(2), Devon shall not cause or authorize the use of any street, road or 

parking lot without taking reasonable precautions to control emissions of airborne particulate 

matter, unless otherwise specified by rule or in this permit. 

A.7. Pursuant to ARM 17.8.308, Devon shall not operate a construction site or demolition project 

unless reasonable precautions are taken to control emissions of airborne particulate matter. Such 

emissions of airborne particulate matter from any stationary source shall not exhibit an opacity of 

20% or greater averaged over 6 consecutive minutes, unless otherwise specified by rule or in this 

permit. 

A.8. Pursuant to ARM 17.8.309, unless otherwise specified by rule or in this permit, Devon shall not 

cause or authorize particulate matter caused by the combustion of fuel to be discharged from any 

stack or chimney into the outdoor atmosphere in excess of the maximum allowable emissions of 

particulate matter for existing fuel burning equipment and new fuel burning equipment calculated 

using the following equations: 

For existing fuel burning equipment (installed before November 23, 1968): 

E =0.882 * H-0.1664

For new fuel burning equipment (installed on or after November 23, 1968): 

E =1.026 * H-0.233

Where H is the heat input capacity in million BTU (MMBtu) per hour and E is the maximum 

allowable particulate emissions rate in pounds per MMBtu. 
OP1626-07 5 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

A.9. Pursuant to ARM 17.8.310, unless otherwise specified by rule or in this permit, Devon shall not 

cause or authorize particulate matter to be discharged from any operation, process, or activity into 

the outdoor atmosphere in excess of the maximum hourly allowable emissions of particulate 

matter calculated using the following equations: 

For process weight rates up to 30 tons per hour: E = 4.10 * P0.67

For process weight rates in excess of 30 tons per hour: E = 55.0 * P0.11 – 40 

Where E = rate of emissions in pounds per hour and p = process weight rate in tons per hour. 

A.10. Pursuant to ARM 17.8.322(4), Devon shall not burn liquid or solid fuels containing sulfur in 

excess of 1 pound per million BTU fired, unless otherwise specified by rule or in this permit. 

A.11. Pursuant to ARM 17.8.322(5), Devon shall not burn any gaseous fuel containing sulfur 

compounds in excess of 50 grains per 100 cubic feet of gaseous fuel, calculated as hydrogen 

sulfide at standard conditions, unless otherwise specified by rule or in this permit. 

A.12. Pursuant to ARM 17.8.324(3), Devon shall not load or permit the loading of gasoline into any 

stationary tank with a capacity of 250 gallons or more from any tank truck or trailer, except 

through a permanent submerged fill pipe, unless such tank is equipped with a vapor loss control 

device or is a pressure tank as described in ARM 17.8.324(1), unless otherwise specified by rule 

or in this permit. 

A.13. Pursuant to ARM 17.8.324, unless otherwise specified by rule or in this permit, Devon shall not 

place, store or hold in any stationary tank, reservoir or other container of more than 65,000 gallon 

capacity any crude oil, gasoline or petroleum distillate having a vapor pressure of 2.5 pounds per 

square inch absolute or greater under actual storage conditions, unless such tank, reservoir or other 

container is a pressure tank maintaining working pressure sufficient at all times to prevent 

hydrocarbon vapor or gas loss to the atmosphere, or is designed and equipped with a vapor loss 

control device, properly installed, in good working order and in operation. 

A.14. Pursuant to ARM 17.8.324, unless otherwise specified by rule or in this permit, Devon shall not 

use any compartment of any single or multiple-compartment oil-effluent water separator, which 

compartment receives effluent water containing 200 gallons a day or more of any petroleum 

product from any equipment processing, refining, treating, storing or handling kerosene or other 

petroleum product of equal or greater volatility than kerosene, unless such compartment is 

equipped with a vapor loss control device, constructed so as to prevent emission of hydrocarbon 

vapors to the atmosphere, properly installed, in good working order, and in operation. 

A.15. Pursuant to ARM 17.8.342 and 40 Code of Federal Regulations (CFR) 63.6, Devon shall submit to 

the Department a copy of any SSM plan required under 40 CFR 63.6(e)(3) within 30 days of the 

effective date of this operating permit (if not previously submitted), within 30 days of the 

compliance date of any new National Emission Standards for Hazardous Air Pollutants 

(NESHAP) or Maximum Achievable Control Technology (MACT) standard, and within 30 days 

of the revision of any such SSM plan, when applicable. The Department requests submittal of 

such plans in electronic form, when possible. 

A.16. Devon shall promptly report deviations from permit requirements including those attributable to 

upset conditions, as upset is defined in the permit. To be considered prompt, deviations shall be 

reported to the Department using the schedule and content as described in Section V.E (unless 

otherwise specified in an applicable requirement) (ARM 17.8.1212). 
OP1626-07 6 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

A.17. On or before February 15 and August 15 of each year, Devon shall submit to the Department the 

compliance monitoring reports required by Section V.D. These reports must contain all 

information required by Section V.D, as well as the information required by each individual 

emissions unit. For the reports due by February 15 of each year, Devon may submit a single 

report, provided that it contains all the information required by Section V.B & V.D. Per ARM 

17.8.1207, 

any application form, report, or compliance certification submitted 

pursuant to ARM Title 17, Chapter 8, Subchapter 12 (including semiannual 

monitoring reports), shall contain certification by a responsible official of 

truth, accuracy and completeness. This certification and any other 

certification required under ARM Title 17, Chapter 8, Subchapter 12, shall 

state that, “based on information and belief formed after reasonable 

inquiry, the statements and information in the document are true, 

accurate and complete.” 

A.18. By February 15 of each year, Devon shall submit to the Department the compliance certification 

required by Section V.B. The annual certification required by Section V.B must include a 

statement of compliance based on the information available which identifies any observed, 

documented, or otherwise known instance of noncompliance for each applicable requirement. Per 

ARM 17.8.1207, 

any application form, report, or compliance certification submitted pursuant to 

ARM Title 17, Chapter 8, Subchapter 12 (including annual certifications), 

shall contain certification by a responsible official of truth, accuracy and 

completeness. This certification and any other certification required under 

ARM Title 17, Chapter 8, Subchapter 12, shall state that, “based on 

information and belief formed after reasonable inquiry, the statements and 

information in the document are true, accurate and complete.” 
OP1626-07 7 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

B. EU001 and EU002: 5,500-bhp Ingersoll Rand KVR 616 Compressor Engines 

Condition(s) Pollutant/Parameter Permit Limit Compliance 

Method 

Demonstration 

Frequency 

Reporting 

Requirements 

B.1, B.5, B.7, B.9, B.10 Opacity 20% Burning pipeline 

quality natural gas Ongoing Semi-annual 

B.2, B.5, B.7, B.9, B.10 Particulate from fuel 

combustion E=1.026*H-0.233 Burning pipeline 

quality natural gas Ongoing Semi-annual 

B.3, B.5, B.7, B.9, B.10 Sulfur compounds in 

fuel (gaseous) 

50 grains per 100 

standard cubic feet 

Burning pipeline 

quality natural gas Ongoing Semi-annual 

B.4, B.6, B.8, B10 Stack heights 45 feet above 

ground level Log Ongoing Semi-annual 

Conditions

B.1. Devon shall not cause or authorize emissions to be discharged into the outdoor atmosphere from 

any source that exhibits an opacity of 20% or greater averaged over 6 consecutive minutes (ARM 

17.8.304(2)). 

B.2. Devon shall not cause or authorize particulate matter caused by the combustion of fuel to be 

discharged from any stack or chimney into the outdoor atmosphere in excess of E=1.026*H-0.233

for existing fuel burning equipment, where: H = heat input capacity in MMBtu/hr and E = 

maximum allowable emission rate in lb/MMBtu (ARM 17.8.309). 

B.3. Devon shall not burn any gaseous fuel containing sulfur compounds in excess of 50 grains per 

100 standard cubic feet (gr/scf) of gaseous fuel, calculated as hydrogen sulfide at standard 

conditions (ARM 17.8.322(5)). 

B.4. Each 5,500 bhp Ingersoll Rand Compressor Engine shall have a minimum stack height of 45 feet 

above ground level (ARM 17.8.749). 

Compliance Demonstration

B.5. Compliance with Sections III.B.1, III.B.2, and III.B.3 may be satisfied by burning pipeline 

quality natural gas (as defined by Devon’s Federal Energy Regulatory Commission (FERC) Gas 

Tariff) (ARM 17.8.1213). 

B.6. Compliance with the stack height requirement (Section III.B.4) may be satisfied by documenting 

in a log any instance in which the stack height fell below 45 feet above ground level as required 

in Section III.B.4 (ARM 17.8.1213). 

Recordkeeping

B.7. Devon shall maintain, on site, a record documenting any instance in which a fuel other than 

pipeline quality natural gas was used in any of the 5,500-bhp Ingersoll Rand compressor engines 

to monitor compliance with Sections III.B.1, III.B.2, and III.B.3. The log shall include date, time, 

duration of alternate fuel use, and operator’s initials (ARM 17.8.1212). 

