### Indiana **Department of**  **Environmental Management** 

**Michael R.**  **Pence Governor** 

**Mr. George**  **Czerniak Air**  **Division Director**  **We Protect**  **Hoosiers and Our** **Environment.**
**100 N.**  **Senate Avenue**  **• Indianapolis,**  **IN 46204**  **(800) 451-6027**  **• (317)**  **232-8603 •**  **www .idem.IN.gov** 

**February 11,2016**  **Carol S.**  **Comer Commissioner** 

**U.S. Environmental**  **Protection Agency**  **Region 5**  **77 West**  **Jackson Boulevard**  **Chicago, IL**  **60604-3950**

**Dear Mr.**  **Czerniak: Re:**  **RACM/RACT Determination**  **for Indiana's Portion**  **(Lawrenceburg Township,**  **Dearborn County)**  **of the**  **Cincinnati Hamilton,**  **OH-KY-IN 1997**  **Annual Fine**  **Particle Non** **attainment Area** 

**Pursuant to**  **Section 172(c)(1)**  **of the Clean** **Air Act**  **(CAA), the**  **Indiana Department**  **of Environmental**  **Management (IDEM)**  **submits supporting**  **information regarding**  **Reasonably Available**  **Control Measures**  **(RACM)/Reasonably Available**  **Control Technology**  **(RACT) for**  **Indiana's portion**  **(Lawrenceburg Township,**  **Dearborn County)**  **of the**  **Cincinnati-Hamilton, OH-KY-IN,**  **1997 annual**  **fine particle**  **nonattainment area.**  **Section 172(c)(1)**  **of the**  **CAA requires**  **a demonstration**  **that the**  **State has**  **adopted all**  **reasonable and**  **available control**  **measures to**  **demonstrate attainment**  **as expeditiously** 
**as practicable**  **and that**  **no additional**  **measures are**  **reasonably available**  **that will**  **or would**  **have advanced**  **the attainment**  **date. IDEM**  **submitted a**  **final Redesignation**  **Petition and**  **Maintenance Plan**  **for Lawrenceburg**  **Township to**  **U**

**. S.**  **EPA on**  **January 25,**  **2011. U.S.**  **EPA subsequently**  **redesignated Lawrenceburg**  **Township to**  **attainment and**  **classified it**  **as maintenance**  **under the**  **1997 annual**  **fine particle standard on**  **December 23,** **2011 (76 FR**  **80253).**

**This letter**  **is in**  **response to**  **the federal**  **Sixth Circuit**  **Court of** **Appeals' March**  **18, 2015,**  **vacatur of**  **U.S. EPA's**  **conclusion that**  **the Cincinnati-Hamilton**  **metropolitan area**  **had attained** **the 1997**  **annual fine**  **particles (PM2.5)**  **standard. The**  **Sierra Club**  **challenged U.S.**  **EPA's determination**  **because they**  **believed that**  **the states**  **of Indiana**  **and Ohio**  **had declined**  **to develop**  **rules imposing**  **RACM /RACT**  **for fine**  **particles on**  **sources within**  **the area.**  **The court**  **agreed with**  **this argument**  **and held**  **that Indiana**  **and Ohio's failure**  **to impose**  **RACM/RACT invalidated**  **U.S. EPA's**  **conclusion that**  **the states'**  **portion of**  **the Cincinnati**  **nonattainment area**  **was in**  **attainment of** **the standard.**  **The court's**  **decision did**  **not implicate Kentucky's portion**  **of the**  **nonattainment area for**  **procedural reasons.**

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

# 0

**Please Reduce,**  **Reuse, Recycle**  **A State that** **� Mr.**  **George Czerniak** 

**Page 2**  **of 3** 

**Monitored air**  **quality in** **the Cincinnati**  **area through**  **the year**  **2014 continues**  **to attain the 1997 annual**  **fine particle**  **standard. Air**  **quality improvements**  **in the**  **area are**  **due to**  **permanent and**  **enforceable measures**  **that have achieved**  **significant emission**  **reductions that** **will ensure**  **continued compliance**  **(maintenance) with**  **the standard**  **with**
**an increasing**  **margin of** **safety over**  **time. No**  **further control**  **measures are**  **necessary to**  **advance the**  **attainment date**  **as the**  **Cincinnati area**  **has attained**  **and continues**  **to attain**  **the 1997**  **annual fine**  **particle standard.**  **Indiana commits**  **to maintain**  **existing control**
**measures after**  **redesignation or**  **submit to**  **U.S. EPA,**  **as a**  **state implementation**  **plan (SIP)**  **revision, any**  **changes to**  **its rules**  **or emission**  **limits applicable**  **to PM2.5**  **and/or fine**  **particle precursor**  **emission sources,**  **as required**  **for maintenance**  **of the**  **1997 annual**  **fine particle**  **standard in**  **Lawrenceburg Township,** **Dearborn County, Indiana.** 

