### Name: Mike Hill Title: Plant Mana g e r Company: USG Interiors, Inc. Sign Date: Name: Randal J. T y sar Title: Senior Environmental En g ineer Company: BT Environmental Consultin g , Inc. Sign Date: Permitted Facility Representative / Da te Testing Company Representative / Date 

## USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test 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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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Facility Information: USG Interiors, Inc.

27384 Highway 61

Red Wing M 55066 Contact: Mike Hill Phone: 651-388-3513 ext 13 Fax: Email: Testing Company: Pace Analytical Services, Inc.

1700 Elm Street, Suite 200

Minneapolis M 55414 Contact: Terry Borgerding Phone: (612) 607-6374 Fax: Email: terry.borgerding@pacelabs.com

Air Permit Number:

4900007-003 AQ File No. 404A Permitted Source ID/Name: 4900007-003 AQ File No. 404A MN Permitted Maximum Process Rate: Max. Normal Operation Process Rate: NA Target Process Test Rate

Description of the source (including control equipment). Please see the attachments for source or process flow diagram:

USG produces mineral wool at its plant inRed Wing, Minnesota. Melting and fiberizing raw materials produce mineral wool. The major component is slag, which is a byproduct from the steel industry. Stone and other additives are used to change the melt chemistry to produce the best quality wool for production. The mineral wool is then sent to other facilities to be made into products such as ceiling tiles. USG has two cupolas for melting raw materials. A cupola is a vertical cylindrical shaft furnace used to melt incoming minerals and then direct the molten slag out of a discharge notch. Main emission sources involved in this process are the two cupolas, where the stone and slag are heated and melted with coke and the blow chambers where the wool fibers are collected. Pollution control equipment for the cupolas include a baghouse and thermal oxidizer. Industry/SCC/NAIS 327993

Sampling Location Information:

Test Parameter Information: AFS #: 2704900007 FRS #: 110000594401

SCC / Description 30501701 Industrial Processes - Mineral Products - Mineral Wool - Cupola

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 Afterburner Stack 66 1398 294 2 0 12 0 0

Target Parameter Test Method Number of Test Runs Test Run Duration Sample Points Comments Location


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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

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. Organic Condensible Particulate OTM - 27/28 3 180 0 Afterburner Stack Inorganic (Aqueous) Condensible Part. OTM - 27/28 3 180 0 Afterburner Stack Total PM2.5 OTM - 27/28 3 180 0 Afterburner Stack Filterable PM2.5 OTM - 27/28 3 180 0 Afterburner Stack Chromium Method 29 3 180 0 Afterburner Stack Arsenic Method 29 3 180 0 Afterburner Stack Antimony Method 29 3 180 0 Afterburner Stack Cadmium Method 29 3 180 0 Afterburner Stack Mercury Method 29 3 180 0 Afterburner Stack Cobalt Method 29 3 180 0 Afterburner Stack Lead Method 29 3 180 0 Afterburner Stack Manganese Method 29 3 180 0 Afterburner Stack Nickel Method 29 3 180 0 Afterburner Stack Filterable Particulate Method 29 3 180 0 Afterburner Stack Selenium Method 29 3 180 0 Afterburner Stack Beryllium Method 29 3 180 0 Afterburner Stack Chromium Method 0061 3 120 0 Afterburner Stack



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Sampling / Stack Data Results Summary
Location Afterburner Stack - Method 0061 Avera g e Run Number 2 3 4 Test Date 9/29/2010 9/30/2010 9/30/2010 Run Start Time 6:18:00 PM 6:55:00 AM 8:07:00 AM

Run Finish Time 8:24:00 PM 7:59:00 AM 9:16:00 AM

Net Run Time, minutes 120 60 60 Dry Gas Meter Volume Sampled, dscf 88.270 44.516 46.164 59.650 Moisture Content of Stack Gas, % 6.36 6.71 7.64 6.903 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 18.4 18 17.7 18.033 Oxygen, % 3.5 4.1 4.1 3.900 Average Stack Gas Temperature, °F 1,586.75 1,582.88 1,597.13 1,588.920 Dry Volumetric Flow Rate, dry scfm 16,206.9 16,433.4 16,868.5 16,502.933 Actual Wet Volumetric Flue Gas FlowRate, acfm 70,261.9 70,561.3 73,668.8 71,497.333 Percent Isokinetic of Sampling Rate, % 102.1 101.6 102.6 102.100 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Location Afterburner Stack - Method 29 Avera g e Run Number 1 2 3 Test Date 9/30/2010 9/30/2010 10/1/2010 Run Start Time 10:44:00 AM 2:15:00 PM 9:15:00 AM

