Department of Environmental Quality 

Matthew H. Mead, Governor 

January 24, 2014 

To protect, conserve and enhance the quality of Wyoming's 

environment for the benefit of current and future generations. 

Mr. Shaun McGrath 

Regional Administrator 

USEP A Region 8 

Mail Code: SP-AR 

1595 Wynkoop Street 

Denver, CO 80202-1129 

Todd Parfitt, Director 

RE: 110 Infrastructure SIP for the 2010 l-Hour Nitrogen Dioxide (N02) National 

Ambient Air Quality Standard (NAAQS) 

Dear Mr. McGrath: 

Section 11 O(a)(l) of the Clean Air Act (CAA) requires that each state, after a new or 

revised National Ambient Air Quality Standard (NAAQS) is promulgated, review their State 

Implementation Plans (SIPs) to ensure that they meet the requirements of the "infrastructure 

elements" of Section 110(a)(2). In response to the new !-hour N02 NAAQS that was 

promulgated on April 12, 2010, the State of Wyoming updated the list of documentation required 

to demonstrate that the SIP meets the requirements of Sections 1 lO(a)(l) and (2) of the CAA. 

The State of Wyoming has made a determination that the !-hour N02 Infrastructure SIP contains 

all the necessary provisions to address the requirements for the 2010 !-hour N02 NAAQS. The 

2010 !-hour N02 Infrastructure SIP was taken out for public notice beginning December 16, 

2013. A public hearing was held in Cheyenne, Wyoming on .January 15, 2014, and no comments 

were received. 

If you have any questions regarding this submittal or if you need further information, 

please feel free to contract Steven A. Dietrich, Air Quality Administrator, at 307-777-7391. 

�-

Sincerely, 

Todd Parfitt 

Director 

Department of Environmental Quality 

Enclosure: 110 Infrastructure SIP Elements for the 2010 I-Hour N02 NAAQS 

cc: Steven A. Dietrich, AQD Administrator 

Jeni Cederle, AQD 

Herschler Building · 122 West 25th Street · Cheyenne, WY 82002 • http://deq.state.wy.us 

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STATE OF WYOMING

110 Infrastructure SIP Elements for the 

2010 1-Hour Nitrogen Dioxide National Ambient Air Quality Standard

(Reviewed December 2013)

Emission limits and other control measures: Section 110(a)(2)(A) requires SIPs to include 

enforceable emission limits and other control measures, means or techniques, schedules for 

compliance and other related matters.

110(a)(2)(A) Non-regulatory Documents:

1. Control Strategy Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

2. Source Surveillance Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

3. Compliance Schedule Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

110(a)(2)(A) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 1, Section 3, Definitions

a. Most recent State regulatory SIP document submitted to EPA 3/8/13

b. EPA approval pending

c. Preceding WAQSR, Section 2, Definitions

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

2. Chapter 1, Section 4, Diluting and concealing emissions

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 18, Diluting and concealing emissions

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

3. Chapter 1, Section 5, Abnormal conditions and equipment malfunction

a. Most recent State regulatory SIP document submitted to EPA 9/11/2008

b. EPA final Federal Register 4/16/2010; 75 FR 19886

c. Preceding WAQSR, Section 19, Abnormal conditions and equipment malfunction

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

4. Chapter 3, Section 2, Emission standards for particulate matter

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 14, Control of particulate emissions

i. Original State regulations submitted 1/28/72
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ii. Approved by EPA 5/31/72; 37 FR 10842

