Name:

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

### Midwest Generation Homer City Unit 3

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.

Tuesday, February 08, 2011 Page 1 of 11Midwest Generation Homer City Unit 3

Facility Information: Edison Mission Energy - Homer City Gener 1750 Power Plant Road

Homer City PA15748 Contact:Gary Cline Phone:724-479-6255 Fax: 724-479-6300 Email: gcline@mwgen.com Testing Company: Avogadro Environmental Corporation 1350 Sullivan Trail, Suite A

Easton PA18040 Contact:Thomas Mattei Phone:610-559-8776 x 103 Fax: 610-559-8913 Email:tmattei@avogadro.net

Air Permit Number: Title V 32-00055 Permitted Source ID/Name: Homer City Unit 3 3122 Permitted Maximum Process Rate: 7260 MMBtu/hr Max. Normal Operation Process Rate: 6600 MMBtu/hr Target Process Test Rate 6215 MMBtu/hr

Description of the source (including control equipment). Please see the attachments for source or process flow diagram: Homer City Generating Station includes three coal-fired electrical generating units with a total capacity of 2,100 gross megawatts. Unit 3 is a Babcock & Wilcox wall-fired boiler with a heat output rating of 7,260 MMBTU/hr with an 854 foot stack. The continuous emissions monitors are located at the 570 foot level in the stack. Unit 3 also has a wet limestone scrubber for sulfur dioxide (SO2) emissions controls and low NOx burner and a SCR for NOx controls and a Cold ESP for PM controls. Industry/SCC/NAIS221112

Sampling Location Information:

Test Parameter Information: AFS #:4206300002 FRS #:110000330339

SCC / Description10100202 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 324 3444 4512 4 0 12 0 0

Target Parameter Test Method Number of

Test RunsTest Run

DurationSample

Points Comments Location% H2O Method 1 - 4 3 60 0 run durations range from 60-66 minute Stack Exit

Tuesday, February 08, 2011 Page 2 of 11Midwest Generation Homer City Unit 3

Hydrogen Fluoride Method 26A 3 60 0 The samples were collected in a combined train with HCN using NaOH impingers only.
Chlorine data for Method 26A analysis is not available from the laboratory.
Method 26A & CTM033 The MDLs are determined by the analysis of at least seven replicate standards at a concentration near the expected MDL. To determine the MDL value, the standard deviation of the replicate analyses is calculated and that number is multiplied by the Student t factor that corresponds to the number of replicates analyzed. The MDL value should meet the criteria stated in the CFR Title 40, Part 136 B.
If the MDL determined does not meet these criteria, a default MDL value will be used which is 1/10 of the concentration of the standard used to produce the MDL value. Stack Exit

Tuesday, February 08, 2011 Page 3 of 11Midwest Generation Homer City Unit 3

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. There were no modifications or deviations to the applicable test methods.

Hydrogen Chloride Method 26A 3 60 0 The samples were collected in a combined train with HCN using NaOH impingers only.
Chlorine data for Method 26A analysis is not available from the laboratory.
Method 26A & CTM033 The MDLs are determined by the analysis of at least seven replicate standards at a concentration near the expected MDL. To determine the MDL value, the standard deviation of the replicate analyses is calculated and that number is multiplied by the Student t factor that corresponds to the number of replicates analyzed. The MDL value should meet the criteria stated in the CFR Title 40, Part 136 B.
If the MDL determined does not meet these criteria, a default MDL value will be used which is 1/10 of the concentration of the standard used to produce the MDL value. Stack Exit

Co2 Method 3A CO2 3 60 0 run durations range from 60-66 minute Stack Exit

O2 Method 3A O2 3 60 0 run durations range from 60-66 minutes Stack Exit

Tuesday, February 08, 2011 Page 4 of 11Midwest Generation Homer City Unit 3

Sampling / Stack Data Results Summary LocationStack Exit - Method 26A Average Run Number M26A-1 M26A-2 M26A-3 Test Date 6/3/2010 6/3/2010 6/3/2010 Run Start Time 7:30:00 AM 9:20:00 AM11:05:00 AM

