December 29, 2009 

Owen Orndorff 

Colstrip Energy Limited Partnership 

1087 West River Street, Suite 200 

Boise, ID 83702 

RE: Final Title V Operating Permit #OP2035-02 

Dear Mr. Orndorff: 

The Department of Environmental Quality has prepared the enclosed Final Operating Permit #OP2035-

02, for Colstrip Energy Limited Partnership, located in North 1/2, Section 32, Township 3 North, Range 

41 East in Rosebud County, Montana. Please review the cover page of the attached permit for 

information pertaining to the action taking place on Permit #OP2035-02. 

If you have any questions, please contact Debbie Skibicki, the lead permit engineer, at (406) 444-1472 or 

by email at dskibicki@mt.gov. 

Sincerely, 

Vickie Walsh 

Air Permitting Program Supervisor 

Air Resources Management Bureau 

(406) 444-9741 

 Trista Glazier 

 Air Quality Specialist 

 Air Resources Management Bureau 

 (406) 444-3403 

VW:TG: lr 

Enclosure 

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

 Betsy Burns, US EPA Region VIII, Montana Office 

 
STATE OF MONTANA 

Department of Environmental Quality 

Helena, Montana 59620 

AIR QUALITY OPERATING PERMIT OP2035-02 

 

Issued to: Colstrip Energy Limited Partnership 

1/2, Section 32, Township 3 North, Range 41 East 

in Rosebud County, Montana 

 1087 West River Street, Suite 200 

Boise, ID 83702 

Final Date: December 25, 2009 

Expiration Date: January 24, 2014 

Effective Date: December 25, 2009

Date of Decision: November 24, 2009 

End of EPA 45-day Review: November 23, 2009

Proposed Issue Date: October 7, 2009

Draft Issue Date: September 4, 2009

 

Application Deemed Technically Complete: March 31, 2009

Application Deemed Administratively Complete: March 31, 2009

Significant Modification Application Received: December 30, 2008

AFS Number: 030-087-0007A

Permit Issuance and Appeal Processes: In accordance with Montana Code Annotated (MCA) Sections 

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

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

Environmental Quality (Department) as effective and final on December 25, 2009. The permit must be 

kept on-site at the above named facility. 

OP2035-02 i Date of Decision: 11/24/09 

Effective Date: 12/25/09
OP2035-02 ii Date of Decision: 11/24/09 

Effective Date: 12/25/09

Montana Air Quality Operating Permit 

Department of Environmental Quality 

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

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

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

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

B. EU001 – TRUCK TRANSPORT OF COAL ................................................................................6 

C. EU002 – TRUCK UNLOADING OF COAL; EU003 – COAL CRUSHING AND TRANSPORT; EU004 –

COAL BUNKER BIN VENTS.....................................................................................7 

D. EU005 – LIMESTONE UNLOADING, HANDLING, AND STORAGE...........................................9 

E. EU006 – CIRCULATING FLUIDIZED BED BOILER ...............................................................10 

F. EU007 – FLYASH CONVEYING AND STORAGE; EU008 – BEDASH CONVEYING AND STORAGE;

EU009 – ASH STORAGE SILO UNLOADING..........................................................16 

G. EU010 - ASH TRUCK UNLOADING......................................................................................18 

H. EU011 – FUGITIVE EMISSIONS: ASH DISPOSAL AREA ......................................................19 

I. EU012 – FUGITIVE EMISSIONS: VEHICLE TRAFFIC ............................................................21 

SECTION IV. NON-APPLICABLE REQUIREMENTS ................................................................23

A. FACILITY-WIDE ..................................................................................................................23 

B. EMISSION UNITS .................................................................................................................24 

SECTION V. GENERAL PERMIT CONDITIONS.......................................................................25

A. COMPLIANCE REQUIREMENTS............................................................................................25 

B. CERTIFICATION REQUIREMENTS ........................................................................................25 

C. PERMIT SHIELD...................................................................................................................26 

D. MONITORING, RECORDKEEPING, AND REPORTING REQUIREMENTS..................................27 

E. PROMPT DEVIATION REPORTING........................................................................................28 

F. EMERGENCY PROVISIONS...................................................................................................28 

G. INSPECTION AND ENTRY.....................................................................................................29 

H. FEE PAYMENT.....................................................................................................................29 

I. MINOR PERMIT MODIFICATIONS ........................................................................................29 

J. CHANGES NOT REQUIRING PERMIT REVISION ...................................................................30 

K. SIGNIFICANT PERMIT MODIFICATIONS...............................................................................31 

L. REOPENING FOR CAUSE......................................................................................................31 

M. PERMIT EXPIRATION AND RENEWAL..................................................................................31 

N. SEVERABILITY CLAUSE ......................................................................................................32 

O. TRANSFER OR ASSIGNMENT OF OWNERSHIP......................................................................32 

P. EMISSIONS TRADING, MARKETABLE PERMITS, ECONOMIC INCENTIVES...........................32 

Q. NO PROPERTY RIGHTS CONVEYED.....................................................................................32 

R. TESTING REQUIREMENTS....................................................................................................33 

S. SOURCE TESTING PROTOCOL .............................................................................................33 

T. MALFUNCTIONS..................................................................................................................33 

U. CIRCUMVENTION ................................................................................................................33 

V. MOTOR VEHICLES ..............................................................................................................33 

W. ANNUAL EMISSIONS INVENTORY .......................................................................................33 

X. OPEN BURNING...................................................................................................................33 

Y. MONTANA AIR QUALITY PERMITS.....................................................................................33 

Z. NATIONAL EMISSION STANDARD FOR ASBESTOS ..............................................................34 
OP2035-02 iii Date of Decision: 11/24/09 

Effective Date: 12/25/09

AA. ASBESTOS ...........................................................................................................................34 

BB. STRATOSPHERIC OZONE PROTECTION – SERVICING OF MOTOR VEHICLE AIR CONDITIONERS

.............................................................................................................................34

CC. STRATOSPHERIC OZONE PROTECTION – RECYCLING AND EMISSION REDUCTIONS ..........35 

DD. EMERGENCY EPISODE PLAN...............................................................................................35 

EE. DEFINITIONS .......................................................................................................................35 

APPENDIX A INSIGNIFICANT EMISSION UNITS...................................................................A-1

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

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

APPENDIX D AIR QUALITY INSPECTOR INFORMATION ..................................................D-1

APPENDIX E CONTINUOUS EMISSION MONITORING SYSTEMS (CEMS)..................... E-1

APPENDIX F CAM PLAN – CIRCULATING FLUIDIZED BED BOILER, PARTICULATE 

MATTER CONTROL............................................................................................. F-1

APPENDIX G CAM PLAN – CIRCULATING FLUIDIZED BED BOILER, SULFUR 

DIOXIDE CONTROL.............................................................................................G-1

APPENDIX H MEMS........................................................................................................................H-1
OP2035-02 1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

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

SECTION I. GENERAL INFORMATION 

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

Company Name: Colstrip Energy Limited Partnership (CELP) 

Mailing Address: 1087 West River Street, Suite 200 

City: Boise State: Idaho Zip: 83702 

Plant Location: Six miles north of Colstrip on Highway 39 

Responsible Official: Owen Orndorff, Vice President General Counsel Phone: (208)344-3570 

Facility Contact Person: Scott Siddoway Phone: (208)344-3570 

Primary SIC Code: 49 

Nature of Business: Electric Energy Generation 

Description of Process: 

The Rosebud Power Plant is an electric generating facility designed to burn low-British thermal unit (Btu) 

waste coal from mining operations east of Billings, Montana. The facility uses a circulating fluidized bed 

(CFB) boiler. The CFB boiler is designed to efficiently utilize low-Btu coal while also allowing a high 

recovery of fuel sulfur through the injection of limestone into the fluidized bed. 

Coal is delivered to this facility using covered trucks and trailers. The facility does not have means for 

coal storage beyond the truck hopper (80 ton capacity), and the boiler coal bunkers (1700 ton capacity). 

The coal is crushed in primary and secondary crushers, then conveyed directly to the boiler house coal 

bunker. The crushed coal is metered to the fluidized portion of the boiler using gravimetric feeders. 

Limestone is delivered to this facility in trucks and trailers and is unloaded pneumatically into a 820 ton 

silo. From the silo, limestone is metered to the boiler using gravimetric feeders and a pressure pneumatic 

conveying system. In the boiler, the coal is burned at relatively low temperatures to minimize nitrogen 

oxides (NOx) formation. Limestone fed to the boiler acts as a reactant for removing sulfur dioxide. 

Ash from the boiler is discharged as either bedash or flyash. Both types of ash are collected in separate 

systems and conveyed pneumatically to a common ash silo. The combined ash is unloaded periodically 

into a plant ash truck and transported to an on-site disposal area. 
OP2035-02 2 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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 Truck Transport of Coal Reasonable Precautions and Covered Haul 

Trucks 

EU002 Truck Unloading of Coal Baghouse 

EU003 Coal Crushing and Transport Baghouse 

EU004 Coal Bunker Bin Vents Baghouses 

EU005 Limestone Unloading, Handling, and Storage Fabric Filter Baghouse and Cartridge Filter 

EU006 Circulating Fluidized Bed Boiler Baghouse 

EU007 Flyash Conveying and Storage Baghouse 

EU008 Bedash Conveying and Storage Baghouse 

EU009 Ash Storage Silo Unloading Baghouse 

EU010 Ash Truck Unloading Water Spray 

EU011 Fugitive Emissions: Ash Disposal Area Water Spray 

EU012 Fugitive Emissions: Vehicle Traffic Paving or chemical dust suppression or 

water spray as backup 
OP2035-02 3 Date of Decision: 11/24/09 

Effective Date: 12/25/09

SECTION III. PERMIT CONDITIONS 

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

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

A. Facility-Wide 

Conditions Rule Citation Rule Description Pollutant/Parameter Limit 

A.1 ARM 

17.8.105 

Testing Requirements Testing Requirements ------- 

A.2 ARM 

17.8.304(1) 

Visible Air Contaminants Opacity 40% 

A.3 ARM 

17.8.304(2) 

Visible Air Contaminants Opacity 20% 

A.4 ARM 

17.8.308(1) 

Particulate Matter, 

Airborne 

Fugitive Opacity 20% 

A.5 ARM 

17.8.308(2) 

Particulate Matter, 

Airborne 

Reasonable 

Precautions 

------- 

A.6 ARM 

17.8.308 

Particulate Matter, 

Airborne 

Reasonable 

Precaution, 

Construction 

20% 

A.7 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.8 ARM 

17.8.310 

Particulate Matter, 

Industrial Processes 

Particulate Matter E= 4.10 * P0.67 or 

E= 55 * P0.11- 40 

A.9 ARM 

17.8.322(4) 

Sulfur Oxide Emissions, 

Sulfur in Fuel 

Sulfur in Fuel (liquid 

or solid fuels) 

1 lb/MMBtu fired 

A.10 ARM 

17.8.322(5) 

Sulfur Oxide Emissions, 

Sulfur in Fuel 

Sulfur in Fuel 

(gaseous) 

50 gr/100 CF 

A.11 ARM 

17.8.324(3) 

Hydrocarbon Emissions, 

Petroleum Products 

Gasoline Storage 

Tanks 

------- 

A.12 ARM 

17.8.324 

Hydrocarbon Emissions, 

Petroleum Products 

65,000 Gallon 

Capacity 

------- 

A.13 ARM 

17.8.324 

Hydrocarbon Emissions, 

Petroleum Products 

Oil-effluent Water 

Separator 

------- 

A.14 ARM 

17.8.342 

NESHAPs General 

Provisions 

SSM Plans Submittal 

A.15 ARM 

17.8.1212 

Reporting Requirements Compliance 

Monitoring 

------- 

A.16 ARM 

17.8.1207 

Reporting Requirements Annual Certification ------- 

Conditions

A.1. Pursuant to ARM 17.8.105, any person or persons responsible for the emission 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 test, emission or ambient, for such periods of time as may be necessary using methods 

approved by the Department. 
OP2035-02 4 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

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

by the Department” as the frequency, is verified annually using emission factors and engineering 

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

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

compliance inspector. 

A.2. Pursuant to ARM 17.8.304(1), CELP shall not cause or authorize emissions to be discharged into 

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

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

or in this permit. 

A.3. Pursuant to ARM 17.8.304(2), CELP shall not cause or authorize emissions to be discharged into 

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

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

this permit. 

A.4. Pursuant to ARM 17.8.308(1), CELP 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.5. Pursuant to ARM 17.8.308(2), CELP 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.6. Pursuant to ARM 17.8.308, CELP shall not operate a construction site or demolition project unless 

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

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

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

permit. 

A.7. Pursuant to ARM 17.8.309, unless otherwise specified by rule or in this permit, CELP shall not 

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

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

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

using the following equations: 

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

E =0.882 * H-0.1664

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

E =1.026 * H-0.233

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

allowable particulate emissions rate in pounds per MMBtu. 

A.8. Pursuant to ARM 17.8.310, unless otherwise specified by rule or in this permit, CELP shall not 

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

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

matter calculated using the following equations: 

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

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

Where E = rate of emissions in pounds per hour and p = process weight rate in tons per hour. 
OP2035-02 5 Date of Decision: 11/24/09 

Effective Date: 12/25/09

A.9. Pursuant to ARM 17.8.322(4), CELP 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.10. Pursuant to ARM 17.8.322(5), CELP shall not burn any gaseous fuel containing sulfur compounds 

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

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

A.11. Pursuant to ARM 17.8.324(3), CELP shall not load or permit the loading of gasoline into any 

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

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

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

or in this permit. 

