### 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.

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### Facility Information:

Plant Bowen 317 Covered Bridge Rd. SW

Cartersville Ga30120 Contact:Sarah Markham Phone: 205-257-6780 Fax: Email: sasander@southernco.com Testing Company: Weston Solutions 1625 Pumphrey

Auburn AL36832 Contact:Jon Howard Phone:334-466-5600 Fax: 334-466-5660 Email: jon.howard@westonsolutions.com

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

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

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 408 8148 3852 4 0 12 0 0

Target Parameter Test Method Number of

Test Runs Test Run

Duration Sample

Points Comments Location Hydrogen Fluoride Method 26A 3 0 Stack Hydrogen Chloride Method 26A 3 0 Stack



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### -Method 26A - The laboratory analysis for HCl and HF was completed in accordance with Method 26A

procedures and no analytical issues were encountered. During the time of sampling the normality of the NaOH impingers for HCN adsorption was not adjusted to maintain a pH above 12 through each test run. Although the test runs were conducted within method guidelines EPA issued guidance suggesting these modifications be made to maintain desired pH levels above 12. Furthermore, near the time of this test event or shortly after EPA posted to the ICR FAQS page that HCl/HF/HCN test runs using Method 26A procedures should be reduced to one hour from the three-hour specification published in the original 114 letters. These tests were performed for three hours using the initial specifications. -The CO2 gases near 13% within each source gas stream exhaust the adsorption potential of the NaOH solution and therefore some measurable levels of HCN may be passed through the solutions when present. HCN results seen at subsequent units at other Southern Company plants firing similar coal showed conclusively that HCN levels were DL. As a result, these test were qualified for HCl and HF and were not reported for HCN. -CTM-033 - Reference method requires a matrix spike, but this was not performed. - Please also note that the values presented in this database and the values in the hard copy report will vary slightly. We expect these differences are due to the fact that the ERT database recalculates all values.

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### Monday, February 07, 2011 Page 4 of 7

### Sampling / Stack Data Results Summary

Location Stack - Method 26A Average Run Number 1 2 3 Test Date 2/25/2010 2/25/2010 2/25/2010 Run Start Time 6:55:00 AM 10:33:00 AM 2:00:00 PM

Run Finish Time 10:20:00 AM1:45:00 PM 5:15:00 PM Net Run Time, minutes 180 180 180 Dry Gas Meter Volume Sampled, dscf 104.025 103.970 103.235 103.743 Moisture Content of Stack Gas, % 12.92 13.00 13.21 13.043 Moisture Saturation at Stack Gas Temperature, % 11.80 12.04 12.17 12.003 Carbon Dioxide, % 11.53 11.44 11.45 11.473 Oxygen, % 6.45 6.4 6 6.283 Average Stack Gas Temperature, °F 119.33 120.03 120.42 119.927 Dry Volumetric Flow Rate, dry scfm 2,071,331.72,064,454.2 2,047,111.62,060,965.83 3 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,693,798.62,695,432.9 2,678,545.62,689,259.03 3 Percent Isokinetic of Sampling Rate, % 100.5 100.8 100.9 100.733 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



### Monday, February 07, 2011 Page 5 of 7

### Emissions Summary

Process Run Data Location: Stack - Method 26A Compound: Hydrogen Chloride Average RunNumber 1 2 3 Mass_mg 0.345 0.274 0.59 0.403 lb/mmBtuO2 1.03E-04 8.19E-05 1.73E-04 0.000 ppm 7.73E-02 6.14E-02 1.33E-01 0.091 

### Compound: Hydrogen Fluoride Average RunNumber 1 2 3 Mass_mg 0.237 0.149 0.194 0.193 lb/mmBtuO2 7.10E-05 4.45E-05 5.68E-05 0.000 ppm 9.67E-02 6.08E-02 7.98E-02 0.079



### Monday, February 07, 2011 Page 6 of 7

### Process Run Data

APCD Run Data

Process Lab Run Data Run Name Value UOM Comments Target Value 1 Gross Electric Output 933.06 MW 0 2 Gross Electric Output 933.06 MW 0 3 Gross Electric Output 933.06 MW 0



### Run Name Value UOM Comments 1 Coal Fuel Analysis 12601 Btu/lb 2 Coal Fuel Analysis 12595 Btu/lb 3 Coal Fuel Analysis 12568 Btu/lb

Monday, February 07, 2011 Page 7 of 7

### Sampling / Stack Data Results Detail

Location Stack - Method 26A Average Run Number 1 2 3 Test Date 2/25/2010 2/25/2010 2/25/2010 Run Start Time 6:55:00 AM10:33:00 AM 2:00:00 PM Run Finish Time 10:20:00 AM 1:45:00 PM 5:15:00 PM Net Traversing Points 36 36 36 Net Run Time, minutes 180 180 180 Nozzle Diameter, inches 0.215 0.215 0.215 0.215 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.996 0.996 0.996 0.996 Barometric Pressure, inches of Mercury 28.7 28.7 28.7 28.700 Average Orifice Meter Differential, inches H2O 1.29 1.29 1.28 1.287 Dry Gas Meter Volume Sampled, cubic feet 111.927 111.776 111.527 111.743 Average Dry Gas Meter Temperature, °F 84.56 84.11 86.75 85.140 Dry Gas Meter Volume Sampled, dscf 104.025 103.970 103.235 103.743 Total Moisture Liquid collected, g 328330.0000000 00001 333.8 330.600 Volume of Water Vapor, standard cubic feet 15.44 15.53 15.71 15.560 Moisture Content of Stack Gas, % 12.92 13.00 13.21 13.043 Moisture Saturation at Stack Gas Temperature, % 11.80 12.04 12.17 12.003 Dry Mole Fraction 0.882 0.8796 0.8783 0.880 Carbon Dioxide, % 11.53 11.44 11.45 11.473 Oxygen, % 6.45 6.4 6 6.283 Carbon Monoxide & Nitrogen, % 82.02 82.16 82.55 82.243 Fuel Factor 1.25 1.27 1.30 Dry Molecular Weight, lb/lb-Mole 30.10 30.09 30.07 30.087 Wet Molecular weight, lb/lb-Mole 28.87 28.81 28.79 28.823 Flue Gas Static Pressure, inches of H2O -1.05 -1.05 -1.05 -1.050 Absolute Flue Gas Pressure, inches of Mercury 28.62 28.62 28.62 28.620 Average Stack Gas Temperature, °F 119.33 120.03 120.42 119.927 Average Velocity Head, inches of H2O 0.6763305611 511830.674998546

7457370.665643088

600388 0.672 Average Stack Gas Velocity, feet/second 49.45 49.48 49.17 49.367 Stack Cross-Sectional Area, square feet 907.920 907.920 907.920 907.920 Dry Volumetric Flow Rate, dry scfm 2,071,331.7 2,064,454.2 2,047,111.62,060,965.8 33 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,693,798.6 2,695,432.9 2,678,545.62,689,259.0 33 Percent Isokinetic of Sampling Rate, % 100.5 100.8 100.9 100.733 Percent Excess Air, % 42.4 41.9 38.0 40.767 F-Factor, dscfm/MMBtu @ %O2 9780 9780 9780 9,780.000 Round Duct Diameter, inches 408 408 408 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 10640 10640 1064010,640.000 Fc 1800 1800 1800 1,800.000



### Monday, February 07, 2011 Page 8 of 7