## ILLINOIS ENVIRONMENTAL PROTECTION AGENCY

1021 NORTH GRAND AVENUE EAST, P.O. BOX 19276, SPRINGFIELD, ILLINOIS 62794-9276•(217)782-2829 JAMES R. THOMPSON CENTER, 100WEST RANDOLPH, SUITE 11-300, CHICAGO, IL 60601•(312)814-6026

217/785-4140 2171782-9143 (TDD)

May 16, 2013

Susan Hedman Regional Administrator PAT QUINN, GOVERNOR

U. S. EnvironmentalProtectionAgency, Region 5 77 West Jackson Boulevard (R-19J) Chicago, IL 60604-3507

Re: State Implementation Plan Revision

Dear Ms. Hedman: LiSA BONNETT, DIRECTOR

Certified Mail Return Receipt Requested 7010 2780 0002 1167 5942



### RECEIVED



## MAY 2 22013

Pursuantto Section 169A ofthe Clean Air Act ("CAA'') (42 U.S.C. § 7491) and Section 4 ofthe Illinois EnvironmentalProtectionAct (415 ILCS 5/4), the Illinois Environmental Protection Agency ("Agency") submits the enclosedrevisionto the Illinois State Implementation Plan ("SIP"). This revision has beenprepared as a result ofthe Illinois Pollution Control Board ("Board") granting variances to Midwest Generation, LLC- Waukegan Generating Station ("Midwest Generation") andAmerenEnergyResources ("Ameren"), and the Agency is requesting that these variances be considered for approval individually and as arevisionto the Illinois SIP.

Specifically, onAugust 23, 2012, Midwest Generationwas granted a variance from the provisions ofthe Illinois Combined Pollutant Standard ("CPS"), 35 

### Ill. Adm. Code 225.296(a)(l) and (c)(l), for the 12-monthperiodbeginning December 31, 2013, and ending December 31, 2014, thereby allowing Midwest Generation an extrayear to install pollutioncontrols onUnit 7
at its Waukegan Generating Station. Midwest Generation, LLC- Waukegan Generating Station

v. Illinois EnvironmentalProtectionAgency, PCB 12-121. In addition, on September 20, 2012, Ameren was granted a variance fromboththe 2015 and 2017 sulfur dioxide ("S02") emission
rate provisions ofthe Illinois Multi-Pollutant Standard ("MPS"), 35 

### Ill. Adm. Code 225.233, for the electrical generating units in Ameren's MPS Group from the applicable requirements of35 

### Ill. Adm. Code 225.233(e)(3)(C)(iii) for a periodbeginning January 1, 2015, through December 31, 2019, and 35 

### Ill. Adm. Code 255.233(e)(3)(C)(iv) for a periodbeginning January 1, 2017, through December 31, 2019, subject to certain conditions. Ameren EnergyResources v.lllinois Environmental ProtectionAgency, PCB 12-126.

As youknow, the CPS, which includes Section 225.296(a) and (c), and the MPS, which includes Section 225.233(e), are approved rules ofthe Illinois SIP and were submitted to address the visibilityprotectionrequirements ofSection 169A ofthe CAA, 42 U.S.C. § 7491, and the

Rockford • 4302 N. Main St., Rockford, IL 61103 • (815) 987-7760 Elgin • 595 S. State, Elgm, IL 60123 • (847) 608-3131 Bureau Of Land- Peoria • 7620 N. University St., Peoria. IL 61614 • {309} 693-5464 Collinsville • ,2009 Mall Street, Collinsville, IL 62234 • (618) 346-5120 Des Plaines • 9511 Harrison St., Des Plaines, IL 60016 • (847) 294-4000 Peoria • 5415 N University St., Peoria, IL 61614 • (309} 693-5463 Champaign • 2125 S. First St., Champaign, \L 61820 • (217) 278-5800 Marion • 2309 W. Main St., Suite 116, Marion, IL 62959 • (618) 993-7200

### Regional Haze Rule, as codified in40 CFR § 

### 51.308. See, 

### 77 Fed. Reg. 39943 (July 6, 2012). Accordingly, since Midwest Generation and Ameren sought relieffrom provisions ofthe CPS and MPS and suchreliefwas granted bythe Board, the variances must be submitted for approval

as a SIP revision addressing the visibilityrequirements under the CAA and the Regional Haze Rule.

As evident from the approval ofIllinois' Regional Haze plan, the CPS and MPS provide emissionreductions well in excess ofsimply implementing Best Available Retrofit Technology ("BART") on subject units. Taking into account the variances granted to Midwest Generation and Ameren, the reductions from Illinois' plan continue to provide significantly greater emission reductions for S02 than even very conservative defmitions ofBART for the BART-subject units. See, 

### Attachment 39, AgencyResponse, Tables 1 and 2, at pages 4 and 5.

The Agency provided public notice ofthe SIP revision; however, no public hearing was held, because no request for apublic hearing pursuant to the public notice was received bythe Agency. Public connnents were submitted to the Agency pursuant to the public notice and such connnents are included herein with the Agency's response.

· In order to assist with your review ofthis plan revision submittal, the following documents are

enclosed (one hard copy and one exact duplicate electronic copy ondiscs):

Midwest Generation, LLC**~** Waukegan Generating Station v. Illinois EnvironmentalProtectionAgency



### Attachment 1) Attachment 2) Attachment 3) Attachment 4) Attachment 5) Attachment 6) Attachment 7) Attachment 8) Attachment 9) Attachment 10) Attachment II) Petition for Variance filed by Midwest Generation (April10, 2012) Hearing Officer Order (April30, 2012) Board Order (May 3, 2012) Filing ofAdditional Exhibit to Petition for Variance (May4, 2012) Certification ofPublicationbythe Agency (May 9, 2012) Hearing Officer Order (May 23, 2012) Reconnnendation ofthe Agency (May 25, 2012) Hearing Officer Order (May 30, 2012) Hearing Officer Order (August 9, 2012) Board Order Granting Variance (August 23, 2012) Certificate ofAcceptance filed byMidwest Generation (August 27, 2012)

Ameren EnergyResources 

### v. Illinois Environmental ProtectionAgency



### Attachment 12) Attachment 13) Attachment 14) Attachment 15) Attachment 16) Attachment 17) Attachment 18) Attachment 19) Attachment 20) Attachment 21) Petition for Variance filed byAmeren (May 3, 2012) Certification ofPublicationbythe Agency (May22, 2012) Objection filed byEnvironmental [sic] Illinois, eta!. (May 31, 2012) Objection filed byEnvironment Illinois, eta!. (May 31, 2012) Board Order (June 7, 2012) Notice ofHearing (June 13, 2012) Hearing Officer Order (June 13, 2012) Waiver ofStatutoryDecision Deadline (June 18, 2012) Hearing Officer Order (Questions) (July 5, 2012) Hearing Officer Order (July 11, 2012)Attachment 22) Attachment 23) Attachment 24) Attachment 25) Attachment 26) Attachment 27) Attachment 28) Attachment 29) Attachment 30) Attachment 31) Attachment 32) Attachment 33) Attachment 34) Attachment 35) Attachment 36) Attachment 37) Attachment 38) Attachment 39) Recommendation ofthe Agency (July 23, 2012) Initial Comments ofthe Illinois Attorney General's Office (July 23, 2012) Appearance (July 24, 2012) Hearing Officer Order (Questions) (July 25, 2012) Responses to Board Questions filed byAmeren (July 30, 2012) Responses to Board Questions filed byAmeren (July 30, 2012) Hearing Transcript (August 1, 2012) Hearing Report (August 2, 2012) Comments ofEnviromnent Illinois, eta!. (August 10, 2012) Post-Hearing Comments ofthe Illinois Attorney General's Office (August 10, 2012) Post-Hearing Brieffiled byAmeren (August 15, 2012) Post-Hearing Comments ofthe Agency (August 20, 2012) Post-Hearing Comment filed by Ameren (August 23, 2012) Board Order Granting Variances (September 20, 2012) Certificate ofAcceptance filed by Ameren (October 30, 2012) Notice ofPublic Information, 36 

### Ill. Reg. 17938 (December 21, 2012) No Public Hearing Requested Verification (January 25, 2013) Agency Response to Comments Submittedby Sierra Club (February 13, 2013) and Connnents Submittedby Sierra Club (January 19, 2013)

Iffurther information is required, please contact Gina Roccaforte at 217/782-5544.

Sincerely,

# ~~ Director

Attachments