Name: Steve Mills

Title: Designated Representative

Company: Public Service Company of Colorado

Sign Date: 6/30/2010

Name: Patrick Clark

Title: Owner

Company: Airtech Environmental Services

Sign Date: 6/30/2010

Permitted Facility Representative / Date Testing Company Representative / Date

Cherokee Unit 1 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 7
Cherokee Unit 1 2010 HAP ICR

6/30/2010

Facility Information:

Cherokee

6198 Franklin Street

Denver CO 80216

Contact: Chad Campbell

Phone: 303-294-2111

Fax: 303-294-2859

Email: chad.campbell@xcelenergy

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:

1 Unit 1 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 1 is a top fired boiler with low Nox burners and underfired air. The unit is equipped with dry 

sorbent injection (DSI - Trona) 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 #: 001.00001.001 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 0 261 84.756 127.96 304.5 48.62 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 7
Cherokee Unit 1 2010 HAP ICR

6/30/2010

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 7
Cherokee Unit 1 2010 HAP ICR

6/30/2010

Friday, February 18, 2011 Page 4 of 7
Cherokee Unit 1 2010 HAP ICR

6/30/2010

Sampling / Stack Data Results Summary

Location Duct - Method 26A

Average

Run Number 2 3 4

Test Date 4/6/2010 4/6/2010 4/7/2010

Run Start Time 8:34:00 AM 11:53:00 

AM

9:40:00 AM

Run Finish Time 11:34:00 AM 2:53:00 PM 12:40:00 PM

Net Run Time, minutes

Dry Gas Meter Volume Sampled, dscf 120.417 117.753 118.399 118.856

Moisture Content of Stack Gas, % 7.95 8.83 12.05 9.610

Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000

Carbon Dioxide, % 12.6 12.9 13.3 12.933

Oxygen, % 6.35 6.25 5.75 6.117

Average Stack Gas Temperature, °F 328.44 331.67 332.72 330.943

Dry Volumetric Flow Rate, dry scfm 263,928.5 263,583.9 252,619.9 260,044.100

Actual Wet Volumetric Flue Gas Flow Rate, acfm 525,011.7 531,555.9 527,500.4 528,022.667

Percent Isokinetic of Sampling Rate, %

F-Factor, dscfm/MMBtu @ %O2 9859 9697 9710 9,755.333

Fw 0 0 0 0.000

Fc 0 0 0 0.000

Friday, February 18, 2011 Page 5 of 7
Cherokee Unit 1 2010 HAP ICR

6/30/2010

Emissions Summary

Process Run Data

Location: Duct - Method 26A

Compound: Hydrogen Chloride

Average

RunNumber 2 3 4

Mass_mg 1.04 0.615 0.991 0.882

lb/mmBtuO2 2.70E-04 1.59E-04 2.47E-04 0.000

Compound: Hydrogen Fluoride

Average

RunNumber 2 3 4

Mass_mg 2.64 2.48 2.37 2.497

lb/mmBtuO2 6.84E-04 6.42E-04 5.91E-04 0.001

Friday, February 18, 2011 Page 6 of 7
Cherokee Unit 1 2010 HAP ICR

6/30/2010

Process Run Data

APCD Run Data

Process Lab Run Data

Run Name Value UOM Comments

Target

Value

1 Gross Load 98.94 MW 0

1 Heat Input 1173.1 MMBTU/HR 0

1 Main Steam Flow 848.84 KPPH 0

1 Flue Gas Flow Rate 17385 KWSCFH 0

1 DSI Injection Rate 29.95 % 0

1 Coal Flow 110.15 KPPH 0

1 SDA SO2 Setpoint 0.5 LB/MMBTU 0.6

2 Gross Load 98.04 MW 0

2 Heat Input 1180.8 MMBTU/HR 0

2 Main Steam Flow 833.73 KPPH 0

2 Flue Gas Flow Rate 17642 KWSCFH 0

2 DSI Injection Rate 35 % 0

2 Coal Flow 110.83 KPPH 0

2 SDA SO2 Setpoint 0.5 LB/MMBTU 0.6

3 Gross Load 99.57 MW 0

3 Heat Input 1201.4 MMBTU/HR 0

3 Main Steam Flow 867.36 KPPH 0

3 Flue Gas Flow Rate 17568 KWSCFH 0

3 DSI Injection Rate 30 % 0

3 Coal Flow 107.11 KPPH 0

3 SDA SO2 Setpoint 0.5 LB/MMBTU 0.6

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 SORBENT INJECTION 0 0

1 BAGHOUSE 0 0

Friday, February 18, 2011 Page 7 of 7
Cherokee Unit 1 2010 HAP ICR

6/30/2010

Sampling / Stack Data Results Detail

Location Duct - Method 26A

Average

Run Number 2 3 4

Test Date 4/6/2010 4/6/2010 4/7/2010

Run Start Time 8:34:00 AM 11:53:00 AM 9:40:00 AM

Run Finish Time 11:34:00 AM 2:53:00 PM 12:40:00 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 1.0018 1.0018 0.9888 0.997

Barometric Pressure, inches of Mercury 24.38 24.38 24.44 24.400

Average Orifice Meter Differential, inches H2O 1.80 1.80 1.70 1.767

Dry Gas Meter Volume Sampled, cubic feet 145.220 143.230 143.870 144.107

Average Dry Gas Meter Temperature, °F 62.61 67.11 60.86 63.527

Dry Gas Meter Volume Sampled, dscf 120.417 117.753 118.399 118.856

Total Moisture Liquid collected, g 220.9 242.3 344.6 269.267

Volume of Water Vapor, standard cubic feet 10.40 11.41 16.22 12.677

Moisture Content of Stack Gas, % 7.95 8.83 12.05 9.610

Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000

Dry Mole Fraction 0.9205 0.9117 0.8795 0.904

Carbon Dioxide, % 12.6 12.9 13.3 12.933

Oxygen, % 6.35 6.25 5.75 6.117

Carbon Monoxide & Nitrogen, % 81.05 80.85 80.95 80.950

Fuel Factor 1.15 1.14 1.14

Dry Molecular Weight, lb/lb-Mole 30.27 30.31 30.36 30.313

Wet Molecular weight, lb/lb-Mole 29.29 29.22 28.87 29.127

Flue Gas Static Pressure, inches of H2O 0.3 0.3 0.3 0.300

Absolute Flue Gas Pressure, inches of Mercury 24.40 24.40 24.46 24.420

Average Stack Gas Temperature, °F 328.44 331.67 332.72 330.943

Average Velocity Head, inches of H2O 0.5703454148

60879

0.580714648

136191

0.565825961

879388

0.572

Average Stack Gas Velocity, feet/second 56.96 57.67 57.23 57.287

Stack Cross-Sectional Area, square feet 153.620 153.620 153.620 153.620

Dry Volumetric Flow Rate, dry scfm 263,928.5 263,583.9 252,619.9 260,044.100

Actual Wet Volumetric Flue Gas Flow Rate, acfm 525,011.7 531,555.9 527,500.4 528,022.667

Percent Isokinetic of Sampling Rate, %

Percent Excess Air, % 42.2 41.4 36.8 40.133

F-Factor, dscfm/MMBtu @ %O2 9859 9697 9710 9,755.333

Round Duct Diameter, inches 0 0 0

Rectangular Duct Width, inches 84.756 84.756 84.756

Rectangular Duct Length, inches 261 261 261

Fw 0 0 0 0.000

Fc 0 0 0 0.000

Friday, February 18, 2011 Page 8 of 7