# APPENDIX IV FIELD DATA SHEETS

# EPA Method 1 Data Sheet

Date 3/12/2013 Project Code nsas00713 Technican GMS

4 Distance from far wall to outside of port 4 Nipple length and/or wall thickness 6.0 Depth of Stack or Duct Stack or Duct width (if rectangular) Distance (in.) Diameters Equivalent Diameter (if rectangular) ~3000 9.0 ~770 3.0

Point Percent Distance from
of Duct Inside

Wall
1 4.4 13.72
2 14.6 45.52
3 29.4 91.67
4
5
6
7
8
9
10
11
12
GEL Engineering, LLC A Member of The GEL Group, Inc. 2040 Savage Road, P.O. Box 30712, Charleston, South Carolina 29407 (843) 769-7378 FAX (843) 769-7397 Distance from
Outside
of Port
21.72
53.52
99.67 Port Inside Diameter 311.8

Nearest Upstream Disturbance (B) Nearest Downstream Disturbance (A) 

# Ports Diameters (in.) Number of Ports Available 319.8 Number of Ports Used 8.0 Plant Century Aluminum City/State Hawesville, Ky Sampling Location Lines 1-4 Stack

2 5 1.25 7 1.75 8

6 1.50

2.00

0.50 

## 24 or 25

20 16 12 12

16 UP DOWN DIAMETERS Velocity Particulate 

## Draw Horizontal Line Through Diameters 

## ROUND STACK OR DUCT 4 6 8 10 12 14 16 18 20 22 24 1 6.7 4.4 3.2 2.6 2.1 1.8 1.5 1.4 1.3 1.1 1.1 2 25.0 14.6 10.5 8.2 6.7 6.7 4.3 4.4 3.9 3.5 3.2 3 75.0 29.4 19.4 14.6 11.5 9.9 8.5 7.5 6.7 6.0 5.5 4 93.3 70.4 32.3 22.6 17.7 14.6 12.5 10.9 9.7 8.7 7.8 5 85.4 67.7 34.2 25.0 20.1 16.9 14.6 12.9 11.6 10.5 6 95.8 80.6 65.8 35.5 26.9 22.0 18.8 16.5 14.5 13.2 7 89.5 77.4 64.4 36.6 28.3 23.6 20.4 18.0 16.1 8 96.4 85.4 75.0 63.4 37.5 29.5 25.0 21.8 19.4 9 91.8 82.3 73.1 62.5 38.2 30.6 26.2 23.0 10 97.4 88.2 78.9 71.7 61.8 38.8 31.5 27.2 11 93.3 85.4 78.0 70.4 61.2 39.3 32.3 12 97.9 90.1 83.1 76.4 69.4 60.7 39.8 13 94.3 87.5 81.2 75.0 68.5 60.2 14 98.3 91.5 85.4 79.6 73.8 67.7 15 95.1 89.1 83.5 78.2 72.8 16 98.4 92.5 87.1 82.0 77.0 17 95.6 90.3 85.4 80.6 18 98.6 93.3 88.4 83.9 19 96.1 91.3 86.8 20 96.7 94.0 89.5 21 96.5 92.1 22 98.9 94.5 23 96.8 24 98.9

SQUARE STACK OR DUCT 2 3 4 5 6 7 8 9 10 11 12 1 25.0 16.7 12.5 10.0 8.3 7.1 6.3 5.6 5.0 4.5 4.2 2 75.0 50.0 37.5 30.0 25.0 21.4 18.8 16.7 15.0 13.6 12.5 3 83.3 62.5 50.0 41.7 35.7 31.3 27.8 25.0 22.7 20.8 4 87.5 70.0 58.3 50.0 43.8 38.9 35.0 31.8 29.2 5 90.0 75.0 64.3 56.3 50.0 45.0 40.9 37.5 6 91.7 78.6 68.5 61.1 55.0 50.0 45.8 7 92.9 81.3 72.2 65.0 59.1 54.2 8 93.8 83.3 75.0 66.2 62.5 9 94.4 85.0 77.3 70.8 10 95.0 86.4 79.2 11 95.5 87.5 12 96.3 

# = + = Width) (Depth (Width) (Depth) 2 D e



## Decimal to Fraction Conversion Table Decimal Fraction Decimal Use These Inches Inches Fraction Range Inches 0.0000-0.0625 0 0.125 1/8 0.0625-0.1874 1/8 0.250 1/4 0.1875-0.3125 1/4 0.375 3/8 0.3125-0.4375 3/8 0.500 1/2 0.4375-0.5625 1/2 0.625 5/8 0.5625-0.6875 5/8 0.750 3/4 0.6875-0.8125 3/4 0.875 7/8 0.8125-0.9375 7/8 0.9375-1.0000 1

# EPA Method 1 Data Sheet

Date 3/12/2013 Project Code nsas00713 Technican GMS

2 Distance from far wall to outside of port 2 Nipple length and/or wall thickness 5.0 Depth of Stack or Duct Stack or Duct width (if rectangular) Distance (in.) Diameters Equivalent Diameter (if rectangular) 64 6.0 38 2.0

Point Percent Distance from
of Duct Inside

Wall
1 4.4 0.62
2 14.6 2.04
3 29.4 4.12
4 70.4 9.86
5 85.4 11.96
6 95.8 13.41
7
8
9
10
11
12
GEL Engineering, LLC A Member of The GEL Group, Inc. 2040 Savage Road, P.O. Box 30712, Charleston, South Carolina 29407 (843) 769-7378 FAX (843) 769-7397 9.86
11.96
13.41 Distance from
Outside
of Port
0.62
2.04
4.12 Port Inside Diameter 14.0

Nearest Upstream Disturbance (B) Nearest Downstream Disturbance (A) 

# Ports Diameters (in.) Number of Ports Available 14.0 Number of Ports Used 0.0 Plant Century Aluminum City/State Hawesville, Ky Sampling Location Line 4 Downcomer

2 5 1.25 7 1.75 8

6 1.50

2.00

0.50 

## 24 or 25

20 16 12 12

16 UP DOWN DIAMETERS Velocity Particulate 

## Draw Horizontal Line Through Diameters 

## ROUND STACK OR DUCT 4 6 8 10 12 14 16 18 20 22 24 1 6.7 4.4 3.2 2.6 2.1 1.8 1.5 1.4 1.3 1.1 1.1 2 25.0 14.6 10.5 8.2 6.7 6.7 4.3 4.4 3.9 3.5 3.2 3 75.0 29.4 19.4 14.6 11.5 9.9 8.5 7.5 6.7 6.0 5.5 4 93.3 70.4 32.3 22.6 17.7 14.6 12.5 10.9 9.7 8.7 7.8 5 85.4 67.7 34.2 25.0 20.1 16.9 14.6 12.9 11.6 10.5 6 95.8 80.6 65.8 35.5 26.9 22.0 18.8 16.5 14.5 13.2 7 89.5 77.4 64.4 36.6 28.3 23.6 20.4 18.0 16.1 8 96.4 85.4 75.0 63.4 37.5 29.5 25.0 21.8 19.4 9 91.8 82.3 73.1 62.5 38.2 30.6 26.2 23.0 10 97.4 88.2 78.9 71.7 61.8 38.8 31.5 27.2 11 93.3 85.4 78.0 70.4 61.2 39.3 32.3 12 97.9 90.1 83.1 76.4 69.4 60.7 39.8 13 94.3 87.5 81.2 75.0 68.5 60.2 14 98.3 91.5 85.4 79.6 73.8 67.7 15 95.1 89.1 83.5 78.2 72.8 16 98.4 92.5 87.1 82.0 77.0 17 95.6 90.3 85.4 80.6 18 98.6 93.3 88.4 83.9 19 96.1 91.3 86.8 20 96.7 94.0 89.5 21 96.5 92.1 22 98.9 94.5 23 96.8 24 98.9

