### Name:

Title: Company: Sign Date: Name: Title: Company: Sign Date: Permitted Facility Representative / Date Testing Company Representative / Date 

## Colstrip Energy LP 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.

Thursday, January 20, 2011 Page 1 of 11

### Colstrip Energy LP

Facility Information: Colstrip Energy LP 18 Snider Subdivsion Road

Colstrip MT59323 Contact:Jim Geslin Phone:(406) 748-4729 Fax: Email: Testing Company: Bison Engineering 1400 11th Avenue

Helena MT59601 Contact:Steve Fryberger Phone:(406) 633-1523 Fax: Email: sfryberger@bison-eng.com

Air Permit Number: OP2035-2 Permitted Source ID/Name: Colstrip Energy Limited Partnership 10784 Permitted Maximum Process Rate: 543 MMBtu/hr Max. Normal Operation Process Rate: 635 MMBtu/hr Target Process Test Rate

Description of the source (including control equipment). Please see the attachments for source or process flow diagram: Industry/SCC/NAIS221112

Sampling Location Information:

Test Parameter Information: AFS #:030-087-0007A FRS #:110017416946

SCC / Description

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 BLR1 Stack 96 8 2 2 0 12 0 0

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location % H2O Method 1 - 4 3 120 0 BLR1 Stack Flowrate Method 1 - 4 3 120 0 BLR1 Stack Carbon Monoxide Method 10 3 120 0 BLR1 Stack Formaldehyde Method 0011 3 120 0 BLR1 Stack Total organic compounds

(TOC) as Propane Method 25A 3 120 0 Non-methane TOC as propane BLR1 Stack
Co2 Method 3A CO2 3 120 0 BLR1 Stack O2 Method 3A O2 3 120 0 BLR1 Stack


### Thursday, January 20, 2011 Page 2 of 11

### Colstrip Energy LP

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. N/A Sulfur Dioxide Method 6C 3 120 0 Method 6 BLR1 Stack



### Thursday, January 20, 2011 Page 3 of 11

### Colstrip Energy LP

Sampling / Stack Data Results Summary 

### Location BLR1 Stack - Method 0011 Average Run Number 1 2 3 Test Date 5/4/2010 5/6/2010 5/6/2010 Run Start Time 8:30:00 AM 11:10:00 AM 8:30:00 AM

Run Finish Time 10:20:00 AM1:00:00 PM10:20:00 AM Net Run Time, minutes 120 120 120 Dry Gas Meter Volume Sampled, dscf 75.409 76.260 75.409 75.693 Moisture Content of Stack Gas, % 9.69 9.79 10.38 9.953 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 13.17 13.17 13.17 13.170 Oxygen, % 7.01 7.01 7.01 7.010 Average Stack Gas Temperature, °F 312.75 312.92 312.75 312.807 Dry Volumetric Flow Rate, dry scfm 121,174.1 122,147.8 120,430.7 121,250.867 Actual Wet Volumetric Flue Gas Flow Rate, acfm 218,743.2 220,794.0 219,075.0 219,537.400 Percent Isokinetic of Sampling Rate, % 100.6 100.9 101.2 100.900 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Fw 10640 10640 10640 10,640.000 Fc 1800 1800 1800 1,800.000



### Location BLR1 Stack - Method 10 Average Run Number 1 2 3 Test Date 5/5/2010 5/5/2010 5/5/2010 Run Start Time 10:58:00 AM2:03:00 PM 4:28:00 PM Run Finish Time 12:58:00 PM4:03:00 PM 6:28:00 PM Carbon Dioxide, % 12.89 13.2 12.85 12.980 Oxygen, % 6.98 6.76 7.02 6.920 Dry Volumetric Flow Rate, dry scfm 132920 134540 134035 133,831.667 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 8.79 8.72 8.48 8.663 Fuel Type Override Override Override Fw 10640 10640 10640 10,640.000 Fc 1800 1800 1800 1,800.000



