Department of Environmental 9uality 

Matthew H. Mead, Governor 

August 19, 2011 

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

environment for the benefit of current and future generations. 

Mr. James B. Martin 

Regional Administrator 

U.S. Environmental Protection Agency, Region 8 

1595 Wynkoop Street 

Denver, CO 80202-1129 

John Corra, Director 

RE: State Implementation Plan (SIP) Approval Request, Chapter 2, Ambient Standards, Section 

2, Ambient Standards for Particulate Matter, Section 10, Am bien~ Standards for Lead, and 

Section 12, Incorporation by Reference (R-4 and R-18) 

Dear Mr. Martin: 

The Environmental Quality Council of the Wyoming Department of Environmental Quality 

(Council) conducted two public hearings pursuant to 40 CFR §51 .1 02 to consider adoption of revisions 

and additions to the Wyoming Air Quality Standards and Regulations (WAQSR). These hearings were 

conducted in accordance with two separate rulemakings held on February 17, 2000 (R-4) and July 8, 2010 

(R-18). Revisions affecting the State Implementation Plan (SIP) being submitted in this package are 

Chapter 2, Ambient Standards, Section 2, Ambient standards for particulate matter, Section 10, Ambient 

standards for lead, and Section 12, Incorporation by reference. Other chapters affecting the SIP have 

either already been submitted or will be submitted at a later date. 

In the R-4 rulemaking, Chapter 2, Section 2, was revised to adopt the PM2.

5 standard into State 

rule, and to add the word "part" to Section 2(a)(iv). 

The R-18 rulemaking consisted of revisions to Chapter 2, Section 2, which was revised to make 

the State PM2.5 ambient standards consistent with current federal standards, but no more stringent than 

federal standards. Since the EPA has also revised federal rules to remove the annual PM10 standard, the 

State requests that the annual PM10 standard language be removed from the Wyoming SIP. Section 10 of 

Chapter 2 was revised to make the State lead ambient standards consistent with current federal lead 

standards, but no more stringent than federal standards. Section 12 was added to Chapter 2 to consolidate 

all adoption by reference for the chapter in one place. 

After reviewing comments received before or during the hearings, the Council approved the 

proposed R-4 revisions on February 18, 2000 and the proposed R-18 revisions on July 8, 2010. Pursuant 

to the Wyoming Administrative Procedures Act, the revisions were forwarded to the Governor's Office 

for approval and then transmitted to the Secretary of State for filing. The regulations were filed in the 

Secretary of State's Office and became effective March 30,2000 and September 7, 2010, respectively. 

Since all of the necessary State reviews and approvals have been secured, I am submitting two 

copies of the revisions to the State Implementation Plan. 

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

ADMIN/OUTREACH ABANDONED MINES 

(307) 777-7758 (307) 777-6145 

FAX 777-7682 FAX 777-6462 

AIR QUALITY 

(307) 777-7391 

FAX 777-5616 

INDUSTRIAL SITING 

(307) 777-7369 

FAX 777-6937 

LAND QUALITY 

(307) 777-7756 

FAX 777-5864 

SOLID & HAZ. WASTE 

(307) 777-7752 

FAX 777-5973 

WATER QUALITY 

(307) 777-7781 

FAX 777-5973 
Mr. James B. Martin 

August 19, 2011 

Page 2 of3 

The following administrative materials are included in the plan submission and have been 

attached for your review: 

R-4 Rulemaking 

l. A copy of the stamped Certification Page by the Secretary of State indicating the effective date of 

the revisions. The rules became effective on March 30, 2000. 

2. A November 10, 1999 memorandum from Dennis Hemmer, Director of the Department of 

Environmental Quality, to the Governor's Office requesting approval to proceed with rulemaking. 

3. A March 28, 2006 letter from Nancy Vehr, Senior Assistant Attorney General, documenting the 

necessary legal authority under State law to adopt and implement the revised regulations. 

4. A March 1, 2000 review from the Legislative Service Office finding the revised regulations 

within the scope and intent of legislative authority. 

5. A copy of the notice issued by the Air Quality Division for the public hearing with a list of 

newspapers and dates of publication, and a copies of the Advertising Invoice and ad from the 

Casper Star Tribune. 

6. A copy of the Statement of Principal Reasons that was adopted with the rules. 

7. A copy of the summary of comments and responses. 

8. A list of signatures of witnesses present at the February 17, 2000 hearing as well as a copy of the 

agenda. 

R-18 Rulemaking 

1. A copy of the stamped Certification Page by the Secretary of State indicating the effective date of 

the revisions. The rules became effective on September 7, 2010. 

2. A December 9, 2009 memorandum from John V. Corra, Director of the Department of 

Environmental Quality, to the Governor's Office requesting approval to proceed with rulemaking. 

3. An August 2011 letter from Nancy Vehr, Senior Assistant Attorney General, documenting the 

necessary legal authority under State law to adopt and implement the revised regulations. 

4. A July 26, 2010 review from the Legislative Service Office finding the revised regulations within 

the scope and intent of legislative authority. 

5. A copy of the notice issued by the Air Quality Division for the public hearing with a list of 

newspapers and dates of publication, and a copy of the Affidavit of Publication from the Casper 

Star Tribune. 

6. A copy of the Statement of Principal Reasons that was adopted with the rules. 
Mr. James B. Martin 

August 19, 2011 

Page 3 of3 

7. A copy of the summary of comments and responses. 

8. A list of signatures of witnesses present at the July 8, 2010 hearing as well as a copy of the 

agenda. 

Also enclosed are copies of revisions to the Wyoming SIP pertaining to Sections 2, 10, and 12 of 

Chapter 2 in redline and strikeout format, as well as copies of these sections with all revisions 

incorporated from both rulemakings into one clean copy. 

With this submission I am asking for Environmental Protection Agency approval of the revised 

State Implementation Plan for the State of Wyoming to include those specific sections indicated with 

strikeout and redline in the above paragraph regarding Chapter 2, Ambient Standards, Section 2, Ambient 

standards for particulate matter, Section 10, Ambient standards for lead, and Section 12, Incorporation by 

reference. 

If you have any questions regarding this submittal, please feel free to contact Steven A. Dietrich, 

Air Quality Administrator, at 307-777-7391. 

Sincerely, 

Director 

d!:rr~~ Department of Environmental Quality 

Enclosures 

cc: Steven A. Dietrich, Administrator, Air Quality Division w/enc. 

Christine Anderson, Air Quality Division w/enc. 

Carissa Krey, Air Quality Division w/enc. 

Carl Daly, EPA Region 8 

Monica Morales, EPA Region 8