**IDEM** 

## INDIANA **DEPARTMENT OF**  **ENVIRONMENTAL MANAGEMENT**  **We Protect Hoosiers** **and Our Environment.**

**Michael R.**  **Pence Govenwr** 



### Mr. **Robert Kaplan**  **Acting Regional**  **Administrator U.S.**  **EPA, Region**  **5 77**  **West Jackson**  **Boulevard Chicago,**  **IL 60604-3950** 

**Dear Mr.**  **Kaplan: 100**  **N. Senate**  **Avenue •**  **Indianapolis, IN** **46204 (800)** **451-6027 •**  **(317) 232-8603**  **• www** **.idem.IN.gov**



### January **27, 2016**  **Carol S.**  **Comer Commissioner** 



### Re: **State Implementation**  **Plan Submittal**  **for Indiana**  **Regarding 1-Hour**  **S02 Attainment**  **A.B. Brown**  **Generating Station**  **in Posey**  **County; Request**  **for Parallel**  **Processing (Commissioner's**  **Order #2016-01)** 
**Pursuant to**  **Section 110**  **of the**  **Clean Air**  **Act and**  **Title 13**  **of the**  **Indiana Code,**  **the Indiana**  **Department of**  **Environmental Management**  **(IDEM) submits**  **a request**  **for parallel**  **processing of**  **an amendment**  **to the**  **Indiana state**  **implementation plan**  **(SIP). IDEM**  **requests that**  **United States**  **Environmental Protection Agency**  **(U.S. EPA)**  **approve the**  **requirements for**  **A.B. Brown**  **Generating Station**  **(A.B. Brown)**  **in Commissioner's**  **Order #2016-01.** 

**IDEM issued.** **a Commissioner's**  **Order on**  **January 11,**  **2016, to**  **establish permanent**  **and enforceable**  **sulfur dioxide**  **(S0 2** 

### ) **emission limits**  **for A.B.**  **Brown, located**  **in Posey**  **County, in**  **order to**  **ensure continued**  **attainment of**  **the 2010**  **1-hour sulfur**  **dioxide (S0** **2**

### ) **standard in**  **the area**  **surrounding the**  **facility. The**  **Commissioner's Order**  **contains emission limitations**  **for Units**  **1** 

## & **2, as**  **well as**  **reporting and**  **recordkeeping requirements**  **and method**  **for compliance.**  **The effective**  **date for**  **the emission**  **limitations in**  **the Commissioner's**  **Order is**  **April 19,**  **2016. It**  **contains and**  **meets the**  **requirements set**  **forth in**  **42 U.S.C.**  **§ 7407(d)(3)(E)(iii)**  **and the**  **conditions will**  **become applicable**  **requirements as**  **defined in**  **326 lAC**  **2-7-1 (6).** 

**The rulemaking**  **documentation is**  **being forwarded to**  **U.S. EPA** **with a**  **request for parallel**  **processing while**  **IDEM completes**  **the steps**  **necessary for**  **public notice.**  **When the**  **public notice process**  **is complete,**  **this SIP**  **submittal will**  **be supplemented**  **with an**  **addendum that**  **includes the**  **public notice**  **documentation. The**  **public notice period**  **is scheduled**  **to end**  **on February**  **16, 2016.** 

**An Equal**  **Opportunity Employer**  

# 0

**A State** **that**

## � 

## (!} **Recycled Paper** 

### Mr. **Robert Kaplan** 

**Page 2**  **of 2** 
**This submittal**  **consists of**  **one (1)**  **hard copy**  **of the**  **required documentation.**  **An electronic**  **version of**  **the submittal**  **in PDF**  **format that**  **is identical**  **to the**  **hard copy**  **has been**  **sent Doug**  **Aburano, Chief**  **of U.S.**  **EPA Region**  **5's Attainment Planning**  **and Maintenance**  **Section. In**  **order to**  **assist with**  **your review**  **of this**  **state implementation**  **plan submission,**  **a list**  **of supporting**  **documents is**  **attached. Throughout**  **the development**  **of this**  **Commissioner's Order,**  **staff of**  **the Office**  **of Air**  **Quality worked**  **closely with**  **your staff**  **to ensure**  **that any**  **potential problems**  **that might**  **exist with**  **this requested**  **state implementation**  **plan revision**  **would be**  **resolved. I**  **request that**  **U.S. EPA**  **approve this**  **modification of**  **Indiana's state**  **implementation plan.**  **If you**  **have any**  **questions or**  **need additional**  **information, please**  **contact Scott**  **Deloney, Chief,**  **Air Programs**  **Branch, at**  **(317) 233-5694.** 

