### Name: Scott Curry Title: Plant Manag er 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. Walworth, Wisconsi n 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. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Facility Information: USG Interiors, Inc.

208 Adeline Street

Walworth WI 53184 Contact: Scott Curry Phone: 262-275-2151 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:

265006830-P01 FID 265006830 Permitted Source ID/Name: 265006830-P01 FID 265006830 WI Permitted Maximum Process Rate:

NA 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 in Walworth. Mineral wool is produced by melting and fiberizing raw materials. 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 produc tion. The plant has a cupola 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 source involved in this process is the cupola, where the stone and slag are heated and melted with coke. Pollution control equipment for the cupola includes a baghouse and thermal oxidizer which includes a heat exchanger. Industry/SCC/NAIS 327993

Sampling Location Information:

Test Parameter Information: AFS #: 5512700004 FRS #: 110000417923

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 41.5 324 452 2 0 12 0 0

Target Parameter Test Method Number of Test Runs Test Run Duration Sample Points Comments Location Org anic Condensible OTM - 27/28 3 180 0 Afterburner 

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### USG Interiors, Inc. Walworth, Wisconsi n 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. Particulate 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 Beryllium Method 29 3 180 0 Afterburner Stack Lead Method 29 3 180 0 Afterburner Stack Selenium Method 29 3 180 0 Afterburner Stack Filterable Particulate Method 29 3 180 0 Afterburner Stack Nickel Method 29 3 180 0 Afterburner Stack Manganese Method 29 3 180 0 Afterburner Stack Cobalt Method 29 3 180 0 Afterburner Stack Cadmium Method 29 3 180 0 Afterburner Stack Chromium Method 0061 3 180 0 Afterburner Stack



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### USG Interiors, Inc. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Sampling / Stack Data Results Summary
Location Afterburner Stack - Method 0061 Avera g e Run Number 1A 2 3 Test Date 9/23/2010 9/23/2010 9/23/2010 Run Start Time 9:23:00 AM 11:46:00 AM 1:44:00 PM

Run Finish Time 10:48:00 AM 12:51:00 PM 2:44:00 PM

Net Run Time, minutes 60 65 65 Dry Gas Meter Volume Sampled, dscf 35.470 36.309 34.833 35.537 Moisture Content of Stack Gas, % 5.03 4.92 5.02 4.990 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 6.12 6.21 5.66 5.997 Oxygen, % 13.73 13.62 14.18 13.843 Average Stack Gas Temperature, °F 269.33 291.58 300.25 287.053 Dry Volumetric Flow Rate, dry scfm 13,515.0 13,830.9 13,332.4 13,559.433 Actual Wet Volumetric Flue Gas FlowRate, acfm 20,379.1 21,466.8 20,953.9 20,933.267 Percent Isokinetic of Sampling Rate, % 100.3 92.6 92.2 95.033 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. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Location Afterburner Stack - Method 29 Avera g e Run Number 1 2 3 Test Date 9/22/2010 9/22/2010 9/22/2010 Run Start Time 7:35:00 AM 12:24:00 PM 4:32:00 PM

Run Finish Time 10:53:00 AM 3:43:00 PM 8:00:00 PM

Net Run Time, minutes 180 180 180 Dry Gas Meter Volume Sampled, dscf 145.585 148.044 151.353 148.327 Moisture Content of Stack Gas, % 4.63 4.17 4.69 4.497 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 5.71 5.8 6.44 5.983 Oxygen, % 14.45 14.3 13.68 14.143 Average Stack Gas Temperature, °F 282.00 284.79 284.04 283.610 Dry Volumetric Flow Rate, dry scfm 14,218.2 14,477.5 14,557.1 14,417.600 Actual Wet Volumetric Flue Gas FlowRate, acfm 21,675.3 22,047.2 22,267.0 21,996.500 Percent Isokinetic of Sampling Rate, % 100.0 99.9 101.5 100.467 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. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Location Afterburner Stack - OTM - 27/28 Avera g e Run Number 1 2 3 Test Date 9/22/2010 9/22/2010 9/22/2010 Run Start Time 7:35:00 AM 12:24:00 PM 4:32:00 PM

Run Finish Time 11:08:00 AM 4:00:00 PM 8:12:00 PM

Net Run Time, minutes 206.8 204.1 202.9 Dry Gas Meter Volume Sampled, dscf 78.491 76.178 78.504 77.724 Moisture Content of Stack Gas, % 3.81 3.57 4.41 3.930 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Carbon Dioxide, % 5.71 5.8 6.44 5.983 Oxygen, % 14.45 14.3 13.68 14.143 Average Stack Gas Temperature, °F 281.86 285.14 284.19 283.730 Dry Volumetric Flow Rate, dry scfm 14,824.2 14,821.8 14,630.2 14,758.733 Actual Wet Volumetric Flue Gas FlowRate, acfm 22,402.3 22,441.8 22,317.8 22,387.300 Percent Isokinetic of Sampling Rate, % 89.5 88.0 92.4 89.967 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. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