Run Finish Time 1:52:00 PM 5:26:00 PM 12:24:00 PM

Net Run Time, minutes 180 180 180 Dry Gas Meter Volume Sampled, dscf 135.880 136.814 134.487 135.727 Moisture Content of Stack Gas, % 6.47 6.61 7.76 6.947 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 16.6 18.1 18.8 17.833 Oxygen, % 5.4 3.8 3.4 4.200 Average Stack Gas Temperature, °F 1,567.17 1,576.33 1,481.17 1,541.557 Dry Volumetric Flow Rate, dry scfm 17,030.3 16,978.4 16,650.6 16,886.433 Actual Wet Volumetric Flue Gas FlowRate, acfm 72,300.3 72,514.2 68,494.3 71,102.933 Percent Isokinetic of Sampling Rate, % 101.1 102.1 102.4 101.867 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Location Afterburner Stack - OTM - 27/28 Avera g e Run Number 1 2 3 Test Date 9/28/2010 9/28/2010 9/29/2010 Run Start Time 12:25:00 PM 4:45:00 PM 10:48:00 AM

Run Finish Time 3:30:00 PM 8:00:00 PM 1:43:00 PM

Net Run Time, minutes 167.8 188.3 119.2 Dry Gas Meter Volume Sampled, dscf 70.903 79.400 49.170 66.491 Moisture Content of Stack Gas, % 6.46 5.79 7.16 6.470 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 14.6 15.7 18 16.100 Oxygen, % 7.5 6.1 4.1 5.900 Average Stack Gas Temperature, °F 1,554.38 1,580.38 1,580.53 1,571.763 Dry Volumetric Flow Rate, dry scfm 17,172.4 16,978.1 16,702.7 16,951.067 Actual Wet Volumetric Flue Gas FlowRate, acfm 72,813.5 72,400.1 72,813.5 72,675.700 Percent Isokinetic of Sampling Rate, % 111.5 112.6 111.9 112.000 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Emissions Summary
Location: Afterburner Stack - Method 0061 Compound: Chromiu m A ve r age

RunNumber 2 3 4 Mass_mg 0.00034 0.0003 0.00031 0.000 Elb/hr 8.26E-06 1.46E-05 1.50E-05 0.000 mg/dscm 1.36E-04 2.38E-04 2.37E-04 0.000



### Location: Afterburner Stack - Method 29 Compound: Antimon y Average

RunNumber 1 2 3 Mass_mg 0.0027 0.0007 0.0005 0.001 Elb/hr 4.48E-05 1.15E-05 8.19E-06 0.000 mg/dscm 7.02E-04 1.81E-04 1.31E-04 0.000 

### Compound: Arsenic Average

RunNumber 1 2 3 Mass_mg 0.0693 0.1145 0.0789 0.088 Elb/hr 1.15E-03 1.88E-03 1.29E-03 0.001 mg/dscm 1.80E-02 2.96E-02 2.07E-02 0.023 

### Compound: Bery llium Average

RunNumber 1 2 3 Mass_mg 0.00006 0.00007 0.00003 0.000 Elb/hr 9.95E-07 1.15E-06 4.91E-07 0.000 mg/dscm 1.56E-05 1.81E-05 7.88E-06 0.000 

### Compound: Cadmium Average

RunNumber 1 2 3 Mass_mg 0.0002 0.0002 0.0002 0.000 Elb/hr 3.32E-06 3.28E-06 3.28E-06 0.000 mg/dscm 5.20E-05 5.16E-05 5.25E-05 0.000 

### Compound: Chromiu m Average

RunNumber 1 2 3 Mass_mg 0.50934 0.57244 0.53354 0.538 Elb/hr 8.44E-03 9.40E-03 8.74E-03 0.009 mg/dscm 1.32E-01 1.48E-01 1.40E-01 0.140 