**Indiana met**  **its obligation** **to submit**  **an attainment**  **SIP to**  **U.S. EPA**  **for its**  **portion of**  **the nonattainment**  **area on**  **July 3,** **2008. This**  **attainment demonstration**  **showed that**  **existing permanent**  **and enforceable**  **controls would**  **provide for**  **timely attainment of** **the 1997**  **PM2.5 standard**  **by the**  **attainment deadline**  **of April**  **5, 2009.**  **IDEM's attainment**  **demonstration was**  **validated by**  **quality assured**  **monitoring data**  **at the**  **close of**  **2009. Indiana's**  **attainment demonstration**  **and weight**  **of evidence**  **analysis for**  **Lawrenceburg Township,** **Dearborn County,** **Indiana, clearly**  **demonstrated existing**  **permanent and**  **enforceable emission control measures will ensure**  **that the**  **area will continue**  **to maintain**  **compliance with the**  **1997 annual**  **fine particle**  **standard with an**  **increasing margin**  **of safety**  **over time.**  **As such,** **Indiana is**  **confident that**  **no other**  **reasonably available**  **measures were**  **available or**  **necessary to**  **attain or**  **advance attainment**  **of the**  **standard.**

**The primary**  **source for**  **PM2.5 precursor**  **emissions within**  **Indiana's portion**  **of the** 
**non attainment**  **area is**  **the Tanners**  **Creek power**  **plant. The**  **location of** **this power**  **plant, combined** **with the**  **volume of**  **precursor emissions**  **was the**  **primary rationale**  **for U.S.**  **EPA's inclusion**  **of Lawrenceburg** **Township within**  **the nonattainment**  **area. Within**  **Indiana's attainment**  **SIP, the**  **Clean Air**  **Interstate Rule**  **(CAIR) was**  **cited as** **the critical**  **permanent and**  **enforceable control**  **measure that** **would aid**  **in providing**  **for attainment**  **of the**  **area. The**  **implementation of** **this rule**  **demonstrated significant**  **emission reductions**  **to occur**  **at the**  **Tanners Creek**  **power plant.**  **It should**  **be noted,** **as the**  **result of** **a settlement** **with U.S.**  **EPA to**  **resolve violations**  **of the**  **CAA's new**  **source review**  **(NSR) requirements,**  **American Electric**  **Power (AEP)**  **permanently retired**  **its Tanners**  **Creek Generating**  **Station located**  **in Lawrenceburg**  **Township, Dearborn**  **County (i.e.**  **all four**  **coal-fired electric**  **generating units)**  **on June**  **1, 2015.**  **This will**  **ensure that** **the facility**  **does not**  **restart without proper**  **permitting under**  **the CAA.**  **As a**  **result of**  **the closure**  **of this**  **facility, direct**  **PM2**

**. 5**  **and fine**  **particle precursor** **emissions in**  **Dearborn County,**  **Indiana, have**  **decreased significantly**  **further improving**  **air quality**  **in the**  **Cincinnati-Hamilton, OH-KY-IN,**  **nonattainment area,**  **above and**  **beyond what**  **Indiana demonstrated**  **as necessary**  **to support**  **ongoing attainment**  **of the**  **area.**

**Based on** **the information**  **provided herein,** **Indiana respectively**  **requests U.S.**  **EPA act**  **on the**  **portion of**  **Indiana's attainment**  **plan for**  **Lawrenceburg Township**  **that addresses RACM/RACT,** **submitted on**  **July 3,**  **2008 to**  **U.S. EPA,** **which is**  **still before**  **U.S. EPA.**  **Indiana believes**  **that it**  **has satisfied**  **its obligation**  **under Section**  **172 (c)(1) of**  **the CAA.** **Mr. George**  **Czerniak**

**Page 3**  **of 3** 

**This submittal**  **consists of** **one (1)**  **hard copy**  **of this**  **letter. An**  **electronic version**  **of this**  **letter, in**  **PDF format,** **has been**  **sent to**  **Doug Aburano,**  **Chief of**  **U.S. EPA**  **Region 5's**  **Attainment Planning**  **and Maintenance**  **Section. If**  **you have**  **any questions**  **or need**  **additional information,** **please contact**  **Scott Deloney,**  **Chief, Air**  **Programs Branch,** **at (317)**  **233-5694 or**  **sdeloney@idem**

**. in.gov** 

**.**

**kb/sd/bc/gf/lf Sincerely,**  

# l(e;JL **o�r**

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

**cc: John**  **Summerhays, U.S.**  **EPA Region**  **5 Doug**  **Aburano, U.S.**  **EPA Region 5**  **John Mooney,** **U.S. EPA**  **Region 5**  **Keith Baugues,** **IDEM-OAQ Scott**  **Deloney, I** **DEM-OAQ Brian**  **Callahan, IDEM-OAQ**  **Gale Ferris,**  **IDEM-OAQ Leslie**  **Ferguson, IDEM-OAQ**  **File Copy**