United States Environmental Protection Agency 

Region 8 

Air Program 

1595 Wynkoop Street 

Denver, Colorado 80202 

AIR POLLUTION CONTROL
 

TITLE V PERMIT TO OPERATE
 

In accordance with the provisions oftitle V ofthe Clean Air Act and 40 CFR Part 71 and applicable 

rules and regulations, 

Public Service Company of Colorado
 

Tiffany Compressor Station
 

is authorized to operate air emission units and to conduct other air pollutant emitting activities in 

accordance with the pennit conditions listed in this pennit. 

This source is authorized to operate at the following location: 

Section 3, Township 32N, Range 6W
 

on the Southern Ute Indian Reservation
 

Tenns not otherwise defined in this pennit have the meaning assigned to them in the referenced 

regulations. All tenns and conditions of the pennit are enforceable by EPA and citizens under the Clean 

Air Act. 

Deborah Lebow Aal, Acting Director 

Air Program 

US EPA Region 8 
PAGE LEFT INTENTIONALLY BLANK 
AIR POLLUTION CONTROL 

TITLE V PERMIT TO OPERATE

Public Service Company of Colorado 

 Tiffany Compressor Station 

Permit Number: V-SU-00023-2010.00 Issue Date: May 9, 2011 

Replaces Permit No.: V-SU-0023-05.02 Effective Date: May 18, 2011 

Expiration Date: May 18, 2016 

The permit number cited above should be referenced in future correspondence regarding this facility. 

Permit Action History

DATE OF 

ACTION 

TYPE OF 

ACTION 

SECTION 

NUMBER, 

DESCRIPTION OF ACTION 

November 2000 Initial Permit Issued Permit #V-SU-0023-00.00 

December 2005 1st Renewal Permit 

Issued 

 Permit #V-SU-0023-05.00 (two modifications) 

 Permit #V-SU-0023-05.01 (minor modification) 

 Permit #V-SU-0023-05.02 (administrative amendment) 

May 2011 2nd Renewal Permit 

Issued 

 Permit #V-SU-00023-2010.00 
i 

TABLE OF CONTENTS 

Abbreviations and Acronyms .................................................................................................................. ii

LIST OF TABLES .................................................................................................................................. iii

I. Source Information and Emission Unit Identification ..................................................................... 1

A. General Source Information .......................................................................................................... 1

B. Source Emission Points .................................................................................................................. 2

II. Facility-Wide Requirements .............................................................................................................. 4

A. General Recordkeeping Requirements ......................................................................................... 4

B. Alternative Operating Scenarios ................................................................................................... 4

C. Stratospheric Ozone and Climate Protection .............................................................................. 5

D. Permit Shield ................................................................................................................................... 5

III. Part 71 Administrative Requirements ............................................................................................ 6

A. Annual Fee Payment ...................................................................................................................... 6

B. Annual Emissions Inventory.......................................................................................................... 8

C. Compliance Requirements ............................................................................................................. 9

D. Duty to Provide and Supplement Information .......................................................................... 10

E. Submissions ................................................................................................................................... 11

F. Severability Clause........................................................................................................................ 11

G. Permit Actions .............................................................................................................................. 11

H. Administrative Permit Amendments .......................................................................................... 11

I. Minor Permit Modifications ......................................................................................................... 12

J. Group Processing of Minor Permit Modifications ..................................................................... 14

K. Significant Permit Modifications ................................................................................................ 15

L. Reopening for Cause .................................................................................................................... 15

M. Property Rights ............................................................................................................................ 16

N. Inspection and Entry .................................................................................................................... 16

O. Emergency Provisions .................................................................................................................. 16

P. Transfer of Ownership or Operation .......................................................................................... 17

Q. Off Permit Changes ...................................................................................................................... 17

R. Permit Expiration and Renewal .................................................................................................. 20

IV. Appendices to the Part 71 Permit ................................................................................................... 21

A. Inspection Information ................................................................................................................ 21
ii

Abbreviations and Acronyms

AR Acid Rain 

ARP Acid Rain Program 

bbls Barrels 

BACT Best Available Control Technology 

CAA Clean Air Act [42 U.S.C. Section 7401 et seq.]

CAM Compliance Assurance Monitoring 

CEMS Continuous Emission Monitoring System 

CFR Code of Federal Regulations 

CH2O Formaldehyde 

CMS Continuous Monitoring System (includes COMS, CEMS, and diluents monitoring) 

COMS Continuous Opacity Monitoring System 

CO Carbon monoxide 

CO2

 Carbon dioxide 

DAHS Data Acquisition and Handling System 

dscf Dry standard cubic foot 

dscm Dry standard cubic meter 

EIP Economic Incentives Programs 

EPA Environmental Protection Agency 

FGD Flue gas desulfurization 

gal gallon 

GPM Gallons per minute 

H2S Hydrogen Sulfide 

HAP Hazardous Air Pollutant 

hr hour 

Id. Identification number 

kg kilogram 

lb pound 

MACT Maximum Achievable Control Technology 

MVAC Motor Vehicle Air Conditioner 

Mg Megagram 

MMBtu Million British Thermal Units 

mo Month 

NESHAP National Emission Standards for Hazardous Air Pollutants 

NMHC Non-methane hydrocarbons 

NOx Nitrogen oxides 

NSPS New Source Performance Standard 

NSR New Source Review 

pH Negative logarithm of effective hydrogen ion concentration (acidity) 

