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### , \ '\ 1\ , It". :' 1 SEANPARNELL, GOVERNOR J 

### If**t~** 410 Willoughby Avenue, Suite 303 Post Office Box 111800 

### DEPT. OF ENVIRONMENTAL CONSERVATION Juneau, Alaska 99811 1800 Phone: 907-465-5066 

### OFFICE OFTHE COMMISSIONER Fax: 907-465-5070

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CERTIFIED MAIL: 7007 0710 0003 6151 7409 

### Return Receipt Requested OFFICE OFTHE EXECUTIVE April 9, 2010 Dennis McLerran, Regional Administrator U.S. EPA Region 10 1200 6th 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 (SIP), adopted by reference into AlaskaAdministrative Code (AAC) at 18 AAC 50.030, with an effective date ofApril 1, 2010. The amendments include the adoption ofthe primary and secondary National Ambient Air Quality Standards for fine particulate matter (PM2.5), ozone and lead, as well as the adoption ofthe federal methods for monitoring and measuring PM2.5, ozone and lead in ambient air. These amendments also include adopting by reference the federal transportation conformity regulations, and revisions to Alaska's Transportation Conformity plan contained in Volume II, Section III.I ofAlaska's SIP. We are providing three (3) paper copies and one electronic version ofthe following documents to Krishna Viswanathan ofyour staff:

• Alaska Administrative Code, Title 18, Chapter 50 Air Quality Control with an effective date ofApril 1,2010, to be published in Register 193, April 2010 • Sections ofthe 

### StateAirQuality Control Plan, adopted by reference under 18 AAC 50.030 as amended November 6,2009, including: • Volume II, Section IlI.I. Transportation Conformity The following supporting documents are also beingprovided: 1. Signed Adoption Order and certified FilingCertificate for Permanent Regulations, filed March 2, 2010 with an effective date ofregulation April 1, 2010; 2. Notice ofPublic Comment, signed August 14, 2009; 3. Affidavits (3) ofPublication for the Public Notice;Dennis McLerran 2 Apri19, 2010

4. Affidavit ofAgency Record ofPublic Comment (signed September 28, 2009) indicating written public comments were received; 5. Affidavit ofOral Hearing, signed September 23, 2009; 6. Public HearingTranscripts and Certification ofPublic Hearing, signed September 26, 2009; 7. Affidavit ofNotice ofProposed Adoption ofRegulations and Furnishing of Additional Information, signed September 28, 2009; 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 August 14, 2009; 9. A copy ofthe tracked regulation amendments prepared by the Department of Law in their transmittal packet to the Lt. Governor for filing, dated February 23, 2010; and 10.Response to Public Comments on proposed regulation changes to 18 AAC 50, dated October 15, 2009. Ifyou oryour staffhave any questions or need additional information regarding these amendments, please contact Scott Sloane at (907) 465-5176. Sincerely,

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# ~Hartig Commissioner

cc: RickAlbright, EPA Region 10 (wJo enclosures) Donna Deneen, Acting Unit Manager, EPA Region 10 (wJo enclosures) KrishnaViswanathan, EPA Region 10 (w

### Jenclosures) Alice Edwards, Acting Director, Division ofAir Quality, ADEC (w

### J 0 enclosures) Cynthia Heil, Acting Program Manager, ADEC (wJo enclosures)