EPA’s CALPUFF Visibility Modeling Results
Table of Contents

Table of Contents................................................................................................................ 2

A. EPA modeling Results: Post-Consent Decree with Variable Background Ammonia 

and Method 6 ...................................................................................................................... 6

B. EPA modeling Results: Post-Consent Decree with Variable Background Ammonia 

and Method 8 .................................................................................................................... 10

C. EPA modeling Results: Post-Consent Decree with 1 ppb Background Ammonia and 

Method 6 ........................................................................................................................... 14

D. EPA modeling Results: Post-Consent Decree with 1 ppb Background Ammonia and 

Method 8 ........................................................................................................................... 18

E. EPA modeling Results: EPA Revised Baseline with Variable Background Ammonia 

and Method 6 .................................................................................................................... 22

F. EPA modeling Results: EPA Revised Baseline with Variable Background Ammonia 

and Method 8 .................................................................................................................... 26

G. EPA modeling Results: EPA Revised Baseline with 1 ppb Background Ammonia and 

Method 6 ........................................................................................................................... 30

H. EPA modeling Results: EPA Revised Baseline with 1 ppb Background Ammonia and 

Method 8 ........................................................................................................................... 34

I. EPA modeling Results: SCR with Variable Background Ammonia and Method 6 ..... 38

J. EPA modeling Results: SCR with Variable Background Ammonia and Method 8 ..... 42

K. EPA modeling Results: SCR with 1 ppb Background Ammonia and Method 6......... 46

L. EPA modeling Results: SCR with 1 ppb Background Ammonia and Method 8 ......... 50
List of Tables and Figures

Table A-1. Unit 1 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)........................................................................................ 7

Table A-2. Unit 2 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)........................................................................................ 7

Table A-3. Unit 3 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)........................................................................................ 8

Table A-4. Unit 4 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)........................................................................................ 8

Table A-5. Facility Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)........................................................................................ 9

Table B-1. Unit 1 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 11

Table B-2. Unit 2 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 11

Table B-3. Unit 3 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 12

Table B-4. Unit 4 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 12

Table B-5. Facility Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 13

Table C-1. Unit 1 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)....................................................................................................... 15

Table C-2. Unit 2 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)....................................................................................................... 15

Table C-3. Unit 3 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)....................................................................................................... 16

Table C-4. Unit 4 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)....................................................................................................... 16

Table C-5. Facility Post-Consent Decree Modeling Results (1 ppb Background 

Ammonia and Method 6)...................................................................................... 17

Table D-1. Unit 1 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)....................................................................................................... 19

Table D-2. Unit 2 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)....................................................................................................... 19

Table D-3. Unit 3 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)....................................................................................................... 20

Table D-4. Unit 4 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)....................................................................................................... 20

Table D-5. Facility Post-Consent Decree Modeling Results (1 ppb Background 

Ammonia and Method 8)...................................................................................... 21

Table E-1. Unit 1 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)...................................................................................... 23

Table E-2. Unit 2 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)...................................................................................... 23
Table E-3. Unit 3 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)...................................................................................... 24

Table E-4. Unit 4 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)...................................................................................... 24

Table E-5. Facility EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)...................................................................................... 25

Table F-1. Unit 1 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 27

Table F-2. Unit 2 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 27

Table F-3. Unit 3 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 28

Table F-4. Unit 4 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 28

Table F-5. Facility EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)...................................................................................... 29

Table G-1. Unit 1 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)...................................................................................... 31

Table G-2. Unit 2 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)...................................................................................... 31

Table G-3. Unit 3 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)...................................................................................... 32

Table G-4. Unit 4 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)...................................................................................... 32

Table G-5. Facility EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)...................................................................................... 33

Table H-1. Unit 1 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)...................................................................................... 35

Table H-2. Unit 2 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)...................................................................................... 35

Table H-3. Unit 3 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)...................................................................................... 36

Table H-4. Unit 4 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)...................................................................................... 36

Table H-5. Facility EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)...................................................................................... 37

Table I-1. Unit 1 SCR Modeling Results (Variable Background Ammonia and Method 6)

............................................................................................................................... 39

Table I-2. Unit 2 SCR Modeling Results (Variable Background Ammonia and Method 6)

............................................................................................................................... 39

Table I-3. Unit 3 SCR Modeling Results (Variable Background Ammonia and Method 6)

............................................................................................................................... 40

Table I-4. Unit 4 SCR Modeling Results (Variable Background Ammonia and Method 6)

............................................................................................................................... 40

Table I-5. Facility SCR Modeling Results (Variable Background Ammonia and Method 

6) ........................................................................................................................... 41
Table J-1. Unit 1 SCR Modeling Results (Variable Background Ammonia and Method 

8) ........................................................................................................................... 43

Table J-2. Unit 2 SCR Modeling Results (Variable Background Ammonia and Method 

8) ........................................................................................................................... 43

Table J-3. Unit 3 SCR Modeling Results (Variable Background Ammonia and Method 

8) ........................................................................................................................... 44

Table J-4. Unit 4 SCR Modeling Results (Variable Background Ammonia and Method 

8) ........................................................................................................................... 44

Table J-5. Facility SCR Modeling Results (Variable Background Ammonia and Method 

8) ........................................................................................................................... 45

Table K-1. Unit 1 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

............................................................................................................................... 47

Table K-2. Unit 2 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

............................................................................................................................... 47

Table K-3. Unit 3 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

............................................................................................................................... 48

Table K-4. Unit 4 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

............................................................................................................................... 48

Table K-5. Facility SCR Modeling Results (1 ppb Background Ammonia and Method 6)

............................................................................................................................... 49

Table L-1. Unit 1 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

............................................................................................................................... 51

Table L-2. Unit 2 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

............................................................................................................................... 51

Table L-3. Unit 3 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

............................................................................................................................... 52

Table L-4. Unit 4 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

............................................................................................................................... 52

Table L-5. Facility SCR Modeling Results (1 ppb Background Ammonia and Method 8)

............................................................................................................................... 53
A. EPA modeling Results: Post-Consent Decree with Variable 

Background Ammonia and Method 6
Table A-1. Unit 1 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.66 0.17 0.24 0.36 0.66

Bandelier Wilderness 0.25 0.25 0.16 0.22 0.25

Black Canyon of the Gunnison 

Wilderness 0.25 0.25 0.12 0.20 0.25

Canyonlands 0.82 0.40 0.34 0.52 0.82

Capitol Reef 0.51 0.10 0.13 0.24 0.51

La Garita Wilderness 0.26 0.37 0.20 0.28 0.37

Grand Canyon 0.16 0.06 0.07 0.09 0.16

Great Sand Dunes National Monument 0.16 0.30 0.21 0.22 0.30

Mesa Verde 1.02 1.06 0.90 0.99 1.06

Pecos Wilderness 0.16 0.21 0.15 0.18 0.21

Petrified Forest 0.10 0.07 0.08 0.08 0.10

San Pedro Parks Wilderness 0.35 0.34 0.31 0.33 0.35

Maroon Bells-Snowmass Wilderness 0.11 0.10 0.06 0.09 0.11

West Elk Wilderness 0.23 0.23 0.10 0.19 0.23

Weminuche Wilderness 0.36 0.53 0.36 0.41 0.53

Wheeler Peak Wilderness 0.17 0.21 0.15 0.17 0.21

Sum 5.56 4.62 3.56 4.58 6.11

Table A-2. Unit 2 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.66 0.17 0.24 0.36 0.66

Bandelier Wilderness 0.25 0.25 0.16 0.22 0.25

Black Canyon of the Gunnison 

Wilderness 0.25 0.25 0.12 0.20 0.25

Canyonlands 0.82 0.39 0.34 0.52 0.82

Capitol Reef 0.51 0.10 0.13 0.24 0.51

La Garita Wilderness 0.26 0.37 0.20 0.28 0.37

Grand Canyon 0.16 0.06 0.07 0.09 0.16

Great Sand Dunes National Monument 0.16 0.30 0.20 0.22 0.30

Mesa Verde 1.02 1.05 0.90 0.99 1.05

Pecos Wilderness 0.16 0.21 0.15 0.17 0.21

Petrified Forest 0.10 0.07 0.08 0.08 0.10

San Pedro Parks Wilderness 0.35 0.34 0.31 0.33 0.35

Maroon Bells-Snowmass Wilderness 0.11 0.10 0.06 0.09 0.11

West Elk Wilderness 0.23 0.23 0.10 0.18 0.23

Weminuche Wilderness 0.36 0.53 0.36 0.41 0.53

Wheeler Peak Wilderness 0.20 0.21 0.15 0.18 0.21

Sum 5.57 4.60 3.56 4.57 6.08
Table A-3. Unit 3 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.95 0.24 0.38 0.52 0.95

Bandelier Wilderness 0.38 0.39 0.25 0.34 0.39

Black Canyon of the Gunnison 

Wilderness 0.36 0.38 0.17 0.30 0.38

Canyonlands 1.24 0.53 0.45 0.74 1.24

Capitol Reef 0.61 0.13 0.19 0.31 0.61

La Garita Wilderness 0.39 0.56 0.30 0.42 0.56

Grand Canyon 0.23 0.08 0.11 0.14 0.23

Great Sand Dunes National Monument 0.25 0.45 0.32 0.34 0.45

Mesa Verde 1.29 1.38 1.18 1.28 1.38

Pecos Wilderness 0.24 0.32 0.25 0.27 0.32

Petrified Forest 0.15 0.11 0.12 0.12 0.15

San Pedro Parks Wilderness 0.50 0.50 0.47 0.49 0.50

Maroon Bells-Snowmass Wilderness 0.18 0.17 0.08 0.14 0.18

West Elk Wilderness 0.33 0.38 0.15 0.29 0.38

Weminuche Wilderness 0.54 0.74 0.48 0.59 0.74

Wheeler Peak Wilderness 0.27 0.28 0.24 0.26 0.28

Sum 7.91 6.62 5.14 6.56 8.74

Table A-4. Unit 4 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.94 0.23 0.37 0.51 0.94

Bandelier Wilderness 0.37 0.38 0.25 0.33 0.38

Black Canyon of the Gunnison 

Wilderness 0.35 0.37 0.17 0.30 0.37

Canyonlands 1.23 0.53 0.44 0.73 1.23

Capitol Reef 0.61 0.13 0.19 0.31 0.61

La Garita Wilderness 0.38 0.55 0.29 0.41 0.55

Grand Canyon 0.23 0.08 0.10 0.14 0.23

Great Sand Dunes National Monument 0.25 0.44 0.31 0.33 0.44

Mesa Verde 1.28 1.36 1.14 1.26 1.36

Pecos Wilderness 0.23 0.32 0.24 0.26 0.32

Petrified Forest 0.15 0.10 0.12 0.12 0.15

San Pedro Parks Wilderness 0.49 0.50 0.47 0.48 0.50

Maroon Bells-Snowmass Wilderness 0.17 0.16 0.08 0.14 0.17

West Elk Wilderness 0.32 0.37 0.15 0.28 0.37

Weminuche Wilderness 0.54 0.72 0.37 0.54 0.72

Wheeler Peak Wilderness 0.27 0.27 0.24 0.26 0.27

Sum 7.81 6.52 4.92 6.42 8.61
Table A-5. Facility Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.91 0.66 0.86 1.15 1.91