PM Particulate Matter 

PM10 Particulate Matter less than 10 microns in diameter 

ppm Parts per million 

PSD Prevention of Significant Deterioration 

PTE Potential to emit 

psi Pounds per square inch 

psia pounds per square inch absolute 

RICE Reciprocating internal combustion engine 

RMP Risk Management Plan 

scfm Standard cubic feet per minute 

SNAP Significant New Alternatives Program 

SO2

 Sulfur Dioxide 

tpy Tons per year 

US EPA United States Environmental Protection Agency 

VOC Volatile Organic Compounds 
iii

LIST OF TABLES

Table 1. Emission Units.......................................................................................2 

Table 2. Insignificant Emission Units .......................................................................3 

 
1 

I. Source Information and Emission Unit Identification 

I.A. General Source Information

Parent Company Name: Public Service Company of Colorado 

Plant Name: Tiffany Compressor Station 

Plant Location: Section 4, T32N, R6W 

1213 County Road 330, Ignacio, Colorado 

Region: 8 

State: Colorado 

County: La Plata 

Reservation: Southern Ute Indian Reservation 

Tribe: Southern Ute Indian Tribe 

Responsible Official: Vice President System Design, Operation, and Maintenance 

SIC Code: 4922 

AFS Plant Identification Number: 08-067-00158 

Other Clean Air Act Permits: There are no other Federal CAA permits, such as minor NSR or PSD 

issued to this facility.
2

Description of Process: 

The Tiffany Compressor Station conditions natural gas to pipeline quality for delivery to PSCo 

customers. The facility compresses natural gas using three compression engines and removes water 

from the gas stream (dehydration) with three triethylene glycol (TEG) dehydrators. The natural gas is

then odorized and delivered into a PSCo pipeline that provides natural gas to Pagosa Springs, the San 

Luis Valley, and other PSCo mountain customers. This source is classified as a natural gas transmission 

facility defined under Standard Industrial Classification 4922. The facility does not extract natural gas 

liquids (NGLs) from field gas, nor fractionate mixed NGL to natural gas products. 

Air pollutant emissions are primarily from three internal combustion engines which drive the 

compressors, and from the three TEG dehydration units. All engines are White Superior model 8G825 

4-cycle engines, fired only on natural gas, site rated at 660 horsepower (hp) each, and exhaust 

individually to the atmosphere. Dehydrator units D001, D002 and D003 have the potential to emit 

VOCs and HAPs, including benzene, toluene, xylene and n-hexane from their still vents. 

I.B. Source Emission Points

The following table identifies and describes each emissions unit, such as process units and control 

devices. 

Table 1 - Emission Units

Public Service Company of Colorado 

Tiffany Compressor Station 

Emission Unit 

Id. 

Description Control 

Equipment 

E001 

E002 

E003 

Three White Superior model 8G825 Compressor 

Engines, 660 bhp, natural gas fired 

serial no. 21086, installed 11/15/74 

serial no. 268139, installed 1/1/77 

serial no. 274239, installed 1/1/80 

None 

None 

None 

D001 

D002 

D003 

Two 0.58 mmscf/hr Triethylene Glycol Dehydrators, 

manufactured by Production Equipment Corporation 

contactor tower serial number: 1006, installed 1974 

contactor tower serial number: 1065, installed 1974 

One 0.17 mmscf/hr Triethylene Glycol Dehydrator, 

manufactured by J. W. Williams 

contactor tower serial number: 997, installed 2003

None 

None 

None 
3

The following table identifies and describes the insignificant activities/emission units at the source. 

Table 2 - Insignificant Emission Units 

Public Service Company of Colorado 

Tiffany Compressor Station 

Description 

2 - Glycol reboiler burners for units D001 and D002, rated at 0.625 

mmBtu/hr 

Glycol reboiler burner for unit D003, rated at 0.35 mmBtu/hr 

2 – 500 gallon triethylene glycol above ground storage tanks 

1,057 gallon ethylene glycol coastal 50 coolant above ground tank 

35 kW Generac emergency generator 

5 – separator radiant heaters, rated at 0.025 mmBtu/hr (total) 

1,100 gallon oil tank 

560 gallon used oil underground tank 

2,000 gallon water/oil tank 

Elastec Inc. Smart Ash Burner 

Two window-mounted air conditioning units 
4

II. Facility-Wide Requirements 

Conditions in this section of the permit apply to all emissions units located at the facility, 

including any units not specifically listed in Table 1 and Table 2 of Section I.B. 

 [40 CFR 71.6(a)(1)] 

II.A. General Recordkeeping Requirements [40 CFR 71.6(a)(3)(ii) and 63.10(b)(3)] 

The permittee shall comply with the following generally applicable recordkeeping requirements: 

1. If the permittee determines that his or her stationary source that emits (or has the potential 

to emit, without considering controls) one or more HAPs is not subject to a relevant 

standard or other requirement established under 40 CFR part 63, the permittee shall keep 

a record of the applicability determination on site at the Operations Center for a period of 

five years after the determination, or until the source changes its operations to become an 

affected source, whichever comes first. The record of the applicability determination 

shall include an analysis (or other information) that demonstrates why the permittee 

believes the source is unaffected (e.g., because the source is an area source). The analysis 

(or other information) shall be sufficiently detailed to allow the Administrator to make a 

finding about the source’s applicability status with regard to the relevant standard or other 

requirement. If relevant, the analysis shall be performed in accordance with requirements 

established in subparts of 40 CFR part 63 for this purpose for particular categories of 

stationary sources. If relevant, the analysis should be performed in accordance with EPA 

guidance materials published to assist sources in making applicability determinations 

under section 112, if any. 