### Compound: Cobal t Average

RunNumber 1 2 3 Mass_mg 0.0024 0.0026 0.0023 0.002 Elb/hr 3.98E-05 4.27E-05 3.77E-05 0.000 mg/dscm 6.24E-04 6.71E-04 6.04E-04 0.001



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Compound: Filterable Particulate A ve r age

RunNumber 1 2 3 Mass_mg 330 344 362 345.333 Elb/hr 5.47E+00 5.65E+00 5.93E+00 5.683 mg/dscm 8.58E+01 8.88E+01 9.51E+01 89.900 

### Compound: Lead A ve r age

RunNumber 1 2 3 Mass_mg 0.0069 0.0083 0.0067 0.007 Elb/hr 1.14E-04 1.36E-04 1.10E-04 0.000 mg/dscm 1.79E-03 2.14E-03 1.76E-03 0.002 

### Compound: Man g anese A ve r age

RunNumber 1 2 3 Mass_mg 0.26821 0.34621 0.13871 0.251 Elb/hr 4.45E-03 5.68E-03 2.27E-03 0.004 mg/dscm 6.97E-02 8.94E-02 3.64E-02 0.065 

### Compound: Mercury A ve r age

RunNumber 1 2 3 Mass_mg 0.0014 0.0014 0.0014 0.001 Elb/hr 2.32E-05 2.30E-05 2.29E-05 0.000 mg/dscm 3.64E-04 3.61E-04 3.68E-04 0.000 

### Compound: Nickel A ve r age

RunNumber 1 2 3 Mass_mg 0.27933 0.31133 0.29673 0.296 Elb/hr 4.63E-03 5.11E-03 4.86E-03 0.005 mg/dscm 7.26E-02 8.04E-02 7.79E-02 0.077 

### Compound: Selenium Average

RunNumber 1 2 3 Mass_mg 1.63114 2.45214 1.82314 1.969 Elb/hr 2.70E-02 4.03E-02 2.99E-02 0.032 mg/dscm 4.24E-01 6.33E-01 4.79E-01 0.512



### Location: Afterburner Stack - OTM - 27/28 Compound: Filterable PM2.5 Average

RunNumber 1 2 3 Mass_mg 169.5 295.3 243.4 236.067 Elb/hr 5.43E+00 8.35E+00 1.09E+01 8.227 mg/dscm 8.44E+01 1.31E+02 1.75E+02 130.133 

### Compound: Inorg anic ( A q ueous ) Condensible Pa Average

RunNumber 1 2 3


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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Mass_mg 16.9 14.8 5.8 12.500 Elb/hr 5.41E-01 4.19E-01 2.61E-01 0.407 mg/dscm 8.42E+00 6.58E+00 4.17E+00 6.390 

### Compound: Or g anic Condensible Particulate A ve r age

RunNumber 1 2 3 Mass_mg 4.8 12 0 5.600 Elb/hr 1.54E-01 3.39E-01 0.00E+00 0.164 mg/dscm 2.39E+00 5.34E+00 0.00E+00 2.577 

### Compound: Total PM2.5 A ve r age

RunNumber 1 2 3 Mass_mg 191.2 322.1 249.2 254.167 Elb/hr 6.13E+00 9.11E+00 1.12E+01 8.813 mg/dscm 9.52E+01 1.43E+02 1.79E+02 139.067



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Process Run Data

APCD Run Data

Process Lab Run Data

Run Name Value UOM Comments Target Value 1 Material Charged 0 Tons/hr M5/M29 R1 0 2 Material Charged 0 Tons/hr M5/M29 R2 0 3 Material Charged 0 Tons/hr M5/M29 R3 0 4 Material Charged 0 Tons/hr OTM27/28 R1 0 5 Material Charged 0 Tons/hr OTM27/28 R2 0 6 Material Charged 0 Tons/hr OTM27/28 R3 0 7 Material Charged 0 Tons/hr M0061 R1 0 8 Material Charged 0 Tons/hr M0061 R2 0 9 Material Charged 0 Tons/hr M0061 R3 0