SQUARE STACK OR DUCT 2 3 4 5 6 7 8 9 10 11 12 1 25.0 16.7 12.5 10.0 8.3 7.1 6.3 5.6 5.0 4.5 4.2 2 75.0 50.0 37.5 30.0 25.0 21.4 18.8 16.7 15.0 13.6 12.5 3 83.3 62.5 50.0 41.7 35.7 31.3 27.8 25.0 22.7 20.8 4 87.5 70.0 58.3 50.0 43.8 38.9 35.0 31.8 29.2 5 90.0 75.0 64.3 56.3 50.0 45.0 40.9 37.5 6 91.7 78.6 68.5 61.1 55.0 50.0 45.8 7 92.9 81.3 72.2 65.0 59.1 54.2 8 93.8 83.3 75.0 66.2 62.5 9 94.4 85.0 77.3 70.8 10 95.0 86.4 79.2 11 95.5 87.5 12 96.3 

# = + = Width) (Depth (Width) (Depth) 2 D e



## Decimal to Fraction Conversion Table Decimal Fraction Decimal Use These Inches Inches Fraction Range Inches 0.0000-0.0625 0 0.125 1/8 0.0625-0.1874 1/8 0.250 1/4 0.1875-0.3125 1/4 0.375 3/8 0.3125-0.4375 3/8 0.500 1/2 0.4375-0.5625 1/2 0.625 5/8 0.5625-0.6875 5/8 0.750 3/4 0.6875-0.8125 3/4 0.875 7/8 0.8125-0.9375 7/8 0.9375-1.0000 1Plant:

Method: 29 Checks Pre Mid Post Testing Operator: 13 10 Job Number: 0.003 0.002 Calibration Yes Yes 1.0102 Yes Yes 1.8903 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.9 52 Filters -0.32 Concentrations 20.9 0 11.200

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 19:00 339.221 0.04 1.5 1.5 52 250 255 250 45 55 56 1 A2 20 40 19:20 352 0.045 1.71 1.71 52 250 255 250 45 60 57 1 A3 40 60 19:40 365.9 0.04 1.53 1.53 52 250 255 250 45 65 58 2 A4 60 80 20:00 379.2 0.04 1.54 1.54 52 250 255 250 47 68 58 2 A5 80 100 20:20 392.6 0.045 1.74 1.74 52 250 255 250 47 70 60 2 A6 100 120 20:40 406.8 0.045 1.74 1.74 52 250 255 250 48 71 62 2 B1 120 140 21:00 421 0.045 1.74 1.74 54 250 255 250 48 72 63 2 B2 140 160 21:20 435.4 0.045 1.74 1.74 54 250 255 250 48 72 64 2 B3 160 180 21:40 449.6 0.045 1.74 1.74 54 250 255 250 48 72 64 2 B4 180 200 22:00 463.6 0.045 1.74 1.74 52 250 255 250 49 71 64 2 B5 200 220 22:20 477.6 0.04 1.55 1.55 51 250 255 250 49 71 65 2 B6 22:30 485.213 #4 Dowcomer
Leak Check Total Volume (ft3):

3/12/2013
Pitot (Yes/No): Run Date: NSAS

Meter Box Correction Factor, Y: Meter Box pressure differential, Δ H@ (in H 2O):

CO 2Concentration: Nozzle diameter, Dn (in):

Pg (in. H2O):

O 2Concentration: 13Q-83 na 3 0.43

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) Vacuum (in Hg):
Leak Rate (cfm): Equipment Identification Sampling Location:

Clock Time 24 hr Velocity Head (**∆** P in H2O) Nozzle (Yes/No): Stack Thermocouple (Yes/No):

Pbar (in. Hg): Orsat Pump: Probe Length/Type: Tedlar Bags: Century Aluminum

1 GMS

Unbilical Line: MB-7 na

Impinger 3: Impinger 4: Sensitivity (in. H2O)

Silica Gel.: Filter No. 1: Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp: na na

Sample Rate Filter Temperature °F Impinger 2:

Impinger 5: Impinger 6:

Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Traverse Point No. Sampling Time

(min) Filter No. 3: Filter No. 2: Micro-manometer Used?

Nozzle ID: Temperature: Impinger 1:

Impinger Water Weight, Vlc:Plant:

Method: 29 Checks Pre Mid Post Testing Operator: 14 12 Job Number: 0.007 0.005 Calibration Yes Yes 1.0102 Yes Yes 1.8903 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.9 49 Filters -0.32 Concentrations 20.9 0 10.900

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 22:50 485.89 0.045 1.72 1.72 50 251 255 252 51 61 61 1 A2 20 40 23:10 499.7 0.04 1.54 1.54 48 251 255 252 47 65 61 2 A3 40 60 23:30 513 0.04 1.54 1.54 50 251 255 252 47 67 61 2 A4 60 80 23:50 526.3 0.04 1.55 1.55 50 251 255 252 47 68 61 2 A5 80 100 0:10 539.7 0.04 1.54 1.54 51 251 255 252 47 68 61 2 A6 100 120 0:30 553 0.04 1.55 1.55 50 251 255 252 46 69 61 2 B1 120 140 0:50 566.6 0.04 1.55 1.55 50 251 255 252 46 69 61 2 B2 140 160 1:10 580 0.045 1.74 1.74 50 251 255 252 47 69 61 2 B3 160 180 1:30 594.1 0.045 1.74 1.74 50 251 255 252 46 68 62 2 B4 180 200 1:50 608.3 0.045 1.75 1.75 49 251 255 252 46 69 62 2 B5 200 220 2:10 622.6 0.045 1.74 1.74 50 251 255 252 46 69 62 2 B6 2:20 630.062 Leak Rate (cfm):

Century Aluminum Sampling Location: #4 Dowcomer Run No.: 2 GMS Vacuum (in Hg):

Pitot (Yes/No): Run Date: 3/12/2013 NSAS

Reagent Box: MB-7 Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3):

Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: na Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: na Pitot tube coefficient, Cp: Unbilical Line: na Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: na Probe Length/Type: 3 Impinger 1: Nozzle ID: 0.43

Filter No. 2: O 2Concentration: Impinger 6: Filter No. 1: 13Q-86 Impinger 5: Temperature: Impinger 3:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: CO 2Concentration: Silica Gel.:

Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °FPlant:

Method: 29 Checks Pre Mid Post Testing Operator: 12 6 Job Number: 0.008 0.005 Calibration Yes Yes 1.0102 Yes Yes 1.8903 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.9 45 Filters -0.32 Concentrations 20.9 0 12.100

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 2:40 630.472 0.045 1.72 1.72 47 253 255 252 45 59 59 1 A2 20 40 3:00 644.3 0.045 1.73 1.73 47 253 255 252 45 62 59 2 A3 40 60 3:20 658.3 0.045 1.74 1.74 47 253 255 252 45 64 59 2 A4 60 80 3:40 672.5 0.045 1.74 1.74 47 253 255 252 45 66 59 2 A5 80 100 4:00 686.7 0.045 1.75 1.75 45 253 255 252 46 65 59 2 A6 100 120 4:20 700.7 0.045 1.75 1.75 43 253 255 252 47 65 59 2 B1 120 140 4:40 715 0.045 1.75 1.75 42 253 255 252 47 63 57 2 B2 140 160 5:00 729.1 0.045 1.75 1.75 41 253 255 252 47 62 56 2 B3 160 180 5:20 743.2 0.04 1.56 1.56 41 253 255 252 47 62 55 2 B4 180 200 5:40 756.7 0.04 1.56 1.56 41 253 255 252 47 62 55 2 B5 200 220 6:00 770.1 0.045 1.75 1.75 41 253 255 252 47 62 55 2 B6 6:10 777.524 Leak Rate (cfm):

Century Aluminum Sampling Location: #4 Dowcomer Run No.: 3 GMS Vacuum (in Hg):

Pitot (Yes/No): Run Date: 3/13/2013 NSAS

Reagent Box: MB-7 Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3):

Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: na Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: na Pitot tube coefficient, Cp: Unbilical Line: na Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: na Probe Length/Type: 3 Impinger 1: Nozzle ID: 0.43

Filter No. 2: O 2Concentration: Impinger 6: Filter No. 1: 13Q-87 Impinger 5: Temperature: Impinger 3:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: CO 2Concentration: Silica Gel.:

Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °FPlant:

Method: 315 Checks Pre Mid Post Testing Operator: 12 11 Job Number: 0.006 0.005 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.9 52 Filters -0.32 Concentrations 20.9 0 8.000

