Name: Craig R. Ecberg

Title: Manager, Air Resources

Company: NRG Texas Power LLC

Sign Date: 6/30/2010

Name: Mark Roach, P.E.

Title: Technical Director, Source Group

Company: Clean air Engineering, Inc.

Sign Date: 6/30/2010

Permitted Facility Representative / Date Testing Company Representative / Date

Utility Boiler MACT ICR Testing Unit 2 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 8
Utility Boiler MACT ICR Testing Unit 2 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@clenaair.com

Air Permit Number:

O75

Permitted Source ID/Name:

Unit 2 LIM2

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:

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 O2 Method 3A O2 3 120 0

Stack Exit Co2 Method 3A CO2 3 120 0

Wednesday, February 23, 2011 Page 2 of 8
Utility Boiler MACT ICR Testing Unit 2 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 compoundsw will be determined by US EPA Method 320: Formaldehyde, CO, Methane, Moisture. 

Described in protocol.

Wednesday, February 23, 2011 Page 3 of 8
Utility Boiler MACT ICR Testing Unit 2 Limestone Generating Station

6/30/2010

Sampling / Stack Data Results Summary

Location Stack Exit - Method 25A

Average

Run Number 1 2 3

Test Date 4/22/2010 4/22/2010 4/22/2010

Run Start Time 9:00:00 AM 11:55:00 

AM

2:45:00 PM

Run Finish Time 11:15:00 AM 2:10:00 PM 5:00:00 PM

Carbon Dioxide, % 14.67 14.45 14.91 14.677

Oxygen, % 4.98 5.05 5.02 5.017

Dry Volumetric Flow Rate, dry scfm 1962000 1947000 1950000 1,953,000.00

0

F-Factor, dscfm/MMBtu @ %O2 10052 9787 9990 9,943.000

Moisture, % 19.02 19.12 19.26 19.133

Fuel Type Override Override Override

Fw 11730 11484 11648 11,620.667

Fc 1910 0 1910 1,273.333

Wednesday, February 23, 2011 Page 4 of 8
Utility Boiler MACT ICR Testing Unit 2 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 0.00E+00 0.000

ppm 0.00E+00 0.000

ppm@7%O2 0.00E+00 0.000

Wednesday, February 23, 2011 Page 5 of 8
Utility Boiler MACT ICR Testing Unit 2 Limestone Generating Station

6/30/2010

Process Run Data

APCD Run Data

Run Name Value UOM Comments

Target

Value

1 Bituminous Coal Burned 592.21 TPH 590

2 Bituminous Coal Burned 592.6 TPH 590

3 Bituminous Coal Burned 585.38 TPH 590

1 Average Heat Input 8735 mmBtu?hr 8600

2 Average Heat Input 8705 mmBtu?hr 8600

3 Average Heat Input 8666 mmBtu?hr 8600

1 Steam Output 6117 1000 lb steam/hr 6100

2 Steam Output 6110 1000 lb steam/hr 6100

3 Steam Output 6081 1000 lb steam/hr 6100

1 Flue gas flow rate 2E+06 dscfm 2E+06

2 Flue gas flow rate 2E+06 dscfm 2E+06

3 Flue gas flow rate 2E+06 dscfm 2E+06

1 Unit Net Electric Generation 1956 MWh 1950

2 Unit Net Electric Generation 1947 MWh 1950

3 Unit Net Electric Generation 1939 MWh 1950

1 Flue Gas Oxygen Content 4.98 % 5

2 Flue Gas Oxygen Content 5.05 % 5

3 Flue Gas Oxygen Content 5.02 % 5

1 Flue Gas Carbon Dioxide Content 14.67 % 14

2 Flue Gas Carbon Dioxide Content 14.45 % 14

3 Flue Gas Carbon Dioxide Content 14.91 % 14

1 Flue Gas Moisture Content 19.02 % 18

2 Flue Gas Moisture Content 19.12 % 18

3 Flue Gas Moisture Content 19.26 % 18

1 Flue gas Temperature 150 Deg F 160

2 Flue gas Temperature 152 Deg F 160

3 Flue gas Temperature 153 Deg F 160

1 Unit Gross Electrical Output 912 MW 900

2 Unit Gross Electrical Output 909 MW 900

3 Unit Gross Electrical Output 906 MW 900

Run Name Value UOM Comments

Target

Value

1 LOW NOX BURNERS 0 0

Wednesday, February 23, 2011 Page 6 of 8
Utility Boiler MACT ICR Testing Unit 2 Limestone Generating Station

