New Baseline

98th Percentile Visibility Impact above Background (∆dv)98th

Percentile Value (∆dv)Visibility

Improvement (∆dv) 98th

Percentile Value (∆dv)Visibility

Improvement (∆dv) 98th

Percentile Value (∆dv)Visibility

Improvement (∆dv)

Badlands 2001 0.824 0.659 0.165 0.631 0.193 0.578 0.246 Badlands 2002 0.585 0.490 0.095 0.462 0.123 0.419 0.166 Badlands 2003 0.773 0.659 0.1140.618 0.155 0.539 0.234 Wind Cave 2001 0.921 0.7170.2040.683 0.238 0.622 0.299 Wind Cave 2002 0.879 0.769 0.110 0.741 0.138 0.686 0.193 Wind Cave 2003 1.226 0.918 0.308 0.874 0.352 0.787 0.439 Badlands 2001 0.802 0.658 0.1440.631 0.171 0.577 0.225 Badlands 2002 0.590 0.4870.103 0.460 0.130 0.422 0.168 Badlands 2003 0.774 0.659 0.115 0.617 0.1570.538 0.236 Wind Cave 2001 0.904 0.701 0.203 0.676 0.228 0.630 0.274 Wind Cave 2002 0.875 0.763 0.112 0.736 0.139 0.683 0.192 Wind Cave 2003 1.206 0.918 0.288 0.873 0.333 0.788 0.418 Badlands 2001 0.800 0.4170.383 0.350 0.450 0.211 0.589 Badlands 2002 0.641 0.310 0.331 0.250 0.391 0.152 0.489 Badlands 2003 0.882 0.440 0.442 0.359 0.523 0.208 0.674 Wind Cave 2001 1.03 0.529 0.500 0.435 0.5940.238 0.791 Wind Cave 2002 0.84 0.448 0.395 0.370 0.473 0.230 0.613 Wind Cave 2003 1.32 0.683 0.639 0.564 0.758 0.318 1.004 Mt Zirkel 2001 0.216 0.115 0.101 0.093 0.123 0.061 0.155 Mt Zirkel 2002 0.353 0.1770.176 0.148 0.205 0.096 0.257 Mt Zirkel 2003 0.439 0.228 0.211 0.190 0.249 0.105 0.334 Rawah 2001 0.264 0.1470.1170.122 0.142 0.07 0.191 Rawah 2002 0.486 0.262 0.2240.222 0.264 0.14 0.349 Rawah 2003 0.484 0.241 0.243 0.197 0.287 0.11 0.375 RMNP 2001 0.311 0.166 0.145 0.139 0.172 0.09 0.224 RMNP 2002 0.475 0.230 0.245 0.189 0.286 0.09 0.381 RMNP 2003 0.688 0.346 0.342 0.281 0.407 0.15 0.539 Badlands 2001 0.995 0.456 0.539 0.456 0.539 0.320 0.675 Badlands 2002 0.762 0.365 0.3970.332 0.430 0.222 0.540 Badlands 2003 1.049 0.556 0.493 0.479 0.570 0.322 0.727 Mt Zirkel 2001 0.242 0.1240.118 0.123 0.119 0.122 0.120 Mt Zirkel 2002 0.424 0.216 0.208 0.189 0.235 0.165 0.259 Mt Zirkel 2003 0.557 0.279 0.278 0.238 0.319 0.192 0.365 Rawah 2001 0.332 0.163 0.169 0.139 0.193 0.100 0.232 Rawah 2002 0.586 0.316 0.270 0.282 0.3040.208 0.378 Rawah 2003 0.557 0.270 0.2870.235 0.322 0.169 0.388 RMNP 2001 0.373 0.186 0.1870.166 0.2070.122 0.251 RMNP 2002 0.515 0.2640.251 0.236 0.279 0.149 0.366 RMNP 2003 0.869 0.421 0.448 0.364 0.505 0.239 0.630 Wind Cave 2001 1.164 0.469 0.695 0.468 0.696 0.349 0.815 Wind Cave 2002 1.079 0.533 0.546 