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 19:00 32.034 0.04 1.42 1.42 52 252 255 252 46 53 52 1 A2 15 30 19:15 42.1 0.045 1.62 1.62 52 252 255 252 45 60 56 1 A3 30 45 19:30 52.6 0.04 1.45 1.45 52 252 255 252 45 62 58 1 A4 45 60 19:45 62.4 0.045 1.64 1.64 52 252 255 252 45 65 59 1 A5 60 75 20:00 73.1 0.045 1.65 1.65 52 252 255 252 46 68 61 1 A6 75 90 20:15 83.7 0.045 1.66 1.66 52 252 255 252 47 71 64 1 B1 90 105 20:30 94.5 0.045 1.66 1.66 53 252 255 252 47 72 65 1 B2 105 120 20:45 105.4 0.045 1.66 1.66 53 252 255 252 48 72 65 1 B3 120 135 21:00 116 0.045 1.65 1.65 54 252 255 252 49 72 66 1 B4 135 150 21:15 126.6 0.045 1.65 1.65 54 252 255 252 50 72 66 1 B5 21:30 139.297 B6 Impinger Water Weight, Vlc: Tedlar Bags:

Traverse Point No. Sampling Time

(min) Filter No. 3: Filter No. 2:

Sample Rate Filter Temperature °F Impinger 2:

Impinger 5: Impinger 6:

Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Sensitivity (in. H2O)

Silica Gel.: Filter No. 1: Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp: na na Micro-manometer Used?

Nozzle ID: Century Aluminum

1 GMS

Unbilical Line: MB-5 na Sampling Location:

Meter Box Correction Factor, Y: Meter Box pressure differential, Δ H@ (in H 2O): Leak Check Total Volume (ft3):

Nozzle (Yes/No): Stack Thermocouple (Yes/No):

Pbar (in. Hg):

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) Temperature: Impinger 3: Impinger 4: Impinger 1: na 2 0.43

Clock Time 24 hr Velocity Head (**∆** P in H2O) CO 2Concentration: Nozzle diameter, Dn (in):

Pg (in. H2O):

O 2Concentration: #4 Dowcomer

3/12/2013

Orsat Pump: Probe Length/Type:

13Q-90 Pitot (Yes/No): Run Date: NSAS Vacuum (in Hg):
Leak Rate (cfm): Equipment IdentificationPlant:

Method: 315 Checks Pre Mid Post Testing Operator: 11 10 Job Number: 0.006 0.004 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.9 49 Filters -0.32 Concentrations 20.9 0 7.700

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 21:50 140.144 0.045 1.63 1.63 51 253 254 251 50 63 63 1 A2 15 30 22:05 150.6 0.045 1.65 1.65 51 253 254 251 48 67 64 1 A3 30 45 22:20 161.1 0.045 1.65 1.65 51 253 254 251 48 68 64 1 A4 45 60 22:35 171.9 0.045 1.65 1.65 50 253 254 251 47 68 64 1 A5 60 75 22:50 182.5 0.045 1.65 1.65 50 253 254 251 47 68 64 1 A6 75 90 23:05 193.1 0.04 1.48 1.48 48 253 254 251 46 68 63 1 B1 90 105 23:20 203.2 0.04 1.48 1.48 48 253 254 251 46 69 63 1 B2 105 120 23:35 213.6 0.04 1.48 1.48 49 253 254 251 46 70 63 1 B3 120 135 23:50 223.7 0.04 1.48 1.48 50 253 254 251 46 71 63 1 B4 135 150 0:05 233.8 0.04 1.47 1.47 51 253 254 251 46 70 63 1 B5 0:24 246.376 B6 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) 0.43

Filter No. 2: O 2Concentration: Impinger 6: Filter No. 1: 13Q-89 Impinger 5: Temperature: Impinger 3: na Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: na Probe Length/Type: 2 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: na Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: na Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 3/12/2013 NSAS

Reagent Box: MB-5 Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: #4 Dowcomer Run No.: 2 GMS Vacuum (in Hg):Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 9 10 Job Number: 0.004 0.005 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.9 49 Filters -0.32 Concentrations 20.9 0 6.700

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 0:45 248.288 0.04 1.45 1.45 49 253 254 251 47 60 61 1 A2 15 30 1:00 258 0.045 1.63 1.63 50 253 254 251 45 61 61 1 A3 30 45 1:15 268.6 0.045 1.64 1.64 50 253 254 251 46 63 61 1 A4 45 60 1:30 279.2 0.045 1.65 1.65 49 253 254 251 46 65 61 1 A5 60 75 1:45 289.7 0.045 1.65 1.65 49 253 254 251 46 66 61 1 A6 75 90 2:00 300.5 0.045 1.65 1.65 49 253 254 251 46 67 61 1 B1 90 105 2:15 311 0.045 1.65 1.65 49 253 254 251 46 67 61 1 B2 105 120 2:30 321.6 0.045 1.66 1.66 48 253 254 251 46 67 61 1 B3 120 135 2:45 332.6 0.045 1.66 1.66 47 253 254 251 46 67 62 1 B4 135 150 3:00 343.2 0.045 1.66 1.66 47 253 254 251 46 67 62 1 B5 3:15 355.441 B6 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) 0.43

Filter No. 2: O 2Concentration: Impinger 6: Filter No. 1: 13Q-88 Impinger 5: Temperature: Impinger 3: na Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: na Probe Length/Type: 2 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: na Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: na Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 3/13/2013 NSAS

Reagent Box: MB-5 Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: #4 Dowcomer Run No.: 3 GMS Vacuum (in Hg):Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 13 10 Job Number: 0.007 0.005 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.85 37 Filters -0.3 Concentrations 20.9 0 6.500

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 19:15 355.971 0.045 1.59 1.59 39 251 254 252 34 37 37 1 A2 15 30 19:30 366 0.045 1.6 1.6 38 251 254 252 35 40 39 1 A3 30 45 19:45 376.1 0.045 1.62 1.62 37 251 254 252 35 43 40 1 A4 45 60 20:00 386.5 0.045 1.62 1.62 37 251 254 252 36 45 42 1 A5 60 75 20:15 396.8 0.045 1.64 1.64 37 251 254 252 36 49 43 1 A6 75 90 20:30 407.1 0.045 1.64 1.64 37 251 254 252 36 50 44 1 B1 90 105 20:45 417.7 0.045 1.64 1.64 37 251 254 252 36 51 45 1 B2 105 120 21:00 428.4 0.05 1.83 1.83 37 251 254 252 37 53 46 1 B3 120 135 21:15 439.7 0.05 1.84 1.84 37 251 254 252 38 55 47 1 B4 135 150 21:30 451.3 0.045 1.63 1.63 37 251 254 252 38 56 47 1 B5 21:45 462.362 B6 Traverse Point No. Sampling Time

(min) Filter No. 3: Filter No. 2: Micro-manometer Used?

Nozzle ID: Temperature: Impinger 1:

Impinger Water Weight, Vlc: Impinger 3:

Sample Rate Filter Temperature °F Impinger 2:

Impinger 5: Impinger 6:

Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Sensitivity (in. H2O)

Silica Gel.: Filter No. 1: Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp: na na Tedlar Bags: Century Aluminum

4 GMS

Unbilical Line: MB-5 na Sampling Location:

Meter Box Correction Factor, Y: Meter Box pressure differential, Δ H@ (in H 2O): Leak Check Total Volume (ft3):

Nozzle (Yes/No): Stack Thermocouple (Yes/No):

Pbar (in. Hg):

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) Impinger 4: na 2 0.43

Clock Time 24 hr Velocity Head (**∆** P in H2O) CO 2Concentration: Nozzle diameter, Dn (in):

Pg (in. H2O):

O 2Concentration: #4 Dowcomer-B

3/13/2013

Orsat Pump: Probe Length/Type:

13Q-91 Pitot (Yes/No): Run Date: NSAS Vacuum (in Hg):
Leak Rate (cfm): Equipment IdentificationPlant:

Method: 315 Checks Pre Mid Post Testing Operator: 14 8 Job Number: 0.009 0.005 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.85 36 Filters -0.3 Concentrations 20.9 0 6.800

