Name: Steve Christian

Title: Supervising Engineer - Environmental Company: PPL Montana LLC Sign Date: 9/3/2010 Name: Jeff Kunstling Title: Project Manager Company: TRC Companies, Inc. Sign Date: 9/3/2010 Permitted Facility Representative / Date Testing Company Representative / Date 

### Utility Boiler MACT ICR - Colstrip Unit 3

Final Test Report for

/ / Based on information and belief formed after reasonable inquiry, I certify that the statements and information in this test report are true, accurate, and complete. I have reviewed all testing details and results in this test report and hereby certify that the test report is authentic and accurate.

Tuesday, February 01, 2011 Page 1 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Facility Information: Colstrip Plant 601 Willow Avenue

Colstrip MT 59323 Contact: Steve Christian Phone: 406-748-5019 Fax: 406-748-5900 Email: sjchristian@pplweb.com Testing Company: TRC Companies, Inc. 5540 Centerview Drive Suite 100 Raleigh NC 27606 Contact: Jeff Kunstling Phone: 919-256-6234 Fax: 919-838-9661 Email: jkunstling@trcsolutions.com

Air Permit Number: 6076 Permitted Source ID/Name: 3 Permitted Maximum Process Rate: N/A Max. Normal Operation Process Rate: N/A Target Process Test Rate N/A

Description of the source (including control equipment). Please see the attachments for source or process flow diagram: Unit 3 is a 805 GMWe boiler firing mainly subbituminous coal from the Rosebud Mine near Colstrip. The maximum feed rate for the coal burned in the unit is approximately 456 tons/hour. Industry/SCC/NAIS 221112

Sampling Location Information:

Test Parameter Information: AFS #: 3008700007 FRS #: 110017416946

SCC / Description 10100226 External Combustion Boilers - Electric Generation - Bituminous/Subbituminous Coal - Pulverized Coal: Dry Bottom Tangential (Subbituminous Coal)
The following state and federal regulations that apply to the proposed testing:

Location Round

Duct Diam. Distance from upstream dist. Distance from

downstream dist. Number of

Traverse Ports Equiv. Diam Min.Travers Points Rect. Duct Length /Width Stack Exit 288 2400 3756 4 0 3 0 0

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location Carbon Monoxide Method 10 3 120 0 Stack Exit Total organic compounds

(TOC) as Propane Method 25A 3 120 0 NMHC emissions only. Methane emissions reported in excel template. Stack Exit

Hydrogen Chloride Method 26A 3 60 0 Stack Exit Hydrogen Fluoride Method 26A 3 60 0 Stack Exit Cadmium Method 29 3 240 0 Stack Exit Tuesday, February 01, 2011 Page 2 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010

The following describes any modifications and/or deviations to the applicable test methods. If alternative methods were requested, see the attachments for documentation of request AND approval, including dates.

Selenium Method 29 3 240 0 Stack Exit Nickel Method 29 3 240 0 Stack Exit Manganese Method 29 3 240 0 Stack Exit Lead Method 29 3 240 0 Stack Exit Antimony Method 29 3 240 0 Stack Exit Arsenic Method 29 3 240 0 Stack Exit Cobalt Method 29 3 240 0 Stack Exit Chromium Method 29 3 240 0 Stack Exit Beryllium Method 29 3 240 0 Stack Exit Filterable Particulate Method 29 3 240 0 Stack Exit Filterable Particulate Method 5/OTM-28 3 240 0 Stack Exit Inorganic (Aqueous)

Condensible Part. Method 5/OTM-28 3 240 0 Stack Exit Organic Condensible

Particulate Method 5/OTM-28 3 240 0 Stack Exit

Total Particulate Method 5/OTM-28 3 240 0 Stack Exit Sulfur Dioxide Method 6C 3 60 0 Stack Exit Nitrogen oxides (NOx) Method 7E 3 60 0 Stack Exit

Tuesday, February 01, 2011 Page 3 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Sampling / Stack Data Results Summary Location Stack Exit - Method 10 Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Fuel Type Fw Fc

Location Stack Exit - Method 25A Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Fuel Type Fw Fc

Tuesday, February 01, 2011 Page 4 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 26A Average Run Number 1 2 3 Test Date 6/22/2010 6/22/2010 6/22/2010 Run Start Time Run Finish Time Net Run Time, minutes 60 60 60 Dry Gas Meter Volume Sampled, dscf 49.999 49.643 49.987 49.876 Moisture Content of Stack Gas, % 17.25 17.42 18.25 17.640 Moisture Saturation at Stack Gas Temperature, % 75.86 84.88 84.92 81.887 Carbon Dioxide, % 13.01 13.03 13.17 13.070 Oxygen, % 6.68 6.62 6.48 6.593 Average Stack Gas Temperature, °F 192.75 197.83 197.83 196.137 Dry Volumetric Flow Rate, dry scfm 1,863,656.0 1,856,049.5 1,836,855.7 1,852,187.06 7 Actual Wet Volumetric Flue Gas Flow Rate, acfm 3,138,855.8 3,173,599.3 3,173,870.7 3,162,108.60 0 Percent Isokinetic of Sampling Rate, % 100.6 100.3 102.0 100.967 F-Factor, dscfm/MMBtu @ %O2 9820 9820 9820 9,820.000 Fw 0 0 0 0.000 Fc 0 0 0 0.000

Location Stack Exit - Method 29 Average Run Number Test Date Run Start Time Run Finish Time Net Run Time, minutes Dry Gas Meter Volume Sampled, dscf Moisture Content of Stack Gas, % Moisture Saturation at Stack Gas Temperature, % Carbon Dioxide, % Oxygen, % Average Stack Gas Temperature, °F Dry Volumetric Flow Rate, dry scfm Actual Wet Volumetric Flue Gas Flow Rate, acfm Percent Isokinetic of Sampling Rate, % F-Factor, dscfm/MMBtu @ %O2 Fw Fc

