### West Virginia Department of Environmental Protectio n

Division of Air Quality

# 	
Pursuant to 

## Title V of the Clean Air Act

Issued to:

## 	






  !" "#



## 		


Issued: April 13, 2010 • Effective: April 27, 2010 Expiration: April 13, 2015 • Renewal Application Due: October 13, 2014Title V Operating Permit R30-03500002-2010 Page 1 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### Permit Number: R30-03500002-2010 Permittee: Century Aluminum of West Virginia, Inc. Facility Name: Ravenswood Operations Permittee Mailing Address: P. O. Box 98 Ravenswood, WV 26164-0098

This permit is issued in accordance with the West V irginia Air Pollution Control Act (West Virginia Co de §§ 22-5-1 et seq.) and 45CSR30 — Requirements for Operating Permits. The permittee identified at the above-referenced facili ty is authorized to operate the stationary sources of air pollutants identified herein in accordance with all terms and co nditions of this permit.



### Facility Location: Ravenswood, Jackson County, Wes t Virginia Telephone Number: 304-273-7300 Type of Business Entity: Corporation Facility Description: Primary Aluminum Plant SIC Codes: 3334 UTM Coordinates: 428.3 km Easting • 4308.6 km Northing • Zone 17 Permit Writer: Bobbie Scroggie

Any person whose interest may be affected, includin g, but not necessarily limited to, the applicant an d any person who participated in the public comment process, by a pe rmit issued, modified or denied by the Secretary may appeal such action of the Secretary to the Air Quality Board pursuant to article one [§§ 22B-1-1 et seq.], Chapter 22B of the Code of West Virginia. West Virginia Code §22-5-14.

Issuance of this Title V Operating Permit does not supersede or invalidate any existing permits under 45CSR13, 14 or 19, although all applicable requirements from such perm its governing the facility's operation and complian ce have been incorporated into the Title V Operating Permit.Title V Operating Permit R30-03500002-2010 Page 2 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### Table of Contents 1.0. Emission Units and Active R13, R14, and R19 Per mits . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1. Emission Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2. Active R13, R14, and R19 Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 

### 2.0. General Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.2. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3. Permit Expiration and Renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.4. Permit Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.5. Reopening for Cause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.6. Administrative Permit Amendments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.7. Minor Permit Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.8. Significant Permit Modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.9. Emissions Trading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.10. Off-Permit Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.11. Operational Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.12. Reasonably Anticipated Operating Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.13. Duty to Comply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.14. Inspection and Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.15. Schedule of Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.16. Need to Halt or Reduce Activity not a Defense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.17. Emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.18. Federally-Enforceable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2.19. Duty to Provide Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2.20. Duty to Supplement and Correct Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2.21. Permit Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2.22. Credible Evidence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.23. Severability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.24. Property Rights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.25. Acid Deposition Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 

### 3.0. Facility-Wide Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.1. Limitations and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.2. Monitoring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.3. Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.4. Recordkeeping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.5. Reporting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.6. Compliance Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.7. Permit Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 

### 4.0. Manufacturing Process Groups A-G Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.1. Limitations and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.2. Monitoring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.3. Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.4. Recordkeeping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.5. Reporting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.6. Compliance Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Title V Operating Permit R30-03500002-2010 Page 3 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 5.0. Manufacturing Process Group H Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.1. Limitations and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.2. Monitoring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.3. Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.4. Recordkeeping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.5. Reporting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.6. Compliance Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 

### 6.0. Storage Structure Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.1. Limitations and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.2. Monitoring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.3. Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.4. Recordkeeping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.5. Reporting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.6. Compliance Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 

### 7.0. Manufacturing Process Group I Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7.1. Limitations and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 7.2. Monitoring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.3. Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.4. Recordkeeping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.5. Reporting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 7.6. Compliance Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 

### 8.0. Fuel Burning Unit Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8.1. Limitations and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 8.2. Monitoring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 8.3. Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 8.4. Recordkeeping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 8.5. Reporting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 8.6. Compliance Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 

### 9.0. Primary Aluminum MACT Sources Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

9.1. Limitations and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 9.2. Monitoring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 9.3. Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 9.4. Recordkeeping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.5. Reporting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 9.6. Compliance Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 

### APPENDIX A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Title V Operating Permit R30-03500002-2010 Page 4 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 1.0 Emission Units and Active R13, R14, and R19 Per mits 1.1. Emission Units Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

GROUP A - BARGE UNLOADING 001P101 001P101A 001S107 Vacuum Truck Unloading/AIF 3 - Cryolite Railcar Unloading and Conveyor 1957 400,000 lb/hr Baghouse DC-4 905 001P102 Fugitives Barge Unloading (Hartmann Unloader System) 1977 -- -- 001P103 001S110 No. 1 North Unloader 1977 350,000 lb/hr Fabric Dust Collector 001P104 001S111 No. 2 South Unloader 1977 350,000 lb/hr Fabric Dust Collector

001P105 001S101

001S102 Conveyor A 1977 960,000 lb/hr Baghouse DC-1 901 Baghouse DC-2A 902

001P106 001S102

001S103 Conveyor B 1977 960,000 lb/hr Baghouse DC-2A 902 Baghouse DC-2B 903 001P107 001S102 Alumina Silo No. 1 West 741 1977 960,000 lb/hr Baghouse DC-2A 902 001P108 001S103 Alumina Silo No. 2 East 742 1977 Baghou se DC-2B 903 001P109 001S106 Parallel Screens 701/702/703/704 1977 2 40,000 lb/hr Baghouse DC-3 904 001P110 001S108 Conveyor 1 1977 400,000 lb/hr Baghouse DC-3 904 001P111 001S109 Conveyor 2 1977 360,000 lb/hr Baghouse DC-5 906 001P112 001S106 (4) Tote Bins 1977 150 lb/hr Baghouse DC-3 904

001P113 001S104

001S105 Carbon Ore Bin 11-9206 1976 30,000 lb/hr Baghouse DC11-412 Baghouse DC11-429 001P113A -- Blending Station No. 4 Belt 1977 30,000 lb /hr Baghouse DC11-429 001P114 001S108 Fresh Alumina Bin 11-9201 1976 400,000 lb/hr Baghouse DC11-102 001P115 001S108 Vibrating Fresh Alumina Screen 1976 40 ,000 lb/hr Baghouse DC11-102 001P116 001S108 Fresh Ore Booth Conveying System 1976 40,000 lb/hr Baghouse DC11-102 GROUP B - MATERIAL TRANSFER TO/FROM POTROOM 001P201 001P201A 001P201B 001P201C 001P201D 001P201E 001P201F 001S201

001S201 001S203 001S205 001S205 001S205 001S204 Air Slide 372

Air Lift 374, Disengaging Bin 374 Air Slide 470 Air Lift 471 Disengaging Bin 471, Air Slides 404 & 472 Air Slide 473 Air Slide 405, Air Slide 474 1976 40,000 lb/hr Baghouse DC 395 Baghouse DC 395 Baghouse DC 495 Baghouse DC 476 Baghouse DC 476 Baghouse DC 476 Baghouse DC 406Title V Operating Permit R30-03500002-2010 Page 5 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 001P202 001P202A 001P202B 001P202C 001P202D 001S202

001S206 001S204 001S204 001S202 Air Slide 302

Air Slide 400 Air Slide 403 Air Lift 401, Disengaging Bin 401 Air Lift 304, Disengaging Bin 304 1976 40,000 lb/hr Baghouse DC 430 Baghouse DC 267 Baghouse DC 406 Baghouse DC 406 Baghouse DC 430 001P203 001P203A 001S207

001S208 Air Slide 021, Air Slide 025, Air Lift 022,

Disengaging Bin 022 Air Lift 250, Disengaging Bin 250 1976 80,000 lb/hr Baghouse DC 030 Baghouse DC 108

001P204 001S210 Parallel Vibrating Screens 004 and 014 and Tote, Air Slide 102 1976 80,000 lb/hr Baghouse DC 425

001P205 001S210 Alumina Bin 125 1976 80,000 lb/hr Baghouse DC 425 001P206 001S209 Air Slide 172, Air Lift 174, Disengag ing Bin 174 1976 80,000 lb/hr Baghouse DC 178 001P207 001S209 Alumina Bin 195 1957 80,000 lb/hr Baghouse DC 178 004P105 004S101 Potroom Silo 1A 1957 360,000 lb/hr Baghouse DC 1A 004P106 004S102 Potroom Silo 1C 1957 360,000 lb/hr Baghouse DC 1C 004P107 004S103 Potroom Silo 1D 1957 40,000 lb/hr Baghouse DC 1D 004P108 004S104 Potroom Silo 1B 1957 360,000 lb/hr Baghouse DC 1B 004P109 004S105 Potroom Silo 2A 1957 360,000 lb/hr Baghouse DC 2A 004P110 004S106 Potroom Silo 2C 1957 40,000 lb/hr Baghouse DC 2C 004P111 004S107 Potroom Silo 2D 1957 40,000 lb/hr Baghouse DC 2D 004P112 004S108 Potroom Silo 2B 1957 360,000 lb/hr Baghouse DC 2B 004P205 004S201 Potroom Silo 3A 1957 40,000 lb/hr Baghouse DC 3A 004P206 004S202 Potroom Silo 3C 1957 360,000 lb/hr Baghouse DC 3C 004P207 004S203 Potroom Silo 3D 1957 360,000 lb/hr Baghouse DC 3D 004P208 004S204 Potroom Silo 3B 1957 40,000 lb/hr Baghouse DC 3B 004P209 004S205 Potroom Silo 4A 1957 40,000 lb/hr Baghouse DC 4A 004P210 004S206 Potroom Silo 4C 1957 360,000 lb/hr Baghouse DC 4C 004P211 004S207 Potroom Silo 4D 1957 360,000 lb/hr Baghouse DC 4D 004P212 004S208 Potroom Silo 4B 1957 360,000 lb/hr Baghouse DC 4B 004P217 004S301 Fill Station 1957 20,000 lb/hr Phase 2 Scrubber 004P218 004S301 Bath Cart 1957 20,000 lb/hr Phase 2 Scrubber 004P219 004S301 Apollo Fill Station 1957 40,000 lb/hr P hase 2 Scrubber 004P301 004S304 Air Slide 270, Air Slide 271, Air Sli de 277 1976 40,000 lb/hr Baghouse DC 273 004P302 004S302 Air Slide 200, Air Slide 207 1976 40,0 00 lb/hr Baghouse DC 203Title V Operating Permit R30-03500002-2010 Page 6 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 004P303 004S304 Air Slide 370, Air Slide 371 1976 40,0 00 lb/hr Baghouse DC 273 004P304 004S303 Air Slide 300, Air Slide 301 1976 40,0 00 lb/hr Baghouse DC 262 004P305 001S202 Air Slide 264, Air Slide 303 1976 40,0 00 lb/hr Baghouse DC 430 GROUP C - BATH PROCESSING 001P301 N/A Pure Bath Bin 75 T 1957 20,000 lb/hr -- 001P302 N/A Pure Bath Bin 125 T 1957 -- 001P303 N/A Contaminated Bath Bin 125T 1957 -- 001P304 001S303 Feed Storage Bin 156-103 1957 26,600 l b/hr Baghouse DC156-400 001P305 001S303 Cascade Mill 156-200 1957 26,600 lb/hr Baghouse DC156-400 001P306 001S303 Magnetic Separator 156-214 1957 26,600 lb/hr Baghouse DC156-400 001P307 001S303 Skip Bucket 1957 20,000 lb/hr Baghouse DC156-400 001P308 001S303 Skip Bucket 1957 20,000 lb/hr Baghouse DC156-400 001P309 001S303 Vibrating Screen 156-203 1957 26,600 l b/hr Baghouse DC156-400 001P310 001S303 Fines Storage Bin 1957 26,600 lb/hr Baghouse DC156-400 001P311 001S303 Bagging Machine 156-501 1957 26,600 lb /hr Baghouse DC156-400 001P312 001P312A 001P312B 001P312C 001P312D 001S305

001S302 001S301 001S304 001S301 Cyclone 156-206

Air Lift 156-304, Disengaging Bin 156-305 Air Slide 156-309 Air Lift 156-309 Disengaging Bin 156-310 1957 26,600 lb/hr Baghouse DC156-207 Baghouse DC156-407 Baghouse DC156-409 Baghouse DC156-412 Baghouse DC156-412 001P313 001S304 Bath Storage 156-317 1957 20,000 lb/hr Baghouse DC156-412 001P314 001S304 Bath Storage 156-315 1957 Baghouse DC15 6-412 001P314A 001S304 300 Belt 1957 Baghouse DC156-412 001P315 001S303 Skip Hoist 1957 20,000 lb/hr Baghouse DC156-400 GROUP D - ANODE MIX, PRESS & PREP. 002P136 -- Liquid Pitch Unloading 1997 -- -- 002P137 -- Liquid Pitch Storage Tank No.1 1997 -- -- 002P138 -- Liquid Pitch Storage Tank No. 2 1997 -- -- GROUP E - CATHODE PASTE 002P201 002S101 Vibrating Screening/Sizing 1957 40,000 lb/hr Baghouse R-3 002P202 002S201 Conveyor K-10 1957 40,000 lb/hr Baghouse R-3 002P203 002S201 Roll Crusher M-7 1957 40,000 lb/hr Baghouse R-3Title V Operating Permit R30-03500002-2010 Page 7 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 002P204 002S201 Mill Feed Bin 1957 40,000 lb/hr Baghouse R-3 002P205 002S201 Fine Grind Mill D-2 1957 40,000 lb/hr B aghouse R-3 002P206 002S201 Conveyor K-11 1957 40,000 lb/hr Baghouse R-3 002P207 002S201 Air Classifier G-2 1957 40,000 lb/hr Baghouse R-3 002P208 002S201 Cyclone P-2 1957 40,000 lb/hr Baghouse R-3 002P209 002S201 Coal Fines Storage Bin 1957 40,000 lb/hr Baghouse R-3 002P210 002S201 Coal Intermediate Storage Bin 1957 40, 000 lb/hr Baghouse R-3 002P211 002S201 Coal Storage Bin 1957 40,000 lb/hr Baghouse R-3 002P212 002S201 Coal Fines Storage Bin 1957 40,000 lb/hr Baghouse R-3 002P214 002S201 Weigh Larry 1957 40,000 lb/hr Baghouse R-3 002P215 002V203

002S202 Batch Mixer AF-17 1957 40,000 lb/hr Baghouse R-7 002P216 Batch Mixer AF-18 1957 40,000 lb/hr Baghouse R -7 002P218 -- Press Reject Conveyor 1957 40,000 lb/hr -- 002P219 -- Green Scrap Storage Pile 1957 40,000 lb/hr -

- 002P220 002S202 Roll Crusher M-5C 1957 40,000 lb/hr Bag house R-7 002P221 002S202 Roll Crusher M-5B 1957 40,000 lb/hr Bag house R-7 GROUP F - COAL AND COKE UNLOADING 002P301 002P301A 002P301B --

002S301

-- Coal, Coke, and Pitch Unloading Feeder AA-1, Feeder V-1, Belt 1-1 Bucket Elevator S-1. Screws K-12, K-13, K-14 1957 140,000 lb/hr 140,000 lb/hr 140,000 lb/hr --

Baghouse R-1

-- 002P302 -- Coal and Coke Storage Silos 1-4 and 8-11(8 ) 1957 140,000 lb/hr -- 002P303 -- Belt 1-3 1957 120,000 lb/hr -- 002P304 002S101 Roll Crusher M-3 1957 80,000 lb/hr R232 Dust Coll.

