APPENDIX VIII FACILITY AND PROCESS DATA

## CENTURY ALUMINUM ANODE PROCESSING DATA

NOTE: Numbers in green represent cell of Line 4. Numbers in red represent number of anodes changed d uring the night shift, during testing.

**Line 4**  **7**
**- May**  **8**
**- May**  **9**
**- May**  29 15 8 16 30 15 8 16 31 15 8 16 32 15 8 16 33 15 8 16 34 15 8 16 35 15 8 16 36 15 8 16 37 15 8 16 38 15 8 16 39 15 8 16 40 15 8 16 41 15 8 16 42 15 8 16 43 16 7 17 44 16 7 17 45 16 7 17 46 16 7 17 47 16 7 17 48 16 7 17 49 16 7 17 50 16 7 17 51 16 7 17 52 16 7 17 53 16 7 17 54 16 7 17 55 16 7 17 56 16 7 17 **Line 4**  **12**
**- Apr**  **13**
**- Apr**  **14**
**- Apr**  29 14 9 30 14 9 31 14 9 32 14 9 33 14 9 34 14 9 35 14 9 36 14 9 37 14 9 38 14 9 39 14 9 40 14 9 41 14 9 42 14 9 43 9 15 8 44 9 15 8 45 9 15 8 46 9 15 8 47 9 15 8 48 9 15 8 49 9 15 8 50 9 15 8 51 9 15 8 52 9 15 8 53 9 15 8 54 9 15 8 55 9 15 8 56 9 15 81 of 4 Table 3 Wet Scrubber Description 1. Control device description: Potline 1-4 Wet Scrubber
2. Stack or vent location of control device (use NAD83 and include six decimal places): ID No.: ___84______ Latitude: 37.943250__________ Longitude: -86.786596____ 3. Design collection efficiency and outlet concentrati on (add rows as necessary): Pollutant Collection Outlet Source of Efficiency * concentration Estimation * (if known) HF 90 Percent mg/dscf _3_

_______ So2 50 Percent mg/dscf __3__

_____ Percent mg/dscf ______

___ * 1 = Performance testing 2 = Engineering judgment 3 = Manufacturer specs. 4 = Title V permit application 5 = Other (specify)

_______________________
4. Device type: Venturi Vertical packed bed

Horizontal packed bed X Tray tower spray chamber Other (specify or describe):

5. Pressure mode of operation: X posit ive pressure negative pressure 6. Typical gas temperature: inlet 200 ° F outlet 79 °F
7. Gas flow rate: 1,640,000 acfm (at scr ubber outlet) 1,415,980 dscfm
8. Pressure drop across scrubber: 2-12 inches water column (in. H 2 O)
9. Liquid to gas ratio: gal/1,000 acf
10. Chemical usage rate (specify chemical and typical u sage rate, if applicable) Chemical added Usage rate Units for usage rate
Lime 100 Tons/week2 of 4

11. Identify each source served by this control device (add rows as necessary). Source ID No(s). Source description(s) EP (84) Equip 4200 Potline #1 CWPB3 EP (84) Equip 4220 Potline #2 CWPB3 EP (84) Equip 4230 Potline #3 CWPB3 EP (84) Equip 4240 Potline #4 CWPB3 12. Indicate what operational parameters of the control device are monitored to ensure that the control device is operating properly: Volumetric flow rate X Fan amperage Pressure drop X Water flow rate Other (specify):

. 13. What level of a monitored operational parameter tri ggers corrective action? Volumetric flow rate (acfm) 170-210 Fan amperage (amps) Pressure drop (in. H 2 O) 3,000 Water flow rate (gpm) Other (specify):

. 14. Additional comments and information:3 of 4 Table 4 Combination Dry Alumina Scrubber/Bag House Description 1. Control device description: Carbon Bake Scrubber