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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Sampling / Stack Data Results Detail
Location Afterburner Stack - Method 0061 Avera g e Run Number 2 3 4 Test Date 9/29/2010 9/30/2010 9/30/2010 Run Start Time 6:18:00 PM 6:55:00 AM 8:07:00 AM Run Finish Time 8:24:00 PM 7:59:00 AM 9:16:00 AM Net Traversing Points 24 24 24 Net Run Time, minutes 120 60 60 Nozzle Diameter, inches 0.44 0.44 0.44 0.440 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.9992 0.9992 0.9992 0.999 Barometric Pressure, inches of Mercury 28.67 29 29 28.890 Average Orifice Meter Differential, inches H2O 2.02 2.01 2.17 2.067 Dry Gas Meter Volume Sampled, cubic feet 94.630 45.910 48.100 62.880 Average Dry Gas Meter Temperature, °F 84.77 70.06 75.73 76.853 Dry Gas Meter Volume Sampled, dscf 88.270 44.516 46.164 59.650 Total Moisture Liquid collected, g 127.4 68 81.1 92.167 Volume of Water Vapor, standard cubic feet 6.00 3.20 3.82 4.340 Moisture Content of Stack Gas, % 6.36 6.71 7.64 6.903 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9364 0.9329 0.9236 0.931 Carbon Dioxide, % 18.4 18 17.7 18.033 Oxygen, % 3.5 4.1 4.1 3.900 Carbon Monoxide & Nitrogen, % 78.1 77.9 78.2 78.067 Fuel Factor 0.95 0.93 0.95 Dry Molecular Weight, lb/lb-Mole 31.08 31.04 31.00 31.040 Wet Molecular weight, lb/lb-Mole 30.25 30.17 30.01 30.143 Flue Gas Static Pressure, inches of H2O -1.33 -1.33 -1.33 -1.330 Absolute Flue Gas Pressure, inch es of Mercury 28.57 28.90 28.90 28.790 Average Stack Gas Temperature, °F 1,586.75 1,582.88 1,597.13 1,588.920 Average Velocity Head, inches of H2O 0.1989511775 23112 0.202831240 681609 0.218327489 900893 0.207
Average Stack Gas Velocity, feet/second 49.29 49.50 51.68 50.157 Stack Cross-Sectional Area, square feet 23.758 23.758 23.758 23.758 Dry Volumetric Flow Rate, dry scfm 16,206.9 16,433.4 16,868.5 16,502.933 Actual Wet Volumetric Flue Gas FlowRate, acfm 70,261.9 70,561.3 73,668.8 71,497.333 Percent Isokinetic of Sampling Rate, % 102.1 101.6 102.6 102.100 Percent Excess Air, % 20.4 24.9 24.8 23.367 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Round Duct Diameter, inches 66 66 66 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Location Afterburner Stack - Method 29 Avera g e Run Number 1 2 3 Test Date 9/30/2010 9/30/2010 10/1/2010 Run Start Time 10:44:00 AM 2:15:00 PM 9:15:00 AM Run Finish Time 1:52:00 PM 5:26:00 PM 12:24:00 PM Net Traversing Points 24 24 24 Net Run Time, minutes 180 180 180 Nozzle Diameter, inches 0.437 0.437 0.437 0.437 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.9992 0.9992 0.9992 0.999 Barometric Pressure, inches of Mercury 29.03 29.03 29.09 29.050 Average Orifice Meter Differential, inches H2O 2.14 2.18 2.06 2.127 Dry Gas Meter Volume Sampled, cubic feet 144.200 146.420 141.630 144.083 Average Dry Gas Meter Temperature, °F 86.17 90.85 83.00 86.673 Dry Gas Meter Volume Sampled, dscf 135.880 136.814 134.487 135.727 Total Moisture Liquid collected, g 199.8 205.7 240.4 215.300 Volume of Water Vapor, standardcubic feet 9.40 9.68 11.32 10.133 Moisture Content of Stack Gas, % 6.47 6.61 7.76 6.947 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9353 0.9339 0.9224 0.931 Carbon Dioxide, % 16.6 18.1 18.8 17.833 Oxygen, % 5.4 3.8 3.4 4.200 Carbon Monoxide & Nitrogen, % 78 78.1 77.8 77.967 Fuel Factor 0.93 0.94 0.93 Dry Molecular Weight, lb/lb-Mole 30.87 31.05 31.14 31.020 Wet Molecular weight, lb/lb-Mole 30.04 30.19 30.12 30.117 Flue Gas Static Pressure, inches of H2O -1.33 -1.33 -1.33 -1.330 Absolute Flue Gas Pressure, inch es of Mercury 28.93 28.93 28.99 28.950 Average Stack Gas Temperature, °F 1,567.17 1,576.33 1,481.17 1,541.557 Average Velocity Head, inches of H2O 0.2138369491 35216 0.215216032 661051 0.201409156 107642 0.210
Average Stack Gas Velocity, feet/second 50.72 50.87 48.05 49.880 Stack Cross-Sectional Area, square feet 23.758 23.758 23.758 23.758 Dry Volumetric Flow Rate, dry scfm 17,030.3 16,978.4 16,650.6 16,886.433 Actual Wet Volumetric Flue Gas FlowRate, acfm 72,300.3 72,514.2 68,494.3 71,102.933 Percent Isokinetic of Sampling Rate, % 101.1 102.1 102.4 101.867 Percent Excess Air, % 35.5 22.6 19.8 25.967 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Round Duct Diameter, inches 66 66 66 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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### USG Interiors, Inc. Red Wing Minnesota Cupola Residual Risk Emissions Test