002P305 002S101 K-3A, K-3B, S-3, Y-1, AM-1&2 Vibrating Screen 1957 160,000 lb/hr R232 Dust Coll.

002P306 002S303 Screw K-27, Bin 18, Bin 19, Disc W01, Fine Grind Mill D-1 1957 100,000 lb/hr Baghouse R-2

002P307 002S303 Air Classifier G-2 1957 50,000 lb/hr Baghouse R-2 002P308 002S303 Cyclone P3 1957 50,000 lb/hr Baghouse R-2 002P309 002S303 Cyclone P1 1957 50,000 lb/hr Baghouse R-2 002P310 002S101 Feeder AA-20, Roll Crusher M-6 1957 60 ,000 lb/hr R232 Dust Coll. 002P310A 002S101 Bin 50 1957 60,000 lb/hr R232 Dust Coll.Title V Operating Permit R30-03500002-2010 Page 8 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 002P311 002S101 Bucket Elevator S-6, Vibrating Screen AM-4 1957 60,000 lb/hr R232 Dust Coll. 002P312 002S101 Screws K-5, K-20, Coke Fines Bins 53- 68 1957 50,000 lb/hr R232 Dust Coll. 002P313 002S101 Screw Conveyor K-18, Coke Coarse Bins 20-31 1957 50,000 lb/hr R232 Dust Coll. 002P314 002S101 Screw Conveyor K-19, Anode Butts Bins 36-41 1957 50,000 lb/hr R232 Dust Coll. 003P315 -- Bin 17 1957 -- -- GROUP G - ANODE BLOCKS 003P101 003S105 51 Bin 1957 40,000 lb/hr Bin Vent 51BV 003P102 003S101 Belt Conveyor BC-5 1957 93,600 lb/hr -- 003P103 003S101 Coke Tubs 1957 60,000 lb/hr Baghouse No. 1 003P104 003104 15 Ton Make-Up Bin 1957 40,000 lb/hr --

003P106 003S103A

003S103B Portable ECL Bins 1957 60,000 lb/hr ECL Baghouse

003P111 003S102 Anode Cleaner 1957 1,000 lb/hr Baghouse No. 2 003P113 003S101 Screening Station 1957 60,000 lb/hr Baghouse No. 1 003P114 003S101 Vibramill 1957 60,000 lb/hr Baghouse No. 1 003P115 -- Bucket Elevator 1957 2,000 lb/hr -- 003P116 003S102 Bucket Elevator 1957 2,000 lb/hr -- 003P117 003S102 Anode Bins, Cleaning Station 1957 2,0 00 lb/hr -- 003P118 003S101 Belt Conveyor BC-6 1957 60,000 lb/hr Ba ghouse No. 1 003P119 003S101 Screen Hopper 1957 60,000 lb/hr Baghouse No. 1 003P120 003S101 Screw Conveyor SC-1 1957 60,000 lb/hr B aghouse No. 1 003P201 003P201A 003S203

003S201 No. 2 Bin Fresh Alumina

Air Slide 201 1976 30,000 lb/hr 10,000 lb/hr Baghouse DC11-407

Baghouse DC11-570

003P202 003S202 No. 3 Bin, Air Slide 300, Air Lift 300, Disengaging Bin 300 1976 10,000 lb/hr Baghouse DC 11-470 003P203 003S201 Reacted Booth System 1976 30,000 lb/hr Baghouse DC11-570 GROUP H - RODDING DEPARTMENT 003P301 003S309 Horizontal Press 1957 60,000 lb/hr Bertha DC 003P302 003S309 Cone Crusher 1957 60,000 lb/hr Bertha DC 003P303 003S309 Secondary Crusher 1957 60,000 lb/hr Bertha DC 003P304 003S302 Belt Conveyor #4 1957 60,000 lb/hr Baghouse No. 2 003P305 003S304 Belt Conveyor #24 1957 60,000 lb/hr Bag house No. 2Title V Operating Permit R30-03500002-2010 Page 9 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 003P306 003S302 Butt Removal 1957 60,000 lb/hr Baghouse No. 2 003P307 003S302 Butt Crusher 1957 60,000 lb/hr Baghouse No. 2 003P308 -- Magnetic Separator 1957 60,000 lb/hr -- 003P309 003V302 Thimble Press 1957 6,000 lb/hr -- 003P310 003S303 Thimble Cleaner, Belts 29, 29A, and 3 0 1957 6,000 lb/hr Baghouse No. 3 003P311 003S304 (3) Electric Arc Furnaces 1957 60,000 lb/hr Electric Arc DC 003P312 003S303 Rod Cleaning 1957 60 lb/hr Baghouse No. 3 003P313 003V306 Stub Dryer 1957 -- -- 003P314 003S304 Hole Cleaner 1957 225 lb/hr Electric Arc DC 003P315 -- Hole Dryer 1957 -- -- 003P316 003S304 Pouring and Assembly Station 1957 75,0 00 lb/hr Electric Arc DC 003P317 003V308 Chamfer 1957 -- -- 003P318 003V305 Stub Saw 1957 -- -- 003P319 003V305 Welding Station 1957 -- -- 003P320 003V307 Thimble Press, Combination Press 1957 60,000 lb/hr -- 003P321 003S302 Belt Conveyor #22 1957 60,000 lb/hr Bag house No. 2 003P322 003S302 Belt Conveyor #23 1957 60,000 lb/hr Bag house No. 2 003P323 003S305 Rough Cleaning Machine 1957 60,000 lb/hr Baghouse No. 5 003P324 003S309 Anode Fine Cleaning (Shot Blast) Mach ine 1957 60,000 lb/hr Bertha DC 003P325 003S305 Bath Belt Conveyor 1957 60,000 lb/hr Ba ghouse No. 5 003P326 003S305 Surge Hopper 1957 60,000 lb/hr Baghouse No. 5 003P327 003S305 Crushed Feed Conveyor 1957 60,000 lb/h r Baghouse No. 5 003P328 003S305 Bath Crusher 1957 60,000 lb/hr Baghouse No. 5 003P329 003S305 Bath Screen Feed Conveyor 1957 60,000 lb/hr Baghouse No. 5 003P330 003S305 Bath Screen 1957 60,000 lb/hr Baghouse No. 5 003P331 003S305 Surge Hopper 1957 60,000 lb/hr Baghouse No. 5 003P332 003S305 Bath Silo 1957 60,000 lb/hr Baghouse No. 5 003P333 003S310 No. 1 Storage Bin 1957 0.403 lb/hr Bin V ent 971BVTitle V Operating Permit R30-03500002-2010 Page 10 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 GROUP I - MISCELLANEOUS SOURCES 005P104A 005S108 Paste Mixer 1957 -- Dust Collector 005P105 005S101 Carpenter Shop Saws 1957 -- Cyclone 005P106 005S109 Paint Booth used for storage 1957 -- -- 005P107 005S110 Paste Heaters 1957 -- -- 005P108 005S111 Shell Rebuild 1957 -- -- 005P109 005S102 Reduction Cell Super Structure Cleani ng Booth 1957 -- Pot Lining Baghouse 005P110 005S114 Spent Pot Lining Disposal 1976 1600 l b/hr SPL Dust Collector 005P111 005S104A Module Cleaning Booth 1976 -- Baghouse 005P112 005S113 Rod Preheaters 1957 -- -- 005P113 -- Crucible Heaters 2001 -- -- 005P114 005S115 TAC System Unit #1 2001 46,000 lb/hr Ba ghouse R-442 005P115 005S115 TAC System Unit #2 2001 46,000 lb/hr Ba ghouse R-442 005P116 005S112 Crucible Cleaner 2009 2,000 lb/hr Baghouse 005C112 005P117 005S112 Siphon Cleaner 2009 150 lb/hr Baghouse 005C112 FUEL BURNING SOURCES 002P139 002S110 Hot Oil Heater No. 1 1997 1.25 mmBtu/hr

-- 002P140 002S111 Hot Oil Heater No. 2 1997 1.25 mmBtu/h r -- 005P102 005S106 Boiler No. 2; Superior Boilers 223V 19 57 43.5 mmBtu/hr -- 005P103 005S107 Boiler No. 4; Cleaver Brooks D76-RH 19 97 76.0 mmBtu/hr --

005P104 005S106 Boiler No. 5; English Boiler & Tube, Inc. 30-SD250 2003 37.5 mmBtu/hr --

PRIMARY ALUMINUM MACT SOURCES 002P101 002S101 Scrap & Rejects Storage Bin North 1957 60,000 lb/hr

Venturi Reactor VR371Sonair Baghouse R300 002P102 002S101 Scrap & Rejects Storage Bin South 1957 60,000 lb/hr 002P103 002S101 Coke Fines Storage Bin North 1957 100,0 00 lb/hr 002P104 002S101 Coke Fines Storage Bin South 1957 100,0 00 lb/hr 002P105 002S101 Coke Coarse Storage Bin North 1957 100, 000 lb/hr 002P106 002S101 Coke Coarse Storage Bin South 1957 100, 000 lb/hr 002P107 002S101 Crushed Anode Butts Storage Bin North 1957 100,000 lb/hr 002P108 002S101 Crushed Anode Butts Storage Bin South 1957 100,000 lb/hrTitle V Operating Permit R30-03500002-2010 Page 11 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 002P109 -- Hard Pitch Storage Bin North 1957 -- -- 002P110 -- Hard Pitch Storage Bin South 1957 -- -- 002P111 002S101 Auto Scale AL-1 1957 100,000 lb/hr Venturi Reactor VR371Sonair Baghouse R300 002P112 002S101 Auto Scale AL-2 1957 100,000 lb/hr 002P113 002S101 Screw Conveyor K-101 1957 100,000 lb/hr 002P114 002S101 Batch Car 1957 100,000 lb/hr 002P115 002S109 South Mixers 1-8 1957 100,000 lb/hr Baghouses 002C104, 002C105 002P116 002S109 North Mixers 9-16 1957 100,000 lb/hr 002P117 002S109 Belt Conveyor I-6 1957 64,000 lb/hr Baghouses 002C104, 002C105 002P118 002S109 Belt Conveyor I-7 1957 64,000 lb/hr 002P119 002S109 Belt Conveyor V-4 1957 128,000 lb/hr Baghouses 002C104, 002C105 002P120 002S109 Belt Conveyor I-8 1957 128,000 lb/hr 002P121 002S109 Belt Conveyor I-9 1957 128,000 lb/hr 002P122 002S109 Belt Conveyor I-10 1957 128,000 lb/hr 002P123 002S109 Cooling Screw AG-1 1957 128,000 lb/hr Baghouses 002C104, 002C105 002P124 002S109 Cooling Screw AG-2 1957 128,000 lb/hr 002P125 002S109 Cooling Screw AG-3 1957 128,000 lb/hr 002P126 002S109 Cooling Screw AG-4 1957 128,000 lb/hr 002P127 002S109 Disc Feeder W11 1957 128,000 lb/hr Baghouses 002C104, 002C105 002P128 002S109 Disc Feeder W12 1957 002P129 002S109 Anode Press AJ-1 1957 128,000 lb/hr Baghouses 002C104, 002C105 002P130 002S109 Anode Press AJ-2 1957 002P131 002S109 Belt Conveyor I-11 1957 128,000 lb/hr Baghouses 002C104, 002C105 002P132 002S109 Screw Conveyor K-103 1957 128,000 lb/hr 002P133 002S109 Green Scrap Area 1957 128,000 lb/hr 002P134 002S109 Fresh Coke Fines Storage Tank 1957 50, 000 lb/hr Baghouse 002C104 002P135 002S109 Screw Conveyor K-321 1957 2,400 lb/hr Baghouse 002C104 002P141 002S101 Screw Conveyor K-100 1957 100,000 lb/hr Baghouse 002C106 002P142 002S101 Collecting Hopper 1957 100,000 lb/hr Bag house 002C106 002P143 002S109 K-312 Screw Conveyor 1957 50,000 lb/hr Baghouse 002C104Title V Operating Permit R30-03500002-2010 Page 12 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Emission