0.465 0.6140.342 0.737 Wind Cave 2003 1.691 0.853 0.838 0.745 0.946 0.478 1.213 Bridger 2001 1.634 0.799 0.835 0.649 0.985 0.404 1.230 Bridger 2002 1.350 0.675 0.675 0.557 0.793 0.368 0.982 Bridger 2003 1.490 0.756 0.7340.624 0.866 0.411 1.079 Fitzpatrick 2001 0.732 0.349 0.383 0.283 0.449 0.174 0.558 Fitzpatrick 2002 0.481 0.239 0.242 0.198 0.283 0.131 0.350 Fitzpatrick 2003 0.609 0.3040.305 0.248 0.361 0.155 0.454 N. Absaroka 2001 0.266 0.129 0.1370.109 0.1570.073 0.193 N. Absaroka 2002 0.279 0.141 0.138 0.120 0.159 0.083 0.196 N. Absaroka 2003 0.158 0.079 0.079 0.068 0.090 0.048 0.110 Washakie 2001 0.327 0.166 0.161 0.138 0.189 0.090 0.237 Washakie 2002 0.402 0.205 0.1970.172 0.230 0.112 0.290 Washakie 2003 0.291 0.145 0.146 0.119 0.172 0.083 0.208 Teton 2001 0.408 0.208 0.200 0.168 0.240 0.113 0.295 Teton 2002 0.477 0.229 0.248 0.186 0.291 0.121 0.356 Teton 2003 0.331 0.160 0.171 0.132 0.199 0.088 0.243 Grand Teton 2001 0.480 0.230 0.250 0.188 0.292 0.124 0.356 Grand Teton 2002 0.665 0.332 0.333 0.274 0.391 0.177 0.488 Grand Teton 2003 0.331 0.161 0.170 0.131 0.200 0.098 0.233 Yellowstone 2001 0.392 0.198 0.1940.165 0.2270.108 0.284 Yellowstone 2002 0.544 0.2670.2770.219 0.325 0.137 0.407 Yellowstone 2003 0.339 0.165 0.1740.136 0.203 0.089 0.250 Bridger 2001 1.952 0.983 0.969 0.804 1.148 0.531 1.421 Bridger 2002 1.575 0.7870.788 0.653 0.922 0.441 1.134 Bridger 2003 1.859 0.956 0.903 0.796 1.063 0.543 1.316 Fitzpatrick 2001 0.853 0.422 0.431 0.344 0.509 0.216 0.637 Fitzpatrick 2002 0.619 0.299 0.320 0.249 0.370 0.163 0.456 Fitzpatrick 2003 0.709 0.340 0.369 0.276 0.433 0.181 0.528 N. Absaroka 2001 0.347 0.1670.180 0.137 0.210 0.092 0.255 N. Absaroka 2002 0.344 0.185 0.159 0.158 0.186 0.112 0.232 N. Absaroka 2003 0.193 0.0970.096 0.082 0.111 0.062 0.131 Washakie 2001 0.427 0.2170.210 0.175 0.252 0.124 0.303 Washakie 2002 0.484 0.2470.2370.208 0.276 0.141 0.343 Washakie 2003 0.350 0.1740.176 0.145 0.205 0.101 0.249 Teton 2001 0.511 0.261 0.250 0.215 0.296 0.146 0.365 Teton 2002 0.609 0.2940.315 0.241 0.368 0.161 0.448 Teton 2003 0.406 0.202 0.2040.169 0.2370.108 0.298 Grand Teton 2001 0.603 0.295 0.308 0.243 0.360 0.156 0.447 Grand Teton 2002 0.932 0.458 0.4740.375 0.5570.234 0.698 Grand Teton 2003 0.421 0.208 0.213 0.171 0.250 0.121 0.300 Yellowstone 2001 0.518 0.262 0.256 0.219 0.299 0.146 0.372 Yellowstone 2002 0.536 0.285 0.251 0.244 0.292 0.176 0.360 Yellowstone 2003 0.354 0.172 0.182 0.142 0.212 0.095 0.259 Scenario 3