Run Finish Time 8:55:00 AM 10:46:00 AM12:25:00 PM
Net Run Time, minutes 60 60 60 Dry Gas Meter Volume Sampled, dscf 49.583 49.464 47.076 48.708 Moisture Content of Stack Gas, % 9.18 6.27 7.31 7.587 Moisture Saturation at Stack Gas Temperature, % 13.82 14.12 14.15 14.030 Carbon Dioxide, % 12.427 12.422 12.381 12.410 Oxygen, % 7.044 7.039 6.962 7.015 Average Stack Gas Temperature, °F 124.00 124.85 124.92 124.590 Dry Volumetric Flow Rate, dry scfm 1,788,636.81,853,221.3 1,824,947.81,822,268.63 3 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,343,582.12,352,857.5 2,343,238.62,346,559.40 0 Percent Isokinetic of Sampling Rate, % 102.1 97.4 94.1 97.867 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

Tuesday, February 08, 2011 Page 5 of 11Midwest Generation Homer City Unit 3

Emissions Summary

Process Run Data Location: Stack Exit - Method 26A Compound: Hydrogen Chloride Average RunNumber M26A-1 M26A-2 M26A-3 Mass_mg 0.475 0.577 0.768 0.607 lb/mmBtuO2 3.12E-04 3.79E-04 5.27E-04 0.000 Compound: Hydrogen Fluoride Average RunNumber M26A-1 M26A-2 M26A-3 Mass_mg 0.497 0.48 0.522 0.500 lb/mmBtuO2 3.26E-04 3.15E-04 3.59E-04 0.000

Tuesday, February 08, 2011 Page 6 of 11Midwest Generation Homer City Unit 3

Process Run Data

Run Name Value UOM Comments Target Value 1 Coal Burned 0.2541000 Tons/hr Run 1 for HCN, HF, HCl: 0730- 0855 1 Flue Gas Flow Rate 1512.5 dscfm Run 1 for HCN, HF, HCl: 0730- 0855 1 Flue Gas Carbon Dioxide Content 10.63 % Run 1 for HCN, HF, HCl: 0730- 0855 1 Flue Gas Sampling Point Temperature 128 Deg F Run 1 for HCN, HF, HCl: 0730- 0855 1 Flue Gas Pressure 0.93 atm Run 1 for HCN, HF, HCl: 0730- 0855 1 Standard Pressure 1 atm Run 1 for HCN, HF, HCl: 0730- 0855 1 Standard Temperature 68 Deg F Run 1 for HCN, HF, HCl: 0730- 0855 1 Unit Gross Electrical Output 693 Mwe Run 1 for HCN, HF, HCl: 0730- 0855 1 Average Heat Input 6209.4MMBtu/hr Run 1 for HCN, HF, HCl: 0730- 0855 1 Steam Output 3765 1000 lbs/hr Run 1 for HCN, HF, HCl: 0730- 0855 1 Unit Net Electric Generation 639 MWh Run 1 for HCN, HF, HCl: 0730- 0855 1 Pressure Drop across FGD 5.37 in H20 Run 1 for HCN, HF, HCl: 0730- 0855 1 FGD Scruber Liquor Flow Rate 274.1 gals/min Run 1 for HCN, HF, HCl: 0730- 0855 1 Flue Gas Oxygen Content 6.94 % Run 1 for HCN, HF, HCl: 0730- 0855 1 Flue Gas Moisture Content 13.82 % Run 1 for HCN, HF, HCl: 0730- 0855
Tuesday, February 08, 2011 Page 7 of 11Midwest Generation Homer City Unit 3