A.12. Pursuant to ARM 17.8.324, unless otherwise specified by rule or in this permit, CELP shall not 

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

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

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

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

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

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

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

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

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

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

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

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

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

A.14. Pursuant to ARM 17.8.342 and 40 CFR 63.6, CELP shall submit to the Department a copy of any 

startup, shutdown, and malfunction (SSM) plan required under 40 CFR 63.6(e)(3) within 30 days 

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

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

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

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

such plans in electronic form, when possible. 

A.15. On or before February 15 and August 15 of each year, CELP 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, CELP may submit a single 

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

17.8.1207, 

any application form, report, or compliance certification submitted 

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

semiannual monitoring reports), shall contain certification by a 

responsible official of truth, accuracy and completeness. This 

certification and any other certification required under ARM Title 17, 

Chapter 8, Subchapter 12, shall state that, “based on information and 

belief formed after reasonable inquiry, the statements and information 

in the document are true, accurate and complete.” 
OP2035-02 6 Date of Decision: 11/24/09 

Effective Date: 12/25/09

A.16. By February 15 of each year, CELP shall submit to the Department the compliance certification 

report required by Section V.B. The annual certification report required by Section V.B must 

include a statement of compliance based on the information available which identifies any 

observed, documented or otherwise known instance of noncompliance for each applicable 

requirement. Per ARM 17.8.1207, 

any application form, report, or compliance certification submitted 

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

certifications), shall contain certification by a responsible official of 

truth, accuracy and completeness. This certification and any other 

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

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

reasonable inquiry, the statements and information in the document 

are true, accurate and complete.” 

B. EU001 – Truck Transport of Coal 

Condition(s) Pollutant/ Compliance Demonstration 

Parameter 

Permit 

Limit Method Frequency 

Reporting 

Requirements 

B.1, B.3, 

B.4., B.5., 

B.7., B.8. 

Opacity 20% 

B.2., B.3., 

B.4., B.5., 

B.6., B.7., 

B.8. 

Particulate 

Matter 

Reasonable 

Precautions 

Covered haul 

trucks and paving 

or chemical dust 

suppressants and 

water 

Ongoing Semiannual 

Conditions

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

the emitting unit that exhibit opacity of 20% or greater averaged over 6 consecutive minutes 

(ARM 17.8.304(1)). 

B.2. CELP 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 from any stationary source shall not exhibit an opacity of 20% 

or greater averaged over 6 consecutive minutes (ARM 17.8.308(1)). 

Compliance Demonstration

B.3. Coal haul trucks shall be covered during hauling operations (ARM 17.8.749). 

B.4. All haul roads shall use either paving or chemical dust suppression to limit excessive fugitive 

dust, with water as a backup measure to maintain compliance with the limits in Section III.B.1 

and III.B.2 (ARM 17.8.1213). 

Recordkeeping

B.5. CELP shall maintain on site a log documenting compliance with Sections III.B.3 and III.B.4. 

With respect to Section III.B.3, the log shall reflect any time a coal truck enters the plant site 

without a cover. When chemical dust suppression or water are applied to control emissions, a log 

including, but not limited to, the date, time, name of person completing log, a description or the 

area of application, and a description of what material was applied shall be maintained. The log 

shall be available to the Department for inspection and must be submitted to the Department upon 

request. (ARM 17.8.1212).
OP2035-02 7 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Reporting 

B.6. Any compliance source test reports must be submitted in accordance with Montana Source Test 

Protocol and Procedure Manual (ARM 17.8.106). 

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

statement for the above applicable requirements (ARM 17.8.1212). 

B.8. The semiannual monitoring report shall provide a summary of the log required in Section III.B.5 

(ARM 17.8.1212). 

C. EU002 – Truck Unloading of Coal; EU003 – Coal Crushing and Transport; EU004 – Coal 

Bunker Bin Vents 

Condition(s) Pollutant/ Compliance Demonstration 

Parameter 

Permit Limit 

Method Frequency 

Reporting 

Requirements 

Enclosed 

Structure and 

Baghouse 

C.1., C.7., Ongoing Semiannual 

C.8., C.12., 

C.13., C.14., 

C.16., C.17., 

C.18. 

Opacity 20% 

Method 9 As required 

by the 

Department 

and Section 

III.A.1 

Semiannual 

Enclosed 

structures 

and 

baghouses 

C.2., C.3., Ongoing Semiannual 

C.4., C.7., 

C.9., C.12., 

C.13., C.14., 

C.16., C.17., 

C.18. 

PM10 0.005 gr/dscf (EU#2) 

0.006 gr/dscf (EU#3) 

0.01 gr/dscf (EU#4) 

Method 

201A 

As required 

by the 

Department 

and Section 

III.A.1 

Semiannual 

C.5., C.10, 

C.14., C.17., 

C.18. 

Stack Heights 40 feet above the 

ground 

Certification Ongoing Annual 

C.6., C.11., 

C.15., C.17., 

C.18. 

40 CFR 60, 

Subpart Y 

40 CFR 60, Subpart Y 40 CFR 60, 

Subpart Y 

40 CFR 60, 

Subpart Y 

Semiannual 

Conditions

C.1. CELP may not cause or authorize emissions from the Truck Unloading of Coal, the Coal Crushing 

and Transport, and the Coal Bunker Bin Vents to be discharged into the outdoor atmosphere that 

exhibit an opacity of 20% or greater averaged over 6 consecutive minutes (ARM 17.8.304(2)). 

C.2. The unloading of coal shall be in an enclosed structure and controlled by a baghouse. Particulate 

matter less than 10 microns (PM10) emissions from the baghouse shall not exceed 0.005 gr/dscf 

(ARM 17.8.752). 

C.3. The coal crushing, screening, and transfer emissions are to be vented to a baghouse for particulate 

control. PM10 emissions from the baghouse shall not exceed 0.006 gr/dscf (ARM 17.8.752). 
OP2035-02 8 Date of Decision: 11/24/09 

Effective Date: 12/25/09

C.4. The Coal Storage Bunker shall be controlled by two baghouses. Particulate emissions from each 

baghouse shall not exceed 0.01 gr/dscf (ARM 17.8.752). 

C.5. CELP shall maintain the stacks of the coal dump baghouse and the coal crushing baghouse 40 feet 

above the ground (ARM 17.8.749). 

C.6. CELP shall comply with all applicable standards and limitations, and the reporting, recordkeeping, 

and notification requirements contained in 40 CFR 60, Subpart Y (ARM 17.8.340 and 40 CFR 60, 

Subpart Y). 

Compliance Demonstration

C.7. CELP shall use and maintain structural enclosures surrounding process equipment and operate 

baghouses for maintaining compliance with Sections III.C.2, III.C.3, and III.C.4 (ARM 

17.8.1213). 

C.8. As required by the Department and Section III.A.1, CELP shall perform a Method 9 test in 

accordance with the Montana Source Test Protocol and Procedures Manual (ARM 17.8.106 and 

ARM 17.8.1213). 

C.9. As required by the Department and Section III.A.1, CELP shall perform a Method 201A 

(filterable) or other Department approved test to monitor compliance with Sections III.C.2, III.C.3, 

and III.C.4. The test shall be performed in accordance with the Montana Source Test Protocol and 

Procedures Manual (ARM 17.8.106 and ARM 17.8.1213). 

C.10. The stack height requirements for the coal dump baghouse and the coal crushing baghouse as 

specified in Section III.C.5 shall be accomplished through initial certification and normal 

operations maintaining compliance on an ongoing basis (ARM 17.8.1213). 

C.11. Compliance monitoring for the applicable requirements contained in 40 CFR 60, Subpart Y shall 

be accomplished as described in 40 CFR 60, Subpart Y (ARM 17.8.340 and 40 CFR 60, Subpart 

Y). 

Recordkeeping

C.12. All source test recordkeeping shall be performed in accordance with the Montana Source Test 

Protocol and Procedures Manual (ARM 17.8.106). If Method 9 tests are conducted, the test 

reports must be maintained on-site and must be submitted to the Department upon request (ARM 

17.8.1212). 

C.13. CELP shall maintain on site, a log of all corrective actions taken and all repair and maintenance 

activity to the structural enclosures and baghouses. The log shall include, but is not limited to, the 

identification of the enclosure or baghouse, the date of the maintenance and/or corrective action, 

the name(s) of repair personnel, description of the maintenance activity and the item(s) repaired or 

replaced. The log shall be available to the Department for inspection and must be submitted to the 

Department upon request (ARM 17.8.1212). 

C.14. CELP shall maintain on site a coal dump and crushing baghouse log documenting any stack 

specifications that deviate from normal operations as specified in Section III.C.10. At a minimum, 

the coal dumping and crushing baghouse log shall include the required information, the date, and 

the initials of the documenting personnel (ARM 17.8.1212). 

C.15. CELP shall perform recordkeeping in accordance with 40 CFR 60, Subpart Y, as applicable 

(ARM 17.8.340 and 40 CFR 60, Subpart Y). 
OP2035-02 9 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Reporting 

C.16. Any compliance source test reports must be submitted in accordance with Montana Source Test 

Protocol and Procedure Manual (ARM 17.8.106). 

C.17. The annual compliance certification required by Section V.B must contain a certification 

statement for the above applicable requirements (ARM 17.8.1212). 

C.18. The semiannual monitoring report shall provide (ARM 17.8.1212): 

a. Certification that the structural enclosures were maintained and in place during coal dumping; 

b. Certification that the baghouses were maintained and in place during operation of equipment; 

c. A summary of results of any source testing that was performed in that semiannual period; 

d. A summary of the log required in Section III.C.13; 

e. Certification that the stack heights meet the requirements in Section III.C.5 and a summary of 

any log entries noting any deviation from the normal operation with respect to stack height; 

and 

f. A summary of compliance requirements of 40 CFR 60, Subpart Y as applicable. 

D. EU005 – Limestone Unloading, Handling, and Storage 

Condition(s) Pollutant/ Compliance Demonstration 

Parameter 

Permit Limit 

Method Frequency 

Reporting 

Requirements 

Use and 

maintenance of 

a baghouse 

D.1., D.3., Ongoing Semiannual 

D.4., D.6., 

D.7., D.8., 

D.9., D.10. Opacity 20% Method 9 As required by the 

Department and 

Section III.A.1 

Semiannual 

Use and 

maintenance of 

a baghouse 

D.2., D.3., Ongoing Semiannual 

D.5., D.6., 

D.7., D.8., 

D.9., D.10. 

Particulate 

matter 

0.01 gr/dscf 

Method 201A As required by the 

Department and 

Section III.A.1 

Semiannual 

Conditions

D.1. CELP may 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). 

D.2. Limestone truck unloading, handling, and storage shall be controlled by a baghouse. Particulate 

emissions from the baghouse shall not exceed 0.01 gr/dscf (ARM 17.8.752). 
OP2035-02 10 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Compliance Demonstration

D.3. As required by the Department and Section III.A.1, CELP shall perform a Method 9 test to 

monitor compliance with the permit limit in Section III.D.1. The testing shall be performed in 

accordance with the Montana Source Test Protocol and Procedures Manual, or another method 

approved by the Department (ARM 17.8.106 and ARM 17.8.1213). 

D.4. CELP shall use and maintain structural enclosures surrounding process equipment and operate 

baghouses for maintaining compliance with Section III.D.2 (ARM 17.8.1213). 

D.5. As required by the Department and Section III.A.1, CELP shall perform a Method 201A 

(filterable) test to monitor compliance with the permit limit in Section III.D.2. The testing shall be 

performed in accordance with the Montana Source Test Protocol and Procedures Manual, or 

another method approved by the Department (ARM 17.8.106 and ARM 17.8.1213). 

Recordkeeping

D.6. All source test recordkeeping shall be performed in accordance with the Montana Source Test 

Protocol and Procedures Manual (ARM 17.8.106 and ARM 17.8.1212). 

D.7. CELP shall maintain on site, a log of all corrective actions taken and all repair and maintenance 

activity to the structural enclosures and baghouses. The log shall include, but is not limited to, the 

identification of the enclosure or baghouse, the date of the maintenance and/or corrective action, 

the name(s) of repair personnel, description of the maintenance activity and the item(s) repaired or 

replaced. The log shall be available to the Department for inspection and must be submitted to the 

Department upon request (ARM 17.8.1212). 

Reporting 

D.8. Any compliance source test reports must be submitted in accordance with Montana Source Test 

Protocol and Procedure Manual (ARM 17.8.106). 

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

statement for the above applicable requirements (ARM 17.8.1212). 

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

a. A summary of results of the last source testing that was performed in that semiannual period; 

and 

b. Certification that the log required in Section III.D.7 was maintained. 