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 22:00 463.58 0.045 1.65 1.65 35 254 255 253 38 50 50 1 A2 15 30 22:15 474.1 0.045 1.65 1.65 37 254 255 253 39 52 51 1 A3 30 45 22:30 484.3 0.04 1.47 1.47 37 254 255 253 39 54 51 1 A4 45 60 22:45 494.6 0.045 1.66 1.66 37 254 255 253 39 55 51 1 A5 60 75 23:00 505.2 0.045 1.66 1.66 36 254 255 253 40 56 52 1 A6 75 90 23:15 515.8 0.04 1.48 1.48 36 254 255 253 41 58 52 1 B1 90 105 23:30 525.8 0.04 1.48 1.48 36 254 255 253 42 58 52 1 B2 105 120 23:45 535.9 0.04 1.48 1.48 38 254 255 253 43 58 53 1 B3 120 135 0:00 545.9 0.04 1.47 1.47 39 254 255 253 43 58 53 1 B4 135 150 0:15 555.7 0.045 1.66 1.66 39 254 255 253 43 58 53 1 B5 0:30 566.967 B6 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) 0.43

Filter No. 2: O 2Concentration: Impinger 6: Filter No. 1: 13Q-92 Impinger 5: Temperature: Impinger 3: na Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: na Probe Length/Type: 2 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: na Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: na Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 3/13/2013 NSAS

Reagent Box: MB-5 Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: #4 Dowcomer-B Run No.: 5 GMS Vacuum (in Hg):Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 12 11 Job Number: 0.005 0.005 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.43 Moisture in: ml H2O Initial Final Yes Ambient Conditions 29.85 36 Filters -0.3 Concentrations 20.9 0 7.200

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 0:45 567.442 0.04 1.45 1.45 39 253 253 250 39 51 51 1 A2 15 30 1:00 577.4 0.04 1.46 1.46 39 253 253 250 39 53 51 1 A3 30 45 1:15 587.3 0.04 1.47 1.47 39 253 253 250 38 55 52 1 A4 45 60 1:30 597.3 0.045 1.65 1.65 39 253 253 250 37 57 52 1 A5 60 75 1:45 607.9 0.045 1.66 1.66 38 253 253 250 37 58 53 1 A6 75 90 2:00 618.6 0.045 1.66 1.66 38 253 253 250 37 59 53 1 B1 90 105 2:15 629.2 0.045 1.66 1.66 38 253 253 250 37 59 53 1 B2 105 120 2:30 639.8 0.045 1.67 1.67 37 253 253 250 38 59 53 1 B3 120 135 2:45 650.5 0.045 1.67 1.67 37 253 253 250 38 60 53 1 B4 135 150 3:00 661.1 0.045 1.67 1.67 37 253 253 250 38 60 53 1 B5 3:15 671.829 B6 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) 0.43

Filter No. 2: O 2Concentration: Impinger 6: Filter No. 1: 13Q-93 Impinger 5: Temperature: Impinger 3: na Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: na Probe Length/Type: 2 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: na Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: na Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 3/14/2013 NSAS

Reagent Box: MB-5 Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: #4 Dowcomer-B Run No.: 6 GMS Vacuum (in Hg):Plant:

Method: 17 Checks Pre Mid Post Testing Operator: 13 8 Job Number: 0.004 0.005 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.39 Moisture in: ml H2O Initial Final Yes Ambient Conditions 251.4 276.2 29.77 81 Filters -0.04 Concentrations 20.9 0 258.2 286.8 53.400

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 17:30 386.998 0.07 1.65 1.65 89 0 0 0 59 77 77 2 A2 20 40 17:50 401.1 0.07 1.65 1.65 91 0 0 0 52 82 78 2 A3 40 60 18:10 415.9 0.07 1.66 1.66 91 0 0 0 54 85 80 2 A4 60 80 18:30 430.7 0.06 1.46 1.46 79 0 0 0 54 87 82 2 A5 80 100 18:50 444.2 0.07 1.72 1.72 77 0 0 0 56 89 84 2 A6 100 120 19:10 459.3 0.06 1.46 1.46 82 0 0 0 57 90 87 2 B1 120 140 19:30 472.8 0.06 1.47 1.47 82 0 0 0 56 91 86 2 B2 140 160 19:50 486.7 0.06 1.47 1.47 80 0 0 0 55 92 87 2 B3 160 180 20:10 500.5 0.06 1.47 1.47 81 0 0 0 55 91 89 2 B4 180 200 20:30 514.4 0.07 1.72 1.72 80 0 0 0 52 91 87 2 B5 200 220 20:50 523.3 0.07 1.71 1.71 80 0 0 0 51 90 87 2 B6 220 240 21:10 544.2 0.06 1.47 1.47 79 0 0 0 51 89 86 2 557.946 Traverse Point No. Sampling Time

(min) Filter No. 3: Filter No. 2: Micro-manometer Used?

Nozzle ID: Temperature: Impinger 1:

Impinger Water Weight, Vlc: Impinger 3:

Sample Rate Filter Temperature °F Impinger 2:

Impinger 5: Impinger 6:

Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Sensitivity (in. H2O)

Silica Gel.: Filter No. 1: Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp: #112 N/A Tedlar Bags: Century Aluminum

1 SAH

Unbilical Line: N/A N/A Sampling Location:

Meter Box Correction Factor, Y: Meter Box pressure differential, Δ H@ (in H 2O): Leak Check Total Volume (ft3):

Nozzle (Yes/No): Stack Thermocouple (Yes/No):

N/A Pbar (in. Hg):

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) N/A Impinger 4: N/A 4 N/A

Clock Time 24 hr Velocity Head (**∆** P in H2O) CO 2Concentration: Nozzle diameter, Dn (in):

Pg (in. H2O):

O 2Concentration: Line #4 Dowcomer

5/7/2013

Orsat Pump: Probe Length/Type:

S-142 Pitot (Yes/No): Run Date: nsas00713 Vacuum (in Hg):
Leak Rate (cfm): Equipment IdentificationPlant:

Method: 17 Checks Pre Mid Post Testing Operator: 14 11 Job Number: 0.002 0.002 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.39 Moisture in: ml H2O Initial Final Yes Ambient Conditions 253 276.4 29.73 76 Filters -0.04 Concentrations 20.9 0 263.4 289.9 49.900

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 21:45 559.254 0.06 1.46 1.46 77 0 0 0 59 84 83 2 A2 20 40 22:05 573 0.06 1.46 1.46 77 0 0 0 61 83 81 2 A3 40 60 22:25 586.7 0.07 1.7 1.7 76 0 0 0 54 83 81 2 A4 60 80 22:45 601.4 0.06 1.46 1.46 76 0 0 0 52 84 81 2 A5 80 100 23:05 615.1 0.07 1.7 1.7 77 0 0 0 51 83 81 2 A6 100 120 23:25 629.7 0.06 1.46 1.46 76 0 0 0 51 83 81 2 B1 120 140 23:45 643.7 0.07 1.71 1.71 75 0 0 0 51 83 79 2 B2 140 160 0:05:00 658.3 0.06 1.47 1.47 74 0 0 0 51 84 80 2 B3 160 180 0:25:00 672.2 0.06 1.47 1.47 72 0 0 0 52 84 80 2 B4 180 200 0:45:00 685.8 0.06 1.47 1.47 73 0 0 0 53 83 80 2 B5 200 220 1:05 699.4 0.07 1.72 1.72 71 0 0 0 53 83 80 2 B6 220 240 1:25 714 0.05 1.23 1.23 72 0 0 0 54 83 79 2 726.878 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: N/A CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) N/A

Filter No. 2: N/A O 2Concentration: Impinger 6: Filter No. 1: S-141 Impinger 5: Temperature: Impinger 3: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: N/A Probe Length/Type: 4 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: #112 Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 5/7/2013 nsas00713

Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: Line #4 Dowcomer Run No.: 2 SAH Vacuum (in Hg):Plant:

Method: 17 Checks Pre Mid Post Testing Operator: 13 9 Job Number: 0.005 0.003 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.39 Moisture in: ml H2O Initial Final Yes Ambient Conditions 264 288.7 29.76 69 Filters -0.04 Concentrations 20.9 0 268 298.8 55.500