2 Coal Burned 0.2561000 Tons/hr Run 2 for HCN, HF, HCl: 0920- 1046 2 Flue Gas Flow Rate 1508.1 dscfm Run 2 for HCN, HF, HCl: 0920- 1046 2 Flue Gas Carbon Dioxide Content 10.62 % Run 2 for HCN, HF, HCl: 0920- 1046 2 Flue Gas Sampling Point Temperature 128 Deg F Run 2 for HCN, HF, HCl: 0920- 1046 2 Flue Gas Pressure 0.93 atm Run 2 for HCN, HF, HCl: 0920- 1046 2 Standard Pressure 1 atm Run 2 for HCN, HF, HCl: 0920- 1046 2 Standard Temperature 68 Deg F Run 2 for HCN, HF, HCl: 0920- 1046 2 Unit Gross Electrical Output 692 Mwe Run 2 for HCN, HF, HCl: 0920- 1046 2 Average Heat Input 6211.8MMBtu/hr Run 2 for HCN, HF, HCl: 0920- 1046 2 Steam Output 3775 1000 lbs/hr Run 2 for HCN, HF, HCl: 0920- 1046 2 Unit Net Electric Generation 642 MWh Run 2 for HCN, HF, HCl: 0920- 1046 2 Pressure Drop across FGD 5.34 in H20 Run 2 for HCN, HF, HCl: 0920- 1046 2 FGD Scruber Liquor Flow Rate 267.9 gals/min Run 2 for HCN, HF, HCl: 0920- 1046 2 Flue Gas Oxygen Content 6.93 % Run 2 for HCN, HF, HCl: 0920- 1046 2 Flue Gas Moisture Content 14.12 % Run 2 for HCN, HF, HCl: 0920- 1046 3 Coal Burned 0.2561000 Tons/hr Run 3 for HCN, HF, HCl: 1105- 1225

Tuesday, February 08, 2011 Page 8 of 11Midwest Generation Homer City Unit 3

APCD Run Data 3 Flue Gas Flow Rate 1505.8 dscfm Run 3 for HCN, HF, HCl: 1105- 1225 3 Flue Gas Carbon Dioxide Content 10.7 % Run 3 for HCN, HF, HCl: 1105- 1225Run 3 for HCN, HF, HCl: 1105-1225 3 Flue Gas Sampling Point Temperature 128 Deg F Run 3 for HCN, HF, HCl: 1105- 1225 3 Flue Gas Pressure 0.93 atm Run 3 for HCN, HF, HCl: 1105- 1225 3 Standard Pressure 1 atm Run 3 for HCN, HF, HCl: 1105- 1225 3 Standard Temperature 68 Deg F Run 3 for HCN, HF, HCl: 1105- 1225 3 Unit Gross Electrical Output 694 Mwe Run 3 for HCN, HF, HCl: 1105- 1225 3 Average Heat Input 6223.3MMBtu/hr Run 3 for HCN, HF, HCl: 1105- 1225 3 Steam Output 3780 1000 lbs/hr Run 3 for HCN, HF, HCl: 1105- 1225 3 Unit Net Electric Generation 644 MWh Run 3 for HCN, HF, HCl: 1105- 1225 3 Pressure Drop across FGD 5.35 in H20 Run 3 for HCN, HF, HCl: 1105- 1225 3 FGD Scruber Liquor Flow Rate 271 gals/min Run 3 for HCN, HF, HCl: 1105- 1225 3 Flue Gas Oxygen Content 6.9 % Run 3 for HCN, HF, HCl: 1105- 1225 3 Flue Gas Moisture Content 14.15 % Run 3 for HCN, HF, HCl: 1105- 1225

Run Name Value UOM Comments Target Value 1 LOW NOX BURNERS 0 0 Tuesday, February 08, 2011 Page 9 of 11Midwest Generation Homer City Unit 3

Process Lab Run Data 1 0 0 1 SCR (SELECTIVE CATALYTIC REDUCTION) 0 0 1 ELECTROSTATIC PRECIPITATOR 0 0 1 WET SCRUBBER (Flue Gas Desulfurization) 0 0