B.8. Devon shall maintain a log of any changes to the stack height on the engine(s) as described in 

III.B.6. The log shall include date, time, resulting stack height, and operators initials (ARM 

17.8.1212). 
OP1626-07 8 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Reporting 

B.9. The annual compliance certification required by Section V.B must contain a certification 

statement for the above applicable requirements (ARM 17.8.1212). 

B.10. The semiannual monitoring report shall provide (ARM 17.8.1212): 

a. Any instance in which fuel(s) other than pipeline quality natural gas were used to fuel any of 

the compressor engines (including information required in the log); and 

b. Any instance in which the stack height on the engine(s) fell below the minimum required 

height (including information required in the log). 
OP1626-07 9 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

C. EU003, EU004, and EU005: 1,140-bhp Caterpillar G3516 TALE Compressor Engines 

Condition(s) Pollutant/Parameter Permit Limit Compliance 

Method 

Demonstration 

Frequency 

Reporting 

Requirements 

C.1, C.11, C.16, 

C.20, C22, C23 Opacity 20% 

C.2, C.11, C.16, 

C.22, C.23 

Particulate from fuel 

combustion E=1.026*H-0.233

C.3, C.11, C.16, 

C.22, C23 

Sulfur compounds in 

fuel (gaseous) 50 gr/ 100 scf 

Burning pipeline 

quality natural gas Ongoing Semi-annual 

C.4, C.12, C.13, 

C.17, C.22, C23 

Low emission 

package 

Operate as lean-burn 

engine 

Inspection, 

maintenance, 

operation 

Ongoing Semi-annual 

C.5, C.12, C.13, 

C.17, C.22, C23 AFR controller Proper operation 

Inspection, 

maintenance, 

operation 

Ongoing Semi-annual 

C.6, C.13, C.17, C22, 

C23 Engine speed 1400 revolutions per 

minute (rpm) Log 

Weekly or 

during 

operational 

changes 

Semi-annual 

C.7, C.14, C.18, 

C.20, C.22, C.23 Stack height 20 feet above ground level Log Ongoing Semi-annual 

C.8, C.15, C.19, 

C.21, C.22, C.23 

Oxides of Nitrogen 

(NOx)

3.02 pound per hour 

(lb/hr) Portable analyzer Semi-annual Semi-annual 

C.9, C.15, C.19, 

C.21, C.22, C.23 

Carbon Monoxide 

(CO) 4.78 lb/hr Portable analyzer Semi-annual Semi-annual 

C.10, C.11, C.16, 

C.21, C.22, C23 

Volatile Organic 

Compounds (VOC) 1.78 lb/hr Burning pipeline quality natural gas Ongoing Semi-annual 

Conditions

C.1. Devon shall not cause or authorize emissions to be discharged into the outdoor atmosphere from 

any source that exhibits an opacity of 20% or greater averaged over 6 consecutive minutes (ARM 

17.8.304(2)). 

C.2. Devon shall not cause or authorize particulate matter caused by the combustion of fuel to be 

discharged from any stack or chimney into the outdoor atmosphere in excess of E = 1.026 * 

H-0.233 for existing fuel burning equipment, where: H = heat input capacity in MMBtu/hr and E = 

maximum allowable emission rate in lb/MMBtu (ARM 17.8.309). 

C.3. Devon shall not burn any gaseous fuel containing sulfur compounds in excess of 50 gr/100 scf of 

gaseous fuel, calculated as hydrogen sulfide at standard conditions (ARM 17.8.322(5)). 

C.4. Each 1,140 bhp Caterpillar natural gas compressor engine shall be equipped with a “low emission” 

package and shall be operated as a lean-burn engine (ARM 17.8.749 and ARM 17.8.752). 

C.5. Each 1,140 bhp Caterpillar natural gas compressor engine shall be equipped with an electronic 

air/fuel ratio (AFR) controller (ARM 17.8.749 and ARM 17.8.752). 

C.6. Each 1,140 bhp Caterpillar natural gas compressor engine speed shall not exceed 1,400 rpm of 

continuous duty operation (ARM 17.8.749 and ARM 17.8.752). 

C.7. The stack height of each of the 1,140 bhp Caterpillar natural gas compressor engines shall be a 

minimum of 20 feet above ground level (ARM 17.8.749 and 17.8.752). 

C.8. NOx emissions from each of the 1,140 bhp Caterpillar natural gas compressor engines shall be 

limited to 3.02 lb/hr (ARM 17.8.752). 
OP1626-07 10 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

C.9. CO emissions from each of the 1,140 bhp Caterpillar natural gas compressor engines shall be 

limited to 4.78 lb/hr (ARM 17.8.752). 

C.10. VOC emissions from each of the 1,140 bhp Caterpillar natural gas compressor engines shall be 

limited to 1.78 lb/hr (ARM 17.8.752). 

Compliance Demonstration

C.11. Compliance with the opacity, particulate from fuel combustion, sulfur compounds if fuel 

requirements (gaseous), and VOC limitation requirements (Sections III.C.1, III.C.2, III.C.3 and 

III.C.10) may be satisfied by burning pipeline quality natural gas (as defined by Devon’s FERC 

Gas Tariff), on an ongoing basis (ARM 17.8.1213). 

C.12. Compliance with the low emission package/lean-burn engine requirements and the electronic AFR 

controller requirement (Sections III.C.4 and III.C.5) may be monitored by the following (ARM 

17.8.1213): 

a. Operating and maintaining the lean-burn engine and the electronic AFR controller within the 

parameters recommended by the equipment manufacturer; and 

b. Inspecting the lean-burn engine and the electronic AFR controller at least once every 6 months 

and after every upset condition which could have caused damage to the control equipment and 

conducting any subsequent maintenance to ensure that the control equipment will continue to 

perform as designed. 

C.13. Devon shall maintain a weekly log, or during any operational change, of the low emission 

package, the AFR controller, and engine speed parameters listed below (ARM 17.8.1213): 

a. Gas production rate (MMScfd) 

b. Suction temperature 

c. Discharge pressure 

d. Engine fan horsepower 

e. Setting of the lean-burn engine and AFR controller 

f. Changes to the settings of the lean-burn engine or AFR controller 

g. Maintenance performed on the lean-burn engine or the AFR controller 

h. Date and time of any changes or maintenance as well as logging entry 

i. Operator identification 

C.14. Compliance with the stack height requirement may be satisfied by documenting in a log any 

instance in which any of the stack heights fell below 20 feet above ground level as required in 

Section III.C.7 (ARM 17.8.1213). 

C.15. Semiannually or whenever changes are made that may cause emissions to exceed permitted levels, 

Devon shall conduct an emissions test with a portable analyzer in order to monitor the NOx and 

CO emissions from the compressor engines. The portable analyzer shall be capable of achieving 

performance specifications equivalent to EPA traditional methods defined in 40 CFR 60, 

Appendix A, or shall be capable of meeting the requirements of EPA Conditional Test Method 

030 for the “Determination of Nitrogen Oxides, Carbon Monoxide, and Oxygen Emissions from 

Natural Gas-Fired Engines, Boilers and Process Heaters Using Portable Analyzers.” Devon may 

use another testing procedure as approved in advance by the Department. All compliance tests 

must be conducted in accordance to the Montana Source Test Protocol and Procedures Manual 

(ARM 17.8.106). Devon shall monitor compliance with the NOx and CO limitations in Sections 

III.C.8 and III.C.9 for the compressor engines by converting the emissions test results (ppm) to a 

mass emissions rate (lb/hr). Stack gas flow rates shall be determined using EPA Test Methods in 

40 CFR 60, Appendix A (ARM 17.8.1213). 
OP1626-07 11 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Recordkeeping 

C.16. Devon shall maintain a record documenting any instance in which a fuel other than pipeline 

quality natural gas was used in any of the 1,140-bhp Caterpillar Compressor Engines to monitor 

compliance with Sections III.C.1, III.C.2, III.C.3, and III.C.10. The log shall include date, time, 

duration of alternate fuel use, and operator’s initials (ARM 17.8.1212). 

C.17. Devon shall maintain records as required by Section III.C.13 to monitor compliance with Section 

III.C.4, III.C.5, and III.C.6 (ARM 17.8.1212). 

C.18. Devon shall maintain a log of any changes to the stack heights on the engine(s) as described in 

III.C.7. The log shall include date, time, resulting stack height, and operators initials (ARM 

17.8.1212). 