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 2:00 727.41 0.06 1.48 1.48 68 0 0 0 52 81 78 2 A2 20 40 2:20 741.2 0.07 1.72 1.72 68 0 0 0 53 79 76 2 A3 40 60 2:40 755.8 0.07 1.71 1.71 70 0 0 0 53 80 76 2 A4 60 80 3:00 770.7 0.06 1.47 1.47 70 0 0 0 53 81 77 2 A5 80 100 3:20 784.4 0.07 1.72 1.72 70 0 0 0 48 81 77 2 A6 100 120 3:40 799.3 0.06 1.47 1.47 70 0 0 0 49 81 77 2 B1 120 140 4:00 812.8 0.06 1.47 1.47 70 0 0 0 42 82 78 2 B2 140 160 4:20 826.8 0.06 1.47 1.47 70 0 0 0 43 82 78 2 B3 160 180 4:40 840.6 0.07 1.72 1.72 71 0 0 0 45 82 77 3 B4 180 200 5:00 855.3 0.06 1.47 1.47 70 0 0 0 46 82 77 3 B5 200 220 5:20 868.8 0.07 1.72 1.72 70 0 0 0 47 82 78 4 B6 220 240 5:40 883.6 0.06 1.48 1.48 68 0 0 0 49 82 78 4 897.268 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: N/A CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) N/A

Filter No. 2: N/A O 2Concentration: Impinger 6: Filter No. 1: S-140 Impinger 5: Temperature: Impinger 3: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: N/A Probe Length/Type: 4 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: #112 Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 5/8/2013 nsas00713

Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: Line #4 Dowcomer Run No.: 3 SAH Vacuum (in Hg):Plant:

Method: 17 Checks Pre Mid Post Testing Operator: 12 11 Job Number: 0.006 0.009 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.39 Moisture in: ml H2O Initial Final Yes Ambient Conditions 253.4 271.9 29.79 81 Filters -0.04 Concentrations 20.9 0 242.1 265 41.400

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 16:45 914.63 0.06 1.4 1.4 96 N/A 81 82 2 A2 20 40 17:05 927.9 0.07 1.65 1.65 94 N/A 83 83 2 A3 40 60 17:25 942.4 0.06 1.42 1.42 97 N/A 89 87 2 A4 60 80 17:45 955.9 0.06 1.43 1.43 96 N/A 92 90 2 A5 80 100 18:05 969.5 0.07 1.67 1.67 97 N/A 92 89 2 A6 100 120 18:25 984.1 0.06 1.44 1.44 95 N/A 93 90 2 B1 120 140 18:45 997.9 0.06 1.44 1.44 93 N/A 93 90 2 B2 140 160 19:05 1011.5 0.07 1.69 1.69 90 N/A 92 89 2 B3 160 180 19:25 1026.4 0.06 1.46 1.46 87 N/A 92 89 2 B4 180 200 19:45 1040.1 0.06 1.46 1.46 85 N/A 90 88 2 B5 200 220 20:05 1053.6 0.07 1.7 1.7 84 N/A 90 88 2 B6 220 240 20:25 1068.2 0.07 1.7 1.7 83 N/A 89 87 2 1083.812 Traverse Point No. Sampling Time

(min) Filter No. 3: Micro-manometer Used?

Nozzle ID: Temperature:

Filter No. 2: Impinger 1:

Impinger Water Weight, Vlc: Impinger 3:

Sample Rate Filter Temperature °F Impinger 2:

Impinger 5: Impinger 6:

Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Sensitivity (in. H2O)

Silica Gel.: Filter No. 1: Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp: #112 N/A Tedlar Bags: CenturyAluminum

4 CER

Unbilical Line: N/A N/A Sampling Location:

Meter Box Correction Factor, Y: Meter Box pressure differential, Δ H@ (in H 2O): Leak Check Total Volume (ft3):

Nozzle (Yes/No): Stack Thermocouple (Yes/No):

N/A Pbar (in. Hg):

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) N/A Impinger 4: N/A 4 N/A

Clock Time 24 hr Velocity Head (**∆** P in H2O) CO 2Concentration: Nozzle diameter, Dn (in):

Pg (in. H2O):

O 2Concentration: Line #4 Dowcomer

5/8/2013

Orsat Pump: Probe Length/Type:

S-143 Pitot (Yes/No): Run Date: NSAS00713 Vacuum (in Hg):
Leak Rate (cfm): Equipment IdentificationPlant:

Method: 17 Checks Pre Mid Post Testing Operator: 10 10 Job Number: 0.004 0.002 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.39 Moisture in: ml H2O Initial Final Yes Ambient Conditions 274.5 294.3 29.62

Filters -0.04 Concentrations 20.9 0 286.3 307.2 40.700

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 21:00 84.221 0.06 1.46 1.46 82 N/A 87 86 2 A2 20 40 21:20 97.8 0.06 1.46 1.46 82 N/A 89 87 2 A3 40 60 21:40 111.6 0.07 1.71 1.71 81 N/A 91 90 2 A4 60 80 22:00 126.5 0.06 1.47 1.47 81 N/A 92 90 2 A5 80 100 22:20 140.3 0.06 1.48 1.48 79 N/A 92 90 2 A6 100 120 22:40 154.1 0.06 1.48 1.48 79 N/A 92 90 2 B1 120 140 23:00 167.9 0.07 1.73 1.73 76 N/A 92 89 2 B2 140 160 23:20 183.1 0.06 1.48 1.48 77 N/A 92 90 2 B3 160 180 23:40 196.8 0.06 1.49 1.49 75 N/A 92 90 2 B4 180 200 0:00:00 210.5 0.06 1.48 1.48 77 N/A 91 90 2 B5 200 220 0:20 224.6 0.06 1.49 1.49 75 N/A 91 89 2 B6 220 240 0:40 238.7 0.06 1.49 1.49 73 N/A 90 89 2 253.315 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: N/A CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) N/A

Filter No. 2: N/A O 2Concentration: Impinger 6: Filter No. 1: S-144 Impinger 5: Temperature: Impinger 3: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: N/A Probe Length/Type: 4 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: #112 Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 5/8/2013 NSAS00713

Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): CenturyAluminum Sampling Location: Line #4 Dowcomer Run No.: 5 CER Vacuum (in Hg):Plant:

Method: 17 Checks Pre Mid Post Testing Operator: 13 8 Job Number: 0.002 0.005 Calibration Yes Yes 1.0062 Yes Yes 1.797 Yes Yes 0.84 0.39 Moisture in: ml H2O Initial Final Yes Ambient Conditions 255.7 279.2 29.62

Filters -0.04 Concentrations 20.9 0 291.2 312.8 45.100

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 1:15 255.955 0.07 1.71 1.71 74 N/A 83 81 2 A2 20 40 1:35 270.7 0.06 1.47 1.47 73 N/A 85 83 2 A3 40 60 1:55 284.4 0.07 1.73 1.73 72 N/A 88 85 2 A4 60 80 2:05 299.3 0.06 1.49 1.49 72 N/A 88 86 2 A5 80 100 2:15 313.2 0.06 1.49 1.49 71 N/A 88 86 2 A6 100 120 2:35 327.1 0.06 1.49 1.49 71 N/A 88 87 2 B1 120 140 2:55 341.1 0.07 1.73 1.73 72 N/A 88 87 2 B2 140 160 3:15 356.1 0.06 1.49 1.49 72 N/A 89 87 2 B3 160 180 3:35 369.9 0.06 1.48 1.48 73 N/A 88 87 2 B4 180 200 3:55 383.7 0.07 1.73 1.73 72 N/A 88 86 2 B5 200 220 4:15 398.5 0.06 1.49 1.49 71 N/A 87 86 2 B6 220 240 4:35 412.1 0.06 1.49 1.49 71 N/A 87 86 2 427.235 Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Final exit Temperature °F Velocity Head (**∆** P in H2O) Pg (in. H2O): Impinger 4:

Filter No. 3: N/A CO 2Concentration: Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) N/A