2. Stack or vent location of control device (use NAD83 and include six decimal places): ID No.: 41_________ Latitude: 37.948694__________ _ Longitude: -86.787524_____ 3. Design collection efficiency and outlet concentrati on (add rows as necessary):
Pollutant Collection Outlet Source of efficiency * concentration Estimation * (if known) POM 90 Percent mg/dscf ____3

_____ PM 90 Percent mg/dscf ____3_

____ HF 90 Percent mg/dscf ___3_

_____ * 1 = Performance testing 2 = Engineering judgment 3 = Manufacturer specs. 4 = Title V permit application 5 = Other (specify)

_______________________ 4. Scrubber device type: __X___ Fluidized bed ___X__ Injection ___X__ Other (specify or describe): _____cooling to wer_____________________

5. Bag cleaning method: __X___ Pulse jet _____ Reverse air _____ Shaker _____ Other (describe) ____________________________

_____________________

6. Pressure mode of operation: positi ve pressure X negative pressure

7. Typical gas temperature: inlet to scrubber 254 °F outlet from bag house 185 °F
8. Gas flow rate: 174,150 acfm (at bag h ouse outlet) 136,040 dscfm
9. Pressure drop: Across scrubber: Bed pressure 0.53 inches water column (in. H 2 O)

Across bag house: 8.0 inches water column (in. H 2 O)

10. Solid to gas ratio: ND lb/1,000 acf4 of 4

11. Alumina usage rate (differentiate between virgin an d recycled alumina from potlines)

Type of Alumina Added Usage rate Units for usage ra te Virgin alumina 3475 Lbs/hr Recycled alumina Other alumina (specify ________________) 12. Identify each emission source served by this contro l device (add rows as necessary). Source ID No(s). Description(s) EP (41) Anode Bake Furnaces 1,2 &3

13. Indicate what operational parameters of the control device are monitored to ensure that the control device is operating properly: X Volumetric flow rate Fan amperage Pressure drop X Visible em issions opacity Other (specify): Gas temp at cooling tower, Alu mina Feed rate

. 14. What level of a monitored operational parameter tri ggers corrective action? 119,232 SCFM Volumetric flow rate (acfm) Fan amperage (amps) Pressure drop (in. H 2 O) 20 Visible emissions opacity (%) Other (specify): Gas Temp-170/-208 F Alumina Flow rate- 3475 lbs/hr

. 15. Additional comments and information:5 of 4 Table 5 Electrostatic Precipitator (ESP) Descriptio n 1. Control device description: Potlines 1-4 ESP

2. Stack or vent location of each control device (use NAD83 and include six decimal places): ID No.: _84________ Latitude: 37.943250_____ Long itude: -86.786596__________
3. Design collection efficiency and outlet concentrati on (add rows as necessary): Pollutant Collection Outlet Source of efficiency * concentration Estimation * (if known) PM 94.5 Percent mg/dscf ___3__

____ Percent mg/dscf ______

___ Percent mg/dscf ______

___ * 1 = Performance testing 2 = Engineering judgment 3 = Manufacturer specs. 4 = Title V permit application 5 = Other (specify)

_______________________

4. Device type: X High-voltage, singl e-stage Low-voltage, two-stage

Wet Dry Other (specify or describe):
5. Pressure mode of operation: posit ive pressure X negative pressur e 6. Typical gas temperature: inlet 200  °F outlet  °F
7. Gas flow rate: 1,640,000 acfm (at ESP outlet) 1,415,980 dscfm
8. Collection plate surface area: _1800 per ESP (8 to tal)_____ ft 2
9. Secondary power: _____________ kW 10. Identify each emission source served by this contro l device (add rows as necessary). Source ID No(s). Description6 of 4

EP (84) Equip 4200 Potline #1 CWPB3 EP (84) Equip 4220 Potline #2 CWPB3 EP (84) Equip 4230 EP(84)Equip 4240 Potline #3 CWPB3 Potline #4 CWPB3 11. Indicate what operational parameters of the control device are monitored to ensure that the control device is operating properly:
X Visible emissions Volumet ric flow X Fan amperage opacity rate Secondary power X Secondar y voltage X Other (specify): Secondary current

.

