### Name: Steve Mills

Title: Designated Representative Company: Public Service Company of Colorado Sign Date: 6/18/2010 Name: Patrick Clark Title: Owner Company: Airtech Environmental Services Sign Date: 6/18/2010 Permitted Facility Representative / Date Testing Company Representative / Date 

## Comanche Unit 2 2010 MACT ICR

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.

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### Comanche Unit 2 2010 MACT ICR 6/18/2010 Facility Information: Comanche 2005 Lime Road

Pueblo CO 81006 Contact: Chad Campbell Phone: 303-294-2111 Fax: 303-294-2859 Email: chad.campbell@xcelenergy.com Testing Company: Airtech Environmental Services, Inc. 5776 Lamar St.

Arvada CO 80002 Contact: Patrick Clark Phone: 303-670-0530 Fax: 303-670-4130 Email: pclark@airtechenv.com

Air Permit Number: 96OPPB133 Permitted Source ID/Name: Unit 2 Boiler 2 Permitted Maximum Process Rate: Max. Normal Operation Process Rate: Target Process Test Rate

Description of the source (including control equipment). Please see the attachments for source or process flow diagram: Source is a B&W Opposed Wall Fired pulverized coal boiler with Low NOx Burners and seperated over-fire air for NOx control, a spray dryer absorber for SO2 control, Activated Carbon Injection for Hg control and a baghouse (FFDC) for particulate control. Industry/SCC/NAIS 221112

Sampling Location Information:

Test Parameter Information: AFS #: 101.0003.002 FRS #:

SCC / Description 10100222 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 280.92 12.8 6.4 4 0 0 0 0

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location Total Particulate OTM - 27/28 3 240 0 Stack Filterable PM2.5 OTM - 27/28 3 240 0 Stack Filterable Particulate Method 29 3 240 0 Stack Cadmium Method 29 3 240 0 Stack Beryllium Method 29 3 240 0 Stack Regulation Description Compound Limit Unit Colorado Operating Permit 96OPPB133, Condition 1.1 Total Particulate 0.1 lb/million BTU using CO2



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### Comanche Unit 2 2010 MACT ICR 6/18/2010

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.

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



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### Comanche Unit 2 2010 MACT ICR 6/18/2010 Sampling / Stack Data Results Summary 

### Location Stack - Method 29 Average Run Number 1 2 3 Test Date 3/16/2010 3/17/2010 3/19/2010 Run Start Time 9:23:00 AM 6:49:00 AM 6:40:00 AM

Run Finish Time 4:09:00 PM 1:22:00 PM 12:59:00 PM Net Run Time, minutes Dry Gas Meter Volume Sampled, dscf 145.974 151.857 139.791 145.874 Moisture Content of Stack Gas, % 13.47 13.40 12.10 12.990 Moisture Saturation at Stack Gas Temperature, % 53.84 58.35 50.03 54.073 Carbon Dioxide, % 12.9 12.1 12.8 12.600 Oxygen, % 6.4 7 6.7 6.700 Average Stack Gas Temperature, °F 174.56 177.92 170.69 174.390 Dry Volumetric Flow Rate, dry scfm 909,344.0 943,748.7 860,748.9 904,613.867 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,506,125.7 1,577,661.5 1,415,737.5 1,499,841.56 7 Percent Isokinetic of Sampling Rate, % F-Factor, dscfm/MMBtu @ %O2 9566 9552 9591 9,569.667 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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### Comanche Unit 2 2010 MACT ICR 6/18/2010 Location Stack - OTM - 27/28 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



### Friday, February 18, 2011 Page 5 of 11

### Comanche Unit 2 2010 MACT ICR 6/18/2010 Emissions Summary 

### Location: Stack - Method 29 Compound: Antimony Average RunNumber 1 2 3 Mass_mg 0.002937 0.001015 0.00133 0.002 lb/mmBtuO2 6.12E-07 2.12E-07 2.96E-07 0.000 

