Scenario SO2 NOx PM Pre-control days >0.5 Postcontrol days >0.5∆days Precontrol days >1.0Postcontrol days >1.0∆days PrecontrolNo control Existing LNB Existing ESP 100

--- --- 49

--- --- Run 1 FGD at 90% Presumptive Existing ESP 100 23 77 49 5 44 Run 2 FGD at 93% Presumptive Existing ESP 100 22 78 49 5 44 Run 3 FGD at 95% Presumptive Existing ESP 100 17 83 49 3 46 Run 4 FGD at 90% SOFA Existing ESP 100 22 78 49 5 44 Run 5 FGD at 93% SOFA Existing ESP 100 19 81 49 4 45 Run 6 FGD at 95% SOFA Existing ESP 100 12 88 49 3 46 SupplementalFGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA 3-year totals **Leland Olds Unit 1 - Days > 0.5 dv and >1.0 dv**
Control Option TRNP-South Unit 3-year totals

Page 1 of 4**Leland Olds 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 >1.0Postcontrol days >1.0∆days PrecontrolNo control Existing LNB Existing ESP 99

--- --- 55

--- --- Run 1 FGD at 90% Presumptive Existing ESP 99 28 71 55 7 48 Run 2 FGD at 93% Presumptive Existing ESP 99 23 76 55 7 48 Run 3 FGD at 95% Presumptive Existing ESP 99 18 81 55 4 51 Run 4 FGD at 90% SOFA Existing ESP 99 21 78 55 7 48 Run 5 FGD at 93% SOFA Existing ESP 99 18 81 55 4 51 Run 6 FGD at 95% SOFA Existing ESP 99 14 85 55 2 53 SupplementalFGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA 3-year totals 3-year totals Control Option TRNP-North Unit

Page 2 of 4**Leland Olds 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 >1.0Postcontrol days >1.0∆days PrecontrolNo control Existing LNB Existing ESP 71

--- --- 32

--- --- Run 1 FGD at 90% Presumptive Existing ESP 71 23 48 32 5 27 Run 2 FGD at 93% Presumptive Existing ESP 71 13 58 32 3 29 Run 3 FGD at 95% Presumptive Existing ESP 71 10 61 32 3 29 Run 4 FGD at 90% SOFA Existing ESP 71 14 57 32 3 29 Run 5 FGD at 93% SOFA Existing ESP 71 13 58 32 3 29 Run 6 FGD at 95% SOFA Existing ESP 71 8 63 32 2 30 SupplementalFGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA Control Option TRNP-Elkhorn Ranch 3-year totals 3-year totals

Page 3 of 4**Leland Olds 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 >1.0Postcontrol days >1.0∆days PrecontrolNo control Existing LNB Existing ESP 130

--- --- 76

--- --- Run 1 FGD at 90% Presumptive Existing ESP 130 24 106 76 8 68 Run 2 FGD at 93% Presumptive Existing ESP 130 22 108 76 6 70 Run 3 FGD at 95% Presumptive Existing ESP 130 15 115 76 3 73 Run 4 FGD at 90% SOFA Existing ESP 130 22 108 76 5 71 Run 5 FGD at 93% SOFA Existing ESP 130 15 115 76 3 73 Run 6 FGD at 95% SOFA Existing ESP 130 12 118 76 3 73 SupplementalFGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA Note: Units 1 and 2 were modeled together in the supplemental scenario. Individual unit impacts for the SOFA+SNCR control option were not supplied by NDDH. Control Option Lostwood NWA 3-year totals 3-year totals

Page 4 of 4Scenario SO2 NOx PM Precontrol days >0.5Postcontrol days >0.5∆days Precontrol days >1.0Postcontrol days >1.0∆days PrecontrolNo control No control Existing baghouse 142

--- --- 94

--- --- Run 1 FGD at 95% ASOFA Existing baghouse 142 53 89 94 21 73 Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 142 37 105 94 10 84 Run 3 FGD at 95% ASOFA+SNCR+RRIExisting baghouse 142 32 110 94 9 85 ND Run 1FGD at 95% ASOFA+SCR Existing baghouse 142 12 130 94 2 92 **Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv**

TRNP-South Unit
Control Option 3-year totals 3-year totals

Page 1 of 4**Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv**

Scenario SO2 NOx PM Precontrol days >0.5Postcontrol days >0.5∆days Precontrol days >1.0Postcontrol days >1.0∆days Precontrol No control No control Existing baghouse 144

--- --- 88

--- --- Run 1 FGD at 95% ASOFA Existing baghouse 144 52 92 88 25 63 Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 144 38 106 88 15 73 Run 3 FGD at 95% ASOFA+SNCR+RRIExisting baghouse 144 34 110 88 13 75 ND Run 1 FGD at 95% ASOFA+SCR Existing baghouse 144 7 137 88 1 87 TRNP-North Unit Control Option 3-year totals 3-year totals

Page 2 of 4**Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv**

Scenario SO2 NOx PM Precontrol days >0.5Postcontrol days >0.5∆days Precontrol days >1.0Postcontrol days >1.0∆days PrecontrolNo control No control Existing baghouse 117

--- --- 61

--- --- Run 1 FGD at 95% ASOFA Existing baghouse 117 28 89 61 11 50 Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 117 21 96 61 8 53 Run 3 FGD at 95% ASOFA+SNCR+RRIExisting baghouse 117 20 97 61 8 53 ND Run 1FGD at 95% ASOFA+SCR Existing baghouse 117 9 108 61 1 60 TRNP-Elkhorn Ranch Control Option 3-year totals 3-year totals

Page 3 of 4**Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv**

Scenario SO2 NOx PM Precontrol days >0.5Postcontrol days >0.5∆days Precontrol days >1.0Postcontrol days >1.0∆days Precontrol No control No control Existing baghouse 180

--- --- 112

--- --- Run 1 FGD at 95% ASOFA Existing baghouse 180 70 110 112 23 89 Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 180 49 131 112 11 101 Run 3 FGD at 95% ASOFA+SNCR+RRIExisting baghouse 180 42 138 112 9 103 ND Run 1 FGD at 95% ASOFA+SCR Existing baghouse 180 8 172 112 2 110 Lostwood NWA Control Option 3-year totals 3-year totals

Page 4 of 4