Document ID: EPA-R08-OAR-2012-0026-0037
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2012-07-10T04:00Z

Summary of EPA's Additional Visibility Improvement Modeling 
      EPA performed additional modeling of NOx control scenarios for both BART and reasonable progress sources. All Region 8 modeling files are available upon request. Contact Laurel Dygowski at dygowski.laurel@epa.gov. For baseline emissions, the BART Guidelines recommend that states use the maximum 24-hour average actual emission rate for the meteorological period being modeled.  The visibility modeling performed by PacifiCorp, and subsequently submitted by the state, deviates from this guidance by using the permit limit emission rates and maximum rated heat input to derive the modeled emission rates instead of the actual maximum 24-hour average. The visibility modeling performed by Basin Electric, and subsequently submitted by the state, also deviates from this guidance by using a baseline hourly emission rates derived from actual annual average heat input (MMBtu) and actual annual average emission rates (lb/MMBtu) from 2001-2003 continuous emissions monitoring (CEM) data.   For consistency, EPA's additional modeling to ascertain visibility improvements from individual NOx controls used the state's baseline emission rates for the Pacificorp sites and Basin Electric's Laramie River Station. All other aspects of EPA's additional visibility modeling followed the recommendations made in the BART Guidelines.
           The tables beginning on page 4 show the CALPUFF inputs used for each unit modeled. EPA's modeling modified the state of Wyoming's inputs in order to isolate the impact of different NOx control scenarios.  As seen in the tables, the NOx emission rates were varied across the different scenarios with the other input parameters held constant.  For the Pacificorp and Basin Electric BART sources, the inputs were derived from the state of Wyoming's BART Application Analyses that can be downloaded from the following website: http://deq.state.wy.us/aqd/309(g)%20Attachment%20A_January%202011%20Submittal.asp
EPA's modeling utilized the emission and stack parameter CALPUFF inputs from "Post-Control Scenario A" in the reports for its Scenarios 1-3 with the only difference between scenarios being the emission rate for NOx and, in the SCR scenarios, total sulfate rates were increased to account for the additional production that results from SCR controls.  EPA's "New Baseline" is essentially the state's "Post-Control Scenario A" but with the NOx emission rate from their "Baseline" scenario.  Table 1 summarizes the control scenarios from EPA's additional modeling for BART sources.
Table 1- Description of EPA control scenarios for Wyoming's BART sources
                                 EPA Scenario
                                  Description
New Baseline
Post-Control Scenario A from state`s BART Application Analysis with NOx emission rate from state's "Baseline" scenario
Scenario 1
Post-Control Scenario A from state's BART Application Analysis with NOx emission rate that reflects the visibility improvement from LNB/OFA controls.
Scenario 2
Post-Control Scenario A from state's BART Application Analysis with NOx emission rate that reflects the visibility improvement from SNCR controls
Scenario 3
Post-Control Scenario A from state's BART Application Analysis with NOx emission rate that reflects the visibility improvement from SCR controls

EPA also performed additional modeling for Dave Johnston's Units 1 and 2.  These are considered reasonable progress sources and were not part of the state's BART Application Analyses.  EPA followed a similar approach for modeling these sources as used for the BART sources.  Permit limit emission rates with heat input were used to derive emission inputs in the "New Baseline" scenario.  Similar to the BART sources, the only differences in the control scenarios are the emission rates for NOx and, in the SCR scenario (Scenario 3), total sulfate rates were increased to account for the additional production that results from SCR controls. Stack parameter data for these sources was obtained from the Western Region Air Partnership's (WRAP) 2002 SMOKE input files.  Table 2 summarizes the control scenarios for EPA's reasonable progress source modeling.