Point ID Emission Unit Description Year Installed Design

Capacity Control Device

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 003P109 003S204 Building No. 52 Ring Furnace 1957 Capacity is based on green anodes capacity Anode Bake Furnace

Scrubber System (28 stacks) 003C205 (bypass) 003P110 003S204 Building No. 53 Ring Furnace 1957 004P101

004S301 Reduction Cells Potroom 1A 1957 14,500 lb/hr

Scrubber 004C302 004P102 Reduction Cells Potroom 1B 1957 14,500 lb/hr 004P103 Reduction Cells Potroom 2A 1957 14,500 lb/hr 004P104 Reduction Cells Potroom 2B 1957 14,500 lb/hr 004P201 Reduction Cells Potroom 3A 1957 14,500 lb/hr

Scrubber 004C301 004P202 Reduction Cells Potroom 3B 1957 14,500 lb/hr 004P203 Reduction Cells Potroom 4A 1957 14,500 lb/hr 004P204 Reduction Cells Potroom 4B 1957 14,500 lb/hr 004P113 -- Ore Bucket - Line 1A 1957 120,000 lb/hr Bagho use DC 1 004P114 -- Ore Bucket - Line 1B 1957 120,000 lb/hr Bagho use DC 2 004P115 -- Ore Bucket - Line 2A 1957 160,000 lb/hr Bagho use DC 3 004P116 -- Ore Bucket - Line 2B 1957 160,000 lb/hr Bagho use DC 4 004P213 -- Ore Bucket - Line 3A 1957 120,000 lb/hr Bagho use DC 5 004P214 -- Ore Bucket - Line 3B 1957 120,000 lb/hr Bagho use DC 6 004P215 -- Ore Bucket - Line 4A 1957 120,000 lb/hr Bagho use DC 7 004P216 -- Ore Bucket - Line 4B 1957 120,000 lb/hr Bagho use DC 8 STORAGE TANKS Emission Unit ID Emission Unit Description Orientatio n Capacity Tank Contents Tank IEU-1 Gas station in parking lot (south) Horizon tal 10,000 gal Diesel Tank IEU-2 Gas station in parking lot (north) Horizon tal 4,000 gal Kerosene Tank IEU-3 Maintenance parking lot (south) Horizontal 550 gal Gasoline Tank IEU-4 Near south cooling tower (boiler house) Ve rtical 15,000 gal Diesel Tank IEU-5 Outside of bath processing Horizontal 4,00 0 gal Diesel Tank IEU-6 Maintenance parking lot (south) Horizontal 550 gal Diesel Tank IEU-7 Outside potrooms west passage (south) 4B H orizontal 2,000 gal DieselTitle V Operating Permit R30-03500002-2010 Page 13 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 1.2. Active R13, R14, and R19 Permits The underlying authority for any conditions from R1 3, R14, and/or R19 permits contained in this operating permit is cited using the original permit number (e.g. R13-12 34). The current applicable version of such permit (s) is listed below.

Permit Number Date of Issuance R13-0348 December 23, 1977 R13-201R June 10, 1997 R13-2140A August 29, 2003 R13-2431A March 17, 2009Title V Operating Permit R30-03500002-2010 Page 14 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 2.0. General Conditions 2.1. Definitions 2.1.1. All references to the "West Virginia Air Poll ution Control Act" or the "Air Pollution Control Ac t" mean those provisions contained in W.Va. Code §§ 22-5-1 to 22- 5-18. 2.1.2. The "Clean Air Act" means those provisions co ntained in 42 U.S.C. §§ 7401 to 7671q, and regulati ons promulgated thereunder. 2.1.3. "Secretary" means the Secretary of the Department of Environmental Protection or such other pers on to whom the Secretary has delegated authority or duties pur suant to W.Va. Code §§ 22-1-6 or 22-1-8 (45CSR§30-2 .12.). The Director of the Division of Air Quality is the Secretary's designated representative for the purpo ses of this permit. 2.1.4. Unless otherwise specified in a permit condit ion or underlying rule or regulation, all reference s to a “rolling yearly total” shall mean the sum of the monthly dat a, values or parameters being measured, monitored, or recorded, at any given time for the previous twelve (12) consecutive calendar months 

### 2.2. Acronyms

CAAA Clean Air Act Amendments CBI Confidential Business Information CEM Continuous Emission Monitor CES Certified Emission Statement C.F.R. or CFR Code of Federal Regulations CO Carbon Monoxide C.S.R. or CSR Codes of State Rules DAQ Division of Air Quality DEP Department of Environmental

Protection FOIA Freedom of Information Act HAP Hazardous Air Pollutant HON Hazardous Organic NESHAP HP Horsepower lbs/hr Pounds per Hour LDAR Leak Detection and Repair m Thousand MACT Maximum Achievable Control

Technology mm Million mmBtu/hr Million British Thermal Units per

Hour mmft 3/hr Million Cubic Feet Burned per

Hour NA or N/A Not Applicable NAAQS National Ambient Air Quality

Standards NESHAPS National Emissions Standards for Hazardous Air Pollutants NO x Nitrogen Oxides NSPS New Source Performance

Standards PM Particulate Matter PM 10 Particulate Matter less than

10μm in diameter pph Pounds per Hour ppm Parts per Million PSD Prevention of Significant

Deterioration psi Pounds per Square Inch SIC Standard Industrial

Classification SIP State Implementation Plan SO 2 Sulfur Dioxide TAP Toxic Air Pollutant TPY Tons per Year TRS Total Reduced Sulfur TSP Total Suspended Particulate USEPA United States Environmental

Protection Agency UTM Universal Transverse Mercator VEE Visual Emissions Evaluation VOC Volatile Organic CompoundsTitle V Operating Permit R30-03500002-2010 Page 15 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 2.3. Permit Expiration and Renewal 2.3.1. Permit duration. This permit is issued for afixed term of five (5) years and shall expire on the date specified on the cover of this permit, except as provided in 45CSR§30-6.3.b. and 45CSR§30-6.3.c. [45CSR§30-5.1.b.] 2.3.2. A permit renewal application is timely if it is submitted at least six (6) months prior to the d ate of permit expiration. [45CSR§30-4.1.a.3.] 2.3.3. Permit expiration terminates the source's rig ht to operate unless a timely and complete renewal application has been submitted consistent with 45CSR§30-6.2. and 45 CSR§30-4.1.a.3. [45CSR§30-6.3.b.] 2.3.4. If the Secretary fails to take final action t o deny or approve a timely and complete permit appl ication before the end of the term of the previous permit, the permit shall not expire until the renewal permit has been issued or denied, and any permit shield granted for the permi t shall continue in effect during that time. [45CSR§30-6.3.c.] 

### 2.4. Permit Actions 2.4.1. This permit may be modified, revoked, reopene d and reissued, or terminated for cause. The filin g of a request by the permittee for a permit modification, revocation and reissuance, or termination, or of a notific ation of planned changes or anticipated noncompliance does n ot stay any permit condition. [45CSR§30-5.1.f.3.] 

### 2.5. Reopening for Cause 2.5.1. This permit shall be reopened and revised und er any of the following circumstances: a. Additional applicable requirements under the Clea n Air Act or the Secretary's legislative rules beco me applicable to a major source with a remaining permi t term of three (3) or more years. Such a reopenin g shall be completed not later than eighteen (18) mon ths after promulgation of the applicable requiremen t. No such reopening is required if the effective date of the requirement is later than the date on whichthe permit is due to expire, unless the original permit or any of its terms and conditions has been extend ed pursuant to 45CSR§§30-6.6.a.1.A. or B. b. Additional requirements (including excess emissio ns requirements) become applicable to an affected source under Title IV of the Clean Air Act (Acid De position Control) or other legislative rules of the Secretary. Upon approval by U.S. EPA, excess emiss ions offset plans shall be incorporated into the pe rmit. c. The Secretary or U.S. EPA determines that the permit contains a material mistake or that inaccurate statements were made in establishing the emissions standards or other terms or conditions of the permi t. d. The Secretary or U.S. EPA determines that the permit must be revised or revoked and reissued to assu re compliance with the applicable requirements. [45CSR§30-6.6.a.]Title V Operating Permit R30-03500002-2010 Page 16 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 2.6. Administrative Permit Amendments 2.6.1. The permittee may request an administrative p ermit amendment as defined in and according to the procedures specified in 45CSR§30-6.4. [45CSR§30-6.4.] 

### 2.7. Minor Permit Modifications 2.7.1. The permittee may request a minor permit modi fication as defined in and according to the procedu res specified in 45CSR§30-6.5.a. [45CSR§30-6.5.a.] 

### 2.8. Significant Permit Modification 2.8.1. The permittee may request a significant permi t modification, in accordance with 45CSR§30-6.5.b., for permit modifications that do not qualify for minor permit modifications or as administrative amendments. [45CSR§30-6.5.b.] 

### 2.9. Emissions Trading 2.9.1. No permit revision shall be required, under a ny approved economic incentives, marketable permits , emissions trading, and other similar programs or processes fo r changes that are provided for in the permit and that are in accordance with all applicable requirements. [45CSR§30-5.1.h.] 

### 2.10. Off-Permit Changes 2.10.1. Except as provided below, a facility may make any change in its operations or emissions that is not addressed nor prohibited in its permit and which is not consi dered to be construction nor modification under anyrule promulgated by the Secretary without obtaining an a mendment or modification of its permit. Such chang es shall be subject to the following requirements and restrictions: a. The change must meet all applicable requirements and may not violate any existing permit term or condition. b. The permittee must provide a written notice of th e change to the Secretary and to U.S. EPA within tw o (2) business days following the date of the change. Su ch written notice shall describe each such change, including the date, any change in emissions, pollut ants emitted, and any applicable requirement that w ould apply as a result of the change. c. The change shall not qualify for the permit shiel d. d. The permittee shall keep records describing all c hanges made at the source that result in emissions of regulated air pollutants, but not otherwise regulat ed under the permit, and the emissions resulting fr om those changes. e. No permittee may make any change subject to any r equirement under Title IV of the Clean Air Act (Aci d Deposition Control) pursuant to the provisions of 4 5CSR§30-5.9.Title V Operating Permit R30-03500002-2010 Page 17 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 f. No permittee may make any changes which would req uire preconstruction review under any provision of Title I of the Clean Air Act (including 45CSR14 and45CSR19) pursuant to the provisions of 45CSR§30- 5.9. [45CSR§30-5.9] 

### 2.11. Operational Flexibility 2.11.1. The permittee may make changes within the fa cility as provided by § 502(b)(10) of the Clean AirAct. Such operational flexibility shall be provided in the pe rmit in conformance with the permit application andapplicable requirements. No such changes shall be a modification under any rule or any provision of Title I of the Clean Air Act (including 45CSR14 and 45CSR19) promulgatedby the Secretary in accordance with Title I of the Clean Air Act and the change shall not result in a level of emissions exceeding the emissions allowabl e under the permit. [45CSR§30-5.8] 2.11.2. Before making a change under 45CSR§30-5.8., the permittee shall provide advance written notice to the Secretary and to U.S. EPA, describing the change to be made, the date on which the change will occur, any changes in emissions, and any permit terms and cond itions that are affected. The permittee shall ther eafter maintain a copy of the notice with the permit, and the Secretary shall place a copy with the permit inthe public file. The written notice shall be provided to the Secretary and U.S. EPA at least seven (7) days prio r to the date that the change is to be made, except that this period may be shortened or eliminated as necessary fora change that must be implemented more quickly to address un anticipated conditions posing a significant health, safety, or environmental hazard. If less than seven (7) days notice is provided because of a need to respond more quickly to such unanticipated conditions, the permi ttee shall provide notice to the Secretary and U.S. EPA as soon as possible after learning of the need to make the change. [45CSR§30-5.8.a.] 2.11.3. The permit shield shall not apply to changes made under 45CSR§30-5.8., except those provided fo r in 45CSR§30-5.8.d. However, the protection of the permit shield will continue to apply to operations and emissions that are not affected by the change, prov ided that the permittee complies with the terms and conditions of the permit applicable to such operati ons and emissions. The permit shield may be reinst ated for emissions and operations affected by the change: a. If subsequent changes cause the facility's operations and emissions to revert to those authorized i n the permit and the permittee resumes compliance with th e terms and conditions of the permit, or b. If the permittee obtains final approval of a sign ificant modification to the permit to incorporate the change in the permit. [45CSR§30-5.8.c.] 2.11.4. "Section 502(b)(10) changes" are changes that contravene an express permit term. Such changes do not include changes that would violate applicable requirements or contravene enforceable permit terms and conditio ns that are monitoring (including test methods), recordkeep ing, reporting, or compliance certification require ments. [45CSR§30-2.39] 

### 2.12. Reasonably Anticipated Operating Scenarios 2.12.1. The following are terms and conditions for r easonably anticipated operating scenarios identifie d in this permit.Title V Operating Permit R30-03500002-2010 Page 18 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 a. Contemporaneously with making a change from one o perating scenario to another, the permittee shall record in a log at the permitted facility a record of the scenario under which it is operating and to document the change in reports submitted pursuant to the terms of this permit and 45CSR30. b. The permit shield shall extend to all terms and c onditions under each such operating scenario; and c. The terms and conditions of each such alternative scenario shall meet all applicable requirements an d the requirements of 45CSR30. [45CSR§30-5.1.i.] 

### 2.13. Duty to Comply 2.13.1. The permittee must comply with all condition s of this permit. Any permit noncompliance constitutes a violation of the West Virginia Code and the Clean Air Act andis grounds for enforcement action by the Secretaryor USEPA; for permit termination, revocation and reiss uance, or modification; or for denial of a permit r enewal application. [45CSR§30-5.1.f.1.] 

