### Name: John M. McManus

Title: Vice-President, Environmental Service Company: American Electric Power Sign Date: 7/29/2010 Name: Scott W. Banach Title: Director, Project Engineering Company: Platt Environmental Services, Inc. Sign Date: 7/28/2010 Permitted Facility Representative / Date Testing Company Representative / Date 

## Welsh Unit 1 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, January 19, 2011 Page 1 of 18

### Welsh Unit 1
7/29/2010 Facility Information:
Welsh Unit 1 1187 County Road 4865

Pittsburg TX75686 Contact:Paul Jackson Phone: 614-716-3278 Fax: 614-716-1252 Email: pmjackson@aep.com Testing Company: Platt Environmental Services, Inc. 1520 Kensington Road
Suite 204
Oak Brook IL 60523 Contact:Scott Banach Phone:630-521-9400 Fax: 630-521-9494 Email: sbanach@plattenv.com

Air Permit Number: O-00026 Permitted Source ID/Name: Boiler 1 Unit 1 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: Electric generating dry bottom wall fired boiler utilizing subbituminous coal as the primary fuel. Industry/SCC/NAIS221112

Sampling Location Information:

Test Parameter Information: AFS #: FRS #:

SCC / Description10100222 External Combustion Boilers - Electric Generation - Bituminous/Subbituminous Coal - Pulverized Coal: Dry Bottom (Subbituminous 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 0 66 157.2 6 0 24 144 222

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location Carbon Monoxide Method 10 3 0 Stack Total organic compounds

(TOC) Method 25A 3 0 Stack
Hydrogen Fluoride Method 26A 3 0 Stack Hydrogen Chloride Method 26A 3 0 Stack Total PM2.5 OTM - 27/28 3 0 Stack Filterable PM2.5 OTM - 27/28 3 0 Stack Filterable Particulate OTM - 27/28 3 0 Stack


### Wednesday, January 19, 2011 Page 2 of 18

### Welsh Unit 1
7/29/2010

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.

Total Particulate OTM - 27/28 3 0 Stack Selenium Method 29 3 0 Stack Antimony Method 29 3 0 Stack Arsenic Method 29 3 0 Stack Beryllium Method 29 3 0 Stack Cadmium Method 29 3 0 Stack Chromium Method 29 3 0 Stack Cobalt Method 29 3 0 Stack Lead Method 29 3 0 Stack Nickel Method 29 3 0 Stack Filterable Particulate Method 29 3 0 Stack Manganese Method 29 3 0 Stack Co2 Method 3A CO2 3 60 0 Stack O2 Method 3A O2 3 60 0 Stack



### Wednesday, January 19, 2011 Page 3 of 18

### Welsh Unit 1
7/29/2010 Sampling / Stack Data Results Summary


### Location Stack - Method 10 Average Run Number 1 2 3
Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM 10:55:00 AM 1:30:00 PM

Run Finish Time 10:14:00 AM 12:54:00 PM 3:29:00 PM

Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 1370358 1,367,058.00 0 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Location Stack - Method 25A Average Run Number 1 2 3
Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM 10:55:00 AM 1:30:00 PM

Run Finish Time 10:14:00 AM 12:54:00 PM 3:29:00 PM

Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 1370358 1,367,058.00 0 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Wednesday, January 19, 2011 Page 4 of 18

### Welsh Unit 1
7/29/2010
Location Stack - Method 26A Average Run Number M26A-1 M26A-2 M26A-3
Test Date 4/13/2010 4/14/2010 4/15/2010 Run Start Time 2:00:00 PM 12:30:00 PM 12:30:00 PM