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

RunNumber 1A 2 3 Mass_mg 0.00014 0.00016 0.00016 0.000 Elb/hr 7.06E-06 8.06E-06 8.10E-06 0.000 mg/dscm 1.39E-04 1.56E-04 1.62E-04 0.000


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

RunNumber 1 2 3 Mass_mg 0.00428 0.00031 0.000272 0.002 Elb/hr 5.53E-05 4.01E-06 3.46E-06 0.000 mg/dscm 1.04E-03 7.40E-05 6.35E-05 0.000 

### Compound: Arsenic Average

RunNumber 1 2 3 Mass_mg 0.06352 0.05417 0.06026 0.059 Elb/hr 8.21E-04 7.01E-04 7.67E-04 0.001 mg/dscm 1.54E-02 1.29E-02 1.41E-02 0.014 

### Compound: Bery llium Average

RunNumber 1 2 3 Mass_mg 0.00005 0.00005 0.00005 0.000 Elb/hr 6.46E-07 6.47E-07 6.36E-07 0.000 mg/dscm 1.21E-05 1.19E-05 1.17E-05 0.000 

### Compound: Cadmium Average

RunNumber 1 2 3 Mass_mg 0.0012 0.00173 0.00116 0.001 Elb/hr 1.55E-05 2.24E-05 1.48E-05 0.000 mg/dscm 2.91E-04 4.13E-04 2.71E-04 0.000 

### Compound: Chromiu m Average

RunNumber 1 2 3 Mass_mg 0.002822 0.002072 0.001212 0.002 Elb/hr 3.65E-05 2.68E-05 1.54E-05 0.000 mg/dscm 6.85E-04 4.94E-04 2.83E-04 0.000 

### Compound: Cobal t Average

RunNumber 1 2 3 Mass_mg 0.001074 0.000207 0.000519 0.001 Elb/hr 1.39E-05 2.68E-06 6.60E-06 0.000 mg/dscm 2.61E-04 4.94E-05 1.21E-04 0.000



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### USG Interiors, Inc. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Compound: Filterable Particulate A ve r age

RunNumber 1 2 3 Mass_mg 11.3 3.1 5.1 6.500 Elb/hr 1.46E-01 4.01E-02 6.49E-02 0.084 mg/dscm 2.74E+00 7.40E-01 1.19E+00 1.557 

### Compound: Lead A ve r age

RunNumber 1 2 3 Mass_mg 0.00398 0.00318 0.00127 0.003 Elb/hr 5.14E-05 4.11E-05 1.62E-05 0.000 mg/dscm 9.66E-04 7.59E-04 2.96E-04 0.001 

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

RunNumber 1 2 3 Mass_mg 0.00211 0.00663 0.00089 0.003 Elb/hr 2.73E-05 8.58E-05 1.13E-05 0.000 mg/dscm 5.12E-04 1.58E-03 2.08E-04 0.001 

### Compound: Nickel A ve r age

RunNumber 1 2 3 Mass_mg 0.0002 0.0002 0.0002 0.000 Elb/hr 2.58E-06 2.59E-06 2.54E-06 0.000 mg/dscm 4.85E-05 4.77E-05 4.67E-05 0.000 

### Compound: Selenium A ve r age

RunNumber 1 2 3 Mass_mg 1.277568 1.152968 1.231068 1.221 Elb/hr 1.65E-02 1.49E-02 1.57E-02 0.016 mg/dscm 3.10E-01 2.75E-01 2.87E-01 0.291


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

RunNumber 1 2 3 Mass_mg 6.49 7.61 8.03 7.377 Elb/hr 1.62E-01 1.96E-01 1.98E-01 0.185 mg/dscm 2.92E+00 3.53E+00 3.61E+00 3.353 

### Compound: Inorg anic ( A queous ) Condensible Pa Average

RunNumber 1 2 3 Mass_mg 2.22 17.4 23.1 14.240 Elb/hr 5.55E-02 4.48E-01 5.69E-01 0.358 mg/dscm 9.99E-01 8.07E+00 1.04E+01 6.490 

### Compound: Or g anic Condensible Particulate Average

RunNumber 1 2 3 

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### USG Interiors, Inc. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Mass_mg 24.1 23.7 11.6 19.800 Elb/hr 6.02E-01 6.10E-01 2.86E-01 0.499 mg/dscm 1.08E+01 1.10E+01 5.22E+00 9.007 