2. Records shall be kept, as required by Section III.Q. of this permit, of off permit changes 

that are made in accordance with the approved Alternative Operating Scenarios in 

Section II.B. 

II.B. Alternative Operating Scenarios [40 CFR 71.6(a)(9)]

Engine Replacement/Overhaul 

1. Replacement of an existing permitted engine with an engine of the same make, model, 

horsepower rating, and configured to operate in the same manner as the engine being 

replaced, and which satisfies all of the provisions for off permit changes, including the 

provisions specific to engine replacement, shall be considered an allowed alternative 

operating scenario under this permit. 

2. Any emission limits, requirements, control technologies, or provisions that apply to 

engines that are replaced under this Alternative Operating Scenarios section shall also 

apply to the replacement engines. A replacement engine shall be considered a new unit 

and thus subject to any initial compliance testing and all other conditions applicable to the 

engine. 
5

3. Replacement of an existing permitted engine with an engine subject to 

40 CFR part 60, subpart IIII is not an allowed alternative operating scenario. 

4. Replacement of an existing permitted engine with an engine subject to 

40 CFR part 60, subpart JJJJ is not an allowed alternative operating scenario. 

5. Replacement of an existing permitted engine not subject to 40 CFR part 63, subpart 

ZZZZ with an engine subject to 40 CFR part 63, subpart ZZZZ is not an allowed 

alternative operating scenario. 

[Explanatory Note: This section was included to allow for off permit replacement of engines 

that may have existing federally enforceable limits. For replacement engines which trigger new 

applicable requirements (i.e., NSPS, NESHAP, etc.), the minor permit modification process shall 

be utilized to maintain the permitted emission limits of the replaced engine and incorporate the 

new applicable requirements.] 

II.C. Stratospheric Ozone and Climate Protection [40 CFR part 82] 

The permittee shall comply with the standards for recycling and emissions reduction pursuant to 

40 CFR part 82, subpart F: 

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

with the required practices pursuant to 40 CFR §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 40 CFR 

§82.158. 

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

certified by an approved technician certification program pursuant to 40 CFR §82.161. 

II.D. Permit Shield [40 CFR 71.6(f)(3)] 

Nothing in this permit shall alter or affect the following: 

1. The liability of a permittee for any violation of applicable requirements prior to or at the 

time of permit issuance; 

2. The ability of EPA to obtain information from a source pursuant to section 114 of the 

CAA; or 

3. The provisions of section 303 of the CAA (emergency orders), including the authority of 

EPA under that section. 
6

III. Part 71 Administrative Requirements 

III.A. Annual Fee Payment [40 CFR 71.6(a)(7) and 40 CFR 71.9] 

1. The permittee shall pay an annual permit fee in accordance with the procedures outlined 

below. 

[40 CFR 71.9(a)] 

2. The permittee shall pay the annual permit fee each year no later than April 1st. 

[40 CFR 71.9(h)] 

3. The fee payment shall be in United States currency and shall be paid by money order, bank 

draft, certified check, corporate check, or electronic funds transfer payable to the order of 

the U.S. Environmental Protection Agency. 

[40 CFR 71.9(k)(1)] 

4. The permittee shall send fee payment and a completed fee filing form to 

For regular U.S. postal service mail For non-U.S. Postal Service Express mail

(FedEx, Airborne, DHL, and UPS)

 U.S. Environmental Protection Agency U.S. Bank 

FOIA and Miscellaneous Payments Government Lockbox 979078 

Cincinnati Finance Center U.S. EPA FOIA & Misc. Payments 

P.O. Box 979078 1005 Convention Plaza 

St. Louis, MO 63197-9000 SL-MO-C2-GL 

 St. Louis, MO 63101 

 

[40 CFR 71.9(k)(2)] 

[Explanatory note: The fee filing form “FF” may be found on EPA website at: 

http://www.epa.gov/air/oaqps/permits/p71forms.html]

5. The permittee shall send an updated fee calculation worksheet form and a photocopy of 

each fee payment check (or other confirmation of actual fee paid) submitted annually by 

the same deadline as required for fee payment to the address listed in Section III.E. of this 

permit. 

[40 CFR 71.9(h)(1)] 

[Explanatory note: The fee calculation worksheet form “FEE” may be found on EPA website at: 

http://www.epa.gov/air/oaqps/permits/p71forms.html]
7

6. Basis for calculating annual fee: 

(a) The annual emissions fee shall be calculated by multiplying the total tons of actual 

emissions of all “regulated pollutants (for fee calculation)” emitted from the source 

by the presumptive emissions fee (in dollars/ton) in effect at the time of 

calculation. 

[40 CFR 71.9(c)(1)] 

(i) “Actual emissions” means the actual rate of emissions, in tpy, of any 

regulated pollutant (for fee calculation) emitted from a part 71 source over 

the preceding calendar year. Actual emissions shall be calculated using 

each emissions unit’s actual operating hours, production rates, in-place 

control equipment, and types of materials processed, stored, or combusted 

during the preceding calendar year. 

[40 CFR 71.9(c)(6)] 

(ii) Actual emissions shall be computed using methods required by the permit 

for determining compliance, such as monitoring or source testing data. 