Run Finish Time 5:32:00 PM4:02:00 PM 4:02:00 PM Net Run Time, minutes 192 192 192 Dry Gas Meter Volume Sampled, dscf 99.228 98.400 98.599 98.742 Moisture Content of Stack Gas, % 10.66 9.53 9.41 9.867 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 12.7 12.25 12.85 12.600 Oxygen, % 6.7 7.2 6.75 6.883 Average Stack Gas Temperature, °F 294.79 290.31 291.31 292.137 Dry Volumetric Flow Rate, dry scfm 1,332,177.81,366,968.6 1,363,354.3 1,354,166.90 0 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,157,573.62,173,291.2 2,163,168.0 2,164,677.60 0 Percent Isokinetic of Sampling Rate, % 101.1 97.7 98.1 98.967 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Wednesday, January 19, 2011 Page 5 of 18

### Welsh Unit 1
7/29/2010
Location Stack - Method 29 Average Run Number M29-1 M29-2 M29-3
Test Date 4/13/2010 4/14/2010 4/15/2010 Run Start Time 8:20:00 AM 7:50:00 AM 7:45:00 AM

Run Finish Time 1:10:00 PM 12:02:00 PM 12:02:00 PM

Net Run Time, minutes 160 160 160 Dry Gas Meter Volume Sampled, dscf 123.393 127.101 129.225 126.573 Moisture Content of Stack Gas, % 10.16 10.94 10.73 10.610 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 12.65 12.35 12.75 12.583 Oxygen, % 6.8 7.25 6.8 6.950 Average Stack Gas Temperature, °F 297.44 282.50 283.69 287.877 Dry Volumetric Flow Rate, dry scfm 1,287,413.41,338,298.2 1,345,150.0 1,323,620.53 3 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,049,548.42,106,824.4 2,116,015.2 2,090,796.00 0 Percent Isokinetic of Sampling Rate, % 156.0 154.6 156.4 155.667 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Location Stack - Method 3A CO2 Average Run Number 1 2 3
Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM 10:55:00 AM 1:30:00 PM

Run Finish Time 10:14:00 AM 12:54:00 PM 3:29:00 PM

Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 1370358 1,367,058.00 0 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Wednesday, January 19, 2011 Page 6 of 18

### Welsh Unit 1
7/29/2010
Location Stack - Method 3A O2 Average Run Number 1 2 3
Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM 10:55:00 AM 1:30:00 PM

Run Finish Time 10:14:00 AM 12:54:00 PM 3:29:00 PM

Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 1370358 1,367,058.00 0 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Location Stack - OTM - 27/28 Average Run Number MOTM27/O TM28-1 MOTM27/

OTM28-2 MOTM27/O

TM28-3
Test Date 4/13/2010 4/14/2010 4/15/2010 Run Start Time 8:20:00 AM 7:50:00 AM 7:45:00 AM

Run Finish Time 3:01:00 PM2:01:45 PM 1:50:45 PM Net Run Time, minutes 360 360.5 356 Dry Gas Meter Volume Sampled, dscf 125.739 122.613 127.647 125.333 Moisture Content of Stack Gas, % 8.22 10.31 10.73 9.753 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 12.7 12.4 12.8 12.633 Oxygen, % 6.78 7.3 6.8 6.960 Average Stack Gas Temperature, °F 300.01 290.33 291.71 294.017 Dry Volumetric Flow Rate, dry scfm 1,300,032.71,382,185.1 1,382,402.0 1,354,873.26 7 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,032,765.22,183,414.4 2,198,066.4 2,138,082.00 0 Percent Isokinetic of Sampling Rate, % 109.4 100.2 105.6 105.067 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000
Fw 10640 10640 10640 10,640.000
Fc 1800 1800 1800 1,800.000



### Wednesday, January 19, 2011 Page 7 of 18

### Welsh Unit 1
7/29/2010 Emissions Summary


### Location: Stack - Method 10 Compound: Carbon Monoxide Average Run 1 2 3 lb/mmBtuO2 1.39E-01 1.75E-01 1.70E-01 0.161 ppm 1.34E+02 1.63E+02 1.58E+02 151.667 ppm@7%O2 1.30E+02 1.64E+02 1.59E+02 151.000