6/30/2010

Process Lab Run Data

1 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 10405 Btu/lb

2 Fuel Higher Heating Value 10307 Btu/lb

3 Fuel Higher Heating Value 10752 Btu/lb

1 Fuel Moiture (Total) 29.98 %

2 Fuel Moiture (Total) 31.37 %

3 Fuel Moiture (Total) 31.17 %

1 Moisture as determined 13.18 %

2 Moisture as determined 13.62 %

3 Moisture as determined 13.81 %

1 Volatile Matter 41.55 %

2 Volatile Matter 42.58 %

3 Volatile Matter 43.68 %

1 Ash 17.8 %

2 Ash 14 %

3 Ash 13.23 %

1 Fixed Carbon 40.65 %

2 Fixed Carbon 43.42 %

3 Fixed Carbon 43.09 %

1 Carbon 62.79 %

2 Carbon 61.31 %

3 Carbon 64.3 %

1 Hydrogen 4.39 %

2 Hydrogen 4.09 %

3 Hydrogen 4.31 %

1 Nitrogen 1.15 %

2 Nitrogen 1.2 %

3 Nitrogen 1.22 %

1 Sulfur 0.86 %

2 Sulfur 1.08 %

3 Sulfur 0.68 %

1 Oxygen 13.01 %

2 Oxygen 18.32 %

3 Oxygen 16.26 %

Wednesday, February 23, 2011 Page 7 of 8
Utility Boiler MACT ICR Testing Unit 2 Limestone Generating Station

6/30/2010

Sampling / Stack Data Results Detail

Location Stack Exit - Method 25A

Average

Run Number 1 2 3

Test Date 4/22/2010 4/22/2010 4/22/2010

Run Start Time 9:00:00 AM 11:55:00 AM 2:45:00 PM

Run Finish Time 11:15:00 AM 2:10:00 PM 5:00:00 PM

Carbon Dioxide, % 14.67 14.45 14.91 14.677

Oxygen, % 4.98 5.05 5.02 5.017

Fuel Factor 1.09 1.1 1.07

Dry Volumetric Flow Rate, dry scfm 1962000 1947000 1950000 1,953,000.0

00

F-Factor, dscfm/MMBtu @ %O2 10052 9787 9990 9,943.000

Moisture, % 19.02 19.12 19.26 19.133

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

Calibration Pre Zero Cylinder Instrument Response 0.119 0.268 0.035 0.141

Calibration Pre Zero Cylinder Bias 0 0.18 -0.1 0.027

Calibration Pre Zero Cylinder Drift 0 0 0 0.000

Calibration Pre High Cylinder ID

Calibration Pre High Cylinder Instrument Response 25.427 25.251 25.731 25.470

Calibration Pre High Cylinder Bias 0 -0.21 0.37 0.053

Calibration Pre High Cylinder Drift 0 0 0 0.000

Calibration Post Zero Cylinder ID

Calibration Post Zero Cylinder Instrument Response 0.268 0.035 0.196 0.166

Calibration Post Zero Cylinder Bias 0.18 -0.1 0.09 0.057

Calibration Post Zero Cylinder Drift 0.18 0.28 0.19 0.217

Calibration Post High Cylinder ID

Calibration Post High Cylinder Instrument Response 25.251 25.731 25.775 25.586

Calibration Post High Cylinder Bias -0.21 0.37 0.42 0.193

Calibration Post High Cylinder Drift 0.21 0.58 0.05 0.280

Cavg -0.06 0.353 0.107 0.133

Cavg Units ppmvw ppmvw ppmvw

Cgas 0 0.000

Cgas Units ppmvd ppmvd ppmvd

Fuel Type Override Override Override

Fw 11730 11484 11648 11,620.667

Fc 1910 0 1910 1,273.333

Cgasw 0 0.000

Cgasw Units ppmvw ppmvw ppmvw

Wednesday, February 23, 2011 Page 8 of 8