C.19. During each emissions test with the portable analyzer Devon shall record, at a minimum, the 

following information for the compressor engines and the portable analyzer (ARM 17.8.1212): 

a. Facility name and location 

b. Test date 

c. Name, company, and signature of technician(s) performing the test 

d. Emissions unit number 

e. Engine make, model, and serial number 

f. Rated horsepower 

g. Fuel consumption rate (metered or estimated) 

h. Engine operating parameters (during the test) 

i. Compressor make, model and serial number 

j. Suction pressure and temperature 

k. Discharge pressure and temperature 

l. Portable analyzer make, model and serial number 

m. Calibration procedure and data 

n. Test procedure and data 

o. Original test strip-chart and/or original data print out 

p. EPA Test Method calculations 

C.20. All compliance source test recordkeeping shall be performed in accordance with the test method 

used and the Montana Source Test Protocol and Procedures Manual, and shall be maintained on 

site (or under facility’s control) (ARM 17.8.106). 

Reporting 

C.21. Any compliance source test reports must be submitted in accordance with the Montana Source 

Test Protocol and Procedures Manual (ARM 17.8.106). 

C.22. The annual compliance certification required by Section V.B must contain a certification 

statement for the above applicable requirements (ARM 17.8.1212). 

C.23. The semi-annual monitoring report shall provide (ARM 17.8.1212): 

a. A summary of results of any source testing that was performed during that semiannual period; 

b. A summary of any portable analyzer testing that was performed during that semiannual period 

(including the information listed in Section III.C.19; 
OP1626-07 12 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

c. Any instance in which fuel(s) other than pipeline quality natural gas were used to fuel any of 

the compressor engines (including information required in the log); and 

d. Any instance in which the stack height on the engine(s) fell below the minimum required 

height (including information required in the log). 
OP1626-07 13 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

D. EU006: 60 MMScfd (dry gas) Alco Dehydration Unit and 50 MMScfd (dry gas) PAMCO 

Dehydration Unit 

Condition(s) Pollutant/Parameter Permit Limit Compliance 

Method 

Demonstration 

Frequency 

Reporting 

Requirements 

D.1, D.3, D.5, 

D.7, D.8 Opacity 20% Burning pipeline quality natural gas Ongoing Semi-annual 

D.2, D.4, D6, 

D.7, D.8 

40 CFR 63, Subpart A and 

Subpart HHH 

40 CFR 63, Subpart 

A and Subpart HHH 

40 CFR 63, 

Subpart A and 

Subpart HHH 

40 CFR 63, 

Subpart A and 

Subpart HHH 

40 CFR 63, 

Subpart A and 

Subpart HHH 

Conditions

D.1. Devon shall not cause or authorize emissions to be discharged into the outdoor atmosphere from 

any source that exhibits an opacity of 20% or greater averaged over 6 consecutive minutes (ARM 

17.8.304(2)). 

D.2. Devon shall comply with all applicable standards, limitations, reporting, recordkeeping, and 

notification requirements contained in 40 CFR 63, Subpart A and Subpart HHH (ARM 17.8.340 

and 40 CFR 63, Subpart A and Subpart HHH). 

Compliance Demonstration

D.3. Compliance with the opacity requirements may be satisfied by burning pipeline quality natural gas 

(as defined by Devon’s FERC Gas Tariff), on an ongoing basis (ARM 17.8.1213). 

D.4. Devon shall monitor compliance with 40 CFR 63, Subpart A and Subpart HHH according to the 

provisions of 40 CFR 63, Subpart A and Subpart HHH (ARM 17.8.340 and 40 CFR 63, Subpart A 

and Subpart HHH). 

Recordkeeping

D.5. Devon shall maintain a record documenting any instance in which a fuel other than pipeline 

quality natural gas was used in any of the dehydration units to monitor compliance with Section 

III.D.3. The log shall include date, time, duration of alternate fuel use, and operator’s initials 

(ARM 17.8.1212). 

D.6. Devon shall maintain records required by 40 CFR 63, Subpart A and Subpart HHH according to 

the provisions of 40 CFR 63, Subpart A and Subpart HHH (ARM 17.8.340 and 40 CFR 63, 

Subpart A and Subpart HHH). 

Reporting 

D.7. The annual compliance certification required by Section V.B must contain a certification 

statement for the above applicable requirements (ARM 17.8.1212). 

D.8. The semiannual monitoring report shall provide any instance in which fuel(s) other than pipeline 

quality natural gas were used to fuel any of the dehydration units (including information required 

in the log) (ARM 17.8.1212). . 
OP1626-07 14 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

E. EU007: 297 bhp Waukesha L1616 Emergency Engine/Generator, and 

EU008: 770 bhp Cummins GTA28 Emergency Engine/Generator 

Condition(s) Pollutant/Parameter Permit Limit Compliance 

Method 

Demonstration 

Frequency 

Reporting 

Requirements 

E.1, E.6, E.7, E.9, 

E.10, E.12, E.13 Opacity 20% Burn pipeline quality natural gas Ongoing Semi-annual 

E.2, E.6, E.7, E.9, 

E.10, E.12, E.13 

Particulate from fuel 

combustion E=1.026*H-0.233 Burn pipeline quality natural gas Ongoing Semi-annual 

E.3, E.6, E.7, E.9, 

E.10, E.12, E.13 

Sulfur compounds in 

fuel (gaseous) 50 gr/ 100 SCF Burn pipeline quality natural gas Ongoing Semi-annual 

E.4, E.6, E.7, E.9, 

E.10, E.12, E.13 Operation Emergency use or planned maintenance Log As necessary Semi-annual 

E.5. E.8. E.11, E.12, 

E.13 

40 CFR 63, Subparts 

A and ZZZZ 

40 CFR 63, Subparts 

A and ZZZZ 

40 CFR 63, 

Subparts A and 

ZZZZ 

40 CFR 63, 

Subparts A and 

ZZZZ 

Semi-annual 

Conditions

E.1. Devon shall not cause or authorize emissions to be discharged into the outdoor atmosphere from 

any source that exhibit an opacity of 20% or greater averaged over 6 consecutive minutes (ARM 

17.8.304(2)). 

E.2. Devon shall not cause or authorize particulate matter caused by the combustion of fuel to be 

discharged from any stack or chimney into the outdoor atmosphere in excess of E = 1.026*H-0.233

for existing fuel burning equipment, where: H = heat input capacity in MMBtu/hr and E = 

maximum allowable emission rate in lb/MMBtu (ARM 17.8.309). 

E.3. Devon shall not burn any gaseous fuel containing sulfur compounds in excess of 50 gr/100 scf of 

gaseous fuel, calculated as hydrogen sulfide at standard conditions (ARM 17.8.322(5)). 

E.4. Devon shall operate the 297 bhp Waukesha L1616 emergency engine/generator or the 770 bhp 

Cummins GTA28 emergency engine/generator only when commercially supplied electrical power 

is not available or during periods of planned maintenance. Devon shall not operate either 

engine/generator more than 500 hours per rolling 12-month time period. Devon shall not operate 

the engine(s)/generator(s) as a part of routine operations (ARM 17.8.749). 

E.5. Devon shall comply with all applicable standards and limitations, and the reporting, recordkeeping 

and notification requirements contained in 40 CFR 63, Subparts A and ZZZZ – General Provisions 

and National Emission Standards for Hazardous Air Pollutants for Stationary Reciprocating 

Internal Combustion Engines (ARM 17.8.342 and 40 CFR 63, Subparts A and ZZZZ). 

Compliance Demonstration

E.6. Compliance with the opacity, particulate from fuel combustion, and sulfur compounds in fuel 

requirements (gaseous) (Sections III.E.1, III.E.2, and III.E.3) may be satisfied by burning pipeline 

quality natural gas (as defined by Devon’s FERC Gas Tariff), on an ongoing basis (ARM 

17.8.1213). 
OP1626-07 15 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

E.7. Devon shall log the dates and reasons for operating the emergency engine(s)/generator(s), the 

hours of operation, the estimated amount of fuel consumed by the emergency 

engine(s)/generator(s), and the operator’s initials (ARM 17.8.1213). 

E.8. Devon must meet the initial notification requirements of 40 CFR 63.6645(d) detailing the 

information required in 40 CFR 63.9(b)(2)(i) thru (v). 

Recordkeeping

E.9. Devon shall maintain a record documenting any instance in which a fuel other than pipeline 

quality natural gas was used in the 297 bhp Waukesha emergency engine/generator or the 770 bhp 

Cummins GTA28 emergency engine/generator to monitor compliance with Sections III.E.1, 

III.E.2, and III.E.3. The log shall include date, time, duration of alternate fuel use, and operator’s 

initials (ARM 17.8.1212). 

E.10. Devon shall maintain the engine(s)/generator(s) operation log required by Section III.E.6 on site 

(ARM 17.8.1212). 

E.11. Devon shall maintain any recordkeeping as required by 40 CFR 60, Subpart ZZZZ (ARM 

17.8.340, ARM 17.8.1212, and 40 CFR 60, Subpart ZZZZ). 

Reporting 

E.12. The annual compliance certification required by Section V.B must contain a certification 

statement for the above applicable requirements (ARM 17, 8.1212). 