E. EU006 – Circulating Fluidized Bed Boiler 

Condition(s) Pollutant/ Compliance Demonstration 

Parameter 

Permit Limit 

Method Frequency 

Reporting 

Requirements 

E.1, E.14, COMS Ongoing Quarterly 

E.15, E.30, 

E.39, E.40, 

E.42, E.43 

Opacity 20% 

Method 9 As required by 

the Department 

and Section 

III.A.1 

Semiannual 

E.2, E.16, 

E.30, E.39, 

E.40, E.42, 

E.43 

PM10 26.28 tons/year 

144.0 lbs/day 

6.0 lbs/hour 

Method 201A Annual Semiannual 
OP2035-02 11 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Compliance Demonstration 

E.3, E.30, 

E.39, E.40, 

E.42, E.43 

Particulate 

Matter 

0.03 lb/MMBtu heat 

input and 99% 

reduction 

Method 19 and 

Method 5 as 

specified in 40 

CFR 60 Subpart 

Da 

Annual Semiannual 

E.2, E.18, CEMS Ongoing Quarterly 

E.30, E.39, 

E.40, E.42, 

E.43 

SO2 1,840 tons/year 

5.04 tons/day 

432 lbs/hour (3-hour) 

574 lbs/hour (1-hour) 

Method 6 As required by 

the Department 

and Section 

III.A.1 

Semiannual 

E.4, E.17, 

E.25, E.40, 

E.42, E.43 

SO2 1.2 lb/MMBtu heat 

input and 90% 

reduction or 70% 

reduction with <0.60 

lb/MMBtu 

CEMS Ongoing Quarterly 

E.2, E.19, CEMS Ongoing Quarterly 

E.30, E.39, 

E.40, E.42, 

E.43 

NOx 1,435 tons/year 

7,864 lbs/day 

328 lbs/hour 

Method 7 As required by 

the Department 

and Section 

III.A.1 

Semiannual 

E.2, E.19, CEMS Ongoing Quarterly 

E.30, E.39, 

E.40, E.42, 

E.43 

CO 232 tons/year 

1,272 lbs/day 

53 lbs/hour 

Method 3B As required by 

the Department 

and Section 

III.A.1 

Semiannual 

E.2, E.21, 

E.31, E.40, 

E.42, E.43 

Emission 

Control 

Equipment 

Operation and 

maintenance of a 

baghouse 

Operation and 

maintenance of a 

baghouse 

Ongoing Semiannual 

E.5, E.22, 

E.40, E.42, 

E.43 

Stack Heights 200 feet Reporting Annual Annual 

E.6, E.23, 

E.33, E.40, 

E.42, E.43 

Fuel Burning More than 25% by 

weight coal refuse on 

an annual basis 

Reporting Annual Annual 

E.7, E.24, 

E.33, E.40, 

E.42, E.43 

40 CFR 60, 

Subpart Da 

40 CFR 60, Subpart 

Da 

40 CFR 60, 

Subpart Da 

40 CFR 60, 

Subpart Da 

Semiannual 

E.8, E.25, 

E.34, E.40, 

E.42, E.43 

PM CAM Plan ARM 17.8.1506 Provisions from 

CAM Plan, 

Appendix F 

Ongoing Semiannual 

E.9, E.26, 

E.35, E.40, 

E.42, E.43 

SO2 CAM Plan ARM 17.8.1506 Provisions from 

CAM Plan, 

Appendix G 

Ongoing Semiannual 

E.10, E.27, 

E.36, E.40, 

E.41, E.42, 

E.43 

Mercury 

Emissions 

0.9 lb/TBtu MEMS Ongoing Semiannual 

E.11, E.12, 

E.28, E.37, 

E.40, E.41, 

E.42, E.43 

Mercury 

Emission 

Control 

Equipment 

Mercury 

oxidizer/sorbent 

handling system 

Log Ongoing Semiannual 

E.13, E.29, 

E.38, E.40, 

E.42, E.43 

40 CFR Part 75 40 CFR Part 75 40 CFR Part 75 Ongoing Semiannual 
OP2035-02 12 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Conditions

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

any sources installed after November 23, 1968, that exhibit an opacity of 20% or greater averaged 

over 6 consecutive minutes (ARM 17.8.304 and ARM 17.8.749). 

E.2. CELP shall operate and maintain a baghouse on the CFB boiler. The CFB boiler’s emissions for 

the pollutants listed below shall not exceed the following for the times identified (ARM 17.8.752). 

Pollutant Annual Daily 3-Hour 1-Hour 

SO2 1,840 tons 5.04 tons 432 lbs/hr 574 lbs 

NOx 1,435 tons 7,864 lbs ----- 328 lbs 

CO 232 tons 1,272 lbs ----- 53 lbs 

PM10 26.28 tons 144.0 lbs ----- 6.0 lbs 

E.3. CELP shall not cause to be discharged into the atmosphere from any 40 CFR 60, Subpart Da 

affected facility any gases which contain particulate matter in excess of (ARM 17.8.749): 

a. 0.03 lb/MMBtu heat input derived from the combustion of solid, liquid, or gaseous fuel; 

and 

b. 1% of the potential combustion concentration (99% reduction) when combusting solid 

fuel per 40 CFR 60.42a. 

E.4. CELP shall not cause to be discharged into the atmosphere from any 40 CFR 60, Subpart Da 

affected facility any gases which contain sulfur dioxide (SO2) in excess of (ARM 17.8.749): 

a. 1.20 lb/MMBtu heat input and 10% of the potential combustion concentration (90% 

reduction), or 

b. 30 percent of the potential combustion concentration (70% reduction), when emissions 

are less than 0.60 lb/MMBtu heat input per 40 CFR Part 60.43a. 

E.5. The exhaust from the CFB boiler shall be discharged from a two hundred foot stack (ARM 

17.8.749). 

E.6. CELP shall burn fuel containing more than 25%, by weight, coal refuse on an annual basis (ARM 

17.8.749). 

E.7. CELP shall comply with all applicable standards and limitations, and the reporting, recordkeeping, 

and notification requirements contained in 40 CFR 60, Subpart Da (ARM 17.8.340 and 40CFR60, 

Subpart Da). 

E.8. CELP shall provide a reasonable assurance of compliance with emission limitations or standards 

for the anticipated range of operations at the Circulating Fluidized Bed Boiler for PM (ARM 

17.8.1504). 

E.9. CELP shall provide a reasonable assurance of compliance with emission limitations or standards 

for the anticipated range of operations at the Circulating Fluidized Bed Boiler for SO2 (ARM 

17.8.1504). 
OP2035-02 13 Date of Decision: 11/24/09 

Effective Date: 12/25/09

E.10. Beginning January 1, 2010, emissions of mercury from the boiler shall not exceed 0.9 pounds per 

trillion British thermal units (lb/TBtu), calculated as a rolling 12-month average (ARM 17.8.771). 

E.11. CELP shall install a mercury control system that oxidizes and sorbs emission of mercury. CELP 

shall implement the operation and maintenance of the mercury control system on or before January 

1, 2010 (ARM 17.8.771). 

E.12. CELP shall operate and maintain the mercury oxidizer/sorbent handling system, including the bin 

vent filter system, to provide the maximum air pollution control for that which the system was 

designed (ARM 17.8.749). 

E.13. CELP shall comply with all applicable standards and limitations, and the applicable operating, 

reporting, recordkeeping, and notification requirements contained in 40 CFR Part 75 (40 CFR Part 

75, ARM 17.8.771, and ARM 17.8.749). 

Compliance Demonstration

E.14. As required by the Department and Section III.A.1, CELP shall perform a Method 9 test to 

monitor compliance with the opacity limit in Section III.E.1. The testing shall be performed in 

accordance with the Montana Source Test Protocol and Procedures Manual or another method 

approved by the Department (ARM 17.8.106 and ARM 17.8.1213). 

E.15. CELP shall operate the continuous opacity monitor (COM) to monitor compliance with the 

opacity limitation in Section III.E.1. The operation and maintenance shall be performed in 

accordance with the Opacity CEMS Appendix E of this permit (ARM 17.8.749 and ARM 

17.8.1213). 

E.16. CELP shall perform a Method 201A (filterable) or another Department approved test method 

annually to monitor compliance with the PM10 limit in Section III.E.2. The test methods and 

procedures shall be conducted in accordance with the Montana Source Test Protocol and 

Procedures Manual (ARM 17.8.106). 

E.17. To monitor compliance with Section III.E.4., CELP shall follow 40 CFR 60.48a, including 

Reference Method 19 and using an F-factor of 10,024 dscf/MMBtu (ARM 17.8.749; 40 CFR 60, 

Subpart Da; 40 CFR 60, Appendix A). 

E.18. As required by the Department and Section III.A.1, CELP shall perform a Method 6 or other 

Department approved test method to monitor compliance with the SO2 emissions limit in Section 

III.E.2 (ARM 17.8.1213). 

E.19. As required by the Department and Section III.A.1, CELP shall perform a Method 7 or other 

Department approved test method to monitor compliance with the NOx emission limit in Section 

III.E.2 (ARM 17.8.1213). 

E.20. As required by the Department and Section III.A.1, CELP shall perform a Method 3B or other 

Department approved test method to monitor compliance with the CO emission limit in Section 

III.E.2 (ARM 17.8.1213). 

E.21. CELP shall operate and maintain a baghouse to demonstrate compliance with the requirement in 

Section III.E.2 (ARM 17.8.1213). 

E.22. CELP shall verify that the CFB boiler stack height was maintained at 200 feet as specified in 

Section III.E.5 (ARM 17.8.1213). 
OP2035-02 14 Date of Decision: 11/24/09 

Effective Date: 12/25/09

E.23. CELP shall report annually the amount of coal consumed (tons) and the amount of coal refuse 

consumed (tons) at the facility over the previous 12 months (ARM 17.8.1213). 

E.24. Compliance monitoring for the applicable requirements contained in 40 CFR 60, Subpart Da shall 

be accomplished as described in 40 CFR 60, Subpart Da (ARM 17.8.340 and 40 CFR 60, Subpart 

Da). 

E.25. CELP shall monitor compliance by following the Compliance Assurance Monitoring (CAM) Plan 

for PM (Appendix F). The CAM Plan, written by CELP in accordance with ARM 17.8.1504 is 

summarized in Appendix F and is available in full upon request by the Department or the facility 

(ARM 17.8.1503 and ARM 17.8.1213). 

E.26. CELP shall monitor compliance by following the Compliance Assurance Monitoring (CAM) Plan 

for SO2 (Appendix G). The CAM Plan, written by CELP in accordance with ARM 17.8.1504 is 

summarized in Appendix G and is available in full upon request by the Department or the facility 

(ARM 17.8.1503 and ARM 17.8.1213). 

E.27. In order to monitor compliance with the mercury emission limit in III.B.8, an MEMS shall be 

installed, certified, and operating on the boiler stack outlet on or before January 1, 2010. The 

MEMS shall also comply with the applicable provisions of 40 CFR Part 75 and the requirements 

included in Appendix H (ARM 17.8.1213). 

E.28. Monitoring compliance with the requirements for the installation and operation of mercury 

oxidizer/sorbent handling system shall be accomplished through recordkeeping (ARM 17.8.1213). 

E.29. Compliance monitoring for the operating, reporting, recordkeeping, and notification requirements 

contained in 40 CFR Part 75 shall be accomplished as described in 40 CFR 75 (ARM 17.8.340 and 

40 CFR 75). 

Recordkeeping

E.30. All source test recordkeeping shall be performed in accordance with the Montana Source Test 

Protocol and Procedures Manual (ARM 17.8.106 and ARM 17.8.1212). 

E.31. CELP shall maintain on site a log of the average daily pressure differential across the baghouse 

when the baghouse is operating. The log shall include, but is not limited to, the date and time of 

the measurement and the pressure differential reading. In addition, CELP shall maintain a log of 

corrective actions and all repair and maintenance activity to the baghouse. The log shall include, 

but is not limited to, the identification information for the baghouse, the date of the maintenance 

and/or corrective action, the name(s) repair personnel, description of the maintenance activity and 

the item(s) repaired or replaced. The logs shall be available to the Department for inspection and 

must be submitted to the Department upon request (ARM 17.8.1212). 

E.32. CELP shall maintain a log on site of the weight percent sulfur and heating value (BTU/lb) of the 

waste coal fuel (ARM 17.8.1212). 

E.33. CELP shall maintain a log on site of the amount of coal consumed (tons) and the amount of coal 

refuse consumed (tons) at the facility (ARM 17.8.1212). 

E.34. CELP shall prepare and keep data in accordance with 40 CFR Part 64 and the CAM Plan for PM, 

Appendix F of this permit (ARM 17.8.1212 and 40 CFR Part 64). 

E.35. CELP shall prepare and keep data in accordance with 40 CFR Part 64 and the CAM Plan for SO2, 

Appendix G of this permit (ARM 17.8.1212 and 40 CFR Part 64). 
OP2035-02 15 Date of Decision: 11/24/09 

Effective Date: 12/25/09

E.36. Records shall be prepared and data kept in accordance with 40 CFR Part 75 and the MEMS 

Appendix H of this permit (ARM 17.8.1212 and 40 CFR 75). 

E.37. For any time after January 1, 2010, CELP shall record in a log the date, time, and duration of any 

incident where the mercury oxidizer/sorbent handling system is not maintained or operational 

(ARM 17.8.1212). 

E.38. CELP shall perform recordkeeping in accordance with 40 CFR Part 75 (ARM 17.8.1212 and 40 

CFR Part 75). 

Reporting 

E.39. Any compliance source test reports must be submitted in accordance with the Montana Source 

Test Protocol and Procedures Manual (ARM 17.8.1212 and ARM 17.8.106). 

E.40. Excess emission reports and the results of inspections and audits, as required in Appendix E, shall 

be submitted quarterly to the Department (ARM 17.8.1212 and ARM 17.8.106). 