### Thursday, January 20, 2011 Page 4 of 11

### Colstrip Energy LP

Location BLR1 Stack - Method 25A Average Run Number 1 2 3 Test Date 5/5/2010 5/5/2010 5/5/2010 Run Start Time 10:58:00 AM2:03:00 PM 4:28:00 PM Run Finish Time 12:58:00 PM4:03:00 PM 6:28:00 PM Carbon Dioxide, % 12.89 13.2 12.85 12.980 Oxygen, % 6.98 6.76 7.02 6.920 Dry Volumetric Flow Rate, dry scfm 132920 134540 134035 133,831.667 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 8.79 8.72 8.48 8.663 Fuel Type Override Override Override Fw 10640 10640 10640 10,640.000 Fc 1800 1800 1800 1,800.000



### Thursday, January 20, 2011 Page 5 of 11

### Colstrip Energy LP

Emissions Summary

Process Run Data 

### Location: BLR1 Stack - Method 0011 Compound: Formaldehyde Average RunNumber 1 2 3 Mass_mg 0.12 0.037 0.04 0.066 lb/mmBtuO2 5.16E-05 1.57E-05 1.72E-05 0.000 ppm 4.50E-02 1.37E-02 1.50E-02 0.025 ppm@7%O2 4.50E-02 1.37E-02 1.50E-02 0.025


### Location: BLR1 Stack - Method 10 Compound: Carbon Monoxide Average Run 1 2 3 ppm 1.41E+00 1.16E+00 1.27E+00 1.280 ppm@7%O2 1.41E+00 1.14E+00 1.27E+00 1.273


### Location: BLR1 Stack - Method 25A Compound: Total organic compounds (TOC) as Average Run 1 2 3 lb/mmBtuO2 0.00E+00 0.00E+00 0.00E+00 0.000 ppm 0.00E+00 0.00E+00 0.00E+00 0.000 ppm@7%O2 0.00E+00 0.00E+00 0.00E+00 0.000



### Thursday, January 20, 2011 Page 6 of 11

### Colstrip Energy LP

Process Run Data



### Run Name Value UOM Comments Target Value 1 Gross MW 44.5 MW 0 

### 2 Gross MW 44.36 MW 0 3 Gross MW 44.32 MW 0 4 Gross MW 0 MW 0 

### 5 Gross MW 0 MW 0 6 Gross MW 0 MW 0 1 Net MW 37.89 MW 0 

### 2 Net MW 37.9 MW 0 3 Net MW 38.11 MW 0 4 Net MW 0 MW 0 

### 5 Net MW 0 MW 0 6 Net MW 0 MW 0 1 Total Steam Flow 357.72 K lb/hr 0 

### 2 Total Steam Flow 357.71 K lb/hr 0 3 Total Steam Flow 360.02 K lb/hr 0 4 Total Steam Flow 0 K lb/hr 0 

### 5 Total Steam Flow 0 K lb/hr 0 6 Total Steam Flow 0 K lb/hr 0 1 Baghouse Differential Pressure 7.13 in H2O 0 

### 2 Baghouse Differential Pressure 7.15 in H2O 0 3 Baghouse Differential Pressure 7.89 in H2O 0 4 Baghouse Differential Pressure 0 in H2O 0 