Tuesday, February 01, 2011 Page 5 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 5/OTM-28 Average Run Number Test Date Run Start Time Run Finish Time Net Run Time, minutes Dry Gas Meter Volume Sampled, dscf Moisture Content of Stack Gas, % Moisture Saturation at Stack Gas Temperature, % Carbon Dioxide, % Oxygen, % Average Stack Gas Temperature, °F Dry Volumetric Flow Rate, dry scfm Actual Wet Volumetric Flue Gas Flow Rate, acfm Percent Isokinetic of Sampling Rate, % F-Factor, dscfm/MMBtu @ %O2 Fw Fc

Location Stack Exit - Method 6C Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Fuel Type Fw Fc

Tuesday, February 01, 2011 Page 6 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 7E Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Fuel Type Fw Fc

Tuesday, February 01, 2011 Page 7 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Emissions Summary Location: Stack Exit - Method 10 Compound: Carbon Monoxide Average Run 1 2 3 lb/mmBtuO2 1.55E-01 8.11E-02 8.50E-02 0.107 ppm 1.48E+02 7.78E+01 8.12E+01 102.333 ppm@7%O2 1.45E+02 7.56E+01 7.92E+01 99.933
Location: Stack Exit - Method 25A Compound: Total organic compounds (TOC) as Average Run 1 2 3 lb/mmBtuO2 1.66E-03 1.14E-03 8.74E-04 0.001 ppm 1.00E+00 6.93E-01 5.30E-01 0.741 ppm@7%O2 9.78E-01 6.73E-01 5.17E-01 0.723
Location: Stack Exit - Method 26A Compound: Hydrogen Chloride Average RunNumber 1 2 3 Mass_mg 0.126 0.0783 0.0894 0.098 lb/mmBtuO2 8.02E-05 5.00E-05 5.61E-05 0.000 Compound: Hydrogen Fluoride Average RunNumber 1 2 3 Mass_mg 0.225 0.207 0.236 0.223 lb/mmBtuO2 1.43E-04 1.32E-04 1.48E-04 0.000
Location: Stack Exit - Method 29 Compound: Antimony Average RunNumber 1 2 3 Mass_mg 0.0079 0.0054 0.0051 0.006 lb/mmBtuO2 1.26E-06 1.16E-06 1.10E-06 0.000 Compound: Arsenic Average RunNumber 1 2 3 Mass_mg 0.0161 0.0129 0.0152 0.015 lb/mmBtuO2 2.56E-06 2.77E-06 3.29E-06 0.000 Compound: Beryllium Average RunNumber 1 2 3 Mass_mg 0.00062 0.00049 0.00063 0.001 lb/mmBtuO2 9.87E-08 1.05E-07 1.36E-07 0.000

Tuesday, February 01, 2011 Page 8 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Compound: Cadmium Average RunNumber 1 2 3 Mass_mg 0.00353 0.00281 0.00253 0.003 lb/mmBtuO2 5.62E-07 6.03E-07 5.48E-07 0.000 Compound: Chromium Average RunNumber 1 2 3 Mass_mg 0.027 0.0167 0.0222 0.022 lb/mmBtuO2 4.30E-06 3.58E-06 4.81E-06 0.000 Compound: Cobalt Average RunNumber 1 2 3 Mass_mg 0.0019 0.0015 0.00153 0.002 lb/mmBtuO2 3.03E-07 3.22E-07 3.31E-07 0.000 Compound: Filterable Particulate Average RunNumber 1 2 3 Mass_mg 144.8 110 103.2 119.333 lb/mmBtuO2 2.31E-02 2.36E-02 2.24E-02 0.023 Compound: Lead Average RunNumber 1 2 3 Mass_mg 0.0361 0.0201 0.0196 0.025 lb/mmBtuO2 5.75E-06 4.31E-06 4.25E-06 0.000 Compound: Manganese Average RunNumber 1 2 3 Mass_mg 0.1069 0.0811 0.0763 0.088 lb/mmBtuO2 1.70E-05 1.74E-05 1.65E-05 0.000 Compound: Nickel Average RunNumber 1 2 3 Mass_mg 0.0259 0.0261 0.0162 0.023 lb/mmBtuO2 4.12E-06 5.60E-06 3.51E-06 0.000 Compound: Selenium Average RunNumber 1 2 3 Mass_mg 0.0735 0.1263 0.0475 0.082 lb/mmBtuO2 1.17E-05 2.71E-05 1.03E-05 0.000
Location: Stack Exit - Method 5/OTM-28 Compound: Filterable Particulate Average RunNumber 1 2 3 Mass_mg 159.1 106.3 106.8 124.067 Tuesday, February 01, 2011 Page 9 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010

Process Run Data lb/mmBtuO2 2.54E-02 2.47E-02 2.53E-02 0.025 Compound: Inorganic (Aqueous) Condensible Pa Average RunNumber 1 2 3 Mass_mg 11.3 7.3 11.2 9.933 lb/mmBtuO2 1.80E-03 1.69E-03 2.66E-03 0.002 Compound: Organic Condensible Particulate Average RunNumber 1 2 3 Mass_mg 3.7 2.3 5.8 3.933 lb/mmBtuO2 5.90E-04 5.34E-04 1.38E-03 0.001 Compound: Total Particulate Average RunNumber 1 2 3 Mass_mg 174.1 115.9 123.8 137.933 lb/mmBtuO2 2.78E-02 2.69E-02 2.94E-02 0.028
Location: Stack Exit - Method 6C Compound: Sulfur Dioxide Average Run 1 2 3 lb/mmBtuO2 5.74E-02 2.33E-02 5.51E-02 0.045 ppm 2.39E+01 9.73E+00 2.33E+01 18.977 ppm@7%O2 2.34E+01 9.47E+00 2.25E+01 18.457
Location: Stack Exit - Method 7E Compound: Nitrogen oxides (NOx) Average Run 1 2 3 lb/mmBtuO2 1.54E-01 1.57E-01 1.56E-01 0.156 ppm 8.95E+01 9.17E+01 9.16E+01 90.933 ppm@7%O2 8.75E+01 8.93E+01 8.83E+01 88.367