E.41. The owner or operator of any mercury-emitting generating unit shall report to the Department 

within 30 days after the end of each calendar quarter, as described in Appendix H (ARM 

17.8.749): 

a. The monthly average lb/TBtu mercury emission rate, for each month of the quarter; 

b. The 12-month rolling average lb/TBtu emission rate for each month of the reporting quarter; 

and 

c. Number of operating hours that the MEMS was unavailable or not operating within quality 

assurance limits (monitor downtime). 

 The first quarterly report must be received by the Department by April 30, 2010, but shall not 

include 12-month rolling averages. The first quarterly report to include 12-month rolling averages 

must be received by the Department by January 30, 2011 (ARM 17.8.749). 

E.42. The annual compliance certification required by Section V.B must contain a certification statement 

for the above applicable requirements (ARM 17.8.1212). 

E.43. The semiannual 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. Certification that the baghouse was maintained and in place during operation of equipment; 

c. Certification that the logs required in Sections III.E.24, III.E.25, and III.E.26 were maintained; 

d. A summary of compliance with requirements of 40 CFR 60, Subpart Da as applicable; 

e. Certification of compliance with 40 CFR Part 64 (CAM), Appendix F; 

f. Certification of compliance with 40 CFR Part 64 (CAM), Appendix G; and, 

g. A summary of the log when the mercury oxidizer/sorbent handling system was not maintained 

or operational. 
OP2035-02 16 Date of Decision: 11/24/09 

Effective Date: 12/25/09

F. EU007 – Flyash Conveying and Storage; EU008 – Bedash Conveying and Storage; EU009 – 

Ash Storage Silo Unloading 

Condition(s) Pollutant/ Compliance Demonstration 

Parameter 

Permit Limit 

Method Frequency 

Reporting 

Requirement 

Use and 

maintenance of 

baghouse 

Whenever 

process 

equipment is 

operating 

F.1., F.6., Semiannual 

F.8., F.11., 

F.12., F.13., 

F.14., F.15., 

F.16. 

Opacity 20% 

Method 9 As required by 

the Department 

and Section 

III.A.1 

Semiannual 

Use and 

maintenance of 

baghouses 

Whenever 

process 

equipment is 

operating 

F.2., F.3., Semiannual 

F.6., F.9., 

F.11., F.12., 

F.13., F.14., 

F.15., F.16. 

PM10 0.004 gr/sdcf 

(EU007 and 

EU008) 

Method 201A As required by 

the Department 

and Section 

III.A.1 

Semiannual 

Use and 

maintenance of 

baghouses 

Whenever 

process 

equipment is 

operating 

F.4., F.6., Semiannual

F.7., F.9., 

F.11., F.12., 

F.14., F.15., 

F.16. 

PM10 0.01 gr/dscf 

(EU009) 

Method 201A As required by 

the Department 

and Section 

III.A.1 

Semiannual

F.5., F.10., 

F.15., F.16. 

Stack 

Heights 

22 feet above 

the ground 

Certification Ongoing Annual 

Conditions 

F.1. CELP 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). 

F.2. Flyash conveying and storage shall be controlled by a baghouse. PM10 emissions from the 

baghouse shall not exceed 0.004 gr/dscf (ARM 17.8.752). 

F.3. Bedash conveying and storage shall be controlled by a baghouse. PM10 emissions from the 

baghouse shall not exceed 0.004 gr/dscf (ARM 17.8.752). 

F.4. Ash storage silo unloading shall be controlled by a baghouse and covered haul trucks. PM10

emissions from the baghouse shall not exceed 0.01 gr/dscf (ARM 17.8.752). 

F.5. CELP shall maintain the stacks on the flyash and bedash storage baghouse/cartridge 22 feet above 

the ground (ARM 17.8.749). 
OP2035-02 17 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Compliance Demonstration 

F.6. CELP shall use and maintain a baghouse to monitor compliance with the 20% opacity limit in 

Section III.F.1 and the particulate limits in Section III.F.2., III.F.3, and III.F.4 (ARM 17.8.1213). 

F.7. CELP shall use covered haul trucks for Ash storage silo unloading to monitor compliance with 

Section III.F.4 (ARM 17.8.1213). 

F.8. As required by the Department and Section III.A.1, CELP shall perform a Method 9 test in 

accordance with the Montana Source Test Protocol and Procedures Manual to monitor compliance 

with Section III.F.1 (ARM 17.8.106 and ARM 17.8.1213). 

F.9. As required by the Department and Section III.A.1, CELP shall perform a Method 201A 

(filterable) in accordance with the Montana Source Test Protocol and Procedures Manual to 

monitor compliance with Section III.F.2, Section III.F.3, and Section III.F.4 (ARM 17.8.106 and 

ARM 17.8.1213). 

F.10. The stack height requirements for the flyash and bedash storage baghouse/cartridge specified in 

Section III.F.5 shall be accomplished through initial certification and normal operations 

maintaining compliance on an ongoing basis (ARM 17.8.1213). 

Recordkeeping 

F.11. All source test recordkeeping shall be performed in accordance with the Montana Source Test 

Protocol and Procedures Manual (ARM 17.8.106). 

F.12. CELP shall maintain a log of all repair and maintenance activity to any baghouse. The log must 

include, but is not limited to, the date, time, and action(s) taken. The maintenance log shall be 

maintained as a permanent business record for at least five years following the activity. The log 

shall be available to the Department for inspection and must be submitted to the Department upon 

request (ARM 17.8.1212). 

F.13. CELP shall maintain on site a flyash and bedash storage baghouse/cartridge log documenting any 

stack specifications that deviate from normal operations as specified in Section III.F.10. At a 

minimum, the flyash and bedash storage baghouse/cartridge log shall include the required 

information, the date, and the initials of the documenting personnel (ARM 17.8.1212). 

Reporting 

F.14. Any compliance source test reports must be submitted in accordance with Montana Source Test 

Protocol and Procedure Manual (ARM 17.8.106). 

F.15. The annual compliance certification required by Section V.B must contain a certification statement 

for the above applicable requirements (ARM 17.8.1212). 

F.16. The semiannual monitoring report shall provide (ARM 17.8.1212): 

a. A summary of any source testing that was performed during the last semiannual 

period; 

b. Certification that the stack heights are maintained as required in Section III.F.5; and 

c. Certification that the log required in Section III.F.13 was maintained. 
OP2035-02 18 Date of Decision: 11/24/09 

Effective Date: 12/25/09

G. EU010 - Ash Truck Unloading 

Conditions Pollutant/Parameter Permit Compliance Demonstration 

Limit Method Frequency 

Reporting 

Requirement 

G.1., G.2., 

G.3., G.4., 

G.5., G.6., 

G.7. 

Opacity 20% Visual Survey Weekly Semiannual 

Conditions 

G.1. CELP 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). 

Compliance Demonstration 

G.2. Once weekly during daylight hours, CELP shall visually survey the Ash Truck Unloading for any 

sources of excessive emissions. For the purpose of this survey, excessive emissions are considered 

to be any visible emissions, which meet or exceed 15% opacity. The person conducting the survey 

does not have to be an EPA Method 9 certified observer. However, the individual must have been 

certified as a Method 9 certified observer. However, the individual must have been certified as a 

Method 9 observer within the previous 2 years of the visual survey being performed. If sources of 

excessive emissions are identified, CELP shall immediately conduct a Method 9 or take corrective 

action to contain or minimize the source of emissions. If corrective actions are taken, then CELP 

shall immediately conduct a subsequent visual survey to monitor compliance. The person 

conducting the visual survey shall record the results of the survey in a log, including any 

corrective action taken. Conducting a visual survey does not relieve CELP of a liability for a 

violation determined using Method 9 (ARM 17.8.1213). 

If visual surveys are not conducted once per calendar week during the reporting period, as 

specified above, CELP shall perform a semiannual Method 9 source test for the visible emissions 

from the affected unit. Method 9 source tests must be performed in accordance with the Montana 

Source Test Protocol and Procedures Manual, except that prior notification of the test is not 

required. Each observation period must be a minimum of 6 minutes unless any one reading meets 

or exceeds the applicable limit, then the observation period must be a minimum of 20 minutes or 

until a violation of the standard has been documented, whichever is a shorter period of time (ARM 

17.8.1213). 

Recordkeeping 

G.3. All source test recordkeeping shall be performed in accordance with the Montana Source Test 

Protocol and Procedures Manual (ARM 17.8.106). 

G.4. CELP shall maintain a log recording the results of the visual surveys. The log shall include but is 

not limited to the date, time, observer(s), observer(s)’s location, the area being surveyed, and the 

results of the visual survey. If any preventative or corrective action is required, the time, date, and 

a description of the action taken must be included in the log. The log shall be available to the 

Department for inspection and must be submitted to the Department upon request (ARM 

17.8.1212). 
OP2035-02 19 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Reporting 

G.5. Any compliance source test reports must be submitted in accordance with Montana Source Test 

Protocol and Procedure Manual (ARM 17.8.106). 

G.6. The annual compliance certification required by Section V.B must contain a certification statement 

for the above applicable requirements (ARM 17.8.1212). 

G.7. The semiannual monitoring report shall provide (ARM 17.8.1212): 

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

b. Certification that the log was maintained as required in Section III.G.4. 

H. EU011 – Fugitive Emissions: Ash Disposal Area 

Conditions Pollutant/Parameter Permit Compliance Demonstration 

Limit Method Frequency 

Reporting 

Requirement 

H.1., H.2., Visual Survey Weekly Semiannual 

H.4., H.6., 

H.7., H.8., 

H.9., H.10., 

H.11. 

Opacity 20% 

Use of Water 

Spray 

As Needed Semiannual 

H.3., H.5., 

H.8., H.9., 

H.10., H.11. 

Disposal Site 

Inactivity 

Mitigative 

Measures 

Determined 

by the 

Department 

As Required Annual 

Conditions 

H.1. CELP 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 from any stationary source shall not exhibit an opacity of 20% 

or greater averaged over 6 consecutive minutes (ARM 17.8.308(1)). 

H.2. CELP shall use water spray to control fugitive emissions of particulate matter from the ash 

disposal area. Ash at the disposal site shall not be handled in such a manner as to create 

emissions in excess of 20% opacity (ARM 17.8.749). 

H.3. If a portion of the ash disposal area is inactive and the Department determines it to be necessary, 

CELP shall provide mitigative measures, including, but not limited to, revegetation, to control 

wind-blown emissions from the area. The Department shall determine the necessity of the 

control measures above on the basis of Department observation, results of ambient air quality 

monitoring, complaints, or any combination of the above (ARM 17.8.749). 

Compliance Demonstration 

H.4. Once weekly during daylight hours, CELP shall visually survey the Ash Disposal Area for any 

sources of excessive emissions. For the purpose of this survey, excessive emissions are 

considered to be any visible emissions, which meet or exceed 15% opacity. The person 

conducting the survey does not have to be an EPA Method 9 certified observer. However, the 

individual must have been certified as a Method 9 certified observer. However, the individual 

must have been certified as a Method 9 observer within the previous 2 years of the visual survey 
OP2035-02 20 Date of Decision: 11/24/09 

Effective Date: 12/25/09

being performed. If sources of excessive emissions are identified, CELP shall immediately 

conduct a Method 9 or take corrective action to contain or minimize the source of emissions. If 

corrective actions are taken, then CELP shall immediately conduct a subsequent visual survey to 

monitor compliance. The person conducting the visual survey shall record the results of the 

survey in a log, including any corrective action taken. Conducting a visual survey does not 

relieve CELP of a liability for a violation determined using Method 9. 

If visual surveys are not conducted once per calendar week during the reporting period, as 

specified above, CELP shall perform a semiannual Method 9 source test for the visible emissions 

from the affected unit. Method 9 source tests must be performed in accordance with the Montana 

Source Test Protocol and Procedures Manual, except that prior notification of the test is not 

required. Each observation period must be a minimum of 6 minutes unless any one reading meets 

or exceeds the applicable limit, then the observation period must be a minimum of 20 minutes or 

until a violation of the standard has been documented, whichever is a shorter period of time 

(ARM 17.8.1213). 

H.5. If any mitigative measures have been required, CELP shall verify the mitigative measures have 

been permformed (ARM 17.8.1213). 

Recordkeeping 

H.6. All source test recordkeeping shall be performed in accordance with the Montana Source Test 

Protocol and Procedures Manual (ARM 17.8.106). 

H.7. CELP shall maintain a log recording the results of the visual surveys. The log shall include but is 

not limited to the date, time, observer(s)’s location, the area being surveyed, and the results of the 

visual survey(s). If any corrective action is required the time, date, and a description of the action 

taken must be included in the log. The log shall be available to the Department for inspection and 

must be submitted to the Department upon request (ARM 17.8.1212). 

H.8. CELP shall maintain a log on site of any mitigative measures taken, if required (ARM 

17.8.1212). 

Reporting 

H.9. Any compliance source test reports must be submitted in accordance with Montana Source Test 

Protocol and Procedure Manual (ARM 17.8.106). 

 

H.10. The annual compliance certification required by Section V.B must contain a certification 

statement for the above applicable requirements (ARM 17.8.1212). 