**KB/mad Attachments:**  **Supporting Documents**  **Sincerely,**

**Keith Baugues**  **Assistant Commissioner**  **Office of** **Air Quality** 

**cc: Doug**  **Aburano, U.S.**  **EPA Region**  **5 (no**  **enclosures) John**  **Mooney, U.S.**  **EPA Region**  **5 (no**  **enclosures) Steve**  **Rosenthal, U.S.**  **EPA Region**  **5 (no**  **enclosures) Pamela**  **Blakley, U.S.**  **EPA Region**  **5 (no**  **enclosures) John**  **Summerhays, U.S.**  **EPA Region**  **5 (no**  **enclosures) Keith**  **Baugues, IDEM-OAQ**  **(no enclosures)**  **Scott Deloney,**  **IDEM-OAQ (no**  **enclosures) Mark**  **Derf, IDEM-OAQ**  **(no enclosures)**  **Mike Mosier,**  **IDEM-OAQ (no**  **enclosure) Christine**  **Pedersen, IDEM-OAQ**  **(no enclosures)**  **Jessica Reiss,**  **IDEM-OAQ (no**  **enclosures) File**  **Copy**

### Supporting **Documents**

**Attachment A:**  **Administrative Checklist**  **(40 CFR**  **51, Appendix** 

## V) **Attachment B:**  **Commissioner's Order #2015-01**  **Attachment C:**  **Legal Notice**  **of Public**  **Hearing and**  **Certificates of**  **Web Publication**  **Attachment D:**  **Modeling Summary**  **Data, calculations**  **and methodology**  **for determining**  **24-hour rolling**  **average SO** **z emission**  **limits based**  **on A.B.**  **Brown's continuous**  **emission monitoring**  **data (available**  **upon request).** 

# Attachment **A Administrative**  **Checklist ADMINISTRATIVE**  **CHECKLIST** 

## (**40 CFR 51,**  **Appendix V)** 

**1. The**  **submittal is**  **accompanied by**  **a forma1**  **letter of** **submittal from**  **the governor**  **or his**  **designee. 2.**  **Evidence that**  **the State**  **has adopted**  **the plan**  **in the**  **State code**  **or body**  **of regulations;**  **or issued**  **the permit,**  **order, consent**  **agreement ("document");**  **in final**  **fotm.**

**a. Date**  **of adoption**  **or final**  **issuance: b.**  **The effective**  **date of** **the plan,**  **if different**  **from the**  **adoption/issuance date.**  **3. Evidence**  **that the**  **State has**  **the necessary**  **legal authority**  **under state**  **law to**  **adopt and**  **implement the**  **plan. 4.**  **A copy**  **of the**  **actual regulation**  **or document**  **submitted for**  **approval and incorporation**  **by reference**  **into the**  **plan, including**  **the following:** 

**a. Indication**  **of the**  **changes made**  **to the**  **existing approved**  **plan, where**  **applicable. b.**  **The submittal**  **shall be**  **a copy**  **of the**  **official State**  **regulation or**  **document signed,** **stamped, dated**  **by the**  **appropriate state**  **official indicating**  **that it**  **is fully**  **enforceable by** **the State.**  **Effective date**  **shall be**  **stated in**  **the document itself.**  **5. Evidence**  **that the**  **State followed**  **all of** **the procedural**  **requirements of** **the State's**  **laws and constitution**  **in conducting**  **and completing**  **the adoption/issuance**  **of the**  **plan. 6.**  **Evidence that public**  **notice was**  **given, including**  **date of**  **proof of** **publication. 7.**  **Certification that**  **public hearings**  **were held**  **in accordance**  **with information**  **provided in public**  **hearing notice.**  **8. Compilation**  **of public**  **comments and**  **State's response.**  **9. Technical**  **Support Document (if** **source specific**  **change). Enclosed** 
**Attachment** 

## B

**January 11,** **2016 18**  **days after**  **issuance**

**IC 13-14-1-9**  **IC 13-14-2-1**  **Attachment** 

## B

**Attachment** 

## B

**Attachment C**
**Include in**  **Final Addendum** 
**Include in**  **Final Addendum**  **Attachment D** 

# Attachment **B**

**Commissioner's Order**  **for A.B.**  **Brown Generating**  **Station addressing**  **the 1-hour**  **S02 NAAQS**  **Posey County** 