Bandelier Wilderness 1.02 0.91 0.73 0.88 1.02

Black Canyon of the Gunnison 

Wilderness 0.92 1.15 0.53 0.86 1.15

Canyonlands 2.14 1.24 1.17 1.52 2.14

Capitol Reef 1.62 0.45 0.61 0.90 1.62

La Garita Wilderness 0.93 1.46 0.74 1.04 1.46

Grand Canyon 0.67 0.27 0.30 0.41 0.67

Great Sand Dunes National Monument 0.79 1.17 0.92 0.96 1.17

Mesa Verde 2.25 2.61 2.26 2.37 2.61

Pecos Wilderness 0.68 0.95 0.71 0.78 0.95

Petrified Forest 0.46 0.33 0.38 0.39 0.46

San Pedro Parks Wilderness 1.27 1.23 1.07 1.19 1.27

Maroon Bells-Snowmass Wilderness 0.53 0.51 0.26 0.43 0.53

West Elk Wilderness 0.81 1.03 0.43 0.76 1.03

Weminuche Wilderness 1.27 1.79 1.19 1.42 1.79

Wheeler Peak Wilderness 0.77 0.88 0.66 0.77 0.88

Sum 18.03 16.63 12.80 15.82 20.65
B. EPA modeling Results: Post-Consent Decree with Variable 

Background Ammonia and Method 8
Table B-1. Unit 1 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year

maximum 2001 2002 2003

Arches 0.66 0.17 0.25 0.36 0.66

Bandelier Wilderness 0.24 0.26 0.16 0.22 0.26

Black Canyon of the Gunnison 

Wilderness 0.25 0.25 0.12 0.21 0.25

Canyonlands 0.89 0.39 0.37 0.55 0.89

Capitol Reef 0.51 0.10 0.12 0.24 0.51

La Garita Wilderness 0.26 0.40 0.21 0.29 0.40

Grand Canyon 0.15 0.06 0.07 0.09 0.15

Great Sand Dunes National Monument 0.15 0.31 0.21 0.22 0.31

Mesa Verde 1.28 1.31 1.16 1.25 1.31

Pecos Wilderness 0.17 0.21 0.16 0.18 0.21

Petrified Forest 0.09 0.06 0.07 0.08 0.09

San Pedro Parks Wilderness 0.41 0.40 0.37 0.39 0.41

Maroon Bells-Snowmass Wilderness 0.13 0.10 0.07 0.10 0.13

West Elk Wilderness 0.26 0.26 0.11 0.21 0.26

Weminuche Wilderness 0.41 0.65 0.41 0.49 0.65

Wheeler Peak Wilderness 0.20 0.22 0.17 0.20 0.22

Sum 6.05 5.14 4.02 5.07 6.70

Table B-2. Unit 2 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.65 0.17 0.25 0.36 0.65

Bandelier Wilderness 0.25 0.25 0.16 0.22 0.25

Black Canyon of the Gunnison 

Wilderness 0.25 0.25 0.12 0.21 0.25

Canyonlands 0.88 0.39 0.37 0.55 0.88

Capitol Reef 0.51 0.10 0.12 0.24 0.51

La Garita Wilderness 0.26 0.39 0.21 0.29 0.39

Grand Canyon 0.15 0.06 0.07 0.09 0.15

Great Sand Dunes National Monument 0.15 0.31 0.21 0.22 0.31

Mesa Verde 1.27 1.30 1.16 1.24 1.30

Pecos Wilderness 0.17 0.21 0.16 0.18 0.21

Petrified Forest 0.09 0.06 0.07 0.08 0.09

San Pedro Parks Wilderness 0.41 0.39 0.37 0.39 0.41

Maroon Bells-Snowmass Wilderness 0.13 0.10 0.07 0.10 0.13

West Elk Wilderness 0.25 0.26 0.11 0.21 0.26

Weminuche Wilderness 0.41 0.65 0.41 0.49 0.65

Wheeler Peak Wilderness 0.20 0.22 0.17 0.19 0.22

Sum 6.03 5.11 4.01 5.05 6.67
Table B-3. Unit 3 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.97 0.23 0.38 0.53 0.97

Bandelier Wilderness 0.38 0.39 0.27 0.35 0.39

Black Canyon of the Gunnison 

Wilderness 0.37 0.40 0.18 0.32 0.40

Canyonlands 1.34 0.53 0.52 0.80 1.34

Capitol Reef 0.61 0.13 0.19 0.31 0.61

La Garita Wilderness 0.38 0.61 0.33 0.44 0.61

Grand Canyon 0.23 0.08 0.10 0.13 0.23

Great Sand Dunes National Monument 0.24 0.46 0.31 0.34 0.46

Mesa Verde 1.59 1.73 1.52 1.61 1.73

Pecos Wilderness 0.25 0.34 0.26 0.28 0.34

Petrified Forest 0.16 0.10 0.11 0.12 0.16

San Pedro Parks Wilderness 0.62 0.57 0.59 0.59 0.62

Maroon Bells-Snowmass Wilderness 0.20 0.18 0.09 0.16 0.20

West Elk Wilderness 0.36 0.44 0.18 0.33 0.44

Weminuche Wilderness 0.61 0.90 0.60 0.71 0.90

Wheeler Peak Wilderness 0.29 0.32 0.27 0.29 0.32

Sum 8.58 7.41 5.91 7.30 9.70

Table B-4. Unit 4 Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.89 0.78 0.40 0.69 0.89

Bandelier Wilderness 0.37 0.39 0.26 0.34 0.39

Black Canyon of the Gunnison 

Wilderness 0.36 0.39 0.18 0.31 0.39

Canyonlands 1.32 0.53 0.51 0.79 1.32

Capitol Reef 0.61 0.14 0.19 0.31 0.61

La Garita Wilderness 0.38 0.60 0.32 0.43 0.60

Grand Canyon 0.22 0.08 0.10 0.13 0.22

Great Sand Dunes National Monument 0.23 0.46 0.31 0.33 0.46

Mesa Verde 1.58 1.70 1.51 1.60 1.70

Pecos Wilderness 0.25 0.33 0.25 0.28 0.33

Petrified Forest 0.15 0.10 0.11 0.12 0.15

San Pedro Parks Wilderness 0.61 0.57 0.58 0.58 0.61

Maroon Bells-Snowmass Wilderness 0.20 0.17 0.09 0.15 0.20

West Elk Wilderness 0.36 0.43 0.18 0.32 0.43

Weminuche Wilderness 0.60 0.89 0.59 0.69 0.89

Wheeler Peak Wilderness 0.28 0.31 0.27 0.29 0.31

Sum 8.40 7.85 5.85 7.37 9.49
Table B-5. Facility Post-Consent Decree Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.97 0.67 0.87 1.17 1.97

Bandelier Wilderness 1.04 0.93 0.75 0.91 1.04

Black Canyon of the Gunnison 

Wilderness 0.96 1.17 0.58 0.90 1.17

Canyonlands 2.34 1.36 1.23 1.64 2.34

Capitol Reef 1.66 0.46 0.59 0.90 1.66

La Garita Wilderness 0.99 1.51 0.81 1.10 1.51

Grand Canyon 0.64 0.25 0.31 0.40 0.64

Great Sand Dunes National Monument 0.73 1.19 0.93 0.95 1.19

Mesa Verde 2.74 3.24 2.88 2.95 3.24

Pecos Wilderness 0.73 1.03 0.74 0.83 1.03

Petrified Forest 0.45 0.32 0.36 0.37 0.45

San Pedro Parks Wilderness 1.54 1.38 1.32 1.41 1.54

Maroon Bells-Snowmass Wilderness 0.61 0.56 0.30 0.49 0.61

West Elk Wilderness 0.90 1.15 0.52 0.86 1.15

Weminuche Wilderness 1.54 2.22 1.43 1.73 2.22

Wheeler Peak Wilderness 0.84 0.99 0.75 0.86 0.99

Sum 19.68 18.42 14.37 17.49 22.74
C. EPA modeling Results: Post-Consent Decree with 1 ppb 

Background Ammonia and Method 6
Table C-1. Unit 1 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.86 0.23 0.32 0.47 0.86

Bandelier Wilderness 0.29 0.27 0.22 0.26 0.29

Black Canyon of the Gunnison 

Wilderness 0.30 0.28 0.13 0.23 0.30

Canyonlands 1.07 0.51 0.51 0.70 1.07

Capitol Reef 0.60 0.10 0.15 0.28 0.60

La Garita Wilderness 0.29 0.39 0.23 0.30 0.39

Grand Canyon 0.20 0.07 0.09 0.12 0.20

Great Sand Dunes National Monument 0.19 0.33 0.23 0.25 0.33

Mesa Verde 1.29 1.37 1.30 1.32 1.37

Pecos Wilderness 0.20 0.28 0.19 0.22 0.28

Petrified Forest 0.12 0.10 0.09 0.10 0.12

San Pedro Parks Wilderness 0.43 0.37 0.39 0.40 0.43

Maroon Bells-Snowmass Wilderness 0.13 0.11 0.07 0.10 0.13

West Elk Wilderness 0.27 0.25 0.12 0.21 0.27

Weminuche Wilderness 0.44 0.59 0.39 0.47 0.59

Wheeler Peak Wilderness 0.21 0.22 0.16 0.20 0.22

Sum 6.87 5.45 4.58 5.63 7.43

Table C-2. Unit 2 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.85 0.23 0.32 0.47 0.85

Bandelier Wilderness 0.29 0.27 0.22 0.26 0.29

Black Canyon of the Gunnison 

Wilderness 0.29 0.27 0.13 0.23 0.29

Canyonlands 1.07 0.51 0.51 0.70 1.07

Capitol Reef 0.59 0.10 0.15 0.28 0.59

La Garita Wilderness 0.29 0.38 0.23 0.30 0.38

Grand Canyon 0.20 0.07 0.09 0.12 0.20

Great Sand Dunes National Monument 0.18 0.33 0.23 0.25 0.33

Mesa Verde 1.29 1.36 1.31 1.32 1.36

Pecos Wilderness 0.19 0.28 0.19 0.22 0.28

Petrified Forest 0.12 0.10 0.09 0.10 0.12

San Pedro Parks Wilderness 0.43 0.37 0.39 0.40 0.43

Maroon Bells-Snowmass Wilderness 0.13 0.11 0.07 0.10 0.13

West Elk Wilderness 0.27 0.25 0.12 0.21 0.27

Weminuche Wilderness 0.43 0.58 0.39 0.47 0.58

Wheeler Peak Wilderness 0.21 0.22 0.16 0.20 0.22

Sum 6.83 5.43 4.59 5.62 7.40
Table C-3. Unit 3 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.21 0.32 0.50 0.67 1.21