Location Afterburner Stack - OTM - 27/28 Avera g e Run Number 1 2 3 Test Date 9/28/2010 9/28/2010 9/29/2010 Run Start Time 12:25:00 PM 4:45:00 PM 10:48:00 AM Run Finish Time 3:30:00 PM 8:00:00 PM 1:43:00 PM Net Traversing Points 12 12 8 Net Run Time, minutes 167.8 188.3 119.2 Nozzle Diameter, inches 0.31 0.31 0.31 0.310 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.9996 0.9996 0.9996 1.000 Barometric Pressure, inches of Mercury 28.88 28.88 28.67 28.810 Average Orifice Meter Differential, inches H2O 0.64 0.64 0.62 0.633 Dry Gas Meter Volume Sampled, cubic feet 76.070 85.540 53.020 71.543 Average Dry Gas Meter Temperature, °F 87.46 89.73 86.20 87.797 Dry Gas Meter Volume Sampled, dscf 70.903 79.400 49.170 66.491 Total Moisture Liquid collected, g 104 103.7 80.6 96.100 Volume of Water Vapor, standard cubic feet 4.90 4.88 3.79 4.523 Moisture Content of Stack Gas, % 6.46 5.79 7.16 6.470 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9354 0.9421 0.9284 0.935 Carbon Dioxide, % 14.6 15.7 18 16.100 Oxygen, % 7.5 6.1 4.1 5.900 Carbon Monoxide & Nitrogen, % 77.9 78.2 77.9 78.000 Fuel Factor 0.92 0.94 0.93 Dry Molecular Weight, lb/lb-Mole 30.64 30.76 31.04 30.813 Wet Molecular weight, lb/lb-Mole 29.82 30.02 30.11 29.983 Flue Gas Static Pressure, inches of H2O -1.33 -1.33 -1.33 -1.330 Absolute Flue Gas Pressure, inch es of Mercury 28.78 28.78 28.57 28.710 Average Stack Gas Temperature, °F 1,554.38 1,580.38 1,580.53 1,571.763 Average Velocity Head, inches of H2O 0.2155658683 85948 0.211829975 236527 0.213326152 584278 0.214
Average Stack Gas Velocity, feet/second 51.08 50.79 51.08 50.983 Stack Cross-Sectional Area, square feet 23.758 23.758 23.758 23.758 Dry Volumetric Flow Rate, dry scfm 17,172.4 16,978.1 16,702.7 16,951.067 Actual Wet Volumetric Flue Gas FlowRate, acfm 72,813.5 72,400.1 72,813.5 72,675.700 Percent Isokinetic of Sampling Rate, % 111.5 112.6 111.9 112.000 Percent Excess Air, % 57.4 41.9 24.9 41.400 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Round Duct Diameter, inches 66 66 66 Rectangular Duct Width, inches 0 0 0 Rectangular Duct Length, inches 0 0 0 Fw 0 0 0 0.000 Fc 0 0 0 0.000



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