1st high 

Receptor

2nd high 

Receptor

3rd high 

Receptor

4th high 

Receptor

Modeled Concentration from units 1 + 2 

(ug/m3)*

847.27 814.99 831.13 840.32

Modeled Concentration from unit 5 

(ug/m3) 0.39 1.14 2.62 0.28

Background Concentration + unit 5 

(ug/m3) 13.49 40.43 23.58 13.38

1-Hr SO2 NAAQS (ug/m3) 196.2 196.2 196.2 196.2

% Reduction needed to meet NAAQS 78.4% 80.9% 79.2% 78.2%

*

 Modeled concentrations are based on the 99th-percentile (4th high) of the annual distribution of daily 

maximum 1-hour values.

Portland Generating Station Final Rule Emissions Reduction Calculations
5th high 

Receptor

806.19

1.28

40.57

196.2

80.7%

stribution of daily 
X-coord Y-coord RecElv HillElv Rank Grid Unit 1 Unit 2 Unit 5

494400 4531500 157 178 4TH PGS100 380.37 466.90 0.39

494400 4531600 159 171 4TH PGS100 367.42 447.57 1.14

494500 4531600 168 172 4TH PGS100 384.00 447.13 2.62

494400 4531400 157 177 4TH PGS100 379.87 460.45 0.28

495900 4529600 221 221 4TH PGS100 363.12 443.07 1.28

494400 4531700 156 161 4TH PGS100 361.30 444.61 1.36

494500 4531700 163 171 4TH PGS100 363.20 442.73 1.04

494500 4531800 157 157 4TH PGS100 360.15 444.30 1.25

496000 4529600 226 238 4TH PGS100 354.99 448.62 1.22

494300 4531200 156 156 4TH PGS100 382.92 435.86 2.21

494500 4531900 150 150 4TH PGS100 355.59 443.26 1.46

494400 4531300 159 164 4TH PGS100 375.91 449.21 0.19

495500 4529400 198 198 4TH PGS100 360.42 451.97 1.96

495900 4529500 219 237 4TH PGS100 330.48 463.83 0.87

494400 4531800 149 161 4TH PGS100 354.45 440.21 1.58

494600 4531900 148 189 4TH PGS100 354.92 438.56 1.13

494500 4531500 170 176 4TH PGS100 363.65 430.30 0.64

494600 4532000 143 189 4TH PGS100 352.38 440.33 1.33

494500 4532000 132 189 4TH PGS100 350.60 441.65 1.65

495400 4529200 206 217 4TH PGS100 231.97 554.18 1.56

494600 4532100 139 184 4TH PGS100 348.21 439.20 1.53

494600 4531800 158 187 4TH PGS100 355.10 432.72 0.93

495600 4529400 203 203 4TH PGS100 351.61 450.84 1.89

495800 4529500 216 221 4TH PGS100 336.55 448.46 0.90

494300 4531100 153 153 4TH PGS100 374.76 399.93 0.39

495400 4529400 190 215 4TH PGS100 356.49 427.97 0.83

494400 4531900 136 187 4TH PGS100 347.25 435.09 1.78

496100 4529700 224 239 4TH PGS100 355.40 426.86 1.47

494500 4532100 119 189 4TH PGS100 344.09 437.22 1.84

494600 4532200 127 202 4TH PGS100 343.42 437.17 1.72

494500 4531400 166 166 4TH PGS100 361.32 420.23 0.47

496000 4529700 217 239 4TH PGS100 360.45 418.05 1.54

496200 4529700 232 234 4TH PGS100 254.18 518.58 2.59

494600 4531700 166 181 4TH PGS100 353.23 423.70 0.75

495700 4529400 207 221 4TH PGS100 341.85 447.76 1.83

494700 4532200 139 190 4TH PGS100 342.33 431.89 1.40

494700 4532100 146 185 4TH PGS100 344.14 429.46 1.22

495800 4529600 220 220 4TH PGS100 361.15 409.69 1.27

494600 4532300 112 207 4TH PGS100 337.98 434.08 1.90

494700 4532300 128 204 4TH PGS100 339.36 432.47 1.59

494400 4531200 158 158 4TH PGS100 367.32 431.20 0.12

495700 4529500 212 221 4TH PGS100 339.73 428.74 0.93

496100 4529600 237 237 4TH PGS100 245.04 521.82 2.39

494200 4531000 144 145 4TH PGS100 371.16 415.87 1.89

494700 4532000 151 187 4TH PGS100 344.47 424.64 1.03

494700 4532400 110 207 4TH PGS100 335.75 432.21 1.76
494500 4532200 110 203 4TH PGS100 336.72 430.92 2.02

495900 4529700 211 239 4TH PGS100 362.62 405.33 1.60

494300 4531400 150 153 4TH PGS100 359.59 431.64 0.37

494600 4532400 97 207 4TH PGS100 332.49 430.45 2.06
Units 1&2 Backgrnd ALL

847.27 13.10 860.76

814.99 39.30 855.42

831.13 20.96 854.71

840.32 13.10 853.70

806.19 39.30 846.76

805.91 39.30 846.57

805.92 39.30 846.26

804.44 39.30 844.99

803.61 39.30 844.12

818.78 20.96 841.95

798.84 39.30 839.60

825.12 13.10 838.42

812.39 23.58 837.93

794.31 41.92 837.10

794.66 39.30 835.54

793.48 39.30 833.90

793.95 39.30 833.89

792.71 39.30 833.33

792.25 39.30 833.20

786.15 41.92 829.62

787.42 39.30 828.25

787.83 39.30 828.06

802.45 23.58 827.92

785.00 41.92 827.82

774.69 49.78 824.85

784.46 39.30 824.59

782.34 39.30 823.41

782.26 39.30 823.03

781.30 39.30 822.45

780.58 39.30 821.60

781.55 39.30 821.32

778.49 39.30 819.33

772.76 41.92 817.26

776.94 39.30 816.98

789.62 23.58 815.03

774.22 39.30 814.92

773.60 39.30 814.11

770.83 41.92 814.02

772.06 39.30 813.26

771.83 39.30 812.72

798.51 13.10 811.74

768.47 41.92 811.32

766.86 41.92 811.17

787.03 20.96 809.88

769.11 39.30 809.43

767.96 39.30 809.02
767.64 39.30 808.97

767.95 39.30 808.86

791.22 13.10 804.69

762.94 39.30 804.30