### Name:

Title: Company: Sign Date: Name: Title: Company: Sign Date: Permitted Facility Representative / Date Testing Company Representative / Date 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 22, 2011 Page 1 of 12

### Facility Information:

Craig Station Unit 1

Craig CO81626 Contact:Kerry Pabst Phone: 303-452-6111 Fax: 303-254-6013 Email: kpabst@tristategt.org Testing Company: Platt Environmental Services, Inc. 1520 Kensington Road
Suite 204
Oak Brook IL 60523 Contact:Eric Ehlers Phone:630-699-7690 Fax: 630-521-9494 Email: eehlers@plattenv.com

Air Permit Number: 6021 Permitted Source ID/Name: C1 C1 Permitted Maximum Process Rate: Max. Normal Operation Process Rate: Target Process Test Rate >90%

Description of the source (including control equipment). Please see the attachments for source or process flow diagram: Subbituminous fueled, wall fired boiler, low Nox burners, overfire air, baghouse, wet FGD Industry/SCC/NAIS221112

Sampling Location Information:

Test Parameter Information: AFS #:0808100018 FRS #: 110000468020

SCC / Description10100222 External Combustion Boilers - Electric Generation - Bituminous/Subbituminous Coal - Pulverized Coal: Dry Bottom (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 336 0 0 4 0 24 0 0

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location Mercury Sorbent Traps by 30B 3 120 0 Stack

Lead Method 29 3 240 0 Stack Selenium Method 29 3 240 0 Stack Manganese Method 29 3 240 0 Stack Antimony Method 29 3 240 0 Stack Arsenic Method 29 3 240 0 Stack Cobalt Method 29 3 240 0 Stack


### Tuesday, February 22, 2011 Page 2 of 12

### 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.

Chromium Method 29 3 240 0 Stack Beryllium Method 29 3 240 0 Stack Cadmium Method 29 3 240 0 Stack Nickel Method 29 3 240 0 Stack Co2 Method 3A CO2 3 480 0 Stack O2 Method 3A O2 3 480 0 Stack Inorganic (Aqueous)

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

Filterable Particulate Method 5/OTM-28 3 240 0 Stack Total Particulate Method 5/OTM-28 3 240 0 Stack Organic Condensible

Particulate Method 5/OTM-28 3 240 0 Stack



### Tuesday, February 22, 2011 Page 3 of 12

### Sampling / Stack Data Results Summary



### Location Stack - Method 29 Average Run Number M29-1 M29-2 M29-3
Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:13:00 AM 11:25:00 AM 6:00:00 AM

Run Finish Time 10:36:00 AM4:05:00 PM10:18:00 AM Net Run Time, minutes 240 240 240 Dry Gas Meter Volume Sampled, dscf 185.731 186.845 182.330 184.969 Moisture Content of Stack Gas, % 10.97 13.22 12.78 12.323 Moisture Saturation at Stack Gas Temperature, % 14.65 14.54 14.15 14.447 Carbon Dioxide, % 11.7 12.2 12 11.967 Oxygen, % 7.2 6.7 6.9 6.933 Average Stack Gas Temperature, °F 120.42 120.17 119.19 119.927 Dry Volumetric Flow Rate, dry scfm 1,220,179.91,190,588.0 1,169,465.3 1,193,411.06 7 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,896,393.01,896,762.5 1,850,581.1 1,881,245.53 3 Percent Isokinetic of Sampling Rate, % 102.0 105.1 104.4 103.833 F-Factor, dscfm/MMBtu @ %O2 9864 9853 9807 9,841.333
Fw 0 0 0 0.000
Fc 0 0 0 0.000



### Location Stack - Method 3A CO2 Average Run Number 1 2 3
Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:10:00 AM 11:25:00 AM 6:00:00 AM

Run Finish Time 10:39:00 AM4:12:00 PM10:27:00 AM Carbon Dioxide, % 0 0 0 0.000 Oxygen, % 0 0 0 0.000 Dry Volumetric Flow Rate, dry scfm 0 0 0 0.000 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Moisture, % 0 0 0 0.000 Fuel Type
Fw 0 0 0 0.000
Fc 0 0 0 0.000