### Location: Stack - Method 25A Compound: Total organic compounds (TOC) Average Run 1 2 3 lb/mmBtuO2 2.00E-05 8.72E-05 8.52E-05 0.000 ppm 4.50E-02 1.89E-01 1.84E-01 0.139 ppm@7%O2 4.37E-02 1.90E-01 1.85E-01 0.140



### Location: Stack - Method 26A Compound: Hydrogen Chloride Average RunNumber M26A-1 M26A-2 M26A-3 Mass_mg 0.53384 0.64601 0.60889 0.596 lb/mmBtuO2 1.71E-04 2.16E-04 1.97E-04 0.000 

### Compound: Hydrogen Fluoride Average RunNumber M26A-1 M26A-2 M26A-3 Mass_mg 0.28471 0.53834 0.4298 0.418 lb/mmBtuO2 9.11E-05 1.80E-04 1.39E-04 0.000



### Location: Stack - Method 29 Compound: Antimony Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.000519 0.000501 0.000493 0.001 lb/mmBtuO2 1.34E-07 1.30E-07 1.22E-07 0.000 

### Compound: Arsenic Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.000804 0.000643 0.000578 0.001 lb/mmBtuO2 2.08E-07 1.67E-07 1.43E-07 0.000 

### Compound: Beryllium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.00013 0.00012 0.000123 0.000 lb/mmBtuO2 3.37E-08 3.12E-08 3.04E-08 0.000



### Wednesday, January 19, 2011 Page 8 of 18

### Welsh Unit 1
7/29/2010 Compound: Cadmium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.000305 0.000245 0.000375 0.000 lb/mmBtuO2 7.90E-08 6.36E-08 9.27E-08 0.000 

### Compound: Chromium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.008412 0.004462 0.012851 0.009 lb/mmBtuO2 2.18E-06 1.16E-06 3.18E-06 0.000 

### Compound: Cobalt Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.000582 0.000387 0.000534 0.001 lb/mmBtuO2 1.51E-07 1.01E-07 1.32E-07 0.000 

### Compound: Filterable Particulate Average RunNumber M29-1 M29-2 M29-3 Mass_mg 45.9 62.4 50.2 52.833 lb/mmBtuO2 1.19E-02 1.62E-02 1.24E-02 0.014 

### Compound: Lead Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.001545 0.001044 0.001069 0.001 lb/mmBtuO2 4.00E-07 2.71E-07 2.64E-07 0.000 

### Compound: Manganese Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.016829 0.006517 0.004275 0.009 lb/mmBtuO2 4.36E-06 1.69E-06 1.06E-06 0.000 

### Compound: Nickel Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.011988 0.004596 0.010524 0.009 lb/mmBtuO2 3.10E-06 1.19E-06 2.60E-06 0.000 

### Compound: Selenium Average RunNumber M29-1 M29-2 M29-3 Mass_mg 0.008501 0.011029 0.011429 0.010 lb/mmBtuO2 2.20E-06 2.86E-06 2.83E-06 0.000



### Location: Stack - OTM - 27/28 

### Compound: Filterable Particulate Average RunNumber MOTM27/OTM28-1 MOTM27/OTM28-2 MOTM27/OTM28-3 Mass_mg 12.6 28.7 18.4 19.900


### Wednesday, January 19, 2011 Page 9 of 18

### Welsh Unit 1
7/29/2010

Process Run Data Compound: Filterable PM2.5 Average RunNumber MOTM27/OTM28-1 MOTM27/OTM28-2 MOTM27/OTM28-3 Mass_mg 9 18 18 15.000 

### Compound: Total Particulate Average RunNumber MOTM27/OTM28-1 MOTM27/OTM28-2 MOTM27/OTM28-3 Mass_mg 63.4 50.5 56.7 56.867 