Tuesday, February 01, 2011 Page 10 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Process Run Data

Run Name Value UOM Comments Target Value 1 Heat Input 6097 Million Btus/hr Collected during run 1 M26A, M7E, and M6C 0

1 Coal FR Mill D 75.73 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

1 Coal FR Mill C 75.61 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

2 Heat Input 6097 Million Btus/hr Collected during run 2 M26A, M7E, and M6C 0

2 Coal FR Mill D 75.63 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Coal FR Mill C 75.42 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Coal FR Mill B 75.56 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Coal FR Mill A 0.18 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Flue Gas O2 2.79 % Collected during run 2 M26A, M7E, and M6C 0

2 Furn Press SH/RH 0.272 SH/RH Collected during run 2 M26A, M7E, and M6C 0

2 Furn Press Fin/SH 0.473 Fin/SH Collected during run 2 M26A, M7E, and M6C 0

2 Econ SH delta P 1.76 delta P Collected during run 2 M26A, M7E, and M6C 0

2 Stack SO2 0.03 lb/MMBtu Collected during run 2 M26A, M7E, and M6C 0

2 Stack NOx 0.156 lb/MMBtu Collected during run 2 M26A, M7E, and M6C 0

2 Coal FR Mill E 75.7 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

Tuesday, February 01, 2011 Page 11 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 2 Coal FR Mill F 0.1 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Coal FR Mill G 75.14 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Coal FR Mill H 75.81 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Gross Electric Generation 649.3 GMW Collected during run 2 M26A, M7E, and M6C 0

2 Coal Firing Rate 912.83 Klb/hr Collected during run 2 M26A, M7E, and M6C 0

2 Boiler Efficiency 86.63 % Collected during run 2 M26A, M7E, and M6C 0

2 Opacity 15.03 % Collected during run 2 M26A, M7E, and M6C 0

2 Sootblower Steam Pressure 555.78 psig Collected during run 2 M26A, M7E, and M6C 0

2 SA1 amps 249.47 amps Collected during run 2 M26A, M7E, and M6C 0

2 SA2 amps 257.73 amps Collected during run 2 M26A, M7E, and M6C 0

2 SA3 amps 255.25 amps Collected during run 2 M26A, M7E, and M6C 0

2 SA4 amps 250.48 amps Collected during run 2 M26A, M7E, and M6C 0

2 SA5 amps 257.85 amps Collected during run 2 M26A, M7E, and M6C 0

2 SA6 amps 258.24 amps Collected during run 2 M26A, M7E, and M6C 0

2 SA7 amps 0 amps Collected during run 2 M26A, M7E, and M6C 0

2 SA8 amps 0 amps Collected during run 2 M26A, M7E, and M6C 0

Tuesday, February 01, 2011 Page 12 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 2 Plumb Bob delta P 0.31 delta P Collected during run 2 M26A, M7E, and M6C 0

2 Mist Elim delta P 0 delta P Collected during run 2 M26A, M7E, and M6C 0

2 Rehtr 8 Gas delta P 0 delta P Collected during run 2 M26A, M7E, and M6C 0

2 Wash Tray 8 delta P 0.096 delta P Collected during run 2 M26A, M7E, and M6C 0

2 Net Electric Generation 599.3 NMW Collected during run 2 M26A, M7E, and M6C 0

3 Heat Input 6097 Million Btus/hr Collected during run 3 M26A, M7E, and M6C 0

3 Coal FR Mill D 75.89 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Coal FR Mill C 75.58 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Coal FR Mill B 75.76 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Coal FR Mill A 0.18 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Flue Gas O2 2.68 % Collected during run 3 M26A, M7E, and M6C 0

3 Furn Press SH/RH 0.274 SH/RH Collected during run 3 M26A, M7E, and M6C 0

3 Furn Press Fin/SH 0.475 Fin/SH Collected during run 3 M26A, M7E, and M6C 0

3 Econ SH delta P 1.74 delta P Collected during run 3 M26A, M7E, and M6C 0

3 Stack SO2 0.054 lb/MMBtu Collected during run 3 M26A, M7E, and M6C 0

3 Stack NOx 0.155 lb/MMBtu Collected during run 3 M26A, M7E, and M6C 0

Tuesday, February 01, 2011 Page 13 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 3 Coal FR Mill E 75.91 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Coal FR Mill F 0.1 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Coal FR Mill G 75.42 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Coal FR Mill H 75.93 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Gross Electric Generation 649.3 GMW Collected during run 3 M26A, M7E, and M6C 0

3 Coal Firing Rate 914.88 Klb/hr Collected during run 3 M26A, M7E, and M6C 0

3 Boiler Efficiency 86.55 % Collected during run 3 M26A, M7E, and M6C 0

3 Opacity 15.89 % Collected during run 3 M26A, M7E, and M6C 0

3 Sootblower Steam Pressure 557.17 psig Collected during run 3 M26A, M7E, and M6C 0

3 SA1 amps 252.41 amps Collected during run 3 M26A, M7E, and M6C 0

3 SA2 amps 253.52 amps Collected during run 3 M26A, M7E, and M6C 0

3 SA3 amps 252.98 amps Collected during run 3 M26A, M7E, and M6C 0

3 SA4 amps 249.72 amps Collected during run 3 M26A, M7E, and M6C 0

3 SA5 amps 254.75 amps Collected during run 3 M26A, M7E, and M6C 0

3 SA6 amps 255.36 amps Collected during run 3 M26A, M7E, and M6C 0

3 SA7 amps 0 amps Collected during run 3 M26A, M7E, and M6C 0

Tuesday, February 01, 2011 Page 14 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 3 SA8 amps 0 amps Collected during run 3 M26A, M7E, and M6C 0