### Tuesday, February 22, 2011 Page 4 of 12

### Location Stack - Method 3A O2 Average

Run Number 1 2 3
Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:10:00 AM 11:25:00 AM 6:00:00 AM

Run Finish Time 10:39:00 AM4:12:00 PM10:27:00 AM Carbon Dioxide, % 0 0 0 0.000 Oxygen, % 0 0 0 0.000 Dry Volumetric Flow Rate, dry scfm 1275007 1255617 1235023 1,255,215.66 7 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 12.6 12.8 12.3 12.567 Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Location Stack - Method 5/OTM-28 Average Run Number M5B/OTM2 8-1 M5B/OTM

28-2 M5B/OTM2

8-3
Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:13:00 AM 11:25:00 AM 6:00:00 AM

Run Finish Time 10:40:00 AM4:13:00 PM10:28:00 AM Net Run Time, minutes 240 240 240 Dry Gas Meter Volume Sampled, dscf 185.960 184.217 180.518 183.565 Moisture Content of Stack Gas, % 12.63 12.79 12.33 12.583 Moisture Saturation at Stack Gas Temperature, % 14.47 14.43 14.31 14.403 Carbon Dioxide, % 11.7 12.2 12 11.967 Oxygen, % 7.2 6.7 6.9 6.933 Average Stack Gas Temperature, °F 119.98 119.90 119.58 119.820 Dry Volumetric Flow Rate, dry scfm 1,114,059.41,094,920.4 1,083,245.4 1,097,408.40 0 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,763,021.1 1,734,942.8 1,706,495.1 1,734,819.66 7 Percent Isokinetic of Sampling Rate, % 102.3 103.1 102.2 102.533 F-Factor, dscfm/MMBtu @ %O2 9864 9853 9807 9,841.333
Fw 0 0 0 0.000
Fc 0 0 0 0.000



### Tuesday, February 22, 2011 Page 5 of 12

### Emissions Summary



### Location: Stack - Method 29 Compound: Antimony Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.003 0.003 0.0043 0.003 lb/mmBtuO2 5.36E-07 5.13E-07 7.61E-07 0.000 

### Compound: Arsenic Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.0039 0.0057 0.0145 0.008 lb/mmBtuO2 6.97E-07 9.75E-07 2.57E-06 0.000 

### Compound: Beryllium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.00075 0.00096 0.00286 0.002 lb/mmBtuO2 1.34E-07 1.64E-07 5.06E-07 0.000 

### Compound: Cadmium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.0009 0.00084 0.00204 0.001 lb/mmBtuO2 1.61E-07 1.44E-07 3.61E-07 0.000 

### Compound: Chromium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.20692 0.85808 2.49201 1.186 lb/mmBtuO2 3.70E-05 1.47E-04 4.41E-04 0.000 

### Compound: Cobalt Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.00606 0.01334 0.1497 0.056 lb/mmBtuO2 1.08E-06 2.28E-06 2.65E-05 0.000 

### Compound: Lead Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.00236 0.00511 0.00836 0.005 lb/mmBtuO2 4.22E-07 8.74E-07 1.48E-06 0.000 

### Compound: Manganese Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.61189 1.31259 4.33309 2.086 lb/mmBtuO2 1.09E-04 2.25E-04 7.67E-04 0.000 

### Compound: Nickel Average



### Tuesday, February 22, 2011 Page 6 of 12

### Process Run Data RunNumber M29-1 M29-2 M29-3 Mass_mg 0.24558 0.53438 1.61538 0.798 lb/mmBtuO2 4.39E-05 9.14E-05 2.86E-04 0.000 

### Compound: Selenium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.0085 0.01 0.0167 0.012 lb/mmBtuO2 1.52E-06 1.71E-06 2.96E-06 0.000