Table 2  -  Description of EPA control scenarios for Reasonable Progress sources (Dave Johnston Units 1 and 2)
                                 EPA Scenario
                                  Description
New Baseline
Inputs obtained from facility's Title V Operating Permit limits
Scenario 0
Same inputs as New Baseline with a NOx emission rate that reflect visibility improvements from LNB controls
Scenario 1
Same inputs as New Baseline with a NOx emission rate that reflect visibility improvements from LNB/OFA controls
Scenario 2
Same inputs as New Baseline with a NOx emission rate that reflect visibility improvements from SNCR controls
Scenario 3
Same inputs as New Baseline with a NOx emission rate that reflect visibility improvements from SCR controls

Pacificorp - Dave Johnston Unit 3

New Baseline
Scenario 1
Scenario 2
Scenario 3
                        Hourly Heat Input (mmBtu/hour)

                                                                           2800
                                                                           2800
                                                                           2800
                                                                           2800
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.15
                                                                           0.15
                                                                           0.15
                                                                           0.15

Nox (lb/MMBtu)
                                                                            0.7
                                                                           0.28
                                                                           0.19
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            420
                                                                            420
                                                                            420
                                                                            420

Total Sulfate (SO4)(lb/hr)
                                                                            2.5
                                                                            2.5
                                                                            2.5
                                                                            5.1

Nox (lb/hr)
                                                                           1960
                                                                            784
                                                                            532
                                                                            196

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           23.9
                                                                           23.9
                                                                           23.9
                                                                           23.9

PM2.5 (lb/hr)
                                                                           18.1
                                                                           18.1
                                                                           18.1
                                                                           18.1

Stack Height (meters)
                                                                          152.4
                                                                          152.4
                                                                          152.4
                                                                          152.4

Base Elevation (meters)
                                                                           1509
                                                                           1509
                                                                           1509
                                                                           1509

Stack Diameter (meters)
                                                                           4.57
                                                                           4.57
                                                                           4.57
                                                                           4.57

Exit Velocity (meters/second)
                                                                           25.5
                                                                           25.5
                                                                           25.5
                                                                           25.5

Exit Temperature (Kelvin)
                                                                            348
                                                                            348
                                                                            348
                                                                            348

Pacificorp - Dave Johnston Unit 4

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           4100
                                                                           4100
                                                                           4100
                                                                           4100
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.15
                                                                           0.15
                                                                           0.15
                                                                           0.15

Nox (lb/MMBtu)
                                                                            0.4
                                                                           0.15
                                                                           0.12
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            615
                                                                            615
                                                                            615
                                                                            615

Total Sulfate (SO4)(lb/hr)
                                                                            3.7
                                                                            3.7
                                                                            3.7
                                                                            7.4

Nox (lb/hr)
                                                                           1640
                                                                            615
                                                                            492
                                                                            287

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           35.1
                                                                           35.1
                                                                           35.1
                                                                           35.1

PM2.5 (lb/hr)
                                                                           26.4
                                                                           26.4
                                                                           26.4
                                                                           26.4

Stack Height (meters)
                                                                            152
                                                                            152
                                                                            152
                                                                            152

Base Elevation (meters)
                                                                           1509
                                                                           1509
                                                                           1509
                                                                           1509

Stack Diameter (meters)
                                                                           5.79
                                                                           5.79
                                                                           5.79
                                                                           5.79

Exit Velocity (meters/second)
                                                                           25.7
                                                                           25.7
                                                                           25.7
                                                                           25.7

Exit Temperature (Kelvin)
                                                                            350
                                                                            350
                                                                            350
                                                                            350

Pacificorp - Jim Bridger Unit 1

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           6000
                                                                           6000
                                                                           6000
                                                                           6000
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.15
                                                                           0.15
                                                                           0.15
                                                                           0.15

Nox (lb/MMBtu)
                                                                           0.45
                                                                           0.26
                                                                            0.2
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            900
                                                                            900
                                                                            900
                                                                            900

Total Sulfate (SO4)(lb/hr)
                                                                           54.1
                                                                           54.1
                                                                           54.1
                                                                          108.1

Nox (lb/hr)
                                                                           2700
                                                                           1560
                                                                           1200
                                                                            420

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           77.4
                                                                           77.4
                                                                           77.4
                                                                           77.4

PM2.5 (lb/hr)
                                                                          102.6
                                                                          102.6
                                                                          102.6
                                                                          102.6

Stack Height (meters)
                                                                            152
                                                                            152
                                                                            152
                                                                            152

Base Elevation (meters)
                                                                           2036
                                                                           2036
                                                                           2036
                                                                           2036

Stack Diameter (meters)
                                                                           7.32
                                                                           7.32
                                                                           7.32
                                                                           7.32

Exit Velocity (meters/second)
                                                                           24.7
                                                                           24.7
                                                                           24.7
                                                                           24.7