E.13. The semiannual monitoring report shall provide (ARM 17.8.1212): 

a. Any instance in which fuel(s) other than pipeline quality natural gas were used to fuel the 

emergency engine/generators(s) (including information required in the log); and 

b. A summary of the hours of operation of the emergency engine/generator(s) (including the 

information in the log). 

c. Reference of any reporting/notification during that semiannual period, including date and 

nature of notice, pursuant to 40 CFR 63, Subpart ZZZZ. 
OP1626-07 16 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

SECTION IV. NON-APPLICABLE REQUIREMENTS 

Air Quality Administrative Rules of Montana (ARM) and Federal Regulations identified as not applicable 

to the facility or to a specific emissions unit at the time of the permit issuance are listed below (ARM 

17.8.1214). The following list does not preclude the need to comply with any new requirements that may 

become applicable during the permit term. 

A. Facility-Wide 

The following table contains non-applicable requirements, which are administrated by the Air Resources 

Management Bureau of the Department of Environmental Quality. 

Rule Citation 

State Federal 

Reason 

ARM 17.8.310 

ARM 17.8.341 The pollutant is not emitted by the facility/emitting unit 

ARM 17.8.316 

ARM 17.8.320 The facility does not utilize this type of emitting unit 

ARM 17.8.321 

ARM 17.8.323 

ARM 17.8.331-334 

ARM 17.8.610 

The facility is not in this source category 

40 CFR 57 

40 CFR 60.1-19 

40 CFR 60, Subparts C, Ca, Cb 

40 CFR 60, Subparts D, Da, Db, Dc 

40 CFR 60, Subparts E, Ea, Eb, Ec 

40 CFR 60, Subparts F-J 

40 CFR 60, Subparts K, Ka, Kb 

40 CFR 60, Subparts L-M 

40 CFR 60, Subparts N, Na 

40 CFR 60, Subparts O-Z 

40 CFR 60, Subparts AA-EE 

40 CFR 60, Subparts GG-HH 

40 CFR 60, Subparts KK-NN 

40 CFR 60, Subparts PP-XX 

40 CFR 60, Subparts AAA-BBB 

40 CFR 60, Subparts DDD 

40 CFR 60, Subparts FFF-LLL 

40 CFR 60, Subparts NNN-WWW 

40 CFR 60, Subparts AAAA-DDDD 

40 CFR 60, Appendices A-D 

These requirements are not applicable because the 

facility is either not in the source category or because no 

changes have been made at the facility to trigger the 

procedural requirements. 
OP1626-07 17 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Rule Citation 

State Federal 

Reason 

40 CFR 61, Subpart A-F 

40 CFR 61, Subparts H-L 

40 CFR 61, Subparts N-R 

40 CFR 61, Subpart T 

40 CFR 61, Subparts V-W 

40 CFR 61, Subpart Y 

40 CFR 61, Subpart BB 

40 CFR 61, Subpart FF 

40 CFR 61, Appendices A-E 

40 CFR 63, Subpart B 

40 CFR 63, Subparts F-I 

40 CFR 63, Subparts L-O 

40 CFR 63, Subparts Q-U 

40 CFR 63, Subparts W-Y 

40 CFR 63, Subparts AA-EE 

40 CFR 63, Subparts GG-MM 

40 CFR 63, Subparts OO-WW 

40 CFR 63, Subpart YY 

40 CFR 63, Subparts CCC-EEE 

40 CFR 63, Subparts GGG 

40 CFR 63, Subparts III-JJJ 

40 CFR 63, Subparts LLL-RRR 

40 CFR 63, Subparts TTT-VVV 

40 CFR 63, Subpart XXX 

40 CFR 63, Subpart CCCC 

40 CFR 63, Subpart GGGG 

40 CFR 63, Subpart HHHH 

40 CFR 63, Subparts SSSS-VVVV 

40 CFR 63, Subpart XXXX 

40 CFR 63, Subpart QQQQQ 

40 CFR 63, Appendices A-E 

40 CFR 72-80

40 CFR 85 

These requirements are not applicable because the 

facility either does not emit the pollutant or because the 

facility is not in the source category. 

B. Emission Units 

The permit application identified applicable requirements: non-applicable requirements for individual or 

specific emission units were not listed. The Department has listed all non-applicable requirements in 

Section IV.A, these requirements relate to each specific unit, as well as facility wide. 
OP1626-07 18 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

SECTION V. GENERAL PERMIT CONDITIONS 

A. Compliance Requirements 

ARM 17.8, Subchapter 12, Operating Permit Program §1210(2)(a)-(c)&(e), §1206(6)(c)&(b)

1. The permittee must comply with all conditions of the permit. Any noncompliance with the 

terms or conditions of the permit constitutes a violation of the Montana Clean Air Act, and may 

result in enforcement action, permit modification, revocation and reissuance, or termination, or 

denial of a permit renewal application under ARM Title 17, Chapter 8, Subchapter 12. 

2. The filing of a request by the permittee for a permit modification, revocation and reissuance, or 

termination, or of a notification of planned changes or anticipated noncompliance does not stay 

any permit condition. 

3. It shall not be a defense for a permittee in an enforcement action that it would have been 

necessary to halt or reduce the permitted activity in order to maintain compliance with the 

conditions of the permit. If appropriate, this factor may be considered as a mitigating factor in 

assessing a penalty for noncompliance with an applicable requirement if the source 

demonstrates that both the health, safety or environmental impacts of halting or reducing 

operations would be more serious than the impacts of continuing operations, and that such 

health, safety or environmental impacts were unforeseeable and could not have otherwise been 

avoided. 

4. The permittee shall furnish to the Department, within a reasonable time set by the Department 

(not to be less than 15 days), any information that the Department may request in writing to 

determine whether cause exists for modifying, revoking and reissuing, or terminating the 

permit, or to determine compliance with the permit. Upon request, the permittee shall also 

furnish to the Department copies of those records that are required to be kept pursuant to the 

terms of the permit. This subsection does not impair or otherwise limit the right of the 

permittee to assert the confidentiality of the information requested by the Department, as 

provided in 75-2-105, MCA. 

5. Any schedule of compliance for applicable requirements with which the source is not in 

compliance with at the time of permit issuance shall be supplemental to, and shall not sanction 

noncompliance with, the applicable requirements on which it was based. 

6. For applicable requirements that will become effective during the permit term, the source shall 

meet such requirements on a timely basis unless a more detailed plan or schedule is required by 

the applicable requirement or the Department. 

B. Certification Requirements 

ARM 17.8, Subchapter 12, Operating Permit Program §1207 and §1213(7)(a)&(c)-(d)

1. Any application form, report, or compliance certification submitted pursuant to ARM Title 17, 

Chapter 8, Subchapter 12, shall contain certification by a responsible official of truth, accuracy, 

and completeness. This certification and any other certification required under ARM Title 17, 

Chapter 8, Subchapter 12, shall state that, based on information and belief formed after 

reasonable inquiry, the statements and information in the document are true, accurate and 

complete. 

2. Compliance certifications shall be submitted by February 15 of each year, or more frequently if 

otherwise specified in an applicable requirement or elsewhere in the permit. Each certification 

must include the required information for the previous calendar year (i.e., January 1 – 

December 31). 
OP1626-07 19 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

3. Compliance certifications shall include the following: 

a. The identification of each term or condition of the permit that is the basis of the 

certification; 

b. The identification of the method(s) or other means used by the owner or operator for 

determining the status of compliance with each term and condition during the certification 

period, consistent with ARM 17.8.1212; 

c. The status of compliance with each term and condition for the period covered by the 

certification, including whether compliance during the period was continuous or 

intermittent (based on the method or means identified in ARM 17.8.1213(7)(c)(ii), as 

described above); and 

d. Such other facts as the Department may require to determine the compliance status of the 

source. 

4. All compliance certifications must be submitted to the Environmental Protection Agency, as 

well as to the Department, at the addresses listed in the Notification Addresses Appendix of this 

permit. 

C. Permit Shield 

ARM 17.8, Subchapter 12, Operating Permit Program §1214(1)-(4)

1. The applicable requirements and non-federally enforceable requirements are included and 

specifically identified in this permit and the permit includes a precise summary of the 

requirements not applicable to the source. Compliance with the conditions of the permit shall 

be deemed compliance with any applicable requirements and any non-federally enforceable 

requirements as of the date of permit issuance. 

2. The permit shield described in 1 above shall remain in effect during the appeal of any permit 

action (renewal, revision, reopening, or revocation and reissuance) to the Board of 

Environmental Review (Board), until such time as the Board renders its final decision. 

