## IDEM INDIANA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT We ProtectHoosiers andOurEnvironment. MitchellE. DanielsJr. 100 North Senate Avenue Governor Indianapolis, Indiana 46204 (317) 232-8603 Thomas W. Easterly Toll Free (800) 451-6027 Commissioner www.ldem.lN.goY 

## t;i:G2N;:;D 

## DEC 09Z009

Mr. BharatMathur Acting Regional Administrator U.S. Environmental Protection Agency Region V 77 WestJackson Boulevard Chicago, IL 60604-3950

DearMr. Mathur: December 7, 2009

Re: Technical Addendum for the Request for Redesignation and Maintenance Plan underthe Annual Fine Particles Standard for the Southwestern Indiana Area

The Indiana Department ofEnvironmental Management (IDEM) has prepared this technical addendum to the Request for Redesignation and Maintenance Plan underthe Annual Fine Particles Standard for the Southwestern IndianaAreato demonstrate the future year impacts from Electric Generating Units (EGUs) in the Southwestern IndianaArea. The final Request for Redesignation andMaintenance Plan was submitted to U.S. EPA on April 3, 2008.

IDEM has conducted photochemical modeling in orderto determine the potential impacts from EGUs in Southwestern Indiana on fme particle concentrations. The modeling was conducted using the "Round 6" emiSsions and meteorological files, compiled by the Lake Michigan AirDirectors Consortium (LADCO) and previously submitted by IDEM to the U.S. EPA. The Comprehensive Air Quality Model (CAMx, version 5.01)

was used to determine future year concentrations with maximum EGU emissions assumed for those located in Southwestern Indiana. The basecase emissions and meteorological files were based on 2005 data. Table I below lists the seven EGUs, for which IDEM increased future yearemissions to maximum reported levels.



### Table 1 SouthwestIndiana Electric Generatin2 Units (EGUs) County FacBityName Dubois COWlty Jasper Municipal Electric Utility Gibson COWlty PSI Energy

- Gibson PikeCoWlty Hoosier**Ener~** - Ratts Station IPL Petersburp; Generatinp; Station Spencer COWlty Indiana Michigan Power

- Rockport Warrick COWlty SIGECO F.B. Culley**Generatin~** Station SIGECO Warrick Power Plant

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### Mr. Mathur Page 2 of4

The purpose ofthis modeling exercise was to detennine whethercontinued attainment ofthe annual standard for fme particles would bejeopardized in Southwestern Indiana ifthe EGUs located in the areawere to unexpectedly discontinue the operation ofexisting emission control equipment in the future. IDEM 6elieves that its future year emission assumptions are overly conservative due to pennanent and enforceable regulatory programs eitherbeing or likely to be in place, including the NOx SIP Call, the Acid Rain Program, and the Clean Air Interstate Rule/Replacement Rule.

The emissions data derive from actual emissions reported by the EGUs located in Dubois, Gibson, Pike, Spencerand WarrickCounties. Fine particlespecie emissions were adjusted in these five counties to the maximum annual emissions reported to IDEM from 2000 to 2007 for the EGUs listed in Table 1. Ratios were detennined using the maximum emissions compared to 2005 emissions in orderto model the increaseto assess the EGUs attheirmaximum operation overthe past eight years. These ratios, shown in Table 2, were then appliedto the future year modeling files to detennine the increase in emissions for the EGUs located in Southwestern Indiana.

Table 2 Emission Ratios for Southwest Indiana EGUs (Tons per Year Increase) PMl.5 Species Dubois Co. Gibson Co. Pike Co. Spencer Co. Warrick Co. NO 2.74 3.37 1.97 1.88 9.46 N02 2.74 3.37 1.97 1.88 9.46 S02 2.72 1.44 3.82 1.29 5.76 PN03 2.74 3.37 1.97 1.88 9.46 PS04 2.72 1.44 3.82 1.29 5.74 FPRM 6.37 9.38 8.85 14.52 21.46 CPRM 5.61 6.88 12.04 11.18 36.41 CCRS 5.61 6.88 12.04 11.18 36.41 FCRS 6.37 9.38 8.85 14.52 21.46

The new modeling results were then compared to the basecase modeled results from Round 6 to detennine impacts from the increase in EGU emissions in Southwest Indiana. The"se results are shown in Tables 3 through 5 and show annual fine particle concentrations in Southwest Indiana increasedjust slightly from 0.1 J!glm3 to 0.2 J!g/m3 in 2009 and from 0.1 J!g/m3 to 0.3 J!g/m3 in 2012 and 2018. The largest increase in concentrations as a result ofthe adjusted EGU emissions occurred in Dubois and Spencer Counties. These areas would be considered downwind ofthe majority ofEGUs in the Southwest Indiana region. Monitors outside the Southwestern Indiana region showed modeled impacts at 0.1 J!g/m3 or less.