5. Chapter 3, Section 3, Emission standards for nitrogen oxides

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 10, Nitrogen oxides

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

6. Chapter 3, Section 4, Emission standards for sulfur oxides

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 4, Sulfur oxides

i. Original State regulations submitted 7/22/74, resubmitted 8/7/74

ii. EPA approved via FR date of 6/10/75

7. Chapter 3, Section 5, Emission standards for carbon monoxide

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 12, Carbon monoxide

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

8. Chapter 3, Section 6, Emission standards for volatile organic compounds

a. Most recent State regulatory SIP document (updated through Section 9, Incorporation by 

reference) submitted to EPA 5/24/2012

b. EPA approval pending

c. Preceding WAQSR, Section 9, Hydrocarbons

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

9. Chapter 4, Section 2, Existing sulfuric acid production units

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 5, Sulfuric acid mist

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842 

10. Chapter 4, Section 3, Existing nitric acid manufacturing plants 

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 10, Nitrogen oxides

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

11. Chapter 8, Section 2, Sweetwater County particulate matter regulations

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 25, Sweetwater County non-attainment area particulate matter 

regulations

i. Original State regulations submitted 1/25/79

ii. Approved by EPA 7/2/79; 44 FR 38473

12. Chapter 8, Section 3, Conformity of general federal actions to state implementation plans
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a. Most recent State regulatory SIP document submitted to EPA 12/21/12

b. EPA final Federal Register 8/15/13; 78 FR 49685

13. Chapter 10, Section 2, Open burning restrictions

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 13, Open burning restrictions

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

14. Chapter 10, Section 3, Wood waste burners

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 15, Wood waste burners

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

15. Chapter 13, Section 2, Motor vehicle pollution control

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 17, Motor vehicle pollution control

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

110(a)(2)(A) Comment: 

Wyoming also regulates emissions of NO2 through the State’s PSD and minor NSR programs.

Wyoming’s infrastructure SIP meets the requirements of the CAA section 110(a)(2)(A) for the 2010 

1-hour NO2 NAAQS.

Ambient air quality monitoring/data system: Section 110(a)(2)(B) requires SIPs to include 

provisions to provide for establishment and operation of appropriate devices, methods, systems, and 

procedures necessary to:

(i) monitor, compile, and analyze data on ambient air quality and

(ii) upon request, make such data available to the EPA

110(a)(2)(B) Non-regulatory Documents:

1. Air Quality Surveillance Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

2. Air Quality Surveillance Network Document

a. State non-regulatory SIP document submitted to EPA on 8/26/81

b. Approved by EPA 2/9/82; 47 FR 5892

3. Implementation Plan for Lead

a. Original State non-regulatory SIP document submitted to EPA on 8/29/84

b. Approved by EPA 10/11/84; 49 FR 39843
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4. Wyoming Ambient Air Monitoring Annual Network Plan

a. Most recent Wyoming Ambient Air Monitoring Annual Network Plan (2013) submitted 

to EPA on 6/27/13

b. EPA approval pending

c. Preceding 2012 Wyoming Ambient Air Monitoring Annual Network Plan approved by 

EPA by letter received on 8/19/13

110(a)(2)(B) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 2, Section 2, Ambient standards for particulate matter

a. Most recent State regulatory SIP document submitted to EPA 8/19/2011

b. EPA approval pending

c. Preceding WAQSR, Section 3, Particulates

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

2. Chapter 2, Section 3, Ambient standards for nitrogen oxides

a. Most recent regulatory SIP document submitted to EPA 1/31/2013

b. EPA approval pending 

c. Preceding WAQSR, Section 10, Nitrogen oxides

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

3. Chapter 2, Section 4, Ambient standards for sulfur oxides

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA Final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 4, Sulfur oxides

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

4. Chapter 2, Section 5, Ambient standards for carbon monoxide

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 12, Carbon monoxide

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

5. Chapter 2, Section 6, Ambient standards for ozone

a. Most recent regulatory SIP document submitted to EPA 1/31/2013

b. EPA approval pending

c. Preceding WAQSR, Section 8, Photochemical oxidants

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

6. Chapter 2, Section 8, Ambient standards for suspended sulfates

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 6, Sulfation

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

7. Chapter 2, Section 10, Ambient standards for lead

a. Most recent State regulatory SIP document submitted to EPA 8/19/2011
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b. EPA approval pending

c. Preceding WAQSR, Section 26, Ambient air quality standard for lead

i. Original State regulations submitted 8/29/84

ii. Approved by EPA 10/11/84; 49 FR 39843

110(a)(2)(B) Comment:

Wyoming’s air monitoring and data systems programs meet the requirements of the CAA section 

110(a)(2)(B) for the 2010 1-hour NO2 NAAQS.

