Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing 

SOFA/LNB Existing ESP 83 --- --- 45 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 83 37 46 45 10 35

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 83 34 49 45 10 35

3 Scrubber Modifications SNCR Existing ESP 83 33 50 45 10 35

4 Scrubber Modifications SCR Existing ESP 83 21 62 45 5 40

5 Scrubber Modifications LTO Existing ESP 83 19 64 45 3 42

6 New Scrubber SOFA/LNB #2 Existing ESP 83 20 63 45 5 40

7 New Scrubber SOFA/LNB #1 Existing ESP 83 15 68 45 3 42

8 New Scrubber SNCR Existing ESP 83 14 69 45 1 44

9 New Scrubber SCR Existing ESP 83 7 76 45 0 45

10 New Scrubber LTO Existing ESP 83 4 79 45 0 45

Coal Creek Unit 1 - Days > 0.5 dv and >1.0 dv

TRNP-South Unit

Control Option 3-year totals 3-year totals

Page 1 of 4
Coal Creek Unit 1 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing 

SOFA/LNB Existing ESP 78 --- --- 38 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 78 31 47 38 10 28

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 78 29 49 38 9 29

3 Scrubber Modifications SNCR Existing ESP 78 26 52 38 8 30

4 Scrubber Modifications SCR Existing ESP 78 22 56 38 4 34

5 Scrubber Modifications LTO Existing ESP 78 17 61 38 3 35

6 New Scrubber SOFA/LNB #2 Existing ESP 78 19 59 38 4 34

7 New Scrubber SOFA/LNB #1 Existing ESP 78 16 62 38 2 36

8 New Scrubber SNCR Existing ESP 78 14 64 38 1 37

9 New Scrubber SCR Existing ESP 78 5 73 38 1 37

10 New Scrubber LTO Existing ESP 78 3 75 38 0 38

TRNP-North Unit

Control Option 3-year totals 3-year totals

Page 2 of 4
Coal Creek Unit 1 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing 

SOFA/LNB Existing ESP 57 --- --- 26 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 57 22 35 26 8 18

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 57 20 37 26 7 19

3 Scrubber Modifications SNCR Existing ESP 57 17 40 26 6 20

4 Scrubber Modifications SCR Existing ESP 57 12 45 26 2 24

5 Scrubber Modifications LTO Existing ESP 57 10 47 26 1 25

6 New Scrubber SOFA/LNB #2 Existing ESP 57 12 45 26 3 23

7 New Scrubber SOFA/LNB #1 Existing ESP 57 10 47 26 3 23

8 New Scrubber SNCR Existing ESP 57 8 49 26 1 25

9 New Scrubber SCR Existing ESP 57 5 52 26 0 26

10 New Scrubber LTO Existing ESP 57 2 55 26 0 26

TRNP-Elkhorn Ranch

Control Option 3-year totals 3-year totals

Page 3 of 4
Coal Creek Unit 1 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing 

SOFA/LNB Existing ESP 109 --- --- 56 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 109 41 68 56 11 45

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 109 38 71 56 11 45

3 Scrubber Modifications SNCR Existing ESP 109 32 77 56 11 45

4 Scrubber Modifications SCR Existing ESP 109 27 82 56 8 48

5 Scrubber Modifications LTO Existing ESP 109 24 85 56 8 48

6 New Scrubber SOFA/LNB #2 Existing ESP 109 24 85 56 8 48

7 New Scrubber SOFA/LNB #1 Existing ESP 109 19 90 56 7 49

8 New Scrubber SNCR Existing ESP 109 10 99 56 4 52

9 New Scrubber SCR Existing ESP 109 7 102 56 1 55

10 New Scrubber LTO Existing ESP 109 5 104 56 0 56

Lostwood NWA

Control Option 3-year totals 3-year totals

Page 4 of 4
Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing 

SOFA/LNB Existing ESP 83 --- --- 45 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 83 37 46 45 10 35