H.11. The semiannual monitoring report shall provide (ARM 17.8.1212): 

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

b. Certification that the log was maintained as required in Section III.H.7; and 

c. Certification that the log, if required, was maintained as required in Section III.H.8. 
OP2035-02 21 Date of Decision: 11/24/09 

Effective Date: 12/25/09

I. EU012 – Fugitive Emissions: Vehicle Traffic 

Conditions Pollutant/Parameter Permit Limit Compliance Demonstration 

Method Frequency 

Reporting 

Requirement 

I.1., I.3., I.5., 

I.6., I.7., I.8., 

I.9. 

Opacity 20% Visual Survey Weekly Semiannual 

I.2., I.4., I.7., 

I.8., I.9. 

Airborne Particulate 

Matter 

Reasonable 

Precautions 

Water and/or 

chemical 

suppressants 

As Needed Semiannual 

Conditions 

I.1. CELP 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 from any stationary source shall not exhibit an opacity of 20% 

or greater averaged over 6 consecutive minutes (ARM 17.8.308(1)). 

I.2. CELP 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 (ARM 17.8.308(2)). 

Compliance Demonstration 

I.3. Once weekly during daylight hours, CELP shall visually survey Vehicle Traffic for any sources 

of excessive emissions. For the purpose of this survey, excessive emissions are considered to be 

any visible emissions, which meet or exceed 15% opacity. The person conducting the survey 

does not have to be an EPA Method 9 certified observer. However, the individual must have 

been certified as a Method 9 certified observer. However, the individual must have been certified 

as a Method 9 observer within the previous 2 years of the visual survey being performed. If 

sources of excessive emissions are identified, CELP shall immediately conduct a Method 9 or 

take corrective action to contain or minimize the source of emissions. If corrective actions are 

taken, then CELP shall immediately conduct a subsequent visual survey to monitor compliance. 

The person conducting the visual survey shall record the results of the survey in a log, including 

any corrective action taken. Conducting a visual survey does not relieve CELP of a liability for a 

violation determined using Method 9. 

If visual surveys are not conducted once per calendar week during the reporting period, as 

specified above, CELP shall perform a semiannual Method 9 source test for the visible emissions 

from the affected unit. Method 9 source tests must be performed in accordance with the Montana 

Source Test Protocol and Procedures Manual, except that prior notification of the test is not 

required. Each observation period must be a minimum of six minutes unless any one reading 

meets or exceeds the applicable limit, then the observation period must be a minimum of 20 

minutes or until a violation of the standard has been documented, whichever is a shorter period of 

time (ARM 17.8.1213). 

I.4. CELP shall treat all unpaved portions of the haul roads, access roads, parking lots, or the general 

plant area with water and/or chemical dust suppressant as necessary to maintain compliance with 

the reasonable precautions limitation (ARM 17.8.1213). 

Recordkeeping 

I.5. All source test recordkeeping shall be performed in accordance with the Montana Source Test 

Protocol and Procedures Manual (ARM 17.8.106). 
OP2035-02 22 Date of Decision: 11/24/09 

Effective Date: 12/25/09

I.6. CELP shall maintain a log recording the results of the visual surveys. The log shall include but is 

not limited to the date, time, observer(s)’s location, the area being surveyed, and the results of the 

visual survey(s). If any corrective action is required the time, date, and a description of the action 

taken must be included in the log. The log shall be available to the Department for inspection and 

must be submitted to the Department upon request (ARM 17.8.1212). 

Reporting 

I.7. Any compliance source test reports must be submitted in accordance with Montana Source Test 

Protocol and Procedure Manual (ARM 17.8.106). 

I.8. The annual compliance certification required by Section V.B must contain a certification 

statement for the above applicable requirements (ARM 17.8.1212). 

I.9. The semiannual monitoring report shall provide (ARM 17.8.1212): 

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

b. Certification that the log was maintained as required in Section III.I.6. 
OP2035-02 23 Date of Decision: 11/24/09 

Effective Date: 12/25/09

SECTION IV. NON-APPLICABLE REQUIREMENTS 

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

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

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

become applicable during the permit term. 

A. Facility-Wide 

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

Management Bureau of the Department of Environmental Quality. 

Rule Citation Reason 

40 CFR 60.18 The control devices specified by this rule are 

not applicable to this facility. 

40 CFR 60, Subparts C, Ca, Cb, Cc, Cd 

40 CFR 60, Subparts D, Db, Dc 

40 CFR 60, Subparts E-J 

40 CFR 60, Subparts K, Ka, Kb 

40 CFR 60, Subparts L-X 

40 CFR 60, Subpart 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 61, Subparts B-F 

40 CFR 61, Subparts H-L 

40 CFR 61, Subparts N-R 

40 CFR 60, 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 63 Subparts F-I, L, M-O, Q-U, W-Y, CCEE, GG, II-RR, EEE, JJJ 

40 CFR 68 

40 CFR 82 Subparts A-E, G-H

These requirements are not applicable because 

the facility is not an affected source as defined 

in these regulations. 

40 CFR 72 

40 CFR 73 

40 CFR 75 

40 CFR 76 

40 CFR 77 

40 CFR 78

These requirements are not applicable because 

the facility is not an affected source as defined 

by the acid rain regulations. 

ARM 17.8.316 

ARM 17.8.320 

ARM 17.8.321 

ARM 17.8.323 

ARM 17.8.324 

ARM 17.8.326 

ARM 17.8.331 

ARM 17.8.332 

ARM 17.8.333 

ARM 17.8.334 

These rules are not applicable because the 

facility is not listed in the source category cited 

in the rule. 
OP2035-02 24 Date of Decision: 11/24/09 

Effective Date: 12/25/09

B. Emission Units 

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

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

Section IV.A, these requirements relate to each specific unit, as well as facility wide. 
OP2035-02 25 Date of Decision: 11/24/09 

Effective Date: 12/25/09

SECTION V. GENERAL PERMIT CONDITIONS 

A. Compliance Requirements 

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

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

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

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

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

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

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

any permit condition. 

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

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

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

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

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

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

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

avoided. 

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

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

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

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

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

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

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

provided in 75-2-105, MCA. 

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

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

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

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

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

the applicable requirement or the Department. 

B. Certification Requirements 

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

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

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

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

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

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

complete. 

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

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

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

December 31). 
OP2035-02 26 Date of Decision: 11/24/09 

Effective Date: 12/25/09

3. Compliance certifications shall include the following: 

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

certification; 

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

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

period, consistent with ARM 17.8.1212; 

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

certification, including whether compliance during the period was continuous or 

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

described above); and 

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

source. 

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

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

permit. 

C. Permit Shield 

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

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

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

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

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

requirements as of the date of permit issuance. 

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

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

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

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

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

under that section; 

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

requirements prior to or at the time of permit issuance; 

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

the FCAA; 

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

of the FCAA; 

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

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

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

Chapter 2, MCA; and 
OP2035-02 27 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

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

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

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

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

decision. 

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

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

17.8.106, Source Testing Protocol. 

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

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

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

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

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

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

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

permit revision (see Sections I & J). 

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

ownership (see Sections K & O). 

D. Monitoring, Recordkeeping, and Reporting Requirements 

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

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

records that include the following information: 

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

b. The date(s) analyses were performed; 

c. The company or entity that performed the analyses; 

d. The analytical techniques or methods used; 

e. The results of such analyses; and 

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

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

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

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

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

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

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

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

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

and shall be made available to Department personnel upon request. 
OP2035-02 28 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

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

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

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

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

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

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

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

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

17.8.1207. 

E. Prompt Deviation Reporting 

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

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

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

actions or preventive measures taken. To be considered prompt, deviations shall be reported as part 

of the routine reporting requirements under ARM 17.8.1212(3)(b) and, if applicable, in accordance 

with the malfunction reporting requirements under ARM 17.8.110, unless otherwise specified in an 

applicable requirement. 

F. Emergency Provisions 

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

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

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

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

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

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

or improper operation, or operator error. 

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

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

contemporaneous logs, or other relevant evidence, that: 

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

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

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

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

permit; and 

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

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

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

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

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

contained in any applicable requirement. 
OP2035-02 29 Date of Decision: 11/24/09 

Effective Date: 12/25/09

G. Inspection and Entry 

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

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

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

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

administrator) to perform the following: 

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

permit; 

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

conditions of the permit; 

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

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

the permit; and 

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

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

of assuring compliance with the permit or applicable requirements. 

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

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

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

H. Fee Payment 

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

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

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

Subchapter 5. 

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

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

receipt of the notice, unless the fee assessment is appealed pursuant to ARM 17.8.511. If any 

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

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

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

review of the Board’s decision. 

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

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

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

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

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

I. Minor Permit Modifications 

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

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

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

reference any required information that has been previously submitted. 
OP2035-02 30 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

pursuant to ARM 17.8.1226. 

J. Changes Not Requiring Permit Revision 

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

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

the following conditions are met: 

a. The proposed changes do not require the permittee to obtain an air quality preconstruction 

permit under ARM Title 17, Chapter 8, Subchapter 7; 

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

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

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

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

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

emission limitations on emission units covered by the permit; and 

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

7 days prior to making the proposed changes. 

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

their respective copies of this permit. 

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

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

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

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

permit term or condition that is no longer applicable as a result of the change. 

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

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

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

conditions; 

b. The Department has not objected to such change; 

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

permit term or condition; and 

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

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

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

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

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

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

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

and decreases in emissions pursuant to ARM 17.8.1224(4). 
OP2035-02 31 Date of Decision: 11/24/09 

Effective Date: 12/25/09

K. Significant Permit Modifications 

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

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

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

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

administrative permit amendment; 

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

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

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

requirements of the rule; or 

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

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

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

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

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

revision, updating, supplementation or deletion. 

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

L. Reopening for Cause 

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

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

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

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

completed not later than 18 months after promulgation of the applicable requirement. No 

reopening is required under ARM 17.8.1228(1)(a) if the effective date of the applicable 

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

permit or any of its terms or conditions have been extended pursuant to ARM 17.8.1220(12) or 

17.8.1221(2); 

2. 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; 

3. 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 

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

reissued to ensure compliance with the applicable requirements. 

M. Permit Expiration and Renewal 

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

1. This permit is issued for a fixed term of 5 years. 
OP2035-02 32 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

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

administrator review. 

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

administratively complete renewal application has been submitted consistent with ARM 

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

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

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

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

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

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

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

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

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

N. Severability Clause 

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

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

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

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

final permit decision had not been reached by the Department. 

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

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

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

invalid applications. 

O. Transfer or Assignment of Ownership 

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

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

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

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

and new permittee. 

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

amendments. 

P. Emissions Trading, Marketable Permits, Economic Incentives 

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

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

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

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

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

or in applicable requirements promulgated by the administrator. 

Q. No Property Rights Conveyed 

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

This permit does not convey any property rights of any sort, or any exclusive privilege. 
OP2035-02 33 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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. 

W. Annual Emissions Inventory 

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

(STATE ONLY)

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

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

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

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

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

X. Open Burning 

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

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

Y. Montana Air Quality Permits 

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

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

EPA as part of the SIP) 

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

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

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

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

2. The permittee shall comply with ARM 17.8.743, 744, 745, 748, and 764. 
OP2035-02 34 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

operation at a facility holding Montana Air Quality Permit issued under Chapter 8 that does not 

increase the facility’s potential to emit by more than 15 tons per year of any pollutant, except 

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

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

existing Montana Air Quality Permit or any applicable rule contained in Chapter 8 is 

prohibited, except as provided in ARM 17.8.745(2); 

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

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

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

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

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

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

year may not be artificially split into smaller projects to avoid air quality preconstruction 

permitting; or 

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

determining the potential emission increase from construction or changed conditions of 

operation, unless such reductions are made federally enforceable. 

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

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

diameter, stack gas temperature, source location or fuel specifications, or would result in an 

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

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

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

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

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

SIP). 

Z. National Emission Standard for Asbestos 

40 CFR, Part 61, Subpart M

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

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

AA. Asbestos 

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

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

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

40 CFR, Part 82, Subpart B

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

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

applicable requirements as specified in 40 CFR 82, Subpart B. 
OP2035-02 35 Date of Decision: 11/24/09 

Effective Date: 12/25/09

CC. Stratospheric Ozone Protection – Recycling and Emission Reductions 

40 CFR, Part 82, Subpart F

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

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

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

required practices pursuant to §82.156; 

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

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

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

an approved technical certification program pursuant to §82.161; 

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

appliances must comply with recordkeeping requirements pursuant to §82.166; 

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

leak repair requirements pursuant to §82.156; and 

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

keep records of refrigerant purchased and added to such appliances pursuant to §82.166. 

DD. Emergency Episode Plan 

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

Air Quality Control Implementation Plan. 

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

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

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

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

timetable developed by the Department, following Priority I reclassification. 

EE.Definitions 

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

permit, shall have the meaning assigned to them in the referenced regulations. 
OP2035-02 36 Date of Decision: 11/24/09 

Effective Date: 12/25/09

APPENDICES 
OP2035-02 A-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Appendix A INSIGNIFICANT EMISSION UNITS 

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

assist CELP, 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 were provided by CELP. Because there are 

no requirements to update such a list, the emission units and/or activities may change from those specified 

in the table. 