3. Nothing in this permit alters or affects the following: 

a. The provisions of Sec. 7603 of the FCAA, including the authority of the administrator 

under that section; 

b. The liability of an owner or operator of a source for any violation of applicable 

requirements prior to or at the time of permit issuance; 

c. The applicable requirements of the Acid Rain Program, consistent with Sec. 7651g(a) of 

the FCAA; 

d. The ability of the administrator to obtain information from a source pursuant to Sec. 7414 

of the FCAA; 

e. The ability of the Department to obtain information from a source pursuant to the Montana 

Clean Air Act, Title 75, Chapter 2, MCA; 

f. The emergency powers of the Department under the Montana Clean Air Act, Title 75, 

Chapter 2, MCA; and 
OP1626-07 20 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

g. The ability of the Department to establish or revise requirements for the use of Reasonably 

Available Control Technology (RACT) as defined in ARM Title 17, Chapter 8. However, 

if the inclusion of a RACT into the permit pursuant to ARM Title 17, Chapter 8, 

Subchapter 12, is appealed to the Board, the permit shield, as it applies to the source’s 

existing permit, shall remain in effect until such time as the Board has rendered its final 

decision. 

4. Nothing in this permit alters or affects the ability of the Department to take enforcement action 

for a violation of an applicable requirement or permit term demonstrated pursuant to ARM 

17.8.106, Source Testing Protocol. 

5. Pursuant to ARM 17.8.132, for the purpose of submitting a compliance certification, nothing in 

these rules shall preclude the use, including the exclusive use, of any credible evidence or 

information relevant to whether a source would have been in compliance. However, when 

compliance or noncompliance is demonstrated by a test or procedure provided by permit or 

other applicable requirements, the source shall then be presumed to be in compliance or 

noncompliance unless that presumption is overcome by other relevant credible evidence. 

6. The permit shield will not extend to minor permit modifications or changes not requiring a 

permit revision (see Sections I & J). 

7. The permit shield will extend to significant permit modifications and transfer or assignment of 

ownership (see Sections K & O). 

D. Monitoring, Recordkeeping, and Reporting Requirements 

ARM 17.8, Subchapter 12, Operating Permit Program §1212(2)&(3)

1. Unless otherwise provided in this permit, the permittee shall maintain compliance monitoring 

records that include the following information: 

a. The date, place as defined in the permit, and time of sampling or measurement; 

b. The date(s) analyses were performed; 

c. The company or entity that performed the analyses; 

d. The analytical techniques or methods used; 

e. The results of such analyses; and 

f. The operating conditions at the time of sampling or measurement. 

2. The permittee shall retain records of all required monitoring data and support information for a 

period of at least 5 years from the date of the monitoring sample, measurement, report, or 

application. Support information includes all calibration and maintenance records and all 

original strip-chart recordings for continuous monitoring instrumentation, and copies of all 

reports required by the permit. All monitoring data, support information, and required reports 

and summaries may be maintained in computerized form at the plant site if the information is 

made available to Department personnel upon request, which may be for either hard copies or 

computerized format. Strip-charts must be maintained in their original form at the plant site 

and shall be made available to Department personnel upon request. 
OP1626-07 21 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

3. The permittee shall submit to the Department, at the addresses located in the Notification 

Addresses Appendix of this permit, reports of any required monitoring by February 15 and 

August 15 of each year, or more frequently if otherwise specified in an applicable requirement 

or elsewhere in the permit. The monitoring report submitted on February 15 of each year must 

include the required monitoring information for the period of July 1 through December 31 of 

the previous year. The monitoring report submitted on August 15 of each year must include the 

required monitoring information for the period of January 1 through June 30 of the current year. 

All instances of deviations from the permit requirements must be clearly identified in such 

reports. All required reports must be certified by a responsible official, consistent with ARM 

17.8.1207. 

E. Prompt Deviation Reporting 

ARM 17.8, Subchapter 12, Operating Permit Program §1212(3)(c)

The permittee shall promptly report deviations from permit requirements, including those attributable 

to upset conditions as defined in the permit, the probable cause of such deviations, and any corrective 

actions or preventive measures taken. To be considered prompt, deviations shall be reported to the 

Department within the following timeframes (unless otherwise specified in an applicable 

requirement): 

1. For deviations which may result in emissions potentially in violation of permit limitations: 

a. An initial phone notification (or faxed or electronic notification) describing the incident 

within 24 hours (or the next business day) of discovery; and, 

b. A follow-up written, faxed, or electronic report within 30 days of discovery of the deviation 

that describes the probable cause of the reported deviation and any corrective actions or 

preventative measures taken. 

2. For deviations attributable to malfunctions, deviations shall be reported to the Department in 

accordance with the malfunction reporting requirements under ARM 17.8.110; and 

3. For all other deviations, deviations shall be reported to the Department via a written, faxed, or 

electronic report within 90 days of discovery (as determined through routine internal review by 

the permittee). 

Prompt deviation reports do not need to be resubmitted with regular semiannual (or other routine) 

reports, but may be referenced by the date of submittal. 

F. Emergency Provisions 

ARM 17.8, Subchapter 12, Operating Permit Program §1201(13) and §1214(5), (6)&(8)

1. An “emergency” means any situation arising from sudden and reasonably unforeseeable events 

beyond the control of the source, including acts of God, which situation requires immediate 

corrective action to restore normal operation and causes the source to exceed a technologybased emission limitation under this permit due to the unavoidable increases in emissions 

attributable to the emergency. An emergency shall not include noncompliance to the extent 

caused by improperly designed equipment, lack of reasonable preventive maintenance, careless 

or improper operation, or operator error. 

2. An emergency constitutes an affirmative defense to an action brought for noncompliance with a 

technology-based emission limitation if the permittee demonstrates through properly signed, 

contemporaneous logs, or other relevant evidence, that: 
OP1626-07 22 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

a. An emergency occurred and the permittee can identify the cause(s) of the emergency; 

b. The permitted facility was at the time being properly operated; 

c. During the period of the emergency the permittee took all reasonable steps to minimize 

levels of emissions that exceeded the emission standards or other requirements in the 

permit; and 

d. The permittee submitted notice of the emergency to the Department within 2 working days 

of the time when emission limitations were exceeded due to the emergency. This notice 

fulfills the requirements of ARM 17.8.1212(3)(c). This notice must contain a description 

of the emergency, any steps taken to mitigate emissions, and corrective actions taken. 

3. These emergency provisions are in addition to any emergency, malfunction or upset provision 

contained in any applicable requirement. 

G. Inspection and Entry 

ARM 17.8, Subchapter 12, Operating Permit Program §1213(3)&(4)

1. Upon presentation of credentials and other requirements as may be required by law, the 

permittee shall allow the Department, the administrator, or an authorized representative 

(including an authorized contractor acting as a representative of the Department or the 

administrator) to perform the following: 

a. Enter the premises where a source required to obtain a permit is located or emissionsrelated activity is conducted, or where records must be kept under the conditions of the 

permit; 

b. Have access to and copy, at reasonable times, any records that must be kept under the 

conditions of the permit; 

c. Inspect at reasonable times any facilities, emission units, equipment (including monitoring 

and air pollution control equipment), practices, or operations regulated or required under 

the permit; and 

d. As authorized by the Montana Clean Air Act and rules promulgated thereunder, sample or 

monitor, at reasonable times, any substances or parameters at any location for the purpose 

of assuring compliance with the permit or applicable requirements. 

2. The permittee shall inform the inspector of all workplace safety rules or requirements at the 

time of inspection. This section shall not limit in any manner the Department’s statutory right 

of entry and inspection as provided for in 75-2-403, MCA. 

H. Fee Payment 

ARM 17.8, Subchapter 12, Operating Permit Program §1210(2)(f) and ARM 17.8, Subchapter 5, Air 

Quality Permit Application, Operation, and Open Burning Fees §505(3)-(5) (STATE ONLY)

1. The permittee must pay application and operating fees, pursuant to ARM Title 17, Chapter 8, 

Subchapter 5. 

2. Annually, the Department shall provide the permittee with written notice of the amount of the 

fee and the basis for the fee assessment. The air quality operation fee is due 30 days after 

receipt of the notice, unless the fee assessment is appealed pursuant to ARM 17.8.511. If any 
OP1626-07 23 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

portion of the fee is not appealed, that portion of the fee that is not appealed is due 30 days after 

receipt of the notice. Any remaining fee, which may be due after the completion of an appeal, 

is due immediately upon issuance of the Board’s decision or upon completion of any judicial 

review of the Board’s decision. 

3. If the permittee fails to pay the required fee (or any required portion of an appealed fee) within 

90 days of the due date of the fee, the Department may impose an additional assessment of 15% 

of the fee (or any required portion of an appealed fee) or $100, whichever is greater, plus 

interest on the fee (or any required portion of an appealed fee), computed at the interest rate 

established under 15-31-510(3), MCA. 

I. Minor Permit Modifications 

ARM 17.8, Subchapter 12, Operating Permit Program §1226(3)&(11)

1. An application for a minor permit modification need only address in detail those portions of the 

permit application that require revision, updating, supplementation, or deletion, and may 

reference any required information that has been previously submitted. 

2. The permit shield under ARM 17.8.1214 will not extend to any minor modifications processed 

pursuant to ARM 17.8.1226. 