Exit Temperature (Kelvin)
                                                                            328
                                                                            328
                                                                            328
                                                                            328

Pacificorp - Jim Bridger Unit 2

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           6000
                                                                           6000
                                                                           6000
                                                                           6000
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.15
                                                                           0.15
                                                                           0.15
                                                                           0.15

Nox (lb/MMBtu)
                                                                           0.24
                                                                           0.26
                                                                            0.2
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            900
                                                                            900
                                                                            900
                                                                            900

Total Sulfate (SO4)(lb/hr)
                                                                           54.1
                                                                           54.1
                                                                           54.1
                                                                          108.1

Nox (lb/hr)
                                                                           1440
                                                                           1560
                                                                           1200
                                                                            420

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           77.4
                                                                           77.4
                                                                           77.4
                                                                           77.4

PM2.5 (lb/hr)
                                                                          102.6
                                                                          102.6
                                                                          102.6
                                                                          102.6

Stack Height (meters)
                                                                            152
                                                                            152
                                                                            152
                                                                            152

Base Elevation (meters)
                                                                           2036
                                                                           2036
                                                                           2036
                                                                           2036

Stack Diameter (meters)
                                                                           7.32
                                                                           7.32
                                                                           7.32
                                                                           7.32

Exit Velocity (meters/second)
                                                                           24.7
                                                                           24.7
                                                                           24.7
                                                                           24.7

Exit Temperature (Kelvin)
                                                                            328
                                                                            328
                                                                            328
                                                                            328

Pacificorp - Jim Bridger Unit 4

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           6000
                                                                           6000
                                                                           6000
                                                                           6000
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.15
                                                                           0.15
                                                                           0.15
                                                                           0.15

Nox (lb/MMBtu)
                                                                           0.45
                                                                           0.26
                                                                            0.2
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            900
                                                                            900
                                                                            900
                                                                            900

Total Sulfate (SO4)(lb/hr)
                                                                           54.1
                                                                           54.1
                                                                           54.1
                                                                          108.1

Nox (lb/hr)
                                                                           2700
                                                                           1560
                                                                           1200
                                                                            420

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           77.4
                                                                           77.4
                                                                           77.4
                                                                           77.4

PM2.5 (lb/hr)
                                                                          102.6
                                                                          102.6
                                                                          102.6
                                                                          102.6

Stack Height (meters)
                                                                            152
                                                                            152
                                                                            152
                                                                            152

Base Elevation (meters)
                                                                           2033
                                                                           2033
                                                                           2033
                                                                           2033

Stack Diameter (meters)
                                                                           9.45
                                                                           9.45
                                                                           9.45
                                                                           9.45

Exit Velocity (meters/second)
                                                                           12.9
                                                                           12.9
                                                                           12.9
                                                                           12.9

Exit Temperature (Kelvin)
                                                                            322
                                                                            322
                                                                            322
                                                                            322

Pacificorp - Naughton Unit 1

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           1850
                                                                           1850
                                                                           1850
                                                                           1850
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.15
                                                                           0.15
                                                                           0.15
                                                                           0.15

Nox (lb/MMBtu)
                                                                           0.58
                                                                           0.26
                                                                           0.21
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            278
                                                                            278
                                                                            278
                                                                            278

Total Sulfate (SO4)(lb/hr)
                                                                           16.7
                                                                           16.7
                                                                           16.7
                                                                           33.3

Nox (lb/hr)
                                                                           1073
                                                                            481
                                                                            389
                                                                            130

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           33.4
                                                                           33.4
                                                                           33.4
                                                                           33.4

PM2.5 (lb/hr)
                                                                           44.3
                                                                           44.3
                                                                           44.3
                                                                           44.3

Stack Height (meters)
                                                                            145
                                                                            145
                                                                            145
                                                                            145

Base Elevation (meters)
                                                                           2115
                                                                           2115
                                                                           2115
                                                                           2115

Stack Diameter (meters)
                                                                           4.88
                                                                           4.88
                                                                           4.88
                                                                           4.88

Exit Velocity (meters/second)
                                                                           18.1
                                                                           18.1
                                                                           18.1
                                                                           18.1

Exit Temperature (Kelvin)
                                                                            323
                                                                            323
                                                                            323
                                                                            323