### Compound: Total PM2.5 Average RunNumber MOTM27/OTM28-1 MOTM27/OTM28-2 MOTM27/OTM28-3 Mass_mg 59.8 56.3 56.3 57.467



### Wednesday, January 19, 2011 Page 10 of 18

### Welsh Unit 1
7/29/2010 Process Run Data

APCD Run Data

Process Lab Run Data 

### Run Name Value UOM Comments Target Value 1 Steam Temperature 988 F 1000


### 1 Steam Pressure 2403 psig 2400
1 Gross Load 487.4 MW 500
1 Fuel Flow 572 Tons/hr 575


### 1 Opacity 4.4 % 20
2 Steam Temperature 988 F 1000
2 Steam Pressure 2403 psig 2400


### 2 Gross Load 489 MW 500
2 Fuel Flow 571 Tons/hr 575
2 Opacity 4.4 % 20


### 3 Steam Temperature 991 F 1000
3 Steam Pressure 2404 psig 2400
3 Gross Load 500 MW 500


### 3 Fuel Flow 582 Tons/hr 575
3 Opacity 4.68 % 20

Run Name Value UOM Comments Target Value 

### 1 ELECTROSTATIC PRECIPITATOR - HIGH EFFICIENCY 4.4 opacity % 20

2 ELECTROSTATIC PRECIPITATOR - HIGH EFFICIENCY 4.4 opacity % 20



### 3 ELECTROSTATIC PRECIPITATOR - HIGH EFFICIENCY 4.68 opacity % 20

Wednesday, January 19, 2011 Page 11 of 18

### Welsh Unit 1
7/29/2010 Sampling / Stack Data Results Detail


### Location Stack - Method 10 Average Run Number 1 2 3 Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM10:55:00 AM 1:30:00 PM Run Finish Time 10:14:00 AM12:54:00 PM 3:29:00 PM Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Fuel Factor 1.12 1.11 1.11 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 13703581,367,058.0 00 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Analyzer Make Analyzer Model Analyzer Serial Number 06104162970610416297 0610416297610,416,297 .000 Operating Range 1000 1000 1000 1,000.000 Operating Units ppm ppm ppm No. Readings/Avg. 119 119 119 119.000 Calibration Set 2 2 2 2.000 Calibration Pre Zero Cylinder ID CC205369-CO CC205369- CO CC205369-

CO Calibration Pre Zero Cylinder Instrument Response 2.2 0.8 1.1 1.367 Calibration Pre Zero Cylinder Bias 0.27 0.13 0.16 0.187 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID CC50124-CO CC50124- COCC50124-CO
Calibration Pre High Cylinder Instrument Response 305.1 305.6 304.4 305.033 Calibration Pre High Cylinder Bias 0.11 0.16 0.04 0.103 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID CC205369-CO CC205369- CO CC205369-

CO Calibration Post Zero Cylinder Instrument Response 0.8 1.1 0.6 0.833 Calibration Post Zero Cylinder Bias 0.13 0.16 0.11 0.133 Calibration Post Zero Cylinder Drift 0.14 0.03 0.05 0.073 Calibration Post High Cylinder ID CC50124-CO CC50124- COCC50124-CO
Calibration Post High Cylinder Instrument Response 305.6 304.4 303.6 304.533 Calibration Post High Cylinder Bias 0.16 0.04 -0.04 0.053 Calibration Post High Cylinder Drift 0.05 0.12 0.08 0.083 Cavg 134.7 163.3 158.3 152.100 Cavg Units ppmvd ppmvd ppmvd Cgas 133.5726 162.6971 158.255 151.508 Cgas Units ppmvd ppmvd ppmvd Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000 Cgasw 0 0 0 0.000 Cgasw Units