Filter No. 2: N/A O 2Concentration: Impinger 6: Filter No. 1: S-145 Impinger 5: Temperature: Impinger 3: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: N/A Probe Length/Type: 4 Impinger 1: Nozzle ID: Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: #112 Pitot tube coefficient, Cp: Unbilical Line: Pitot (Yes/No): Run Date: 5/9/2013 NSAS00713

Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): CenturyAluminum Sampling Location: Line #4 Dowcomer Run No.: 6 CER Vacuum (in Hg):Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 11 12 Job Number: 0.011 0.015 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 266.6 326.3 29.65 27 Filters 0.56 Concentrations N/A N/A 292.8 309.8 76.700

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 9:05 101.465 0.73 1.95 1.95 73 248 250 250 30 37 37 3 A2 15 30 9:20 112.8 0.62 1.66 1.66 73 247 249 249 31 39 39 3 A3 30 45 9:35 123.3 0.46 1.24 1.24 73 249 252 252 33 44 44 3 B1 45 60 9:50 132.4 0.68 1.84 1.84 74 249 251 251 34 45 45 3 B2 60 75 10:05 143.2 0.64 1.73 1.73 74 248 252 252 35 45 45 3 B3 75 90 10:20 154.1 0.55 1.52 1.52 74 247 251 251 35 46 46 3 C1 90 105 10:35 234.3 0.75 1.99 1.99 74 248 251 251 36 46 46 3 C2 105 120 10:50 165.5 0.7 1.86 1.86 74 249 250 250 37 46 46 4 C3 120 135 11:05 176.4 0.68 1.81 1.81 74 248 250 251 37 47 47 4 D1 135 150 11:20 187.2 0.69 1.88 1.88 74 249 251 252 37 48 47 4 D2 150 165 11:35 198.4 0.64 1.74 1.74 74 250 251 250 38 48 47 3 D3 165 180 11:50 208.9 0.63 1.72 1.72 74 249 250 249 37 49 48 3 12:05 219.894 Equipment Identification Leak Check Total Volume (ft3): 3/13/2013

Filter No. 1: N/A Meter Box pressure differential, Δ H@ (in H 2O):

CO 2Concentration: Nozzle diameter, Dn (in): Sampling Location:

O 2Concentration: Run Date: nsas

Meter Box Correction Factor, Y:

Impinger 3: Impinger 4:

Silica Gel.:

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) Vacuum (in Hg):
Leak Rate (cfm): Pitot (Yes/No): Nozzle (Yes/No): Stack Thermocouple (Yes/No): Line 4 Main Stack

Sensitivity (in. H2O)

Clock Time 24 hr Velocity Head (**∆** P in H2O) N/A Pbar (in. Hg): Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp:

Century Aluminum

1 SAH/CER

Unbilical Line: N/A N/A

Pg (in. H2O):

Traverse Point No. Sampling Time

(min) Filter No. 3: N/A Orsat Pump: Probe Length/Type: Tedlar Bags: N/A

Sample Rate Filter Temperature °F Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Impinger Water Weight, Vlc: Micro-manometer Used?

Nozzle ID: Temperature:

Filter No. 2: Impinger 1:

N/A Impinger 2:

Impinger 5: Impinger 6:Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 11 9 Job Number: 0.008 0.007 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 259.5 314.1 29.61 29 Filters 0.56 Concentrations N/A N/A 289.6 306.5 71.500

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 12:20 264.406 0.65 1.73 1.73 75 249 246 246 37 39 39 3 A2 15 30 12:35 275.2 0.63 1.69 1.69 75 248 247 247 36 43 43 3 A3 30 45 12:50 285.4 0.57 1.55 1.55 74 251 247 247 38 47 47 3 B1 45 60 13:05 295.7 0.72 1.96 1.96 74 250 249 249 40 49 49 4 B2 60 75 13:20 307.3 0.63 1.72 1.72 74 250 248 248 41 51 51 4 B3 75 90 13:35 318.8 0.54 1.48 1.48 75 250 249 249 40 52 52 4 C1 90 105 13:50 328.1 0.74 2.03 2.03 75 251 249 249 41 54 54 4 C2 105 120 14:05 339.6 0.61 1.68 1.68 75 250 251 251 42 55 55 4 C3 120 135 14:20 350.2 0.63 1.74 1.74 75 250 250 248 42 56 55 4 D1 135 150 14:35 361 0.69 1.91 1.91 76 251 252 252 42 58 55 4 D2 150 165 14:50 372.5 0.66 1.83 1.83 76 249 251 251 44 59 56 4 D3 165 180 15:05 383.5 0.65 1.81 1.81 75 249 252 251 45 60 57 4 15:20 394.631 3/13/2013 nsas Leak Rate (cfm): Century Aluminum Sampling Location: Line 4 Main Stack Run No.: 2 SAH/CER Vacuum (in Hg):

Nozzle (Yes/No): Leak Check Total Volume (ft3):

Sensitivity (in. H2O) Micro-manometer Used? Pitot (Yes/No): Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Run Date:

Tedlar Bags: N/A Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: Pitot tube coefficient, Cp: Unbilical Line: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: N/A Probe Length/Type: Impinger 1: Nozzle ID: N/A Temperature: Impinger 3:

Filter No. 2: N/A O 2Concentration: Impinger 6: Pg (in. H2O): Impinger 4: Filter No. 1:

Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) Final exit Temperature °F Impinger 5:

Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Velocity Head (**∆** P in H2O) Filter No. 3: N/A CO 2Concentration:Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 13 10 Job Number: 0.006 0.009 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 267 329.4 29.65 31 Filters 0.53 Concentrations N/A N/A 301.3 322.4 83.500

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 15:35 398.294 0.71 1.9 1.9 76 249 247 250 35 41 41 3 A2 15 30 15:50 409.5 0.57 1.54 1.54 75 250 249 250 37 47 47 3 A3 30 45 16:05 419.8 0.44 1.2 1.2 75 253 248 250 38 49 49 3 B1 45 60 16:20 428.6 0.65 1.77 1.77 75 252 248 250 38 49 49 4 B2 60 75 16:35 439.5 0.61 1.66 1.66 75 252 250 250 38 50 50 4 B3 75 90 16:50 449.9 0.58 1.58 1.58 74 252 252 250 38 50 50 4 C1 90 105 17:05 460.3 0.72 1.97 1.97 74 251 251 250 39 50 50 4 C2 105 120 17:20 471.8 0.64 1.75 1.75 74 253 251 250 39 50 50 4 C3 120 135 17:35 482.4 0.65 1.78 1.78 74 252 251 251 39 51 50 4 D1 135 150 17:50 493.3 0.71 1.94 1.94 74 252 250 251 40 51 51 4 D2 150 165 18:05 504.9 0.64 1.75 1.75 75 251 251 250 41 51 51 4 D3 165 180 18:20 515.6 0.64 1.75 1.75 75 251 251 249 41 52 51 4 18:35 526.468 3/13/2013 nsas Leak Rate (cfm): Century Aluminum Sampling Location: Line 4 Main Stack Run No.: 3 SAH/CER Vacuum (in Hg):

Nozzle (Yes/No): Leak Check Total Volume (ft3):

Sensitivity (in. H2O) Micro-manometer Used? Pitot (Yes/No): Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Run Date:

Tedlar Bags: N/A Nozzle diameter, Dn (in): Stack Thermocouple (Yes/No): Stack Thermocouple ID: Pitot tube coefficient, Cp: Unbilical Line: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Orsat Pump: N/A Probe Length/Type: Impinger 1: Nozzle ID: N/A Temperature: Impinger 3:

Filter No. 2: N/A O 2Concentration: Impinger 6: Pg (in. H2O): Impinger 4: Filter No. 1:

Silica Gel.:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Dry Gas Meter Temperature °F Pump

Vacuum (in. Hg) Final exit Temperature °F Impinger 5:

Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Velocity Head (**∆** P in H2O) Filter No. 3: N/A CO 2Concentration:Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 10 8 Job Number: 0.008 0.014 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 274.3 338.9 29.61 23 Filters 0.52 Concentrations N/A N/A 288 305.3 81.900

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 8:00 528.161 0.68 1.81 1.81 73 254 252 252 38 37 36 4 A2 15 30 8:15 539 0.53 1.42 1.42 72 252 252 252 43 40 39 4 A3 30 45 8:30 548.6 0.46 1.25 1.25 72 252 252 252 48 44 44 3 B1 45 60 8:45 557.9 0.69 1.88 1.88 73 253 253 253 53 48 47 4 B2 60 75 9:00 569.1 0.66 1.81 1.81 73 252 255 255 55 52 51 4 B3 75 90 9:15 580.1 0.62 1.71 1.71 74 252 253 253 54 53 53 4 C1 90 105 9:30 590.7 0.71 1.94 1.94 74 252 254 254 49 51 49 4 C2 105 120 9:45 602 0.66 1.8 1.8 74 253 254 254 47 50 49 4 C3 120 135 10:00 613.2 0.63 1.72 1.72 74 252 253 253 46 51 50 4 D1 135 150 10:15 623.7 0.69 1.89 1.89 74 252 253 253 46 51 50 4 D2 150 165 10:30 634.9 0.65 1.78 1.78 74 252 254 254 46 51 50 4 D3 165 180 10:45 645.9 0.62 1.7 1.7 74 251 253 253 45 51 51 4 11:00 656.724 Micro-manometer Used?