Program for enforcement of control measures: Section 110(a)(2)(C) requires States to include a 

program providing for enforcement of all SIP measures and the regulation of construction of new or 

modified stationary sources to meet prevention of significant deterioration (PSD) and nonattainment 

NSR requirements.

110(a)(2)(C) Non-regulatory Documents:

1. Legal Authority Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

2. Source Surveillance Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

3. Review of New Sources and Modifications Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

4. 3/3/08 Memorandum from Cynthia Cody, EPA Region 8, clarifications regarding 110 SIP 

infrastructure submissions for PM2.5, specifically addressing the current unavailability of EPA rules 

or guidance on PM2.5 implementation through the PSD program

110(a)(2)(C) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 6, Section 2, Permit requirements for construction, modification, and operation

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 21, Permit requirements for construction, modification and 

operation

i. Original State regulations submitted 7/22/74, resubmitted 8/7/74

ii. EPA approved via FR date of 6/10/75

2. Chapter 6, Section 4, Prevention of significant deterioration

a. Most recent State regulatory SIP documents submitted to EPA 5/24/12 and 3/8/13

b. EPA final Federal Register 12/6/13; 78 FR 73445

c. EPA final Federal Register 11/22/13; 78 FR 69998

d. Preceding WAQSR, Section 24, Prevention of significant deterioration

i. Original State regulations submitted 1/25/79
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ii. EPA approved 7/2/79; 44 FR 38473

3. Chapter 6, Section 13, Nonattainment permit requirements

a. Most recent State regulatory SIP document submitted to EPA 5/10/2011

b. EPA approval pending

110(a)(2)(C) Comment: 

The State of Wyoming has a SIP-approved PSD program covering the requirements for all regulated 

NSR pollutants, including GHG, which meets the requirements of 110(a)(2)(C). Emission limits and 

control measures that satisfy the requirements of 110(a)(2)(C) are identified under section 110(a)(2)(A) 

“Emission limits and other control measures,” included in this document.

Wyoming’s program for enforcement of control measures meets the requirements of the CAA section 

110(a)(2)(C) for the 2010 1-hour NO2 NAAQS.

Interstate and international transport provisions: Section 110(a)(2)(D)(i) requires SIPs to include 

provisions prohibiting any source or other type of emissions activity in one State from contributing 

significantly to nonattainment, or interfering with maintenance, of the NAAQS in another State, or 

from interfering with measures required to prevent significant deterioration of air quality or to protect 

visibility in another State. 

Section 110(a)(2)(D)(ii) requires SIPs to include adequate provisions insuring compliance with 

applicable requirements of sections 126 and 115 (relating to interstate and international pollution 

abatement).

110(a)(2)(D) Non-regulatory Documents:

1. Original Wyoming Interstate Transport SIP [Non-Regulatory] (per Section 110(a)(2)(D)(i) of the 

CAA) submitted to EPA on 5/3/07, and consisting of:

a. Memorandum dated 5/3/07 from David A. Finley, AQD Administrator, to John V. Corra, 

DEQ Director

b. Letter dated 5/3/07 from John V. Corra, DEQ Director, to Robbie Roberts, EPA Region 8 

Regional Administrator

c. Certification Page For State Implementation Plans For The Air Quality Division Of The 

Department Of Environmental Quality; SIP adopted by DEQ on 3/15/07; DEQ adoption of 

