Name: Craig. R. Eckberg

Title: Manager, Air Resources

Company: NRG Texas Power LLC

Sign Date: 6/30/2010

Name: MarkRoach, P.E.

Title: Techical Leader, Source Groups

Company: Clean air Engineering

Sign Date: 6/30/2010

Permitted Facility Representative / Date Testing Company Representative / Date

Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

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.

Wednesday, February 23, 2011 Page 1 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

Facility Information:

Limestone

9 miles north of Jewett TX on FM 39

Jewett TX 75846

Contact: Craig R. Eckberg

Phone: 713-795-6208

Fax: 713-795-7431

Email: craig.eckberg@nrgenergy.com

Testing Company:

Clean Air Engineering, Inc.

321 Century Plaza Drive

Suite 130

Houston TX 77073

Contact:Bart DeLatte

Phone: 281-443-6400

Fax: 281-443-1806

Email: bdelatte@cleanair.com

Air Permit Number:

O75

Permitted Source ID/Name:

Unit 1 LIM1

Permitted Maximum Process Rate:

N/A

Max. Normal Operation Process Rate:

N/A

Target Process Test Rate

N/A

Description of the source (including control equipment). Please see the attachments for source or

 process flow diagram:

This description should describe the process and associated controls to differentiate this facility from, or document 

similarity with others of same SCC.

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.

Industry/SCC/NAIS 221112

Sampling Location Information:

Test Parameter Information:

AFS #: 4828900010 FRS #: 110034223668

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

Stack Exit 357 0 0 0 960 4620 4 12

Target

Parameter 

Test

Method

Number of

Test Runs

Test Run

Duration

Sample 

Location Points Comments

Stack Exit % H2O Method 1 - 4 3 120 0 Alt Method 320

Stack Exit Carbon Monoxide Method 10 3 120 0 Alt Method 320

Stack Exit Formaldehyde Method 0011 3 120 0 Alt Method 320

Total organic compounds 

(TOC) as Propane

Stack Exit Method 25A 3 120 0

Stack Exit Co2 Method 3A CO2 3 120 0

Stack Exit O2 Method 3A O2 3 120 0

Wednesday, February 23, 2011 Page 2 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

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.

The following compounds will be determined by US EPA Mehtod 320: Formaldehyde, CO, Methane, Moisture.

Described in protocol.

Wednesday, February 23, 2011 Page 3 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

Sampling / Stack Data Results Summary

Location Stack Exit - Method 25A

Average

Run Number 1 2 3

Test Date 4/20/2010 4/20/2010 4/20/2010

Run Start Time 9:50:00 AM 1:02:00 PM 3:47:00 PM

Run Finish Time 12:05:00 PM 3:23:00 PM 6:02:00 PM

Carbon Dioxide, % 14.55 14.56 14.47 14.527

Oxygen, % 5.02 5.11 5.12 5.083

Dry Volumetric Flow Rate, dry scfm 1760000 1746000 1761000 1,755,666.66

7

F-Factor, dscfm/MMBtu @ %O2 10209 10224 10179 10,204.000

Moisture, % 18.55 18.47 18.64 18.553

Fuel Type Override Override Override

Fw 11875 11875 11845 11,865.000

Fc 1910 1910 1910 1,910.000

Wednesday, February 23, 2011 Page 4 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

Emissions Summary

Process Run Data

Location: Stack Exit - Method 25A

Compound: Total organic compounds (TOC) as 

Average

Run 1 2 3

lb/mmBtuO2 1.05E-04 0.00E+00 0.00E+00 0.000

ppm 6.81E-02 0.00E+00 0.00E+00 0.023

ppm@7%O2 5.96E-02 0.00E+00 0.00E+00 0.020

Wednesday, February 23, 2011 Page 5 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

Process Run Data

Run Name Value UOM Comments

Target

Value

1 Coal Firing Rate 584.51 TPH 590

2 Coal Firing Rate 565.56 TPH 590

3 Coal Firing Rate 570.12 TPH 590

1 Average Heat Input 8645 MMBtu/hr 7870

2 Average Heat Input 8629 MMBtu/hr 7870

3 Average Heat Input 8737 MMBtu/hr 7870

1 Steam Output 6114 1000 lb steam/hr 6100

2 Steam Output 6098 1000 lb steam/hr 6100

3 Steam Output 6124 1000 lb steam/hr 6100

1 Synfuel Firing Rate 0 0

2 Synfuel Firing Rate 0 0

3 Synfuel Firing Rate 0 0

1 Petroleum Coke Firing Rate 0 0

2 Petroleum Coke Firing Rate 0 0

3 Petroleum Coke Firing Rate 0 0

1 Coal Gas Firing Rate 0 0

2 Coal Gas Firing Rate 0 0

3 Coal Gas Firing Rate 0 0

1 Fuel Oil Firing Rate 0 0

2 Fuel Oil Firing Rate 0 0

3 Fuel Oil Firing Rate 0 0

1 Flue Gas Flow Rate 2E+06 dscfm 2E+06

1 Pressure Drop Across FGD (if applicable) 0 in H20 0

1 FGD Scrubber Liquor pH 0 pH 0

1 FGD Scrubber Liquor Flow Rate 0 gal/min 0

1 Sorbent Type and Sorbent Injection Rate (if 

applicable)