[40 CFR 71.9(h)(3)] 

(iii) If actual emissions cannot be determined using the compliance methods in 

the permit, the permittee shall use other federally recognized procedures. 

[40 CFR 71.9(e)(2)] 

[Explanatory note: The presumptive fee amount is revised each calendar year to account for 

inflation, and it is available from EPA prior to the start of each calendar year.]

(b) The permittee shall exclude the following emissions from the calculation of fees: 

(i) The amount of actual emissions of each regulated pollutant (for fee 

calculation) that the source emits in excess of 4,000 tpy; 

[40 CFR 71.9(c)(5)(i)] 

(ii) Actual emissions of any regulated pollutant (for fee calculation) already 

included in the fee calculation; and 

[40 CFR 71.9(c)(5)(ii)] 

(iii) The quantity of actual emissions (for fee calculation) of insignificant 

activities [defined in §71.5(c)(11)(i)] or of insignificant emissions levels 

from emissions units identified in the permittee’s application pursuant 

to §71.5(c)(11)(ii). 

[40 CFR 71.9(c)(5)(iii)] 
8

7. Fee calculation worksheets shall be certified as to truth, accuracy, and completeness by a 

responsible official. 

[Explanatory note: The fee calculation worksheet form “FEE” already incorporates a section to 

help permittees meet this responsibility.] 

[40 CFR 71.9(h)(2)] 

8. The permittee shall retain fee calculation worksheets and other emissions-related data used 

to determine fee payment for 5 years following submittal of fee payment. [Emissionrelated data include, for example, emissions-related forms provided by EPA and used by 

the permittee for fee calculation purposes, emissions-related spreadsheets, and emissionsrelated data, such as records of emissions monitoring data and related support 

information required to be kept in accordance with §71.6(a)(3)(ii).]

[40 CFR 71.9(i)] 

9. Failure of the permittee to pay fees in a timely manner shall subject the permittee to 

assessment of penalties and interest in accordance with §71.9(l). 

[40 CFR 71.9(l)] 

10. When notified by EPA of underpayment of fees, the permittee shall remit full payment 

within 30 days of receipt of notification. 

[40 CFR 71.9(j)(2)] 

11. A permittee who thinks an EPA assessed fee is in error, and who wishes to challenge such 

fee, shall provide a written explanation of the alleged error to EPA along with full 

payment of the EPA assessed fee. 

[40 CFR 71.9(j)(3)] 

III.B. Annual Emissions Inventory [40 CFR 71.9(h)(1) and (2)] 

The permittee shall submit an annual emissions report of its actual emissions for both criteria 

pollutants and regulated HAPs for this facility for the preceding calendar year for fee assessment 

purposes. The annual emissions report shall be certified by a responsible official and shall be 

submitted each year to EPA by April 1st. 

The annual emissions report shall be submitted to EPA at the address listed in Section III.E. of 

this permit. 

[Explanatory note: An annual emissions report, required at the same time as the fee calculation 

worksheet by §71.9(h), has been incorporated into the fee calculation worksheet form “FEE” as a 

convenience to permittees.]
9

III.C. Compliance Requirements [40 CFR 71.6(a)(6)(i) and (ii), sections 113(a) and 113(e)(1) 

of the Act, and 40 CFR 51.212, 52.12, 52.33, 60.11(g), and 61.12] 

1. Compliance with the Permit 

(a) The permittee must comply with all conditions of this part 71 permit. Any permit 

noncompliance constitutes a violation of the CAA and is grounds for enforcement 

action; for permit termination, revocation and reissuance, or modification; or for 

denial of a permit renewal application. 

[40 CFR 71.6(a)(6)(i)] 

(b) 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 this permit. 

[40 CFR 71.6(a)(6)(ii)] 

(c) For the purpose of submitting compliance certifications in accordance with Section 

III.C.3. of this permit, or establishing whether or not a person has violated or is in 

violation of any requirement of this permit, nothing shall preclude the use, 

including the exclusive use, of any credible evidence or information, relevant to 

whether a source would have been in compliance with applicable requirements if 

the appropriate performance or compliance test or procedure had been performed. 

[Section 113(a) and 113(e)(1) of the Act, 40 CFR 51.212, 52.12, 52.33, 

60.11(g), and 61.12] 

2. Compliance Schedule 

(a) For applicable requirements with which the source is in compliance, the source 

will continue to comply with such requirements. 

[40 CFR 71.5(c)(8)(iii)(A)] 

(b) For applicable requirements that will become effective during the permit term, the 

source will meet such requirements on a timely basis. 

[40 CFR 71.5(c)(8)(iii)(B)] 

3. Compliance Certifications 

(a) The permittee shall submit to EPA a certification of compliance with permit terms 

and conditions, including emission limitations, standards, or work practices 

annually each year no later than April 1st. The compliance certification due on 

April 1, 2012 shall cover the period from March 1, 2011 through 

December 31, 2011. Thereafter, each compliance certification shall cover the 

period for the previous calendar year. The compliance certification shall be 

certified as to truth, accuracy, and completeness by a responsible official consistent 

with §71.5(d). 

