### Name:

Title: Company: Sign Date: Name: Title: Company: Sign Date: Permitted Facility Representative / Date Testing Company Representative / Date 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.

Monday, February 07, 2011 Page 1 of 13

### Facility Information:

Plant Scherer Unit 4 10986 Highway 87

Juliette Ga 31046
Contact: Sarah Markham

Phone: 205-257-6780

Fax: 205-257-2988

Email: sasander@southernco.com Testing Company:

Weston Solutions 1625 Pumphrey Ave

Auburn Al 36832
Contact: Jon Howard

Phone: 334-466-5600

Fax: 334-466-5660

Email:

Air Permit Number: Permitted Source ID/Name:
Unit 4 4

Permitted Maximum Process Rate: Max. Normal Operation Process Rate: Target Process Test Rat

Description of the source (including control equipment). Please see the attachments for source or process flow diagram:
See attached Report Industry/SCC/NAIS

Sampling Location Information:

Test Parameter Information: AFS #: FRS #:

SCC / Description

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 324 8148 3852 4 0 12 0 0

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location
Flowrate Method 1 - 4 3 0 Stack % H2O Method 1 - 4 3 0 Stack Carbon Monoxide Method 10 3 0 Stack Formaldehyde Method 0011 3 0 Stack Total organic compounds

(TOC) as Propane Method 25A 3 0 Stack

O2 Method 3A O2 3 0 Stack Co2 Method 3A CO2 3 0 Stack



### Monday, February 07, 2011 Page 2 of 13

### 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.

-It is theorized that issues associated with the VOST analysis were due to high native source concentrations of Sulfur Dioxide (SO2). Specific issues are listed in the “General Comments” section of the Maxxam Analytics test report, Appendix D of the attached test report.

Maxxam Analytics comments: -The samples (VOST) exhibited extremely high levels of non-target compounds, mainly siloxanes, based on standards calibration criteria and response factors within the GC/MS, which caused the following to occur within the analytical sequence(s).

a)	The last internal standard (Bromofluorobenzene) failed for many of the samples b)	Following completion of an analytical run, we were unable to rid the system of these non-target analytes, thus inducing possible carryover into the subsequent analytical run(s). c)	We dismantled the desorber, rinsed, and baked it in a lab oven. Subsequent reinstallation of the hardware proved that residual amounts of the non-target analyte remained. d)	Repeated step c) again and finally were able to get to “clean” and ready. e)	Often difficult to meet the tuning criteria for the method and experienced huge losses of sensitivity on the system up to 2/3 of standard sensitivity. f)	Often could not get continuing calibrations to pass after running samples and it took hours of running calibrations to get the system to pass the continuing calibration criteria.

- Speciated VOST runs 1-3: levels of MeCl2 were found in the sample blank and the run to run data appears to be related to a level of contamination.

- Semi-VOST runs 1-3: Bis (2-ethylheyl) phthalate, this compound is commonly found in plastics, it is not a common combustion product but an artifact of sample recovery or lab handling.

- Method 10 (CO): Stratification test not <10% of mean. Historical test data indicates this sampling location is minimally stratified. The variation in CO concentration due to process effects would not allow a representative stratification test.

- Method 25A (THC): Due to the very low levels found in the source gas a response time study would not be representative as written in the methods.

- Method 25A The span gas values (low and mid) were not between method specified limits for percentage of achieved span concentration. Low span achieved 20%, method limits 25-35%. Mid span achieved 41%, method limits 45-55%.

- Method 18 (Methane): Due to low methane concentrations in the source sample, a bag stability study was performed in lieu of a recovery study. Subsequently, the data presented in the test report have not been corrected for the 70-130% spike recovery procedure.

-Method 18 - the instrument response for each injection was not within 5% of mean response for the instrument.

-Method 18 - A mid range calibration standard wasn't analyzed after all samples were run.