Nozzle ID: Temperature: Impinger 1:

Filter No. 1:

N/A Filter No. 3:

Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Filter No. 2:

Traverse Point No. Sampling Time

(min) Impinger Water Weight, Vlc: Impinger 3: Impinger 4: Sensitivity (in. H2O)

Silica Gel.:

Sample Rate Filter Temperature °F Impinger 2:

Impinger 5: Impinger 6: N/A

Pbar (in. Hg): Orsat Pump: Probe Length/Type: Tedlar Bags: Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp:

Century Aluminum

4 SAH/CER

Unbilical Line: N/A N/A Vacuum (in Hg):
Leak Rate (cfm): Equipment Identification Sampling Location:

Clock Time 24 hr Velocity Head (**∆** P in H2O) Nozzle (Yes/No): Stack Thermocouple (Yes/No):

N/A 13Q-73 N/A

N/A

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) nsas

Meter Box Correction Factor, Y: Meter Box pressure differential, Δ H@ (in H 2O):

CO 2Concentration: Nozzle diameter, Dn (in):

Pg (in. H2O):

O 2Concentration: Pitot (Yes/No): Run Date: Line 4 MainStack-B
Leak Check Total Volume (ft3): 3/14/2013Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 13 10 Job Number: 0.008 0.009 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 272.9 326.9 29.59 32 Filters 0.54 Concentrations N/A N/A 297.3 315.2 71.900

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 11:15 657.935 0.65 1.76 1.76 76 247 251 251 41 47 47 4 A2 15 30 11:30 668.6 0.6 1.63 1.63 76 251 252 252 39 51 51 4 A3 30 45 11:45 679.2 0.55 1.5 1.5 76 249 255 255 39 52 52 4 B1 45 60 12:00 689.3 0.73 2 2 76 252 254 254 39 53 53 5 B2 60 75 12:15 700.8 0.64 1.76 1.76 76 252 250 250 40 55 55 4 B3 75 90 12:30 711.8 0.48 1.32 1.32 76 253 253 253 39 55 55 4 C1 90 105 12:45 721.3 0.69 1.88 1.88 77 252 251 251 41 52 52 4 C2 105 120 13:00 732.6 0.58 1.58 1.58 76 252 253 253 42 52 52 4 C3 120 135 13:15 742.8 0.64 1.74 1.74 76 251 253 253 44 52 51 4 D1 135 150 13:30 753.7 0.67 1.83 1.83 76 252 252 252 44 51 50 4 D2 150 165 13:45 764.7 0.65 1.77 1.77 76 252 253 253 45 51 51 4 D3 165 180 14:00 775.6 0.6 1.63 1.63 76 252 253 253 45 51 50 4 14:15 786.232 Velocity Head (**∆** P in H2O) Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Impinger 4:

Filter No. 3: N/A CO 2Concentration: Silica Gel.: Impinger 6: Impinger 5:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Final exit

Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) N/A Temperature:

Filter No. 2: N/A O 2Concentration: Filter No. 1: 13Q-74 Nozzle ID:
Pg (in. H2O): N/A Probe Length/Type:
Impinger 3: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Impinger 1: Stack Thermocouple (Yes/No): Stack Thermocouple ID: Pitot tube coefficient, Cp: Unbilical Line:

Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Orsat Pump: Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Pitot (Yes/No): Run Date: 3/14/2013 nsas

Nozzle (Yes/No):

Century Aluminum Sampling Location: Line 4 MainStack-B Run No.: 5 SAH/CER Vacuum (in Hg): Leak Check Total Volume (ft3): Leak Rate (cfm):Plant:

Method: 315 Checks Pre Mid Post Testing Operator: 11 Job Number: 0.005 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 255.2 301.5 29.6 38 Filters 0.54 Concentrations N/A N/A 301.7 321.5 66.100

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 15 14:30 788.351 0.68 1.85 1.85 77 252 252 42 50 50 4 A2 15 30 14:45 799.7 0.56 1.53 1.53 77 252 253 41 53 53 4 A3 30 45 15:00 809.7 0.54 1.48 1.48 76 248 255 43 53 53 4 B1 45 60 15:15 819.7 0.75 2.05 2.05 76 251 255 46 52 52 4 B2 60 75 15:30 831.5 0.67 1.83 1.83 76 253 253 46 53 53 4 B3 75 90 15:45 842.5 0.65 1.78 1.78 76 255 255 44 54 54 4 C1 90 105 16:00 853.5 0.73 2 2 76 255 254 43 54 54 4 C2 105 120 16:15 865.2 0.64 1.76 1.76 76 253 256 41 55 55 4 C3 120 135 16:30 876 0.64 1.76 1.76 76 253 255 40 55 55 4 D1 135 150 16:45 886.9 0.69 1.9 1.9 76 254 256 40 56 56 4 D2 150 165 17:00 898.1 0.65 1.79 1.79 76 253 255 39 56 56 4 D3 165 180 17:15 909 0.63 1.74 1.74 76 253 255 40 57 56 4 17:30 919.918 Velocity Head (**∆** P in H2O) Traverse Point No. Sampling Time

(min) Clock Time

24 hr Dry Gas Meter

Reading (Vm,ft3) Impinger 4:

Filter No. 3: N/A CO 2Concentration: Silica Gel.: Impinger 6: Impinger 5:

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Final exit

Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) N/A Temperature:

Filter No. 2: N/A O 2Concentration: Filter No. 1: 13Q-75 Nozzle ID:
Pg (in. H2O): N/A Probe Length/Type:
Impinger 3: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Impinger 2: Impinger 1: Stack Thermocouple (Yes/No): Stack Thermocouple ID: Pitot tube coefficient, Cp: Unbilical Line:

Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Orsat Pump: Reagent Box: N/A Meter Box Correction Factor, Y: Equipment Identification Pitot (Yes/No): Run Date: 3/14/2013 nsas

Nozzle (Yes/No):

Century Aluminum Sampling Location: Line 4 MainStack-B Run No.: 6 SAH/CER Vacuum (in Hg): Leak Check Total Volume (ft3): Leak Rate (cfm):Plant:

Method: 29 Checks Pre Mid Post Testing Operator: 13 11 Job Number: 0.008 0.013 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 266.7 323.2 29.25 36 Filters 0.55 21.9 24.7 Concentrations N/A N/A 300.9 320.4 78.800

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 8:30 727.279 0.71 1.96 1.96 77 249 252 252 39 49 49 2 A2 20 40 8:50 742.9 0.66 1.83 1.96 77 251 253 253 41 53 53 2 A3 40 60 9:10 757.8 0.48 1.34 1.34 77 250 253 253 41 55 55 2 B1 60 80 9:35 770.5 0.68 1.91 1.91 76 251 252 252 43 58 58 2 B2 80 100 9:55 785.8 0.59 1.67 1.67 77 253 255 255 47 63 63 2 B3 100 120 10:15 800.1 0.51 1.44 1.44 77 248 254 254 44 63 63 2 C1 120 140 10:35 813.6 0.72 2.04 2.04 77 250 254 254 42 62 62 2 C2 140 160 10:55 829.1 0.63 1.77 1.77 77 249 251 251 40 60 60 2 C3 160 180 11:15 844 0.38 1.07 1.07 77 251 253 253 41 61 61 2 D1 180 200 11:35 855.5 0.69 1.95 1.95 77 252 253 253 40 62 62 2 D2 200 220 11:55 861.5 0.68 1.93 1.93 77 255 255 250 41 62 62 2 D3 220 240 12:15 873.5 0.51 1.44 1.44 77 255 255 250 42 62 62 2 887.526 Micro-manometer Used?