### 2.14. Inspection and Entry 2.14.1. The permittee shall allow any authorized rep resentative of the Secretary, upon the presentationof credentials and other documents as may be required by law, to p erform the following: a. At all reasonable times (including all times in which the facility is in operation) enter upon the p ermittee's premises where a source is located or emissions rel ated activity is conducted, or where records must b e kept under the conditions of this permit; b. Have access to and copy, at reasonable times, anyrecords that must be kept under the conditions of this permit; c. Inspect at reasonable times (including all times in which the facility is in operation) any faciliti es, equipment (including monitoring and air pollution c ontrol equipment), practices, or operations regulat ed or required under the permit; d. Sample or monitor at reasonable times substances or parameters to determine compliance with the perm it or applicable requirements or ascertain the amounts and types of air pollutants discharged. [45CSR§30-5.3.b.] 

### 2.15. Schedule of Compliance 2.15.1. For sources subject to a compliance schedule , certified progress reports shall be submitted con sistent with the applicable schedule of compliance set forth in this permit and 45CSR§30-4.3.h., but at least every six(6) months, and no greater than once a month, and shall include the following: a. Dates for achieving the activities, milestones, o r compliance required in the schedule of compliance , and dates when such activities, milestones or complianc e were achieved; andTitle V Operating Permit R30-03500002-2010 Page 19 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 b. An explanation of why any dates in the schedule o f compliance were not or will not be met, and any preventative or corrective measure adopted. [45CSR§30-5.3.d.] 

### 2.16. Need to Halt or Reduce Activity not a Defense 2.16.1. It shall not be a defense for a permittee inan enforcement action that it would have been nece ssary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this permit. How ever, nothing in this paragraph shall be construed as pre cluding consideration of a need to halt or reduce a ctivity as a mitigating factor in determining penalties for no ncompliance if the health, safety, or environmental impacts of halting or reducing operations would be more serious than the impacts of continued operations. [45CSR§30-5.1.f.2.] 

### 2.17. Emergency 2.17.1. An "emergency" means any situation arising f rom sudden and reasonably unforeseeable events beyo nd the control of the source, including acts of God, whichsituation requires immediate corrective action to restore normal operation, and that causes the source to exc eed a technology-based emission limitation under th e permit, due to unavoidable increases in emissions attributable to the emergency. An emergency shall not inclu de noncompliance to the extent caused by improperly de signed equipment, lack of preventative maintenance, careless or improper operation, or operator error. [45CSR§30-5.7.a.] 2.17.2. Effect of any emergency. An emergency constitutes an affirmative defense to an action brought for noncompliance with such technology-based emission l imitations if the conditions of 45CSR§30-5.7.c. are met. [45CSR§30-5.7.b.] 2.17.3. The affirmative defense of emergency shall b e demonstrated through properly signed, contemporan eous operating logs, or other relevant evidence that: a. An emergency occurred and that the permittee can identify the cause(s) of the emergency; b. The permitted facility was at the time being prop erly operated; c. During the period of the emergency the permittee took all reasonable steps to minimize levels of emi ssions that exceeded the emission standards, or other requ irements in the permit; and d. Subject to the requirements of 45CSR§30-5.1.c.3.C .1, the permittee submitted notice of the emergencyto the Secretary within one (1) working day of the time when emission limitations were exceeded due to th e emergency and made a request for variance, and as applicable rules provide. This notice, report, and variance request fulfills the requirement of 45CSR§ 30-5.1.c.3.B. This notice must contain a detailed description of the emergency, any steps taken to mi tigate emissions, and corrective actions taken. [45CSR§30-5.7.c.] 2.17.4. In any enforcement proceeding, the permittee seeking to establish the occurrence of an emergenc y has the burden of proof. [45CSR§30-5.7.d.]Title V Operating Permit R30-03500002-2010 Page 20 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 2.17.5. This provision is in addition to any emergen cy or upset provision contained in any applicable r equirement. [45CSR§30-5.7.e.] 

### 2.18. Federally-Enforceable Requirements 2.18.1. All terms and conditions in this permit, inc luding any provisions designed to limit a source's potential to emit and excepting those provisions that are specificall y designated in the permit as "State-enforceable on ly", are enforceable by the Secretary, USEPA, and citizens u nder the Clean Air Act. [45CSR§30-5.2.a.] 2.18.2. Those provisions specifically designated in the permit as "State-enforceable only" shall become "Federallyenforceable" requirements upon SIP approval by the USEPA. 

### 2.19. Duty to Provide Information 2.19.1. The permittee shall furnish to the Secretarywithin a reasonable time any information the Secre tary may request in writing to determine whether cause exists for mo difying, revoking and reissuing, or terminating the permit or to determine compliance with the permit. Upon r equest, the permittee shall also furnish to the Sec retary copies of records required to be kept by the permittee. For information claimed to be confidential, the permittee shall furnish such records to the Secretary along w ith a claim of confidentiality in accordance with 4 5CSR31. If confidential information is to be sent to USEPA, the permittee shall directly provide such information to USEPA along with a claim of confidentiality in acco rdance with 40 C.F.R. Part 2. [45CSR§30-5.1.f.5.] 

### 2.20. Duty to Supplement and Correct Information 2.20.1. Upon becoming aware of a failure to submit a ny relevant facts or a submittal of incorrect information in any permit application, the permittee shall promptly submit to the Secretary such supplemental facts or co rrected information. [45CSR§30-4.2.] 

### 2.21. Permit Shield 2.21.1. Compliance with the conditions of this permi t shall be deemed compliance with any applicable re quirements as of the date of permit issuance provided that suc h applicable requirements are included and are spec ifically identified in this permit or the Secretary has dete rmined that other requirements specifically identif ied are not applicable to the source and this permit includes s uch a determination or a concise summary thereof. [45CSR§30-5.6.a.] 2.21.2. Nothing in this permit shall alter or affect the following: a. The liability of an owner or operator of a source for any violation of applicable requirements priorto or at the time of permit issuance; or b. The applicable requirements of the Code of West V irginia and Title IV of the Clean Air Act (Acid Deposition Control), consistent with § 408 (a) of the Clean Air Act.Title V Operating Permit R30-03500002-2010 Page 21 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 c. The authority of the Administrator of U.S. EPA to require information under § 114 of the Clean Air A ct or to issue emergency orders under § 303 of the Cle an Air Act. [45CSR§30-5.6.c.] 

### 2.22. Credible Evidence 2.22.1. Nothing in this permit shall alter or affect the ability of any person to establish compliance with, or a violation of, any applicable requirement through the use of c redible evidence to the extent authorized by law. Nothing in this permit shall be construed to waive any defe nses otherwise available to the permittee including but not limited to any challenge to the credible evidence rule in the context of any future proceeding. [45CSR§30-5.3.e.3.B. and 45CSR38] 

### 2.23. Severability 2.23.1. The provisions of this permit are severable. If any provision of this permit, or the applicati on of any provision of this permit to any circumstance is held invalid by a court of competent jurisdiction, the remaining permit terms and conditions or their application to other circumstances shall remain in full force and effect

. [45CSR§30-5.1.e.] 

### 2.24. Property Rights 2.24.1. This permit does not convey any property rig hts of any sort or any exclusive privilege. [45CSR§30-5.1.f.4] 

### 2.25. Acid Deposition Control 2.25.1. Emissions shall not exceed any allowances th at the source lawfully holds under Title IV of the Clean Air Act (Acid Deposition Control) or rules of the Secretarypromulgated thereunder. a. No permit revision shall be required for increase s in emissions that are authorized by allowances ac quired pursuant to the acid deposition control program, pr ovided that such increases do not require a permit revision under any other applicable requirement. b. No limit shall be placed on the number of allowan ces held by the source. The source may not, howeve r, use allowances as a defense to noncompliance with a ny other applicable requirement. c. Any such allowance shall be accounted for accordi ng to the procedures established in rules promulgat ed under Title IV of the Clean Air Act. [45CSR§30-5.1.d.] 2.25.2. Where applicable requirements of the Clean A ir Act are more stringent than any applicable requi rement of regulations promulgated under Title IV of the CleanAir Act (Acid Deposition Control), both provisions shall be incorporated into the permit and shall be enforc eable by the Secretary and U. S. EPA. [45CSR§30-5.1.a.2.]Title V Operating Permit R30-03500002-2010 Page 22 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 3.0. Facility-Wide Requirements 3.1. Limitations and Standards

3.1.1. Open burning. The open burning of refuse by any person is prohi bited except as noted in 45CSR§6-3.1. [45CSR§6-3.1.]

3.1.2. Open burning exemptions. The exemptions listed in 45CSR§6-3.1 are subject to the following stipulation: Upon notification by the Secretary, no person shall cause or allow any form of open burning during exi sting or predicted periods of atmospheric stagnation. No tification shall be made by such means as the Secre tary may deem necessary and feasible. [45CSR§6-3.2.]

3.1.3. Asbestos. The permittee is responsible for thoroughly inspe cting the facility, or part of the facility, prior to commencement of demolition or renovation for the pr esence of asbestos and complying with 40 C.F.R. § 61.145, 40 C.F.R. § 61.148, and 40 C.F.R. § 61.150. The permittee must notify the Secretary at least t en (10) working days prior to the commencement of any asbes tos removal on the forms prescribed by the Secretary if the permittee is subject to the notification requir ements of 40 C.F.R. § 61.145(b)(3)(i). The USEPA, the Division of Waste Management and the Bureau for Pub lic Health - Environmental Health require a copy of this notice to be sent to them. [40 C.F.R. 61 and 45CSR34]

3.1.4. Odor. No person shall cause, suffer, allow or permit th e discharge of air pollutants which cause or contri bute to an objectionable odor at any location occupied b y the public. [45CSR§4-3.1 State-Enforceable only.]

3.1.5. Standby plan for reducing emissions. When requested by the Secretary, the permittee sh all prepare standby plans for reducing the emissions of air pollutants in accordance with the objectives set forth in Tabl es I, II, and III of 45CSR11. [45CSR§11-5.2]

3.1.6. Emission inventory. The permittee is responsible for submitting, on a n annual basis, an emission inventory in accordance with the submittal requirements of th e Division of Air Quality. [W.Va. Code § 22-5-4(a)(14)]

3.1.7. Ozone-depleting substances. For those facilities performing maintenance, serv ice, repair or disposal of appliances, the permittee shall comply with the sta ndards for recycling and emissions reduction pursua nt to 40 C.F.R. Part 82, Subpart F, except as provided for M otor Vehicle Air Conditioners (MVACs) in Subpart B: a. Persons opening appliances for maintenance, servi ce, repair, or disposal must comply with the prohib itions and required practices pursuant to 40 C.F.R. §§ 82. 154 and 82.156. b. Equipment used during the maintenance, service, r epair, or disposal of appliances must comply with the standards for recycling and recovery equipment purs uant to 40 C.F.R. § 82.158. c. Persons performing maintenance, service, repair, or disposal of appliances must be certified by an approved technician certification program pursuant to 40 C.F .R. § 82.161. [40 C.F.R. 82, Subpart F]Title V Operating Permit R30-03500002-2010 Page 23 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 3.1.8. Risk Management Plan. Should this stationary source, as defined in 40 C .F.R. § 68.3, become subject to Part 68, then the owner or operator shall submit a risk management plan (RMP) by the date specified in 40 C .F.R. § 68.10 and shall certify compliance with the requi rements of Part 68 as part of the annual compliance certification as required by 40 C.F.R. Part 70 or 7 1. [40 C.F.R. 68] 3.1.9. The owner or operator of a plant shall mainta in particulate matter control of the plant premises , and plant owned, leased or controlled access roads, by paving , application of asphalt, chemical dust suppressant s or other suitable dust control measures. Good operating pra ctices shall be implemented and when necessary particulate matter suppressants shall be applied in relation to stockpiling and general material handling to minim ize particulate matter generation and atmospheric entra inment. [45CSR§7-5.2.] 3.1.10 Due to unavoidable malfunction of equipment, emissions exceeding those provided for in 45CSR7 may be permitted by the Director for periods not to exceedten (10) days upon specific application to the Dir ector. Such application shall be made within twenty-four (24) h ours of the malfunction. In cases of major equipme nt failure, additional time periods may be granted by the Director provided a corrective program has been submitted by the owner or operator and approved by the Director. [45CSR§7-9.1.] 3.1.11 Any stack serving any process source operatio n or air pollution control equipment on any process source operation shall contain flow straightening devices or a vertical run of sufficient length to establishflow patterns consistent with acceptable stack sampling procedure s. [45CSR§7-4.12.] 