SIP approved by Governor Dave Freudenthal on 4/15/07

d. Memorandum dated 4/9/07 from John V. Corra, DEQ Director, to Governor Freudenthal

e. Letter dated 4/24/07 from Nancy Vehr of the Office of the Attorney General to Dave Finley, 

AQD Administrator

f. Public Notice of Air Quality Advisory Board Meeting of December 11, 2006

g. Dates of publication of Public Notice in five Wyoming newspapers

h. Sign-in sheet for attendees of 12/11/06 Air Quality Advisory Board Meeting

i. Air Quality Advisory Board Meeting Agenda

j. Negative Declaration Demonstration
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k. Approved by EPA 5/8/2008; 73 FR 26019

2. Revised 309 Regional Haze SIP; SO2 Backstop Trading Program 

a. Submitted to EPA on 1/12/11

b. EPA final Federal Register 12/12/12; 77 FR 73926

110(a)(2)(D) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 6, Section 2, Permit requirements for construction, modification, and operation

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

2. Chapter 6, Section 4, Prevention of significant deterioration

a. Most recent State regulatory SIP documents submitted to EPA 5/24/12 and 3/8/13

b. EPA final Federal Register 12/6/13; 78 FR 73445

c. EPA final Federal Register 11/22/13; 78 FR 69998

d. Preceding WAQSR, Section 24, Prevention of significant deterioration

i. Original State regulations submitted 1/25/79

ii. EPA approved 7/2/79; 44 FR 38473

3. Chapter 6, Section 13, Nonattainment permit requirements

a. Most recent State regulatory SIP document submitted to EPA 5/10/2011

b. EPA approval pending

4. Chapter 9, Section 2, Visibility

a. Revised WAQSR format EPA approved 7/28/2004, 69 FR 44965

b. Preceding WAQSR, Section 28, Visibility

i. Submitted as part of the SIP for Class I Visibility Protection

ii. Approved by EPA on 2/15/1989, 54 FR 6912

5. Wyoming Environmental Quality Act, Section 35-11-207, Notification to the environmental 

protection agency and contiguous states

110(a)(2)(D) Comment:

In a letter to the EPA from Governor Matthew H. Mead dated 1/12/11, the State of Wyoming 

recommended 1-hour nitrogen dioxide “attainment” designations be made for all areas not under the 

jurisdiction of Tribal Authorities since the monitoring network in place showed no violations of NO2, 

and there are no requirements upon the State to deploy a new monitoring network to measure traffic 

impacts. As noticed in 77 FR 9532 on 2/17/2012, all areas of the United States were designated as 

“unclassifiable/attainment” for the 2010 1-hour NO2 NAAQS. The basis for designating these areas as 

“unclassifiable/attainment” is monitored air quality data from calendar years 2008-2010, indicating no 

violations of the 1-hour nitrogen dioxide NAAQS, thereby demonstrating that Wyoming is in 

compliance with CAA section 110(a)(2)(D)(i) for the 1-hour NO2 NAAQS and does not contribute to 

nonattainment or interfere with maintenance in another State.

No source or sources within the State are the subject of an active finding under section 126 of the CAA,

and there are no final findings under section 115 of the CAA against Wyoming with respect to the 2010 

1-hour NO2 NAAQS. Therefore, Wyoming’s infrastructure SIP meets the requirements of CAA 

section 110(a)(2)(D)(ii) for the 2010 1-hour NO2 NAAQS. 
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Adequate personnel, funding and authority: Section 110(a)(2)(E) requires States to provide for 

adequate personnel, funding, and legal authority under State law, and CAA section 128 requirements to 

carry out its SIP.

110(a)(2)(E) Non-regulatory Documents:

1. Resources Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

2. Legal Authority Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

3. Executive Order (EO) 1981-12

a. Enacted and signed by Governor Herschler in 1981

b. The EO represents the obligation of the agency to guard against ex parte contacts and biased 

decision making.

c. Officers appointed by the Governor will comply with requirements set forth in Sections 1, 2 

and 3 (Attachment A)

4. Executive Order (EO) 1997-4

a. Enacted and signed by Governor Geringer in 1997

b. The EO represents the code of ethics all public officials, elected officials, appointees, and 

employees of the Executive Branch of the State of Wyoming must adhere to. (Attachment 

A)

5. State of Wyoming Personnel Rules

a. Chapter 1: General Provisions; Section 15, Conflicts of Interest (Attachment A)

110(a)(2)(E) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 1, Section 2, Authority

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

2. Chapter 6, Section 2(g), Permit requirements for construction, modification, and operation

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

3. Wyoming Environmental Quality Act 

a. Section 9-13-106, Official decisions and votes

b. Section 9-13-109, Penalties

c. Section 16-3-112(a), Contested cases; presiding officers; qualifications; powers; outside 

personnel, hearing officers

d. Section 35-11-102, Policy and purpose

e. Section 35-11-109, Powers and duties of director

f. Section 35-11-901, Violations of provisions; penalties
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110(a)(2)(E) Comment:

The State of Wyoming also receives sections 103 and 105 grant funds through its Performance 

Partnership Agreement (PPA) grants along with required State matching funds to provide funding 

necessary to carry out Wyoming’s SIP requirements. The State has the authority, funding and adequate 

personnel to fulfill the requirements necessary to meet section 110(a)(2)(E)(i) for the 2010 1-hour NO2 

NAAQS.

Wyoming statutes and Executive Orders provide the mechanisms to satisfy CAA section 128 and meet 

the requirements of CAA section 110(a)(2)(E)(ii) for the 2010 1-hour NO2 NAAQS. 

The State does not rely upon any other local or regional government agency or instrumentality for 

implementation of the SIP, and therefore meets the requirements of CAA section 110(a)(2)(E)(iii) for 

the 2010 1-hour NO2 NAAQS.

Stationary source monitoring system: Section 110(a)(2)(F) requires States to establish a system to 

monitor emissions from stationary sources and to submit periodic emissions reports.

110(a)(2)(F) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 6, Section 2, Permit requirements for construction, modification, and operation

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

2. Chapter 7, Section 2, Continuous monitoring requirements for existing sources

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 23, Continuous monitoring requirements for existing sources

i. Original State regulations submitted 1/25/79

ii. EPA approved 7/2/79; 44 FR 38473

110(a)(2)(F) Comment:

Wyoming’s program for stationary source monitoring, recordkeeping and reporting meets the 

requirements of the CAA section 110(a)(2)(F) for the 2010 1-hour NO2 NAAQS.

Emergency power: Section 110(a)(2)(G) requires States to provide for authority to address activities 

causing imminent and substantial endangerment to public health, including contingency plans to 

implement the emergency episode provisions in their SIPs.

110(a)(2)(G) Non-regulatory Documents:

1. Emergency Episode Plan Document
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a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

2. Emergency Episode Contingency Plan Document

a. Original State non-regulatory SIP document submitted to EPA on 8/26/81

b. Approved by EPA 2/9/82; 47 FR 5892

3. 3/3/08 Memorandum from Cynthia Cody, EPA Region 8, clarifications regarding 110 SIP 

infrastructure submissions for PM2.5, specifically addressing the current unavailability of EPA rules 

or guidance on PM2.5 implementation through emergency episode plans. As a Priority III area (as 

defined under 40 CFR 51.151), the State of Wyoming is not required to submit an Emergency 

Episode Plan.

110(a)(2)(G) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 12, Section 2, Air pollution emergency episodes

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 20, Air pollution emergency episodes

i. Original State regulations submitted 1/28/72

ii. Approved by EPA 5/31/72; 37 FR 10842

2. Wyoming Environmental Quality Act, Section 35-11-115, Power of the director to issue emergency 

orders

110(a)(2)(G) Comment:

Wyoming’s program for addressing pollution emergency episodes meets the requirements of the CAA 

section 110(a)(2)(G) for the 2010 1-hour NO2 NAAQS. 

