# Air Resources Board Mary D. Nichols, Chairman

1001 1 Street P.O. Box 2815 Linda S. Adams

Secretaw for Sacramento, California 95812 www.arb.ca.gov Arnold Schwarzenegger Govemor



### May 28,201 0

Mr. Jared Blumenfeld Regional Administrator U.S. Environmental ProtectionAgency Region9 75 Hawthorne Street San Francisco, California 94105 Dear Mr. Blumenfeld: The Air Resources Board (ARB) requeststhat the U.S. Environmental Protection Agency (U.S. EPA) initiate parallel processing of the attached 2010 PMIO Maintenance Plan and Redesignation Requestfor the Coso Junction Planning Area (Coso Junction). Monitored PMIO air quality data from the years 2006-2008 demonstratesthat Coso Junction attains the 24-hour PMIO standard. In addition, data for 2009 and preliminary data for 2010 shows continued attainment of the PMIO standard. The Great Basin UnifiedAir Pollution Control District Board approved the plan at its May 17, 2010 meeting. ARB will consider approval of the plan at our June 24, 2010 Board hearing. We are requesting that the U.S. EPA begin parallel processing of this plan prior to ARB'S hearing. ARB is preparedto expedite its action and the submittal to U.S. EPA. If you have any questions, please call LynnTerry, Deputy Executive Officer, at (916) 322-2739! or have your staff contact Karen Magliano, Chief,Air Quality Data Branch, at (91 6) 322-7137.

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## - James 

### N. ~oldstene Executive Officer Enclosures (4)

cc: See next page.

The energychallenge facing Californiais real. Evew Californian needs to take immediate action to reduce energy consumption. For a list ofsimple waysyou can reduce demand and cutyour energy costs, see our website: http:llwww.arb.ca.aov. 

### California Environmental ProtectionAgency Printed on Recycled Paper

### Mr. Jared Blumenfeld May 28,2010 Page 2

cc: (W/O enclosures) DeborahJordan, Director U.S. Environmental ProtectionAgency Air Division 

### - Region 9 75 Hawthorne Street San Francisco, California 94105 Mr. Theodore D. Schade Air Pollution Control Officer Great Basin Unified Air Pollution Control District 157 Short Street Bishop, California 9351 4-3537 LynnTerry Deputy Executive Officer Executive Office Karen Magliano, Chief Air Quality Data Branch Planning and Technical Support Division

### Mr. Jared Blumenfeld May 28,2010 Page 3



### bcc: Via email (wlout enclosures) Ms. Lisa Hanf, Chief U.S. Enviror~mental ProtectionAgency Planning Office Air Division

### - Region 9 75 Hawthorne Street San Francisco, California 94105 Ms. Sarvy Mahdavi U.S. Environmental ProtectionAgency Air Division

## - Region 9 75 Hawthorne Street San Francisco, California 94105 I-inda Murchison, PTSD Sylvia Zulawnick, PTSD Elizabeth Melgoza, PTSD (Hard copies) EO 

### (2) PTSD C hron (w1Attachment) SIP Library (w1Attachment) Assignment 

### # 7790115752 X:\SIP Plans\Coso Junction PMIO SIP\request parallel process.docTheodore D. Schade Air Pollution ControlOfficer


## GREAT BASIN UNIFIED AIRPOLLUTION CONTROL DISTRICT 157Short Street, Bishop, California93514-3537 760-872-8211 Fax: 760-872-6109



### NOTICE OF PUBLIC HEARING ADOPTION ANDAPPROVAL OF2010 PMlOMAINTENANCE PLANAND REDESIGNATION REQUEST FOR THE COSOJUNCTION PLANNING AREA 

### PLEASE TAKE NOTICE that the Governing Board of the Great Basin Unified Air Pollution Control District (GBUAPCD) will conduct a public hearing and consider for adoption the 2010 PMI 0 Maintenanceplan andRedesignation Request for the CosoJunction Planning Area (Coso PMlO Plan). The public hearing, and the Governing Board's consideration for adoption, will occur at the District Governing Board's regular meeting on Monday, May 

### 17, 2010 at 10:OO a.m. in the Mono County Supe~isors Chamber, Mono County Courthouse, 2ndFloor, Main Street (Highway 399,Bridgeport, California 93517. The public hearing on the Coso PMlO Plan is set for 10:15 a.m. The Coso PMlO Plan includes 1) a request to redesignate the area from nonattainment for the National Ambient Air Quality Standard for PMlO (federal standard) to attainment based on monitoring data and a modeling analysis, and 2) a maintenance plan that contains requirements to ensure the federal standard will not be violated in the future. Other actions related to the adoption of the Coso PMlO Plan may also be taken at the meeting. Members of the public will have an opportunity to submit written comments or make oral statements at the public hearing. The Coso PMlO Plan is available for public review at the GBUAPCD's Bishop Office, 157 Short Street, Bishop, California, 93514, at the GBUAPCD web-site: www.gbuapcd.org, and at Inyo County Libraries in Independence, Big Pine, Bishop, Lone Pine, Death Valley and Tecopa, California. Copies of the Coso PMlO Plan on CD are free of charge upon request. Hardcopies are available at reproduction cost ($25) and free of charge to Inyo, Mono and Alpine County residents. Written comments are invited, and should be addressed to Theodore D. Schade, Air Pollution Control Officer, Great Basin Unified Air Pollution Control District, 157 Short Street, Bishop, CA 935 14. Written comments received by the close of business Wednesday, April 28, 2010, will be included in the staff report sent to the Governing Board members. Comments may also be made during the public hearing. For further information, call the District's Board Clerk, Tori DeHaven at (760) 872-821 1.

lnyo Register: April 1 and April 15,2010 Mammoth Times: April 2,2010 Tahoe Daily Tribune: April 2,2010 Daily Independent: April 1 and April 15,2010