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