Bandelier Wilderness 0.46 0.42 0.32 0.40 0.46

Black Canyon of the Gunnison 

Wilderness 0.42 0.45 0.21 0.36 0.45

Canyonlands 1.54 0.69 0.70 0.98 1.54

Capitol Reef 0.73 0.15 0.24 0.37 0.73

La Garita Wilderness 0.46 0.59 0.35 0.47 0.59

Grand Canyon 0.31 0.10 0.13 0.18 0.31

Great Sand Dunes National Monument 0.29 0.50 0.36 0.38 0.50

Mesa Verde 1.85 1.89 1.71 1.82 1.89

Pecos Wilderness 0.28 0.43 0.31 0.34 0.43

Petrified Forest 0.17 0.16 0.13 0.15 0.17

San Pedro Parks Wilderness 0.67 0.59 0.59 0.62 0.67

Maroon Bells-Snowmass Wilderness 0.21 0.19 0.09 0.16 0.21

West Elk Wilderness 0.46 0.41 0.19 0.35 0.46

Weminuche Wilderness 0.66 0.90 0.59 0.72 0.90

Wheeler Peak Wilderness 0.35 0.31 0.25 0.30 0.35

Sum 10.06 8.08 6.66 8.27 10.85

Table C-4. Unit 4 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.19 0.31 0.49 0.66 1.19

Bandelier Wilderness 0.45 0.41 0.31 0.39 0.45

Black Canyon of the Gunnison 

Wilderness 0.41 0.44 0.20 0.35 0.44

Canyonlands 1.52 0.70 0.69 0.97 1.52

Capitol Reef 0.72 0.15 0.23 0.37 0.72

La Garita Wilderness 0.46 0.58 0.35 0.46 0.58

Grand Canyon 0.30 0.10 0.13 0.18 0.30

Great Sand Dunes National Monument 0.29 0.49 0.35 0.38 0.49

Mesa Verde 1.88 1.94 1.69 1.84 1.94

Pecos Wilderness 0.27 0.41 0.30 0.33 0.41

Petrified Forest 0.17 0.15 0.12 0.15 0.17

San Pedro Parks Wilderness 0.66 0.58 0.58 0.61 0.66

Maroon Bells-Snowmass Wilderness 0.20 0.19 0.09 0.16 0.20

West Elk Wilderness 0.45 0.41 0.19 0.35 0.45

Weminuche Wilderness 0.65 0.87 0.57 0.70 0.87

Wheeler Peak Wilderness 0.34 0.30 0.25 0.30 0.34

Sum 9.96 8.03 6.53 8.17 10.74
Table C-5. Facility Post-Consent Decree Modeling Results (1 ppb Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 3.45 0.99 1.53 1.99 3.45

Bandelier Wilderness 1.38 1.29 0.96 1.21 1.38

Black Canyon of the Gunnison 

Wilderness 1.34 1.38 0.61 1.11 1.38

Canyonlands 4.21 1.98 2.00 2.73 4.21

Capitol Reef 2.39 0.47 0.74 1.20 2.39

La Garita Wilderness 1.41 1.81 1.09 1.44 1.81

Grand Canyon 0.98 0.34 0.42 0.58 0.98

Great Sand Dunes National Monument 0.90 1.54 1.12 1.19 1.54

Mesa Verde 4.30 4.36 3.99 4.22 4.36

Pecos Wilderness 0.88 1.29 0.92 1.03 1.29

Petrified Forest 0.55 0.48 0.40 0.48 0.55

San Pedro Parks Wilderness 1.92 1.76 1.81 1.83 1.92

Maroon Bells-Snowmass Wilderness 0.64 0.56 0.34 0.51 0.64

West Elk Wilderness 1.41 1.22 0.61 1.08 1.41

Weminuche Wilderness 1.95 2.45 1.76 2.05 2.45

Wheeler Peak Wilderness 1.05 1.00 0.77 0.94 1.05

Sum 28.78 22.92 19.07 23.59 30.82
D. EPA modeling Results: Post-Consent Decree with 1 ppb 

Background Ammonia and Method 8
Table D-1. Unit 1 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.85 0.23 0.33 0.47 0.85

Bandelier Wilderness 0.30 0.28 0.23 0.27 0.30

Black Canyon of the Gunnison 

Wilderness 0.29 0.28 0.13 0.23 0.29

Canyonlands 1.16 0.51 0.55 0.74 1.16

Capitol Reef 0.61 0.10 0.14 0.28 0.61

La Garita Wilderness 0.30 0.41 0.25 0.32 0.41

Grand Canyon 0.20 0.06 0.08 0.11 0.20

Great Sand Dunes National Monument 0.17 0.33 0.23 0.24 0.33

Mesa Verde 1.58 1.68 1.74 1.67 1.74

Pecos Wilderness 0.21 0.28 0.20 0.23 0.28

Petrified Forest 0.12 0.09 0.08 0.10 0.12

San Pedro Parks Wilderness 0.50 0.43 0.46 0.47 0.50

Maroon Bells-Snowmass Wilderness 0.14 0.12 0.08 0.11 0.14

West Elk Wilderness 0.31 0.28 0.13 0.24 0.31

Weminuche Wilderness 0.53 0.73 0.48 0.58 0.73

Wheeler Peak Wilderness 0.23 0.24 0.18 0.22 0.24

Sum 7.52 6.05 5.30 6.29 8.23

Table D-2. Unit 2 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.85 0.23 0.32 0.47 0.85

Bandelier Wilderness 0.30 0.28 0.24 0.27 0.30

Black Canyon of the Gunnison 

Wilderness 0.29 0.28 0.13 0.23 0.29

Canyonlands 1.16 0.51 0.55 0.74 1.16

Capitol Reef 0.60 0.10 0.14 0.28 0.60

La Garita Wilderness 0.30 0.41 0.25 0.32 0.41

Grand Canyon 0.20 0.06 0.08 0.11 0.20

Great Sand Dunes National Monument 0.17 0.32 0.23 0.24 0.32

Mesa Verde 1.58 1.67 1.75 1.67 1.75

Pecos Wilderness 0.21 0.28 0.20 0.23 0.28

Petrified Forest 0.12 0.09 0.08 0.10 0.12

San Pedro Parks Wilderness 0.50 0.43 0.46 0.46 0.50

Maroon Bells-Snowmass Wilderness 0.14 0.12 0.08 0.11 0.14

West Elk Wilderness 0.31 0.28 0.13 0.24 0.31

Weminuche Wilderness 0.52 0.73 0.49 0.58 0.73

Wheeler Peak Wilderness 0.23 0.24 0.18 0.22 0.24

Sum 7.48 6.02 5.31 6.27 8.21
Table D-3. Unit 3 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.24 0.32 0.51 0.69 1.24

Bandelier Wilderness 0.47 0.43 0.34 0.41 0.47

Black Canyon of the Gunnison 

Wilderness 0.44 0.46 0.21 0.37 0.46

Canyonlands 1.72 0.72 0.79 1.08 1.72

Capitol Reef 0.74 0.15 0.23 0.37 0.74

La Garita Wilderness 0.46 0.64 0.37 0.49 0.64

Grand Canyon 0.31 0.09 0.13 0.17 0.31

Great Sand Dunes National Monument 0.28 0.50 0.34 0.37 0.50

Mesa Verde 2.42 2.40 2.27 2.36 2.42

Pecos Wilderness 0.30 0.44 0.34 0.36 0.44

Petrified Forest 0.17 0.15 0.12 0.15 0.17

San Pedro Parks Wilderness 0.79 0.69 0.71 0.73 0.79

Maroon Bells-Snowmass Wilderness 0.24 0.21 0.10 0.18 0.24

West Elk Wilderness 0.53 0.49 0.22 0.42 0.53

Weminuche Wilderness 0.78 1.08 0.70 0.85 1.08

Wheeler Peak Wilderness 0.38 0.35 0.29 0.34 0.38

Sum 11.25 9.13 7.65 9.34 12.11

Table D-4. Unit 4 Post-Consent Decree Modeling Results (1 ppb Background Ammonia 

and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.21 0.31 0.50 0.67 1.21

Bandelier Wilderness 0.46 0.42 0.33 0.41 0.46

Black Canyon of the Gunnison 

Wilderness 0.43 0.45 0.21 0.36 0.45

Canyonlands 1.69 0.71 0.78 1.06 1.69

Capitol Reef 0.73 0.15 0.22 0.37 0.73

La Garita Wilderness 0.46 0.63 0.37 0.48 0.63

Grand Canyon 0.30 0.09 0.12 0.17 0.30

Great Sand Dunes National Monument 0.27 0.49 0.34 0.37 0.49

Mesa Verde 2.40 2.35 2.28 2.34 2.40

Pecos Wilderness 0.30 0.42 0.33 0.35 0.42

Petrified Forest 0.17 0.15 0.12 0.15 0.17

San Pedro Parks Wilderness 0.77 0.68 0.69 0.71 0.77

Maroon Bells-Snowmass Wilderness 0.23 0.20 0.10 0.18 0.23

West Elk Wilderness 0.52 0.50 0.22 0.41 0.52

Weminuche Wilderness 0.75 1.06 0.69 0.83 1.06

Wheeler Peak Wilderness 0.37 0.34 0.28 0.33 0.37

Sum 11.08 8.94 7.58 9.20 11.93
Table D-5. Facility Post-Consent Decree Modeling Results (1 ppb Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 3.55 0.98 1.56 2.03 3.55

Bandelier Wilderness 1.44 1.32 1.05 1.27 1.44

Black Canyon of the Gunnison 

Wilderness 1.38 1.44 0.64 1.15 1.44

Canyonlands 4.69 2.16 2.29 3.05 4.69

Capitol Reef 2.43 0.48 0.73 1.21 2.43

La Garita Wilderness 1.42 1.97 1.16 1.51 1.97

Grand Canyon 0.97 0.30 0.40 0.56 0.97

Great Sand Dunes National Monument 0.88 1.56 1.09 1.18 1.56

Mesa Verde 5.13 5.18 5.07 5.13 5.18

Pecos Wilderness 0.95 1.32 1.06 1.11 1.32

Petrified Forest 0.54 0.47 0.39 0.47 0.54

San Pedro Parks Wilderness 2.23 2.05 2.11 2.13 2.23

Maroon Bells-Snowmass Wilderness 0.71 0.63 0.35 0.56 0.71

West Elk Wilderness 1.64 1.45 0.70 1.26 1.64

Weminuche Wilderness 2.25 2.94 2.05 2.41 2.94

Wheeler Peak Wilderness 1.16 1.13 0.91 1.07 1.16

Sum 31.36 25.36 21.56 26.09 33.76
E. EPA modeling Results: EPA Revised Baseline with Variable 

