ANNUAL SULFUR DIOXIDE EMISSION REPORT ANNUAL SULFUR DIOXIDE (SO 2) EMISSION REPORT
PacifiCorp Company ID - 948 Carbon Power Plant Site ID - 10081

SUMMARY OF ANNUAL SO 2EMISSIONS SUBMITTED TO EPA FOR ACID RAIN PROGRAM Component Company ID ID Component 1999 2006 3974 01 Dry bottom tangentially fired utility boiler 1,826.50 3,345.97 3976 2 Dry bottom tangentially fired utility boiler 2,561.10 4,506.51 3974/8910 1 Dry bottom tangentially fired utility boi ler-oil NA NA 3976/8911 2 Dry bottom tangentially fired utility boi ler-oil NA NA 13687 12 Emergency diesel generator 0.003 0.006 13688 13 Emergency diesel fire pump 0.003 0.004 8912 14 Fly ash storage silo NA NA 8913 15 Bottom ash storage silo NA NA 5253 29 Ash transfer operations NA NA 5252 62 Coal transfer NA NA Mobile TOTAL

CHANGES IN MONITORING OR CALCULATION METHODS Component Company ID ID 3974 01

Component Company ID ID 3976 02

Requirements and Instructions. The Flow AdjustmentFactor calculated is 1.15. Adjustment of 2006 emissions to be comparable to 1999 emissions: The 2006 SO2 Emissions were adjusted using method 2of the Sulfur Dioxide Milestone Inventory Changed from Method 2 in 1999 to Method 2FH for 200 6. Component Dry bottom tangentially fired utility boiler Explanation of Change: Requirements and Instructions. The Flow AdjustmentFactor calculated is 1.17. Adjustment of 2006 emissions to be comparable to 1999 emissions: The 2006 SO2 Emissions were adjusted using method 2of the Sulfur Dioxide Milestone Inventory Changed from Method 2 in 1999 to Method 2FH for 200 6 Component Dry bottom tangentially fired utility boiler Explanation of Change:

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Component Company ID ID Component 8910 01

Component Company ID ID 8911 02

Adjustment of 2006 emissions to be comparable to 19 99 emissions: Dry bottom tangentially fired utility boiler Explanation of Change: NA, emissions are included in the CEM value for thi s Unit. Component Adjustment of 2006 emissions to be comparable to 1999 emissions: Dry bottom tangentially fired utility boiler Explanation of Change: NA, emissions are included in the CEM value for thi s Unit.

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Component Company ID ID 13687 12

Component Company ID ID Component 13688 13

Component Company ID ID Component 8912 14

Adjustment of 2006 emissions to be comparable to 19 99 emissions: There are no SO2 emissions from this source. Fly ash storage silo Explanation of Change: Adjustment of 2006 emissions to be comparable to 1999 emissions: Emergency diesel fire pump Unit #2 Explanation of Change: No changes, all values were calculated using AP-42 factors. Adjustment of 2006 emissions to be comparable to 1999 emissions: Explanation of Change: No changes, all values were calculated using AP-42 factors. Component Emergency diesel generator Unit #1

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Component Company ID ID Component 8913 15

Component Company ID ID Component 5253 29

Component Company ID ID Component 5252 62

Adjustment of 2006 emissions to be comparable to 19 99 emissions: Coal transfer Explanation of Change: There are no SO2 emissions from this source. Adjustment of 2006 emissions to be comparable to 1999 emissions: There are no SO2 emissions from this source. Ash transfer operations Explanation of Change: Adjustment of 2006 emissions to be comparable to 1999 emissions: Bottom ash storage silo Explanation of Change: There are no SO2 emissions from this source.

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Actuals Change Adjusted 2859.6 486.37 3,345.97 3918.406 588.10 4,506.51 0.2 0 0.20 0.294 0 0.29 0.006 0 0.01 0.004 0 0.00

0 0.00 0 0.00 0 0.00 0 0.00 0.472 0 0.47 6778.982 1074.465 7853.447

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