### DEPT. OF ENVIRONMENTAL CONSERVATION OFFICE OF THE COMMISSIONER

CERTIFIED MAIL: 7003 1680 0004 2906 3016 Return Receipt Requested

September 29, 2010

Dennis McLerran, Regional Administrator U.S. EPA Region 10 1200 6 th Avenue, Suite 900 (Mail Stop RA-140) Seattle, WA 98101

Dear Mr. McLerran:

This letter provides for your approval amendments to Alaska’s State Air Quality Control Plan or State Implementation Plan (SIP), adopted by reference into the Alaska Administrative Code (AAC) at 18 AAC 50.030, with an effective date of October 29, 2010. The revisions primarily affect the state’s vehicle inspection and maintenance program and Anchorage’s carbon monoxide maintenance area plan, which are contained in Volume II, Sections III.A and III.B of Alaska’s SIP, respectively. These amendments also include adopting by reference the Eagle River PM-10 Limited Maintenance Plan contained in Volume II, Section III.D.2 of Alaska’s SIP; and adopting by reference the Department’s Quality Assurance Project Plan for the State of Alaska Air Monito ring & Quality Assurance Program . With the submittal of these SIP revisions, the State of Alaska is requesting that EPA upon approval of the PM-10 limited maintenance plan, formally re-designate the Eagle River PM-10 non-attainment area as an attainment area.

We are providing three paper copies and one electronic version of the following documents to Gina Bonifacino of your staff:

• Alaska Administrative Code, Title 18, Chapter 50 Air Quality Control with an effective date of October 29, 2010, to be published in Register 196, January 2011.

• Sections of the State Air Quality Control Plan , adopted by reference under 18 AAC 50.030 as amended August 20, 2010, including:

• Volume II. Section II: Air Quality Control Program;

• Volume II. Section III.A: Statewide Carbon Monoxide Control Program;

• Volume II. Section III.B: Anchorage Transportation Control Program;

• Volume II. Section III.D.2: Eagle River PM-10 Limited Maintenance Plan;

• Volume III, Appendices to Volume II (includes 18 AAC 50 regulations); and SEAN PARNELL, GOVERNOR

410 Willoughby Avenue, Suite 303 Post Office Box 111800 Juneau, Alaska 99811-1800 Phone: 907-465-5066 Fax: 907-465-5070 www.dec.state.ak.usDennis McLerran 2 September 29, 2010

G:\COMM\WP\2010\10.214 Amendments SIPAnchorage CO-PM10.docx

• Quality Assurance Project Plan for the State of Alaska Air Monitoring & Quality Assurance Program.

The following supporting documents are also being provided:

1. Signed Adoption Order and certified Filing Certificate for Permanent Regulations, filed September 29, 2010 with an effective date of regulation October 29, 2010, along with appropriate delegations; 2. Notice of Public Comment, signed June 28, 2010; 3. Affidavits (3) of Publication for the Public Notice; 4. Affidavit of Agency Record of Public Comment, signed August 9, 2010, indicating no written public comments were received; 5. Affidavit of Oral Hearing, signed September 10, 2010; 6. Public Hearing Transcripts and Certification of Public Hearing, signed August 3, 2010; 7. Affidavit of Notice of Proposed Adoption of Regulations and Furnishing of Additional Information, signed August 20, 2010; 8. Public Review Draft of 18 AAC 50 regulations which shows the changes made to the regulations, with bold lettering as new language and bracketed language as old language, dated June 28, 2010; and 9. A copy of the tracked regulation amendments prepared by the Department of Law in their transmittal packet to the Lt. Governor for filing, dated September 27, 2010.

Mr. Scott Sloane is available to your staff to respond to questions or to otherwise assist. He can be phoned at (907) 465-5176. As always, I would be pleased to discuss any of this with you.

Sincerely,

Larry Hartig Commissioner

Enclosures

cc: Steve Morris, Municipality of Anchorage (w/enclosures) Rick Albright, EPA Region 10 (w/o enclosures) Gina Bonifacino, EPA Region 10 (w/ enclosures) Alice Edwards, Acting Director, Division of Air Quality, ADEC (w/o enclosures) Cynthia Heil, Acting Program Manager, ANPMS Program, ADEC (w/o enclosures)