### Location: Stack - Method 5/OTM-28 Compound: Filterable Particulate Average RunNumber M5B/OTM28-1 M5B/OTM28-2 M5B/OTM28-3 Mass_mg 24.6 22.4 0 15.667 lb/mmBtuO2 4.39E-03 3.89E-03 0.00E+00 0.003 

### Compound: Inorganic (Aqueous) Condensible Pa Average RunNumber M5B/OTM28-1 M5B/OTM28-2 M5B/OTM28-3 Mass_mg 23.9 29.2 0 17.700 lb/mmBtuO2 4.26E-03 5.07E-03 0.00E+00 0.003 

### Compound: Organic Condensible Particulate Average RunNumber M5B/OTM28-1 M5B/OTM28-2 M5B/OTM28-3 Mass_mg 0.7 3.6 0 1.433 lb/mmBtuO2 1.25E-04 6.25E-04 0.00E+00 0.000 

### Compound: Total Particulate Average RunNumber M5B/OTM28-1 M5B/OTM28-2 M5B/OTM28-3 Mass_mg 49.2 55.2 0 34.800 lb/mmBtuO2 8.78E-03 9.58E-03 0.00E+00 0.006



### Tuesday, February 22, 2011 Page 7 of 12

### Process Run Data

APCD Run Data

Process Lab Run Data



### Tuesday, February 22, 2011 Page 8 of 12

### Sampling / Stack Data Results Detail



### Location Stack - Method 29 Average Run Number M29-1 M29-2 M29-3 Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:13:00 AM11:25:00 AM 6:00:00 AM Run Finish Time 10:36:00 AM 4:05:00 PM10:18:00 AM Net Traversing Points 52 52 52 Net Run Time, minutes 240 240 240 Nozzle Diameter, inches 0.265 0.265 0.265 0.265 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.992 0.992 0.992 0.992 Barometric Pressure, inches of Mercury 23.8 23.8 23.8 23.800 Average Orifice Meter Differential, inches H2O 2.07 2.01 1.92 2.000 Dry Gas Meter Volume Sampled, cubic feet 236.743 233.898 228.822 233.154 Average Dry Gas Meter Temperature, °F 74.47 64.80 65.98 68.417 Dry Gas Meter Volume Sampled, dscf 185.731 186.845 182.330 184.969 Total Moisture Liquid collected, g 486 604.9 567.5 552.800 Volume of Water Vapor, standard cubic feet 22.88 28.47 26.71 26.020 Moisture Content of Stack Gas, % 10.97 13.22 12.78 12.323 Moisture Saturation at Stack Gas Temperature, % 14.65 14.54 14.15 14.447 Dry Mole Fraction 0.8903 0.8678 0.8722 0.877 Carbon Dioxide, % 11.7 12.2 12 11.967 Oxygen, % 7.2 6.7 6.9 6.933 Carbon Monoxide & Nitrogen, % 81.1 81.1 81.1 81.100 Fuel Factor 1.17 1.16 1.17 Dry Molecular Weight, lb/lb-Mole 30.16 30.22 30.20 30.193 Wet Molecular weight, lb/lb-Mole 28.83 28.60 28.64 28.690 Flue Gas Static Pressure, inches of H2O -0.4 -0.3 -0.3 -0.333 Absolute Flue Gas Pressure, inches of Mercury 23.77 23.78 23.78 23.777 Average Stack Gas Temperature, °F 120.42 120.17 119.19 119.927 Average Velocity Head, inches of H2O 0.6031344111 94950.599071332

98735 0.572074174

097177 0.591
Average Stack Gas Velocity, feet/second 51.33 51.34 50.09 50.920 Stack Cross-Sectional Area, square feet 615.752 615.752 615.752 615.752 Dry Volumetric Flow Rate, dry scfm 1,220,179.9 1,190,588.0 1,169,465.31,193,411.0 67 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,896,393.0 1,896,762.5 1,850,581.11,881,245.5 33 Percent Isokinetic of Sampling Rate, % 102.0 105.1 104.4 103.833 Percent Excess Air, % 50.7 45.5 47.6 47.933 F-Factor, dscfm/MMBtu @ %O2 9864 9853 9807 9,841.333 Round Duct Diameter, inches 336 336 336 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 22, 2011 Page 9 of 12