## INDIANA**DEPARTMENT OF**  **ENVIRONMENTAL MANAGEMENT**  **We Protect Hoosie1:s and** **Our Environment.** 

**Michael R.**  **Pence Gm•cnmr**  **100 N.**  **Senate Avenue**  **• Indianapolis,**  **IN 46204** 

**(800) 451·6027**  **• (317)** **232-8603 •**  **\WNI.idem.IN.gov Carol s.**  **Conier Cummt**  **.. tuu�r**  

## STATE **OF INDIANA**  **COUNTY OF** **MARION. )**  **) SS:**  **) BEFORE**  **THE INDIANA**  **DEPARTMENT**

**OF ENVIRONME** 

**NTAL MANAGEMENT**  **IN THE** **MATTER OF:**  **) ORDER**  **OF THE**  **COMMISSIONER )**  **PURSUANT TO** **IC 13-14-2-1**  **) FOR** **A.B. BROWN**  **GENERATING STATION**  **) OF** **INDIANA )**  **)**
**NOTICE AND**  **ORDER OF** **THE COMMISSIONER**  **OF THE**  **DEPARTMENT OF**  **ENVIRONMENTAL MANAGEMENT**  

## This **Notice and**  **Order of**  **the Conunissioner**  **of the**  **Department of**  **Environmental Management**  **("Order") is**  **issued pursuant**  **to Indiana**  **Code ("IC")**  **13-14-1-9, IC 13-14-2-1, and**  **IC 13-14-2-7. During**  **the Commissioner's**  **review, it**  **was determined**  **that the**  **Petition should**  **be granted** **according to**  **the tenns** **specified below:**  **PETITION** 

## Petitioner **is Southern Indiana Gas and**  **Electric Company**  **(SIGECO) A.B. Brown**  **Generating Station**  **("Pet itioner"),**  **a stationary**  **electric power**  **plant with**  **Somce J.D.**  **Number 129-00010,**  **located at**  **8511 Welborn**  **Road in**  **Mount Vernon,**  **Posey County,**  **Indiana, and**  **permitted under** **the Pati** **70 air**  **operating permit program.**  **On March** **2, 2015,** **the U.S.** **District Comt**  **for the** **Northern District**  **of California** **accepted a**  **Consent Decree**  **between the U.S.**  **Envirorunental Protection Agency**  **("U.S. EPA"),**  **the Sierra**  **Club, and**  **the Natural**  **Resources Defense Council**  **to resolve**  **litigation concerning**  **deadlines for**  **completing 1-hour**  **sulfur dioxide**  **("S02") National Ambient**  **Air Quality**  **Standard ("NAAQS")**  **designations. Under**  **the Consent**  **Decree, U.S.**  **EPA must designate**  **certain areas**  **as nonattainment,**  **attainment, or** **unclassifiable in** **tluee phases.**  **The first**  **Consent Decree**  **phase requires U.S. EPA**  **to designate areas**  **that contain**  **stationary sources**  **that had not been**  **announced for**  **retirement as**  **of March**  **2, 2015**  **and either**  **emitted more** **than 16,000**  **tons of** **S02 in** **2012 or** **emitted more**  **than 2,600**  **tons of** **S02 and** **had an**  **annual average**  **emission rate**  **of more**  **than 0.45**  **pounds of** **S02 per**  **one million**  **British thermal**  **units ("lb/MMBtu")** **in 2012,**  **according to** **U.S. EPA's** **Air Quality** **Markets Database.**  **On March**  **20, 2015,**  **U.S. EPA**  **identified five**  **(5) sources**  **in Indiana** **that met** **the criteria**  **for the**  **first phase**  **of Consent**  **Decree designations.**  **U.S. EPA's**  **list included** **the Petitioner, A.B.**  **Brown Generating**  **Station.**

**An Equnl**  **Opportunity Employer** 

# 0 **(i) Recycled** **P11per** 

## A State**that� Commissioner's**  **Order No**  **2016-01**

**Page 2**  **of5**

**On September**  **16, 2015,**  **the Indiana**  **Depaliment of**  **Environmental Management**  **("IDEM") recommended**  **designation of**  **the area**  **smTOunding A.B.**  **Brown Generating**  **Station as**  **attainment. The recommendation was**  **based on**  **modeling that included a**  **petmanent and enforceable**  **S02 emission**  **limitations and** **emission rates**  **at A.B.**  **Brown Generating**  **Station. On**  **December 21,**  **2015, the Petitioner**  **submitted a**  **request to** **the Commissioner**  **to impose**  **permanent and**  **enforceable S02**  **emission limitations**  **and emission**  **rates on** **the Petitioner**  **in order**  **to ensure**  **continued attailll11ent**  **of the**  **S02 NAAQS**  **in the**  **area smTounding**  **A.B. Brown**  **Generating Station.**  **· The**  **Petitioner proposed**  **S02 emission**  **limitations, expressed**  **in S02**  **lb/MMBtu, and**  **emission rates,**  **expressed in**  **S02 pounds**  **per hour**  **("lbllu·"), applicable**  **to both**  **Unit No.**  

