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 2 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 2 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.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:

2 Unit 2 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 2 is a top fired boiler with underfired air. The unit is equipped with a dry sorbent injection 

system (uses 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 #: 001.00001.002 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 0 215.3 97.5 134.2 353 228 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 2 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 2 2010 HAP ICR

6/30/2010

Friday, February 18, 2011 Page 4 of 7
Cherokee Unit 2 2010 HAP ICR

6/30/2010

Sampling / Stack Data Results Summary

Location Duct - Method 26A

Average

Run Number 1 2 3

Test Date 4/8/2010 4/8/2010 4/8/2010

Run Start Time 7:25:00 AM 10:39:00 

AM

2:23:00 PM

Run Finish Time 10:25:00 AM 1:39:00 PM 5:23:00 PM

Net Run Time, minutes

Dry Gas Meter Volume Sampled, dscf 116.714 114.996 112.725 114.812

Moisture Content of Stack Gas, % 7.91 7.85 7.87 7.877

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

Carbon Dioxide, % 13.2 13.4 13.6 13.400

Oxygen, % 5.3 5.3 4.9 5.167

Average Stack Gas Temperature, °F 273.61 281.56 288.17 281.113

Dry Volumetric Flow Rate, dry scfm 257,579.9 252,508.0 255,461.3 255,183.067

Actual Wet Volumetric Flue Gas Flow Rate, acfm 468,290.8 463,742.6 473,451.3 468,494.900

Percent Isokinetic of Sampling Rate, %

F-Factor, dscfm/MMBtu @ %O2 9733 9724 9773 9,743.333

Fw 0 0 0 0.000

Fc 0 0 0 0.000

Friday, February 18, 2011 Page 5 of 7
Cherokee Unit 2 2010 HAP ICR

6/30/2010

Emissions Summary

Process Run Data

Location: Duct - Method 26A

Compound: Hydrogen Chloride

Average

RunNumber 1 2 3

Mass_mg 0.81 0.741 0.699 0.750

lb/mmBtuO2 2.00E-04 1.85E-04 1.75E-04 0.000

Compound: Hydrogen Fluoride

Average

RunNumber 1 2 3

Mass_mg 2.83 2.72 3.09 2.880

lb/mmBtuO2 6.97E-04 6.79E-04 7.71E-04 0.001

Friday, February 18, 2011 Page 6 of 7
Cherokee Unit 2 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 112.64 MW 0

1 Heat Input 1220.5 MMBTU/HR 0

1 Main Steam Flow 951.67 % 0

1 Flue Gas Flow Rate 17531 KWSCFH 0

1 DSI Injection Rate 51 % 0

1 Coal Flow 118.89 KPPH 0

1 SO2 Control Setpoint 0.5 LB/MMBTU 0.6

2 Gross Load 112.5 MW 0

2 Heat Input 1233.5 MMBTU/HR 0

2 Main Steam Flow 963.11 % 0

2 Flue Gas Flow Rate 17431 KWSCFH 0

2 DSI Injection Rate 51 % 0

2 Coal Flow 119.89 KPPH 0

2 SO2 Control Setpoint 0.5 LB/MMBTU 0.6

3 Gross Load 111.89 MW 0

3 Heat Input 1246.9 MMBTU/HR 0

3 Main Steam Flow 958.19 % 0

3 Flue Gas Flow Rate 17637 KWSCFH 0

3 DSI Injection Rate 51 % 0

3 Coal Flow 124.82 KPPH 0

3 SO2 Control 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 OVERFIRE AIR 0 0

1 DRY SORBENT INJECTION 0 0

1 BAGHOUSE 0 0

Friday, February 18, 2011 Page 7 of 7
Cherokee Unit 2 2010 HAP ICR

6/30/2010

Sampling / Stack Data Results Detail

Location Duct - Method 26A

Average

Run Number 1 2 3

Test Date 4/8/2010 4/8/2010 4/8/2010

Run Start Time 7:25:00 AM 10:39:00 AM 2:23:00 PM

Run Finish Time 10:25:00 AM 1:39:00 PM 5:23:00 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 0.9888 0.9888 0.9888 0.989

Barometric Pressure, inches of Mercury 24.79 24.79 24.79 24.790

Average Orifice Meter Differential, inches H2O 1.70 1.70 1.70 1.700

Dry Gas Meter Volume Sampled, cubic feet 140.220 142.020 141.440 141.227

Average Dry Gas Meter Temperature, °F 62.31 76.92 85.50 74.910

Dry Gas Meter Volume Sampled, dscf 116.714 114.996 112.725 114.812

Total Moisture Liquid collected, g 212.8 208.3 204.5 208.533

Volume of Water Vapor, standard cubic feet 10.02 9.80 9.63 9.817

Moisture Content of Stack Gas, % 7.91 7.85 7.87 7.877

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

Dry Mole Fraction 0.9209 0.9215 0.9213 0.921

Carbon Dioxide, % 13.2 13.4 13.6 13.400

Oxygen, % 5.3 5.3 4.9 5.167

Carbon Monoxide & Nitrogen, % 81.5 81.3 81.5 81.433

Fuel Factor 1.18 1.16 1.18

Dry Molecular Weight, lb/lb-Mole 30.32 30.36 30.37 30.350

Wet Molecular weight, lb/lb-Mole 29.35 29.39 29.40 29.380

Flue Gas Static Pressure, inches of H2O 0.5 0.5 0.5 0.500

Absolute Flue Gas Pressure, inches of Mercury 24.83 24.83 24.83 24.830

Average Stack Gas Temperature, °F 273.61 281.56 288.17 281.113

Average Velocity Head, inches of H2O 0.5522871177

18571

0.536485624

063582

0.554421693

695514

0.548

Average Stack Gas Velocity, feet/second 53.54 53.02 54.13 53.563

Stack Cross-Sectional Area, square feet 145.776 145.776 145.776 145.776

Dry Volumetric Flow Rate, dry scfm 257,579.9 252,508.0 255,461.3 255,183.067

Actual Wet Volumetric Flue Gas Flow Rate, acfm 468,290.8 463,742.6 473,451.3 468,494.900

Percent Isokinetic of Sampling Rate, %

Percent Excess Air, % 32.7 32.8 29.5 31.667

F-Factor, dscfm/MMBtu @ %O2 9733 9724 9773 9,743.333

Round Duct Diameter, inches 0 0 0

Rectangular Duct Width, inches 97.5 97.5 97.5

Rectangular Duct Length, inches 215.3 215.3 215.3

Fw 0 0 0 0.000

Fc 0 0 0 0.000

Friday, February 18, 2011 Page 8 of 7