Emissions Unit ID Description 

IEU01 Fugitive Emissions: Diesel Fuel Combustion 

IEU02 Diesel Fuel Oil Storage Tanks 

IEU03 Diesel-fired Emergency Boiler Feed Pump 

IEU04 Diesel-fired Fire Water Supply Pump 

IEU05 Propane-fired Portable Heaters 

IEU06 Gasoline-fired Portable Welder 
OP2035-02 B-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Appendix B DEFINITIONS and ABBREVIATIONS 

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

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

(a) Corrects typographical errors; 

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

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

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

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

no less stringent than current monitoring or reporting requirements; 

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

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

with ARM 17.8.1225; or 

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

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

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

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

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

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

sources covered under the operating permit): 

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

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

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

administrator through rule making under Title I of the FCAA; 

(b) Any federally enforceable term, condition or other requirement of any air quality 

preconstruction permit issued by the Department under Subchapters 7, 8, 9 and 10 of this 

chapter, or pursuant to regulations approved or promulgated through rule making under Title 

I of the FCAA, including Parts C and D; 

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

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

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

management plan required under Sec. 7412(r); 

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

regulations promulgated thereunder; 

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

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

FCAA; 
OP2035-02 B-2 Date of Decision: 11/24/09 

Effective Date: 12/25/09

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

7511b(e) of the FCAA; 

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

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

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

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

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

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

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

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

the Department under Subchapter 6. 

"Department" means the Montana Department of Environmental Quality. 

“Excess Emissions” means any visible emissions from a stack or source, viewed during the visual 

surveys, that meets or exceeds 15% opacity (or 30% opacity if associated with a 40% opacity limit) 

during normal operating conditions. 

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

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

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

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

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

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

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

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

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

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

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

vent, or other functionally equivalent opening. 

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

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

lieu of individual permits being issued to each source. 

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

Section 112(b) of the FCAA. 

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

source requiring an air quality operating permit: 

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

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

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

administrator through rule making under Title I of the FCAA; 
OP2035-02 B-3 Date of Decision: 11/24/09 

Effective Date: 12/25/09

(b) Any term, condition or other requirement contained in any air quality preconstruction permit 

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

enforceable; 

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

chapter. 

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

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

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

pursuant to this subchapter. 

"Regulated air pollutant" means the following: 

(a) Nitrogen oxides or any volatile organic compounds; 

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

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

(d) Any Class I or II substance subject to a standard promulgated under or established by Title VI 

of the FCAA; or 

(e) Any pollutant subject to a standard or other requirement established or promulgated under 

Sec. 7412 of the FCAA, including but not limited to the following: 

(i) Any pollutant subject to requirements under Sec. 7412(j) of the FCAA. If the 

administrator fails to promulgate a standard by the date established in Sec. 7412(e) of the 

FCAA, any pollutant for which a subject source would be major shall be considered to be 

regulated on the date 18 months after the applicable date established in Sec. 7412(e) of 

the FCAA; 

(ii) Any pollutant for which the requirements of Sec. 7412(g)(2) of the FCAA have been met 

but only with respect to the individual source subject to Sec. 7412(g)(2) requirement. 

"Responsible official" means one of the following: 

(a) For a corporation: a president, secretary, treasurer, or vice-president of the corporation in 

charge of a principal business function, or any other person who performs similar policy or 

decision-making functions for the corporation, or a duly authorized representative of such 

person if the representative is responsible for the overall operation of one or more 

manufacturing, production, or operating facilities applying for or subject to a permit and 

either: 

(i) The facilities employ more than 250 persons or have gross annual sales or expenditures 

exceeding $25 million (in second quarter 1980 dollars); or 

(ii) The delegation of authority to such representative is approved in advance by the 

Department. 

(b) For a partnership or sole proprietorship: a general partner or the proprietor, respectively. 
OP2035-02 B-4 Date of Decision: 11/24/09 

Effective Date: 12/25/09

(c) For a municipality, state, federal, or other public agency: either a principal executive officer 

or ranking elected official. For the purposes of this part, a principal executive officer of a 

federal agency includes the chief executive officer having responsibility for the overall 

operations of a principal geographic unit of the agency (e.g., a regional administrator of the 

environmental protection agency). 

(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. 
OP2035-02 B-5 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Abbreviations:

ARM Administrative Rules of Montana 

ASTM American Society of Testing Materials 

BACT Best Available Control Technology 

BDT bone dry tons 

BTU British Thermal Unit 

CFR Code of Federal Regulations 

CO carbon monoxide 

DEQ Department of Environmental Quality 

dscf dry standard cubic foot 

dscfm dry standard cubic foot per minute 

EEAP Emergency Episode Action Plan 

EPA U.S. Environmental Protection Agency 

EPA Method Test methods contained in 40 CFR 60, Appendix A 

EU emissions unit 

FCAA Federal Clean Air Act 

gr grains 

HAP hazardous air pollutant 

IEU insignificant emissions unit 

Mbdft thousand board feet 

Method 5 40 CFR 60, Appendix A, Method 5 

Method 9 40 CFR 60, Appendix A, Method 9 

MMbdft million board feet 

MMBTU million British Thermal Units 

NOx oxides of nitrogen 

NO2 nitrogen dioxide 

O2 oxygen 

Pb lead 

PM particulate matter 

PM10 particulate matter less than 10 microns in size 

psi pounds per square inch 

scf standard cubic feet 

SIC Source Industrial Classification 

SO2 sulfur dioxide 

SOx oxides of sulfur 

tpy tons per year 

U.S.C. United States Code 

VE visible emissions 

VOC volatile organic compound 
OP2035-02 C-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Appendix C NOTIFICATION ADDRESSES 

Compliance Notifications: 

Montana Department of Environmental Quality 

Permitting and Compliance Division 

Air Resources Management Bureau 

P.O. Box 200901 

Helena, MT 59620-0901 

United States EPA 

Air Program Coordinator 

Region VIII, Montana Office 

10 W. 15th Street, Suite 3200 

Helena, MT 59626 

Permit Modifications: 

Montana Department of Environmental Quality 

Permitting and Compliance Division 

Air Resources Management Bureau 

P.O. Box 200901 

Helena, MT 59620-0901 

Office of Partnerships and Regulatory Assistance 

Air and Radiation Program 

US EPA Region VIII 8P-AR 

1595 Wynkoop Street 

Denver, CO 80202-1129 
OP2035-02 D-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Appendix D AIR QUALITY INSPECTOR INFORMATION 

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

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

1. Direction to Plant: Located approximately 6 miles north of Colstrip, Montana on Highway 39, 18 

Snider Subdivision Road. 

2. Safety Equipment Required:

The safety information listed below was contained in a document titled Plant Operating Procedures: 

Basis Safety Rules dated September 4, 1991 that was provided by CELP on September 25, 1996. 

Only safety information determined by the Department to be pertinent to State and/or federal air 

quality inspectors is contained in this appendix. 

1. Smoking is prohibited except in designated areas. 

2. Aisles and walkways shall be kept clear at all times. 

3. Climbing through machinery and equipment as a short-cut is prohibited. 

4. “Horseplay” shall not be tolerated in the plant. 

5. Long sleeve shirts shall be worn plant-wide except for the main office and parking lot. 

6. Loose or torn clothing, long hair, rings, or pendant jewelry shall not be worn around moving 

machinery. 

7. Thin-soled, badly worn, open-toed, or tennis shoes shall not be worn in the plant. Sturdy leather 

or safety boots are recommended. 

8. Safety glasses and hard hats are required except in office spaces, the control room, inside 

vehicles, shop buildings, and to and from the parking lot area. 

9. Appropriate eye and ear protection shall be worn as required. 

10. Respirators and dust masks shall be worn as required. 

11. Doors and barriers protecting live electrical equipment and switches shall not be opened except 

by authorized personnel and shall not be left open without proper safety barriers. 

12. Climbing on boxes, equipment, or structures not designated as a work area or means of access is 

prohibited. 

13. Safety belts or other adequate protection as required shall be used for work in elevated positions. 

14. Bins, empty tanks, or sealed spaces shall not be entered without adequate air supply, ventilation, 

and proper training in Confined Space Entry. 

15. A speed limit of 15 MPH is in force on the plant property at all times except in congested areas 

where the limit is reduced to 10 MPH. 
OP2035-02 D-2 Date of Decision: 11/24/09 

Effective Date: 12/25/09

3. Facility Plot Plan: The facility plot plan was submitted as part of the application submitted on June 

8, 1995. 
OP2035-02 E-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Appendix E Continuous Emission Monitoring Systems (CEMS) 

The following monitors shall be installed and operated on the boiler stack outlet: SO2, NOx, opacity, CO, 

and O2 or CO2. Said monitors shall comply with the applicable provisions of 40 CFR 60, Subpart Da 

60.47a; Subpart A, 60.7; Appendix B, Specifications 1, 2, 3 and 4; and Appendix F. The monitors shall 

also conform to, but not be limited to, the following: 

1. Continuous Opacity Monitoring System (COMS)

a. CELP shall install, calibrate, maintain, and operate COMS to monitor and record the 

opacity of the gases discharged into the atmosphere from the boiler. 

(1) The span of these systems shall be set at 100% opacity. 

(2) The COMS shall conform to all requirements of 40 CFR Part 60, Appendix B, 

Performance Specification 1 - Specifications and Test Procedures for Opacity 

Continuous Emission Monitoring Systems in Stationary Sources (PS1). 

(3) The COMS data will be used to demonstrate compliance with the 20% opacity 

limitation in Section III.E.1. CELP shall maintain compliance with the 20% 

opacity limitation, as demonstrated by the COMS. 

b. CELP shall submit a written report of all excess opacity emissions quarterly. Periods of 

excess emissions shall be defined as those averaged over a six-minute period for which 

the average is greater than 20% opacity. The report shall be in the format contained in 

Attachment 1 and include, as a minimum, the following: 

(1) The magnitude of excess emissions and the date and time of commencement and 

completion of each time period of excess emissions. 

(2) Specific identification of each period of excess emissions that occurs during 

startups, shutdowns, and malfunctions of the affected facility. The nature and 

cause of any malfunction (if known), the corrective action taken or preventative 

measures adopted. 

(3) The date and time identifying each period during which the COMS was 

inoperative except for zero and span checks. The nature of the system repairs or 

adjustments must also be reported. 

(4) When no excess emissions have occurred or the COMS have not been 

inoperative, repaired, or adjusted, such information shall be stated in the report. 

(5) The percentage of time the COMS was operating shall be calculated as follows: 

(1 - hours of COMS downtime during reporting period*

 ) x 100 

 hours the source operated during reporting period 

*

 All time required for calibration and to perform preventative 

maintenance must be included in COMS downtime. 

This shall be reported as percent monitor availability during plant 

operation. CELP shall maintain a minimum of 95% monitor availability 

during plant operation on a quarterly basis. 
OP2035-02 E-2 Date of Decision: 11/24/09 

Effective Date: 12/25/09

Nothing in this section shall preclude enforcement action for data 

availability that is less than 100% but equal to or greater than 95% if the 

conditions in Appendix E Section 5 are not satisfied. 

(6) The percentage of time the COMS indicated compliance. This shall be 

calculated as: 

(1 - total hours of excess emissions during reporting period ) x 100 

 total hours of COMS availability during reporting period 

This shall be reported as percent compliance. CELP shall maintain 

compliance with the 20% limitation, as demonstrated by the COMS in 

accordance with Section III.E.1. 

(7) The excess emission reports shall be submitted within 30 days following the end 

of the reporting period (January-March, April-June, July-September, and 

October-December). 

c. CELP shall inspect and audit the COMS quarterly, using neutral density filters. CELP 

shall conduct these audits using the appropriate procedures and forms in the EPA 

Technical Assistance Document: Performance Audit Procedures for Opacity Monitors 

(EPA-600/8-87-025, April 1987). The results of these inspections and audits shall be 

included in the quarterly excess emission report. 

d. CELP shall maintain a file of all measurements from the COMS performance testing 

measurements; all COMS performance evaluations; all COMS or monitoring device 

calibration checks and audits; adjustments and maintenance performed on these systems 

or devices recorded in a permanent form suitable for inspection. The file shall be 

retained on site for at least five years following the date of such measurements and 

reports. CELP shall supply these records to the Department upon request. 

2. Continuous Emission Monitoring System (CEMS) - SO2

a. CELP shall install, calibrate, maintain, and operate CEMS to monitor and record the 

sulfur dioxide (SO2) concentrations of the gases discharged into the atmosphere from the 

boiler. 

(1) The span of this system shall be set as required in 40 CFR 60.47a. 

(2) The CEMS shall conform to all requirements of 40 CFR Part 60 Subpart Da - 

Standards of Performance for Electric Utility Steam Generation Units; Appendix 

B, Performance Specification 2 - Specifications and Test Procedures for SO2 and 

NOx Continuous Emission Monitoring Systems in Stationary Sources (PS2); and 

Appendix F, Quality Assurance Procedures. 

(3) The CEMS data will be used to demonstrate compliance with the limitations 

contained in Section III.E.2 and III.E.4 CELP shall maintain compliance with 

the limitations, as demonstrated by the CEMS. 

b. CELP shall submit a written report of all excess emissions quarterly. Periods of excess 

emissions shall be defined as those emissions calculated on an hourly, 3-hour, calendar 

day, annual and rolling 30-day basis which are greater than the limitations. The report 

shall be in the format contained in Attachment 1 and including, as a minimum, the 

following: 
OP2035-02 E-3 Date of Decision: 11/24/09 

Effective Date: 12/25/09

(1) The magnitude of excess emissions and the date and time of commencement and 

completion of each time period of excess emissions. 