### Location Stack - Method 3A CO2 Average

Run Number 1 2 3 Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:10:00 AM11:25:00 AM 6:00:00 AM Run Finish Time 10:39:00 AM 4:12:00 PM10:27:00 AM Carbon Dioxide, % 0 0 0 0.000 Oxygen, % 0 0 0 0.000 Fuel Factor 0 0 0 Dry Volumetric Flow Rate, dry scfm 0 0 0 0.000 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Moisture, % 0 0 0 0.000 Analyzer Make Servomex Servomex Servomex Analyzer Model 01440D 01440D 01440D Analyzer Serial Number 4326 4326 4326 4,326.000 Operating Range 20 20 20 20.000 Operating Units % % % No. Readings/Avg. 1 1 1 1.000 Calibration Set 1 1 1 1.000 Calibration Pre Zero Cylinder ID CC0000000 CC0000000 CC0000000 Calibration Pre Zero Cylinder Instrument Response 0.08 0.07 0.09 0.080 Calibration Pre Zero Cylinder Bias 0.48 0.43 0.54 0.483 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID CC205369ACC205369A CC205369A Calibration Pre High Cylinder Instrument Response 10.02 9.95 9.8 9.923 Calibration Pre High Cylinder Bias 1.55 1.18 0.37 1.033 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID CC0000000 CC0000000 CC0000000 Calibration Post Zero Cylinder Instrument Response 0.08 0.06 0.115 0.085 Calibration Post Zero Cylinder Bias 0.48 0.37 0.67 0.507 Calibration Post Zero Cylinder Drift 0 0.06 0.13 0.063 Calibration Post High Cylinder ID CC205369ACC205369A CC205369A Calibration Post High Cylinder Instrument Response 9.89 10.13 9.79 9.937 Calibration Post High Cylinder Bias 0.86 2.14 0.32 1.107 Calibration Post High Cylinder Drift 0.69 0.96 0.05 0.567 Cavg 11.83 12.49 11.91 12.077 Cavg Units %vd %vd %vd Cgas 11.6608 12.207 11.9385 11.935 Cgas Units %vd %vd %vd Fuel Type Fw 0 0 0 0.000 Fc 0 0 0 0.000 Cgasw 0 0 0 0.000 Cgasw Units



### Tuesday, February 22, 2011 Page 10 of 12

### Location Stack - Method 3A O2 Average

Run Number 1 2 3 Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:10:00 AM11:25:00 AM 6:00:00 AM Run Finish Time 10:39:00 AM 4:12:00 PM10:27:00 AM Carbon Dioxide, % 0 0 0 0.000 Oxygen, % 0 0 0 0.000 Fuel Factor 0 0 0 Dry Volumetric Flow Rate, dry scfm 1275007 1255617 12350231,255,215.6 67 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 12.6 12.8 12.3 12.567 Analyzer Make Servomex Servomex Servomex Analyzer Model 01440D 01440D 01440D Analyzer Serial Number 4326 4326 4623 4,425.000 Operating Range 25 25 25 25.000 Operating Units % % % No. Readings/Avg. 1 1 1 1.000 Calibration Set 0 0 0 0.000 Calibration Pre Zero Cylinder ID CC0000000 CC0000000 CC0000000 Calibration Pre Zero Cylinder Instrument Response -0.06 0.04 -0.07 -0.030 Calibration Pre Zero Cylinder Bias -0.55 -0.09 -0.59 -0.410 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID CC205369 CC205369 CC205369 Calibration Pre High Cylinder Instrument Response 11.77 11.86 11.93 11.853 Calibration Pre High Cylinder Bias -0.41 0 0.32 -0.030 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID CC0000000 CC0000000 CC0000000 Calibration Post Zero Cylinder Instrument Response 0.04 0.13 0.05 0.073 Calibration Post Zero Cylinder Bias -0.09 0.32 -0.05 0.060 Calibration Post Zero Cylinder Drift 0.46 0.41 0.54 0.470 Calibration Post High Cylinder ID CC205369 CC205369 CC205369 Calibration Post High Cylinder Instrument Response 11.82 11.86 11.92 11.867 Calibration Post High Cylinder Bias -0.18 0 0.27 0.030 Calibration Post High Cylinder Drift 0.23 0 0.05 0.093 Cavg 7.09 6.68 6.9 6.890 Cavg Units %vd %vd %vd Cgas 7.1752 6.6818 6.9071 6.921 Cgas Units %vd %vd %vd Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000 Cgasw 0 0 0 0.000 Cgasw Units