Nozzle ID: Temperature: Tedlar Bags:

N/A

Traverse Point No. Sampling Time

(min) Filter No. 3: Filter No. 2: Impinger 1:

Sample Rate Filter Temperature °F Impinger 2:

Impinger 5: Impinger 6:

Stack Temperature °F Probe

Temperature °F Final exit Temperature °F Dry Gas Meter

Temperature °F Pump

Vacuum (in. Hg) Impinger Water Weight, Vlc: Impinger 3: Impinger 4: Sensitivity (in. H2O)

Silica Gel.: O 2Concentration: Filter No. 1: Reagent Box:
Stack Thermocouple ID: Pitot tube coefficient, Cp: N/A

Pbar (in. Hg): Orsat Pump: Probe Length/Type:

Century Aluminum

1 SAH/CER

Unbilical Line: N/A N/A Vacuum (in Hg):
Leak Rate (cfm): Equipment Identification Sampling Location:

Clock Time 24 hr Velocity Head (**∆** P in H2O) Nozzle (Yes/No): Stack Thermocouple (Yes/No):

N/A 13Q-70 N/A P-901/S N/A

Orfice Pressure Differential (Δ H, in H 20) Dry Gas Meter Reading (Vm,ft3) nsas

Meter Box Correction Factor, Y: Meter Box pressure differential, Δ H@ (in H 2O):

CO 2Concentration: Nozzle diameter, Dn (in):

Pg (in. H2O): Line 4 Main Stack
Leak Check Total Volume (ft3):

3/12/2013
Pitot (Yes/No): Run Date:Plant:

Method: 29 Checks Pre Mid Post Testing Operator: 12 9 Job Number: 0.005 0.013 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 263.8 341.9 29.27 43 Filters 0.53 21.7 28.7 Concentrations N/A N/A 307.6 332.4 109.900

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 12:40 865.026 0.65 1.83 1.83 79 247 253 250 39 52 52 2 A2 20 40 13:00 879.6 0.61 1.74 1.74 79 251 251 250 45 59 59 2 A3 40 60 13:20 894.5 0.53 1.52 1.52 79 250 254 250 48 62 62 2 B1 60 80 13:40 908.5 0.67 1.93 1.93 79 250 253 250 48 64 64 2 B2 80 100 14:00 923.7 0.59 1.7 1.7 79 252 253 250 48 66 66 2 B3 100 120 14:20 938.3 0.55 1.59 1.59 79 254 254 250 50 66 66 2 C1 120 140 14:40 952.2 0.7 2.02 2.02 79 251 256 250 51 66 66 2 C2 140 160 15:00 967.8 0.63 1.82 1.82 79 251 255 250 49 66 66 2 C3 160 180 15:20 982.9 0.47 1.35 1.35 79 252 255 250 49 65 65 2 D1 180 200 15:40 995.8 0.62 1.79 1.79 79 249 252 250 53 65 65 2 D2 200 220 16:00 999.5 0.6 1.72 1.72 79 250 250 250 52 65 65 2 D3 220 240 16:20 1015.8 0.59 1.7 1.7 79 250 250 250 52 66 66 2 1033.598 Pg (in. H2O):

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 2 0) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Final exit

Temperature °F Dry Gas Meter

Temperature °F Sampling Time (min) Pump Vacuum (in. Hg) Filter No. 3: N/A CO 2Concentration: Silica Gel.:

Dry Gas Meter Reading (Vm,ft3) Velocity Head (**∆** P in H2O) Filter No. 1: 13Q-71 Impinger 5:

Traverse Point No. Clock Time 24 hr Temperature: Impinger 3:

Filter No. 2: N/A O 2Concentration: Impinger 6: Impinger 4: Impinger 2: Orsat Pump: N/A Probe Length/Type: P-901/S Impinger 1: Nozzle ID: N/A Pitot tube coefficient, Cp: Unbilical Line: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Reagent Box: N/A Meter Box Correction Factor, Y: Stack Thermocouple (Yes/No): Stack Thermocouple ID: Equipment Identification Pitot (Yes/No): Run Date: 3/12/2013 nsas

Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: Line 4 Main Stack Run No.: 2 SAH/CER Vacuum (in Hg):Plant:

Method: 29 Checks Pre Mid Post Testing Operator: 12 12 Job Number: 0.006 0.008 Calibration Yes Yes 0.9968 Yes Yes 1.8559 Yes Yes 0.84 0.23 Moisture in: ml H2O Initial Final Ambient Conditions 262.9 329.8 29.24 48 21.6 56.8 Filters 0.56 Concentrations N/A N/A 303.2 319.8 118.700

Begin End Desired Actual Inlet Outlet Inlet Outlet A1 0 20 16:55 1.928 0.73 2.02 2.02 79 254 252 250 44 54 54 2 A2 20 40 17:15 17.7 0.62 1.74 1.74 79 255 252 250 44 61 61 2 A3 40 60 17:35 32.4 0.54 1.51 1.51 80 255 254 250 45 61 61 2 B1 60 80 17:55 45.9 0.71 1.99 1.99 80 254 253 250 46 61 61 2 B2 80 100 18:15 61.6 0.66 1.86 1.86 79 252 254 250 48 62 62 2 B3 100 120 18:35 76.7 0.48 1.35 1.35 79 253 254 250 47 63 63 2 C1 120 140 18:55 89.6 0.69 1.94 1.94 79 253 255 250 48 62 62 2 C2 140 160 19:15 105.1 0.58 1.63 1.63 79 254 255 250 49 62 62 2 C3 160 180 19:35 111.4 0.5 1.41 1.41 79 254 254 250 51 62 62 2 D1 180 200 19:55 132.4 0.71 1.99 1.99 79 251 255 250 49 59 59 2 D2 200 220 20:15 140.5 0.65 1.84 1.84 79 250 255 250 50 60 60 2 D3 220 240 20:35 145.3 0.6 1.72 1.72 79 250 255 250 51 60 60 2 162.551 0.6225 1.75 1.75 79.16666667 252.916667 254 250 47.6666667 60.583 60.583 2 Pg (in. H2O):

Sample Rate Impinger Water Weight, Vlc:

Orfice Pressure Differential (Δ H, in H 20) Stack Temperature °F Probe

Temperature °F Filter Temperature

°F Final exit

Temperature °F Dry Gas Meter

Temperature °F Sampling Time (min) Pump Vacuum (in. Hg) Filter No. 3: N/A CO 2Concentration: Silica Gel.:

Dry Gas Meter Reading (Vm,ft3) Velocity Head (**∆** P in H2O) Filter No. 1: 13Q-72 Impinger 5:

Traverse Point No. Clock Time 24 hr Temperature: Impinger 3:

Filter No. 2: N/A O 2Concentration: Impinger 6: Impinger 4: Impinger 2: Orsat Pump: N/A Probe Length/Type: Impinger 1: Nozzle ID: N/A Pitot tube coefficient, Cp: Unbilical Line: N/A Meter Box pressure differential, Δ H@ (in H 2O):

Pbar (in. Hg): Sensitivity (in. H2O) Micro-manometer Used? Tedlar Bags: N/A Nozzle diameter, Dn (in): Reagent Box: N/A Meter Box Correction Factor, Y: Stack Thermocouple (Yes/No): Stack Thermocouple ID: Equipment Identification Pitot (Yes/No): Run Date: 3/12/2013 nsas

Nozzle (Yes/No): Leak Check Total Volume (ft3): Leak Rate (cfm): Century Aluminum Sampling Location: Line 4 Main Stack Run No.: 3 SAH/CER Vacuum (in Hg):