## I **and Unit**  **No. 2,**  **as follows:** 
**a. 0.**  **363 lb/MMBtu,**  **twenty-four (24)** **hour rolling**  **average; b.**  **183**

## I**.6 1b** **/lu, twenty-four**  **(24) hour**  **rolling average;**  **and**
**c. 2152.2**  **lb/hr, one** 

## (I)**hour average.**  **FINDINGS Pursuant to**  **IC 13-14-2-l{b)**  **aud IC**  **13-14-2-7(1), the**  **Commissioner may**  **issue Orders**  **to secure**  **compliance with**  **Indiana's environmental**  **statutes and**  **rules, including**  **the ambient**  **air quality**  **standard for**  **S02 at**  **326 Indiana**  **Administrative Code** **("lAC") 1-3-4(b**  **)( l** **)(A). Based**  **on the foregoing**  **information, IDEM** **finds the**  **following: 1.**  **Pennanent and**  **enforceable S02 emission**  **limitations and**  **emission rates**  **for A.B.**  **Brown Generating**  **Station are**  **required in**  **order to**  **model continued**  **attainment of**  **the !-hour**  **S02 NAAQS**  **in the**  **area sunounding**  **the Petitioner.**  **2. Adding**  **S02 emission**  **limitations and**  **emission rates**  **to the Petitioner's**  **Part 70**  **Operating Permit**  **is not**  **adequately permanent**  **to assure continued**  **attainment of** **the S02**  **NAAQS. Instead,**  **a Co** **lllll1 issioner's**  **Order is**  **required to**  **ensure S02**  **emission limitations**  **and emission**  **rates remain**  **permanent and**  **enforceable, as**  **required by** **42 U.S.C.**  **§ 7407(d)(3)(E)(iii).**  **3. Approval by**  **U.S. EPA**  **of the**  **Conunissioner's Order**  **into the Indiana**  **State Implementation**  **Plan ("SIP")**  **is required**  **to make**  **Order requirements**  **federally enforceable.**  **Upon approval**  **into the**  **Indiana SIP, the Order requirements become applicable requirements as**  **defined in** **326 lAC** **2-7-1(6). 4.**  **Based on** **modeling conducted by**  **IDEM, the**  **S02 emission**  **limitations and** **emission rates**  **proposed by** **the Petitioner**  **must be** **clarified and**  **adjusted in**  **order to**  **assure continued**  **attainment of** **the SOz** **NAAQS. Commissione•·'s** **Ot·del' No**  **2016�01**

**Page 3**  **of5**

**ORDER 1.**  **This Order**  **approves the**  **Petition submitted**  **by the**  **Petitioner according**  **to the**  **tetms specified**  **below. This**  **Order imposes**  **on the** **Petitioner the 802**  **emission limitations**  **and emission**  **rates described below.**  **2. When**  **Unit No.**  **1 is**  **operating alone,**  **the unit**  **shall not exceed**  **802 emission**  **limitations and**  **emission rates**  **as follo** **ws:**

**a. 2152.2**  **1b /ln·,**  **one** 

## (I) **hour average**  **or emission rate of**  **0.855 lb/MMBtu,**  **one** 

## (1) **hour average;**  **and b.**  **1831.6 lb/hr,**  **twent y-four**  **(24) hour**  **rolling average**  **or emission**  **rate of**  **0.727 lb/MMBtu,**  **twenty-four (24)**  **hour rolling average. 3.**  **When both**  **Unit No.**  **1 and**  **Unit No.**  **2*** **are in**  **operation, both units**  **shall not**  **exceed combined**  **802 emission**  **limitations and emis** **sion rates**  **as follows:** 