### 5 Baghouse Differential Pressure 0 in H2O 0 6 Baghouse Differential Pressure 0 in H2O 0 

### 1 Limestone Flow 8.12 K lb/hr 0 2 Limestone Flow 6.95 K lb/hr 0 3 Limestone Flow 7.9 K lb/hr 0 

### 4 Limestone Flow 0 K lb/hr 0 5 Limestone Flow 0 K lb/hr 0 6 Limestone Flow 0 K lb/hr 0 

### 1 Coal Flow 59.33 K lb/hr 0 2 Coal Flow 60.69 K lb/hr 0 3 Coal Flow 67.11 K lb/hr 0



### Thursday, January 20, 2011 Page 7 of 11

### Colstrip Energy LP

APCD Run Data

Process Lab Run Data 4 Coal Flow 0 K lb/hr 0 

### 5 Coal Flow 0 K lb/hr 0 6 Coal Flow 0 K lb/hr 0 1 Heat Rate 536.08 MMBtu/hr 0 

### 2 Heat Rate 526.24 MMBtu/hr 0 3 Heat Rate 579.22 MMBtu/hr 0 4 Heat Rate 0 MMBtu/hr 0 

### 5 Heat Rate 0 MMBtu/hr 0 6 Heat Rate 0 MMBtu/hr 0

Run Name Value UOM Comments Target Value 

### 1 ACTIVATED CARBON ADSORPTION 0 0 1 BAGHOUSE 0 0 1 DRY LIMESTONE INJECTION 0 0

Run Name ValueUOM Comments 

### 1 N/A 0

Thursday, January 20, 2011 Page 8 of 11

### Colstrip Energy LP

Sampling / Stack Data Results Detail 

### Location BLR1 Stack - Method 0011 Average Run Number 1 2 3 Test Date 5/4/2010 5/6/2010 5/6/2010 Run Start Time 8:30:00 AM11:10:00 AM 8:30:00 AM Run Finish Time 10:20:00 AM 1:00:00 PM10:20:00 AM Net Traversing Points 13 13 13 Net Run Time, minutes 120 120 120 Nozzle Diameter, inches 0.218 0.218 0.218 0.218 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.952 0.952 0.952 0.952 Barometric Pressure, inches of Mercury 26.79 26.79 26.79 26.790 Average Orifice Meter Differential, inches H2O 1.29 1.38 1.29 1.320 Dry Gas Meter Volume Sampled, cubic feet 87.765 87.825 87.765 87.785 Average Dry Gas Meter Temperature, °F 65.67 60.29 65.67 63.877 Dry Gas Meter Volume Sampled, dscf 75.409 76.260 75.409 75.693 Total Moisture Liquid collected, g 171.8 175.9 185.5 177.733 Volume of Water Vapor, standard cubic feet 8.09 8.28 8.73 8.367 Moisture Content of Stack Gas, % 9.69 9.79 10.38 9.953 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9031 0.9021 0.8962 0.900 Carbon Dioxide, % 13.17 13.17 13.17 13.170 Oxygen, % 7.01 7.01 7.01 7.010 Carbon Monoxide & Nitrogen, % 79.82 79.82 79.82 79.820 Fuel Factor 1.05 1.05 1.05 Dry Molecular Weight, lb/lb-Mole 30.39 30.39 30.39 30.390 Wet Molecular weight, lb/lb-Mole 29.19 29.18 29.10 29.157 Flue Gas Static Pressure, inches of H2O 1 1 1 1.000 Absolute Flue Gas Pressure, inches of Mercury 26.86 26.86 26.86 26.860 Average Stack Gas Temperature, °F 312.75 312.92 312.75 312.807 Average Velocity Head, inches of H2O 1.0350619892 44261.054057787

611961.035061989

24426 1.041 Average Stack Gas Velocity, feet/second 72.53 73.21 72.64 72.793 Stack Cross-Sectional Area, square feet 50.265 50.265 50.265 50.265 Dry Volumetric Flow Rate, dry scfm 121,174.1 122,147.8 120,430.7121,250.867 Actual Wet Volumetric Flue Gas Flow Rate, acfm 218,743.2 220,794.0 219,075.0219,537.400 Percent Isokinetic of Sampling Rate, % 100.6 100.9 101.2 100.900 Percent Excess Air, % 49.8 49.8 49.8 49.800 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Round Duct Diameter, inches 96 96 96 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000



### Thursday, January 20, 2011 Page 9 of 11

### Colstrip Energy LP

Location BLR1 Stack - Method 10 Average Run Number 1 2 3 Test Date 5/5/2010 5/5/2010 5/5/2010 Run Start Time 10:58:00 AM2:03:00 PM 4:28:00 PM Run Finish Time 12:58:00 PM4:03:00 PM 6:28:00 PM Carbon Dioxide, % 12.89 13.2 12.85 12.980 Oxygen, % 6.98 6.76 7.02 6.920 Fuel Factor 1.08 1.07 1.08 Dry Volumetric Flow Rate, dry scfm 132920 134540 134035133,831.667 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 8.79 8.72 8.48 8.663 Analyzer Make Thermo Analyzer Model 48i-HL Analyzer Serial Number 734025183 734,025,183 .000 Operating Range 10000 0 0 3,333.333 Operating Units ppm No. Readings/Avg. 1 0 0 0.333 Calibration Set 1 1 1 1.000 Calibration Pre Zero Cylinder ID Zero Air Zero Air Zero Air Calibration Pre Zero Cylinder Instrument Response -0.2 0.5 0.33 0.210 Calibration Pre Zero Cylinder Bias -0.8 -0.2 -0.54 -0.513 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID ALM048635- 25ALM048635