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 83 34 49 45 10 35

3 Scrubber Modifications SNCR Existing ESP 83 33 50 45 10 35

4 Scrubber Modifications SCR Existing ESP 83 21 62 45 5 40

5 Scrubber Modifications LTO Existing ESP 83 19 64 45 3 42

6 New Scrubber SOFA/LNB #2 Existing ESP 83 20 63 45 5 40

7 New Scrubber SOFA/LNB #1 Existing ESP 83 15 68 45 3 42

8 New Scrubber SNCR Existing ESP 83 14 69 45 1 44

9 New Scrubber SCR Existing ESP 83 7 76 45 0 45

10 New Scrubber LTO Existing ESP 83 4 79 45 0 45

TRNP-South Unit

Coal Creek Unit 2 - Days > 0.5 dv and >1.0 dv

Control Option 3-year totals 3-year totals

Page 1 of 4
Coal Creek Unit 2 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing 

SOFA/LNB Existing ESP 78 --- --- 38 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 78 31 47 38 10 28

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 78 29 49 38 9 29

3 Scrubber Modifications SNCR Existing ESP 78 26 52 38 8 30

4 Scrubber Modifications SCR Existing ESP 78 22 56 38 4 34

5 Scrubber Modifications LTO Existing ESP 78 17 61 38 3 35

6 New Scrubber SOFA/LNB #2 Existing ESP 78 19 59 38 4 34

7 New Scrubber SOFA/LNB #1 Existing ESP 78 16 62 38 2 36

8 New Scrubber SNCR Existing ESP 78 14 64 38 1 37

9 New Scrubber SCR Existing ESP 78 5 73 38 1 37

10 New Scrubber LTO Existing ESP 78 3 75 38 0 38

Control Option 3-year totals 3-year totals

TRNP-North Unit

Page 2 of 4
Coal Creek Unit 2 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing 

SOFA/LNB Existing ESP 57 --- --- 26 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 57 22 35 26 8 18

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 57 20 37 26 7 19

3 Scrubber Modifications SNCR Existing ESP 57 17 40 26 6 20

4 Scrubber Modifications SCR Existing ESP 57 12 45 26 2 24

5 Scrubber Modifications LTO Existing ESP 57 10 47 26 1 25

6 New Scrubber SOFA/LNB #2 Existing ESP 57 12 45 26 3 23

7 New Scrubber SOFA/LNB #1 Existing ESP 57 10 47 26 3 23

8 New Scrubber SNCR Existing ESP 57 8 49 26 1 25

9 New Scrubber SCR Existing ESP 57 5 52 26 0 26

10 New Scrubber LTO Existing ESP 57 2 55 26 0 26

3-year totals 3-year totals

TRNP-Elkhorn Ranch

Control Option

Page 3 of 4
Coal Creek Unit 2 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol Existing Wet Scrubber Existing Existing ESP 109 --- --- 56 --- ---

1 Scrubber Modifications SOFA/LNB #2 Existing ESP 109 41 68 56 11 45

2 Scrubber Modifications SOFA/LNB #1 Existing ESP 109 38 71 56 11 45

3 Scrubber Modifications SNCR Existing ESP 109 32 77 56 11 45

4 Scrubber Modifications SCR Existing ESP 109 27 82 56 8 48

5 Scrubber Modifications LTO Existing ESP 109 24 85 56 8 48

6 New Scrubber SOFA/LNB #2 Existing ESP 109 24 85 56 8 48

7 New Scrubber SOFA/LNB #1 Existing ESP 109 19 90 56 7 49

8 New Scrubber SNCR Existing ESP 109 10 99 56 4 52

9 New Scrubber SCR Existing ESP 109 7 102 56 1 55

10 New Scrubber LTO Existing ESP 109 5 104 56 0 56

Control Option 3-year totals 3-year totals

Lostwood NWA

Page 4 of 4