Background Ammonia and Method 6
Table E-1. Unit 1 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.64 0.16 0.24 0.35 0.64

Bandelier Wilderness 0.24 0.24 0.15 0.21 0.24

Black Canyon of the Gunnison 

Wilderness 0.24 0.24 0.11 0.20 0.24

Canyonlands 0.81 0.38 0.32 0.50 0.81

Capitol Reef 0.48 0.09 0.12 0.23 0.48

La Garita Wilderness 0.25 0.36 0.20 0.27 0.36

Grand Canyon 0.15 0.03 0.07 0.08 0.15

Great Sand Dunes National Monument 0.15 0.29 0.20 0.21 0.29

Mesa Verde 0.99 1.02 0.90 0.97 1.02

Pecos Wilderness 0.12 0.20 0.15 0.16 0.20

Petrified Forest 0.09 0.09 0.07 0.08 0.09

San Pedro Parks Wilderness 0.34 0.31 0.30 0.32 0.34

Maroon Bells-Snowmass Wilderness 0.11 0.09 0.06 0.09 0.11

West Elk Wilderness 0.22 0.23 0.09 0.18 0.23

Weminuche Wilderness 0.34 0.52 0.40 0.42 0.52

Wheeler Peak Wilderness 0.17 0.17 0.14 0.16 0.17

Sum 5.34 4.42 3.50 4.42 5.89

Table E-2. Unit 2 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.64 0.16 0.24 0.34 0.64

Bandelier Wilderness 0.24 0.24 0.15 0.21 0.24

Black Canyon of the Gunnison 

Wilderness 0.24 0.24 0.11 0.20 0.24

Canyonlands 0.80 0.38 0.32 0.50 0.80

Capitol Reef 0.49 0.09 0.12 0.23 0.49

La Garita Wilderness 0.25 0.36 0.21 0.27 0.36

Grand Canyon 0.14 0.05 0.07 0.09 0.14

Great Sand Dunes National Monument 0.15 0.29 0.20 0.21 0.29

Mesa Verde 0.99 1.02 0.90 0.97 1.02

Pecos Wilderness 0.16 0.20 0.15 0.17 0.20

Petrified Forest 0.09 0.06 0.07 0.07 0.09

San Pedro Parks Wilderness 0.34 0.35 0.30 0.33 0.35

Maroon Bells-Snowmass Wilderness 0.10 0.09 0.06 0.08 0.10

West Elk Wilderness 0.22 0.22 0.09 0.18 0.22

Weminuche Wilderness 0.34 0.52 0.35 0.40 0.52

Wheeler Peak Wilderness 0.17 0.19 0.14 0.17 0.19

Sum 5.35 4.47 3.45 4.42 5.89
Table E-3. Unit 3 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.93 0.23 0.36 0.51 0.93

Bandelier Wilderness 0.37 0.38 0.24 0.33 0.38

Black Canyon of the Gunnison 

Wilderness 0.34 0.37 0.17 0.29 0.37

Canyonlands 1.23 0.51 0.44 0.72 1.23

Capitol Reef 0.58 0.13 0.18 0.30 0.58

La Garita Wilderness 0.37 0.55 0.29 0.41 0.55

Grand Canyon 0.22 0.08 0.10 0.13 0.22

Great Sand Dunes National Monument 0.24 0.44 0.31 0.33 0.44

Mesa Verde 1.28 1.36 1.17 1.27 1.36

Pecos Wilderness 0.23 0.31 0.24 0.26 0.31

Petrified Forest 0.16 0.10 0.10 0.12 0.16

San Pedro Parks Wilderness 0.48 0.48 0.46 0.48 0.48

Maroon Bells-Snowmass Wilderness 0.17 0.16 0.08 0.13 0.17

West Elk Wilderness 0.32 0.38 0.15 0.28 0.38

Weminuche Wilderness 0.52 0.73 0.47 0.57 0.73

Wheeler Peak Wilderness 0.25 0.27 0.23 0.25 0.27

Sum 7.69 6.46 4.98 6.38 8.55

Table E-4. Unit 4 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year

maximum 2001 2002 2003

Arches 0.92 0.23 0.36 0.50 0.92

Bandelier Wilderness 0.36 0.37 0.24 0.33 0.37

Black Canyon of the Gunnison 

Wilderness 0.34 0.39 0.17 0.30 0.39

Canyonlands 1.21 0.52 0.43 0.72 1.21

Capitol Reef 0.59 0.13 0.18 0.30 0.59

La Garita Wilderness 0.37 0.58 0.29 0.41 0.58

Grand Canyon 0.23 0.08 0.10 0.14 0.23

Great Sand Dunes National Monument 0.23 0.43 0.30 0.32 0.43

Mesa Verde 1.44 1.34 1.13 1.30 1.44

Pecos Wilderness 0.23 0.30 0.23 0.25 0.30

Petrified Forest 0.14 0.12 0.10 0.12 0.14

San Pedro Parks Wilderness 0.48 0.48 0.46 0.47 0.48

Maroon Bells-Snowmass Wilderness 0.17 0.15 0.07 0.13 0.17

West Elk Wilderness 0.31 0.36 0.15 0.27 0.36

Weminuche Wilderness 0.50 0.71 0.45 0.56 0.71

Wheeler Peak Wilderness 0.25 0.26 0.23 0.25 0.26

Sum 7.77 6.45 4.89 6.37 8.59
Table E-5. Facility EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.91 0.64 0.85 1.13 1.91

Bandelier Wilderness 1.01 0.87 0.70 0.86 1.01

Black Canyon of the Gunnison 

Wilderness 0.90 1.12 0.51 0.84 1.12

Canyonlands 2.11 1.22 1.14 1.49 2.11

Capitol Reef 1.62 0.43 0.56 0.87 1.62

La Garita Wilderness 0.92 1.44 0.71 1.03 1.44

Grand Canyon 0.63 0.25 0.29 0.39 0.63

Great Sand Dunes National Monument 0.75 1.14 0.87 0.92 1.14

Mesa Verde 2.21 2.56 2.17 2.31 2.56

Pecos Wilderness 0.66 0.92 0.68 0.75 0.92

Petrified Forest 0.44 0.31 0.33 0.36 0.44

San Pedro Parks Wilderness 1.22 1.18 1.05 1.15 1.22

Maroon Bells-Snowmass Wilderness 0.52 0.49 0.25 0.42 0.52

West Elk Wilderness 0.79 0.99 0.42 0.73 0.99

Weminuche Wilderness 1.25 1.75 1.17 1.39 1.75

Wheeler Peak Wilderness 0.74 0.85 0.63 0.74 0.85

Sum 17.67 16.15 12.33 15.38 20.20
F. EPA modeling Results: EPA Revised Baseline with Variable 

Background Ammonia and Method 8
Table F-1. Unit 1 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.64 0.16 0.24 0.35 0.64

Bandelier Wilderness 0.24 0.25 0.28 0.25 0.28

Black Canyon of the Gunnison 

Wilderness 0.24 0.25 0.12 0.20 0.25

Canyonlands 0.87 0.38 0.35 0.53 0.87

Capitol Reef 0.50 0.08 0.11 0.23 0.50

La Garita Wilderness 0.25 0.39 0.21 0.28 0.39

Grand Canyon 0.14 0.05 0.06 0.08 0.14

Great Sand Dunes National Monument 0.14 0.30 0.20 0.22 0.30

Mesa Verde 1.24 1.30 1.16 1.23 1.30

Pecos Wilderness 0.17 0.21 0.16 0.18 0.21

Petrified Forest 0.09 0.12 0.06 0.09 0.12

San Pedro Parks Wilderness 0.41 0.35 0.37 0.37 0.41

Maroon Bells-Snowmass Wilderness 0.13 0.10 0.07 0.10 0.13

West Elk Wilderness 0.25 0.25 0.13 0.21 0.25

Weminuche Wilderness 0.39 0.64 0.40 0.48 0.64

Wheeler Peak Wilderness 0.19 0.19 0.16 0.18 0.19

Sum 5.88 5.02 4.07 4.99 6.60

Table F-2. Unit 2 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.63 0.16 0.24 0.34 0.63

Bandelier Wilderness 0.23 0.28 0.16 0.23 0.28

Black Canyon of the Gunnison 

Wilderness 0.23 0.24 0.12 0.20 0.24

Canyonlands 0.87 0.38 0.35 0.53 0.87

Capitol Reef 0.49 0.08 0.11 0.23 0.49

La Garita Wilderness 0.25 0.39 0.22 0.28 0.39

Grand Canyon 0.16 0.05 0.06 0.09 0.16

Great Sand Dunes National Monument 0.14 0.30 0.20 0.22 0.30

Mesa Verde 1.03 1.29 1.16 1.16 1.29

Pecos Wilderness 0.17 0.21 0.16 0.18 0.21

Petrified Forest 0.09 0.06 0.07 0.07 0.09

San Pedro Parks Wilderness 0.40 0.38 0.37 0.38 0.40

Maroon Bells-Snowmass Wilderness 0.13 0.10 0.07 0.10 0.13

West Elk Wilderness 0.25 0.25 0.11 0.20 0.25

Weminuche Wilderness 0.39 0.64 0.36 0.46 0.64

Wheeler Peak Wilderness 0.19 0.20 0.16 0.19 0.20

Sum 5.66 5.02 3.90 4.86 6.58
Table F-3. Unit 3 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.95 0.23 0.37 0.52 0.95

Bandelier Wilderness 0.37 0.39 0.26 0.34 0.39

Black Canyon of the Gunnison 

Wilderness 0.34 0.39 0.18 0.30 0.39

Canyonlands 1.33 0.51 0.50 0.78 1.33

Capitol Reef 0.60 0.13 0.18 0.30 0.60

La Garita Wilderness 0.38 0.59 0.32 0.43 0.59

Grand Canyon 0.21 0.08 0.10 0.13 0.21

Great Sand Dunes National Monument 0.22 0.45 0.31 0.33 0.45

Mesa Verde 1.58 1.71 1.51 1.60 1.71

Pecos Wilderness 0.25 0.33 0.25 0.27 0.33

Petrified Forest 0.17 0.10 0.10 0.12 0.17

San Pedro Parks Wilderness 0.60 0.56 0.59 0.58 0.60

Maroon Bells-Snowmass Wilderness 0.20 0.17 0.09 0.15 0.20

West Elk Wilderness 0.35 0.42 0.18 0.32 0.42

Weminuche Wilderness 0.58 0.89 0.59 0.69 0.89

Wheeler Peak Wilderness 0.28 0.27 0.27 0.27 0.28

Sum 8.40 7.21 5.77 7.12 9.49

Table F-4. Unit 4 EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.94 0.22 0.36 0.51 0.94

