### Name: Steve Mills

Title: Designated Representative Company: Public Service Company Colorado Sign Date: 6/25/2010 Name: Patrick Clark Title: Owner Company:Airtech Environmental Services Sign Date: 6/25/2010 Permitted Facility Representative / Date Testing Company Representative / Date 

## Cherokee Unit 3 2010 HAP 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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### Cherokee Unit 3 2010 HAP ICR 6/25/2010 Facility Information: Cherokee 6198 Franklin Street

Denver CO80216 Contact:Chad Campbell Phone:303-294-2111 Fax: 303-294-2859 Email: chad.campbell@xcelenergy.com Testing Company: Airtech Environmental Services, Inc. 5776 Lamar Street

Arvada CO80002 Contact:Patrick Clark Phone:303-670-0530 Fax: 303-670-4130 Email:pclark@airtechenv.com

Air Permit Number: 96OPAD130 Permitted Source ID/Name: Unit 3 Boiler 3 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: Cherokee Station Unit 3 is a front wall fired boiler with low Nox burners and overfired air. The unit is equipped with a spray dryer absorber (SDA) to control SO2 emissions and an FFDC to control PM emissions. The unit typically fires Colorado bituminous coal.

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. Per discussion with Peter Westlin on January 22, 2010, a three point traverse was approved since there are no Industry/SCC/NAIS221112

Sampling Location Information:

Test Parameter Information: AFS #:001.00001.003 FRS #:

SCC / Description10100202 External Combustion Boilers - Electric Generation - Bituminous/Subbituminous Coal - Pulverized Coal: Dry Bottom (Bituminous 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 Duct 0 307.58 48.7 1 128.16 3 90 222.5

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location Hydrogen Fluoride Method 26A 3 180 0 Duct Hydrogen Chloride Method 26A 3 180 0 Duct



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### Cherokee Unit 3 2010 HAP ICR 6/25/2010 entrained water droplets in the flue gas. Sampling was conducted at a constant rate of 0.75 cfm and utilized the Method 26 impingers.



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### Cherokee Unit 3 2010 HAP ICR 6/25/2010

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### Cherokee Unit 3 2010 HAP ICR 6/25/2010 Sampling / Stack Data Results Summary 

### LocationDuct - Method 26A Average Run Number 1 2 3 Test Date 3/25/2010 3/25/2010 3/25/2010 Run Start Time 6:27:00 AM 9:46:00 AM 1:02:00 PM
Run Finish Time 9:27:00 AM 12:46:00 PM 4:02:00 PM
Net Run Time, minutes Dry Gas Meter Volume Sampled, dscf 117.795 114.734 115.907 116.145 Moisture Content of Stack Gas, % 10.85 9.80 11.26 10.637 Moisture Saturation at Stack Gas Temperature, % 46.99 48.40 48.04 47.810 Carbon Dioxide, % 12 11.8 11.7 11.833 Oxygen, % 7 7.2 7.3 7.167 Average Stack Gas Temperature, °F 168.11 169.39 169.06 168.853 Dry Volumetric Flow Rate, dry scfm 400,067.7 395,583.3 399,377.9 398,342.967 Actual Wet Volumetric Flue Gas Flow Rate, acfm 644,056.4 630,706.3 646,893.3 640,552.000 Percent Isokinetic of Sampling Rate, % F-Factor, dscfm/MMBtu @ %O2 9560 9637 9624 9,607.000 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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### Cherokee Unit 3 2010 HAP ICR 6/25/2010 Emissions Summary

Process Run Data 

### Location: Duct - Method 26A Compound: Hydrogen Chloride Average RunNumber 1 2 3 Mass_mg 0.895 0.718 1.68 1.098 lb/mmBtuO2 2.41E-04 2.03E-04 4.73E-04 0.000 

### Compound: Hydrogen Fluoride Average RunNumber 1 2 3 Mass_mg 0.549 0.512 0.542 0.534 lb/mmBtuO2 1.48E-04 1.45E-04 1.52E-04 0.000



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### Cherokee Unit 3 2010 HAP ICR 6/25/2010 Process Run Data