### Wednesday, January 19, 2011 Page 12 of 18

### Welsh Unit 1
7/29/2010

Location Stack - Method 25A Average Run Number 1 2 3 Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM10:55:00 AM 1:30:00 PM Run Finish Time 10:14:00 AM12:54:00 PM 3:29:00 PM Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Fuel Factor 1.12 1.11 1.11 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 13703581,367,058.0 00 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Analyzer Make Analyzer Model Analyzer Serial Number 200305 200305 200305200,305.000 Operating Range 10 10 10 10.000 Operating Units ppm ppm PPM No. Readings/Avg. 120 119 119 119.333 Calibration Set 3 3 3 3.000 Calibration Pre Zero Cylinder ID ZERO-AIRTHCZERO-AIRTHC ZERO-AIRTHC Calibration Pre Zero Cylinder Instrument Response 0.11 0 0.02 0.043 Calibration Pre Zero Cylinder Bias 0 -1.1 -0.9 -0.667 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID CC175572- THC CC175572-

THC CC175572-

THC Calibration Pre High Cylinder Instrument Response 6.03 6.03 6.02 6.027 Calibration Pre High Cylinder Bias 0 0 -0.1 -0.033 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID ZERO-AIRTHCZERO-AIRTHC ZERO-AIRTHC Calibration Post Zero Cylinder Instrument Response 0 0.02 0.01 0.010 Calibration Post Zero Cylinder Bias -1.1 -0.9 -1 -1.000 Calibration Post Zero Cylinder Drift 1.1 0.2 0.1 0.467 Calibration Post High Cylinder ID CC175572- THC CC175572-

THC CC175572-

THC Calibration Post High Cylinder Instrument Response 6.03 6.02 6 6.017 Calibration Post High Cylinder Bias 0 -0.1 -0.3 -0.133 Calibration Post High Cylinder Drift 0 0.1 0.2 0.100 Cavg 0.1 0.2 0.2 0.167 Cavg Units ppmvd ppmvd ppmvd Cgas 0.045 0.1889 0.1845 0.139 Cgas Units ppmvd ppmvd ppmvd Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000 Cgasw 0 0 0 0.000 Cgasw Units



### Wednesday, January 19, 2011 Page 13 of 18

### Welsh Unit 1
7/29/2010
Location Stack - Method 26A Average Run Number M26A-1 M26A-2 M26A-3 Test Date 4/13/2010 4/14/2010 4/15/2010 Run Start Time 2:00:00 PM12:30:00 PM 12:30:00 PM Run Finish Time 5:32:00 PM 4:02:00 PM 4:02:00 PM Net Traversing Points 54 54 54 Net Run Time, minutes 192 192 192 Nozzle Diameter, inches 0.125 0.125 0.125 0.125 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1 1 1 1.000 Barometric Pressure, inches of Mercury 29.49 29.49 29.55 29.510 Average Orifice Meter Differential, inches H2O 0.81 0.81 0.80 0.807 Dry Gas Meter Volume Sampled, cubic feet 104.272 103.649 103.279 103.733 Average Dry Gas Meter Temperature, °F 87.97 89.28 87.31 88.187 Dry Gas Meter Volume Sampled, dscf 99.228 98.400 98.599 98.742 Total Moisture Liquid collected, g 251.6 220.3 217.6 229.833 Volume of Water Vapor, standard cubic feet 11.84 10.37 10.24 10.817 Moisture Content of Stack Gas, % 10.66 9.53 9.41 9.867 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.8934 0.9047 0.9059 0.901 Carbon Dioxide, % 12.7 12.25 12.85 12.600 Oxygen, % 6.7 7.2 6.75 6.883 Carbon Monoxide & Nitrogen, % 80.6 80.55 80.4 80.517 Fuel Factor 1.12 1.12 1.10 Dry Molecular Weight, lb/lb-Mole 30.30 30.25 30.33 30.293 Wet Molecular weight, lb/lb-Mole 28.99 29.08 29.17 29.080 Flue Gas Static Pressure, inches of H2O 1 1 1 1.000 Absolute Flue Gas Pressure, inches of Mercury 29.56 29.56 29.62 29.580 Average Stack Gas Temperature, °F 294.79 290.31 291.31 292.137 Average Velocity Head, inches of H2O 5.7765872237 37615.914148822