Pacificorp - Naughton Unit 2

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           2400
                                                                           2400
                                                                           2400
                                                                           2400
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.15
                                                                           0.15
                                                                           0.15
                                                                           0.15

Nox (lb/MMBtu)
                                                                           0.54
                                                                           0.26
                                                                           0.21
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            360
                                                                            360
                                                                            360
                                                                            360

Total Sulfate (SO4)(lb/hr)
                                                                           21.6
                                                                           21.6
                                                                           21.6
                                                                           43.2

Nox (lb/hr)
                                                                           1296
                                                                            624
                                                                            504
                                                                            168

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           55.7
                                                                           55.7
                                                                           55.7
                                                                           55.7

PM2.5 (lb/hr)
                                                                           73.9
                                                                           73.9
                                                                           73.9
                                                                           73.9

Stack Height (meters)
                                                                            145
                                                                            145
                                                                            145
                                                                            145

Base Elevation (meters)
                                                                           2115
                                                                           2115
                                                                           2115
                                                                           2115

Stack Diameter (meters)
                                                                           5.49
                                                                           5.49
                                                                           5.49
                                                                           5.49

Exit Velocity (meters/second)
                                                                           18.5
                                                                           18.5
                                                                           18.5
                                                                           18.5

Exit Temperature (Kelvin)
                                                                            323
                                                                            323
                                                                            323
                                                                            323

Pacificorp - Naughton Unit 3

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           3700
                                                                           3700
                                                                           3700
                                                                           3700
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.22
                                                                           0.22
                                                                           0.22
                                                                           0.22

Nox (lb/MMBtu)
                                                                           0.45
                                                                           0.37
                                                                            0.3
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            814
                                                                            814
                                                                            814
                                                                            814

Total Sulfate (SO4)(lb/hr)
                                                                           33.3
                                                                           33.3
                                                                           33.3
                                                                           66.6

Nox (lb/hr)
                                                                           1665
                                                                           1369
                                                                           1110
                                                                            259

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           23.9
                                                                           23.9
                                                                           23.9
                                                                           23.9

PM2.5 (lb/hr)
                                                                           31.6
                                                                           31.6
                                                                           31.6
                                                                           31.6

Stack Height (meters)
                                                                            145
                                                                            145
                                                                            145
                                                                            145

Base Elevation (meters)
                                                                           2113
                                                                           2113
                                                                           2113
                                                                           2113

Stack Diameter (meters)
                                                                           8.08
                                                                           8.08
                                                                           8.08
                                                                           8.08

Exit Velocity (meters/second)
                                                                           20.2
                                                                           20.2
                                                                           20.2
                                                                           20.2

Exit Temperature (Kelvin)
                                                                            322
                                                                            322
                                                                            322
                                                                            322

Pacificorp  -  Wyodak
Note: CALPUFF inputs for Pacificorp's Wyodak facility were inadvertently left out of the original "CALPUFF Modeling Summary" file.  

New Baseline
Scenario 1
Scenario 2
Scenario 3
                        Hourly Heat Input (mmBtu/hour)

                                                                           4700
                                                                           4700
                                                                           4700
                                                                           4700
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.16
                                                                           0.16
                                                                           0.16
                                                                           0.16

Nox (lb/MMBtu)
                                                                           0.31
                                                                           0.23
                                                                           0.18
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                            759
                                                                            759
                                                                            759
                                                                            759

Total Sulfate (SO4)(lb/hr)
                                                                            5.5
                                                                            5.5
                                                                            5.5
                                                                           11.6

Nox (lb/hr)
                                                                           1457
                                                                           1081
                                                                            846
                                                                            329

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                           70.5
                                                                           70.5
                                                                           70.5
                                                                           70.5

PM2.5 (lb/hr)
                                                                           40.2
                                                                           40.2
                                                                           40.2
                                                                           40.2

Stack Height (meters)
                                                                            122
                                                                            122
                                                                            122
                                                                            122

Base Elevation (meters)
                                                                           1347
                                                                           1347
                                                                           1347
                                                                           1347

Stack Diameter (meters)
                                                                            6.1
                                                                            6.1
                                                                            6.1
                                                                            6.1

Exit Velocity (meters/second)
                                                                           23.5
                                                                           23.5
                                                                           23.5
                                                                           23.5