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

RunNumber 1 2 3 Mass_mg 32.81 48.71 42.73 41.417 Elb/hr 8.20E-01 1.25E+00 1.05E+00 1.040 mg/dscm 1.48E+01 2.26E+01 1.92E+01 18.867



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### USG Interiors, Inc. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Process Run Data

APCD Run Data

Process Lab Run Data

Run Name Value UOM Comments Target Value 1 Material Produced 0 Tons/hr M5/29 R1 0 2 Material Produced 0 Tons/hr M5/29 R2 0 3 Material Produced 0 Tons/hr M5/29 R3 0 4 Material Produced 0 Tons/hr OTM27/28 R1 0 5 Material Produced 0 Tons/hr OTM27/28 R2 0 6 Material Produced 0 Tons/hr OTM27/28 R3 0 7 Material Produced 0 Tons/hr M0061 R1 0 8 Material Produced 0 Tons/hr M0061 R2 0 9 Material Produced 0 Tons/hr M0061 R3 0

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### USG Interiors, Inc. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Sampling / Stack Data Results Detail
Location Afterburner Stack - Method 0061 Avera g e Run Number 1A 2 3 Test Date 9/23/2010 9/23/2010 9/23/2010 Run Start Time 9:23:00 AM 11:46:00 AM 1:44:00 PM Run Finish Time 10:48:00 AM 12:51:00 PM 2:44:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 60 65 65 Nozzle Diameter, inches 0.274 0.274 0.274 0.274 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.9948 0.9948 0.9948 0.995 Barometric Pressure, inches of Mercury 28.88 28.88 28.88 28.880 Average Orifice Meter Differential, inches H2O 1.32 1.39 1.27 1.327 Dry Gas Meter Volume Sampled, cubic feet 37.710 38.720 36.910 37.780 Average Dry Gas Meter Temperature, °F 80.83 82.58 78.96 80.790 Dry Gas Meter Volume Sampled, dscf 35.470 36.309 34.833 35.537 Total Moisture Liquid collected, g 40 40 39 39.667 Volume of Water Vapor, standard cubic feet 1.88 1.88 1.84 1.867 Moisture Content of Stack Gas, % 5.03 4.92 5.02 4.990 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9497 0.9508 0.9498 0.950 Carbon Dioxide, % 6.12 6.21 5.66 5.997 Oxygen, % 13.73 13.62 14.18 13.843 Carbon Monoxide & Nitrogen, % 80.15 80.17 80.16 80.160 Fuel Factor 1.17 1.17 1.19 Dry Molecular Weight, lb/lb-Mole 29.53 29.54 29.47 29.513 Wet Molecular weight, lb/lb-Mole 28.95 28.97 28.89 28.937 Flue Gas Static Pressure, inches of H2O -0.27 -0.27 -0.27 -0.270 Absolute Flue Gas Pressure, inch es of Mercury 28.86 28.86 28.86 28.860 Average Stack Gas Temperature, °F 269.33 291.58 300.25 287.053 Average Velocity Head, inches of H2O 0.2904044838 48226 0.312984703 17556 0.293933754 44438 0.299
Average Stack Gas Velocity, feet/second 36.16 38.09 37.18 37.143 Stack Cross-Sectional Area, square feet 9.393 9.393 9.393 9.393 Dry Volumetric Flow Rate, dry scfm 13,515.0 13,830.9 13,332.4 13,559.433 Actual Wet Volumetric Flue Gas FlowRate, acfm 20,379.1 21,466.8 20,953.9 20,933.267 Percent Isokinetic of Sampling Rate, % 100.3 92.6 92.2 95.033 Percent Excess Air, % 184.8 180.5 203.1 189.467 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Round Duct Diameter, inches 41.5 41.5 41.5 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. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Location Afterburner Stack - Method 29 Avera g e Run Number 1 2 3 Test Date 9/22/2010 9/22/2010 9/22/2010 Run Start Time 7:35:00 AM 12:24:00 PM 4:32:00 PM Run Finish Time 10:53:00 AM 3:43:00 PM 8:00:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 180 180 180 Nozzle Diameter, inches 0.313 0.313 0.313 0.313 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.9948 0.9948 0.9948 0.995 Barometric Pressure, inches of Mercury 28.94 28.94 28.94 28.940 Average Orifice Meter Differential, inches H2O 2.46 2.63 2.66 2.583 Dry Gas Meter Volume Sampled, cubic feet 154.010 157.890 160.200 157.367 Average Dry Gas Meter Temperature, °F 80.81 85.46 81.38 82.550 Dry Gas Meter Volume Sampled, dscf 145.585 148.044 151.353 148.327 Total Moisture Liquid collected, g 150 137 158 148.333 Volume of Water Vapor, standard cubic feet 7.06 6.45 7.44 6.983 Moisture Content of Stack Gas, % 4.63 4.17 4.69 4.497 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9537 0.9583 0.9531 0.955 Carbon Dioxide, % 5.71 5.8 6.44 5.983 Oxygen, % 14.45 14.3 13.68 14.143 Carbon Monoxide & Nitrogen, % 79.84 79.9 79.88 79.873 Fuel Factor 1.13 1.14 1.12 Dry Molecular Weight, lb/lb-Mole 29.49 29.50 29.58 29.523 Wet Molecular weight, lb/lb-Mole 28.96 29.02 29.04 29.007 Flue Gas Static Pressure, inches of H2O -0.27 -0.27 -0.27 -0.270 Absolute Flue Gas Pressure, inch es of Mercury 28.92 28.92 28.92 28.920 Average Stack Gas Temperature, °F 282.00 284.79 284.04 283.610 Average Velocity Head, inches of H2O 0.3237778070 34933 0.334363892 932055 0.341677779 423139 0.333
Average Stack Gas Velocity, feet/second 38.46 39.12 39.51 39.030 Stack Cross-Sectional Area, square feet 9.393 9.393 9.393 9.393 Dry Volumetric Flow Rate, dry scfm 14,218.2 14,477.5 14,557.1 14,417.600 Actual Wet Volumetric Flue Gas FlowRate, acfm 21,675.3 22,047.2 22,267.0 21,996.500 Percent Isokinetic of Sampling Rate, % 100.0 99.9 101.5 100.467 Percent Excess Air, % 218.0 210.5 184.7 204.400 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Round Duct Diameter, inches 41.5 41.5 41.5 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. Walworth, Wisconsi n Cupola Residual Risk Emissions Test