Unit

Unit 2

PacifiCorp - Dave Johnston Unit 3

Unit 4 Location

Unit 1Class I Area by Year Scenario 1 Scenario 2

Unit 1

PacifiCorp – Naughton Unit 2New Baseline

98th Percentile Visibility Impact above Background (∆dv)98th

Percentile Value (∆dv)Visibility

Improvement (∆dv) 98th

Percentile Value (∆dv)Visibility

Improvement (∆dv) 98th

Percentile Value (∆dv)Visibility

Improvement (∆dv) Scenario 3

Unit

PacifiCorp - Dave Johnston Location

Unit 1Class I Area by Year Scenario 1 Scenario 2

Bridger 2001 2.222 2.051 0.171 1.559 0.663 0.761 1.461 Bridger 2002 1.838 1.695 0.143 1.291 0.5470.694 1.144 Bridger 2003 2.391 2.220 0.171 1.693 0.698 0.878 1.513 Fitzpatrick 2001 1.144 1.0570.0870.816 0.328 0.400 0.744 Fitzpatrick 2002 0.896 0.822 0.0740.623 0.273 0.305 0.591 Fitzpatrick 2003 0.881 0.810 0.071 0.612 0.269 0.279 0.602 N. Absaroka 2001 0.542 0.499 0.043 0.380 0.162 0.188 0.354 N. Absaroka 2002 0.583 0.541 0.042 0.423 0.160 0.221 0.362 N. Absaroka 2003 0.288 0.266 0.022 0.205 0.083 0.115 0.173 Washakie 2001 0.808 0.746 0.062 0.575 0.233 0.291 0.517 Washakie 2002 0.775 0.712 0.063 0.542 0.233 0.267 0.508 Washakie 2003 0.589 0.541 0.048 0.405 0.1840.197 0.392 Teton 2001 0.858 0.789 0.069 0.603 0.255 0.304 0.554 Teton 2002 0.962 0.8840.078 0.665 0.2970.307 0.655 Teton 2003 0.609 0.560 0.049 0.426 0.183 0.206 0.403 Grand Teton 2001 1.009 0.932 0.0770.723 0.286 0.362 0.647 Grand Teton 2002 1.090 1.003 0.0870.757 0.333 0.360 0.730 Grand Teton 2003 0.800 0.7340.066 0.547 0.253 0.266 0.534 Yellowstone 2001 0.834 0.768 0.066 0.583 0.251 0.282 0.552 Yellowstone 2002 0.860 0.791 0.069 0.600 0.260 0.292 0.568 Yellowstone 2003 0.451 0.416 0.035 0.319 0.132 0.154 0.297 Badlands 2001 0.579 0.455 0.1240.389 0.190 0.243 0.336 Badlands 2002 0.746 0.613 0.133 0.539 0.2070.299 0.447 Badlands 2003 0.706 0.536 0.170 0.479 0.2270.285 0.421 Wind Cave 2001 0.840 0.648 0.192 0.558 0.282 0.322 0.518 Wind Cave 2002 0.958 0.751 0.2070.637 0.321 0.365 0.593 Wind Cave 2003 1.138 0.896 0.242 0.762 0.376 0.431 0.707 Badlands 2001 1.278 0.993 0.285 0.840 0.438 0.489 0.789 Badlands 2002 0.738 0.582 0.156 0.504 0.2340.297 0.441 Badlands 2003 1.051 0.820 0.231 0.684 0.3670.327 0.724 Wind Cave 2001 1.038 0.838 0.200 0.721 0.3170.399 0.639 Wind Cave 2002 1.077 0.888 0.189 0.778 0.299 0.486 0.591 Wind Cave 2003 0.788 0.618 0.170 0.531 0.2570.331 0.457 Rawah 2001 0.322 0.269 0.053 0.231 0.091 0.125 0.197 Rawah 2002 0.555 0.4540.101 0.395 