Monday, February 07, 2011 Page 3 of 13

### Sampling / Stack Data Results Summary

Location Stack - Method 0011 Average
Run Number 1 2 3

Test Date 1/6/2010 1/7/2010 1/7/2010

Run Start Time

Run Finish Time
Net Run Time, minutes 120 120 120 Dry Gas Meter Volume Sampled, dscf 82.301 81.262 79.398 80.987
Moisture Content of Stack Gas, % 11.70 12.05 11.74 11.830 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000
Carbon Dioxide, % 14.2 14.4 14.4 14.333 Oxygen, % 5.3 5.3 5.2 5.267 Average Stack Gas Temperature, °F 316.63 314.83 323.46 318.307 Dry Volumetric Flow Rate, dry scfm 2,003,050.9 1,969,173.2 1,928,338.6 1,966,854.23 3
Actual Wet Volumetric Flue Gas Flow Rate, acfm 3,460,407.9 3,407,503.8 3,362,157.5 3,410,023.06 7 Percent Isokinetic of Sampling Rate, % 100.6 101.1 100.8 100.833
F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000

Fw 10640 0 0 3,546.667

Fc 1800 0 0 600.000



### Location Stack - Method 10 Average
Run Number

Test Date

Run Start Time

Run Finish Time
Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm
F-Factor, dscfm/MMBtu @ %O2
Moisture, % Fuel Type

Fw

Fc



### Monday, February 07, 2011 Page 4 of 13

### Location Stack - Method 25A Average

Run Number

Test Date

Run Start Time

Run Finish Time
Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm
F-Factor, dscfm/MMBtu @ %O2
Moisture, % Fuel Type

Fw

Fc



### Location Stack - Method 3A CO2 Average
Run Number

Test Date

Run Start Time

Run Finish Time
Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm
F-Factor, dscfm/MMBtu @ %O2
Moisture, % Fuel Type

Fw

Fc



### Monday, February 07, 2011 Page 5 of 13

### Location Stack - Method 3A O2 Average

Run Number

Test Date

Run Start Time

Run Finish Time
Carbon Dioxide, % Oxygen, % Dry Volumetric Flow Rate, dry scfm
F-Factor, dscfm/MMBtu @ %O2
Moisture, % Fuel Type

Fw

Fc



### Monday, February 07, 2011 Page 6 of 13

### Emissions Summary

Process Run Data Location: Stack - Method 0011 Compound: Formaldehyde Average RunNumber 1 2 3 Mass_mg 0.006 0.008 0.007 0.007 lb/mmBtuO2 2.11E-06 2.84E-06 2.53E-06 0.000
ppm 2.06E-03 2.78E-03 2.49E-03 0.002 ppm@7%O2 1.84E-03 2.48E-03 2.20E-03 0.002



### Location: Stack - Method 10 

### Compound: Carbon Monoxide Average
Run 1 2 3 lb/mmBtuO2 4.31E-02 9.25E-02 7.31E-02 0.070
ppm 4.52E+01 9.71E+01 7.73E+01 73.200 ppm@7%O2 4.03E+01 8.65E+01 6.84E+01 65.067



### Location: Stack - Method 25A Compound: Total organic compounds (TOC) as Average
Run 1 2 3 lb/mmBtuO2 3.40E-04 8.64E-05 0.00E+00 0.000
ppm 2.26E-01 5.76E-02 0.00E+00 0.095 ppm@7%O2 2.01E-01 5.13E-02 0.00E+00 0.084



### Monday, February 07, 2011 Page 7 of 13

### Process Run Data

APCD Run Data

Process Lab Run Data Run Name Value UOM Comments Target Value
1 Gross Electric Output 8526 MW 0

2 Gross Electric Output 8331 MW 0

3 Gross Electric Output 8683 MW 0



### Run Name Value UOM Comments
1 Coal Fuel Analysis 8526 Btu/lb
2 Coal Fuel Analysis 8507 Btu/lb
3 Coal Fuel Analysis 8507 Btu/lb

Monday, February 07, 2011 Page 8 of 13

### Sampling / Stack Data Results Detail

Location Stack - Method 0011 Average Run Number 1 2 3
Test Date 1/6/2010 1/7/2010 1/7/2010 Run Start Time Run Finish Time Net Traversing Points 25 25 25 Net Run Time, minutes 120 120 120 Nozzle Diameter, inches 0.189 0.189 0.189 0.189 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.972 0.972 0.972 0.972 Barometric Pressure, inches of Mercury 29.15 29.15 29.15 29.150 Average Orifice Meter Differential, inches H2O 1.63 1.57 1.51 1.570 Dry Gas Meter Volume Sampled, cubic feet 86.061 84.349 83.944 84.785 Average Dry Gas Meter Temperature, °F 65.00 61.06 70.65 65.570 Dry Gas Meter Volume Sampled, dscf 82.301 81.262 79.398 80.987 Total Moisture Liquid collected, g 231.70000000 0001 236.5000000