Bandelier Wilderness 0.37 0.38 0.25 0.33 0.38

Black Canyon of the Gunnison 

Wilderness 0.34 0.44 0.18 0.32 0.44

Canyonlands 1.31 0.52 0.49 0.77 1.31

Capitol Reef 0.60 0.12 0.18 0.30 0.60

La Garita Wilderness 0.37 0.76 0.31 0.48 0.76

Grand Canyon 0.23 0.07 0.10 0.13 0.23

Great Sand Dunes National Monument 0.22 0.44 0.32 0.33 0.44

Mesa Verde 1.57 1.69 1.47 1.58 1.69

Pecos Wilderness 0.24 0.32 0.24 0.27 0.32

Petrified Forest 0.14 0.16 0.09 0.13 0.16

San Pedro Parks Wilderness 0.59 0.56 0.58 0.57 0.59

Maroon Bells-Snowmass Wilderness 0.20 0.17 0.09 0.15 0.20

West Elk Wilderness 0.35 0.42 0.17 0.31 0.42

Weminuche Wilderness 0.57 0.88 0.57 0.67 0.88

Wheeler Peak Wilderness 0.27 0.30 0.27 0.28 0.30

Sum 8.30 7.44 5.67 7.14 9.64
Table F-5. Facility EPA Revised Baseline Modeling Results (Variable Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.98 0.66 0.85 1.16 1.98

Bandelier Wilderness 1.01 0.89 0.74 0.88 1.01

Black Canyon of the Gunnison 

Wilderness 0.91 1.13 0.56 0.87 1.13

Canyonlands 2.34 1.33 1.18 1.62 2.34

Capitol Reef 1.63 0.41 0.56 0.87 1.63

La Garita Wilderness 0.98 1.48 0.81 1.09 1.48

Grand Canyon 0.60 0.24 0.29 0.38 0.60

Great Sand Dunes National Monument 0.70 1.16 0.91 0.92 1.16

Mesa Verde 2.74 3.22 2.85 2.93 3.22

Pecos Wilderness 0.72 0.99 0.72 0.81 0.99

Petrified Forest 0.43 0.30 0.31 0.35 0.43

San Pedro Parks Wilderness 1.54 1.36 1.29 1.40 1.54

Maroon Bells-Snowmass Wilderness 0.60 0.55 0.29 0.48 0.60

West Elk Wilderness 0.87 1.14 0.51 0.84 1.14

Weminuche Wilderness 1.50 2.20 1.40 1.70 2.20

Wheeler Peak Wilderness 0.81 0.96 0.73 0.83 0.96

Sum 19.33 18.01 14.00 17.11 22.40
G. EPA modeling Results: EPA Revised Baseline with 1 ppb 

Background Ammonia and Method 6
Table G-1. Unit 1 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.83 0.22 0.31 0.46 0.83

Bandelier Wilderness 0.28 0.26 0.21 0.25 0.28

Black Canyon of the Gunnison 

Wilderness 0.28 0.27 0.13 0.23 0.28

Canyonlands 1.05 0.50 0.50 0.68 1.05

Capitol Reef 0.58 0.09 0.13 0.27 0.58

La Garita Wilderness 0.28 0.38 0.22 0.29 0.38

Grand Canyon 0.19 0.06 0.08 0.11 0.19

Great Sand Dunes National Monument 0.18 0.32 0.22 0.24 0.32

Mesa Verde 1.44 1.33 1.62 1.46 1.62

Pecos Wilderness 0.19 0.28 0.19 0.22 0.28

Petrified Forest 0.12 0.09 0.08 0.10 0.12

San Pedro Parks Wilderness 0.42 0.36 0.43 0.40 0.43

Maroon Bells-Snowmass Wilderness 0.17 0.10 0.06 0.11 0.17

West Elk Wilderness 0.26 0.25 0.12 0.21 0.26

Weminuche Wilderness 0.43 0.58 0.37 0.46 0.58

Wheeler Peak Wilderness 0.20 0.21 0.16 0.19 0.21

Sum 6.90 5.30 4.81 5.67 7.59

Table G-2. Unit 2 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.83 0.22 0.31 0.45 0.83

Bandelier Wilderness 0.28 0.26 0.21 0.25 0.28

Black Canyon of the Gunnison 

Wilderness 0.28 0.27 0.13 0.23 0.28

Canyonlands 1.04 0.50 0.32 0.62 1.04

Capitol Reef 0.58 0.09 0.14 0.27 0.58

La Garita Wilderness 0.28 0.53 0.22 0.34 0.53

Grand Canyon 0.23 0.06 0.08 0.12 0.23

Great Sand Dunes National Monument 0.18 0.37 0.20 0.25 0.37

Mesa Verde 1.43 1.32 1.62 1.46 1.62

Pecos Wilderness 0.19 0.27 0.20 0.22 0.27

Petrified Forest 0.12 0.05 0.08 0.08 0.12

San Pedro Parks Wilderness 0.42 0.35 0.43 0.40 0.43

Maroon Bells-Snowmass Wilderness 0.12 0.10 0.07 0.10 0.12

West Elk Wilderness 0.26 0.24 0.12 0.21 0.26

Weminuche Wilderness 0.42 0.58 0.37 0.46 0.58

Wheeler Peak Wilderness 0.20 0.21 0.16 0.19 0.21

Sum 6.86 5.43 4.65 5.65 7.75
Table G-3. Unit 3 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.18 0.31 0.49 0.66 1.18

Bandelier Wilderness 0.43 0.41 0.31 0.38 0.43

Black Canyon of the Gunnison 

Wilderness 0.41 0.44 0.20 0.35 0.44

Canyonlands 1.51 0.67 0.68 0.96 1.51

Capitol Reef 0.71 0.14 0.22 0.36 0.71

La Garita Wilderness 0.45 0.73 0.35 0.51 0.73

Grand Canyon 0.30 0.09 0.12 0.17 0.30

Great Sand Dunes National Monument 0.28 0.55 0.35 0.39 0.55

Mesa Verde 2.27 1.87 1.90 2.01 2.27

Pecos Wilderness 0.28 0.41 0.30 0.33 0.41

Petrified Forest 0.17 0.15 0.12 0.15 0.17

San Pedro Parks Wilderness 0.66 0.66 0.58 0.64 0.66

Maroon Bells-Snowmass Wilderness 0.17 0.19 0.09 0.15 0.19

West Elk Wilderness 0.52 0.40 0.19 0.37 0.52

Weminuche Wilderness 0.64 0.88 0.55 0.69 0.88

Wheeler Peak Wilderness 0.29 0.30 0.25 0.28 0.30

Sum 10.25 8.21 6.68 8.38 11.24

Table G-4. Unit 4 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.16 0.30 0.39 0.62 1.16

Bandelier Wilderness 0.42 0.40 0.30 0.37 0.42

Black Canyon of the Gunnison 

Wilderness 0.40 0.43 0.20 0.34 0.43

Canyonlands 1.35 0.68 0.68 0.90 1.35

Capitol Reef 0.68 0.14 0.21 0.34 0.68

La Garita Wilderness 0.44 0.57 0.34 0.45 0.57

Grand Canyon 0.29 0.08 0.17 0.18 0.29

Great Sand Dunes National Monument 0.28 0.54 0.34 0.39 0.54

Mesa Verde 1.86 1.92 1.87 1.88 1.92

Pecos Wilderness 0.26 0.40 0.29 0.31 0.40

Petrified Forest 0.16 0.14 0.11 0.14 0.16

San Pedro Parks Wilderness 0.65 0.61 0.67 0.64 0.67

Maroon Bells-Snowmass Wilderness 0.20 0.18 0.09 0.16 0.20

West Elk Wilderness 0.44 0.40 0.19 0.34 0.44

Weminuche Wilderness 0.63 0.86 0.65 0.71 0.86

Wheeler Peak Wilderness 0.33 0.29 0.25 0.29 0.33

Sum 9.52 7.94 6.74 8.07 10.39
Table G-5. Facility EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 3.32 0.96 1.49 1.92 3.32

Bandelier Wilderness 1.34 1.26 0.93 1.18 1.34

Black Canyon of the Gunnison 

Wilderness 1.31 1.35 0.60 1.09 1.35

Canyonlands 4.15 1.95 1.97 2.69 4.15

Capitol Reef 2.33 0.45 0.70 1.16 2.33

La Garita Wilderness 1.37 1.77 1.07 1.41 1.77

Grand Canyon 0.94 0.30 0.39 0.54 0.94

Great Sand Dunes National Monument 0.86 1.49 1.09 1.15 1.49

Mesa Verde 4.26 4.33 3.95 4.18 4.33

Pecos Wilderness 0.86 1.23 0.90 1.00 1.23

Petrified Forest 0.54 0.47 0.38 0.46 0.54

San Pedro Parks Wilderness 1.89 1.69 1.77 1.78 1.89

Maroon Bells-Snowmass Wilderness 0.62 0.55 0.31 0.49 0.62

West Elk Wilderness 1.37 1.20 0.59 1.05 1.37

Weminuche Wilderness 1.86 2.42 1.70 1.99 2.42

Wheeler Peak Wilderness 1.02 0.97 0.76 0.92 1.02

Sum 28.04 22.39 18.60 23.01 30.11
H. EPA modeling Results: EPA Revised Baseline with 1 ppb 

Background Ammonia and Method 8
Table H-1. Unit 1 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.83 0.22 0.32 0.46 0.83

Bandelier Wilderness 0.29 0.27 0.23 0.26 0.29

Black Canyon of the Gunnison 

Wilderness 0.29 0.27 0.22 0.26 0.29

Canyonlands 1.34 0.78 0.54 0.88 1.34

Capitol Reef 0.59 0.09 0.13 0.27 0.59

La Garita Wilderness 0.29 0.41 0.24 0.31 0.41

Grand Canyon 0.19 0.05 0.08 0.11 0.19

Great Sand Dunes National Monument 0.16 0.32 0.23 0.24 0.32

Mesa Verde 1.53 1.64 1.87 1.68 1.87

Pecos Wilderness 0.21 0.28 0.20 0.23 0.28

Petrified Forest 0.14 0.13 0.09 0.12 0.14

San Pedro Parks Wilderness 0.49 0.42 0.46 0.45 0.49

Maroon Bells-Snowmass Wilderness 0.24 0.11 0.07 0.14 0.24

West Elk Wilderness 0.31 0.28 0.13 0.24 0.31

Weminuche Wilderness 0.51 0.72 0.47 0.57 0.72

Wheeler Peak Wilderness 0.22 0.23 0.18 0.21 0.23

Sum 7.61 6.21 5.44 6.42 8.53

Table H-2. Unit 2 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.82 0.22 0.32 0.45 0.82