Location Afterburner Stack - OTM - 27/28 Avera g e Run Number 1 2 3 Test Date 9/22/2010 9/22/2010 9/22/2010 Run Start Time 7:35:00 AM 12:24:00 PM 4:32:00 PM Run Finish Time 11:08:00 AM 4:00:00 PM 8:12:00 PM Net Traversing Points 12 12 12 Net Run Time, minutes 206.8 204.1 202.9 Nozzle Diameter, inches 0.222 0.222 0.222 0.222 Pitot Tube Coefficient 0.84 0.84 0.84 0.840 Dry Gas Meter Calibration Factor 0.9955 0.9955 0.9955 0.996 Barometric Pressure, inches of Mercury 28.94 28.94 28.94 28.940 Average Orifice Meter Differential, inches H2O 0.46 0.47 0.47 0.467 Dry Gas Meter Volume Sampled, cubic feet 83.310 81.510 83.520 82.780 Average Dry Gas Meter Temperature, °F 80.25 84.64 81.54 82.143 Dry Gas Meter Volume Sampled, dscf 78.491 76.178 78.504 77.724 Total Moisture Liquid collected, g 66 60 77 67.667 Volume of Water Vapor, standard cubic feet 3.11 2.82 3.62 3.183 Moisture Content of Stack Gas, % 3.81 3.57 4.41 3.930 Moisture Saturation at Stack Gas Temperature, % 100.00 100.00 100.00 100.000 Dry Mole Fraction 0.9619 0.9643 0.9559 0.961 Carbon Dioxide, % 5.71 5.8 6.44 5.983 Oxygen, % 14.45 14.3 13.68 14.143 Carbon Monoxide & Nitrogen, % 79.84 79.9 79.88 79.873 Fuel Factor 1.13 1.14 1.12 Dry Molecular Weight, lb/lb-Mole 29.49 29.50 29.58 29.523 Wet Molecular weight, lb/lb-Mole 29.05 29.09 29.07 29.070 Flue Gas Static Pressure, inches of H2O -0.27 -0.27 -0.27 -0.270 Absolute Flue Gas Pressure, inch es of Mercury 28.92 28.92 28.92 28.920 Average Stack Gas Temperature, °F 281.86 285.14 284.19 283.730 Average Velocity Head, inches of H2O 0.3470440073 93757 0.347198593 029155 0.343473204 734951 0.346
Average Stack Gas Velocity, feet/second 39.75 39.82 39.60 39.723 Stack Cross-Sectional Area, square feet 9.393 9.393 9.393 9.393 Dry Volumetric Flow Rate, dry scfm 14,824.2 14,821.8 14,630.2 14,758.733 Actual Wet Volumetric Flue Gas FlowRate, acfm 22,402.3 22,441.8 22,317.8 22,387.300 Percent Isokinetic of Sampling Rate, % 89.5 88.0 92.4 89.967 Percent Excess Air, % 218.0 210.5 184.7 204.400 F-Factor, dscfm/MMBtu @ %O2 0 0 0 0.000 Round Duct Diameter, inches 41.5 41.5 41.5 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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