12. What level of a monitored operational parameter tri ggers corrective action?
20 Visible emissions Volumet ric flow 170-210 Fan amperage opacity (%) rate (acfm) (amps) Secondary power 20-29 mVSecondary voltage (kW) (volts) 80-156 mA Other (specify): Secondary Current

.

13. Additional comments and information:7 of 4 Table 6 Combination Dry Coke Scrubber and Bag House Description 1. Control device description: NA
2. Stack or vent location of each control device (use NAD83 and include six decimal places): ID No.: _________ Latitude: _______________ Longi tude: ________________

3. Design collection efficiency and outlet concentrati on (add rows as necessary): Pollutant Collection Outlet Source of efficiency * concentration Estimation * (if known) Percent mg/dscf ______

___ Percent mg/dscf ______

___ Percent mg/dscf ______

___ * 1 = Performance testing 2 = Engineering judgment 3 = Manufacturer specs. 4 = Title V permit application 5 = Other (specify)

_______________________
4. Scrubber device type: _____ Fluidized bed _____ Injection _____ Other (specify or describe): ________________

_________________________ 5. Bag cleaning method: _____ Pulse jet _____ Reverse air _____ Shaker _____ Other (describe) ____________________________

_____________________ 6. Pressure mode of operation: posit ive pressure negative pressure
7. Typical gas temperature: inlet  °F outlet  °F
8. Gas flow rate: acfm (at bag hous e outlet) dscfm
9. Pressure drop: Across scrubber: inches water column (in. H 2 O)

Across bag house: inch es water column (in. H 2 O) 10. Solid to gas ratio: lb/1,000 acf8 of 4

11. Dry coke usage rate: NA

12. Identify each emission source served by this device (add rows as necessary). Source ID No(s). Description(s)

13. Indicate what operational parameters of the control device are monitored to ensure that the control device is operating properly: _______ Volumetric flow rate ____________ Fan amper age _______ Visible emissions opacity ____________ Pres sure drop Other (specify):

. 14. What level of a monitored operational parameter tri ggers corrective action? _______ Volumetric flow rate (acfm) ____________ Fa n amperage (amps) _______ Visible emissions opacity (%) ____________ Pressure drop (in. H 2 O) Other (specify):

. 15. Additional comments and information:9 of 4 Table 7 Other Air Pollution Control Devices 1. Control device description: Potline 1-4 Wet Scrubber Cyclone

2. Stack or vent location of each control device (use NAD83 and include six decimal places): ID No.: _84________ Latitude: 37.943250______ Lon gitude: -86.786596_________
3. Design collection efficiency and outlet concentrati on (add rows as necessary): Pollutant Collection Outlet Source of efficiency * concentration Estimation * (if known) PM 80 Percent mg/dscf ___3__

____ Percent mg/dscf ______

___ Percent mg/dscf ______

___ * 1 = Performance testing 2 = Engineering judgment 3 = Manufacturer specs. 4 = Title V permit application 5 = Other (specify)

_______________________ 4. Pressure mode of operation: posit ive pressure X negative pressur e 5. Typical gas temperature: inlet 65 °F outlet °F 6. Gas flow rate: 5000 acfm Specify locat ion: _______________________________

Dscfm 7. Identify each emission source served by this contro l device (add rows as necessary). Source ID No(s). Source description(s) EP (84) Equip 4200 Potline #1 CWPB3 EP (84) Equip 4220 Potline #2 CWPB3 EP (84) Equip 4230 Potline #3 CWPB3 EP (84) Equip 4240 Potline #4 CWPB3
8. Indicate what operational parameters of the control device are monitored to ensure that the control device is operating properly: Visible emissions opacity Volumetric flow rate Pressure drop Other (specify):

.10 of 4

9. What level of a monitored operational parameter tri ggers corrective action? Visible emissions opacity (%) Volumetric flow rate (acfm) Pressure drop (in. H 2 O) Other (specify):

. 10. Additional comments and information: