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 enclo sed 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. Pl ease 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 Dora n, 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, MTSTATE 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 Progr am, 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: 11/17/09OP1626-07 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. F ACILITY -W IDE ....................................................................................................................3

B. EU001 AND EU002: 5,500- BHP I NGERSOLL R AND KVR 616 C OMPRESSOR E NGINES ........7 C. EU003, EU004, AND EU005: 1,140- BHP C ATERPILLAR G3516 TALE C OMPRESSOR

E NGINES

............................................................................................................................... .9

D. EU006: 60 MMS CFD ( DRY GAS ) A LCO D EHYDRATION U NIT AND 50 MMS CFD ( DRY GAS )

PAMCO D EHYDRATION U NIT ............................................................................................13

E. EU007: 297 BHP W AUKESHA L1616 E MERGENCY E NGINE /G ENERATOR

, AND .................14

EU008: 770 BHP C UMMINS GTA28 E MERGENCY E NGINE /G ENERATOR ...........................14

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

A. F ACILITY -W IDE ..................................................................................................................16

B. E MISSIONS U NIT .................................................................................................................17

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

A. C OMPLIANCE R EQUIREMENTS ............................................................................................18

B. C ERTIFICATION R EQUIREMENTS ........................................................................................18

C. P ERMIT S HIELD ...................................................................................................................19

D. M ONITORING

, R ECORDKEEPING

, AND R EPORTING R EQUIREMENTS ..................................20

E. P ROMPT D EVIATION R EPORTING ........................................................................................21

F. E MERGENCY P ROVISIONS ...................................................................................................21

G. I NSPECTION AND E NTRY .....................................................................................................22

H. F EE P AYMENT .....................................................................................................................22

I. M INOR P ERMIT M ODIFICATIONS ........................................................................................23

J. C HANGES N OT R EQUIRING P ERMIT R EVISION ...................................................................23

K. S IGNIFICANT P ERMIT M ODIFICATIONS ...............................................................................24

L. R EOPENING FOR C AUSE ......................................................................................................24

M. P ERMIT E XPIRATION AND R ENEWAL ..................................................................................25

N. S EVERABILITY C LAUSE ......................................................................................................25

O. T RANSFER OR A SSIGNMENT OF O WNERSHIP ......................................................................26

P. E MISSIONS T RADING

, M ARKETABLE P ERMITS

, E CONOMIC I NCENTIVES ...........................26 Q. N O P ROPERTY R IGHTS C ONVEYED .....................................................................................26

R. T ESTING R EQUIREMENTS ....................................................................................................26

S. S OURCE T ESTING P ROTOCOL .............................................................................................26

T. M ALFUNCTIONS ..................................................................................................................26

U. C IRCUMVENTION ................................................................................................................26

V. M OTOR V EHICLES ..............................................................................................................26

W. A NNUAL E MISSIONS I NVENTORY .......................................................................................27

X. O PEN B URNING ...................................................................................................................27

Y. M ONTANA A IR Q UALITY P ERMITS .....................................................................................27

Z. N ATIONAL E MISSION S TANDARD FOR A SBESTOS ..............................................................28

AA. A SBESTOS ...........................................................................................................................28

BB. S TRATOSPHERIC O ZONE P ROTECTION

– S ERVICING OF M OTOR V EHICLE A IR
C ONDITIONERS ...................................................................................................................28

CC. S TRATOSPHERIC O ZONE P ROTECTION

– R ECYCLING AND E MISSION R EDUCTIONS ..........28

DD. E MERGENCY E PISODE P LAN ...............................................................................................29

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

Effective Date: 11/17/09 APPENDIX A INSIGNIFICANT EMI SSIONS UNIT .......................................................................A-1

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

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

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

Effective Date: 11/17/09 Terms not otherwise defined in this permit or in the Definitions and Abbrev iations 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 Ca rter 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 pr essure in the natural gas transmission system. Gas gathering and gas compression is accomplished using th e 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 Emerge ncy Engine/Generator NoneOP1626-07 3 Date of Decision: 10/16/09

Effective Date: 11/17/09 SECTION III. PERMIT CONDITIONS

The following requirements and conditions are applicab le 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 Require ments 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 NO 2 --------

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

A.4 ARM 17.8.304(2) Visible Ai r 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 Particul ate 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 * P 0.67

or
E= 55 * P 0.11 - 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 NESHAP s General Provisions Startup, Shutdown, and Malfunction (SSM) Plans -------

A.16 ARM 17.8.1212 Re porting Requirements Prompt Deviation Reporting -------

A.17 ARM 17.8.1212 Reporting Require ments Compliance Monitoring

-------

A.18 ARM 17.8.1207 Reporting Require ments 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, complia nce with limits and conditions listing “as required by the Department” as the frequency, is verified annually using emission factors and engineeringOP1626-07 4 Date of Decision: 10/16/09

Effective Date: 11/17/09 calculations by the Department’s compliance in spectors 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 NO 2 . This fence shall be constructed in a manner adequate to restrict the general public from the premises, and Devon sha ll 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 con secutive 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 af ter 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 operat e a construction site or demolition project unless reasonable precautions are taken to control emi ssions 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 th e 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 equi pment and new fuel burning equipment calculated using the following equations:

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

E =0.882 * H -0.1664

For new fuel burning equipment (insta lled 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 disch arged 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 * P 0.67
For process weight rates in excess of 30 tons per hour: E = 55.0 * P 0.11 – 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 otherwi se 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 AR M 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, reser voir or other container of more than 65,000 gallon capacity any crude oil, gasoline or petroleum di stillate having a vapor pr essure 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 worki ng 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-com partment 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, cons tructed 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 Emissi on Standards for Hazardous Air Pollutants (NESHAP) or Maximum Achievable Control Techno logy (MACT) standard, and within 30 days of the revision of any such SSM plan, when a pplicable. The Department requests submittal of such plans in electronic form, when possible.

A.16. Devon shall promptly report deviations from perm it 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 inform ation 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 be lief 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 certifica tion required by Section V.B must include a statement of compliance based on the informa tion available which identifies any observed, documented, or otherwise known instance of noncom pliance for each applicable requirement. Per ARM 17.8.1207,

any application form, report, or comp liance certification submitted pursuant to ARM Title 17, Chapter 8, Subchapter 12 (including annual certifications), shall contain certification by a responsib le 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, a nd 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, resu lting 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) othe r 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 (NO x) 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 analy zer 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 sulfid e at standard conditions (ARM 17.8.322(5)).

C.4. Each 1,140 bhp Caterpillar natural gas compressor en gine shall be equipped with a “low emission” package and shall be operated as a lean-bur n 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 Cate rpillar natural gas compressor engines shall be a minimum of 20 feet above ground le vel (ARM 17.8.749 and 17.8.752).

C.8. NO

x emissions from each of the 1,140 bhp Caterp illar 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 Caterp illar 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 Caterp illar 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 requi rements (Sections III.C.1, III.C.2, III.C.3 and III.C.10) may be satisfied by burning pipeline qua lity 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-bur n 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 maintena nce 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 sp eed 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 por table analyzer in order to monitor the NO

x 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 adva nce 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 NO

x 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 rat es shall be determined us ing 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 in stance 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, a nd operator’s initials (ARM 17.8.1212).

C.17. Devon shall maintain records as required by Sectio n 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, resu lting 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 s ubmitted 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) othe r 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 standard s, 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 Subpa rt HHH (ARM 17.8.340 and 40 CFR 63, Subpart A and Subpart HHH).

Recordkeeping

D.5. Devon shall maintain a record documenting any in stance in which a fuel other than pipeline quality natural gas was used in any of the dehydr ation units to monitor compliance with Section III.D.3. The log shall include date, time, durati on of alternate fuel use, and operator’s initials (ARM 17.8.1212).

D.6. Devon shall maintain records required by 40 CF R 63, Subpart A and Subpart HHH according to the provisions of 40 CFR 63, Subpart A a nd 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 th e 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 Emerg ency Engine/Generator, and EU008: 770 bhp Cummins GTA28 Em ergency 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 th e 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 sulfid e at standard conditions (ARM 17.8.322(5)).

E.4. Devon shall operate the 297 bhp Waukesha L1616 em ergency 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 Ai r Pollutants for Stationary Reciprocating Internal Combustion Engines (ARM 17.8.34 2 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, an d 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 operati ng 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 ope rator’s initials (ARM 17.8.1213).

E.8. Devon must meet the initial notification requi rements 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 in stance 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, ti me, 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 requir ed 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) (includi ng 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 durin g 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) a nd Federal Regulations identified as not applicable to the facility or to a specific emissions unit at th e time of the permit issuance are listed below (ARM 17.8.1214). The following list does not preclude the n eed to comply with any new requirements that may become applicable during the permit term.

A. Facility-Wide

The following table contains non-applicable requireme nts, 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 requireme nts: non-applicable requirements for individual or specific emission units were not listed. The Depart ment 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 pe rmit modification, revocation and reissuance, or termination, or of a notification of planned ch anges 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 impa cts of continuing operations, and that such health, safety or environmental impacts were unf oreseeable and could not have otherwise been

avoided.

4. The permittee shall furnish to the Department, w ithin 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 sh all be supplemental to, and shall not sanction noncompliance with, the applicable requirements on which it was based.

6. For applicable requirements that will become e ffective 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 Pe rmit Program §1207 a nd §1213(7)(a)&(c)-(d)

1. Any application form, report, or compliance cer tification 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 require d under ARM Title 17, Chapter 8, Subchapter 12, shall state that, based on information and belief formed after reasonable inquiry, the statements and inform ation 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 th e 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 a nd 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 liste d in the Notification Addresses Appendix of this permit.

C. Permit Shield ARM 17.8, Subchapter 12, Oper ating 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 re quirements and any non-federally enforceable requirements as of the date of permit issuance.

2. The permit shield described in 1 above shall rema in in effect during the appeal of any permit action (renewal, revision, reopening, or re vocation 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 in formation from a source pursuant to Sec. 7414 of the FCAA;

e. The ability of the Department to obtain info rmation from a source pursuant to the Montana Clean Air Act, Title 75, Chapter 2, MCA;

f. The emergency powers of the Department un der the Montana Clean Air Act, Title 75, Chapter 2, MCA; andOP1626-07 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 define d 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 s ubmitting 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 sha ll then be presumed to be in compliance or noncompliance unless that presumption is overcom e by other relevant credible evidence.

6. The permit shield will not extend to minor perm it modifications or changes not requiring a permit revision (see Sections I & J).

7. The permit shield will extend to significant perm it modifications and transfer or assignment of ownership (see Sections K & O).

D. Monitoring, Recordkeeping, and Reporting Requirements ARM 17.8, Subchapter 12, Oper ating 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 require d monitoring data and s upport information for a period of at least 5 years from the date of the monitoring sample, measurement, report, or application. Support information includes a ll 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 mainta ined 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 othe rwise 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 Ja nuary 1 through June 30 of the current year. All instances of deviations from the permit requi rements 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, Oper ating 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 pr obable cause of such deviations, and any corrective actions or preventive measures taken. To be consid ered 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 elect ronic notification) describing the incident within 24 hours (or the next business day) of discovery; and,

b. A follow-up written, faxed, or electronic report w ithin 30 days of discovery of the deviation that describes the probable cause of the repor ted 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, deviati ons shall be reported to the Depa rtment 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 resu bmitted 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 Perm it 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 emergenc y 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 pe rmittee demonstrates through properly signed, contemporaneous logs, or othe r 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 ex ceeded 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 mitiga te 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, Oper ating 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 admini strator, 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 record s 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, em ission 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, Opera ting 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 anyOP1626-07 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 an y required portion of an appealed fee) within 90 days of the due date of the fee, the Depart ment may impose an additional assessment of 15% of the fee (or any required portion of an appeal ed 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, Opera ting 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, updatin g, supplementation, or deletion, and may reference any required in formation 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 w ithin 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 cha nges 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 term s that are necessary to enforce applicable

emission limitations on emission un its 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 app licable 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 wr itten 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, Operati ng 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. Signi ficant 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 pe rmit monitoring terms or conditions;

c. Every relaxation of permit reporting or recor dkeeping 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 require ments of ARM Title 17, Chapter 8, including those for applications, public participation, and re view by affected states and the administrator, as they apply to permit issuance and renewal, excep t that an application for a significant permit modification need only address in detail those porti ons of the permit application that require revision, updating, supplementation or deletion.