[40 CFR 71.6(c)(5)] 
10

(b) The certification shall include the following: 

(i) Identification of each permit term or condition that is the basis of the 

certification; 

(ii) The identification of the method(s) or other means used for determining the 

compliance status of each term and condition during the certification 

period, and whether such methods or other means provide continuous or 

intermittent data. Such methods and other means shall include, at a 

minimum, the methods and means required in this permit. If necessary, the 

permittee also shall identify any other material information that must be 

included in the certification to comply with section 113(c)(2) of the CAA, 

which prohibits knowingly making a false certification or omitting material 

information; 

(iii) The status of compliance with the terms and conditions of the permit for the 

period covered by the certification based on the method or means 

designated in (ii) above. The certification shall identify each deviation and 

take it into account in the compliance certification; 

(iv) Such other facts as the EPA may require to determine the compliance status 

of the source; and 

(v) Whether compliance with each permit term was continuous or intermittent. 

 [40 CFR 71.6(c)(5)(iii)] 

[Explanatory note: To help part 71 permittees meet reporting responsibilities, EPA has developed 

a reporting form for annual compliance certifications. The form may be found on EPA website 

at: http://www.epa.gov/air/oaqps/permits/p71forms.html]

III.D. Duty to Provide and Supplement Information [40 CFR 71.6(a)(6)(v), 71.5(a)(3), and 

71.5(b)] 

1. The permittee shall furnish to EPA, within a reasonable time, any information that EPA 

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 EPA copies of records that are required to 

be kept pursuant to the terms of the permit, including information claimed to be 

confidential. Information claimed to be confidential must be accompanied by a claim of 

confidentiality according to the provisions of 40 CFR part 2, subpart B. 

[40 CFR 71.6(a)(6)(v) and 71.5(a)(3)] 

2. The permittee, upon becoming aware that any relevant facts were omitted or incorrect 

information was submitted in the permit application, shall promptly submit such 

supplementary facts or corrected information. In addition, a permittee shall provide 

additional information as necessary to address any requirements that become applicable 

after the date a complete application is filed, but prior to release of a draft permit. 
11

[40 CFR 71.5(b)] 

III.E. Submissions [40 CFR 71.5(d), 71.6(c)(1) and 71.9(h)(2)] 

1. Any document (application form, report, compliance certification, etc.) required to be 

submitted under this permit shall be certified by a responsible official as to truth, accuracy, 

and completeness. Such certifications shall state that based on information and belief 

formed after reasonable inquiry, the statements and information in the document are true, 

accurate, and complete. 

[Explanatory note: EPA has developed a reporting form “CTAC” for certifying truth, accuracy, 

and completeness of part 71 submissions. The form may be found on EPA website at: 

http://www.epa.gov/air/oaqps/permits/p71forms.html] 

2. Any documents required to be submitted under this permit, including reports, test data, 

monitoring data, notifications, compliance certifications, fee calculation worksheets, and 

applications for renewals and permit modifications shall be submitted to: 

Part 71 Permit Contact 

Air Program, 8P-AR 

U.S. Environmental Protection Agency, 

1595 Wynkoop Street 

Denver, Colorado 80202-1129 

III.F. Severability Clause [40 CFR 71.6(a)(5)] 

The provisions of this permit are severable, and in the event of any challenge to any portion of this 

permit, or if any portion is held invalid, the remaining permit conditions shall remain valid and in 

force. 

III.G. Permit Actions [40 CFR 71.6(a)(6)(iii)] 

This permit may be modified, revoked, reopened, and reissued, or terminated for cause. 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. 

III.H. Administrative Permit Amendments [40 CFR 71.7(d)] 

1. The permittee may request the use of administrative permit amendment procedures for a 

permit revision that: 

(a) Corrects typographical errors; 

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

in the permit, or provides a similar minor administrative change at the source; 
12

(c) Requires more frequent monitoring or reporting by the permittee; 

(d) Allows for a change in ownership or operational control of a source where the EPA 

determines that no other change in the permit is necessary, provided that a written 

agreement containing a specific date for transfer of permit responsibility, coverage, 

and liability between the current and new permittee has been submitted to the EPA; 

(e) Incorporates into the part 71 permit the requirements from preconstruction review 

permits authorized under an EPA-approved program, provided that such a program 

meets procedural requirements substantially equivalent to the requirements of 

§71.7 and §71.8 that would be applicable to the change if it were subject to review 

as a permit modification, and compliance requirements substantially equivalent to 

those contained in §71.6; or 

(f) Incorporates any other type of change which EPA has determined to be similar to 

those listed above in subparagraphs (a) through (e) above. 

[Note to permittee: If subparagraphs (a) through (e) above do not apply, please contact EPA for a 

determination of similarity prior to submitting your request for an administrative permit 

amendment under this provision.] 

III.I. Minor Permit Modifications [40 CFR 71.7(e)(1)] 

1. The permittee may request the use of minor permit modification procedures only for those 

modifications that: 

(a) Do not violate any applicable requirement; 

(b) Do not involve significant changes to existing monitoring, reporting, or 

recordkeeping requirements in the permit; 

(c) Do not require or change a case-by-case determination of an emission limitation or 

other standard, or a source-specific determination for temporary sources of ambient 

impacts, or a visibility or increment analysis; 

(d) Do not seek to establish or change a permit term or condition for which there is no 

corresponding underlying applicable requirement and that the source has assumed 

to avoid an applicable requirement to which the source would otherwise be subject. 