### Compound: Arsenic Average RunNumber 1 2 3 Mass_mg 0.001613 0.00175 0.00186 0.002 lb/mmBtuO2 3.36E-07 3.65E-07 4.14E-07 0.000 

### Compound: Beryllium Average RunNumber 1 2 3 Mass_mg 0.000138 0.000128 0.000165 0.000 lb/mmBtuO2 2.87E-08 2.67E-08 3.67E-08 0.000 

### Compound: Cadmium Average RunNumber 1 2 3 Mass_mg 0.000459 0.000286 0.000455 0.000 lb/mmBtuO2 9.56E-08 5.96E-08 1.01E-07 0.000 

### Compound: Chromium Average RunNumber 1 2 3 Mass_mg 0.007917 0.007323 0.005876 0.007 lb/mmBtuO2 1.65E-06 1.53E-06 1.31E-06 0.000 

### Compound: Cobalt Average RunNumber 1 2 3 Mass_mg 0.00158 0.00153 0.00115 0.001 lb/mmBtuO2 3.29E-07 3.19E-07 2.56E-07 0.000 

### Compound: Filterable Particulate Average RunNumber 1 2 3 Mass_mg 6.5 5.2 5.3 5.667 lb/mmBtuO2 1.35E-03 1.08E-03 1.18E-03 0.001 

### Compound: Lead Average RunNumber 1 2 3 Mass_mg 0.003185 0.003039 0.003349 0.003 lb/mmBtuO2 6.63E-07 6.34E-07 7.46E-07 0.000 

### Compound: Manganese Average


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### Comanche Unit 2 2010 MACT ICR 6/18/2010

Process Run Data RunNumber 1 2 3 Mass_mg 0.00575 0.00568 0.006307 0.006 lb/mmBtuO2 1.20E-06 1.18E-06 1.40E-06 0.000 

### Compound: Nickel Average RunNumber 1 2 3 Mass_mg 0.001631 0.002355 0.002097 0.002 lb/mmBtuO2 3.40E-07 4.91E-07 4.67E-07 0.000 

### Compound: Selenium Average RunNumber 1 2 3 Mass_mg 0.000785 0.000976 0.00122 0.001 lb/mmBtuO2 1.63E-07 2.04E-07 2.72E-07 0.000



### Location: Stack - OTM - 27/28 Compound: Filterable PM2.5 Average RunNumber 1 2 3 Mass_mg 2.8 2.2 0.9 1.967 lb/mmBtuO2 6.43E-04 5.48E-04 2.10E-04 0.000 

### Compound: Total Particulate Average RunNumber 1 2 3 Mass_mg 167 19.1 30.5 72.200 lb/mmBtuO2 3.84E-02 4.75E-03 7.12E-03 0.017



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### Comanche Unit 2 2010 MACT ICR 6/18/2010 Process Run Data

APCD Run Data

Process Lab Run Data 

### Run Name Value UOM Comments Target Value 1 Heat Input 375.7 Million Btus/million BTU using CO2 0 

### 1 Gross load 363.29 MW 1 Spray dryer absorber pressure drop 1.44 " wc 1 Spray dryer absorber slurry flow 282.1 gpm 

### 1 Main Steam Flow 2715.8 KPPH 0 1 Heat Input 3403.1 MMBtu/hr 0 1 Flue Gas Flow Rate 53428 KSCFH 0 

### 1 SO2 Control Setpoint 0.04 lb/MMBtu 0.1 2 Heat Input 368.88 Million Btus/million BTU using CO2 0 2 Gross load 361.68 MW 

### 2 Spray dryer absorber pressure drop 1.45 " wc 2 Spray dryer absorber slurry flow 278.6 gpm 2 Main Steam Flow 2704.9 KPPH 0 

### 2 Heat Input 3361.7 MMBtu/hr 0 2 Flue Gas Flow Rate 54359 KSCFH 0 2 SO2 Control Setpoint 0.04 lb/MMBtu 0.1 

### 3 Heat Input 355.16 Million Btus/million BTU using CO2 0 3 Gross load 332.69 MW 3 Spray dryer absorber pressure drop 1.2 " wc 