3. The permit shield provided for in ARM 17.8.1 214 shall extend to significant modifications.

L. Reopening for Cause ARM 17.8, Subchapter 12, Oper ating Permit Program §1228(1)&(2)

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

a. Additional applicable requirements under the FC AA 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 AR M 17.8.1228(1)(a) if the effective date ofOP1626-07 25 Date of Decision: 10/16/09

Effective Date: 11/17/09 the applicable requirement is later than the da te on which the permit is due to expire, unless the original permit or any of its terms or conditions have been ex tended 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 determin es 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 Pr ogram §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 applicati on 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 pe rmit renewal has been issued or denied.

4. For renewal, the permittee shall submit a comple te 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 wr iting 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, Opera ting 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 sha ll not impair in any manner the underlying applicability of all applicable requirements, a nd 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 i nvalid, 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, Oper ating 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 responsib ility, 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, Op erating Permit Program §1226(2)

Notwithstanding ARM 17.8.1226(1) and (7), mi nor air quality operating permit modification procedures may be used for permit modificati ons involving the use of economic incentives, marketable permits, emissions trading, and other si milar approaches, to the extent that such minor permit modification procedures are explicitly provide d 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, Oper ating 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 A pplication, 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 emi ssion 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 a nd 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, inst all, 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 AR M 17.8.743, 744, 745, 748, and 764.

3. ARM 17.8.745(1) specifies de minimis chang es as construction or changed conditions of operation at a facility holding an air quality pr econstruction 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 approv ed 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 c ondition of operation that would affect the plume rise or dispersion characteristic of emissions that w ould 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 sma ller projects to avoid Montana Air Quality Permitting; or

e. Emission reductions obtained th rough offsetting within a facility are not included when determining the potential emission increase fro m construction or ch anged 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 anOP1626-07 28 Date of Decision: 10/16/09

Effective Date: 11/17/09 increase in source capacity above its permitted opera tion 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 prac ticable 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 abat ement 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 – Servic ing 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, re pair or disposal of appliances must comply with the standards for recycling and r ecovery 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, M VACs and MVAC-like (as defined at §82.152) appliances must comply with recordkeep ing requirements pursuant to §82.166;

5. Persons owning commercial or industrial process re frigeration 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 adde d 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 c ontained 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 Em ergency Episode Action Plan (EEAP) that details how the source will curtail emissions during an ai r 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 Abbrev iations 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 Stat e 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 He ating 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/H eat 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) Correc ts typographical errors;

(b) Identifies a change in the name, address or pho ne 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 requi rements 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 qua lity 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 requi rements 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 entere d into or issued by the Department, that is contained in the Montana state implementa tion plan approved or promulgated by the administrator through rule making under Title I of the FCAA;

(b) Any federally enforceable term, condition or ot her 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 pr omulgated through rule maki ng 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 soli d 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 c onsumer and commercial products, under Sec. 7511b(e) of the FCAA;

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

(j) Any standard or other requirement of the regul ations 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 in crement or visibility requirement under part C of Title I of the FCAA, but only as it would ap ply 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 te rm "unit" for purposes of Title IV of the FCAA.

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

"Federally enforceable" means all limitations and conditi ons 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 th at is incorporated into the Montana state implementation plan and expressly requires adhere nce to any permit issued under such program.

"Fugitive emissions" means those emissions that could not reasonably pass through a stack, chimney, vent, or other functionall y 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 multip le 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 implementa tion plan approved or promulgated by the administrator through rule making under Title I of the FCAA;

(b) Any term, condition or other requirement c ontained 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 st andard contained in Subchapter 2 of this chapter.

"Permittee" means the owner or operator of any source s ubject to the permitting requirements of this subchapter, as provided in ARM 17.8.1204, that hol ds a valid air quality operating permit or has submitted a timely and complete perm it 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 ai r 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 othe r 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 app licable 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 a ny 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 re presentative is approved in advance by the Department.

(b) For a partnership or sole proprietorship: a ge neral partner or the proprietor, respectively.

(c) For a municipality, state, federal, or other pub lic agency: either a pr incipal 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

NO 2 nitrogen dioxide

O 2 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

SO 2 sulfur dioxide

SOx oxides of sulfur

tpy tons per year U.S.C. United States Code

VE visible emissions VOC volatile organic compoundOP1626-07 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. 15 th 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 80202OP1626-07 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. Directi on 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 applicati on submitted on August 20,

2003.