Bandelier Wilderness 0.29 0.34 0.37 0.33 0.37

Black Canyon of the Gunnison 

Wilderness 0.29 0.31 0.13 0.24 0.31

Canyonlands 1.13 0.50 0.54 0.72 1.13

Capitol Reef 0.59 0.09 0.13 0.27 0.59

La Garita Wilderness 0.30 0.55 0.24 0.36 0.55

Grand Canyon 0.23 0.05 0.08 0.12 0.23

Great Sand Dunes National Monument 0.18 0.46 0.22 0.29 0.46

Mesa Verde 1.52 1.63 1.87 1.67 1.87

Pecos Wilderness 0.20 0.28 0.20 0.23 0.28

Petrified Forest 0.12 0.09 0.08 0.10 0.12

San Pedro Parks Wilderness 0.49 0.41 0.46 0.45 0.49

Maroon Bells-Snowmass Wilderness 0.14 0.11 0.09 0.11 0.14

West Elk Wilderness 0.31 0.28 0.13 0.24 0.31

Weminuche Wilderness 0.51 0.72 0.47 0.56 0.72

Wheeler Peak Wilderness 0.22 0.23 0.18 0.21 0.23

Sum 7.33 6.26 5.48 6.36 8.61
Table H-3. Unit 3 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.21 0.31 0.49 0.67 1.21

Bandelier Wilderness 0.46 0.53 0.33 0.44 0.53

Black Canyon of the Gunnison 

Wilderness 0.43 0.45 0.21 0.36 0.45

Canyonlands 1.69 0.71 0.77 1.06 1.69

Capitol Reef 0.72 0.14 0.21 0.36 0.72

La Garita Wilderness 0.45 0.86 0.36 0.56 0.86

Grand Canyon 0.29 0.08 0.12 0.16 0.29

Great Sand Dunes National Monument 0.27 0.66 0.34 0.42 0.66

Mesa Verde 2.41 2.34 2.25 2.33 2.41

Pecos Wilderness 0.30 0.42 0.33 0.35 0.42

Petrified Forest 0.17 0.15 0.12 0.14 0.17

San Pedro Parks Wilderness 0.77 0.66 0.70 0.71 0.77

Maroon Bells-Snowmass Wilderness 0.22 0.20 0.10 0.17 0.22

West Elk Wilderness 0.56 0.48 0.22 0.42 0.56

Weminuche Wilderness 0.65 1.07 0.69 0.80 1.07

Wheeler Peak Wilderness 0.35 0.34 0.28 0.32 0.35

Sum 10.94 9.40 7.50 9.28 12.37

Table H-4. Unit 4 EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.19 0.59 0.48 0.75 1.19

Bandelier Wilderness 0.45 0.41 0.32 0.40 0.45

Black Canyon of the Gunnison 

Wilderness 0.44 0.44 0.23 0.37 0.44

Canyonlands 2.07 0.69 0.76 1.17 2.07

Capitol Reef 0.72 0.14 0.20 0.35 0.72

La Garita Wilderness 0.44 0.61 0.36 0.47 0.61

Grand Canyon 0.29 0.09 0.17 0.19 0.29

Great Sand Dunes National Monument 0.26 0.65 0.33 0.41 0.65

Mesa Verde 2.40 2.29 2.26 2.32 2.40

Pecos Wilderness 0.32 0.41 0.32 0.35 0.41

Petrified Forest 0.17 0.19 0.11 0.16 0.19

San Pedro Parks Wilderness 0.76 0.65 0.74 0.71 0.76

Maroon Bells-Snowmass Wilderness 0.23 0.20 0.10 0.17 0.23

West Elk Wilderness 0.51 0.46 0.21 0.40 0.51

Weminuche Wilderness 0.72 1.05 0.71 0.83 1.05

Wheeler Peak Wilderness 0.36 0.32 0.28 0.32 0.36

Sum 11.31 9.19 7.59 9.36 12.31
Table H-5. Facility EPA Revised Baseline Modeling Results (1 ppb Background 

Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 3.50 0.96 1.52 1.99 3.50

Bandelier Wilderness 1.39 1.29 1.02 1.23 1.39

Black Canyon of the Gunnison 

Wilderness 1.36 1.41 0.63 1.13 1.41

Canyonlands 4.64 2.12 2.26 3.01 4.64

Capitol Reef 2.38 0.46 0.65 1.17 2.38

La Garita Wilderness 1.39 1.93 1.14 1.48 1.93

Grand Canyon 0.93 0.26 0.38 0.52 0.93

Great Sand Dunes National Monument 0.85 1.53 1.08 1.15 1.53

Mesa Verde 5.10 5.15 5.01 5.09 5.15

Pecos Wilderness 0.93 1.27 1.03 1.08 1.27

Petrified Forest 0.52 0.46 0.38 0.45 0.52

San Pedro Parks Wilderness 2.20 1.97 2.08 2.08 2.20

Maroon Bells-Snowmass Wilderness 0.70 0.60 0.34 0.55 0.70

West Elk Wilderness 1.59 1.42 0.68 1.23 1.59

Weminuche Wilderness 2.15 2.92 2.01 2.36 2.92

Wheeler Peak Wilderness 1.12 1.09 0.90 1.04 1.12

Sum 30.75 24.85 21.09 25.56 33.18
I. EPA modeling Results: SCR with Variable Background 

Ammonia and Method 6
Table I-1. Unit 1 SCR Modeling Results (Variable Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.22 0.11 0.08 0.14 0.22

Bandelier Wilderness 0.09 0.10 0.08 0.09 0.10

Black Canyon of the Gunnison 

Wilderness 0.08 0.08 0.05 0.07 0.08

Canyonlands 0.27 0.16 0.14 0.19 0.27

Capitol Reef 0.17 0.06 0.08 0.10 0.17

La Garita Wilderness 0.09 0.12 0.07 0.09 0.12

Grand Canyon 0.06 0.03 0.04 0.05 0.06

Great Sand Dunes National Monument 0.07 0.10 0.07 0.08 0.10

Mesa Verde 0.38 0.39 0.43 0.40 0.43

Pecos Wilderness 0.07 0.09 0.06 0.07 0.09

Petrified Forest 0.04 0.03 0.05 0.04 0.05

San Pedro Parks Wilderness 0.12 0.13 0.11 0.12 0.13

Maroon Bells-Snowmass Wilderness 0.05 0.04 0.02 0.04 0.05

West Elk Wilderness 0.08 0.07 0.04 0.06 0.08

Weminuche Wilderness 0.15 0.16 0.14 0.15 0.16

Wheeler Peak Wilderness 0.08 0.08 0.06 0.07 0.08

Sum 2.03 1.74 1.51 1.76 2.20

Table I-2. Unit 2 SCR Modeling Results (Variable Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.22 0.11 0.08 0.14 0.22

Bandelier Wilderness 0.09 0.10 0.08 0.09 0.10

Black Canyon of the Gunnison 

Wilderness 0.08 0.08 0.05 0.07 0.08

Canyonlands 0.27 0.16 0.14 0.19 0.27

Capitol Reef 0.17 0.06 0.08 0.10 0.17

La Garita Wilderness 0.09 0.12 0.07 0.09 0.12

Grand Canyon 0.06 0.03 0.04 0.05 0.06

Great Sand Dunes National Monument 0.07 0.10 0.07 0.08 0.10

Mesa Verde 0.38 0.39 0.43 0.40 0.43

Pecos Wilderness 0.07 0.09 0.06 0.07 0.09

Petrified Forest 0.04 0.03 0.05 0.04 0.05

San Pedro Parks Wilderness 0.12 0.13 0.11 0.12 0.13

Maroon Bells-Snowmass Wilderness 0.05 0.04 0.02 0.04 0.05

West Elk Wilderness 0.08 0.07 0.04 0.06 0.08

Weminuche Wilderness 0.14 0.16 0.14 0.15 0.16

Wheeler Peak Wilderness 0.08 0.08 0.06 0.07 0.08

Sum 2.02 1.73 1.50 1.75 2.19
Table I-3. Unit 3 SCR Modeling Results (Variable Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.32 0.16 0.12 0.20 0.32

Bandelier Wilderness 0.15 0.15 0.12 0.14 0.15

Black Canyon of the Gunnison 

Wilderness 0.12 0.13 0.08 0.11 0.13

Canyonlands 0.40 0.22 0.20 0.27 0.40

Capitol Reef 0.22 0.08 0.10 0.13 0.22

La Garita Wilderness 0.14 0.17 0.11 0.14 0.17

Grand Canyon 0.09 0.05 0.06 0.07 0.09

Great Sand Dunes National Monument 0.11 0.15 0.11 0.12 0.15

Mesa Verde 0.53 0.56 0.61 0.57 0.61

Pecos Wilderness 0.11 0.13 0.09 0.11 0.13

Petrified Forest 0.06 0.04 0.07 0.06 0.07

San Pedro Parks Wilderness 0.19 0.21 0.17 0.19 0.21

Maroon Bells-Snowmass Wilderness 0.08 0.06 0.04 0.06 0.08

West Elk Wilderness 0.13 0.11 0.06 0.10 0.13

Weminuche Wilderness 0.21 0.24 0.18 0.21 0.24

Wheeler Peak Wilderness 0.13 0.13 0.08 0.11 0.13

Sum 2.98 2.58 2.18 2.58 3.22

Table I-4. Unit 4 SCR Modeling Results (Variable Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.32 0.16 0.12 0.20 0.32

Bandelier Wilderness 0.14 0.15 0.12 0.14 0.15

Black Canyon of the Gunnison 

Wilderness 0.12 0.13 0.08 0.11 0.13

Canyonlands 0.39 0.22 0.19 0.27 0.39

Capitol Reef 0.22 0.08 0.10 0.13 0.22

La Garita Wilderness 0.13 0.17 0.10 0.13 0.17

Grand Canyon 0.09 0.04 0.06 0.07 0.09

Great Sand Dunes National Monument 0.11 0.15 0.10 0.12 0.15

Mesa Verde 0.53 0.56 0.60 0.56 0.60

Pecos Wilderness 0.10 0.13 0.08 0.11 0.13

Petrified Forest 0.06 0.04 0.07 0.06 0.07

San Pedro Parks Wilderness 0.18 0.20 0.16 0.18 0.20

Maroon Bells-Snowmass Wilderness 0.08 0.06 0.04 0.06 0.08

West Elk Wilderness 0.13 0.11 0.07 0.10 0.13

Weminuche Wilderness 0.21 0.23 0.18 0.21 0.23

Wheeler Peak Wilderness 0.12 0.13 0.08 0.11 0.13

Sum 2.93 2.54 2.15 2.54 3.17
Table I-5. Facility SCR Modeling Results (Variable Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.01 0.53 0.40 0.65 1.01