00001 224.3 230.833

Volume of Water Vapor, standard cubic feet 10.91 11.13 10.56 10.867 Moisture Content of Stack Gas, % 11.70 12.05 11.74 11.830 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.883 0.8795 0.8826 0.882 Carbon Dioxide, % 14.2 14.4 14.4 14.333 Oxygen, % 5.3 5.3 5.2 5.267 Carbon Monoxide & Nitrogen, % 80.5 80.3 80.4 80.400 Fuel Factor 1.10 1.08 1.09 Dry Molecular Weight, lb/lb-Mole 30.48 30.52 30.51 30.503 Wet Molecular weight, lb/lb-Mole 29.02 29.01 29.04 29.023 Flue Gas Static Pressure, inches of H2O -4.1 -4.1 -4.1 -4.100 Absolute Flue Gas Pressure, inches of Mercury 28.85 28.85 28.85 28.850 Average Stack Gas Temperature, °F 316.63 314.83 323.46 318.307 Average Velocity Head, inches of H2O 2.1211528365 0888 2.060977258

78006 1.986349943

39521 2.056

Average Stack Gas Velocity, feet/second 100.73 99.19 97.87 99.263 Stack Cross-Sectional Area, square feet 572.555 572.555 572.555 572.555 Dry Volumetric Flow Rate, dry scfm 2,003,050.9 1,969,173.2 1,928,338.6 1,966,854.2 33 Actual Wet Volumetric Flue Gas Flow Rate, acfm 3,460,407.9 3,407,503.8 3,362,157.5 3,410,023.0 67 Percent Isokinetic of Sampling Rate, % 100.6 101.1 100.8 100.833 Percent Excess Air, % 33.2 33.3 32.4 32.967 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Round Duct Diameter, inches 324 324 324 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0
Fw 10640 0 0 3,546.667
Fc 1800 0 0 600.000



### Monday, February 07, 2011 Page 9 of 13

### Location Stack - Method 10 Average

Run Number
Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type
Fw
Fc Cgasw Cgasw Units



### Monday, February 07, 2011 Page 10 of 13

### Location Stack - Method 25A Average

Run Number
Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type
Fw
Fc Cgasw Cgasw Units



### Monday, February 07, 2011 Page 11 of 13

### Location Stack - Method 3A CO2 Average

Run Number
Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type
Fw
Fc Cgasw Cgasw Units



### Monday, February 07, 2011 Page 12 of 13

### Location Stack - Method 3A O2 Average

Run Number
Test Date Run Start Time Run Finish Time Carbon Dioxide, % Oxygen, % Fuel Factor Dry Volumetric Flow Rate, dry scfm F-Factor, dscfm/MMBtu @ %O2 Moisture, % Analyzer Make Analyzer Model Analyzer Serial Number Operating Range Operating Units No. Readings/Avg. Calibration Set Calibration Pre Zero Cylinder ID Calibration Pre Zero Cylinder Instrument Response Calibration Pre Zero Cylinder Bias Calibration Pre Zero Cylinder Drift Calibration Pre High Cylinder ID Calibration Pre High Cylinder Instrument Response Calibration Pre High Cylinder Bias Calibration Pre High Cylinder Drift Calibration Post Zero Cylinder ID Calibration Post Zero Cylinder Instrument Response Calibration Post Zero Cylinder Bias Calibration Post Zero Cylinder Drift Calibration Post High Cylinder ID Calibration Post High Cylinder Instrument Response Calibration Post High Cylinder Bias Calibration Post High Cylinder Drift Cavg Cavg Units Cgas Cgas Units Fuel Type
Fw
Fc Cgasw Cgasw Units



### Monday, February 07, 2011 Page 13 of 13