3 Plumb Bob delta P 0.3 delta P Collected during run 3 M26A, M7E, and M6C 0

3 Mist Elim delta P 0 delta P Collected during run 3 M26A, M7E, and M6C 0

3 Rehtr 8 Gas delta P 0 delta P Collected during run 3 M26A, M7E, and M6C 0

3 Wash Tray 8 delta P 0.097 delta P Collected during run 3 M26A, M7E, and M6C 0

3 Net Electric Generation 599.3 NMW Collected during run 3 M26A, M7E, and M6C 0

4 Heat Input 6097 Million Btus/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill D 75.3 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill C 75.04 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill B 75.09 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill A 0.18 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Flue Gas O2 2.79 % Collected during run 1 M5/29 and OTM 27/28 0

4 Furn Press SH/RH 0.289 SH/RH Collected during run 1 M5/29 and OTM 27/28 0

4 Furn Press Fin/SH 0.48 Fin/SH Collected during run 1 M5/29 and OTM 27/28 0

4 Econ SH delta P 1.73 delta P Collected during run 1 M5/29 and OTM 27/28 0

4 Stack SO2 0.073 lb/MMBtu Collected during run 1 M5/29 and OTM 27/28 0

Tuesday, February 01, 2011 Page 15 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 4 Stack NOx 0.168 lb/MMBtu Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill E 75.15 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill F 0.08 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill G 74.89 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Coal FR Mill H 75.35 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Gross Electric Generation 649.3 GMW Collected during run 1 M5/29 and OTM 27/28 0

4 Coal Firing Rate 900.04 Klb/hr Collected during run 1 M5/29 and OTM 27/28 0

4 Boiler Efficiency 86.45 % Collected during run 1 M5/29 and OTM 27/28 0

4 Opacity 17.16 % Collected during run 1 M5/29 and OTM 27/28 0

4 Sootblower Steam Pressure 558.32 psig Collected during run 1 M5/29 and OTM 27/28 0

4 SA1 amps 250.05 amps Collected during run 1 M5/29 and OTM 27/28 0

4 SA2 amps 245.66 amps Collected during run 1 M5/29 and OTM 27/28 0

4 SA3 amps 248.52 amps Collected during run 1 M5/29 and OTM 27/28 0

4 SA4 amps 251.24 amps Collected during run 1 M5/29 and OTM 27/28 0

4 SA5 amps 247.21 amps Collected during run 1 M5/29 and OTM 27/28 0

4 SA6 amps 248.84 amps Collected during run 1 M5/29 and OTM 27/28 0

Tuesday, February 01, 2011 Page 16 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 4 SA7 amps 0 amps Collected during run 1 M5/29 and OTM 27/28 0

4 SA8 amps 0 amps Collected during run 1 M5/29 and OTM 27/28 0

4 Plumb Bob delta P 0.32 delta P Collected during run 1 M5/29 and OTM 27/28 0

4 Mist Elim delta P 0 delta P Collected during run 1 M5/29 and OTM 27/28 0

4 Rehtr 8 Gas delta P 0 delta P Collected during run 1 M5/29 and OTM 27/28 0

4 Wash Tray 8 delta P 0.094 delta P Collected during run 1 M5/29 and OTM 27/28 0

4 Net Electric Generation 599.3 NMW Collected during run 1 M5/29 and OTM 27/28 0

5 Heat Input 6098 Million Btus/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill D 66.65 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill C 66.5 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill B 66.51 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill A 66.39 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Flue Gas O2 2.64 % Collected during run 2 M5/29 and OTM 27/28 0

5 Furn Press SH/RH 0.305 SH/RH Collected during run 2 M5/29 and OTM 27/28 0

5 Furn Press Fin/SH 0.489 Fin/SH Collected during run 2 M5/29 and OTM 27/28 0

5 Econ SH delta P 1.77 delta P Collected during run 2 M5/29 and OTM 27/28 0

Tuesday, February 01, 2011 Page 17 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 5 Stack SO2 0.099 lb/MMBtu Collected during run 2 M5/29 and OTM 27/28 0

5 Stack NOx 0.188 lb/MMBtu Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill E 66.57 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill F 0.09 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill G 66.3 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Coal FR Mill H 56.4 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Gross Electric Generation 658.8 GMW Collected during run 2 M5/29 and OTM 27/28 0

1 Coal FR Mill B 75.63 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

1 Coal FR Mill A 0.17 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

5 Coal Firing Rate 908.25 Klb/hr Collected during run 2 M5/29 and OTM 27/28 0

5 Boiler Efficiency 86.72 % Collected during run 2 M5/29 and OTM 27/28 0

5 Opacity 16.62 % Collected during run 2 M5/29 and OTM 27/28 0

5 Sootblower Steam Pressure 559.75 psig Collected during run 2 M5/29 and OTM 27/28 0

5 SA1 amps 252.1 amps Collected during run 2 M5/29 and OTM 27/28 0

5 SA2 amps 251.08 amps Collected during run 2 M5/29 and OTM 27/28 0

5 SA3 amps 250.57 amps Collected during run 2 M5/29 and OTM 27/28 0

Tuesday, February 01, 2011 Page 18 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 5 SA4 amps 251.51 amps Collected during run 2 M5/29 and OTM 27/28 0