### 3.2. Monitoring Requirements 3.2.1. Visible emission checks of each emission poin t subject to an opacity limit shall be conducted on ce per week during periods of normal facility operation using 4 0 C.F.R. 60 Appendix A, Method 22. If during these checks, or at any other time, visible emissions are observe d at any emission point, compliance shall be determ ined by conducting tests in accordance 45CSR7A within 48 ho urs. If the 45CSR7A test results show the opacity to be equal to or greater than the limit, then an evaluation to determine the cause of the exceedance shall be conducted within three (3) days, unless the cause of the exce edance is corrected within 24 hours. If no visible emissions are observed after two weeks, visible emission chec ks shall be conducted monthly. If any visible emis sions are observed during the monthly emission checks, visibl e emission checks shall return to being performed w eekly. If no visible emissions are observed after four mon ths, visible emission checks shall be conducted eac h calendar quarter. If any visible emissions are observed during the quarterly emission checks, visible emissionchecks shall return to being performed each calendar month . Records shall be maintained on site and shall in clude all data required by 40 C.F.R. 60 Appendix A, Method 22 or 45CSR7A test, whichever is appropriate. These records shall include, at a minimum, the date and time of each visible emission check, the visible emi ssions survey results and, if appropriate, all corrective actions taken. For sources that are controlled by fabric filtratio n, the Method 22 or 45CSR7A test readings shall be taken at the exhaust point for the associated control device . For sources controlled by other means but withou t a defined stack emission point, the Method 22 or 45CSR7A test readings shall be taken at the source. For source s located within an enclosed building, the Method 22 or 45CSR 7A test readings shall be taken at each visible sid e and the roof of the building. [45CSR§30-5.1.c.]Title V Operating Permit R30-03500002-2010 Page 24 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 3.3. Testing Requirements

3.3.1. Stack testing. As per provisions set forth in this permit or as otherwise required by the Secretary, in accordance with the West Virginia Code, underlying regulations, permits and orders, the permittee shal l conduct test(s) to determine compliance with the emission l imitations set forth in this permit and/or establis hed or set forth in underlying documents. The Secretary, or h is duly authorized representative, may at his optio n witness or conduct such test(s). Should the Secretary exer cise his option to conduct such test(s), the operat or shall provide all necessary sampling connections and samp ling ports to be located in such manner as the Secr etary may require, power for test equipment and the requi red safety equipment, such as scaffolding, railings and ladders, to comply with generally accepted good saf ety practices. Such tests shall be conducted in acc ordance with the methods and procedures set forth in this p ermit or as otherwise approved or specified by the Secretary in accordance with the following: a. The Secretary may on a source-specific basis appr ove or specify additional testing or alternative te sting to the test methods specified in the permit for demonstrating compliance with 40 C.F.R. Parts 60, 61, and 63, if applicable, in accordance with the Secretary ’s delegated authority and any established equivale ncy determination methods which are applicable. b. The Secretary may on a source-specific basis appr ove or specify additional testing or alternative te sting to the test methods specified in the permit for demonstrating compliance with applicable requirements which do not involve federal delegation. In specif ying or approving such alternative testing to the t est methods, the Secretary, to the extent possible, sha ll utilize the same equivalency criteria as would b e used in approving such changes under Section 3.3.1.a. of this permit. c. All periodic tests to determine mass emission lim its from or air pollutant concentrations in dischar ge stacks and such other tests as specified in this permit sh all be conducted in accordance with an approved tes t protocol. Unless previously approved, such protoco ls shall be submitted to the Secretary in writing at least thirty (30) days prior to any testing and shall con tain the information set forth by the Secretary. Inaddition, the permittee shall notify the Secretary at least f ifteen (15) days prior to any testing so the Secret ary may have the opportunity to observe such tests. This n otification shall include the actual date and time during which the test will be conducted and, if appropriat e, verification that the tests will fully conform t o a referenced protocol previously approved by the Secr etary. [WV Code § 22-5-4(a)(15), 45CSR§§7-8.1 and 8.2., an d 45CSR§13-6.1.] 

### 3.4. Recordkeeping Requirements

3.4.1. Monitoring information. The permittee shall keep records of monitoring in formation that include the following: a. The date, place as defined in this permit and time of sampling or measurements; b. The date(s) analyses were performed; c. The company or entity that performed the analyses ; d. The analytical techniques or methods used; e. The results of the analyses; and f. The operating conditions existing at the time of sampling or measurement. [45CSR§30-5.1.c.2.A. and 45CSR13 - R13-2431, Condit ion 4.3.1.]Title V Operating Permit R30-03500002-2010 Page 25 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 3.4.2. Retention of records. The permittee shall retain records of all require d monitoring data and support information for a period of at least five (5) years from the date of monitoring sample, measurement, r eport, application, or record creation date. Support info rmation includes all calibration and maintenance re cords and all original strip-chart recordings for continuous monitoring instrumentation, and copies of all reports required by the permit. Where appropriate, records may be m aintained in computerized form in lieu of the above records. [45CSR§30-5.1.c.2.B.]

3.4.3. Odors. For the purposes of 45CSR4, the permittee shall m aintain a record of all odor complaints received, any investigation performed in response to such a c omplaint, and any responsive action(s) taken. [45CSR§30-5.1.c. State-Enforceable only.] 

### 3.5. Reporting Requirements

3.5.1. Responsible official. Any application form, report, or compliance certi fication required by this permit to be submitted to the DAQ and/or USEPA shall contain a c ertification by the responsible official that state s that, based on information and belief formed after reason able inquiry, the statements and information in the document are true, accurate and complete. [45CSR§30-4.4. and

5.1.c.3.D.] 3.5.2. A permittee may request confidential treatmen t for the submission of reporting required under 45 CSR§30- 5.1.c.3. pursuant to the limitations and procedures of W.Va. Code § 22-5-10 and 45CSR31. [45CSR§30-5.1.c.3.E.] 3.5.3. Except for the electronic submittal of the an nual certification to the USEPA as required in 3.5. 5 below, all notices, requests, demands, submissions and other c ommunications required or permitted to be made to the Secretary of DEP and/or USEPA shall be made in writing and shall be deemed to have been duly given whe n delivered by hand, mailed first class, or by privat e carrier with postage prepaid to the address(es) s et forth below or to such other person or address as the Secretaryof the Department of Environmental Protection may designate: 

### If to the DAQ: If to the US EPA: Director WVDEP Division of Air Quality 601 57th Street SE Charleston, WV 25304 Phone: 304/926-0475 FAX: 304/926-0478 Associate Director Office of Enforcement and Permits Review (3AP12) U. S. Environmental Protection Agency Region III 1650 Arch Street Philadelphia, PA 19103-2029

3.5.4. Certified emissions statement. The permittee shall submit a certified emissions statement and pay fees on an annual basis in accordance with the submittal requi rements of the Division of Air Quality. [45CSR§30-8.]

3.5.5. Compliance certification. The permittee shall certify compliance with the c onditions of this permit on the forms provided by the DAQ. In addition to the annu al compliance certification, the permittee may be r equiredTitle V Operating Permit R30-03500002-2010 Page 26 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 to submit certifications more frequently under an applicable requirement of this permit. The annual c ertification shall be submitted to the DAQ and USEPA on or befor e March 15 of each year, and shall certify complian ce for the period ending December 31. The annual cert ification to the USEPA shall be submitted in electr onic format only. It shall be submitted by e-mail to th e following address: R3_APD_Permits@epa.gov. The permittee shall maintain a copy of the certificatio n on site for five (5) years from submittal of the certification. [45CSR§30-5.3.e.]

3.5.6. Semi-annual monitoring reports. The permittee shall submit reports of any require d monitoring on or before September 15 for the reporting period January 1 to June 30 and on or before March 15 for the reporting period July 1 to December 31. All instances of deviation from permit requirements must be clearly identifiedin such reports. All required reports must be certified bya responsible official consistent with 45CSR§30-4. 4. [45CSR§30-5.1.c.3.A.]

3.5.7. Emergencies. For reporting emergency situations, refer to Section 2.17 of this permit.

3.5.8. Deviations. a. In addition to monitoring reports required by thi s permit, the permittee shall promptly submit suppl emental reports and notices in accordance with the followin g: 1. Any deviation resulting from an emergency or upse t condition, as defined in 45CSR§30-5.7., shall be reported by telephone or telefax within one (1) working day of the date on which the permittee becomes aware of the deviation, if the permittee de sires to assert the affirmative defense in accordan ce with 45CSR§30-5.7. A written report of such deviation, which shall include the probable cause of such deviations, and any corrective actions or prev entative measures taken, shall be submitted and certified by a responsible official within ten (10) days of the deviation. 2. Any deviation that poses an imminent and substantial danger to public health, safety, or the environment shall be reported to the Secretary imme diately by telephone or telefax. A written report of such deviation, which shall include the probable cause of such deviation, and any corrective action s or preventative measures taken, shall be submitted by the responsible official within ten (10) days of the deviation. 3. Deviations for which more frequent reporting is r equired under this permit shall be reported on the more frequent basis. 4. All reports of deviations shall identify the prob able cause of the deviation and any corrective acti ons or preventative measures taken. [45CSR§30-5.1.c.3.C.] b. The permittee shall, in the reporting of deviatio ns from permit requirements, including those attrib utable to upset conditions as defined in this permit, repo rt the probable cause of such deviations and any corrective actions or preventive measures taken in accordance with any rules of the Secretary. [45CSR§30-5.1.c.3.B.] 3.5.9. New applicable requirements. If any applicable requirement is promulgated duri ng the term of this permit, the permittee will meet such requirements on a time ly basis, or in accordance with a more detailed sch edule if required by the applicable requirement. [45CSR§30-4.3.h.1.B.]Title V Operating Permit R30-03500002-2010 Page 27 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 3.6. Compliance Plan

3.6.1. None. 

### 3.7. Permit Shield 3.7.1. The permittee is hereby granted a permit shie ld in accordance with 45CSR§30-5.6. The permit shi eld applies provided the permittee operates in accordance with the information contained within this permit. 3.7.2. The following requirements specifically identified are not applicable to the source based on the determinations set forth below. The permit shield shall apply to the following requirements provided the conditions of the determinations are met. a. 45CSR5 - The facility is exempt from this rule inaccordance with Section 2.4.a., a facility that is designed to process less than two hundred (200) tons of coal per day; and Section 2.4.b., a facility subject to the requirements of 45CSR2, 45CSR3, 45CSR7. b. 40 C.F.R. Part 60 subparts K, Ka, Kb - The facili ty does not have any tanks that store volatile orga nic liquids with a capacity greater than 65,000 gallons (Subpart K), 40,000 gallons (Subpart Ka), or 19,81 3 gallons (Subpart Kb). c. 40 C.F.R. Part 60 Subpart Y - The provisions of this subpart are not applicable because the facilitydoes not process more than 181 Mg (200 tons) of coal perday. d. 40 C.F.R. Part 64 - Compliance Assurance Monitori ng - In accordance with 40 C.F.R.§ 64.2(a)(3), the following emission units have potential pre-control device emissions of the applicable regulated air pollutant required to be classified as a major sour ce: Emission Unit ID Description Pollutant Reason for exemption

002P301B Bucket Elevator S-1. Screws K12, K-13, K-14 PM No control device [40 C.F.R. §64.2(a)(2)] 003P019 Building No. 52 Ring Furnace SO 2 No SO 2 control device [40 C.F.R. §64.2(a)(2)] 003P110 Building No. 53 Ring Furnace SO 2 004P101-004P104 Reduction Cells Potroom 1A, 1B,

2A, and 2B CO No CO control device [40 C.F.R. §64.2(a)(2)] 004P201-004P204 Reduction Cells Potroom 3A, 3B,

4A, and 4B CO

004P101-004P104 Reduction Cells Potroom 1A, 1B,

2A, and 2B Total Fluorides Subject to 40 C.F.R. Part 63, Subpart

LL. Exempt in accordance with 40 C.F.R. § 64.2(b)(1)(i). 004P201-004P204 Reduction Cells Potroom 3A, 3B,

4A, and 4B Total FluoridesTitle V Operating Permit R30-03500002-2010 Page 28 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 4.0. Manufacturing Process Group Requirements: Group A [Barge Unloading], Group B [Material Transf er to/from Potroom Silos], Group C [Bath Processing], Group D [Anode Mix, Press & Prep], Group E [Cathode Paste], Group F [Coal & Coke Unloading], a nd Group G [Anode Blocks] 

### 4.1. Limitations and Standards 4.1.1. No person shall cause, suffer, allow, or perm it PM to be vented into the open air from any type source operation or duplicate source operation, or from all air poll ution control equipment installed on any type sourc e operation or duplicate source operation in excess of the quan tities specified in this permit.

Emission Unit ID Equipment Description Max. AllowablePM Emission Limit (lb/hr) Group A - Barge Unloading 001P101, 001P101A Vacuum Truck Unloading/AIF 3 - Cryolite Railcar Unloading and Conveyor 46.0 001P111 Conveyor 2 43.6 Group B - Material Transfer to/from Potroom Silos

001P201 Air Slides 372, 470, 473, 404, 472, 405, & 474; Air Lifts 374 & 471; Disengaging Bins 374 & 471 28.0

001P202 Air Slides 302, 400, & 403; Air Lifts 304 & 401; Di sengaging Bins 304 & 401 28.0

001P203 Air Slides 021& 025, Air Lifts 022 & 250; & Disenga ging Bins 022 & 250 32.2 001P204 Parallel Vibrating Screens 004 & 014 and Tot e, Air Slide 102 32.2 001P206 Air Slide 172, Air Lift 174, Disengaging Bin 174 32.2 004P217 Fill Station 16.0 004P218 Bath Cart 16.0 004P219 Apollo Fill Station 28.0 004P301 Air Slides 270, 271, 277 28.0 004P302 Air Slides 200, 207 28.0 004P303 Air Slides 370, 371 28.0 004P304 Air Slides 300, 301 28.0 004P305 Air Slides 264, 303 28.0 Group C - Bath Processing 001P305 Cascade Mill 156-200 19.96 001P306 Magnetic Separator 156-214 19.96 001P307 and 001P308 Skip Buckets 16.0 eachTitle V Operating Permit R30-03500002-2010 Page 29 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Equipment Description Max. AllowablePM Emission Limit (lb/hr)

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 001P309 Vibrating Screen 156.-203 19.96 001P311 Bagging Machine 156-501 19.96 001P315 Skip Hoist 16.0 001P312 Cyclone 156-206, Air Lifts 156-304 & 156-309 , Disengaging Bins 156-305 & 156-310 19.96