7949 5.881642007

02582 5.857
Average Stack Gas Velocity, feet/second 161.98 163.16 162.40 162.513 Stack Cross-Sectional Area, square feet 222.000 222.000 222.000 222.000 Dry Volumetric Flow Rate, dry scfm 1,332,177.8 1,366,968.6 1,363,354.31,354,166.9 00 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,157,573.6 2,173,291.2 2,163,168.02,164,677.6 00 Percent Isokinetic of Sampling Rate, % 101.1 97.7 98.1 98.967 Percent Excess Air, % 46.0 51.2 46.6 47.933 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Round Duct Diameter, inches 0 0 0 Rectangular Duct Width, inches 144 144 144 Rectangular Duct Length, inches 222 222 222 Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000



### Wednesday, January 19, 2011 Page 14 of 18

### Welsh Unit 1
7/29/2010
Location Stack - Method 29 Average Run Number M29-1 M29-2 M29-3 Test Date 4/13/2010 4/14/2010 4/15/2010 Run Start Time 8:20:00 AM 7:50:00 AM 7:45:00 AM Run Finish Time 1:10:00 PM12:02:00 PM 12:02:00 PM Net Traversing Points 74 72 72 Net Run Time, minutes 160 160 160 Nozzle Diameter, inches 0.125 0.125 0.125 0.125 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1 1 1 1.000 Barometric Pressure, inches of Mercury 29.94 29.94 29.94 29.940 Average Orifice Meter Differential, inches H2O 0.74 0.82 0.83 0.797 Dry Gas Meter Volume Sampled, cubic feet 124.933 130.009 131.302 128.748 Average Dry Gas Meter Temperature, °F 75.92 81.53 77.94 78.463 Dry Gas Meter Volume Sampled, dscf 123.393 127.101 129.225 126.573 Total Moisture Liquid collected, g 296.6 331.7 330.1 319.467 Volume of Water Vapor, standard cubic feet 13.96 15.61 15.54 15.037 Moisture Content of Stack Gas, % 10.16 10.94 10.73 10.610 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.8984 0.8906 0.8927 0.894 Carbon Dioxide, % 12.65 12.35 12.75 12.583 Oxygen, % 6.8 7.25 6.8 6.950 Carbon Monoxide & Nitrogen, % 80.55 80.4 80.45 80.467 Fuel Factor 1.11 1.11 1.11 Dry Molecular Weight, lb/lb-Mole 30.30 30.27 30.31 30.293 Wet Molecular weight, lb/lb-Mole 29.05 28.93 28.99 28.990 Flue Gas Static Pressure, inches of H2O 1 1 1 1.000 Absolute Flue Gas Pressure, inches of Mercury 30.01 30.01 30.01 30.010 Average Stack Gas Temperature, °F 297.44 282.50 283.69 287.877 Average Velocity Head, inches of H2O 5.2843417999 67075.672552464

67262 5.724968285

12028 5.561
Average Stack Gas Velocity, feet/second 153.87 158.17 158.86 156.967 Stack Cross-Sectional Area, square feet 222.000 222.000 222.000 222.000 Dry Volumetric Flow Rate, dry scfm 1,287,413.4 1,338,298.2 1,345,150.01,323,620.5 33 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,049,548.4 2,106,824.4 2,116,015.22,090,796.0 00 Percent Isokinetic of Sampling Rate, % 156.0 154.6 156.4 155.667 Percent Excess Air, % 47.0 51.9 47.1 48.667 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Round Duct Diameter, inches 0 0 0 Rectangular Duct Width, inches 144 144 144 Rectangular Duct Length, inches 222 222 222 Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000