### Tuesday, February 22, 2011 Page 11 of 12

### Location Stack - Method 5/OTM-28 Average

Run Number M5B/OTM28- 1 M5B/OTM2

8-2M5B/OTM28

-3 Test Date 5/10/2010 5/10/2010 5/11/2010 Run Start Time 6:13:00 AM11:25:00 AM 6:00:00 AM Run Finish Time 10:40:00 AM 4:13:00 PM10:28:00 AM Net Traversing Points 52 52 52 Net Run Time, minutes 240 240 240 Nozzle Diameter, inches 0.277 0.277 0.277 0.277 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.991 0.991 0.991 0.991 Barometric Pressure, inches of Mercury 23.8 23.8 23.8 23.800 Average Orifice Meter Differential, inches H2O 1.97 1.91 1.85 1.910 Dry Gas Meter Volume Sampled, cubic feet 235.776 231.360 227.774 231.637 Average Dry Gas Meter Temperature, °F 70.93 65.82 68.18 68.310 Dry Gas Meter Volume Sampled, dscf 185.960 184.217 180.518 183.565 Total Moisture Liquid collected, g 571.3 573.8 539.1 561.400 Volume of Water Vapor, standard cubic feet 26.89 27.01 25.38 26.427 Moisture Content of Stack Gas, % 12.63 12.79 12.33 12.583 Moisture Saturation at Stack Gas Temperature, % 14.47 14.43 14.31 14.403 Dry Mole Fraction 0.8737 0.8721 0.8767 0.874 Carbon Dioxide, % 11.7 12.2 12 11.967 Oxygen, % 7.2 6.7 6.9 6.933 Carbon Monoxide & Nitrogen, % 81.1 81.1 81.1 81.100 Fuel Factor 1.17 1.16 1.17 Dry Molecular Weight, lb/lb-Mole 30.16 30.22 30.20 30.193 Wet Molecular weight, lb/lb-Mole 28.62 28.66 28.70 28.660 Flue Gas Static Pressure, inches of H2O -0.4 -0.3 -0.3 -0.333 Absolute Flue Gas Pressure, inches of Mercury 23.77 23.78 23.78 23.777 Average Stack Gas Temperature, °F 119.98 119.90 119.58 119.820 Average Velocity Head, inches of H2O 0.5179229648 29780.502645388

8244 0.487176014

517189 0.503
Average Stack Gas Velocity, feet/second 47.72 46.96 46.19 46.957 Stack Cross-Sectional Area, square feet 615.752 615.752 615.752 615.752 Dry Volumetric Flow Rate, dry scfm 1,114,059.4 1,094,920.4 1,083,245.41,097,408.4 00 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,763,021.1 1,734,942.8 1,706,495.11,734,819.6 67 Percent Isokinetic of Sampling Rate, % 102.3 103.1 102.2 102.533 Percent Excess Air, % 50.7 45.5 47.6 47.933 F-Factor, dscfm/MMBtu @ %O2 9864 9853 9807 9,841.333 Round Duct Diameter, inches 336 336 336 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 22, 2011 Page 12 of 12