APCD Run Data

Process Lab Run Data 

### Run Name Value UOM Comments Target Value 1 Gross Load 144.14 MW 0 

### 1 Heat Input 1594.7MMBTU/HR 0 1 Main Steam Flow 1123.1 KPPH 0 1 Flue Gas Flow Rate 25655 KWSCFH 0 

### 1 SDA Total Slurry Flow 107.75 GPM 0 1 SDA Pressure Drop 1.96 in H2O 0 1 Coal Flow 153.04 KPPH 0 

### 1 SDA SO2 Setpoint 0.11 LB/MMBTU 0.12 2 Gross Load 139.36 MW 0 2 Heat Input 1559.3MMBTU/HR 0 

### 2 Main Steam Flow 1090.7 KPPH 0 2 Flue Gas Flow Rate 25662 KWSCFH 0 2 SDA Total Slurry Flow 110.72 GPM 0 

### 2 SDA Pressure Drop 1.68 in H2O 0 2 Coal Flow 153.63 KPPH 0 2 SDA SO2 Setpoint 0.11 LB/MMBTU 0.12 

### 3 Gross Load 139.9 MW 0 3 Heat Input 1585.4MMBTU/HR 0 3 Main Steam Flow 1094.3 KPPH 0 

### 3 Flue Gas Flow Rate 26277 KWSCFH 0 3 SDA Total Slurry Flow 114.68 GPM 0 3 SDA Pressure Drop 1.77 in H2O 0 

### 3 Coal Flow 156.01 KPPH 0 3 SDA SO2 Setpoint 0.11 LB/MMBTU 0.12 

### 1 Heat Input 0 Million Btus/million BTU using CO2 0

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

### 1 DRY SCRUBBER 0 0 1 BAGHOUSE 0 0



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### Cherokee Unit 3 2010 HAP ICR 6/25/2010

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### Cherokee Unit 3 2010 HAP ICR 6/25/2010 Sampling / Stack Data Results Detail 

### LocationDuct - Method 26A Average Run Number 1 2 3 Test Date 3/25/2010 3/25/2010 3/25/2010 Run Start Time 6:27:00 AM9:46:00 AM 1:02:00 PM Run Finish Time 9:27:00 AM12:46:00 PM 4:02:00 PM Net Traversing Points 18 18 18 Net Run Time, minutes Nozzle Diameter, inches Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.0045 1.0045 1.0045 1.005 Barometric Pressure, inches of Mercury 24.83 24.83 24.83 24.830 Average Orifice Meter Differential, inches H2O 1.90 1.90 1.90 1.900 Dry Gas Meter Volume Sampled, cubic feet 142.970 139.910 143.930 142.270 Average Dry Gas Meter Temperature, °F 77.22 79.75 89.64 82.203 Dry Gas Meter Volume Sampled, dscf 117.795 114.734 115.907 116.145 Total Moisture Liquid collected, g 304.5 265 312.2 293.900 Volume of Water Vapor, standard cubic feet 14.33 12.47 14.70 13.833 Moisture Content of Stack Gas, % 10.85 9.80 11.26 10.637 Moisture Saturation at Stack Gas Temperature, % 46.99 48.40 48.04 47.810 Dry Mole Fraction 0.8915 0.902 0.8874 0.894 Carbon Dioxide, % 12 11.8 11.7 11.833 Oxygen, % 7 7.2 7.3 7.167 Carbon Monoxide & Nitrogen, % 81 81 81 81.000 Fuel Factor 1.16 1.16 1.16 Dry Molecular Weight, lb/lb-Mole 30.20 30.18 30.16 30.180 Wet Molecular weight, lb/lb-Mole 28.88 28.99 28.79 28.887 Flue Gas Static Pressure, inches of H2O -0.4 -0.4 -0.4 -0.400 Absolute Flue Gas Pressure, inches of Mercury 24.80 24.80 24.80 24.800 Average Stack Gas Temperature, °F 168.11 169.39 169.06 168.853 Average Velocity Head, inches of H2O 1.3175412522 28011.265548694

621061.322843089

94682 1.302 Average Stack Gas Velocity, feet/second 77.19 75.59 77.53 76.770 Stack Cross-Sectional Area, square feet 139.063 139.063 139.063 139.063 Dry Volumetric Flow Rate, dry scfm 400,067.7 395,583.3 399,377.9398,342.967 Actual Wet Volumetric Flue Gas Flow Rate, acfm 644,056.4 630,706.3 646,893.3640,552.000 Percent Isokinetic of Sampling Rate, % Percent Excess Air, % 48.7 50.8 51.8 50.433 F-Factor, dscfm/MMBtu @ %O2 9560 9637 96249,607.000 Round Duct Diameter, inches 0 0 0 Rectangular Duct Width, inches 90 90 90 Rectangular Duct Length, inches 222.5 222.5 222.5 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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