Exit Temperature (Kelvin)
                                                                            350
                                                                            350
                                                                            350
                                                                            350

Basin Electric  -  Laramie River Station Unit 1

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/year)

                                                                       46814433
                                                                       46814433
                                                                       46814433
                                                                       46814433
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.16
                                                                           0.16
                                                                           0.16
                                                                           0.16

Nox (lb/MMBtu)
                                                                           0.27
                                                                           0.23
                                                                           0.12
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (tpy)
                                                                           3745
                                                                           3745
                                                                           3745
                                                                           3745

Total Sulfate (SO4)(tpy)
                                                                           3.06
                                                                           3.18
                                                                           3.18
                                                                           3.18

Nox (tpy)
                                                                           6320
                                                                           5384
                                                                           2809
                                                                           1639

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(tpy)
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM2.5 (tpy)
                                                                            702
                                                                            702
                                                                            702
                                                                            702

Stack Height (meters)
                                                                        184.404
                                                                        184.404
                                                                        184.404
                                                                        184.404

Base Elevation (meters)
                                                                           1348
                                                                           1348
                                                                           1348
                                                                           1348

Stack Diameter (meters)
                                                                         8.6868
                                                                         8.6868
                                                                         8.6868
                                                                         8.6868

Exit Velocity (meters/second)
                                                                         21.336
                                                                         21.336
                                                                         21.336
                                                                         21.336

Exit Temperature (Kelvin)
                                                                       338.7056
                                                                       338.7056
                                                                       338.7056
                                                                       338.7056

Basin Electric  -  Laramie River Station Unit 2

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/year)

                                                                       46557738
                                                                       46557738
                                                                       46557738
                                                                       46557738
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.16
                                                                           0.16
                                                                           0.16
                                                                           0.16

Nox (lb/MMBtu)
                                                                           0.27
                                                                           0.23
                                                                           0.12
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (tpy)
                                                                           3725
                                                                           3725
                                                                           3725
                                                                           3725

Total Sulfate (SO4)(tpy)
                                                                            2.8
                                                                           3.25
                                                                           3.25
                                                                           3.25

Nox (tpy)
                                                                           6285
                                                                           5354
                                                                           2793
                                                                           1630

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(tpy)
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM2.5 (tpy)
                                                                            698
                                                                            698
                                                                            698
                                                                            698

Stack Height (meters)
                                                                        184.404
                                                                        184.404
                                                                        184.404
                                                                        184.404

Base Elevation (meters)
                                                                           1348
                                                                           1348
                                                                           1348
                                                                           1348

Stack Diameter (meters)
                                                                         8.6868
                                                                         8.6868
                                                                         8.6868
                                                                         8.6868

Exit Velocity (meters/second)
                                                                          21.03
                                                                          21.03
                                                                          21.03
                                                                          21.03

Exit Temperature (Kelvin)
                                                                       338.7056
                                                                       338.7056
                                                                       338.7056
                                                                       338.7056

Basin Electric  -  Laramie River Station Unit 3

New Baseline
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/year)

                                                                       47765529
                                                                       47765529
                                                                       47765529
                                                                       47765529
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                           0.17
                                                                           0.17
                                                                           0.17
                                                                           0.17

Nox (lb/MMBtu)
                                                                           0.27
                                                                           0.23
                                                                           0.12
                                                                           0.07
                                   Calpuff 
                                    Inputs
SO2 (tpy)
                                                                           4060
                                                                           4060
                                                                           4060
                                                                           4060

Total Sulfate (SO4)(tpy)
                                                                           0.22
                                                                           0.22
                                                                           0.22
                                                                           0.22

Nox (tpy)
                                                                           6448
                                                                           5493
                                                                           2866
                                                                           1672

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(tpy)
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM2.5 (tpy)
                                                                            716
                                                                            716
                                                                            716
                                                                            716

Stack Height (meters)
                                                                        184.404
                                                                        184.404
                                                                        184.404
                                                                        184.404

Base Elevation (meters)
                                                                           1348
                                                                           1348
                                                                           1348
                                                                           1348

Stack Diameter (meters)
                                                                         8.6868
                                                                         8.6868
                                                                         8.6868
                                                                         8.6868

Exit Velocity (meters/second)
                                                                          22.25
                                                                          22.25
                                                                          22.25
                                                                          22.25