Group E - Cathode Paste 002P201 Vibrating Screening/Sizing 28.0 002P202 Conveyor K-10 28.0 002P203 Roll Crusher M-7 28.0 002P205 Fine Grind Mill D-2 28.0 002P206 Conveyor K-11 28.0 002P207 Air Classifier G-2 28.0 002P208 Cyclone P-2 28.0 002P214 Weigh Larry 28.0 002P215 Batch Mixer AF-17 28.0 002P216 Batch Mixer AF-18 28.0 002P218 Press Reject Conveyor 28.0 002P220 Roll Crusher M-5C 28.0 002P221 Roll Crusher M-5B 28.0 Group F - Coal & Coke Unloading 002P301 Coal, Coke and Pitch Unloading Feeder AA-1, Feeder V-1, Belt I-1 Bucket Elevator S-1, Screws K-12, K-13, K-14 34.6

002P304 Roll Crusher M-3 32.2 002P305 K-3A, K-3B, S-3, Y-1, AM-1&2 Vibrating Scree n 35.4 002P306 Screw K-27, Bins 18 & 19, Disc W-1, Fine Gri nd Mill D-1 33.0 002P307 Air Classifier G-2 31.0 002P308 Cyclone P3 31.0 002P309 Cyclone P1 31.0 002P310 Feeder AA-20, Roll Crusher M-6 31.4 002P311 Bucket Elevator S-6, Vibrating Screen AM-4 31 .4Title V Operating Permit R30-03500002-2010 Page 30 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Equipment Description Max. AllowablePM Emission Limit (lb/hr)

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 Group G - Anode Blocks 003P102 Belt Conveyor BC-5 32.74 003P106 Portable ECL Bins 31.4 003P111 Anode Cleaner 1.2 003P113 Screening Station 31.4 003P114 Vibramill 31.4 003P115 Bucket Elevator 2.4 003P116 Bucket Elevator 2.4 003P203 Reacted Booth System 13.6 [45CSR§7-4.1.] 4.1.2. No person shall cause, suffer, allow or permi t emission of smoke and/or particulate matter into the open air from any process source operation which is greater than twenty (20) percent opacity, except as noted in sub sections 3.2, 3.3, 3.4, 3.5, 3.6, and 3.7. of 45CSR7. [45CSR§7-3.1.] 4.1.3. No person shall cause, suffer, allow or permi t any manufacturing process or storage structure ge nerating fugitive particulate matter to operate that is not equipped with a system, which may include, but not be limite d to, process equipment design, control equipment design or operation and maintenance procedures, to minimiz e the emissions of fugitive particulate matter. To minim ize means such system shall be installed, maintaine d and operated to ensure the lowest fugitive particulate matter emissions reasonably achievable. [45CSR§7-5.1.] 4.1.4. The barge unloader shall not operate more tha n 50 hours per week and the feeder from the large s ilo shall not be operated more than two shifts per day. The emis sions of particulate matter shall not exceed the amounts listed in the following table:

Emission Point ID Emission Unit ID Gas Volume (ACFM) Max Potential PM

Emissions (lbs/hr) Max PM Emissions

w/Controls (lbs/hr) 001S110 001P102 500 20 0.02 001S111 500 20 0.02 001S101 T.P. to 001P105 5000 214 0.21 001S102 T.P. from 001P106 to

001P107 & 001P108 11200 480 0.48 001S103 11200 480 0.48 001S106 001P110 1500 64 0.06 001S108 1500 64 0.06 Compliance with these limits shall demonstrate comp liance with the less stringent limit of 45CSR§7-4.1

. [45CSR13 - R13-0348 and 45CSR§7-4.1.]Title V Operating Permit R30-03500002-2010 Page 31 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 4.2. Monitoring Requirements 4.2.1. The permittee shall monitor the PM emissions by conducting visible emissions checks and keeping records of the results of the monitoring checks in accordance with Section 3.2.1. [45CSR§30-5.1.c.] 

### 4.3. Testing Requirements

4.3.1. None. 

### 4.4. Recordkeeping Requirements 4.4.1. The permittee shall monitor all fugitive PM e mission sources as required by Subsection 4.1.3. to ensure that a system to minimize fugitive emissions has been in stalled or implemented. Records shall be maintaine d on site stating the types of fugitive PM capture and/o r suppression systems used, the times these systems were inoperable, and the corrective actions taken to rep air these systems. [45CSR§30-5.1.c.] 

### 4.5. Reporting Requirements

4.5.1. None. 

### 4.6. Compliance Plan

4.6.1. None.Title V Operating Permit R30-03500002-2010 Page 32 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 5.0. Manufacturing Process Group H Requirements [Rod ding Department] 5.1. Limitations and Standards 5.1.1. No person shall cause, suffer, allow, or perm it PM to be vented into the open air from any type source operation or duplicate source operation, or from all air poll ution control equipment installed on any type sourc e operation or duplicate source operation in excess of the quan tities specified in this permit.

Emission Unit ID Equipment Max. Allowable PM Emission Limit (lb/hr) Group H - Rodding Department 003P301 Horizontal Press 31.4 003P302 Cone Crusher 31.4 003P303 Secondary Crusher 31.4 003P304 Belt Conveyor No. 4 31.4 003P305 Belt Conveyor No. 24 31.4 003P306 Butt Removal 31.4 003P307 Butt Crusher 31.4 003P308 Magnetic Separator 31.4 003P309 Thimble Press 6.0 003P310 Thimble Cleaner 6.0 003P311 Electric Arc Furnaces (3) 31.4 003P312 Rod Cleaning 0.07 003P313 Stub Dryer 0.07 003P314 Hole Cleaner 0.27 003P315 Hole Dryer 0.27 003P316 Assembly and Pouring Station 75.0 003P317 Chamfer 0.001 003P318 Stub Saw 0.0001 003P319 Welding Station 0.0001 003P320 Thimble Press, Combination Press 31.4 003P321 Belt Conveyor No. 22 31.4 003P322 Belt Conveyor No. 23 31.4 003P324 Anode Fine Cleaning (Shot Blast) Machine 31.4 003P323 Anode Rough Cleaning Machine 31.4Title V Operating Permit R30-03500002-2010 Page 33 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Equipment Max. Allowable PM Emission Limit (lb/hr) Group H - Rodding Department

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 003P325 Bath Belt Conveyor 31.4 003P326 Surge Hopper 31.4 003P327 Crushed Feed Conveyor 31.4 003P328 Bath Crusher 31.4 003P329 Bath Screen Feed Conveyor 31.4 003P330 Bath Screen 31.4 003P331 Surge Hopper 31.4 [45CSR§7-4.1.] 5.1.2. No person shall cause, suffer, allow or permi t emission of smoke and/or particulate matter into the open air from any process source operation which is greater than twenty (20) percent opacity, except as noted in sub sections 3.2, 3.3, 3.4, 3.5, 3.6, and 3.7. of 45CSR7. [45CSR§7-3.1. and 45CSR13 - R13-0201] 5.1.3. No person shall cause, suffer, allow or permi t any manufacturing process or storage structure ge nerating fugitive particulate matter to operate that is not equipped with a system, which may include, but not be limite d to, process equipment design, control equipment design or operation and maintenance procedures, to minimiz e the emissions of fugitive particulate matter. To minim ize means such system shall be installed, maintaine d and operated to ensure the lowest fugitive particulate matter emissions reasonably achievable. [45CSR§7-5.1.] 5.1.4. No person shall cause, suffer, allow or permi t the emission into the open air from any source op eration an instack sulfur dioxide concentration exceeding 2,000 parts per million by volume from existing source op erations, except as provided in 45CSR§§10-4.1.a through 4.1.e

. [45CSR§10-4.1. (003P311)] 5.1.5. The operating rate for the rough cleaning andfine cleaning machines shall be limited to 30 tons per hour. [45CSR13 - R13-0201, Specific Requirements A.1. (00 3P323 & 003P324)] 5.1.6. The operating rate for the three conveyor bel ts, the pneumatic conveying system, the crusher, an d the screen associated with the modification to the Bath Proces sing Facility shall be limited to 30 tons per hour. [45CSR13 - R13-0201, Specific Requirements A.2. (00 3P325, 003P327, 003P328, 003P329, & 003P330)] 5.1.7. A dust collector shall be installed, and shal l be properly maintained according to the manufactu rer's specifications such as to maximize its removal effi ciency, and shall be in operation whenever any part of the bath processing circuit is operating. [45CSR13 - R13-0201, Specific Requirements A.3. (Ba ghouse No. 5)]Title V Operating Permit R30-03500002-2010 Page 34 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 5.2. Monitoring Requirements 5.2.1. The permittee shall monitor the PM emissions by conducting visible emissions checks and keeping records of the results of the monitoring checks in accordance with Section 3.2.1. [45CSR§30-5.1.c.] 5.2.2. The permittee shall demonstrate compliance wi th Section 5.1.4. by testing and /or monitoring as set forth in an approved monitoring plan (see Appendix A) for each emission unit. [45CSR§10-8.2.c. (003P311)] 

### 5.3. Testing Requirements

5.3.1. None. 

### 5.4. Recordkeeping Requirements 5.4.1. The permittee shall maintain on-site a recordof all required monitoring data as established in a monitoring plan (see Appendix A) pursuant to 45CSR§10-8.2.c. Such records shall be made available to the Director or his duly authorized representative upon request. Such recor ds shall be retained on-site for a minimum of five years. [45CSR§10-8.3.a. (003P311)] 5.4.2. The permittee shall keep a record of all main tenance performed on the dust collector. These rec ords shall be properly maintained on site for a period not less than five (5) years and be made available to the Dir ector, or his or her designated representative, upon request. [45CSR13 - R13-0201, Other Requirements B.2. (003C3 05)] 5.4.3. The permittee shall monitor all fugitive PM e mission sources as required by Section 5.1.3. to en sure that a system to minimize fugitive emissions has been inst alled or implemented. Records shall be maintained on site stating the types of fugitive PM capture and/or sup pression systems used, the times these systems were inoperable, and the corrective actions taken to rep air these systems. [45CSR§30-5.1.c.] 

### 5.5. Reporting Requirements 5.5.1. The permittee shall submit a periodic excepti on report to the Director, in a manner specified bythe Director. Such an exception report shall provide details of a ll excursions outside the range of measured emissio ns or monitored parameters established in an approved mon itoring plan (see Appendix A) and shall include, bu t not be limited to, the time of the excursion, the magni tude of the excursion, the duration of the excursio n, the cause of the excursion and the corrective action taken. [45CSR§10-8.3.b. (003P311)] 

### 5.6. Compliance Plan

5.6.1. None.Title V Operating Permit R30-03500002-2010 Page 35 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 6.0. Storage Structure Requirements: Group A [Barge Unloading], Group B [Material Tran sfer to/from Potroom Silos], Group C [Bath Processing], Group E [Cathode Paste], Group F [Coal & Coke Unloading], Group G [Anode Blocks], and Group H [Rodding Department] 

### 6.1. Limitations and Standards 6.1.1. No person shall cause, suffer, allow, or perm it emissions of smoke and/or particulate matter int o the open air from any storage structure associated with any manu facturing process.

Emission Unit ID Equipment Description Group A - Barge Unloading 001P107 Alumina Silo No. 1 West 741 001P108 Alumina Silo No. 2 East 742 001P112 Four Tote Bins 001P113 Carbon Ore Bin 11-9206 001P114 Fresh Alumina Bin 11-9201 Group B - Material Transfer to/from Potroom Silos 001P205 Alumina Bin 125 001P207 Alumina Bin 195 004P105 through 004P112 Potroom Silos 1A, 1C, 1D, 1B , 2A, 2C, 2D, 2B 004P205 through 004P212 Potroom Silos 3A, 3C, 3D, 3B , 4A, 4C, 4D, 4B Group C - Bath Processing 001P301 through 001P304 Pure Bath Bins, ContaminatedBath Bin, Feed Storage Bin 156-103 001P310 Fines Storage Bin 001P313 and 001P314 Bath Storage 156-317 and Bath St orage 156-315 Group E - Cathode Paste 002P204 Mill Feed Bin 002P209 through 002P212 Coal Fines Storage Bins, Coal Intermediate Storage Bin, Coal Storage Bin 002P219 Green Scrap Storage Pile Group F - Coal & Coke Unloading 002P302 Coal and Coke Storage Silos 1-4 and 8-11 002P312 through 002P315 Coke Fines Bins 53-68, Coke Coarse Bins 20-31, Anode Butts Bins 36-41, Bin 17 Group G - Anode Blocks 003P101 51 Bin 003P104 15 Ton Make-Up BinTitle V Operating Permit R30-03500002-2010 Page 36 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 003P117 Anode Bin 003P201 No. 2 Bin Fresh Alumina, 003P202 Disengaging Bin 300 Group H - Rodding Department 003P332 Bath Silo [45CSR§7-3.7.] 6.1.2. No person shall cause, suffer, allow or permi t any manufacturing process or storage structure ge nerating fugitive particulate matter to operate that is not equipped with a system, which may include, but not be limite d to, process equipment design, control equipment design or operation and maintenance procedures, to minimiz e the emissions of fugitive particulate matter. To minim ize means such system shall be installed, maintaine d and operated to ensure the lowest fugitive particulate matter emissions reasonably achievable. [45CSR§7-5.1.] 

### 6.2. Monitoring and Recordkeeping Requirements 6.2.1. The permittee shall monitor the smoke and PM emissions by conducting visible emissions checks an d keeping records of the results of the monitoring checks in accordance with Section 3.2.1. [45CSR§30-5.1.c.] 

### 6.3. Testing Requirements

6.3.1. None. 

### 6.4. Recordkeeping Requirements 6.4.1. The permittee shall monitor all fugitive PM e mission sources as required by Subsection 6.1.2. to ensure that a system to minimize fugitive emissions has been in stalled or implemented. Records shall be maintaine d on site stating the types of fugitive PM capture and/o r suppression systems used, the times these systems were inoperable, and the corrective actions taken to rep air these systems. [45CSR§30-5.1.c.] 

