## ILLINOIS ENVIRONMENTAL PROTECTION AGENCY 1021 North Grand Avenue East, P.O. Box 19276, Springfield, Illinois 62794-9276 • (217) 782-2829 James R. Thompson Center, 100 West Randolph, Suite 11-300, Chicago, Il60601 • (312) 814-6026 PAT QUINN, GOVERNOR DOUGLAS P. SCOTT, DIRECTOR 217/785-7449 217/782-9143 (TDD)

July 23, 2009

Mr. BharatMathur Deputy Regional Administrator Office ofthe Regional Administrator, R-19J U. S. Environmental Protection Agency, Region 5 77 WestJackson Boulevard Chicago, illinois 60604-3507 

### RECEIVED 

## JUL 31 2009 U.S. EPA REGION 5 OFFICEOFREGIONALADMlNISTRAroR

Re: 8-hour Ozone Redesignation Requestfor Chicago

# De~: The Illinois Environmental Protection Agency (illinois EPA), on behalfofthe State ofIllinois, hereby requests that the Illinois portion ofthe Chicago ozone nonattainment areabe redesignated to attainment ofthe 8-hourozone standardpromulgated in 1997. The Chicago ozone nonattainment area consists ofCook, Lake, DuPage, McHenry, Kane, Will, andportions of Grundy and Kendall counties in Illinois, as well as Lake and Portercounties in northwest Indiana. The Illinois EPA understands that the State ofIndiana is making a similarredesignation request. Ambient airmonitoring data collectedby the illinois EPA in the Chicago nonattainment areafrom 2006 through 2008, as well as datacollected in northwest Indiana and southeast Wisconsin, demonstrates thatthe areais currently meeting the 1997 8-hourozone NAAQS. In addition, the area has met all ofthe relevantrequirements under Section 107, Section 110, and PartD ofthe Clean 

### Air Act (CAA), with the exception ofrevised RACT rules for certain source categories which will be submitted soon. The Illinois EPA hereby submits a Maintenance Plan for the Chicago ozone nonattainment area pursuantto Sections 107(d)(3)(E), IlO(a)(2), and 175A ofthe CAA. Also included are revised year 2020 motor vehicle emissions budgets developed using the MOBILE.model. The Maintenance Plan SIP submittal and the motor vehicle emissions budgets are required as partof the illinois EPA's redesignation request. The Maintenance Plan provides the supporting information for this request, consistent with the criteria for redesignation setforth in Section 175A ofthe CAA. The Maintenance Plan constitutes a revision ofillinois' SIP for ozone. Accordingly, the illinois EPA held a public hearing in Chicago on December 16,2008, to accept comments on the draft

Rockford. 4302 N. Main St., Rockford, Il61103. (815) 987-7760 Elgin. 595 5. State, Elgin, Il60123. (847) 606-3131 Bureau ofland

- Peoria• 7620 N. Vniversity St., Peoria, Il 61614 • (309) 693-5462 CoIIinm"e. 2009**Mafl5tree~** Collinsville, IL 62234. (618) 346-5120 Des Plaines. 9511 W. Harrison 5t., Des Plaines, Il 60016. (847) 294-4000 Peoria. 5415 N. University St., Peoria, Il61614. (309) 693-5463 Olampaign • 2125 5. First St., Champaign, IL 61.820 • (217) 276-5800 Marion. 2309 W. Main 5t., Suite 116, Marion, IL 62959. (618) 993-7200 Printed on Recycled Paper

### Maintenance Plan. The lllinois EPA received comments both atthe hearing and during the subsequent 30 day commentperiod. The enclosed Responsiveness Summary summarizes the comments received and the lllinois EPA's revisions to the Final Maintenance Plan to address the comments. In orderto assist with yourreview ofthe Chicago Maintenance Plan SIP submittal, the lllinois EPA has included the following documents: Attachment 1)

Attachment 2) Attachment 3) Attachment4) Attachment 5) Attachment 6) DraftMaintenance Plan for the lllinois Portion ofthe Chicago Ozone NonattainmentAreafor the 1997 8-Hour Ozone National AmbientAir Quality Standard, AQPSTR 08-08, Illinois EPA, November 15, 2008. Notice ofPublic Hearing, November 15,2008. Hearing Sign-in Sheet. Transcript ofPublic Hearing held onDecember 16, 2008. Responsiveness Summary, Illinois EPA, March 18,2009. Final Maintenance Plan for the lllinois Portion of the Chicago Ozone Nonattainment Area for the 1997 8-Hour Ozone National Ambient Air Quality Standard, AQPSTR 09-04, lllinois EPA, AprilS, 2009. lllinois EPA believes that this submittal, in conjunction with other submittals made to the U.S. EPA (e.g., attainment plans, rate ofprogress plans, and requests for SIP completeness findings with supporting information), will allow the U.S. EPA to expeditiously take the necessary actions to redesignate the Chicago area to attainment for the 1997 8-hour ozone National Ambient Air Quality Standard. 

### If further information is required or should you have any questions, please feel free to contact Laurel L. 

### Kroack, Chiefofthe Bureau ofAir. Very truly yours,

# ~Jl~**~~** Douglas P. Scott Director Attachments

cc: Cheryl L. 

### Newton, U.S. EPA Region 5 John Mooney, U.S. EPA Region 5

G:/rob/8-hourozone Redesignation (Jul 09)