### 2009 I d· Table 

### 3 IPM M d 

## r R I fi So h 

### R d6N CAIRA

oun on- nnua 2.5 0 e 102 esuts or ut western n lanaDesign 

### 2009 Impact Value 

### 2009 Basecase from MonitorID Monitor Name County 

### 2003-2007 Basecase SW IN EGU SWIN increase EGU increase

, (llwmJ) (llwmJ ) (llg/mJ ) (llg/mJ) 18-163-0006 Civic Center Vanderburgh 14.7 14.5 14.6 0.1 18-163-0012 W. Mill Rd.**Vanderbur~"** 14.8 '14.7 14.8 0.1 18-163-0016 Univ.ofEvansville Vanderburgh 15.0 14.8 14.9 0.1 18-147-0009 Dale Spencer 14.3 14.1 14.3 0.2 18-037-2001 Jasper Post Office Dubois 15.2 14.9 15.1 0.2 18-083-0004 SW Purdue Ag. Knox 14.0 13.8 13.9 0.1

### Mr. Mathur 

### Page 3 of4

2012 

### Table 4 IPM Mod Ii R I fi 

### S th tId' R d6N CAIRA 

# . oun on- nnua 2.5 

### e ne: esuts or ou wes ern Ii 

### lana-

1 ., 

### -. 'Design , 2012 

### Impact'

,- , 

# . Value 2012 

### Basecase frbm' ' '.' 

### MonitorID MonitorName County

.2003-2007 

### Basecase ·SWIN SW'IN



## - EGU EGU increase increase (J,lg/m3) (J,lg/m3) (J,lg/m3) (J,lg/m3) 18-163-0006 Civic Center Vanderburgh 14.7 14.4 14.5 0.1 18-163-0012 W. Mill Rd. V**anderbur~h** 14.8 14.5 14.7 0.2 18-163-0016 Univ.ofEvansville Vanderburgh 15.0 14.7 14.8 0.1 18-147-0009 Dale Spencer 14.3 14.0 14.2 0.2 18-037-2001 JasperPost Office Dubois 15.2 14.8 15.0 0.2 18-083-0004 SW Purdue Ag. Knox 14.0 13.7 13.8 0.1

2018 

### TableS IPM M d 

## r R Its fi 

### S th tId' R d6N CAIRA

oun on- nnua 2.5 

### o eID2 esu or ou wes ern n lanaDesign 2018 

### Impact Value 2018 

### Basecase from MonitorID MonitorName County 2003-2007 

### Basecase SWIN SWIN 

### EGU EGU increase increase (J,lg/m3) (J,lg/m3.) (Jtg/m3)**(J,lg/m~)** 18-163-0006 Civic Center Vanderburgh

- 14.7 14.3 l4.4 ,0.1- 18-163-0012 W. Mill Rd.**Vanderbur~** 14.8 14.4 14.5 0.,1 18-163-0016 Univ.ofEvansville Vanderburgh 15.0 14.6 14.7 0.1 18-147-0009 Dale Spencer 14.3 13.9 14.1 0.2 18-037-2001 JasperPost Office Dubois 15.2 14.6 14.9 0.3 18-083-0004 SW Purdue Ag. Knox 14.0 13.5 13.7 0.2

The future year modeling indicates that ifall EGUs in Southwest Indiana operated attheir maximum emissions as recorded overthe pasteight years, all monitors in the Southwestern IndianaNonattainment Area would remain below the annual fine particle National Ambient Air Quality Standard of 15.0 J.lglm3

• IDEM deems the results ofthis modeling exercise to be conservative. For example, the monitored design value for annual fine particle concentrations within the Southwestern IndianaNonattainment Area atthe close of2008 (2006-2008) was 13.7 J.lglm3

, and the most current design value through the third quarter of2009 (2007-Qtr.3 2009) is 13.3 J.lglm3

• The highest future year modeled concentration with maximum EGU emissions factored 

### in

was for 2009 at 15.1 J.lglm3

, which reflects a margin ofsafety between 1.4 and 1.8 J.lglm3

•

IDEM believes thatthis technical addendum in conjunction with the previously submitted Redesignation Request and Maintenance Plan satisfies Indiana's obligation under Section 172(c) ofthe Clean Air Actto demonstrate how the area attained, and will continue to attain the annualNAAQS for f!ne particles. Quality assured ambient airquality monitoring datafor fine particles through third**qu~er** of2009**dem~ristrates** that the Southwestern Indiana area has attainedthe annual NAAQS for fme particle.s for.a**fo~Ji con~utive**  year and. is ellgibie for**redesign~tion.** The**resul~s** ofthe, future**y~ar** modeling,exercise summarized above illustrates thatthe Southwestern Indiana Area will continue to attain the annual standard for fine:particies well into the future withoutrelying on emission reductions from the Clean Air Interstate Rule. Furthermore, IDEM has demonstratedthat in the unlikely instance thatthe EGUs within the Southwestern Indiana Area do not operate existing emission controls in the future, the area would still comply with the annual standard for fine particles.

### Mr. Mathur 

### Page 4 of4

IDEM requests that U.S. EPA proceedwith final review and approval ofthe Request for Redesignation and Maintenance Plan underthe Annual Fine Particles Standard for the Southwestern Indiana Area. Ifyou have any questions or need additional information, please feel free to contact ScottDeloney ofIDEM's Office ofAir Quality at (317) 233-5694 or sdeloney@idem.in.gov

.



# .**homas~~ery** Commissioner

DM/sd/skr

cc: John Summerhays, U.S. EPA Region 5 Matt Rau, U.S. EPA Region 5 John Mooney, U.S. EPA Region 5 Cheryl Newton, U.S. EPA Region 5 Scott Deloney, IDEM Christine Pedersen, IDEM Sarah Raymond, IDEM