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.

Friday, February 18, 2011 Page 1 of 8
Cherokee Unit 3 2010 HAP ICR

6/25/2010

Facility Information:

Cherokee

6198 Franklin Street

Denver CO 80216

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 CO 80002

Contact: Patrick Clark

Phone: 303-670-0530

Fax: 303-670-4130

Email: pclark@airtechenv.com

Air Permit Number:

96OPAD130

Permitted Source ID/Name:

3 Unit 3 Boiler

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/NAIS 221112

Sampling Location Information:

Test Parameter Information:

AFS #: 001.00001.003 FRS #:

SCC / Description 10100202 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 0 222.5 90 128.16 307.58 48.7 1 3

Target

Parameter 

Test

Method

Number of

Test Runs

Test Run

Duration

Sample 

Location Points Comments

Duct Hydrogen Fluoride Method 26A 3 180 0

Duct Hydrogen Chloride Method 26A 3 180 0

Friday, February 18, 2011 Page 2 of 8
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.

Friday, February 18, 2011 Page 3 of 8
Cherokee Unit 3 2010 HAP ICR

6/25/2010

Friday, February 18, 2011 Page 4 of 8
Cherokee Unit 3 2010 HAP ICR

6/25/2010

Sampling / Stack Data Results Summary

Location Duct - 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

Friday, February 18, 2011 Page 5 of 8
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

Friday, February 18, 2011 Page 6 of 8
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 1594.7 MMBTU/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 1559.3 MMBTU/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 1585.4 MMBTU/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 Million Btus/million BTU using CO2 0 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

Friday, February 18, 2011 Page 7 of 8
Cherokee Unit 3 2010 HAP ICR

6/25/2010

Friday, February 18, 2011 Page 8 of 8
Cherokee Unit 3 2010 HAP ICR

6/25/2010

Sampling / Stack Data Results Detail

Location Duct - 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 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

2801

1.265548694

62106

1.322843089

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 400,067.7 395,583.3 399,377.9 398,342.967

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, %

Percent Excess Air, % 48.7 50.8 51.8 50.433

F-Factor, dscfm/MMBtu @ %O2 9560 9637 9624 9,607.000

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

Friday, February 18, 2011 Page 9 of 8