Run Name ValueUOM Comments 1 Fuel Higher Heating Value 0 Btu/lb 1 Fuel Moisture 0 % 1 Fuel Mercury Content 0 ppm 1 Fuel Cadmium Content 0 ppm 1 Ultimate/Proximate Analysis 0 1 Fuel Nickel Content 0 ppm 1 Fuel Arsenic Content 0 ppm 1 Fuel Chromium Content 0 ppm 1 Fuel Beryllium Content 0 ppm 1 Fuel Lead Content 0 ppm 1 Fuel Manganese Content 0 ppm 1 Fuel Chlorine Content 0 ppm 1 Fuel Fluorine Content 0 ppm

Tuesday, February 08, 2011 Page 10 of 11Midwest Generation Homer City Unit 3

Sampling / Stack Data Results Detail LocationStack Exit - Method 26A Average Run Number M26A-1 M26A-2 M26A-3 Test Date 6/3/2010 6/3/2010 6/3/2010 Run Start Time 7:30:00 AM9:20:00 AM11:05:00 AM Run Finish Time 8:55:00 AM10:46:00 AM12:25:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 60 60 60 Nozzle Diameter, inches 0.218 0.219 0.219 0.219 Pitot Tube Coefficient 0.86 0.86 0.86 0.860 Dry Gas Meter Calibration Factor 1.005 1.005 1.005 1.005 Barometric Pressure, inches of Mercury 27.85 27.89 27.89 27.877 Average Orifice Meter Differential, inches H2O 2.48 2.45 2.32 2.417 Dry Gas Meter Volume Sampled, cubic feet 55.513 55.618 53.060 54.730 Average Dry Gas Meter Temperature, °F 96.62 99.77 100.92 99.103 Dry Gas Meter Volume Sampled, dscf 49.583 49.464 47.076 48.708 Total Moisture Liquid collected, g 106.5 70.29 78.81 85.200 Volume of Water Vapor, standard cubic feet 5.01 3.31 3.71 4.010 Moisture Content of Stack Gas, % 9.18 6.27 7.31 7.587 Moisture Saturation at Stack Gas Temperature, % 13.82 14.12 14.15 14.030 Dry Mole Fraction 0.9082 0.9373 0.9269 0.924 Carbon Dioxide, % 12.427 12.422 12.381 12.410 Oxygen, % 7.044 7.039 6.962 7.015 Carbon Monoxide & Nitrogen, % 80.529 80.539 80.657 80.575 Fuel Factor 1.11 1.12 1.13 Dry Molecular Weight, lb/lb-Mole 30.27 30.27 30.26 30.267 Wet Molecular weight, lb/lb-Mole 29.14 29.50 29.36 29.333 Flue Gas Static Pressure, inches of H2O -0.5 -0.5 -0.6 -0.533 Absolute Flue Gas Pressure, inches of Mercury 27.81 27.85 27.85 27.837 Average Stack Gas Temperature, °F 124.00 124.85 124.92 124.590 Average Velocity Head, inches of H2O 1.1946891469 60951.218920554

401621.203339472

85221 1.206 Average Stack Gas Velocity, feet/second 68.22 68.49 68.21 68.307 Stack Cross-Sectional Area, square feet 572.555 572.555 572.555 572.555 Dry Volumetric Flow Rate, dry scfm 1,788,636.81,853,221.3 1,824,947.81,822,268.6 33 Actual Wet Volumetric Flue Gas Flow Rate, acfm 2,343,582.12,352,857.5 2,343,238.62,346,559.4 00 Percent Isokinetic of Sampling Rate, % 102.1 97.4 94.1 97.867 Percent Excess Air, % 49.6 49.5 48.6 49.233 F-Factor, dscfm/MMBtu @ %O2 9780 9780 97809,780.000 Round Duct Diameter, inches 324 324 324 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 10640 10640 1064010,640.000 Fc 1800 1800 18001,800.000

Tuesday, February 08, 2011 Page 11 of 11