(2) Specific identification of each period of excess emissions that occurs during 

startups, shutdowns, and malfunctions of the affected facility. The nature and 

cause of any malfunction (if known), the corrective action taken or preventative 

measures adopted. 

(3) The date and time identifying each period during which the CEMS was 

inoperative except for zero and span checks. The nature of the system repairs or 

adjustments must also be reported. 

(4) When no excess emissions have occurred or the CEMS have not been 

inoperative, repaired, or adjusted, such information shall be stated in the report. 

(5) The percentage of time the CEMS was operating. This shall be calculated as 

(1 - hours of CEMS downtime during reporting period* ) x 100 

 hours the source operated during reporting period 

*

 All time required for calibration and to perform preventative 

maintenance must be included in CEMS downtime. 

This shall be reported as percent monitor availability during plant 

operation. CELP shall maintain a minimum of 95% monitor availability 

during plant operation on a quarterly basis. 

Nothing in this section shall preclude enforcement action for data 

availability that is less than 100%, but equal to or greater than 95% if the 

conditions in Appendix E Section 5 are not satisfied. 

(6) The percentage of time the CEMS indicated compliance. This shall be calculated 

as: 

(1 - total hours of excess emissions during reporting period ) x 100 

 total hours of CEMS availability during reporting period 

This shall be reported as percent compliance. CELP shall maintain 

compliance with the limitations, as demonstrated by the CEMS. 

(7) The excess emission reports shall be submitted within 30 days following the end 

of the reporting period (January-March, April-June, July-September, and 

October-December). 

c. CELP shall inspect and audit the CEMS quarterly to meet the requirement contain in 40 

CFR Part 60 Appendix F. CELP shall conduct these audits using the appropriate 

procedures. The results of these inspections and audits shall be included in the quarterly 

excess emission report. 

d. CELP shall maintain a file of all measurements from the CEMS and performance testing 

measurements; all CEMS performance evaluations; all CEMS or monitoring device 

calibration checks and audits; adjustments and maintenance performed on these systems 

or devices recorded in a permanent form suitable for inspection. The file shall be 

retained on site for at least five years following the date of such measurements and 

reports. CELP shall supply these records to the Department upon request. 
OP2035-02 E-4 Date of Decision: 11/24/09 

Effective Date: 12/25/09

3. Continuous Emission Monitoring System (CEMS) – NOx

a. CELP shall install, calibrate, maintain, and operate continuous emissions monitoring 

systems (CEMS) to monitor and record the nitrogen oxide (NOx) concentrations of the 

gases discharged into the atmosphere from the boiler. 

(1) The span of this system shall be set at 1,000 ppm. 

(2) The CEMS shall conform to all requirements of 40 CFR Part 60, Appendix B, 

Performance Specification 2 - Specifications and Test Procedures for SO2 and 

NOx Continuous Emission Monitoring Systems in Stationary Sources (PS2) and 

Appendix F, Quality Assurance Procedures. 

(3) The CEMS data will be used to demonstrate compliance with the limitations 

contained in Section III.E.2. CELP shall maintain compliance with the 

limitations, as demonstrated by the CEMS. 

b. CELP shall submit a written report of all excess emissions quarterly. Periods of excess 

emissions shall be defined as those emissions calculated on an hourly, calendar day, and 

annual basis which are greater than the limitations. The report shall be in the format 

contained in Attachment 1 and including, as a minimum, the following: 

(1) The magnitude of excess emissions and the date and time of commencement and 

completion of each time period of excess emissions. 

(2) Specific identification of each period of excess emissions that occurs during 

startups, shutdowns, and malfunctions of the affected facility. The nature and 

cause of any malfunction (if known), the corrective action taken or preventative 

measures adopted. 

(3) The date and time identifying each period during which the CEMS was 

inoperative except for zero and span checks. The nature of the system repairs or 

adjustments must also be reported. 

(4) When no excess emissions have occurred or the CEMS have not been 

inoperative, repaired, or adjusted, such information shall be stated in the report. 

(5) The percentage of time the CEMS was operating. This shall be calculated as 

(1 - hours of CEMS downtime during reporting period* ) x 100 

 hours the source operated during reporting period 

*

 All time required for calibration and to perform preventative 

maintenance must be included in CEMS downtime. 

This shall be reported as percent monitor availability during plant 

operation. CELP shall maintain a minimum of 95% monitor availability 

during plant operation on a quarterly basis. 

Nothing in this section shall preclude enforcement action for data 

availability that is less than 100% but equal to or greater than 95% if the 

conditions in Appendix E Section 5 are not satisfied. 
OP2035-02 E-5 Date of Decision: 11/24/09 

Effective Date: 12/25/09

(6) The percentage of time the CEMS indicated compliance. This shall be 

calculated as: 

(1 - total hours of excess emissions during reporting period ) x 100 

 total hours of CEMS availability during reporting period 

This shall be reported as percent compliance. CELP shall maintain 

compliance with the limitations, as demonstrated by the CEMS. 

(7) The excess emission reports shall be submitted within 30 days following the end 

of the reporting period (January-March, April-June, July-September, and 

October-December). 

c. CELP shall inspect and audit the CEMS quarterly using Certified Gas Audits or Relative 

Accuracy Audits (RAA). CELP shall conduct these audits using the appropriate 

procedures. The results of these inspections and audits shall be included in the quarterly 

excess emission report. 

d. CELP shall maintain a file of all measurements from the CEMS and performance testing 

measurements; all CEMS performance evaluations; all CEMS or monitoring device 

calibration checks and audits; adjustments and maintenance performed on these systems 

or devices recorded in a permanent form suitable for inspection. The file shall be 

retained on site for at least five years following the date of such measurements and 

reports. CELP shall supply these records to the Department upon request. 

4. Continuous Emission Monitoring System (CEMS) - CO and O2 or CO2

a. CELP shall install, calibrate, maintain, and operate CEMS to monitor and record CO and 

O2 or CO2 of the gases discharged into the atmosphere from the boiler. 

(1) The CEMS shall conform to all requirements of 40 CFR Part 60 Subpart Da - 

Standards of Performance for Electric Utility Steam Generation Units; 

Appendix B, Performance Specification 3 - Specifications and Test Procedures 

for O2 and CO2 Continuous Emission Monitoring Systems in Stationary Sources 

(PS3) and Performance Specification 4 -Specifications and Test Procedures for 

CO Continuous Emission Monitoring Systems in Stationary Sources (PS4); and 

Appendix F, Quality Assurance Procedures. 

(2) The CEMS shall conform to all requirements of 40 CFR 60.47a. 

5. In addition to complying with the minimum quarterly data recovery rates specified in Appendix 

E, CELP shall undertake its best efforts to strive for and achieve the highest average quarterly 

data recovery rate which is practical. The determination of what is practical and, therefore, 

acceptable data loss shall be made consistent with Appendix E Section 6. 

6. In regards to quarterly data recovery rate requirements specified in Appendix E, the determination 

of what is practical and, therefore, acceptable data loss shall consider whether: 

a. CELP has properly operated and maintained the continuous emission monitors and 

associated data acquisition systems, including the performance of preventative 

maintenance, the maintenance of the spare parts inventory and the conduct of the quality 

assurance requirements. 
OP2035-02 E-6 Date of Decision: 11/24/09 

Effective Date: 12/25/09

b. CELP has taken immediate and appropriate action to correct a malfunction in the 

continuous emission monitors and associated data acquisitions systems. 
OP2035-02 E-7 Date of Decision: 11/24/09 

Effective Date: 12/25/09

 ATTACHMENT 1 

INSTRUCTIONS FOR COMPLETING EXCESS EMISSIONS 

AND MONITORING SYSTEMS REPORTS (EER) 

PART 1 Complete as shown. 

PART 2 Complete as shown. Report total time the point source operated during the reporting period in 

hours. The determination of point source operating time includes time during unit startup, 

shutdown, malfunctions, or whenever pollutants (of any magnitude) are generated, regardless of 

unit condition or operating load. 

Percent of time CEMS was available during point source operation is to be determined as: 

( 1 - (CEMS downtime in hours during reporting period*

) ) x 100 

 (total hours of point source operation during reporting period) 

*

 All time required for calibration and to perform preventative maintenance must be included in 

COMS downtime. 

Excess emissions include all time periods when emissions as measured by the CEMS exceed 

any applicable emission standard for any applicable time period. 

Percent of time in compliance is to be determined as: 

( 1 - (total hours of excess emissions during reporting period) ) x 100 

 (total hours of CEMS availability during reporting period) 

PART 3 Complete a separate sheet for each pollutant control device associated with a CEMS. Be 

specific when identifying control equipment operating parameters. For example: primary and 

secondary amps and spark rate for ESPs; pressure drop and effluent temperature for baghouses; 

and liquid flow rate and pH levels for scrubbers. For the initial EER, include a diagram or 

schematic for each piece of control equipment. 

Table I Use Table I as a guideline to report all excess emissions. Complete a separate sheet for each 

CEMS. Sequential numbering of each excess emission is recommended. For each excess 

emission, indicate: 1) time, duration and magnitude, 2) nature and cause, and 3) the action 

taken to correct the condition of excess emissions. Do not use computer reason codes for 

corrective actions or nature and cause, rather, be specific in the explanation. If no excess 

emissions occur during the reporting period, it must be stated so. 

Table II Use Table II as a guideline to report all CEMS upsets or malfunctions. Complete a separate 

sheet for each CEMS. List the time, duration, nature and extent of problems, as well as the 

action taken to return the CEMS to proper operation. Do not use reason codes for nature, 

extent or corrective actions. Include normal calibrations and maintenance as prescribed by 

the CEMS manufacturer. Do not include zero and span checks. 

Table III Complete a separate sheet for each pollutant control device associated with a CEMS. Use 

Table III as a guideline to report operating status of control equipment during the excess 

emission. Follow the number sequence as recommended for excess emissions reporting. 

Report operating parameters consistent with Part 3, Subpart F. 
OP2035-02 E-8 Date of Decision: 11/24/09 

Effective Date: 12/25/09

EXCESS EMISSIONS AND MONITORING SYSTEMS REPORT 

PART 1

a. Emission Reporting Period ______________________________________________________ 

b. Report Date 

___________________________________________________________________ 

c. Person Completing Report ______________________________________________________ 

d. Plant Name 

____________________________________________________________________ 

e. Plant Location _________________________________________________________________ 

f. Person Responsible for Review 

and Integrity of Report 

___________________________________________________________ 

g. Mailing Address for 1.f. _________________________________________________________ 

 Street Address or P.O. Box 

_____________________________________________________________________________ 

City State Zip Code 

h. Phone Number of 1.f. ___________________________________________________________ 

i. Certification for Report Integrity, by person in 1.f. 

THIS IS TO CERTIFY THAT THE INFORMATION PROVIDED IN THIS REPORT IS 

COMPLETE AND ACCURATE. 

SIGNATURE 

___________________________________________________________________ 

NAME 

_________________________________________________________________________ 

TITLE 

_________________________________________________________________________ 

DATE __________________________________________________________________ 

j. Comments 

________________________________________________________________________________ 

________________________________________________________________________________ 

________________________________________________________________________________ 

________________________________________________________________________________ 
OP2035-02 E-9 Date of Decision: 11/24/09 

Effective Date: 12/25/09

PART 2 - CEMS Information: Complete for each CEMS. 

a. Point Source __________________________________________________________ 

b. CEMS Type (circle one) 

Opacity SO2 NOx O2 CO CO2 TRS 

c. Manufacturer __________________________________________________________ 

d. Model No. _____________________ e. Serial No. _______________________ 

e. Automatic Calibration Value: Zero _______________ Span ______________ 

f. Date of Last CEMS Performance Test ____________________________________ 

g. Total Time Point Source Operated During Reporting Period ______________ 

h. Percent of Time CEMS Was Available During Point Source Operation: _____ 

Show calculations ____________________________________________________ 

_______________________________________________________________________ 

i. Allowable Emission Rate _______________________________________________ 

j. Percent of Time in Compliance _________________________________________ 

Show calculations ____________________________________________________ 

_______________________________________________________________________ 

k. CEMS Repairs or Replaced Components Which Affected or Altered Calibration Values 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 
OP2035-02 E-10 Date of Decision: 11/24/09 

Effective Date: 12/25/09

PART 3 - Pollution Control Equipment Operating Parameter Monitor. (Complete one sheet for each 

pollutant control device associated with a CEMS.) 

a. Point source _________________________________________________________ 

b. Pollutant (circle one): 

Opacity Particulate SO2 NOx TRS 

c. Type of Control Equipment _____________________________________________ 

d. Control Equipment Description and Identification (Model # and Serial #) 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

e. Control Equipment Operating Parameters (i.e., pressure drop [delta P], 

effluent temperature, scrubber water flow rate and pH levels, primary 

and secondary amps, spark rate) _______________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

f. Date of Control Equipment Performance Test ____________________________ 

g. Control Equipment Operating Parameter During Performance Test _________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

_______________________________________________________________________ 

h. Type and Amount of Material Produced or Processed During the Reporting 

Period ________________________________________________________________ 

i. Type and Amount of Fuel Used During the Reporting Period ______________ 

_______________________________________________________________________ 
OP2035-02 E-11 Date of Decision: 11/24/09 

Effective Date: 12/25/09

 TABLE I 

 EXCESS EMISSIONS1

 Time Explanation/ 

Date From To Duration Cause Magnitude Corrective Action

 

 1This should include the following: 

1. Duration of excess emission in reporting period due to: 

a. Startup/shutdown. 

b. Control equipment problems. 

c. Process problems. 

d. Other known causes. 

e. Unknown causes. 