Bandelier Wilderness 0.46 0.46 0.39 0.44 0.46

Black Canyon of the Gunnison 

Wilderness 0.40 0.39 0.27 0.35 0.40

Canyonlands 1.22 0.70 0.62 0.85 1.22

Capitol Reef 0.76 0.27 0.32 0.45 0.76

La Garita Wilderness 0.44 0.56 0.34 0.45 0.56

Grand Canyon 0.31 0.14 0.21 0.22 0.31

Great Sand Dunes National Monument 0.36 0.49 0.34 0.39 0.49

Mesa Verde 1.56 1.59 1.54 1.56 1.59

Pecos Wilderness 0.34 0.42 0.27 0.34 0.42

Petrified Forest 0.21 0.14 0.23 0.19 0.23

San Pedro Parks Wilderness 0.59 0.60 0.57 0.59 0.60

Maroon Bells-Snowmass Wilderness 0.26 0.18 0.12 0.19 0.26

West Elk Wilderness 0.42 0.34 0.19 0.32 0.42

Weminuche Wilderness 0.70 0.75 0.59 0.68 0.75

Wheeler Peak Wilderness 0.40 0.42 0.26 0.36 0.42

Sum 9.44 7.96 6.64 8.02 9.90
J. EPA modeling Results: SCR with Variable Background Ammonia 

and Method 8
Table J-1. Unit 1 SCR Modeling Results (Variable Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.21 0.10 0.08 0.13 0.21

Bandelier Wilderness 0.09 0.09 0.08 0.08 0.09

Black Canyon of the Gunnison 

Wilderness 0.08 0.08 0.05 0.07 0.08

Canyonlands 0.28 0.13 0.14 0.18 0.28

Capitol Reef 0.17 0.05 0.07 0.10 0.17

La Garita Wilderness 0.09 0.11 0.07 0.09 0.11

Grand Canyon 0.06 0.03 0.04 0.04 0.06

Great Sand Dunes National Monument 0.06 0.09 0.07 0.07 0.09

Mesa Verde 0.45 0.43 0.49 0.46 0.49

Pecos Wilderness 0.07 0.09 0.06 0.07 0.09

Petrified Forest 0.04 0.03 0.04 0.04 0.04

San Pedro Parks Wilderness 0.14 0.14 0.13 0.14 0.14

Maroon Bells-Snowmass Wilderness 0.05 0.04 0.02 0.04 0.05

West Elk Wilderness 0.09 0.07 0.05 0.07 0.09

Weminuche Wilderness 0.16 0.19 0.15 0.16 0.19

Wheeler Peak Wilderness 0.08 0.09 0.06 0.08 0.09

Sum 2.12 1.75 1.58 1.82 2.27

Table J-2. Unit 2 SCR Modeling Results (Variable Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.21 0.10 0.08 0.13 0.21

Bandelier Wilderness 0.13 0.09 0.08 0.10 0.13

Black Canyon of the Gunnison 

Wilderness 0.08 0.08 0.05 0.07 0.08

Canyonlands 0.28 0.13 0.14 0.18 0.28

Capitol Reef 0.16 0.05 0.07 0.10 0.16

La Garita Wilderness 0.09 0.11 0.07 0.09 0.11

Grand Canyon 0.06 0.03 0.04 0.04 0.06

Great Sand Dunes National Monument 0.06 0.12 0.07 0.08 0.12

Mesa Verde 0.45 0.43 0.48 0.45 0.48

Pecos Wilderness 0.07 0.09 0.06 0.07 0.09

Petrified Forest 0.04 0.03 0.04 0.04 0.04

San Pedro Parks Wilderness 0.17 0.14 0.13 0.15 0.17

Maroon Bells-Snowmass Wilderness 0.05 0.04 0.02 0.04 0.05

West Elk Wilderness 0.09 0.07 0.05 0.07 0.09

Weminuche Wilderness 0.16 0.19 0.15 0.16 0.19

Wheeler Peak Wilderness 0.08 0.09 0.06 0.08 0.09

Sum 2.19 1.78 1.58 3.36 2.35
Table J-3. Unit 3 SCR Modeling Results (Variable Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.31 0.14 0.12 0.19 0.31

Bandelier Wilderness 0.14 0.14 0.11 0.13 0.14

Black Canyon of the Gunnison 

Wilderness 0.11 0.12 0.08 0.10 0.12

Canyonlands 0.40 0.19 0.19 0.26 0.40

Capitol Reef 0.22 0.07 0.09 0.13 0.22

La Garita Wilderness 0.13 0.17 0.10 0.14 0.17

Grand Canyon 0.09 0.04 0.06 0.06 0.09

Great Sand Dunes National Monument 0.10 0.14 0.10 0.11 0.14

Mesa Verde 0.62 0.65 0.67 0.65 0.67

Pecos Wilderness 0.11 0.13 0.09 0.11 0.13

Petrified Forest 0.06 0.04 0.06 0.06 0.06

San Pedro Parks Wilderness 0.21 0.23 0.19 0.21 0.23

Maroon Bells-Snowmass Wilderness 0.08 0.06 0.04 0.06 0.08

West Elk Wilderness 0.14 0.12 0.07 0.11 0.14

Weminuche Wilderness 0.23 0.28 0.20 0.24 0.28

Wheeler Peak Wilderness 0.13 0.13 0.09 0.12 0.13

Sum 3.08 2.66 2.26 2.66 3.32

Table J-4. Unit 4 SCR Modeling Results (Variable Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.31 0.14 0.12 0.19 0.31

Bandelier Wilderness 0.14 0.13 0.11 0.13 0.14

Black Canyon of the Gunnison 

Wilderness 0.11 0.12 0.07 0.10 0.12

Canyonlands 0.39 0.19 0.19 0.26 0.39

Capitol Reef 0.22 0.07 0.09 0.13 0.22

La Garita Wilderness 0.13 0.17 0.10 0.13 0.17

Grand Canyon 0.09 0.04 0.06 0.06 0.09

Great Sand Dunes National Monument 0.10 0.14 0.10 0.11 0.14

Mesa Verde 0.62 0.67 0.66 0.65 0.67

Pecos Wilderness 0.10 0.13 0.09 0.11 0.13

Petrified Forest 0.06 0.04 0.06 0.06 0.06

San Pedro Parks Wilderness 0.20 0.22 0.19 0.21 0.22

Maroon Bells-Snowmass Wilderness 0.08 0.06 0.04 0.06 0.08

West Elk Wilderness 0.14 0.12 0.07 0.11 0.14

Weminuche Wilderness 0.23 0.27 0.20 0.23 0.27

Wheeler Peak Wilderness 0.13 0.13 0.09 0.12 0.13

Sum 3.03 2.65 2.22 2.63 3.27
Table J-5. Facility SCR Modeling Results (Variable Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.97 0.47 0.39 0.61 0.97

Bandelier Wilderness 0.45 0.43 0.36 0.41 0.45

Black Canyon of the Gunnison 

Wilderness 0.38 0.39 0.25 0.34 0.39

Canyonlands 1.20 0.62 0.62 0.81 1.20

Capitol Reef 0.74 0.24 0.29 0.42 0.74

La Garita Wilderness 0.44 0.55 0.34 0.44 0.55

Grand Canyon 0.29 0.13 0.19 0.20 0.29

Great Sand Dunes National Monument 0.32 0.45 0.32 0.36 0.45

Mesa Verde 1.74 1.77 1.69 1.73 1.77

Pecos Wilderness 0.34 0.43 0.28 0.35 0.43

Petrified Forest 0.20 0.14 0.21 0.18 0.21

San Pedro Parks Wilderness 0.66 0.66 0.61 0.64 0.66

Maroon Bells-Snowmass Wilderness 0.27 0.18 0.12 0.19 0.27

West Elk Wilderness 0.44 0.37 0.21 0.34 0.44

Weminuche Wilderness 0.76 0.82 0.69 0.76 0.82

Wheeler Peak Wilderness 0.41 0.43 0.30 0.38 0.43

Sum 9.60 8.08 6.86 8.18 10.07
K. EPA modeling Results: SCR with 1 ppb Background Ammonia 

and Method 6
Table K-1. Unit 1 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.25 0.11 0.09 0.15 0.25

Bandelier Wilderness 0.09 0.10 0.08 0.09 0.10

Black Canyon of the Gunnison 

Wilderness 0.09 0.09 0.06 0.08 0.09

Canyonlands 0.31 0.16 0.14 0.21 0.31

Capitol Reef 0.17 0.06 0.08 0.10 0.17

La Garita Wilderness 0.10 0.12 0.07 0.10 0.12

Grand Canyon 0.07 0.03 0.04 0.05 0.07

Great Sand Dunes National Monument 0.07 0.11 0.08 0.09 0.11

Mesa Verde 0.40 0.42 0.44 0.42 0.44

Pecos Wilderness 0.08 0.09 0.06 0.08 0.09

Petrified Forest 0.04 0.03 0.05 0.04 0.05

San Pedro Parks Wilderness 0.13 0.13 0.13 0.13 0.13

Maroon Bells-Snowmass Wilderness 0.05 0.04 0.02 0.04 0.05

West Elk Wilderness 0.09 0.07 0.05 0.07 0.09

Weminuche Wilderness 0.15 0.16 0.14 0.15 0.16

Wheeler Peak Wilderness 0.08 0.09 0.06 0.08 0.09

Sum 2.17 1.80 1.61 1.86 2.33

Table K-2. Unit 2 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.25 0.11 0.09 0.15 0.25

Bandelier Wilderness 0.09 0.10 0.08 0.09 0.10

Black Canyon of the Gunnison 

Wilderness 0.09 0.09 0.06 0.08 0.09

Canyonlands 0.28 0.16 0.14 0.20 0.28

Capitol Reef 0.17 0.06 0.08 0.10 0.17

La Garita Wilderness 0.10 0.12 0.07 0.10 0.12

Grand Canyon 0.07 0.03 0.04 0.05 0.07

Great Sand Dunes National Monument 0.07 0.11 0.08 0.09 0.11

Mesa Verde 0.40 0.41 0.44 0.42 0.44

Pecos Wilderness 0.08 0.09 0.06 0.08 0.09

Petrified Forest 0.04 0.03 0.05 0.04 0.05

San Pedro Parks Wilderness 0.13 0.13 0.13 0.13 0.13

Maroon Bells-Snowmass Wilderness 0.05 0.04 0.02 0.04 0.05

West Elk Wilderness 0.09 0.07 0.05 0.07 0.09

Weminuche Wilderness 0.15 0.16 0.14 0.15 0.16

Wheeler Peak Wilderness 0.08 0.09 0.06 0.08 0.09

Sum 2.13 1.80 1.60 1.84 2.29
Table K-3. Unit 3 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.35 0.16 0.14 0.22 0.35