### Wednesday, January 19, 2011 Page 15 of 18

### Welsh Unit 1
7/29/2010
Location Stack - Method 3A CO2 Average Run Number 1 2 3 Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM10:55:00 AM 1:30:00 PM Run Finish Time 10:14:00 AM12:54:00 PM 3:29:00 PM Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Fuel Factor 1.12 1.11 1.11 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 13703581,367,058.0 00 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Analyzer Make ServoMex ServoMex ServoMex Analyzer Model 01440D1 01440D1 01440D114,400.000 Analyzer Serial Number 3791 3791 3791 3,791.000 Operating Range 20 20 20 20.000 Operating Units % % % No. Readings/Avg. 119 119 119 119.000 Calibration Set 0 0 0 0.000 Calibration Pre Zero Cylinder ID CC34785-CO2 CC34785- CO2 CC34785-

CO2 Calibration Pre Zero Cylinder Instrument Response 0.01 0.06 0.05 0.040 Calibration Pre Zero Cylinder Bias -0.15 0.1 0.05 0.000 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID CC205369- CO2 CC205369-

CO2 CC205369-

CO2 Calibration Pre High Cylinder Instrument Response 9.79 9.76 9.77 9.773 Calibration Pre High Cylinder Bias -0.5 -0.65 -0.6 -0.583 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID CC34785-CO2 CC34785- CO2 CC34785-

CO2 Calibration Post Zero Cylinder Instrument Response 0.06 0.05 0.05 0.053 Calibration Post Zero Cylinder Bias 0.1 0.05 0.05 0.067 Calibration Post Zero Cylinder Drift 0.25 0.05 0 0.100 Calibration Post High Cylinder ID CC205369- CO2 CC205369-

CO2 CC205369-

CO2 Calibration Post High Cylinder Instrument Response 9.76 9.77 9.76 9.763 Calibration Post High Cylinder Bias -0.65 -0.6 -0.65 -0.633 Calibration Post High Cylinder Drift 0.15 0.05 0.05 0.083 Cavg 12.8 12.4 12.4 12.533 Cavg Units %vd %vd %vd Cgas 12.8436 12.4594 12.4581 12.587 Cgas Units %vd %vd %vd Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000 Cgasw 0 0 0 0.000 Cgasw Units



### Wednesday, January 19, 2011 Page 16 of 18

### Welsh Unit 1
7/29/2010
Location Stack - Method 3A O2 Average Run Number 1 2 3 Test Date 4/16/2010 4/16/2010 4/16/2010 Run Start Time 8:15:00 AM10:55:00 AM 1:30:00 PM Run Finish Time 10:14:00 AM12:54:00 PM 3:29:00 PM Carbon Dioxide, % 12.8 12.4 12.4 12.533 Oxygen, % 6.6 7.1 7.1 6.933 Fuel Factor 1.12 1.11 1.11 Dry Volumetric Flow Rate, dry scfm 1342123 1388693 13703581,367,058.0 00 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Moisture, % 11.1 9.5 11.2 10.600 Analyzer Make ServoMex ServoMex ServoMex Analyzer Model 01440D1 01440D1 01440D114,400.000 Analyzer Serial Number 3791 3791 3791 3,791.000 Operating Range 25 25 25 25.000 Operating Units % % % No. Readings/Avg. 119 119 119 119.000 Calibration Set 1 1 1 1.000 Calibration Pre Zero Cylinder ID CC34785-O2CC34785-O2CC34785-O2 Calibration Pre Zero Cylinder Instrument Response 0.05 0.02 0.02 0.030 Calibration Pre Zero Cylinder Bias 0.12 0 0 0.040 Calibration Pre Zero Cylinder Drift 0 0 0 0.000 Calibration Pre High Cylinder ID CC205369-O2 CC205369- O2 CC205369-

O2 Calibration Pre High Cylinder Instrument Response 11.96 11.93 11.89 11.927 Calibration Pre High Cylinder Bias -0.12 -0.24 -0.4 -0.253 Calibration Pre High Cylinder Drift 0 0 0 0.000 Calibration Post Zero Cylinder ID CC34785-O2CC34785-O2CC34785-O2 Calibration Post Zero Cylinder Instrument Response 0.02 0.02 0.02 0.020 Calibration Post Zero Cylinder Bias 0 0 0 0.000 Calibration Post Zero Cylinder Drift 0.12 0 0 0.040 Calibration Post High Cylinder ID CC205369-O2 CC205369- O2 CC205369-