### 3 Spray dryer absorber slurry flow 180.14 gpm 3 Main Steam Flow 2482.4 KPPH 0 3 Heat Input 3078 MMBtu/hr 0 

### 3 Flue Gas Flow Rate 49425 KSCFH 0 3 SO2 Control Setpoint 0.04 lb/MMBtu 0.1 

### 1 Hg Injection Feedrate 65.56 lb/hr 0

Run Name Value UOM Comments Target Value 1 LOW NOX BURNERS 0 0 1 OVERFIRE AIR 0 0 

### 1 DRY SCRUBBER 0 1 ACTIVATED CARBON ADSORPTION 0 0 1 BAGHOUSE 0 0



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### Comanche Unit 2 2010 MACT ICR 6/18/2010 Process Lab Run Data



### Friday, February 18, 2011 Page 9 of 11

### Comanche Unit 2 2010 MACT ICR 6/18/2010 Sampling / Stack Data Results Detail 

### Location Stack - Method 29 Average Run Number 1 2 3 Test Date 3/16/2010 3/17/2010 3/19/2010 Run Start Time 9:23:00 AM 6:49:00 AM 6:40:00 AM Run Finish Time 4:09:00 PM 1:22:00 PM 12:59:00 PM Net Traversing Points 36 36 36 Net Run Time, minutes Nozzle Diameter, inches Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.9888 0.9888 0.9888 0.989 Barometric Pressure, inches of Mercury 25.13 25.01 24.76 24.967 Average Orifice Meter Differential, inches H2O 0.67 0.74 0.61 0.673 Dry Gas Meter Volume Sampled, cubic feet 178.160 186.520 170.680 178.453 Average Dry Gas Meter Temperature, °F 76.24 77.19 68.47 73.967 Dry Gas Meter Volume Sampled, dscf 145.974 151.857 139.791 145.874 Total Moisture Liquid collected, g 482.6 499.1 408.8 463.500 Volume of Water Vapor, standard cubic feet 22.72 23.49 19.24 21.817 Moisture Content of Stack Gas, % 13.47 13.40 12.10 12.990 Moisture Saturation at Stack Gas Temperature, % 53.84 58.35 50.03 54.073 Dry Mole Fraction 0.8653 0.866 0.879 0.870 Carbon Dioxide, % 12.9 12.1 12.8 12.600 Oxygen, % 6.4 7 6.7 6.700 Carbon Monoxide & Nitrogen, % 80.7 80.9 80.5 80.700 Fuel Factor 1.12 1.15 1.11 Dry Molecular Weight, lb/lb-Mole 30.32 30.22 30.32 30.287 Wet Molecular weight, lb/lb-Mole 28.66 28.58 28.83 28.690 Flue Gas Static Pressure, inches of H2O -0.6 -0.6 -0.6 -0.600 Absolute Flue Gas Pressure, inches of Mercury 25.09 24.97 24.72 24.927 Average Stack Gas Temperature, °F 174.56 177.92 170.69 174.390 Average Velocity Head, inches of H2O 0.7473842490 05739 0.809707161

692999 0.658445131

34035 0.739 Average Stack Gas Velocity, feet/second 58.32 61.09 54.82 58.077 Stack Cross-Sectional Area, square feet 430.420 430.420 430.420 430.420 Dry Volumetric Flow Rate, dry scfm 909,344.0 943,748.7 860,748.9 904,613.867 Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,506,125.7 1,577,661.5 1,415,737.5 1,499,841.5 67 Percent Isokinetic of Sampling Rate, % Percent Excess Air, % 42.9 48.8 46.0 45.900 F-Factor, dscfm/MMBtu @ %O2 9566 9552 9591 9,569.667 Round Duct Diameter, inches 280.92 280.92 280.92 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



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### Comanche Unit 2 2010 MACT ICR 6/18/2010 Location Stack - OTM - 27/28 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



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