0 lb/hr 0

1 Flue Gas Oxygen Content 5.02 % 5.1

1 Flue Gas Carbon Dioxide Content 14.55 % 14

1 Flue Gas Moisture Content 18.55 % 18

1 Flue Gas Sampling Point Temperature 158 Deg F 160

1 Flue Gas Pressure 0 atm 0

1 Standard Pressure 1 atm 1

1 Standard Temperature 68 Deg F 68

Wednesday, February 23, 2011 Page 6 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

APCD Run Data

Process Lab Run Data

1 Unit Gross Electrical Output 887 MW 890

1 Unit Net Electric Generation 1897 MWh 1900

Run Name Value UOM Comments

Target

Value

1 LOW NOX BURNERS 0 0

1 OVERFIRE AIR 0 0

1 SPRAY SCRUBBER 0 0

1 ELECTROSTATIC PRECIPITATOR 0 0

Run Name Value UOM Comments

1 Fuel Higher Heating Value 10312 Btu/lb

2 Fuel Higher Heating Value 10335 Btu/lb

3 Fuel Higher Heating Value 10788 Btu/lb

1 Fuel Moisture 31.19 %

2 Fuel Moisture 30.87 %

3 Fuel Moisture 31.46 %

1 Moisture as determined 13.4 %

2 Moisture as determined 15.1 %

3 Moisture as determined 14.9 %

1 Volatile Matter 41.8 %

2 Volatile Matter 41.04 %

3 Volatile Matter 42.76 %

1 Ash 18.03 %

2 Ash 15.95 %

3 Ash 14.86 %

1 Fixed Carbon 40.17 %

2 Fixed Carbon 43.01 %

3 Fixed Carbon 42.38 %

1 Carbon 62.77 %

2 Carbon 63.29 %

3 Carbon 65.26 %

1 Hydrogen 3.97 %

2 Hydrogen 3.98 %

3 Hydrogen 4.32 %

1 Nitrogen 1.07 %

2 Nitrogen 1.04 %

3 Nitrogen 1.14 %

1 Sulfur 1.12 %

Wednesday, February 23, 2011 Page 7 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

2 Sulfur 1.4 %

3 Sulfur 0.69 %

1 Oxygen 13.04 %

2 Oxygen 14.34 %

3 Oxygen 13.73 %

Wednesday, February 23, 2011 Page 8 of 9
Utility Boiler MACT ICR Testing Unit 1 Limestone Generating Station

6/30/2010

Sampling / Stack Data Results Detail

Location Stack Exit - Method 25A

Average

Run Number 1 2 3

Test Date 4/20/2010 4/20/2010 4/20/2010

Run Start Time 9:50:00 AM 1:02:00 PM 3:47:00 PM

Run Finish Time 12:05:00 PM 3:23:00 PM 6:02:00 PM

Carbon Dioxide, % 14.55 14.56 14.47 14.527

Oxygen, % 5.02 5.11 5.12 5.083

Fuel Factor 1.09 1.08 1.09

Dry Volumetric Flow Rate, dry scfm 1760000 1746000 1761000 1,755,666.6

67

F-Factor, dscfm/MMBtu @ %O2 10209 10224 10179 10,204.000

Moisture, % 18.55 18.47 18.64 18.553

Analyzer Make JUM JUM JUM

Analyzer Model 3-300A 3-300A 3-300A

Analyzer Serial Number

Operating Range 82.98 82.98 82.98 82.980

Operating Units ppm ppm ppm

No. Readings/Avg. 60 60 60 60.000

Calibration Set 0 0 0 0.000

Calibration Pre Zero Cylinder ID cc79769 cc79769 cc79769

Calibration Pre Zero Cylinder Instrument Response 0.018 -0.028 0.027 0.006

Calibration Pre Zero Cylinder Bias -0.12 -0.06 -0.11 -0.097

Calibration Pre Zero Cylinder Drift 0 0 0 0.000

Calibration Pre High Cylinder ID alm060394 alm060394 alm060394

Calibration Pre High Cylinder Instrument Response 25.828 25.069 24.939 25.279

Calibration Pre High Cylinder Bias 0.48 -0.91 -0.59 -0.340

Calibration Pre High Cylinder Drift 0 0 0 0.000

Calibration Post Zero Cylinder ID cc79769 cc79769 cc79769

Calibration Post Zero Cylinder Instrument Response -0.028 0.027 -0.111 -0.037

Calibration Post Zero Cylinder Bias -0.18 0.01 -0.28 -0.150

Calibration Post Zero Cylinder Drift 0.06 0.07 0 0.043

Calibration Post High Cylinder ID alm060394 alm060394 alm060394

Calibration Post High Cylinder Instrument Response 25.069 24.939 24.779 24.929

Calibration Post High Cylinder Bias -0.43 -1.07 -0.78 -0.760

Calibration Post High Cylinder Drift 0.91 0.16 0.19 0.420

Cavg 0.051 -0.083 -0.155 -0.062

Cavg Units ppmvw ppmvw ppmvw

Cgas 0.0681 0 0 0.023

Cgas Units ppmvd ppmvd ppmvd

Fuel Type Override Override Override

Fw 11875 11875 11845 11,865.000

Fc 1910 1910 1910 1,910.000

Cgasw 5.5442277093

5235E-02

0 0 0.018

Cgasw Units ppmvw ppmvw ppmvw

Wednesday, February 23, 2011 Page 9 of 9