5 SA5 amps 253.49 amps Collected during run 2 M5/29 and OTM 27/28 0

5 SA6 amps 252.88 amps Collected during run 2 M5/29 and OTM 27/28 0

5 SA7 amps 0 amps Collected during run 2 M5/29 and OTM 27/28 0

5 SA8 amps 0 amps Collected during run 2 M5/29 and OTM 27/28 0

5 Plumb Bob delta P 0.29 delta P Collected during run 2 M5/29 and OTM 27/28 0

5 Mist Elim delta P 0 delta P Collected during run 2 M5/29 and OTM 27/28 0

5 Rehtr 8 Gas delta P 0 delta P Collected during run 2 M5/29 and OTM 27/28 0

5 Wash Tray 8 delta P 0.093 delta P Collected during run 2 M5/29 and OTM 27/28 0

5 Net Electric Generation 608.8 NMW Collected during run 2 M5/29 and OTM 27/28 0

6 Heat Input 6098 Million Btus/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill D 64.32 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill C 64.14 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill B 64.17 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill A 64.23 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Flue Gas O2 2.84 % Collected during run 3 M5/29 and OTM 27/28 0

Tuesday, February 01, 2011 Page 19 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 6 Furn Press SH/RH 0.303 SH/RH Collected during run 3 M5/29 and OTM 27/28 0

6 Furn Press Fin/SH 0.468 Fin/SH Collected during run 3 M5/29 and OTM 27/28 0

6 Econ SH delta P 1.72 delta P Collected during run 3 M5/29 and OTM 27/28 0

6 Stack SO2 0.075 lb/MMBtu Collected during run 3 M5/29 and OTM 27/28 0

6 Stack NOx 0.175 lb/MMBtu Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill E 64.18 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill F 0.1 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill G 64.02 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Coal FR Mill H 59.29 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Gross Electric Generation 658.8 GMW Collected during run 3 M5/29 and OTM 27/28 0

6 Coal Firing Rate 893.93 Klb/hr Collected during run 3 M5/29 and OTM 27/28 0

6 Boiler Efficiency 86.58 % Collected during run 3 M5/29 and OTM 27/28 0

6 Opacity 16.54 % Collected during run 3 M5/29 and OTM 27/28 0

6 Sootblower Steam Pressure 554.9 psig Collected during run 3 M5/29 and OTM 27/28 0

6 SA1 amps 235.11 amps Collected during run 3 M5/29 and OTM 27/28 0

6 SA2 amps 251.95 amps Collected during run 3 M5/29 and OTM 27/28 0

Tuesday, February 01, 2011 Page 20 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 6 SA3 amps 251.82 amps Collected during run 3 M5/29 and OTM 27/28 0

6 SA4 amps 251.98 amps Collected during run 3 M5/29 and OTM 27/28 0

6 SA5 amps 249.49 amps Collected during run 3 M5/29 and OTM 27/28 0

6 SA6 amps 248.89 amps Collected during run 3 M5/29 and OTM 27/28 0

6 SA7 amps 0 amps Collected during run 3 M5/29 and OTM 27/28 0

6 SA8 amps 0 amps Collected during run 3 M5/29 and OTM 27/28 0

6 Plumb Bob delta P 0.27 delta P Collected during run 3 M5/29 and OTM 27/28 0

6 Mist Elim delta P 0 delta P Collected during run 3 M5/29 and OTM 27/28 0

6 Rehtr 8 Gas delta P 0 delta P Collected during run 3 M5/29 and OTM 27/28 0

6 Wash Tray 8 delta P 0.092 delta P Collected during run 3 M5/29 and OTM 27/28 0

6 Net Electric Generation 608.8 NMW Collected during run 3 M5/29 and OTM 27/28 0

7 Heat Input 6066 Million Btus/hr Collected during run 1 M10 and M25A 0

7 Coal FR Mill D 64.85 Klb/hr Collected during run 1 M10 and M25A 0

7 Coal FR Mill C 64.62 Klb/hr Collected during run 1 M10 and M25A 0

7 Coal FR Mill B 64.73 Klb/hr Collected during run 1 M10 and M25A 0

7 Coal FR Mill A 64.73 Klb/hr Collected during run 1 M10 and M25A 0

Tuesday, February 01, 2011 Page 21 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 7 Flue Gas O2 2.9 % Collected during run 1 M10 and M25A 0

7 Furn Press SH/RH 0.282 SH/RH Collected during run 1 M10 and M25A 0

7 Furn Press Fin/SH 0.47 Fin/SH Collected during run 1 M10 and M25A 0

7 Econ SH delta P 1.74 delta P Collected during run 1 M10 and M25A 0

7 Stack SO2 0.082 lb/MMBtu Collected during run 1 M10 and M25A 0

7 Stack NOx 0.183 lb/MMBtu Collected during run 1 M10 and M25A 0

7 Coal FR Mill E 64.66 Klb/hr Collected during run 1 M10 and M25A 0

7 Coal FR Mill F 0.08 Klb/hr Collected during run 1 M10 and M25A 0

7 Coal FR Mill G 64.56 Klb/hr Collected during run 1 M10 and M25A 0

7 Coal FR Mill H 58.73 Klb/hr Collected during run 1 M10 and M25A 0

7 Gross Electric Generation 655.6 GMW Collected during run 1 M10 and M25A 0

7 Coal Firing Rate 888.29 Klb/hr Collected during run 1 M10 and M25A 0

7 Boiler Efficiency 86.67 % Collected during run 1 M10 and M25A 0

7 Opacity 15.97 % Collected during run 1 M10 and M25A 0

7 Sootblower Steam Pressure 554.82 psig Collected during run 1 M10 and M25A 0

7 SA1 amps 254.19 amps Collected during run 1 M10 and M25A 0

Tuesday, February 01, 2011 Page 22 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 7 SA2 amps 251.31 amps Collected during run 1 M10 and M25A 0