Such terms and conditions include: 

(i) A federally enforceable emissions cap assumed to avoid classification as a 

modification under any provision of title I; and 

(ii) An alternative emissions limit approved pursuant to regulations 

promulgated under section 112(i)(5) of the CAA; 
13

(e) Are not modifications under any provision of title I of the CAA; and 

(f) Are not required to be processed as a significant modification. 

[40 CFR 71.7(e)(1)(i)(A)] 

2. Notwithstanding the list of changes ineligible for minor permit modification procedures in

paragraph 1, above, minor 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 an applicable implementation plan or in 

applicable requirements promulgated by EPA. 

[40 CFR 71.7(e)(1)(i)(B)] 

3. An application requesting the use of minor permit modification procedures shall meet the 

requirements of §71.5(c) and shall include the following: 

(a) A description of the change, the emissions resulting from the change, and any new 

applicable requirements that will apply if the change occurs; 

(b) The source's suggested draft permit; 

(c) Certification by a responsible official, consistent with §71.5(d), that the proposed 

modification meets the criteria for use of minor permit modification procedures 

and a request that such procedures be used; and 

(d) Completed forms for the permitting authority to use to notify affected states as 

required under §71.8. 

[40 CFR 71.7(e)(1)(ii)] 

4. The source may make the change proposed in its minor permit modification application 

immediately after it files such application. After the source makes the change allowed by 

the preceding sentence, and until the permitting authority takes any of the actions 

authorized by §71.7(e)(1)(iv)(A) through (C), the source must comply with both the 

applicable requirements governing the change and the proposed permit terms and 

conditions. During this time period, the source need not comply with the existing permit 

terms and conditions it seeks to modify. However, if the source fails to comply with its 

proposed permit terms and conditions during this time period, the existing permit terms 

and conditions it seeks to modify may be enforced against it. 

[40 CFR 71.7(e)(1)(v)] 

5. The permit shield under §71.6(f) may not extend to minor permit modifications. 

[40 CFR 71.7(e)(1)(vi)]. 
14

III.J. Group Processing of Minor Permit Modifications [40 CFR 71.7(e)(2)] 

1. Group processing of modifications by EPA may be used only for those permit 

modifications: 

(a) That meet the criteria for minor permit modification procedures under 

Section III.I., of this permit; and 

(b) That collectively are below the threshold level of 10% of the emissions allowed by 

the permit for the emissions unit for which the change is requested, 

20% of the applicable definition of major source in §71.2, or 5 tpy, whichever is 

least. 

[40 CFR 71.7(e)(2)(i)] 

2. An application requesting the use of group processing procedures shall be submitted to 

EPA, shall meet the requirements of §71.5(c), and shall include the following: 

(a) A description of the change, the emissions resulting from the change, and any new 

applicable requirements that will apply if the change occurs; 

(b) The source's suggested draft permit; 

(c) Certification by a responsible official, consistent with §71.5(d), that the proposed 

modification meets the criteria for use of group processing procedures and a 

request that such procedures be used; 

(d) A list of the source's other pending applications awaiting group processing, and a 

determination of whether the requested modification, aggregated with these other 

applications, equals or exceeds the threshold set under section 1.(b) above; and 

(e) Completed forms for the permitting authority to use to notify affected states as 

required under §71.8. 

[40 CFR 71.7(e)(2)(ii)] 

3. The source may make the change proposed in its minor permit modification application 

immediately after it files such application. After the source makes the change allowed by 

the preceding sentence, and until the permitting authority takes any of the actions 

authorized by §71.7(e)(1)(iv)(A) through (C), the source must comply with both the 

applicable requirements governing the change and the proposed permit terms and 

conditions. During this time period, the source need not comply with the existing permit 

terms and conditions it seeks to modify. However, if the source fails to comply with its 

proposed permit terms and conditions during this time period, the existing permit terms 

and conditions it seeks to modify may be enforced against it. 

[40 CFR 71.7(e)(2)(v)] 

4. The permit shield under §71.6(f) may not extend to group processing of minor permit 

modifications. 
15

[40 CFR 71.7(e)(2)(vi)] 

III.K. Significant Permit Modifications [40 CFR 71.7(e)(3)] 

1. The permittee must request the use of significant permit modification procedures for those 

modifications that: 

(a) Do not qualify as minor permit modifications or as administrative amendments; 

(b) Are significant changes in existing monitoring permit terms or conditions; or 

(c) Are relaxations of reporting or recordkeeping permit terms or conditions. 

[40 CFR 71.7(e)(3)(i)] 

2. Nothing herein shall be construed to preclude the permittee from making changes 

consistent with part 71 that would render existing permit compliance terms and conditions 

irrelevant. 

[40 CFR 71.7(e)(3)(i)] 

3. Permittees must meet all requirements of part 71 for applications, public participation, and 

review by affected states and tribes for significant permit modifications. For the 

application to be determined complete, the permittee must supply all information that is 

required by §71.5(c) for permit issuance and renewal, but only that information that is 

related to the proposed change. 

[40 CFR 71.7(e)(3)(ii), 71.8(d), and 71.5(a)(2)] 

III.L. Reopening for Cause [40 CFR 71.7(f)] 

The permit may be reopened and revised prior to expiration under any of the following 

circumstances: 

1. Additional applicable requirements under the Act become applicable to a major part 71 

source with a remaining permit term of 3 or more years. Such a reopening shall be 

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

such reopening is required if the effective date of the requirement is later than the date on 

which the permit is due to expire, unless the original permit or any of its terms and 

conditions have been extended pursuant to §71.7 (c)(3);

2. Additional requirements (including excess emissions requirements) become applicable to 

an affected source under the acid rain program. Upon approval by the Administrator, 

excess emissions offset plans shall be deemed to be incorporated into the permit; 

3. EPA determines that the permit contains a material mistake or that inaccurate statements 

were made in establishing the emissions standards or other terms or conditions of the 

permit; or 
16

4. EPA determines that the permit must be revised or revoked to assure compliance with the 

applicable requirements. 