0.160 0.239 0.316 Rawah 2003 0.351 0.300 0.051 0.270 0.081 0.163 0.188 RMNP 2001 0.408 0.318 0.090 0.267 0.141 0.154 0.254 RMNP 2002 0.603 0.481 0.122 0.416 0.1870.262 0.341 RMNP 2003 0.590 0.472 0.118 0.404 0.186 0.219 0.371 Badlands 2001 1.194 0.895 0.299 0.776 0.418 0.461 0.733 Badlands 2002 0.685 0.532 0.153 0.464 0.221 0.284 0.401 Badlands 2003 0.974 0.7340.240 0.614 0.360 0.312 0.662 Wind Cave 2001 0.978 0.769 0.209 0.666 0.312 0.377 0.601 Wind Cave 2002 1.031 0.831 0.200 0.734 0.2970.475 0.556 Wind Cave 2003 0.739 0.562 0.1770.498 0.241 0.321 0.418 Rawah 2001 0.307 0.248 0.059 0.213 0.0940.119 0.188 Rawah 2002 0.521 0.4170.1040.366 0.155 0.229 0.292 Rawah 2003 0.327 0.275 0.052 0.250 0.0770.154 0.173 RMNP 2001 0.379 0.2870.092 0.242 0.1370.147 0.232 RMNP 2002 0.580 0.450 0.130 0.386 0.1940.251 0.329 RMNP 2003 0.551 0.429 0.122 0.370 0.181 0.203 0.348 Badlands 2001 1.141 0.923 0.218 0.810 0.331 0.472 0.669 Badlands 2002 0.733 0.5770.156 0.493 0.240 0.299 0.434 Badlands 2003 0.896 0.696 0.200 0.593 0.303 0.309 0.587 Wind Cave 2001 0.988 0.7870.201 0.683 0.305 0.389 0.599 Wind Cave 2002 0.993 0.800 0.193 0.702 0.291 0.461 0.532 Wind Cave 2003 0.728 0.583 0.145 0.496 0.232 0.336 0.392 Rawah 2001 0.314 0.258 0.056 0.227 0.0870.144 0.170 Rawah 2002 0.533 0.432 0.101 0.380 0.153 0.241 0.292 Rawah 2003 0.348 0.296 0.052 0.269 0.079 0.166 0.182 RMNP 2001 0.392 0.301 0.091 0.255 0.1370.162 0.230 RMNP 2002 0.584 0.473 0.111 0.417 0.1670.276 0.308 RMNP 2003 0.555 0.438 0.1170.379 0.176 0.220 0.335 Unit 3 Basin Electric – Laramie River Station PacifiCorp – Wyodak PacifiCorp – Naughton

Unit 3

Unit 1

Unit 1

Unit 2

Notes: (1) EPA obtained the original CALPUFF/CALPOST input files,meteorological data, and other modleing data from Josh Nall of Wyoming DEQ in the fall of 2010.. Additional CALPUFF/CALPOST input files for Laramie River Station were obtained from Josh Nall in winter 2012. (2)EPArevised the baseline emission inputs to reflect Pacirficorp's committed SO2 and PM controls that are required under federally enforceableNSR permits. Therefore,the the visibility improvement shown is that achieved by just the NOx control. Also, EPA performed model runs reflecting NOxcontrol with SNCR. (3) The 98th pecentile visiblity impacts are given for the worstcase year and Class I area (4) Relative humidity and background concentrations are consistent with corrections made by WYDEQ to PacifiCorp's orignial CALPOST inputs.