J. Changes Not Requiring Permit Revision 

ARM 17.8, Subchapter 12, Operating Permit Program §1224(1)-(3), (5)&(6)

1. The permittee is authorized to make changes within the facility as described below, provided 

the following conditions are met: 

a. The proposed changes do not require the permittee to obtain a Montana Air Quality Permit 

under ARM Title 17, Chapter 8, Subchapter7; 

b. The proposed changes are not modifications under Title I of the FCAA, or as defined in 

ARM Title 17, Chapter 8, Subchapters 8, 9, or 10; 

c. The emissions resulting from the proposed changes do not exceed the emissions allowable 

under this permit, whether expressed as a rate of emissions or in total emissions; 

d. The proposed changes do not alter permit terms that are necessary to enforce applicable 

emission limitations on emission units covered by the permit; and 

e. The facility provides the administrator and the Department with written notification at least 

7 days prior to making the proposed changes. 

2. The permittee and the Department shall attach each notice provided pursuant to 1.e above to 

their respective copies of this permit. 

3. Pursuant to the conditions above, the permittee is authorized to make Sec. 502(b)(10) changes, 

as defined in ARM 17.8.1201(30), without a permit revision. For each such change, the written 

notification required under 1.e above shall include a description of the change within the 

source, the date on which the change will occur, any change in emissions, and any permit term 

or condition that is no longer applicable as a result of the change. 
OP1626-07 24 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

4. The permittee may make a change not specifically addressed or prohibited by the permit terms 

and conditions without requiring a permit revision, provided the following conditions are met: 

a. Each proposed change does not weaken the enforceability of any existing permit 

conditions; 

b. The Department has not objected to such change; 

c. Each proposed change meets all applicable requirements and does not violate any existing 

permit term or condition; and 

d. The permittee provides contemporaneous written notice to the Department and the 

administrator of each change that is above the level for insignificant emission units as 

defined in ARM 17.8.1201(22) and 17.8.1206(3), and the written notice describes each 

such change, including the date of the change, any change in emissions, pollutants emitted, 

and any applicable requirement that would apply as a result of the change. 

5. The permit shield authorized by ARM 17.8.1214 shall not apply to changes made pursuant to 

ARM 17.8.1224(3) and (5), but is applicable to terms and conditions that allow for increases 

and decreases in emissions pursuant to ARM 17.8.1224(4). 

K. Significant Permit Modifications 

ARM 17.8, Subchapter 12, Operating Permit Program §1227(1), (3)&(4)

1. The modification procedures set forth in 2 below must be used for any application requesting a 

significant modification of this permit. Significant modifications include the following: 

a. Any permit modification that does not qualify as either a minor modification or as an 

administrative permit amendment; 

b. Every significant change in existing permit monitoring terms or conditions; 

c. Every relaxation of permit reporting or recordkeeping terms or conditions that limit the 

Department’s ability to determine compliance with any applicable rule, consistent with the 

requirements of the rule; or 

d. Any other change determined by the Department to be significant. 

2. Significant modifications shall meet all requirements of ARM Title 17, Chapter 8, including 

those for applications, public participation, and review by affected states and the administrator, 

as they apply to permit issuance and renewal, except that an application for a significant permit 

modification need only address in detail those portions of the permit application that require 

revision, updating, supplementation or deletion. 

3. The permit shield provided for in ARM 17.8.1214 shall extend to significant modifications. 

L. Reopening for Cause 

ARM 17.8, Subchapter 12, Operating Permit Program §1228(1)&(2)

1. This permit may be reopened and revised under the following circumstances: 

a. Additional applicable requirements under the FCAA become applicable to the facility when 

the permit has a remaining term of 3 or more years. Reopening and revision of the permit 

shall be completed not later than 18 months after promulgation of the applicable 

requirement. No reopening is required under ARM 17.8.1228(1)(a) if the effective date of 
OP1626-07 25 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

the applicable requirement is later than the date on which the permit is due to expire, unless 

the original permit or any of its terms or conditions have been extended pursuant to ARM 

17.8.1220(12) or 17.8.1221(2); 

b. Additional requirements (including excess emission requirements) become applicable to an 

affected source under the Acid Rain Program. Upon approval by the administrator, excess 

emission offset plans shall be deemed incorporated into the permit; 

c. The Department or the administrator determines that the permit contains a material mistake 

or that inaccurate statements were made in establishing the emission standards or other 

terms or conditions of the permit; or 

d. The administrator or the Department determines that the permit must be revised or revoked 

and reissued to ensure compliance with the applicable requirements. 

M. Permit Expiration and Renewal 

ARM 17.8, Subchapter 12, Operating Permit Program §1210(2)(g), §1220(11)&(12), and §1205(2)(d)

1. This permit is issued for a fixed term of 5 years. 

2. Renewal of this permit is subject to the same procedural requirements that apply to permit 

issuance, including those for application, content, public participation, and affected state and 

administrator review. 

3. Expiration of this permit terminates the permittee’s right to operate unless a timely and 

administratively complete renewal application has been submitted consistent with ARM 

17.8.1221 and 17.8.1205(2)(d). If a timely and administratively complete application has been 

submitted, all terms and conditions of the permit, including the application shield, remain in 

effect after the permit expires until the permit renewal has been issued or denied. 

4. For renewal, the permittee shall submit a complete air quality operating permit application to 

the Department not later than 6 months prior to the expiration of this permit, unless otherwise 

specified. If necessary to ensure that the terms of the existing permit will not lapse before 

renewal, the Department may specify, in writing to the permittee, a longer time period for 

submission of the renewal application. Such written notification must be provided at least 1 

year before the renewal application due date established in the existing permit. 

N. Severability Clause 

ARM 17.8, Subchapter 12, Operating Permit Program §1210(2)(i)&(l)

1. The administrative appeal or subsequent judicial review of the issuance by the Department of 

an initial permit under this subchapter shall not impair in any manner the underlying 

applicability of all applicable requirements, and such requirements continue to apply as if a 

final permit decision had not been reached by the Department. 

2. If any provision of a permit is found to be invalid, all valid parts that are severable from the 

invalid part remain in effect. If a provision of a permit is invalid in one or more of its 

applications, the provision remains in effect in all valid applications that are severable from the 

invalid applications. 
OP1626-07 26 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

O. Transfer or Assignment of Ownership 

ARM 17.8, Subchapter 12, Operating Permit Program §1225(2)&(4)

1. If an administrative permit amendment involves a change in ownership or operational control, 

the applicant must include in its request to the Department a written agreement containing a 

specific date for the transfer of permit responsibility, coverage and liability between the current 

and new permittee. 

2. The permit shield provided for in ARM17.8.1214 shall not extend to administrative permit 

amendments. 

P. Emissions Trading, Marketable Permits, Economic Incentives 

ARM 17.8, Subchapter 12, Operating Permit Program §1226(2)

Notwithstanding ARM 17.8.1226(1) and (7), minor air quality operating permit modification 

procedures may be used for permit modifications involving the use of economic incentives, 

marketable permits, emissions trading, and other similar approaches, to the extent that such minor 

permit modification procedures are explicitly provided for in the Montana State Implementation Plan 

or in applicable requirements promulgated by the administrator. 

Q. No Property Rights Conveyed 

ARM 17.8, Subchapter 12, Operating Permit Program §1210(2)(d)

This permit does not convey any property rights of any sort, or any exclusive privilege. 

R. Testing Requirements 

ARM 17.8, Subchapter 1, General Provisions §105

The permittee shall comply with ARM 17.8.105. 

S. Source Testing Protocol 

ARM 17.8, Subchapter 1, General Provisions §106

The permittee shall comply with ARM 17.8.106. 

T. Malfunctions 

ARM 17.8, Subchapter 1, General Provisions §110

The permittee shall comply with ARM 17.8.110. 

U. Circumvention 

ARM 17.8, Subchapter 1, General Provisions §111

The permittee shall comply with ARM 17.8.111. 

V. Motor Vehicles 

ARM 17.8, Subchapter 3, Emission Standards §325

The permittee shall comply with ARM 17.8.325. 
OP1626-07 27 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

W. Annual Emissions Inventory 

ARM 17.8, Subchapter 5, Air Quality Permit Application, Operation and Open Burning Fees §505 

(STATE ONLY)

The permittee shall supply the Department with annual production and other information for all 

emission units necessary to calculate actual or estimated actual amount of air pollutants emitted 

during each calendar year. Information shall be gathered on a calendar-year basis and submitted to 

the Department by the date required in the emission inventory request, unless otherwise specified in 

this permit. Information shall be in the units required by the Department. 

X. Open Burning 

ARM 17.8, Subchapter 6, Open Burning §604, 605 and 606

The permittee shall comply with ARM 17.8.604, 605 and 606. 