Bandelier Wilderness 0.15 0.16 0.13 0.15 0.16

Black Canyon of the Gunnison 

Wilderness 0.13 0.13 0.08 0.11 0.13

Canyonlands 0.45 0.25 0.22 0.30 0.45

Capitol Reef 0.24 0.08 0.10 0.14 0.24

La Garita Wilderness 0.15 0.17 0.11 0.14 0.17

Grand Canyon 0.10 0.05 0.07 0.07 0.10

Great Sand Dunes National Monument 0.11 0.16 0.11 0.13 0.16

Mesa Verde 0.61 0.60 0.63 0.61 0.63

Pecos Wilderness 0.11 0.15 0.10 0.12 0.15

Petrified Forest 0.06 0.05 0.07 0.06 0.07

San Pedro Parks Wilderness 0.20 0.21 0.20 0.20 0.21

Maroon Bells-Snowmass Wilderness 0.08 0.06 0.04 0.06 0.08

West Elk Wilderness 0.14 0.11 0.07 0.11 0.14

Weminuche Wilderness 0.23 0.25 0.19 0.22 0.25

Wheeler Peak Wilderness 0.13 0.13 0.09 0.12 0.13

Sum 3.22 2.73 2.35 2.77 3.42

Table K-4. Unit 4 SCR Modeling Results (1 ppb Background Ammonia and Method 6)

Class I Area

98th Percentile for Each

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.35 0.16 0.14 0.22 0.35

Bandelier Wilderness 0.15 0.15 0.13 0.15 0.15

Black Canyon of the Gunnison 

Wilderness 0.12 0.13 0.08 0.11 0.13

Canyonlands 0.44 0.24 0.22 0.30 0.44

Capitol Reef 0.23 0.08 0.10 0.14 0.23

La Garita Wilderness 0.15 0.17 0.11 0.14 0.17

Grand Canyon 0.10 0.05 0.06 0.07 0.10

Great Sand Dunes National Monument 0.11 0.16 0.11 0.13 0.16

Mesa Verde 0.60 0.62 0.63 0.62 0.63

Pecos Wilderness 0.11 0.15 0.09 0.12 0.15

Petrified Forest 0.06 0.05 0.07 0.06 0.07

San Pedro Parks Wilderness 0.19 0.21 0.19 0.20 0.21

Maroon Bells-Snowmass Wilderness 0.08 0.06 0.04 0.06 0.08

West Elk Wilderness 0.13 0.11 0.07 0.10 0.13

Weminuche Wilderness 0.22 0.25 0.19 0.22 0.25

Wheeler Peak Wilderness 0.13 0.13 0.09 0.11 0.13

Sum 3.18 2.70 2.31 2.73 3.38
Table K-5. Facility SCR Modeling Results (1 ppb Background Ammonia and Method 6)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.14 0.53 0.47 0.71 1.14

Bandelier Wilderness 0.49 0.50 0.40 0.46 0.50

Black Canyon of the Gunnison 

Wilderness 0.43 0.41 0.27 0.37 0.43

Canyonlands 1.44 0.79 0.71 0.98 1.44

Capitol Reef 0.83 0.27 0.32 0.47 0.83

La Garita Wilderness 0.50 0.56 0.36 0.47 0.56

Grand Canyon 0.34 0.15 0.21 0.24 0.34

Great Sand Dunes National Monument 0.36 0.53 0.37 0.42 0.53

Mesa Verde 1.84 1.83 2.02 1.90 2.02

Pecos Wilderness 0.38 0.48 0.31 0.39 0.48

Petrified Forest 0.21 0.16 0.23 0.20 0.23

San Pedro Parks Wilderness 0.62 0.67 0.63 0.64 0.67

Maroon Bells-Snowmass Wilderness 0.26 0.18 0.13 0.19 0.26

West Elk Wilderness 0.44 0.34 0.22 0.33 0.44

Weminuche Wilderness 0.74 0.75 0.66 0.72 0.75

Wheeler Peak Wilderness 0.41 0.43 0.29 0.38 0.43

Sum 10.43 8.58 7.58 8.86 11.05
L. EPA modeling Results: SCR with 1 ppb Background Ammonia 

and Method 8
Table L-1. Unit 1 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.24 0.10 0.09 0.14 0.24

Bandelier Wilderness 0.09 0.10 0.09 0.09 0.10

Black Canyon of the Gunnison 

Wilderness 0.09 0.09 0.06 0.08 0.09

Canyonlands 0.38 0.15 0.15 0.23 0.38

Capitol Reef 0.17 0.05 0.08 0.10 0.17

La Garita Wilderness 0.10 0.11 0.07 0.10 0.11

Grand Canyon 0.07 0.03 0.04 0.04 0.07

Great Sand Dunes National Monument 0.06 0.10 0.07 0.08 0.10

Mesa Verde 0.47 0.46 0.52 0.48 0.52

Pecos Wilderness 0.08 0.09 0.07 0.08 0.09

Petrified Forest 0.04 0.03 0.04 0.04 0.04

San Pedro Parks Wilderness 0.14 0.15 0.13 0.14 0.15

Maroon Bells-Snowmass Wilderness 0.06 0.04 0.02 0.04 0.06

West Elk Wilderness 0.09 0.07 0.05 0.07 0.09

Weminuche Wilderness 0.17 0.19 0.15 0.17 0.19

Wheeler Peak Wilderness 0.08 0.09 0.06 0.08 0.09

Sum 2.32 1.85 1.70 1.95 2.49

Table L-2. Unit 2 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.24 0.10 0.09 0.14 0.24

Bandelier Wilderness 0.09 0.09 0.09 0.09 0.09

Black Canyon of the Gunnison 

Wilderness 0.09 0.08 0.06 0.08 0.09

Canyonlands 0.38 0.15 0.15 0.23 0.38

Capitol Reef 0.17 0.05 0.08 0.10 0.17

La Garita Wilderness 0.10 0.11 0.07 0.09 0.11

Grand Canyon 0.07 0.03 0.04 0.04 0.07

Great Sand Dunes National Monument 0.06 0.10 0.07 0.08 0.10

Mesa Verde 0.47 0.46 0.51 0.48 0.51

Pecos Wilderness 0.08 0.09 0.07 0.08 0.09

Petrified Forest 0.04 0.03 0.04 0.04 0.04

San Pedro Parks Wilderness 0.14 0.15 0.13 0.14 0.15

Maroon Bells-Snowmass Wilderness 0.06 0.04 0.02 0.04 0.06

West Elk Wilderness 0.09 0.07 0.05 0.07 0.09

Weminuche Wilderness 0.17 0.19 0.15 0.17 0.19

Wheeler Peak Wilderness 0.08 0.09 0.06 0.08 0.09

Sum 2.31 1.84 1.69 1.95 2.47
Table L-3. Unit 3 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.35 0.14 0.14 0.21 0.35

Bandelier Wilderness 0.15 0.15 0.13 0.14 0.15

Black Canyon of the Gunnison 

Wilderness 0.12 0.13 0.08 0.11 0.13

Canyonlands 0.47 0.20 0.22 0.30 0.47

Capitol Reef 0.24 0.07 0.09 0.13 0.24

La Garita Wilderness 0.15 0.18 0.11 0.15 0.18

Grand Canyon 0.10 0.04 0.06 0.06 0.10

Great Sand Dunes National Monument 0.10 0.15 0.11 0.12 0.15

Mesa Verde 0.72 0.71 0.75 0.73 0.75

Pecos Wilderness 0.12 0.15 0.10 0.12 0.15

Petrified Forest 0.06 0.05 0.06 0.06 0.06

San Pedro Parks Wilderness 0.22 0.24 0.21 0.22 0.24

Maroon Bells-Snowmass Wilderness 0.09 0.06 0.04 0.06 0.09

West Elk Wilderness 0.15 0.13 0.07 0.11 0.15

Weminuche Wilderness 0.25 0.29 0.23 0.25 0.29

Wheeler Peak Wilderness 0.13 0.14 0.10 0.12 0.14

Sum 3.39 2.81 2.49 2.90 3.62

Table L-4. Unit 4 SCR Modeling Results (1 ppb Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 0.34 0.14 0.14 0.21 0.34

Bandelier Wilderness 0.15 0.14 0.13 0.14 0.15

Black Canyon of the Gunnison 

Wilderness 0.12 0.13 0.07 0.11 0.13

Canyonlands 0.47 0.20 0.21 0.29 0.47

Capitol Reef 0.24 0.07 0.09 0.13 0.24

La Garita Wilderness 0.15 0.17 0.11 0.14 0.17

Grand Canyon 0.10 0.04 0.06 0.06 0.10

Great Sand Dunes National Monument 0.10 0.15 0.10 0.12 0.15

Mesa Verde 0.71 0.70 0.74 0.72 0.74

Pecos Wilderness 0.12 0.14 0.10 0.12 0.14

Petrified Forest 0.06 0.07 0.06 0.06 0.07

San Pedro Parks Wilderness 0.21 0.23 0.20 0.22 0.23

Maroon Bells-Snowmass Wilderness 0.09 0.06 0.04 0.06 0.09

West Elk Wilderness 0.15 0.13 0.07 0.11 0.15

Weminuche Wilderness 0.24 0.28 0.22 0.25 0.28

Wheeler Peak Wilderness 0.13 0.14 0.09 0.12 0.14

Sum 3.35 2.79 2.44 2.86 3.56
Table L-5. Facility SCR Modeling Results (1 ppb Background Ammonia and Method 8)

Class I Area

98th Percentile for Each 

Year 3 year 

average

3 year 

maximum 2001 2002 2003

Arches 1.12 0.47 0.46 0.68 1.12

Bandelier Wilderness 0.48 0.47 0.41 0.45 0.48

Black Canyon of the Gunnison 

Wilderness 0.42 0.41 0.25 0.36 0.42

Canyonlands 1.53 0.67 0.74 0.98 1.53

Capitol Reef 0.82 0.25 0.32 0.46 0.82

La Garita Wilderness 0.50 0.57 0.36 0.47 0.57

Grand Canyon 0.33 0.13 0.19 0.22 0.33

Great Sand Dunes National Monument 0.32 0.49 0.34 0.38 0.49

Mesa Verde 2.12 2.03 2.27 2.14 2.27

Pecos Wilderness 0.39 0.47 0.32 0.40 0.47

Petrified Forest 0.20 0.15 0.21 0.19 0.21

San Pedro Parks Wilderness 0.69 0.74 0.66 0.70 0.74

Maroon Bells-Snowmass Wilderness 0.28 0.18 0.13 0.20 0.28

West Elk Wilderness 0.45 0.39 0.23 0.36 0.45

Weminuche Wilderness 0.81 0.87 0.72 0.80 0.87

Wheeler Peak Wilderness 0.41 0.44 0.31 0.39 0.44

Sum 10.86 8.74 7.92 9.17 11.48