Future SIP revisions: Section 110(a)(2)(H) requires States to have the authority to revise their SIPs in 

response to changes in the NAAQS, availability of improved methods for attaining the NAAQS, or in 

response to an EPA finding that the SIP is substantially inadequate.

110(a)(2)(H) Non-regulatory Document:

1. Implementation Plan Reviews Document

a. Original State non-regulatory SIP document submitted to EPA on 4/30/81

b. Approved by EPA 4/19/83; 48 FR 16682

110(a)(2)(H) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Wyoming Environmental Quality Act, Section 35-11-109, Powers and duties of director

2. Wyoming Environmental Quality Act, Section 35-11-202, Establishment of standards
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110(a)(2)(H) Comment:

Wyoming has the authority to revise the SIP as required by the CAA section 110(a)(2)(H) for the 2010 

1-hour NO2 NAAQS.

Plan Revisions for Nonattainment Areas: Section 110(a)(2)(I) requires, in the case of a SIP or SIP 

revision for a nonattainment area, the SIP must meet applicable requirements of part D relating to 

nonattainment areas.

110(a)(2)(I) Comment:

According to EPA’s interpretation of the CAA, section 110(a)(2)(I) Plan Revisions for Nonattainment 

Areas will not be addressed in the context of an infrastructure SIP and air agencies do not need to 

address Element I in an infrastructure SIP submission. Section 110(a)(2)(I) infrastructure elements will 

be reviewed and acted upon through a separate process. (Guidance on Infrastructure State 

Implementation Plan (SIP) Elements under Clean Air Act Sections 110(a)(1) and 110(a)(2), September 

13, 2013, OAQPS)

Consultation with government officials: Section 110(a)(2)(J) requires States to provide a process for 

consultation with local governments and Federal Land Managers carrying out NAAQS implementation 

requirements pursuant to section 121 relating to consultation.

110(a)(2)(J) Non-regulatory Document:

1. Consultation Document

a. Original State non-regulatory SIP document submitted to EPA on 1/25/79

b. Approved by EPA 7/2/79; 44 FR 38473

Public notification: Section 110(a)(2)(J) further requires States to notify the public if NAAQS are 

exceeded in an area and to enhance public awareness of measures that can be taken to prevent 

exceedances pursuant to section 127 relating to public notification.

110(a)(2)(J) Non-regulatory Document:

1. Public Notification of Air Quality Document

a. Original State non-regulatory SIP document submitted to EPA on 1/25/79

b. Approved by EPA 7/2/79; 44 FR 38473

PSD and visibility protection: Section 110(a)(2)(J) also requires States to meet applicable 

requirements of part C related to prevention of significant deterioration and visibility protection.
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110(a)(2)(J) Non-regulatory Documents:

1. Wyoming State Implementation Plan For Class I Visibility Protection Document

a. Original State non-regulatory SIP document submitted to EPA on 9/6/88

b. Approved by EPA 2/15/89; 54 FR 6912

c. Includes WAQSR, Section 28, Visibility

2. 3/3/08 Memorandum From Cynthia Cody, EPA Region 8, clarifications regarding 110 SIP

infrastructure submissions for PM2.5, specifically addressing the current unavailability of EPA rules 

or guidance on PM2.5 implementation through the PSD program

110(a)(2)(J) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 6, Section 4, Prevention of significant deterioration

a. Most recent State regulatory SIP documents submitted to EPA 5/24/12 and 3/8/13

b. EPA final Federal Register 12/6/13; 78 FR 73445

c. EPA final Federal Register 11/22/13; 78 FR 69998

d. Preceding WAQSR, Section 24, Prevention of significant deterioration

i. Original State regulations submitted 1/25/79

ii. EPA approved 7/2/79; 44 FR 38473

2. Chapter 9, Section 2, Visibility

a. Revised WAQSR format EPA approved 7/28/04, 69 FR 44965

b. Preceding WAQSR, Section 28, Visibility

i. Submitted as part of the SIP for Class I Visibility Protection

ii. Approved by EPA 2/15/89; 54 FR 6912

110(a)(2)(J) Comment:

EPA recognizes that States are subject to visibility and regional haze program requirements under part 

C of the CAA. Visibility and regional haze program requirements under part C do not change when a 

new NAAQS becomes effective, and therefore no new visibility obligations are “triggered” for the 

State of Wyoming under section 110(2)(2)(J). 

Wyoming’s process for consultation with government officials, public notification, PSD and visibility 

protection meets the requirements of CAA section 110(a)(2)(J) for the 2010 1-hour NO2 NAAQS.

Air quality modeling/data: Section 110(a)(2)(K) requires that SIPs provide for performing air quality 

modeling for predicting effects on air quality of emissions from any NAAQS pollutant and submission 

of such data to EPA upon request.

110(a)(2)(K) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 6, Section 2, Permit requirements for construction, modification, and operation

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 21, Permit requirements for construction, modification and 
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operation

i. Original State regulations submitted 7/22/74, resubmitted 8/7/74

ii. EPA approved via FR date of 6/10/75

2. Chapter 6, Section 4, Prevention of significant deterioration

a. Most recent State regulatory SIP documents submitted to EPA 5/24/12 and 3/8/13

b. EPA final Federal Register 12/6/13; 78 FR 73445

c. EPA final Federal Register 11/22/13; 78 FR 69998

d. Preceding WAQSR, Section 24, Prevention of significant deterioration

i. Original State regulations submitted 1/25/79

ii. EPA approved 7/2/79; 44 FR 38473

110(a)(2)(K) Comment:

Wyoming’s PSD program requires that estimates of ambient air concentrations be based on applicable 

air quality models specified in Appendix W of 40 CFR part 51, and that modification or substitution of 

a model specified in Appendix W must be approved by the Administrator. 

Wyoming’s air quality modeling and the submission of data programs meet the requirements of CAA 

section 110(a)(2)(K) for the 2010 1-hour NO2 NAAQS.

Permitting fees: Section 110(a)(2)(L) requires SIPs to require each major stationary source to pay 

permitting fees to cover the cost of reviewing, approving, implementing and enforcing a permit.

110(a)(2)(L) Regulatory Documents, Wyoming Air Quality Standards and Regulations (WAQSR):

1. Chapter 6, Section 2, Permit requirements for construction, modification, and operation

a. Most recent State regulatory SIP document submitted to EPA 9/12/2003

b. EPA Final Federal Register 7/28/2004; 69 FR 44965

c. Preceding WAQSR, Section 21, Permit requirements for construction, modification, and 

operation

i. State regulations submitted 11/12/93

ii. EPA approved 11/29/94; 59 FR 60905

2. Wyoming Environmental Quality Act, Section 35-11-211(a), Fees

110(a)(2)(L) Comment: 

The Wyoming infrastructure SIP meets the requirements of CAA section 110(a)(2)(L) for the 2010 1-

hour NO2 NAAQS. 

Consultation/participation by affected local entities: Section 110(a)(2)(M) requires States to 

provide for consultation and participation in SIP development by local political subdivisions affected 

by the SIP.
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110(a)(2)(M) Non-regulatory Document:

1. Intergovernmental Cooperation Document

a. Original State non-regulatory SIP document submitted to EPA on 1/28/72

b. Approved by EPA 5/31/72; 37 FR 10842

110(a)(2)(M) Comment:

The Wyoming infrastructure SIP meets the requirements of CAA section 110(a)(2)(M) for the 2010 1-

hour NO2 NAAQS.