7 SA3 amps 251.22 amps Collected during run 1 M10 and M25A 0

7 SA4 amps 243.96 amps Collected during run 1 M10 and M25A 0

7 SA5 amps 252.09 amps Collected during run 1 M10 and M25A 0

7 SA6 amps 252.68 amps Collected during run 1 M10 and M25A 0

7 SA7 amps 0 amps Collected during run 1 M10 and M25A 0

7 SA8 amps 0 amps Collected during run 1 M10 and M25A 0

7 Plumb Bob delta P 0.24 delta P Collected during run 1 M10 and M25A 0

7 Mist Elim delta P 0 delta P Collected during run 1 M10 and M25A 0

7 Rehtr 8 Gas delta P 0 delta P Collected during run 1 M10 and M25A 0

7 Wash Tray 8 delta P 0.099 delta P Collected during run 1 M10 and M25A 0

7 Net Electric Generation 605.6 NMW Collected during run 1 M10 and M25A 0

8 Heat Input 6066 Million Btus/hr Collected during run 2 M10 and M25A 0

8 Coal FR Mill D 65.2 Klb/hr Collected during run 2 M10 and M25A 0

8 Coal FR Mill C 65.03 Klb/hr Collected during run 2 M10 and M25A 0

8 Coal FR Mill B 65.09 Klb/hr Collected during run 2 M10 and M25A 0

Tuesday, February 01, 2011 Page 23 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 8 Coal FR Mill A 65.19 Klb/hr Collected during run 2 M10 and M25A 0

8 Flue Gas O2 2.82 % Collected during run 2 M10 and M25A 0

8 Furn Press SH/RH 0.3 SH/RH Collected during run 2 M10 and M25A 0

8 Furn Press Fin/SH 0.46 Fin/SH Collected during run 2 M10 and M25A 0

8 Econ SH delta P 1.75 delta P Collected during run 2 M10 and M25A 0

8 Stack SO2 0.08 lb/MMBtu Collected during run 2 M10 and M25A 0

8 Stack NOx 0.16 lb/MMBtu Collected during run 2 M10 and M25A 0

8 Coal FR Mill E 65.11 Klb/hr Collected during run 2 M10 and M25A 0

8 Coal FR Mill F 0.09 Klb/hr Collected during run 2 M10 and M25A 0

8 Coal FR Mill G 64.81 Klb/hr Collected during run 2 M10 and M25A 0

8 Coal FR Mill H 58.45 Klb/hr Collected during run 2 M10 and M25A 0

8 Gross Electric Generation 655.6 GMW Collected during run 2 M10 and M25A 0

8 Coal Firing Rate 901.41 Klb/hr Collected during run 2 M10 and M25A 0

8 Boiler Efficiency 86.69 % Collected during run 2 M10 and M25A 0

8 Opacity 15.63 % Collected during run 2 M10 and M25A 0

8 Sootblower Steam Pressure 557.31 psig Collected during run 2 M10 and M25A 0

Tuesday, February 01, 2011 Page 24 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 8 SA1 amps 252.99 amps Collected during run 2 M10 and M25A 0

8 SA2 amps 249.63 amps Collected during run 2 M10 and M25A 0

8 SA3 amps 250.4 amps Collected during run 2 M10 and M25A 0

8 SA4 amps 247.17 amps Collected during run 2 M10 and M25A 0

8 SA5 amps 251.1 amps Collected during run 2 M10 and M25A 0

8 SA6 amps 253.15 amps Collected during run 2 M10 and M25A 0

8 SA7 amps 0 amps Collected during run 2 M10 and M25A 0

8 SA8 amps 1.11 amps Collected during run 2 M10 and M25A 0

8 Plumb Bob delta P 0.155 delta P Collected during run 2 M10 and M25A 0

8 Mist Elim delta P 0 delta P Collected during run 2 M10 and M25A 0

8 Rehtr 8 Gas delta P 0 delta P Collected during run 2 M10 and M25A 0

8 Wash Tray 8 delta P 0.057 delta P Collected during run 2 M10 and M25A 0

8 Net Electric Generation 605.6 NMW Collected during run 2 M10 and M25A 0

9 Heat Input 6066 Million Btus/hr Collected during run 3 M10 and M25A 0

9 Coal FR Mill D 66.15 Klb/hr Collected during run 3 M10 and M25A 0

9 Coal FR Mill C 65.84 Klb/hr Collected during run 3 M10 and M25A 0

Tuesday, February 01, 2011 Page 25 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 9 Coal FR Mill B 65.94 Klb/hr Collected during run 3 M10 and M25A 0

9 Coal FR Mill A 66.22 Klb/hr Collected during run 3 M10 and M25A 0

9 Flue Gas O2 2.91 % Collected during run 3 M10 and M25A 0

9 Furn Press SH/RH 0.31 SH/RH Collected during run 3 M10 and M25A 0

9 Furn Press Fin/SH 0.48 Fin/SH Collected during run 3 M10 and M25A 0

9 Econ SH delta P 1.82 delta P Collected during run 3 M10 and M25A 0

9 Stack SO2 0.1 lb/MMBtu Collected during run 3 M10 and M25A 0

9 Stack NOx 0.16 lb/MMBtu Collected during run 3 M10 and M25A 0

9 Coal FR Mill E 66.1 Klb/hr Collected during run 3 M10 and M25A 0

9 Coal FR Mill F 0.1 Klb/hr Collected during run 3 M10 and M25A 0

9 Coal FR Mill G 65.58 Klb/hr Collected during run 3 M10 and M25A 0

9 Coal FR Mill H 59.19 Klb/hr Collected during run 3 M10 and M25A 0

1 Flue Gas O2 2.99 % Collected during run 1 M26A, M7E, and M6C 0

1 Furn Press SH/RH 0.273 SH/RH Collected during run 1 M26A, M7E, and M6C 0

1 Furn Press Fin/SH 0.471 Fin/SH Collected during run 1 M26A, M7E, and M6C 0

1 Econ SH delta P 1.76 delta P Collected during run 1 M26A, M7E, and M6C 0

Tuesday, February 01, 2011 Page 26 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 1 Stack SO2 0.078 lb/MMBtu Collected during run 1 M26A, M7E, and M6C 0