Y. Montana Air Quality Permits 

ARM 17.8, Subchapter 7, Permit, Construction and Operation of Air Contaminant Sources §745 and 

764 (ARM 17.8.745(1), and 764(1)(b) are STATE ENFORCEABLE ONLY until approval by the 

EPA as part of the SIP) 

1. Except as specified, no person shall construct, install, modify or use any air contaminant source 

or stack associated with any source without first obtaining a permit from the Department or 

Board. A permit is not required for those sources or stacks as specified by ARM 

17.8.744(1)(a)-(k). 

2. The permittee shall comply with ARM 17.8.743, 744, 745, 748, and 764. 

3. ARM 17.8.745(1) specifies de minimis changes as construction or changed conditions of 

operation at a facility holding an air quality preconstruction permit issued under Chapter 8 that 

does not increase the facility’s potential to emit by more than 15 tons per year of any pollutant, 

except (STATE ENFORCEABLE ONLY until approved by the EPA as part of the SIP): 

a. Any construction or changed condition that would violate any condition in the facility’s 

existing MAQP or any applicable rule contained in Chapter 8 is prohibited, except as 

provided in ARM 17.8.745(2); 

b. Any construction or changed conditions of operation that would qualify as a major 

modification under Subchapters 8, 9 or 10 of Chapter 8; 

c. Any construction or changed condition of operation that would affect the plume rise or 

dispersion characteristic of emissions that would cause or contribute to a violation of an 

ambient air quality standard or ambient air increment as defined in ARM 17.8.804; 

d. Any construction or improvement project with a potential to emit more than 15 tons per 

year may not be artificially split into smaller projects to avoid Montana Air Quality 

Permitting; or 

e. Emission reductions obtained through offsetting within a facility are not included when 

determining the potential emission increase from construction or changed conditions of 

operation, unless such reductions are made federally enforceable. 

4. Any facility making a de minimis change pursuant to ARM 17.8.745(1) shall notify the 

Department if the change would include a change in control equipment, stack height, stack 

diameter, stack gas temperature, source location or fuel specifications, or would result in an 
OP1626-07 28 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

increase in source capacity above its permitted operation or the addition of a new emission unit. 

The notice must be submitted, in writing, 10 days prior to start up or use of the proposed de 

minimis change, or as soon as reasonably practicable in the event of an unanticipated 

circumstance causing the de minimis change, and must include the information requested in 

ARM 17.8.745(1). (STATE ENFORCEABLE ONLY until approval by the EPA as part of the 

SIP) 

Z. National Emission Standard for Asbestos 

40 CFR, Part 61, Subpart M

The permittee shall not conduct any asbestos abatement activities except in accordance with 40 CFR 

61, Subpart M (National Emission Standard for Hazardous Air Pollutants for Asbestos). 

AA. Asbestos 

ARM 17.74, Subchapter 3, General Provisions and Subchapter 4, Fees

The permittee shall comply with ARM 17.74.301, et seq., and ARM 17.74.401, et seq. (State only) 

BB. Stratospheric Ozone Protection – Servicing of Motor Vehicle Air Conditioners 

40 CFR, Part 82, Subpart B

If the permittee performs a service on motor vehicles and this service involves ozone-depleting 

substance/refrigerant in the motor vehicle air conditioner (MVAC), the permittee is subject to all the 

applicable requirements as specified in 40 CFR 82, Subpart B. 

CC. Stratospheric Ozone Protection – Recycling and Emission Reductions 

40 CFR, Part 82, Subpart F

The permittee shall comply with the standards for recycling and emission reductions in 40 CFR 82, 

Subpart F, except as provided for MVACs in Subpart B. 

1. Persons opening appliances for maintenance, service, repair, or disposal must comply with the 

required practices pursuant to §82.156; 

2. Equipment used during the maintenance, service, repair or disposal of appliances must comply 

with the standards for recycling and recovery equipment pursuant to §82.158; 

3. Persons performing maintenance, service, repair or disposal of appliances must be certified by 

an approved technical certification program pursuant to §82.161; 

4. Persons disposing of small appliances, MVACs and MVAC-like (as defined at §82.152) 

appliances must comply with recordkeeping requirements pursuant to §82.166; 

5. Persons owning commercial or industrial process refrigeration equipment must comply with the 

leak repair requirements pursuant to §82.156; 

6. Owners/operators of appliances normally containing 50 or more pounds of refrigerant must 

keep records of refrigerant purchased and added to such appliances pursuant to §82.166. 
OP1626-07 29 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

DD. Emergency Episode Plan 

The permittee shall comply with the requirements contained in Chapter 9.7 of the State of Montana 

Air Quality Control Implementation Plan. 

Each major source emitting 100 tons per year located in a Priority I Air Quality Control Region, shall 

submit to the Department a legally enforceable Emergency Episode Action Plan (EEAP) that details 

how the source will curtail emissions during an air pollutant emergency episode. The industrial 

EEAP shall be in accordance with the Department’s EEAP and shall be submitted according to a 

timetable developed by the Department, following Priority I reclassification. 

EE. Definitions 

Terms not otherwise defined in this permit or in the Definitions and Abbreviations Appendix of this 

permit, shall have the meaning assigned to them in the referenced regulations. 
OP1626-07 A-1 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Appendix A INSIGNIFICANT EMISSIONS UNIT 

Disclaimer: The information in this appendix is not State or federally enforceable, but is presented to 

assist Devon, the permitting authority, inspectors, and the public. 

Pursuant to ARM 17.8.1201(22)(a), an insignificant emission unit means any activity or emissions unit 

located within a source that: (i) has a potential to emit less than 5 tons per year of any regulated pollutant; 

(ii) has a potential to emit less than 500 pounds per year of lead; (iii) has a potential to emit less than 500 

pounds per year of hazardous air pollutants listed pursuant to Sec. 7412 (b) of the FCAA; and (iv) is not 

regulated by an applicable requirement, other than a generally applicable requirement that applies to all 

emission units subject to Subchapter 12. 

List of Insignificant Activities:

The following table of insignificant sources and/or activities was provided by Devon: 

Emissions Unit ID Description 

IEU01 (2) Natural Gas-Fired Heating Boilers (2.93 MMBtu/hr) 

IEU02 (3) Natural Gas-Fired Space Heaters (0.16 MMBtu/hr) 

IEU03 Natural Gas-Fired ALCO Triethylene Glycol (TEG) Dehydrator Still Vent 

IEU04 Natural Gas-Fired PAMCO TEG Dehydrator Still Vent 

IEU05 Natural Gas-Fired TEG Tank Heater (0.12 MMBtu/hr) 

IEU06 Natural Gas-Fired Waste Oil Tank Heater (0.10 MMBtu/hr) 

IEU07 Natural Gas-Fired Building/Heat Tracing Boiler (1.0 MMBtu/hr) 

IEU08 Natural Gas-Fired Heater Treater (1.0 MMBtu/hr) 

IEU09 2,000-Gallon Gasoline Storage Tank 

IEU10 2,000-Gallon Methanol Storage Tank 

IEU11 6,000-Gallon Methanol Storage Tank 

IEU12 500-Gallon Diesel Storage Tank 

IEU13 On-Site Vehicle Traffic 

IEU14 Miscellaneous Fugitive VOC Emissions 

.
OP1626-07 B-1 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Appendix B DEFINITIONS and ABBREVIATIONS 

"Act" means the Clean Air Act, as amended, 42 U.S. 7401, et seq. 

"Administrative permit amendment" means an air quality operating permit revision that: 

(a) Corrects typographical errors; 

(b) Identifies a change in the name, address or phone number of any person identified in the air 

quality operating permit, or identifies a similar minor administrative change at the source; 

(c) Requires more frequent monitoring or reporting by Devon; 

(d) Requires changes in monitoring or reporting requirements that the Department deems to be 

no less stringent than current monitoring or reporting requirements; 

(e) Allows for a change in ownership or operational control of a source if the Department has 

determined that no other change in the air quality operating permit is necessary, consistent 

with ARM 17.8.1225; or 

(f) Incorporates any other type of change that the Department has determined to be similar to 

those revisions set forth in (a)-(e), above 

"Applicable requirement" means all of the following as they apply to emission units in a source 

requiring an air quality operating permit (including requirements that have been promulgated or approved 

by the Department or the administrator through rule making at the time of issuance of the air quality 

operating permit, but have future-effective compliance dates, provided that such requirements apply to 

sources covered under the operating permit): 

(a) Any standard, rule, or other requirement, including any requirement contained in a consent 

decree or judicial or administrative order entered into or issued by the Department, that is 

contained in the Montana state implementation plan approved or promulgated by the 

administrator through rule making under Title I of the FCAA; 

(b) Any federally enforceable term, condition or other requirement of any Montana Air Quality 

Permit issued by the Department under Subchapters 7, 8, 9 and 10 of this chapter, or pursuant 

to regulations approved or promulgated through rule making under Title I of the FCAA, 

including parts C and D; 

(c) Any standard or other requirement under Sec. 7411 of the FCAA, including Sec. 7411(d); 

(d) Any standard or other requirement under Sec. 7412 of the FCAA, including any requirement 

concerning accident prevention under Sec. 7412(r)(7), but excluding the contents of any risk 

management plan required under Sec. 7412(r); 

(e) Any standard or other requirement of the acid rain program under Title IV of the FCAA or 

regulations promulgated thereunder; 

(f) Any requirements established pursuant to Sec. 7661c(b) or Sec. 7414(a)(3) of the FCAA; 

(g) Any standard or other requirement governing solid waste incineration, under Sec. 7429 of the 

FCAA; 
OP1626-07 B-2 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

(h) Any standard or other requirement for consumer and commercial products, under Sec. 