III.M. Property Rights [40 CFR 71.6(a)(6)(iv)] 

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

III.N. Inspection and Entry [40 CFR 71.6(c)(2)] 

Upon presentation of credentials and other documents as may be required by law, the permittee 

shall allow EPA or an authorized representative to perform the following: 

1. Enter upon the permittee’s premises where a part 71 source is located, or emissions-related 

activity is conducted, or where records must be kept under the conditions of the permit; 

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

conditions of the permit; 

3. Inspect at reasonable times any facilities, equipment (including monitoring and air 

pollution control equipment), practices, or operations regulated or required under the 

permit; and 

4. As authorized by the CAA, sample or monitor at reasonable times substances or 

parameters for the purpose of assuring compliance with the permit or applicable 

requirements. 

III.O. Emergency Provisions [40 CFR 71.6(g)] 

1. In addition to any emergency or upset provision contained in any applicable requirement, 

the permittee may seek to establish that noncompliance with a technology-based emission 

limitation under this permit was due to an emergency. To do so, the permittee shall 

demonstrate the affirmative defense of emergency through properly signed 

contemporaneous operating logs, or other relevant evidence that: 

(a) An emergency occurred and that 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 emissions standards, or other 

requirements in this permit; and 

(d) The permittee submitted notice of the emergency to EPA within 2 working days of 

the time when emission limitations were exceeded due to the emergency. This 
17

notice must contain a description of the emergency, any steps taken to mitigate 

emissions, and corrective actions taken. This notice fulfills the requirements for 

prompt notification of deviations. 

2. In any enforcement proceeding, the permittee attempting to establish the occurrence of an 

emergency has the burden of proof. 

3. 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 that causes the source to 

exceed a technology-based emission limitation under the permit due to unavoidable 

increases in emissions attributable to the emergency. An emergency shall not include 

noncompliance to the extent caused by improperly designed equipment, lack of preventive 

maintenance, careless or improper operation, or operator error. 

III.P. Transfer of Ownership or Operation [40 CFR 71.7(d)(1)(iv)] 

A change in ownership or operational control of this facility may be treated as an administrative 

permit amendment if the EPA determines no other change in this permit is necessary and provided 

that a written agreement containing a specific date for transfer of permit responsibility, coverage, 

and liability between the current and new permittee has been submitted to EPA. 

III.Q. Off Permit Changes [40 CFR 71.6(a)(12) and 71.6(a)(3)(ii)] 

The permittee is allowed to make certain changes without a permit revision, provided that the 

following requirements are met: 

 

1. Each change is not addressed or prohibited by this permit; 

2. Each change shall meet with all applicable requirements and shall not violate any existing 

permit term or condition; 

3. Changes under this provision may not include changes subject to any requirement of 

40 CFR parts 72 through 78 or modifications under any provision of title I of the CAA; 

4. The permittee must provide contemporaneous written notice to EPA of each change, 

except for changes that qualify as insignificant activities under §71.5(c)(11). The written 

notice must describe each change, the date of the change, any change in emissions, 

pollutants emitted, and any applicable requirements that would apply as a result of the 

change; 

5. The permit shield does not apply to changes made under this provision; and 

6. The permittee must keep a record describing all changes that result in emissions of any 

regulated air pollutant subject to any applicable requirement not otherwise regulated under 

this permit, and the emissions resulting from those changes. 
18

7. For replacement of an existing permitted compressor engine with an engine of the same 

make, model, horsepower rating, and configured to operate in the same manner as the 

engine being replaced, in addition to satisfying all other provisions for off permit changes, 

the permittee shall satisfy the following provisions: 

(a) The replacement engine employs air emissions control devices, monitoring, record 

keeping and reporting that are equivalent to those employed by the engine being 

replaced; 

(b) The replacement of the existing engine does not constitute a major modification or 

major new source as defined in Federal PSD regulations (40 CFR 52.21); 

(c) No new applicable requirements, as defined in 40 CFR 71.2, are triggered by the 

replacement; and 

(d) The following information is provided in a written notice to EPA in addition to the 

standard information listed above for contemporaneous written notices for off 

permit changes: 

(i) Make, model number, serial number, horsepower rating and configuration 

of the existing engine and the replacement engine; 

(ii) Manufacture date, commence construction date (per the definition in 

40 CFR 60.2, 60.4230(a) and 63.2), installation date, and start-up date of 

the replacement engine; 

(iii) If applicable, documentation of the cost to rebuild a replacement engine 

versus the cost to purchase a new engine in order to support claims that an 

engine is not “reconstructed,” as defined in 40 CFR 60.15 and 

40 CFR 63.2; 

(iv) 40 CFR part 60, subpart IIII (CI Engine NSPS) non-applicability 

documentation as appropriate; 

(v) 40 CFR part 60, subpart JJJJ (SI Engine SNPS) non-applicability 

documentation as appropriate; 

(vi) 40 CFR part 63, subpart ZZZZ (RICE MACT) non-applicability 

documentation for major sources, as appropriate; 