-25ALM048635-

25 Calibration Pre High Cylinder Instrument Response 25.27 24.6 24.62 24.830 Calibration Pre High Cylinder Bias 0.27 -0.8 -0.76 -0.430 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID Zero Air Zero Air Zero Air Calibration Post Zero Cylinder Instrument Response 0.5 0.33 -0.37 0.153 Calibration Post Zero Cylinder Bias -0.1 -0.54 -1.94 -0.860 Calibration Post Zero Cylinder Drift 0.7 0.34 1.4 0.813 Calibration Post High Cylinder ID ALM048635- 25ALM048635

-25ALM048635-

25 Calibration Post High Cylinder Instrument Response 24.6 24.62 23.66 24.293 Calibration Post High Cylinder Bias -0.4 -0.76 -2.68 -1.280 Calibration Post High Cylinder Drift 0.67 0.04 1.92 0.877 Cavg 1.55 1.54 1.21 1.433 Cavg Units ppmvd ppmvd ppmvd Cgas 1.4121 1.1624 1.2728 1.282 Cgas Units ppmvd ppmvd ppmvd Fuel Type Override Override Override Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000 Cgasw 0 0 0 0.000 Cgasw Units



### Thursday, January 20, 2011 Page 10 of 11

### Colstrip Energy LP

Location BLR1 Stack - Method 25A Average Run Number 1 2 3 Test Date 5/5/2010 5/5/2010 5/5/2010 Run Start Time 10:58:00 AM2:03:00 PM 4:28:00 PM Run Finish Time 12:58:00 PM4:03:00 PM 6:28:00 PM Carbon Dioxide, % 12.89 13.2 12.85 12.980 Oxygen, % 6.98 6.76 7.02 6.920 Fuel Factor 1.08 1.07 1.08 Dry Volumetric Flow Rate, dry scfm 132920 134540 134035133,831.667 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 8.79 8.72 8.48 8.663 Analyzer Make Thermo Analyzer Model 51 51.000 Analyzer Serial Number N/A Operating Range 10000 0 0 3,333.333 Operating Units ppm No. Readings/Avg. 1 0 0 0.333 Calibration Set 3 3 3 3.000 Calibration Pre Zero Cylinder ID Zero Air Zero Air Zero Air Calibration Pre Zero Cylinder Instrument Response -1.28 -1.23 -1.24 -1.250 Calibration Pre Zero Cylinder Bias 0.22 0.27 0.26 0.250 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID ALM002064- 25ALM002064

-25ALM002064-

25 Calibration Pre High Cylinder Instrument Response 24.54 27.31 25.63 25.827 Calibration Pre High Cylinder Bias -2.36 0.41 -1.27 -1.073 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID Zero Air Zero Air Zero Air Calibration Post Zero Cylinder Instrument Response -1.23 -1.24 1.52 -0.317 Calibration Post Zero Cylinder Bias 0.27 0.26 3.02 1.183 Calibration Post Zero Cylinder Drift 0.05 0.01 2.76 0.940 Calibration Post High Cylinder ID ALM002064- 25ALM002064

-25ALM002064-

25 Calibration Post High Cylinder Instrument Response 27.31 25.63 -3.19 16.583 Calibration Post High Cylinder Bias 0.41 -1.27 -30.09 -10.317 Calibration Post High Cylinder Drift 2.77 1.68 28.82 11.090 Cavg -1.27 -1.31 -1.3 -1.293 Cavg Units ppmvw ppmvw Cgas 0 0 0 0.000 Cgas Units ppmvd ppmvd Fuel Type Override Override Override Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000 Cgasw 0 0 0 0.000 Cgasw Units ppmvw ppmvw



### Thursday, January 20, 2011 Page 11 of 11