**a. 2152.2**  **lb/hr, one**  

## (I) **hour average**  **or emission**  **rate of**  **0.426 lb/MMBtu, one**  

## (I) **hour average;**  **and b.**  **1831.6 lb/Ju·,**  **twent y-four**  **(24) hour**  **rolling average**  **or emission**  **rate of**  **0.363 lb/MMBtu,**  **twenty-four (24)**  **hour rolling average.**  **4. When**  **Unit No.**  **2*** **is operating alone,**  **the unit**  **shall not**  **exceed S02**  **emission limitations**  **and emission**  **rates as**  **follows:**

**a. 1745.7**  **lb/hr, one**  

## (1) **hour average**  **or emission**  **rate of**  **0.690 lb/MMBtu,**  **one (!)**  **hour average;**  **and b.**  **1485.59 lb/Ju·,**  **twenty-four (24)**  **hour rolling average**  **or emission**  **rate of**  **0.588 lb/MMBtu,**  **twenty-four (24)**  **hour rolling**  **average.** ***Pursuant to**  **PSD (65) 1355**  **issued on**  **February 22, 1979,**  **Unit No.**  **2 shall**  **not exceed**  **an S02**  **emission limitation**  **of 0.69**  **lb/MMBtu, thirty**  **(30) day rolling average.**  **The S02**  **emis sion**  **limitation applies**  **to Unit**  **No. 2**  **whenever Unit No.**  **2 is**  **operating; this**  **includes when**  **Unit No.**  **2 is**  **operating alone**  **and when**  **both Unit**  **No. 1**  **and Unit** **No. 2**  **are in**  **operation. 5.**  **The Petitioner**  **shall comply**  **with the**  **S02 emis** **sion limitations and emission**  **rates beginning**  **April 19,**  **2016. 6.**  **As required**  **by 326**  **lAC 2-7-2(** **d) (l)**  **and 326**  **IAC 2-7-5,**  **the Petitioner shall**  **apply to**  **incorporate Order**  **requirements, including**  **reporting and**  **recordkeeping requirements**  **and methods**  **to determine**  **compliance, into**  **its Part**  **70 Operating Permit within ninety**  **(90) days**  **of U.S.**  **EPA approval**  **of the**  **Commissioner's Order**  **into the**  **Indiana SIP. Commissioner's** **Order No** **2016-01**

**Page 4**  **of5**

**7. From**  **April 19,**  **2016 until**  **IDEM issues**  **a Permit**  **incorporating Order**  **requirements, the**  **Petitioner shall**  **comply with**  **the reporting**  **and recordkeeping**  **requirements and**  **methods to**  **determine compliance** **specified in** **this paragraph.** 
**a. Reporting:**  **The Petitioner**  **shall submit**  **to IDEM,**  **on a**  **quarterly basis,**  **a repmt**  **of the**  **daily maximum twenty-four**  **(24) hour**  **S02 rolling**  **average for**  **Unit No.**  

## I, **for Unit**  **No. 2,**  **and for**  **Unit No.**  

## I **and Unit No.**  **2 combined.**  **b. Recordkeeping:**  **The Petitioner**  **shall maintain**  **records adequate**  **to document**  **compliance with** **the S02**  **emission limitations** **and emission**  **rates.**
**c. Method**  **to determine**  **compliance: Compliance**  **shall be**  **determined by**  **a continuous**  **emission monitoring**  **system in**  **accordance with**  **326 lAC**  **3-5. 8. This**  **Order shall apply**  **to and**  **be binding**  **upon the**  **Petitioner, its**  **successors and**  **assigns. No**  **change in**  **ownership, corporate,**  **or partnership**  **status of** **the Petitioner**  **shall in**  **any way**  **alter its**  **status or**  **responsibilities under** **this Order.**  **9. The**  **requirements of**  **this Order**  **supersede any**  **less stringent**  **requirements applicable to**  **the Petitioner.**  **EFFECTIVE DATE**  **OF ORDER** 

**Pursuant to**  **IC 13-14-2-1(d),**  **IC 4-21.5-3-1,**  **IC 4-21.5-3-5(a)(6),**  **and 40**  **Code of**  **Federal Regulations**  **("CFR") 51.102,**  **IDEM will**  **give notice**  **of this**  **Order to**  **each entity**  **to whom**  **the Order** **is directed**  **and affected** **neighbors by**  **mailing and to**  **the general** **public by web publication.** 