Exit Temperature (Kelvin)
                                                                          352.0
                                                                          352.0
                                                                          352.0
                                                                          352.0

Reasonable Progress Sources 
Dave Johnston Unit 1

New Baseline
Scenario 0
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           1350
                                                                           1350
                                                                           1350
                                                                           1350
                                                                           1350
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                            1.2
                                                                            1.2
                                                                            1.2
                                                                            1.2
                                                                            1.2

Nox (lb/MMBtu)
                                                                           0.75
                                                                         0.3675
                                                                         0.2625
                                                                           0.45
                                                                           0.15
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                           1620
                                                                           1620
                                                                           1620
                                                                           1620
                                                                              0

Total Sulfate (SO4)(lb/hr)
                                                                              1
                                                                              1
                                                                              1
                                                                              1
                                                                              2

Nox (lb/hr)
                                                                         1012.5
                                                                        496.125
                                                                        354.375
                                                                          607.5
                                                                          202.5

HNO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0
                                                                              0

NO3
                                                                              0
                                                                              0
                                                                              0
                                                                              0
                                                                              0

PM10-2.5 (coarse PM)(lb/hr)
                                                                        149.726
                                                                        149.726
                                                                        149.726
                                                                        149.726
                                                                        149.726

PM2.5 (lb/hr)
                                                                        198.474
                                                                        198.474
                                                                        198.474
                                                                        198.474
                                                                        198.474

Stack Height (meters)
                                                                          152.4
                                                                          152.4
                                                                          152.4
                                                                          152.4
                                                                          152.4

Base Elevation (meters)
                                                                           1509
                                                                           1509
                                                                           1509
                                                                           1509
                                                                           1509

Stack Diameter (meters)
                                                                           3.35
                                                                           3.35
                                                                           3.35
                                                                           3.35
                                                                           3.35

Exit Velocity (meters/second)
                                                                          28.35
                                                                          28.35
                                                                          28.35
                                                                          28.35
                                                                          28.35

Exit Temperature (Kelvin)
                                                                         418.15
                                                                         418.15
                                                                         418.15
                                                                         418.15
                                                                         418.15

Dave Johnston Unit 2

New Baseline
Scenario 0
Scenario 1
Scenario 2
Scenario 3
Hourly Heat Input (mmBtu/hour)

                                                                           1350
                                                                           1350
                                                                           1350
                                                                           1350
                                                                           1350
                                   Emission
                                     Rates
SO2 (lb/MMBtu)
                                                                            1.2
                                                                            1.2
                                                                            1.2
                                                                            1.2
                                                                            1.2

Nox (lb/MMBtu)
                                                                           0.75
                                                                         0.3675
                                                                         0.2625
                                                                           0.45
                                                                           0.15
                                   Calpuff 
                                    Inputs
SO2 (lb/hr)
                                                                           1620
                                                                           1620
                                                                           1620
                                                                           1620
                                                                           1620

Total Sulfate (SO4)(lb/hr)
                                                                              1
                                                                              1
                                                                              1
                                                                              1
                                                                              2

Nox (lb/hr)
                                                                         1012.5
                                                                        496.125
                                                                        354.375
                                                                          607.5
                                                                          202.5

HNO3
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               

NO3
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               

PM10-2.5 (coarse PM)(lb/hr)
                                                                        149.726
                                                                        149.726
                                                                        149.726
                                                                        149.726
                                                                        149.726

PM2.5 (lb/hr)
                                                                        198.474
                                                                        198.474
                                                                        198.474
                                                                        198.474
                                                                        198.474

Stack Height (meters)
                                                                          152.4
                                                                          152.4
                                                                          152.4
                                                                          152.4
                                                                          152.4

Base Elevation (meters)
                                                                           1509
                                                                           1509
                                                                           1509
                                                                           1509
                                                                           1509

Stack Diameter (meters)
                                                                           3.35
                                                                           3.35
                                                                           3.35
                                                                           3.35
                                                                           3.35

Exit Velocity (meters/second)
                                                                          28.69
                                                                          28.69
                                                                          28.69
                                                                          28.69
                                                                          28.69

Exit Temperature (Kelvin)
                                                                         425.93
                                                                         425.93
                                                                         425.93
                                                                         425.93
                                                                         425.93