(vii) 40 CFR part 63, subpart ZZZZ (RICE MACT) non-applicability 

documentation for area sources, as appropriate; 

(viii) Documentation to demonstrate that the replacement does not constitute a 

major new source or major modification, as defined in Federal PSD rules 

(40 CFR 52.21), as follows: 

A. If the replacement will not constitute a "physical change or change 

in the method of operation" as described in §52.21(b), an 

explanation of how that conclusion was reached shall be provided. 
19

B. If the replacement will constitute a "physical change or change in 

the method of operation" as described §52.21(b), the following 

information shall be provided: 

(1) If the existing source is a "major stationary source" as 

defined in §52.21(b): For each "regulated NSR pollutant" as 

defined in §52.21(b), a demonstration (including all 

calculations) that the replacement will not be a "major 

modification" as defined in §52.21(b). A modification is 

major only if it causes a "significant emissions increase" as 

defined in §52.21(b), and also causes a "significant net 

emissions increase" as defined in §52.21(b). 

The “Applicability Procedures” of §52.21(a)(2) shall be used 

to calculate whether or not there will be a significant 

emissions increase. If there will be a significant emissions 

increase, then calculations shall be provided to demonstrate 

there will not be a significant net emissions increase. These 

latter calculations shall include all sourcewide 

contemporaneous and creditable emission increases and 

decreases, as defined in §52.21(b), summed with the PTE of 

the replacement unit(s). 

If netting is used to demonstrate that the replacement will 

not constitute a "major modification," verification shall be 

provided that the replacement unit(s) employ emission 

controls at least equivalent in control effectiveness to those 

employed by the unit(s) being replaced. 

PTE of replacement unit(s) shall be determined based on the 

definition of PTE in §52.21(b). For each "regulated NSR 

pollutant" for which the PTE is not "significant," 

calculations used to reach that conclusion shall be provided. 

(2) If the existing source is not a "major stationary source" as 

defined in §52.21(b): For each "regulated NSR pollutant," a 

demonstration (including all calculations) that the

replacement unit(s), by itself, will not constitute a "major 

stationary source" as defined in §52.21(b). 

8. The notice shall be kept on site and made available to EPA on request, in accordance with 

the general recordkeeping provision of this permit.

9. Submittal of the written notice required above shall not constitute a waiver, exemption, or 

shield from applicability of any applicable standard or PSD permitting requirements under 
20

40 CFR 52.21 that would be triggered by the replacement of any one engine, or by 

replacement of multiple engines. 

III.R. Permit Expiration and Renewal [40 CFR 71.5(a)(1)(iii), 71.5(a)(2), 71.5(c)(5), 

71.6(a)(11), 71.7(b), 71.7(c)(1), and 71.7(c)(3)] 

1. This permit shall expire upon the earlier occurrence of the following events: 

(a) Five (5) years elapses from the date of issuance; or 

(b) The source is issued a part 70 or part 71 permit under an EPA approved or 

delegated permit program. 

[40 CFR 71.6(a)(11)] 

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

complete permit renewal application has been submitted at least 6 months but not more 

than 18 months prior to the date of expiration of this permit. 

[40 CFR 71.5(a)(1)(iii)] 

3. If the permittee submits a timely and complete permit application for renewal, consistent 

with §71.5(a)(2), but EPA has failed to issue or deny the renewal permit, then all the terms 

and conditions of the permit, including any permit shield granted pursuant to §71.6(f) shall 

remain in effect until the renewal permit has been issued or denied. 

 [40 CFR 71.7(c)(3)] 

4. The permittee’s failure to have a part 71 permit is not a violation of this part until EPA 

takes final action on the permit renewal application. This protection shall cease to apply 

if, subsequent to the completeness determination, the permittee fails to submit any 

additional information identified as being needed to process the application by the 

deadline specified in writing by EPA. 

[40 CFR 71.7(b)] 

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

permit issuance, including those for public participation, affected State, and tribal review. 

[40 CFR 71.7(c)(1)] 

6. The application for renewal shall include the current permit number, description of permit 

revisions and off permit changes that occurred during the permit term, any applicable 

requirements that were promulgated and not incorporated into the permit during the permit 

term, and other information required by the application form. 

[40 CFR 71.5(a)(2) and 71.5(c)(5)] 
21

IV. Appendices to the Part 71 Permit 

IV.A. Inspection Information

1. Directions to Tiffany Compressor Facility 

From Bayfield, Colorado, travel south on Buck Highway/County Road 521 to Ignacio, 

then south on State Highway 151 past mile marker 9 to County Road 330. Travel 

approximately 1 mile east on County Road 330 to Tiffany Compressor Station. 

 

2. Location of the Tiffany Compressor Facility 

Latitude: 37°, 2.999’ North 

Longitude: 107°, 30.707’ West 

3. Safety Considerations 

 All visitors to the facility are expected to adhere to Tiffany Compressor Station safety 

policies. Policies of particular concern are those regarding the Personal Protective 

Equipment (PPE) and performance of Hot Work. As posted at the entrance to the station, 

Tiffany Compressor Station requires persons entering the site to wear a hard hat, safety 

glasses, safety toe footwear, hearing protection, and fire retardant clothing. Tiffany 

Compressor Station also requires a permit (issued by authorized Tiffany Compressor 

Station employees) prior to the performance of any hot work at the station.