9 Gross Electric Generation 655.6 GMW Collected during run 3 M10 and M25A 0

9 Coal Firing Rate 915.13 Klb/hr Collected during run 3 M10 and M25A 0

9 Boiler Efficiency 86.66 % Collected during run 3 M10 and M25A 0

9 Opacity 16.16 % Collected during run 3 M10 and M25A 0

9 Sootblower Steam Pressure 551.5 psig Collected during run 3 M10 and M25A 0

9 SA1 amps 255.95 amps Collected during run 3 M10 and M25A 0

9 SA2 amps 254.27 amps Collected during run 3 M10 and M25A 0

9 SA3 amps 253.62 amps Collected during run 3 M10 and M25A 0

9 SA4 amps 251.68 amps Collected during run 3 M10 and M25A 0

9 SA5 amps 255.53 amps Collected during run 3 M10 and M25A 0

9 SA6 amps 257.35 amps Collected during run 3 M10 and M25A 0

9 SA7 amps 0 amps Collected during run 3 M10 and M25A 0

9 SA8 amps 0.14 amps Collected during run 3 M10 and M25A 0

9 Plumb Bob delta P 0.183 delta P Collected during run 3 M10 and M25A 0

9 Mist Elim delta P 0 delta P Collected during run 3 M10 and M25A 0

Tuesday, February 01, 2011 Page 27 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 9 Rehtr 8 Gas delta P 0 delta P Collected during run 3 M10 and M25A 0

9 Wash Tray 8 delta P 0.043 delta P Collected during run 3 M10 and M25A 0

9 Net Electric Generation 605.6 NMW Collected during run 3 M10 and M25A 0

1 Stack NOx 0.151 lb/MMBtu Collected during run 1 M26A, M7E, and M6C 0

1 Coal FR Mill E 75.59 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

1 Coal FR Mill F 0.1 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

1 Coal FR Mill G 75.01 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

1 Coal FR Mill H 75.74 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

1 Gross Electric Generation 649.3 GMW Collected during run 1 M26A, M7E, and M6C 0

1 Coal Firing Rate 900.07 Klb/hr Collected during run 1 M26A, M7E, and M6C 0

1 Boiler Efficiency 86.85 % Collected during run 1 M26A, M7E, and M6C 0

1 Opacity 16.6 % Collected during run 1 M26A, M7E, and M6C 0

1 Sootblower Steam Pressure 560.05 psig Collected during run 1 M26A, M7E, and M6C 0

1 SA1 amps 251.26 amps Collected during run 1 M26A, M7E, and M6C 0

1 SA2 amps 253.62 amps Collected during run 1 M26A, M7E, and M6C 0

1 SA3 amps 251.63 amps Collected during run 1 M26A, M7E, and M6C 0

Tuesday, February 01, 2011 Page 28 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010

APCD Run Data

Process Lab Run Data 1 SA4 amps 250.61 amps Collected during run 1 M26A, M7E, and M6C 0

1 SA5 amps 255.01 amps Collected during run 1 M26A, M7E, and M6C 0

1 SA6 amps 254.87 amps Collected during run 1 M26A, M7E, and M6C 0

1 SA7 amps 0 amps Collected during run 1 M26A, M7E, and M6C 0

1 SA8 amps 0 amps Collected during run 1 M26A, M7E, and M6C 0

1 Plumb Bob delta P 0.31 delta P Collected during run 1 M26A, M7E, and M6C 0

1 Mist Elim delta P 0 delta P Collected during run 1 M26A, M7E, and M6C 0

1 Rehtr 8 Gas delta P 0 delta P Collected during run 1 M26A, M7E, and M6C 0

1 Wash Tray 8 delta P 0.094 delta P Collected during run 1 M26A, M7E, and M6C 0

1 Net Electric Generation 599.3 NMW Collected during run 1 M26A, M7E, and M6C 0

Run Name Value UOM Comments Target Value 1 OVERFIRE AIR 0 0 1 VENTURI SCRUBBER 0 0 1 ACTIVATED CARBON ADSORPTION 0 0

Run Name Value UOM Comments 1 Scrubber pH 7.03 pH 1 Scrubber Total Solids 24.6 % 1 Scrubber Dissolved Solids 6.9 % 1 Scrubber Suspended Solids 17.7 %

Tuesday, February 01, 2011 Page 29 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 2 Scrubber pH 7.1 pH 2 Scrubber Total Solids 23.6 % 2 Scrubber Dissolved Solids 6.7 % 2 Scrubber Suspended Solids 16.9 % 3 Scrubber pH 7.13 pH 3 Scrubber Total Solids 24.5 % 3 Scrubber Dissolved Solids 6.9 % 3 Scrubber Suspended Solids 17.6 % 4 Scrubber pH 7.15 pH 4 Scrubber Total Solids 25.2 % 4 Scrubber Dissolved Solids 7.3 % 4 Scrubber Suspended Solids 17.9 %

Tuesday, February 01, 2011 Page 30 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Sampling / Stack Data Results Detail Location Stack Exit - Method 10 Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type Fw Fc Cgasw Cgasw Units

Tuesday, February 01, 2011 Page 31 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 25A Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type Fw Fc Cgasw Cgasw Units