7511b(e) of the FCAA; 

(i) Any standard or other requirement for tank vessels, under Sec. 7511b(f) of the FCAA; 

(j) Any standard or other requirement of the regulations promulgated to protect stratospheric 

ozone under Title VI of the FCAA, unless the administrator determines that such 

requirements need not be contained in an air quality operating permit; 

(k) Any national ambient air quality standard or increment or visibility requirement under part C 

of Title I of the FCAA, but only as it would apply to temporary sources permitted pursuant to 

Sec. 7661c(e) of the FCAA; or 

(l) Any federally enforceable term or condition of any air quality open burning permit issued by 

the Department under Subchapter 6. 

"Department" means the Montana Department of Environmental Quality. 

"Emissions unit" means any part or activity of a stationary source that emits or has the potential to emit 

any regulated air pollutant or any pollutant listed under Sec. 7412(b) of the FCAA. This term is not 

meant to alter or affect the definition of the term "unit" for purposes of Title IV of the FCAA. 

"FCAA" means the Federal Clean Air Act, as amended. 

"Federally enforceable" means all limitations and conditions which are enforceable by the 

administrator, including those requirements developed pursuant to 40 CFR Parts 60 and 61, requirements 

within the Montana state implementation plan, and any permit requirement established pursuant to 40 

CFR 52.21 or under regulations approved pursuant to 40 CFR Part 51, Subpart I, including operating 

permits issued under an EPA approved program that is incorporated into the Montana state 

implementation plan and expressly requires adherence to any permit issued under such program. 

"Fugitive emissions" means those emissions that could not reasonably pass through a stack, chimney, 

vent, or other functionally equivalent opening. 

"General air quality operating permit" or "general permit" means an air quality operating permit that 

meets the requirements of ARM 17.8.1222, covers multiple sources in a source category, and is issued in 

lieu of individual permits being issued to each source. 

"Hazardous air pollutant" means any air pollutant listed as a hazardous air pollutant pursuant to Sec. 

112(b) of the FCAA. 

"Non-federally enforceable requirement" means the following as they apply to emission units in a 

source requiring an air quality operating permit: 

(a) Any standard, rule, or other requirement, including any requirement contained in a consent 

decree, or judicial or administrative order entered into or issued by the Department, that is not 

contained in the Montana state implementation plan approved or promulgated by the 

administrator through rule making under Title I of the FCAA; 

(b) Any term, condition or other requirement contained in any Montana Air Quality Permit 

issued by the Department under Subchapters 7, 8, 9 and 10 of this chapter that is not federally 

enforceable; 
OP1626-07 B-3 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

(c) Does not include any Montana ambient air quality standard contained in Subchapter 2 of this 

chapter. 

"Permittee" means the owner or operator of any source subject to the permitting requirements of this 

subchapter, as provided in ARM 17.8.1204, that holds a valid air quality operating permit or has 

submitted a timely and complete permit application for issuance, renewal, amendment, or modification 

pursuant to this subchapter. 

"Regulated air pollutant" means the following: 

(a) nitrogen oxides or any volatile organic compounds; 

(b) any pollutant for which a national ambient air quality standard has been promulgated; 

(c) any pollutant that is subject to any standard promulgated under Sec. 7411 of the FCAA; 

(d) any Class I or II substance subject to a standard promulgated under or established by Title VI 

of the FCAA; or 

(e) any pollutant subject to a standard or other requirement established or promulgated under 

Sec. 7412 of the FCAA, including but not limited to the following: 

(i) Any pollutant subject to requirements under Sec. 7412(j) of the FCAA. If the 

administrator fails to promulgate a standard by the date established in Sec. 7412(e) of the 

FCAA, any pollutant for which a subject source would be major shall be considered to be 

regulated on the date 18 months after the applicable date established in Sec. 7412(e) of 

the FCAA; 

(ii) Any pollutant for which the requirements of Sec. 7412(g)(2) of the FCAA have been met 

but only with respect to the individual source subject to Sec. 7412(g)(2) requirement. 

"Responsible official" means one of the following: 

(a) For a corporation: a president, secretary, treasurer, or vice-president of the corporation in 

charge of a principal business function, or any other person who performs similar policy or 

decision-making functions for the corporation, or a duly authorized representative of such 

person if the representative is responsible for the overall operation of one or more 

manufacturing, production, or operating facilities applying for or subject to a permit and 

either: 

(i) The facilities employ more than 250 persons or have gross annual sales or expenditures 

exceeding $25 million (in second quarter 1980 dollars); or 

(ii) The delegation of authority to such representative is approved in advance by the 

Department. 

(b) For a partnership or sole proprietorship: a general partner or the proprietor, respectively. 

(c) For a municipality, state, federal, or other public agency: either a principal executive officer 

or ranking elected official. For the purposes of this part, a principal executive officer of a 

federal agency includes the chief executive officer having responsibility for the overall 

operations of a principal geographic unit of the agency (e.g., a regional administrator of the 

environmental protection agency). 
OP1626-07 B-4 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

(d) For affected sources: the designated representative in so far as actions, standards, 

requirements, or prohibitions under Title IV of the FCAA or the regulations promulgated 

thereunder are concerned, and the designated representative for any other purposes under this 

subchapter. 
OP1626-07 B-5 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Abbreviations:

ARM Administrative Rules of Montana 

ASTM American Society of Testing Materials 

BACT Best Available Control Technology 

BDT bone dry tons 

BTU British Thermal Unit 

CFR Code of Federal Regulations 

CO carbon monoxide 

DEQ Department of Environmental Quality 

dscf dry standard cubic foot 

dscfm dry standard cubic foot per minute 

EEAP Emergency Episode Action Plan 

EPA U.S. Environmental Protection Agency 

EPA Method Test methods contained in 40 CFR 60, Appendix A 

EU emissions unit 

FCAA Federal Clean Air Act 

gr grains 

HAP hazardous air pollutant 

IEU insignificant emissions unit 

Mbdft thousand board feet 

Method 5 40 CFR 60, Appendix A, Method 5 

Method 9 40 CFR 60, Appendix A, Method 9 

MMbdft million board feet 

MMBTU million British Thermal Units 

NOx oxides of nitrogen 

NO2 nitrogen dioxide 

O2 oxygen 

Pb lead 

PM particulate matter 

PM10 particulate matter less than 10 microns in size 

psi pounds per square inch 

scf standard cubic feet 

SIC Source Industrial Classification 

SO2 sulfur dioxide 

SOx oxides of sulfur 

tpy tons per year 

U.S.C. United States Code 

VE visible emissions 

VOC volatile organic compound 
OP1626-07 C-1 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Appendix C NOTIFICATION ADDRESSES 

Compliance Notifications: 

Montana Department of Environmental Quality 

Permitting and Compliance Division 

Air Resources Management Bureau 

P.O. Box 200901 

Helena, MT 59620-0901 

United States EPA 

Air Program Coordinator 

Region VIII, Montana Office 

10 W. 15th Street, Suite 3200 

Helena, MT 59626 

Permit Modifications: 

Montana Department of Environmental Quality 

Permitting and Compliance Division 

Air Resources Management Bureau 

P.O. Box 200901 

Helena, MT 59620-0901 

Office of Partnerships and Regulatory Assistance 

Air and Radiation Program 

US EPA Region VIII 8P-AR 

1595 Wynkoop Street 

Denver, CO 80202 
OP1626-07 D-1 Date of Decision: 10/16/09 

Effective Date: 11/17/09 

Appendix D AIR QUALITY INSPECTOR INFORMATION 

Disclaimer: The information in this appendix is not State or federally enforceable, but is presented to 

assist Devon, permitting authority, inspectors, and the public. 

1. Direction to Plant: The facility is located approximately 22 miles southeast of Havre, Montana. The 

location is rural and the site is bounded on three sides by gently rolling range land. The fourth side is 

bounded by a county road. There are no near-by residences, parks, schools, hospitals, etc. 

2. Safety Equipment Required: Hard hat, steel-toed shoes/boots, and hearing protection (ear plugs will 

be provided by Devon) are required at the facility. A detailed safety manual is available at the site 

and a Devon employee will conduct a safety briefing for any inspector prior to entering the plant area. 

3. Facility Plot Plan: The facility plot plan was submitted as part of the original Title V permit 

application on May 30, 1996, as well as the permit renewal application submitted on August 20, 

2003.