O2 Calibration Post High Cylinder Instrument Response 11.93 11.89 11.85 11.890 Calibration Post High Cylinder Bias -0.24 -0.4 -0.56 -0.400 Calibration Post High Cylinder Drift 0.12 0.16 0.16 0.147 Cavg 6.6 7.1 7.1 6.933 Cavg Units %vd %vd %vd Cgas 6.576 7.1038 7.1278 6.936 Cgas Units %vd %vd %vd Fuel Type Coal - Bituminous Coal -

Bituminous Coal -

Bituminous Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000 Cgasw 0 0 0 0.000 Cgasw Units



### Wednesday, January 19, 2011 Page 17 of 18

### Welsh Unit 1
7/29/2010
Location Stack - OTM - 27/28 Average Run Number MOTM27/OT M28-1MOTM27/O

TM28-2MOTM27/OT

M28-3 Test Date 4/13/2010 4/14/2010 4/15/2010 Run Start Time 8:20:00 AM 7:50:00 AM 7:45:00 AM Run Finish Time 3:01:00 PM 2:01:45 PM 1:50:45 PM Net Traversing Points 79 78 78 Net Run Time, minutes 360 360.5 356 Nozzle Diameter, inches 0.1 0.1 0.1 0.100 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 1.008 1.008 1.008 1.008 Barometric Pressure, inches of Mercury 29.94 29.94 29.94 29.940 Average Orifice Meter Differential, inches H2O 0.41 0.41 0.41 0.410 Dry Gas Meter Volume Sampled, cubic feet 126.915 124.452 128.941 126.769 Average Dry Gas Meter Temperature, °F 78.10 81.11 78.52 79.243 Dry Gas Meter Volume Sampled, dscf 125.739 122.613 127.647 125.333 Total Moisture Liquid collected, g 239.2 299.3 326.1 288.200 Volume of Water Vapor, standard cubic feet 11.26 14.09 15.35 13.567 Moisture Content of Stack Gas, % 8.22 10.31 10.73 9.753 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9178 0.8969 0.8927 0.902 Carbon Dioxide, % 12.7 12.4 12.8 12.633 Oxygen, % 6.78 7.3 6.8 6.960 Carbon Monoxide & Nitrogen, % 80.52 80.3 80.4 80.407 Fuel Factor 1.11 1.10 1.10 Dry Molecular Weight, lb/lb-Mole 30.30 30.28 30.32 30.300 Wet Molecular weight, lb/lb-Mole 29.29 29.01 29.00 29.100 Flue Gas Static Pressure, inches of H2O 1 1 1 1.000 Absolute Flue Gas Pressure, inches of Mercury 30.01 30.01 30.01 30.010 Average Stack Gas Temperature, °F 300.01 290.33 291.71 294.017 Average Velocity Head, inches of H2O 5.2233586495 52686.045526364

18172 6.113780710

71408 5.794
Average Stack Gas Velocity, feet/second 152.61 163.92 165.02 160.517 Stack Cross-Sectional Area, square feet 222.000 222.000 222.000 222.000 Dry Volumetric Flow Rate, dry scfm 1,300,032.7 1,382,185.1 1,382,402.01,354,873.2 67 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,032,765.2 2,183,414.4 2,198,066.42,138,082.0 00 Percent Isokinetic of Sampling Rate, % 109.4 100.2 105.6 105.067 Percent Excess Air, % 46.8 52.5 47.1 48.800 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Round Duct Diameter, inches 0 0 0 Rectangular Duct Width, inches 144 144 144 Rectangular Duct Length, inches 222 222 222 Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000



### Wednesday, January 19, 2011 Page 18 of 18