AERMOD SO2 Performance Study

Kali Frost IDEM

Region 5 Air Toxics Meeting October 23, 2013

Site Description

Gibson Generating Station Petersburg & Ratts Generating Stations

3,145 MW generating capacity Petersburg - 1,760 MW Ratts - 250 MW

Design Value (DV)

0

0.5

1

1.5

2

2.5

3

3.5

Gibson DV Ratios

v12060_OS

v12060_NWS

v12345

ADJU*

ADJU* & LW1

ADJU* & LW2

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Daviess Pike P/R-wide avg

Pete/Ratts DV Ratios

v12060_OS

v12060_NWS

v12345

ADJU*

ADJU* & LW1

ADJU* & LW2

• DV ratio - model design value/monitor design value • Ideal value of 1.0 • Acceptable range from 0.5-2.0

Robust Highest Concentration (RHC) Statistic

0

0.5

1

1.5

2

2.5

3

3.5

4

Gibson RHC Ratios

v12060_OS

v12060_NWS

v12345

ADJU*

ADJU* & LW1

ADJU* & LW2

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

Daviess Pike P/R-wide avg

Pete/Ratts RHC Ratios

v12060_OS

v12060_NWS

v12345

ADJU*

ADJU* & LW1

ADJU* & LW2

• RHC ratio - model RHC/monitor RHC • Ideal value of 1.0 • Acceptable range from 0.5-2.0

Gibson Q-Q Plots

Petersburg/Ratts Q-Q Plots