Name: Steve Mills

Title: Designated Representative

Company: Public Service Company of 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

Cherkee Unit 4 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
Cherkee Unit 4 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:

4 Unit 4 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 4 is a 350 MW tangentially fired CE 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 #: 001.0001.004 FRS #:

SCC / Description 10100212 External Combustion Boilers - Electric Generation - Bituminous/Subbituminous 

Coal - Pulverized Coal: Dry Bottom (Tangential) (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 0 392 196 261.33 180.32 240.42 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
Cherkee Unit 4 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
Cherkee Unit 4 2010 HAP ICR

6/25/2010

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

6/25/2010

Sampling / Stack Data Results Summary

Location Duct - Method 26A

Average

Run Number 1 2 3

Test Date 3/23/2010 3/23/2010 3/24/2010

Run Start Time 7:17:00 AM 10:38:00 

AM

7:14:00 AM

Run Finish Time 10:17:00 AM 1:38:00 PM 10:14:00 AM

Net Run Time, minutes

Dry Gas Meter Volume Sampled, dscf 119.887 118.125 121.231 119.748

Moisture Content of Stack Gas, % 11.64 11.91 11.21 11.587

Moisture Saturation at Stack Gas Temperature, % 43.31 42.64 39.42 41.790

Carbon Dioxide, % 13.1 13.2 13.1 13.133

Oxygen, % 5.7 5.5 5.9 5.700

Average Stack Gas Temperature, °F 164.39 163.67 160.78 162.947

Dry Volumetric Flow Rate, dry scfm 910,807.2 908,360.1 894,178.6 904,448.633

Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,478,377.0 1,479,017.2 1,423,314.0 1,460,236.06

7

Percent Isokinetic of Sampling Rate, %

F-Factor, dscfm/MMBtu @ %O2 9633 9604 9638 9,625.000

Fw 0 0 0 0.000

Fc 0 0 0 0.000

Friday, February 18, 2011 Page 5 of 8
Cherkee Unit 4 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 1.31 0.798 0.808 0.972

lb/mmBtuO2 3.19E-04 1.94E-04 1.97E-04 0.000

Compound: Hydrogen Fluoride

Average

RunNumber 1 2 3

Mass_mg 0.542 0.512 0.542 0.532

lb/mmBtuO2 1.32E-04 1.25E-04 1.32E-04 0.000

Friday, February 18, 2011 Page 6 of 8
Cherkee Unit 4 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 333.73 MW 0

1 Heat Input 3111.9 MMBTU/HR 0

1 Main Steam Flow 1918.7 KPPH 0

1 Flue Gas Flow Rate 45739 KWSCFH 0

1 SDA Total Slurry Flow 226.13 GPM 0

1 SDA Pressure Drop 2.36 in H2O 0

1 Coal Flow 282.92 KPPH 0

1 SDA SO2 Setpoint 0.11 LB/MMBTU 0.12

2 Gross Load 332.48 MW 0

2 Heat Input 3062.0 MMBTU/HR 0

2 Main Steam Flow 1916.9 KPPH 0

2 Flue Gas Flow Rate 44701 KWSCFH 0

2 SDA Total Slurry Flow 239.74 GPM 0

2 SDA Pressure Drop 2 in H2O 0

2 Coal Flow 282.96 KPPH 0

2 SDA SO2 Setpoint 0.11 LB/MMBTU 0.12

3 Gross Load 330.29 MW 0

3 Heat Input 2956.7 MMBTU/HR 0

3 Main Steam Flow 1913.4 KPPH 0

3 Flue Gas Flow Rate 43329 KWSCFH 0

3 SDA Total Slurry Flow 202.75 GPM 0

3 SDA Pressure Drop 1.82 in H2O 0

3 Coal Flow 282.08 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
Cherkee Unit 4 2010 HAP ICR

6/25/2010

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

6/25/2010

Sampling / Stack Data Results Detail

Location Duct - Method 26A

Average

Run Number 1 2 3

Test Date 3/23/2010 3/23/2010 3/24/2010

Run Start Time 7:17:00 AM 10:38:00 AM 7:14:00 AM

Run Finish Time 10:17:00 AM 1:38:00 PM 10:14:00 AM

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 1.0018 1.002

Barometric Pressure, inches of Mercury 24.7 24.68 24.93 24.770

Average Orifice Meter Differential, inches H2O 1.80 1.80 1.80 1.800

Dry Gas Meter Volume Sampled, cubic feet 143.280 144.550 141.710 143.180

Average Dry Gas Meter Temperature, °F 64.67 76.78 57.92 66.457

Dry Gas Meter Volume Sampled, dscf 119.887 118.125 121.231 119.748

Total Moisture Liquid collected, g 335.5 339.3 325.3 333.367

Volume of Water Vapor, standard cubic feet 15.79 15.97 15.31 15.690

Moisture Content of Stack Gas, % 11.64 11.91 11.21 11.587

Moisture Saturation at Stack Gas Temperature, % 43.31 42.64 39.42 41.790

Dry Mole Fraction 0.8836 0.8809 0.8879 0.884

Carbon Dioxide, % 13.1 13.2 13.1 13.133

Oxygen, % 5.7 5.5 5.9 5.700

Carbon Monoxide & Nitrogen, % 81.2 81.3 81 81.167

Fuel Factor 1.16 1.17 1.15

Dry Molecular Weight, lb/lb-Mole 30.32 30.33 30.33 30.327

Wet Molecular weight, lb/lb-Mole 28.89 28.86 28.95 28.900

Flue Gas Static Pressure, inches of H2O -0.4 -0.5 -0.5 -0.467

Absolute Flue Gas Pressure, inches of Mercury 24.67 24.64 24.89 24.733

Average Stack Gas Temperature, °F 164.39 163.67 160.78 162.947

Average Velocity Head, inches of H2O 0.4720360214

60522

0.471949798

035324

0.444848513

755238

0.463

Average Stack Gas Velocity, feet/second 46.18 46.20 44.46 45.613

Stack Cross-Sectional Area, square feet 533.556 533.556 533.556 533.556

Dry Volumetric Flow Rate, dry scfm 910,807.2 908,360.1 894,178.6 904,448.633

Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,478,377.0 1,479,017.2 1,423,314.0 1,460,236.0

67

Percent Isokinetic of Sampling Rate, %

Percent Excess Air, % 36.2 34.5 38.1 36.267

F-Factor, dscfm/MMBtu @ %O2 9633 9604 9638 9,625.000

Round Duct Diameter, inches 0 0 0

Rectangular Duct Width, inches 196 196 196

Rectangular Duct Length, inches 392 392 392

Fw 0 0 0 0.000

Fc 0 0 0 0.000

Friday, February 18, 2011 Page 9 of 8