**Pursuant to**  **IC 4-21.5-3-7(a)(3),**  **IC 4-21.5-3-2(e),**  **and IC**  **4-21.5-3-5, this**  **Order may**  **be appealed**  **by filing**  **a Petition**  **for review**  **within eighteen**  **(18) days**  **after the**  **date affected**  **persons were**  **given notice**  **of the**  **Order by**  **U.S. mail.**  **Information on**  **petitions for review**  **of this**  **Order can**  **be found** **at IC**  **4-21.5-3-7. Pursuant**  **to IC**  **4-21.5-3-5(f) and**  **IC 4-21.5-3-2(e),**  **the Order**  **is effective**  **eighteen (18)**  **days from**  **mailing of**  **notice unless**  **a Petition**  **for review**  **has been**  **filed before**  **or on**  **the eighteenth**  **(18 1"** **) day.**  **However, the**  **compliance date**  **for the**  **emission limitations**  **in this**  **Order is**  **April l 9** **, 2016.** 

**Pursuant to**  **40 CFR**  **51.103, IDEM**  **will submit**  **this Order**  **to U.S.**  **EPA as**  **a revision**  **to the**  **Indiana SIP.**  **Upon approval**  **by the**  **U.S. EPA,** **this Order**  **will be** **part of** **the Indiana**  **SIP. Persons**  **seeking judicial**  **review of** **this Order**  **may do** **so in**  **accordance with**  **IC 4-21.5-5.** **Commissioner's Ordet·**  **No 2016-01** 

**Page 5**  **of5**

**If you**  **have procedural**  **or scheduling**  **questions regarding**  **your request**  **for review,**  **you may**  **contact the**  **Office of** **Environmental Adjudication**  **at (317)**  **232-8591. If**  **you have**  **questions regarding**  **this Order,**  **please contact**  **Mark Dert;**  **Office of** **Air Quality,**  **by telephone**  **at (317)**  **233- 5682**  **or email** **at MDERF@idem.IN.gov.**  **Dated at**  **Indianapolis, Indiana**  **this**

# �**day of** **January, 2016.** 

**Commissioner Indiana** **Department of** **Environmental Management** 

# Attachment **C**

**Public Notice**  **and Certificate**  **of Publication**  **for the**  **Commissioner's Order**  **for A.B.**  **Brown Generating**  **Station addressing**  **the 1-hour**  **S02 NAAQS**  **Posey County** **Legal Notice-**  **Public Comment**  **Period and**  **Opportunity for**  **Public Hearing**  **State Implementation**  **Plan (SIP)**  **Submittal A.B.**  **Brown Generating Station**  **in Posey**  **County**

**Commissioner's Order**  **No 2016-01**  **Notice is**  **hereby given**  **under 40**  **CFR 51.102**  **that the**  **Indiana Department**  **of Environmental**  **Management ("IDEM")**  **is accepting**  **written comments**  **and providing**  **an opportunity**  **for a**  **public hearing**  **regarding a**  **revision to**  **the Indiana**  **state implementation**  **plan (SIP)**  **for Southern**  **Indiana Gas**  **and Electric Company,**  **A.B. Brown**  **Generating Station, Source**  **I.D. Number**  **129-00010, located**  **at 8511**  **Welborn Road**  **in Mount**  **Vernon, Posey**  **County, Indiana.**  **All interested**  **persons are**  **invited and**  **will be**  **given reasonable**  **oppmiunity to**  **express their**  **views concerning**  **the proposed**  **revision to**  **the SIP.**  **The purpose**  **of this**  **notice is**  **to solicit**  **public connnent**  **on a**  **proposed revision**  **to the**  **SIP that**  **is accomplished**  **by Commissioner's**  **Order No.**  **2016-01 for**  **A.B. Brown**  **Generating Station. The**  **Commissioner's Order**  **imposes sulfur**  **dioxide emissions limits**  **and emissions**  **rates upon**  **A.B. Brown**  **Generating Station.**  **This Commissioner's**  **Order will**  **be submitted**  **to the**  **United States Environmental**  **Protection Agency ("U.S. EPA")**  **for approval**  **as a**  **revision to**  **the Indiana**  **SIP. Any**  **person may**  **submit written**  **comments on**  **the proposed**  **SIP revision.**  **Written comments**  **must be**  **postmarked or**  **delivered in**  **person on** **or before**  **February 16,** **2016. Any**  **person may**  **request a**  **public hearing**  **on the**  **proposed SIP**  **revision. Requests**  **for a**  **public hearing**  **must be**  **submitted on**  **or before**  **February 16,**  **2016. If** **no timely**  **request for**  **a public**  **hearing is**  **received, a**  **hearing will**  **not be**  **held. If** **a hearing**  **is scheduled,** **another legal**  **notice will**  **be published**  **stating the**  **date, time,** **and location**  **of the**  **meeting. Interested**  **parties may**  **present oral**  **or written**  **comments at**  **the public**  **hearing, if** **held. Comments**  **and suppotiing**  **documentation, or**  **a request**  **for a**  **public hearing**  **must be**  **sent in**  **writing to**  **Mark Derf** **via the**  **information provided**  **below. Interested**  **pmiies can**  **also contact**  **Mark Derf** **to see**  **if a**  **hearing has**  **been scheduled.**  **Please refer**  **to Commissioner's**  **Order 2016-01**  **in all**  **con·espondence.**

**Mark Derf**  **Indiana Depmiment**  **of Environmental**  **Management Office**  **of Air**  **Quality** 

## I**00 North**  **Senate Avenue**  **Mail Code**  **61-50 IGCN**  **1003 Indianapolis,** **Indiana 46204**  **Phone: (317) 233-5682** 

**. Fax:**  **(317) 233-2342**  **E-mail: MDERF@idem.IN.gov.** **A copy**  **of the Commissioner's**  **Order is**  **available to**  **any person**  **upon request**  **and is**  **available for** 

**public inspection**  **at the**  **following locations:** 

**Indiana Department**  **of Environmental**  **Management Office**  **of Air**  **Quality Indiana**  **Government Center-Notth**  **100 North**  **Senate Avenue**  **lOth Floor**  **Indianapolis, Indiana**  **46204. and**  **Indiana Department**  **of Environmental**  **Management Southwest**  **Regional Office**  **1 120**  **Notth Vincennes Avenue Petersburg,** **Indiana 47567.**  **and Alexandrian Public**  **Library 115 West**  **Fifth Street**  **Mount Vernon,** **Indiana 4** **7620. The**  **Commissioner's Order**  **is also**  **available on**  **the IDEM**  **website at:**  **http://www.in.gov/idem/4686.htm. For**  **additional information,** **please contact**  **Mark Derf** **at the**  **contact information**  **provided above.** **INDIANA DEPARTMEKT**  **OF ENYIRO!\:li!El\:'TAL** **MANAGEMENT W" Prorc;ct** **Hoosillr.i and Our** **Em,ironm"nt.**

**MIDhfll R. Pen!lll (il.>..:nult**  **100 N. SMale AVffii.E •**  **lnl£-anapors, IN 4&20:!l** 

**(ll00)451-&127 •**  **(311�232 ...e6** **D3 •**  **WA"NldEmJt�.g<Jll**

**January 13,2016** 

**CERTIFICATE OF**  **PUBLICATION e;,...-o� a. Comor**  **C.moti.�l.\r..o�**

**This is**  **to certify** **that the** **Indiana Department**  **of Envirorunental**  **Management (IDEM)**  **notice of**  **public comment period and** **opportunity for**  **a Public** **Hearing regarding the**  **following:**

**• Commissione•·ts**  **Order #2016-0l**  **fo1· A.B.**  **Bro1rn Gtntl'ating** **Station of**  **Indiana**
**was published**  **on IDEM's**  **web site** **on January**  **13, 2016.**  **It is**  **•�'Peeled that**  **it will**  **remain posted**  **on the**  **site until**  **at l e**  **ast Febm:uy**  **16, 2016.**  **The notice** **in fnll was**  **also made**  **available the**  **same day** **online at**  **the following**  **web address,**  **under "Commissioner's**  **Orden;"_ http://wmv.ingovlidem/4686.h1m**  **Web publication**  **of the** **notice was**  **at the**  **request of**  **Scott Deloney, Branch**  **Chief, Programs**  **Branch, Office**  **of Air** **Quality, IDEM.** 

**Attachments: Copy**  **of web**  **page as**  **published**

**All Eqn! Oppurtullity :Emplo-yw**  **By:**

**Mike Finklestein IDEM**  **Webmaster**

# Attachment **D**

**A.B. Brown**  **Generating Station:**  **Modeling Summary**  **Posey County** 

## A.B. **Brown Generating**  **Station Modeling**  **Summary for**  **Commissioner's Order**  **#2016-01 Background**  **Initial modeling,**  **using hourly**  **continuous emissions**  **monitoring (CEM)**  **data from**  **2012-2014, showed**  **higher modeled**  **!-hour sulfur**  **dioxide (SOz)**  **concentrations. Modeling**  **for A.B.**  **Brown, using**  **Mercury and**  **Air Toxics**  **Standard (MATS)**  **S02 compliance**  **emission rates,**  **was then**  **provided in**  **Indiana's Preliminary**  **Recommendations Concerning**  **Round 2**  **Air Quality**  **Designations for**  **the 20** 

## I**0 Primary**  **!-hour SOz**  **Standard submitted**  **to United**  **States Environmental**  **Protection Agency**  **for review/consideration**  **on September**  **16, 2015.** **1 Since**  **A.B. Brown decided**  **to use**  **the hydrochloric**  **acid (HCl) emission limit**  **to comply**  **with the**  **MATS instead**  **of the**  **SOz emission**  **limits, those**  **rates could**  **not be**  **used and**  **would not**  **satisfy the**  **Consent Decree.**  **As requested**  **by A.B.**  **Brown, IDEM**  **issued a**  **Commissioner's Order**  **on January**  

## II, **2016, to**  **establish permanent and**  **enforceable sulfur**  **dioxide (S02)**  **emission limits**  **for A.B.**  **Brown in**  **order to**  **ensure continued**  **attainment of** **the 2010**  **primary !-hour**  **S02 standard**  **in the**  **area surrounding the facility.**  **The Commissioner's**  **Order contains emission**  **limitations and**  **emission rates**  **for Units**  

## I & **2, as**  **well as**  **reporting and**  **recordkeeping requirements**  **and method**  **for compliance.**  **Modeled Limits**  **The Commissioner's**  **Order limits**  **A.B. Brown's**  **S02 emissions**  **to 0.855**  **lbs S02/MMBtu**  **(pounds per**  **one million**  **British thermal**  **units) for**  **Unit** 

## I **and 0.69 lbs**  **S02/MMBtu limit**  **for Unit**  **2 when**  **operating alone**  **based on**  **a 1-hour**  **S02 averaging**  **time. Both**  **units can**  **never exceed**  **2,152.2 lbs**  **SOz/hr. (0.426**  **lbs SOz/MMBtu)**  **when operating together. Therefore,**  **Indiana modeled**  **the S02**  **proposed emission**  **limitations recommended**  **by A.B.**  **Brown. Five**  **scenarios were**  **modeled. Modeled**  **concentrations for**  **all five**  **of A.B.**  **Brown's operating**  **scenarios were**  **added to**  **the temporally**  **varying seasonal SOz**  **background concentrations,**  **as well**  **as the**  **emission limitations**  **and emission**  **rates for**  **all five**  **scenarios as**  **outlined in**  **Table 1.**  **The worst**  **case operating**  **scenario was**  **Scenario 5:**  **Unit 2**  **operating at**  **0.69 lbs**  **SOz/MMBtu and**  **Unit** 

## I **operating at**  **0.161 1bs**  **SOz/MMBtu. Again,**  **both units,**  **when operating,**  **cannot exceed**  **2,152.2 lbs**  **S02/hr. Since that**  **is the**  **case, Unit**  

## I **cannot operate**  **at full**  **capacity when**  **Unit 2**  **is running**  **at 0.69 lbs**  **SOz/MMBtu. Also,**  **when Unit**  **1 is**  **operating at**  **0.855 lbs**  **S02/MMBtu, Unit 2**  **cannot be operating.**  **Table 1**  **Scenaro 1**  **Scenario 2**  **Scenario 3**  **Scenario4 Scenario**  **5 Group**  **ID Emission**  **Rate Bl**  **BGAII Bl**  **GOAII 43_AII**  **B2 GOAII**  **B2 69AII**  **Boilerl lb/MMBtu**  **0.854725973 0.6**  **0.4275 0.256417792 0.161437649**  **Boiler2 lb/MMBtu** 

**- 0.253517787**  **0.4275 0.595470356**  **0.69 Boilerl**  **Modeled lb/hr**  **2152.2 1510.8**  **1076.445 645.66**  **406.5 Boiler2**  **Modeled lb/hr**  **641.4 1081.575**  **1506.54 1745.7**  **Total lb/hr**  **2152.2 2152.2**  **2152.2 2152.2**  **2152.2 Concentration**  **ug/m3 188.64213**  **190.57711 193.45872**  **194.71424 195.51998**  **1 http://www.in.gov/idem/airgualitv/2432.htm**  

## I**All other**  **modeling parameters**  **for A.B.**  **Brown were**  **maintained from**  **the Consent**  **Decree**

**modeling included**  **on Pages**  **19-23 of** **Enclosure 3**  **oflndiana's Preliminary**  **Recommendations Concerning**  **Round 2**  **Air Quality**  **Designations for**  **the 2010**  **Primary 1-hour**  **S02 Standard.** 

**2**