2. Total duration of excess emissions. 

3. Total duration of excess emissions x (100)

Total Source Operating Time 
OP2035-02 E-12 Date of Decision: 11/24/09 

Effective Date: 12/25/09

 TABLE II 

CONTINUOUS MONITORING SYSTEM OPERATION FAILURES2

 Time Problem/ 

Date From To Duration Cause Corrective Action

 

 2This shall include the following: 

1. CMS downtime in reporting period due to: 

a. Monitor equipment malfunctions. 

b. Non-Monitor equipment malfunctions. 

c. Quality assurance calibrations. 

d. Other known causes. 

e. Unknown causes. 

2. Total CMS Downtime. 

3. Total CMS downtime x 100

Total source operating time 
OP2035-02 E-13 Date of Decision: 11/24/09 

Effective Date: 12/25/09

 TABLE III 

CONTROL EQUIPMENT OPERATION DURING EXCESS EMISSIONS 

 Time Operating 

Date From To Duration Parameters Corrective Action
OP2035-02 F-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

APPENDIX F CAM PLAN – CIRCULATING FLUIDIZED BED BOILER, PARTICULATE 

MATTER CONTROL 

Monitoring Approach 

I. Indicator Baghouse exit stream opacity and baghouse differential 

pressure. 

II. Measurement Approach A Continuous Opacity Monitoring System (COMS) on the 

baghouse exit stream includes 1-hour average opacity 

readings which are recorded by the data acquisition system 

(DAS). In addition, the difference between the outlet 

pressures on the baghouse is monitored continuously on a 

paperless stripchart. Operators log the pressure differential 

hourly. 

III. Indicator Value An opacity spike greater than 10 percent for longer than one 

hour duration triggers baghouse inspection, which may 

include a dye check to identify the damaged bag and bag 

replacement. 

The minimum accuracy of the pressure differential is 0.19 

inches water pressure. 

Alarms on both opacity and pressure differential, the chart 

and local pressure gauges providing instantaneous readings. 

The opacity meter is calibrated daily and drift tests are 

conducted quarterly. 

Opacity is continuously monitored and recorded by the 

DAS. Pressure differential is also monitored continuously 

on a paperless stripchart; additionally, readings are logged 

each hour. Data are stored in the plant archive for five 

years. 

A COMS measures opacity continuously and the DAS 

records 6-minute averages. A stripchart records differential 

pressure continuously and operators log the values hourly. 

IV. Performance Criteria 

 A. Data Representativeness 

 B. Verification of Operational Status 

 

C. QA/QC Practices and Criteria 

 

D. Monitoring Frequency 

 

E. Data Collection Procedures 

 

F. Averaging period 

 

Opacity – 1-hour averages. 

Differential pressure – daily. 

Although the complete hard copy of Appendix G is not included in the permit, the contents of Appendix G, CELP’s 

CAM plan remain as applicable requirements as stated in the Title V Operating Permit #OP2035-01. To receive a 

hard copy of this appendix, please contact one of the following: 

The Department of Environmental Quality 

Permitting and Compliance Division 

Air Resources Management Bureau 

1520 E. Sixth Ave. 

P.O. Box 200901 

Helena, Montana 59620-0901 

Bureau Phone (406) 444-3490 

OR 

Colstrip Energy Limited Partnership 

1087 W. River St., Suite 200 

Boise, ID 83702 

Phone (208) 344-3570
OP2035-02 G-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

APPENDIX G CAM PLAN – CIRCULATING FLUIDIZED BED BOILER, SULFUR DIOXIDE 

CONTROL 

Monitoring Approach 

I. Indicator Exit stream SO2 concentration 

II. Measurement Approach A CEMS on the boiler exit stream includes continuous SO2 

concentration readings which are used to control the amount 

of limestone added. 

III. Indicator Value The exit stream concentration is maintained at 0.59 lbs 

SO2/MMBtu heat input. 

Same measurement as used to meet emission limits. 

CEMS data. 

Daily calibration drift check of CEMS and quarterly cylinder 

gas audit. 

Continuous. 

CEMS automatically records exit stream concentrations. 

IV. Performance Criteria 

 A. Data Representativeness 

 B. Verification of Operational Status 

 

C. QA/QC Practices and Criteria 

 

D. Monitoring Frequency 

 

E. Data Collection Procedures 

 

F. Averaging period 

 1 hour. 

Although the complete hard copy of Appendix H is not included in the permit, the contents of Appendix H, 

CELP’s CAM plan remain as applicable requirements as stated in the Title V Operating Permit #OP2035-01. 

To receive a hard copy of this appendix, please contact one of the following: 

The Department of Environmental Quality 

Permitting and Compliance Division 

Air Resources Management Bureau 

1520 E. Sixth Ave. 

P.O. Box 200901 

Helena, Montana 59620-0901 

Bureau Phone (406) 444-3490 

OR 

Colstrip Energy Limited Partnership 

1087 W. River St., Suite 200 

Boise, ID 83702 

Phone (208) 344-3570
OP2035-02 H-1 Date of Decision: 11/24/09 

Effective Date: 12/25/09

APPENDIX H MEMS 

MEMS

a. CELP shall install, calibrate, certify, maintain, and operate an MEMS to monitor and record the 

rate of mercury emissions discharged into the atmosphere from all mercury emitting generating 

units (units) as defined in ARM 17.8.740. 

(1) The MEMS shall be comprised of equipment as required in 40 CFR 75.81(a) and defined in 

40 CFR 72.2. 

(2) The MEMS shall conform to all applicable requirements of 40 CFR Part 75. 

(3) The MEMS data will be used to demonstrate compliance with the emission limitations 

contained in Section II.A.22. 

b. CELP shall prepare, maintain and submit a written MEMS Monitoring Plan to the Department. 

(1) The monitoring plan shall contain sufficient information on the MEMS and the use of data 

derived from these systems to demonstrate that all the gaseous mercury stack emissions from 

each unit are monitored and reported. 

(2) Whenever CELP makes a replacement, modification, or change in a MEMS or alternative 

monitoring system under 40 CFR 75 subpart E, including a change in the automated data 

acquisition and handling system (DAHS) or in the flue gas handling system, that affects 

information reported in the monitoring plan (e.g. a change to a serial number for a component 

of a monitoring system), then the owner or operator shall update the monitoring plan. 

(3) If any monitoring plan information requires an update pursuant to Section b.(2), submission 

of the written monitoring plan update shall be completed prior to or concurrent with the 

submittal of the quarterly report required in c. below for the quarter in which the update is 

required. 

(4) The initial submission of the Monitoring Plan to the Department shall include a copy of a 

written Quality Assurance/Quality Control (QA/QC) Plan as detailed in 40 CFR 75 Appendix 

B, Section 1. Subsequently, the QA/QC Plan need only be submitted to the Department when 

it is substantially revised. Substantial revisions can include items such as changes in QA/QC 

processes resulting from rule changes, modifications in the frequency or timing of QA/QC 

procedures, or the addition/deletion of equipment or procedures. 

(5) The Monitoring Plan shall include, at a minimum, the following information: 

(a) Facility summary including: 

(i) A description of each mercury emitting generating unit at the facility. 

(ii) Maximum and average loads (in megawatts (MW)) with fuels combusted and fuel 

flow rates at the maximum and average loads for each unit. 

(iii) A description of each unit’s air pollution control equipment and a description of the 

physical characteristics of each unit’s stack. 

(b) Mercury emission control summary including a description of control strategies, 

equipment, and design process rates. 
OP2035-02 H-2 Date of Decision: 11/24/09 

Effective Date: 12/25/09

(c) MEMS description, including: 

(i) Identification and description of each monitoring component in the MEMS including 

manufacturer and model identifications; monitoring method descriptions; and normal 

operating scale and units descriptions. Descriptions of stack flow, diluent gas, and 

moisture monitors (if used) in the system must be described in addition to the 

mercury monitor or monitors. 

(ii) A description of the normal operating process for each monitor including a 

description of all QA/QC checks. 

(iii) A description of the methods that will be employed to verify and maintain the 

accuracy and precision of the MEMS calibration equipment. 

(iv) Identification and description of the DAHS, including major hardware and software 

components, conversion formulas, constants, factors, averaging processes, and 

missing data substitution procedures. 

(v) A description of all initial certification and ongoing recertification tests and 

frequencies; as well as all accuracy auditing tests and frequencies. 

(d) The Maximum Potential Concentration (MPC), Maximum Expected Concentration 

(MEC), span value, and range value as applicable and as defined in 40 CFR 75 Appendix 

A, 2.1.7. 

(e) Examples of all data reports required in c. below. 

c. CELP shall submit written, Quarterly Mercury Monitoring Reports. The reports shall be received 

by the Department within 30 days following the end of each calendar quarter, and shall include, at 

a minimum, the following: 

(1) Mercury emissions. The reports shall include: 

(a) The monthly average lb/TBtu mercury emission rate for each month of the quarter; 

(b) The 12-month rolling average lb/TBtu emission rate for each month of the reporting 

quarter. The rolling 12-month basis is an average of the last 12 individual calendar 

monthly averages, with each monthly average calculated at the end of each calendar 

month; and 

(c) The total heat input to the boiler (in TBtu) for each 12-month rolling period of the 

quarter. 

(2) Mercury excess emissions. The report shall describe the magnitude of excess mercury 

emissions experienced during the quarter, including: 

(a) The date and time of commencement and completion of each period of excess emissions. 

Periods of excess emissions shall be defined as those emissions calculated on a rolling 

12-month basis, which are greater than the limitation established in II.A.22. 

(b) The nature and cause of each period of excess emissions and the corrective action taken 

or preventative measures adopted in response. 
(c) If no periods of excess mercury emissions were experienced during the quarter, the report 

shall state that information. 

(3) MEMS performance. The report shall describe: 

(a) The number of operating hours that the MEMS was unavailable or not operating within 

quality assurance limits (monitor downtime) during the reporting quarter, broken down 

by the following categories: 

• Monitor equipment malfunctions; 

• Non-Monitor equipment malfunctions; 

• Quality assurance calibration; 

• Other known causes; and 

• Unknown causes. 

(b) The percentage of unit operating time that the MEMS was unavailable or not operating 

within quality assurance limits (monitor downtime) during the reporting quarter. The 

percentage of monitor downtime in each calendar quarter shall be calculated according to 

the following formula: 

% ×100 ⎟

⎟

⎠

⎞

⎜

⎜

⎝

⎛ = OpHours

MEMSDownHours MEMSDowntime where 

MEMSDowntime% = Percentage of unit operating hours classified as MEMS 

 monitor downtime during the reporting quarter. 

MEMSDownHours = Total number of hours of MEMS monitor downtime 

 during the reporting quarter. 

OpHours = Total number of hours the unit operated during the 

 reporting quarter. 

(c) For any reporting quarter in which monitor downtime exceeds 10%, a description of each 

time period during which the MEMS was inoperative or operating in a manner defined in 

40 CFR Part 75 as “out of control.” Each description must include the date, start and end 

times, total downtime (in hours), the reason for the system downtime, and any necessary 

corrective actions that were taken. In addition, the report shall describe the values used 

for any periods when missing data substitution was necessary as detailed in 40 CFR 

75.30, et seq. 

(4) The quarterly report shall include the results of any QA/QC audits, checks, or tests conducted 

to satisfy the requirements of 40 CFR Part 75 Appendices A, B or K. 

(5) Compliance certification. Each quarterly report shall contain a certification statement signed 

by the facility’s responsible official based on reasonable inquiry of those persons with 

primary responsibility for ensuring that all of the unit's emissions are correctly and fully 

monitored. The certification shall indicate: 

OP2035-02 H-3 Date of Decision: 11/24/09 

Effective Date: 12/25/09
OP2035-02 H-4 Date of Decision: 11/24/09 

Effective Date: 12/25/09

(a) Whether the monitoring data submitted were recorded in accordance with the applicable 

requirements of 40 CFR Part 75 including the QA/QC procedures and specifications of 

that part and its appendices, and any such requirements, procedures and specifications of 

an applicable excepted or approved alternative monitoring method as represented in the 

approved Monitoring Plan. 

(b) That for all hours where data are substituted in accordance with 40 CFR 75.38, the addon mercury emission controls were operating within the range of parameters listed in the 

quality-assurance plan for the unit, and that the substitute values do not systematically 

underestimate mercury emissions. 

(6) The format of each component of the quarterly report may be negotiated with the 

Department’s representative to accommodate the capabilities and formats of the facility’s 

DAHS. 

(7) Each quarterly report must be received by the Department within 30 days following the end 

of each calendar reporting period (January-March, April-June, July-September, and OctoberDecember). 

(8) The electronic data reporting detailed in 40 CFR Part 75 shall not be required unless Montana 

is able to receive and process data in an electronic format. 

d. CELP shall maintain a file of all measurements and performance testing results from the MEMS; all 

MEMS performance evaluations; all MEMS or monitoring device calibration checks and audits; and 

records of all adjustments and maintenance performed on these systems or devices recorded in a 

permanent form suitable for inspection. The file shall be retained on site for at least 5 years following 

the date of such measurements and reports. CELP shall make these records available for inspection 

by the Department and shall supply these records to the Department upon request.