Tuesday, February 01, 2011 Page 32 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 26A Average Run Number 1 2 3 Test Date 6/22/2010 6/22/2010 6/22/2010 Run Start Time Run Finish Time Net Traversing Points 12 12 12 Net Run Time, minutes 60 60 60 Nozzle Diameter, inches 0.192 0.192 0.192 0.192 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.012 1.012 1.012 1.012 Barometric Pressure, inches of Mercury 26.67 26.52 26.52 26.570 Average Orifice Meter Differential, inches H2O 2.73 2.76 2.75 2.747 Dry Gas Meter Volume Sampled, cubic feet 55.812 56.189 56.745 56.249 Average Dry Gas Meter Temperature, °F 75.67 80.17 81.75 79.197 Dry Gas Meter Volume Sampled, dscf 49.999 49.643 49.987 49.876 Total Moisture Liquid collected, g 221.4 222.5 237 226.967 Volume of Water Vapor, standard cubic feet 10.42 10.47 11.16 10.683 Moisture Content of Stack Gas, % 17.25 17.42 18.25 17.640 Moisture Saturation at Stack Gas Temperature, % 75.86 84.88 84.92 81.887 Dry Mole Fraction 0.8275 0.8258 0.8175 0.824 Carbon Dioxide, % 13.01 13.03 13.17 13.070 Oxygen, % 6.68 6.62 6.48 6.593 Carbon Monoxide & Nitrogen, % 80.31 80.35 80.35 80.337 Fuel Factor 1.09 1.10 1.09 Dry Molecular Weight, lb/lb-Mole 30.35 30.35 30.37 30.357 Wet Molecular weight, lb/lb-Mole 28.22 28.20 28.11 28.177 Flue Gas Static Pressure, inches of H2O -1.8 -1.7 -1.8 -1.767 Absolute Flue Gas Pressure, inches of Mercury 26.54 26.40 26.39 26.443 Average Stack Gas Temperature, °F 192.75 197.83 197.83 196.137 Average Velocity Head, inches of H2O 2.9754414047 616 2.999927628

09127 2.989786570

13163 2.988 Average Stack Gas Velocity, feet/second 115.64 116.92 116.93 116.497 Stack Cross-Sectional Area, square feet 452.389 452.389 452.389 452.389 Dry Volumetric Flow Rate, dry scfm 1,863,656.0 1,856,049.5 1,836,855.7 1,852,187.0 67 Actual Wet Volumetric Flue Gas Flow Rate, acfm 3,138,855.8 3,173,599.3 3,173,870.7 3,162,108.6 00 Percent Isokinetic of Sampling Rate, % 100.6 100.3 102.0 100.967 Percent Excess Air, % 46.0 45.4 44.0 45.133 F-Factor, dscfm/MMBtu @ %O2 9820 9820 9820 9,820.000 Round Duct Diameter, inches 288 288 288 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000

Tuesday, February 01, 2011 Page 33 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 29 Average Run Number Test Date Run Start Time Run Finish Time Net Traversing Points Net Run Time, minutes Nozzle Diameter, inches Pitot Tube Coefficient Dry Gas Meter Calibration Factor Barometric Pressure, inches of Mercury Average Orifice Meter Differential, inches H2O Dry Gas Meter Volume Sampled, cubic feet Average Dry Gas Meter Temperature, °F Dry Gas Meter Volume Sampled, dscf Total Moisture Liquid collected, g Volume of Water Vapor, standard cubic feet Moisture Content of Stack Gas, % Moisture Saturation at Stack Gas Temperature, % Dry Mole Fraction Carbon Dioxide, % Oxygen, % Carbon Monoxide & Nitrogen, % Fuel Factor Dry Molecular Weight, lb/lb-Mole Wet Molecular weight, lb/lb-Mole Flue Gas Static Pressure, inches of H2O Absolute Flue Gas Pressure, inches of Mercury Average Stack Gas Temperature, °F Average Velocity Head, inches of H2O Average Stack Gas Velocity, feet/second Stack Cross-Sectional Area, square feet Dry Volumetric Flow Rate, dry scfm Actual Wet Volumetric Flue Gas Flow Rate, acfm Percent Isokinetic of Sampling Rate, % Percent Excess Air, % F-Factor, dscfm/MMBtu @ %O2 Round Duct Diameter, inches Rectangular Duct Width, inches Rectangular Duct Length, inches Fw Fc

Tuesday, February 01, 2011 Page 34 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 5/OTM-28 Average Run Number Test Date Run Start Time Run Finish Time Net Traversing Points Net Run Time, minutes Nozzle Diameter, inches Pitot Tube Coefficient Dry Gas Meter Calibration Factor Barometric Pressure, inches of Mercury Average Orifice Meter Differential, inches H2O Dry Gas Meter Volume Sampled, cubic feet Average Dry Gas Meter Temperature, °F Dry Gas Meter Volume Sampled, dscf Total Moisture Liquid collected, g Volume of Water Vapor, standard cubic feet Moisture Content of Stack Gas, % Moisture Saturation at Stack Gas Temperature, % Dry Mole Fraction Carbon Dioxide, % Oxygen, % Carbon Monoxide & Nitrogen, % Fuel Factor Dry Molecular Weight, lb/lb-Mole Wet Molecular weight, lb/lb-Mole Flue Gas Static Pressure, inches of H2O Absolute Flue Gas Pressure, inches of Mercury Average Stack Gas Temperature, °F Average Velocity Head, inches of H2O Average Stack Gas Velocity, feet/second Stack Cross-Sectional Area, square feet Dry Volumetric Flow Rate, dry scfm Actual Wet Volumetric Flue Gas Flow Rate, acfm Percent Isokinetic of Sampling Rate, % Percent Excess Air, % F-Factor, dscfm/MMBtu @ %O2 Round Duct Diameter, inches Rectangular Duct Width, inches Rectangular Duct Length, inches Fw Fc

Tuesday, February 01, 2011 Page 35 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 6C Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type Fw Fc Cgasw Cgasw Units

Tuesday, February 01, 2011 Page 36 of 37Utility Boiler MACT ICR - Colstrip Unit 3 9/3/2010 Location Stack Exit - Method 7E Average Run Number Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type Fw Fc Cgasw Cgasw Units

Tuesday, February 01, 2011 Page 37 of 37