### 6.5. Reporting Requirements

6.5.1. None. 

### 6.6. Compliance Plan

6.6.1. None.Title V Operating Permit R30-03500002-2010 Page 37 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 7.0. Manufacturing Process Group I Requirements [TAC Units and Miscellaneous Units] 7.1. Limitations and Standards 7.1.1. No person shall cause, suffer, allow or permi t emission of smoke and/or particulate matter into the open air from any process source operation which is greater than twenty (20) percent opacity, except as noted in sub sections 3.2, 3.3, 3.4, 3.5, 3.6, and 3.7 of 45CSR7. [45CSR§7-3.1.] 7.1.2. The provisions of Section 7.1.1. of this perm it shall not apply to smoke and/or particulate matt er emitted from any process source operation which is less than forty (40) percent opacity for any period or periods a ggregating no more than five (5) minutes in any sixty (60) minute period. [45CSR§7-3.2.] 7.1.3. No person shall cause, suffer, allow, or perm it particulate matter to be vented into the open ai r from any type source operation or duplicate source operation, or from all air pollution control equipment installed on any type source operation or duplicate source operation in e xcess of the quantity specified in this permit:

Emission Unit ID Equipment Description Max. Allowable PM Emission Limit (lb/hr) 005P104A Paste Mixer 2.4 005P106 Paint Booth 0.012 005P108 Shell Rebuild 5.0 005P109 Reduction Cell Super Structure Cleaning Booth 7.5 005P110 Spent Pot Lining Disposal 1.92 [45CSR§7-4.1.] 7.1.4. No person shall circumvent the provisions of this rule by adding additional gas to any exhaust o r group of exhausts for the purpose of reducing the stack gas concentration. [45CSR§7-4.3.] 7.1.5. No person shall cause, suffer, allow, or perm it any manufacturing process generating fugitive particulate matter to operate that is not equipped with a system to mi nimize the emissions of fugitive particulate matter . To minimize means that a particulate capture or suppre ssion system shall be installed to ensure the lowes t fugitive particulate emissions reasonably achievable. [45CSR§7-5.1.] 7.1.6. Emissions from the TAC Systems Unit #1 and Un it #2, from emission point 005S115, shall not excee d the following types and amounts of pollutants:

Pollutant Hourly Emission Rate (lb/hr) Annual Emissio n Rate (lb/yr) PM 0.231 2024 PM10 0.231 2024 Hydrogen Fluoride 0.206 1805Title V Operating Permit R30-03500002-2010 Page 38 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations Pollutant Hourly Emission Rate (lb/hr) Annual Emissio n Rate (lb/yr)

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 Particulate Fluoride 0.046 403 [45CSR13 - R13-2431 - Condition 4.1.1.] 7.1.7. The maximum rate of molten aluminum being tre ated by both TAC units combined shall be 46,000 pou nds per hour and 403,000,000 pounds per year. Compliance w ith the hourly process limit shall be determined by dividing the daily amount of molten aluminum proces sed by the number of hours of operation for that gi ven day. Compliance with the yearly process limit shal l be determined using a rolling yearly total. A ro lling yearly total shall mean the total amount of aluminum proce ssed in pounds at any given time for the previous twelve consecutive months. [45CSR13 - R13-2431 - Condition 4.1.2. (005P114 & 0 05P115)] 7.1.8. The emissions generated from TAC Systems Unit #1 and Unit #2, which includes the stationary alum inum fluoride storage bin for each unit, shall be ventedto the Wheelabrator Canada Air Pollution Control, Model WCC-36, size 45 bag house (Control Device ID No. R- 442), which shall be installed, maintained, and ope rated to maintain compliance with the emissions limits se t forth in Section 7.1.6. of this permit. [45CSR13 - R13-2431 - Conditions 4.1.3. and 4.1.4. (Baghouse R-442)] 7.1.9. Emissions from the crucible cleaner (unit 005 P116) and the siphon cleaner (unit 005P117) shall n ot exceed the following:

PM PM 10 1 lb/hr tpy lb/hr tpy Crucible Cleaner 0.5 2.19 0.5 2.19 Siphon Cleaner 0.04 0.17 0.04 0.17 Total 0.54 2.36 0.54 2.36 [45CSR13 - R13-2431 - Condition 4.1.5.] 7.1.10. Emissions from the crucible cleaner (unit 00 5P116) and the siphon cleaner (unit 005P117) shall be controlled by baghouse 005C112. Said baghouse shall be install ed, operated and maintained so as to achieve a mini mum control efficiency of 99.9%. [45CSR13 - R13-2431 - Condition 4.1.6.] 7.1.11. Pressure drop across baghouse 005C112 shall be maintained at a range between 2 inches of water and 6 inches of water. [45CSR13 - R13-2431 - Condition 4.1.7.]

7.1.12. Operation and Maintenance of Air Pollution Control Equipment. The permittee shall, to the extent practicable, install, maintain, and operate polluti on control equipment, baghouse 005C112, and associated monitoring equipment in a manner consistent with sa fety and good air pollution control practices for m inimizing emissions, or comply with any more stringent limits set forth in this permit or as set forth by any St ate rule, Federal regulation, or alternative control plan app roved by the Secretary. [45CSR§13-5.11. and 45CSR13 - R13-2431, Condition 4 .1.8.]Title V Operating Permit R30-03500002-2010 Page 39 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 7.2. Monitoring Requirements 7.2.1. The permittee shall monitor the smoke and PM emissions by conducting visible emissions checks an d keeping records of the results of the monitoring checks in accordance with Section 3.2.1. of this permit [45CSR§30-5.1.c.] 

### 7.3. Testing Requirements

7.3.1. None. 

### 7.4. Recordkeeping Requirements 7.4.1. For the purpose of determining compliance with the PM limit for the paint booth, the permittee s hall maintain records on the amount of paint consumed on a monthl y basis. [45CSR§30-5.1.c.] 7.4.2. For the purposes of determining compliance wi th the maximum processing rate limit as set forth i n Section 7.1.7. of this permit, the applicant shall maintaincertified daily and monthly records of the amount of molten aluminum treated by TAC system. Such records shall be retained by the permittee for at least five (5) years. Certified records shall be made available to the Di rector or his/her duly authorized representative up on request. [45CSR13 - R13-2431, Condition 4.3.4.] 7.4.3. For the purposes of determining compliance wi th the requirement set forth in condition 7.1.8. of this permit, the permittee shall maintain certified daily record s of the pressure drop across baghouse R-442. Saidrecords shall be retained by the permittee on site for at l east five years. Certified records shall be made a vailable to the Director or his/her duly authorized representative upon request. [45CSR13 - R13-2431, Condition 4.3.5.] 7.4.4. In order to determine compliance with conditi on 7.1.11. of this permit, the permittee shall main tain certified daily records of the pressure drop across baghouse 005C112. Said records shall be retained by the permittee on site for at least five years. Certified records shall be made available to the Director or his/herduly authorized representative upon request. [45CSR13 - R13-2431, Condition 4.3.6.]

7.4.5. Record of Maintenance of Air Pollution Control Equi pment. For pollution control equipment, baghouse 005C112, the permittee shall maintain accurate reco rds of all required pollution control equipment ins pection and/or preventative maintenance procedures. [45CSR13 - R13-2431, Condition 4.3.2.]

7.4.6. Record of Malfunctions of Air Pollution Control Equ ipment. For pollution control equipment, baghouse 005C112, the permittee shall maintain records of th e occurrence and duration of any malfunction or ope rational shutdown of the air pollution control equipment during which excess emissions occur. For each such ca se, the following information shall be recorded: a. The equipment involved. b. Steps taken to minimize emissions during the even t. c. The duration of the event.Title V Operating Permit R30-03500002-2010 Page 40 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 d. The estimated increase in emissions during the ev ent. For each such case associated with an equipment mal function, the additional information shall also be recorded:

e. The cause of the malfunction. f. Steps taken to correct the malfunction. g. Any changes or modifications to equipment or proc edures that would help prevent future recurrences o f the malfunction. [45CSR13 - R13-2431, Condition 4.3.3.] 

### 7.5. Reporting Requirements

7.5.1. None. 

### 7.6. Compliance Plan

7.6.1. None.Title V Operating Permit R30-03500002-2010 Page 41 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 8.0. Fuel Burning Unit Requirements [002P139, 002P14 0, 005P102, 005P103, 005P104)] 8.1. Limitations and Standards 8.1.1. No person shall cause, suffer, allow or permi t emission of smoke and/or particulate matter into the open air from any fuel burning unit which is darker in shade or appearance than ten (10) percent opacity based on a six minute block average. Compliance with this limit shall de monstrate compliance with the less stringent limit of 40 C.F.R. § 60.43c(c) and 45CSR16. [45CSR§2-3.1., 45CSR13 - R13-2140, Condition B.1.] 8.1.2 No person shall cause, suffer, allow or permit the discharge of particulate matter into the open air from all fuel burning units located at one plant, measured in terms of pounds per hour in excess of the product of 0 .09 and the total design heat input in million B.T.U.’s perhour. For Boiler No. 2 (005P102): 3.92 lbs/hr. [45CSR§2-4.1.b. (002P139 & 002P140 Exempt)] 8.1.3. The addition of sulfur oxides to a combustionunit exit gas stream for the purpose of improving emissions control equipment efficiency shall be reviewed by the Director. No person shall cause, suffer, allowor permit the addition of sulfur oxides as described above un less written approval for such addition is providedby the Director. [45CSR§2-4.4. (002P139 & 002P140 Exempt)] 8.1.4. The visible emission standards set forth in S ection 8.1.1. shall apply at all times except in pe riods of start-ups, shutdowns and malfunctions. Where the Director bel ieves that start-ups and shutdowns are excessive in duration and/or frequency, the Director may require an owner or operator to provide a written report demonstrating that such frequent start-ups and shut downs are necessary. [45CSR§2-9.1. (002P139 & 002P140 Exempt)] 8.1.5. At all times, including periods of start-ups, shutdowns and malfunctions, owners and operators s hall, to the extent practicable, maintain and operate any fuel b urning unit(s) including associated air pollution c ontrol equipment in a manner consistent with good air poll ution control practice for minimizing emissions. Determination of whether acceptable operating and m aintenance procedures are being used will be based on information available to the Director which may inc lude, but is not limited to, monitoring results, vi sible emission observations, review of operating and main tenance procedures and inspection of the source. [45CSR§2-9.2. and 45CSR13 - R13-2140, Condition B.1 . (002P139 & 002P140 Exempt)] 8.1.6. No person shall cause, suffer, allow or permi t the discharge of sulfur dioxide into the open airfrom all stacks located at one plant, measured in terms of pounds p er hour, in excess of the amount determined as foll ows: the product of 3.1 and the total design heat inputs forsuch units discharging through those stacks in mil lion BTU's per hour. For Boiler No. 2 (005P102): 134.85 lbs/hr. [45CSR§10-3.1.e. and 45CSR13 - R13-2140, Condition B.2. (002P139 & 002P140 Exempt)] 8.1.7. No person shall circumvent the provisions of this rule by constructing fuel burning unit(s) larg er than would be necessary to provide heat and/or power for an ex isting manufacturing plant, with a reasonable margi n for plant expansion, in order to use that design heat i nput to raise the allowable sulfur content in fuel. [45CSR§10-3.6. and 45CSR13 - R13-2140, Condition B. 2.] 8.1.8. No person shall construct, modify or relocat e any source of sulfur dioxide without first obtain ing a permit in accordance with the provisions of W. Va. Code §22-5 -1 et seq., and Series 13, 14, 19 and 30 of Title 4 5. [45CSR§10-7.1. and 45CSR13 - R13-2140, Condition B. 2.]Title V Operating Permit R30-03500002-2010 Page 42 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 8.1.9. Due to unavoidable malfunction of equipment o r inadvertent fuel shortages, emissions exceeding those provided for in this rule may be permitted by the Director f or periods not to exceed ten (10) days upon specifi c application to the Director. Such application shal l be made within twenty-four (24) hours of the equi pment malfunction or fuel shortage. In cases of major eq uipment failure or extended shortages of conforming fuels, additional time periods may be granted by the Direc tor provided a corrective program has been submitte d by the owner or operator and approved by the Director. [45CSR§10-9.1. and 45CSR13 - R13-2140, Condition B. 2.] 8.1.10. The maximum heat input and maximum fuel cons umption rates for Boilers No. 4 and No. 5 shall not exceed:

Equip. ID Source Maximum Heat Input (10 6 Btu/hr) Natural Gas Usage

(ft3 /hr) (ft3 /yr) #2 Oil Usage Sulfur Content (gal/hr) (gal/yr) 005P103 Boiler No. 4 76.0 66,785 480,000,000 0.05% 550 3,8 00,000 005P104 Boiler No. 5 37.5 32,917 288,356,415 0.05% 258 2,2 60,080

[45CSR13 - R13-2140, Condition A.1.] 8.1.11. Only natural gas or No. 2 fuel oil shall be burned in Boilers No. 4 (005P103) and No. 5 (005P10 4). [45CSR13 - R13-2140, Condition A.2.] 8.1.12. The maximum sulfur content for the No. 2 fue l oil to be burned in Boilers No. 4 (005P103) and N o. 5 (005P104) shall not exceed 0.05% by weight. Compli ance with this limit shall demonstrate compliance w ith the less stringent limit of 45CSR§10-10.2, 40 C.F.R . § 60.42c(d) and 45CSR§16. [45CSR13 - R13-2140, Condition A.3.] 8.1.13. Emissions from Boiler No. 4 (005P103) shall not exceed the limits set forth in the table below:

Pollutant Pounds per Hour (lb/hr) (combusting natural gas) Pounds per Hour (lb/hr) (combusting fuel oil) Tons per Year (TPY) (any combination of fuel) Carbon Monoxide 6.26 2.75 22.49 Nitrogen Oxides 3.73 11.00 38.00 Particulate Matter 0.57 0.72 2.47 Sulfur Dioxide 0.04 3.91 13.49 Volatile Organic Compounds (VOCs) 0.41 0.12 1.47 Hazardous Air Pollutant (HAPs) 0.13 0.08 0.55 Compliance with the PM and SO 2emission limits shall demonstrate compliance with the less stringent limits of 45CSR§2-4.1.b. and 45CSR§10-3.1.e. [45CSR13 - R13-2140, Condition A.4., 45CSR§2-4.1.b. , and 45CSR§10-3.1.e.] 8.1.14. Emissions from Boiler No. 5 (005P104) shall not exceed the limits set forth in the table below:Title V Operating Permit R30-03500002-2010 Page 43 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 Pollutant Pounds per Hour (lb/hr) (combusting natural gas) Pounds per Hour (lb/hr) (combusting fuel oil) Tons per Year (TPY) (any combination of fuel) Carbon Monoxide 3.08 1.29 13.51 Nitrogen Oxides 1.84 5.16 22.60 Particulate Matter 0.28 1.08 4.73 Sulfur Dioxide 0.02 1.83 8.02 Volatile Organic Compounds (VOCs) 0.20 0.06 0.88 Hazardous Air Pollutant (HAPs) 0.06 0.04 0.27 Compliance with the PM and SO 2emission limits shall demonstrate compliance with the less stringent limits of 45CSR§2-4.1.b. and 45CSR§10-3.1.e. [45CSR13 - R13-2140, Condition A.5., 45CSR§2-4.1.b. , and 45CSR§10-3.1.e.] 8.1.15. Boilers No. 4 (Equip ID No. 005P103) and No. 5 (Equip. ID No. 005P104) shall comply with all applicable provisions of 40 C.F.R. 60, Subpart Dc - “Standards of Performance for Small Industrial-CommercialInstitutional Steam Generating Units,” provided that the boilers shall comply with any more stringent requirements as may be set forth under the requirements of this permit. [40 C.F.R. § 60.40c and 45CSR16] 8.1.16. If US EPA has not already promulgated a stan dard pursuant to 40 C.F.R. 63 for industrial, comme rcial, institutional boilers and process heaters, the faci lity shall submit a Part 1 112(j) “equivalent emiss ion limitation by permit” application for case-by-case MACT determ ination, containing the information required in 40 C.F.R. § 63.53 (a), within thirty (30) days of the date fo r a final rule specified in the final order of the United States District Court for the District of Columbia, which is currently December 16, 2010. The Part 1 112(j) application shall identify each affected unit, and address HAP emissions from each of the boilers and process heaters. If the facility determines there are no a ffected units (boilers or process heaters), a state ment of nonapplicability must be submitted in lieu of a Part 1 application. A Part 2 112(j) “equivalent emissionlimitation by permit” application for case-by-case MACT determ ination containing information required in 40 C.F.R . § 63.53 (b) is due within 60 days of the Part 1 112(j ) application submittal. All 112 (j) “equivalent e mission limitation by permit” applications must be submitte d to both WVDEP-Division of Air Quality, and Chief of Permits and Technical Branch, US EPA Region III, Ma il Code 3AP11, 1650 Arch Street, Philadelphia, PA, 19103-2029. [45CSR34, 40 C.F.R. § 63.52] 

### 8.2. Monitoring Requirements 8.2.1. Compliance with the visible emission requirements of Section 8.1.1. shall be determined in accor dance with 40 CFR Part 60, Appendix A, Method 9 on a quarterlybasis. If the result of any visible emissions tes t is equal to or exceeds 10% opacity, then an evaluation to de termine the cause of the exceedance shall be conduc ted within three (3) days, unless the cause of the exce edance is corrected within 24 hours. [45CSR§2-3.2., 45CSR13 - R13-2140, Condition B.1., and 45CSR§30-5.1.c.] 8.2.2. Compliance with the allowable sulfur dioxide emission limitations from fuel burning units shall be based on a continuous twenty-four (24) hour averaging time. The permittee shall not allow emissions to exceed the weight emissions standards for sulfur dioxide as se t forth in this rule, except during one (1) continu ous twenty-Title V Operating Permit R30-03500002-2010 Page 44 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 four (24) hour period in each calendar month and du ring this one (1) continuous twenty-four hour perio d said owner and/or operator shall not allow emissions to exceed such weight emission standards by more than ten percent (10%) without causing a violation of this rule. A continuous twenty-four (24) hour period is defined as one (1) calendar day. [45CSR§10-3.8.] 8.2.3. The liquid pitch hot oil heaters shall be ope rated and maintained in accordance with the manufac turer’s recommendations and specifications and in a manner consistent with good operating practices and shall only burn natural gas. [45CSR§30-5.1.c. (002P139 & 002P140)] 8.2.4. For distillate oil-fired affected facilities with heat input capacities between 2.9 and 29 MW (1 0 and 100 million Btu/hr), where the owner or operator seeks to demon strate compliance with the SO 2standards based on fuel supplier certification, the performance test shall consist of the certification from the fuel supplier , as described under Section 8.5.2.(d) of this permit, as applicab le. [40 C.F.R. §§60.42c(h)(1) and 60.44c(h), 45CSR16 an d 45CSR13 - R13-2140, Condition B.3.] The CEMS and fuel sampling monitoring requirements of 40 C.F.R. § 60.46c (a) and (d) shall not apply t o affected facilities subject to 40 C.F.R. § 60.42c(h ) (1), (2), or (3) where the owner or operator of the affected facility seeks to demonstrate compliance with the S O 2standards based on fuel supplier certification, as described under 40 C.F.R. § 60.48c(f) (1), (2), or (3), as applicable. [40 C.F.R. §60.46c(e), 45CSR16 and 45CSR13 - R13-21 40, Condition B.3.] 

### 8.3. Testing Requirements

8.3.1. For Boilers No. 4 and No. 5: At such reasonable times as the Director may designate, the owner or operator of any fuel burning unit(s) may be required to cond uct or have conducted tests to determine the compli ance of such unit(s) with the emission limitations of secti on 8.1.2. Such tests shall be conducted in accorda nce with the appropriate method set forth in the Appendix to Rule 2 or other equivalent EPA approved method app roved by the Director. The Director, or his duly authoriz ed representative, may at his option witness or con duct such tests. Should the Director exercise his option to conduct such tests, the operator will provide all n ecessary sampling connections and sampling ports located in such manner as the Director may require, power for test equipment, and the required safety equipment such a s scaffolding, railings and ladders to comply with generally accepted good safety practices. [45CSR§2-8.1.b. and 45CSR13 - R13-2140, Condition B .1.] Sufficient information on temperatures, velocities, pressures, weights and dimensional values shall be reported to the Director, with such necessary commentary as he may require to allow an accurate evaluation of the reported test results and the conditions under whic h they were obtained. [45CSR§2-8.1.b.1. and 45CSR13 - R13-2140, ConditionB.1.] The Director, or his duly authorized representative , may conduct such other tests as he may deem neces sary to evaluate air pollution emissions other than those n oted in Section 8.1.2. [45CSR§2-8.1.c. and 45CSR13 - R13-2140, Condition B .1.] 8.3.2. Compliance and performance test methods and p rocedures for particulate matter. The permittee shall conduct an initial performance test as required under 40 C.F.R. § 60.8, and shall conduct subsequent performance tests as requested by the Ad ministrator, to determine compliance with the stand ardsTitle V Operating Permit R30-03500002-2010 Page 45 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 using the following procedures and reference method s: Method 9 (6-minute average of 24 observations) s hall be used for determining the opacity of stack emissi ons. [40 C.F.R. § 60.45c and 45CSR16] 

### 8.4. Recordkeeping Requirements 8.4.1. The permittee shall maintain on-site all reco rds of monitored data. Such records shall be made available to the Director or his duly authorized representative uponrequest. Such records shall be retained on-site f or a minimum of five years. [45CSR§2-8.3.a.] The permittee shall submit a periodic exception rep ort to the Director, in a manner and at a frequencyto be established by the Director. Such exception report shall provide details of all excursions outside th e range of measured emissions or monitored parameters, and sha ll include, but not be limited to, the time of the excursion, the magnitude of the excursion, the duration of the excursion, the cause of the excursion and the corr ective action taken. [45CSR§2-8.3.b.] 8.4.2. The permittee shall maintain records of the o perating schedule, and the quality and quantity of fuel burned in each fuel burning unit as specified: For fuel burni ng units which burn only pipeline quality natural g as, such records shall include, but not be limited to, the d ate and time of start-up and shutdown, and the quan tity of fuel consumed on a monthly basis. For fuel burning unit s which burn only distillate oil, such records shal l include, but not be limited to, the date and time of start-u p and shutdown, the quantity of fuel consumed on a monthly basis and a BTU analysis for each shipment. For fu el burning unit(s) which burn a combination of fuel s, the owner or operator shall comply with the applicable recordkeeping requirements for each fuel burned. [45CSR§2A-7.1.a. and 45CSR§2-8.3.c.] 8.4.3. For the purpose of determining compliance with the maximum heat input and fuel consumption limit ations established for the boilers as set forth in Section s 8.1.10. and 8.1.11., and the maximum emission rat e limits established for the boilers as set forth in Section s 8.1.13. and 8.1.14., the permittee shall maintaindaily, monthly, and annual records of the type and amount of fuel usage, hours of operations, and maintenance work performed on individual boilers. Certified copies of these records shall be made available to the Dir ector or his/her duly authorized representative upon request

. [45CSR13 - R13-2140, Condition B.6.] 

### 8.5. Reporting Requirements 8.5.1. The owner or operator of a fuel burning unit( s) subject to this rule shall report to the Directo r any malfunction of such unit or its air pollution control equipment which results in any excess particulate matter emi ssion rate or excess opacity as provided in one of the followi ng subdivisions: a. Excess opacity periods meeting the following cond itions may be reported on a quarterly basis unless otherwise required by the Director: 1. The excess opacity period does not exceed thirty (30) minutes within any 24-hour period; and 2. Excess opacity does not exceed 40%.Title V Operating Permit R30-03500002-2010 Page 46 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 b. The owner or operator shall report to the Directo r any malfunction resulting in excess particulate m atter or excess opacity, not meeting the criteria set forth in Section 8.5.1.a., by telephone, telefax, or e-mail by the end of the next business day after becoming aware of such condition. The owner or operator shall file a certified written report concerning the malfuncti on with the Director within thirty (30) days provid ing the following information: 1. A detailed explanation of the factors involved orcauses of the malfunction; 2. The date and time of duration (with starting and ending times) of the period of excess emissions; 3. An estimate of the mass of excess emissions disch arged during the malfunction period; 4. The maximum opacity measured or observed during the malfunction; 5. Immediate remedial actions taken at the time of the malfunction to correct or mitigate the effects o f the malfunction; and 6. A detailed explanation of the corrective measures or program that will be implemented to prevent a recurrence of the malfunction and a schedule for su ch implementation. [45CSR§2-9.3.] 8.5.2. Reporting and record keeping requirements. a. The owner or operator of each affected facility s hall submit notification of the date of any reconstruction as provided by 40 C.F.R. § 60.7 of this part. b. The owner or operator of each affected facility s ubject to the SO 2emission limits of 40 C.F.R. §60.42c shall submit to the Administrator the performance test data from the initial and any subsequent performance tests. c. The owner or operator of each affected facility s ubject to the fuel oil sulfur limits under 40 C.F.R . §60.42c shall keep records and submit quarterly reports to the Ad ministrator. Each quarterly report shall be postmarked by the 30th day following the end of the reporting period and include: 1. Calendar dates covered in the reporting period. 2. Each 30-day average sulfur content (weight percen t), calculated during the reporting period, ending with the last 30-day period in the quarter; reasons for any noncompliance with the emission standards; and a description of corrective actions taken. 3. If fuel supplier certification is used to demonstrate compliance, records of fuel supplier certification as described under paragraph d. of this section, as ap plicable. In addition to records of fuel supplier certifications, the quarterly report shall include a certified statement signed by the owner or operat or of the affected facility that the records of fuel suppliercertifications submitted represent all of the fuel combusted during the quarter. d. Fuel supplier certification for distillate oil sh all include the following information: the name of the oil supplier and a statement from the oil supplier that the oil complies with the specifications under the definiti on of distillate oil in 40 C.F.R. §60.41c.Title V Operating Permit R30-03500002-2010 Page 47 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 e. The owner or operator of each affected facility s hall record and maintain records of the amounts of each fuel combusted during each day. f. All records required under this section shall be maintained by the owner or operator of the affectedfacility for a period of two years following the date of such re cord. [40 C.F.R. § 60.48c and 45CSR16] 

### 8.6. Compliance Plan

8.5.1. None.Title V Operating Permit R30-03500002-2010 Page 48 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### 9.0. Primary Aluminum MACT (40 CFR Part 63 Subpart L L) Sources Requirements 9.1. Limitations and Standards 9.1.1. No person shall cause, suffer, allow, or perm it PM to be vented into the open air from any type source operation or duplicate source operation, or from all air poll ution control equipment installed on any type sourc e operation or duplicate source operation in excess of the quan tities specified in this permit.

Emission Unit ID Equipment Maximum Allowable PM Emission Limit (lb/hr) 002P111 Auto Scale AL-1 33 002P112 Auto Scale AL-2 33 002P113 Screw Conveyor K-101 33 002P114 Batch car 33 002P115 South Mixers 1-8 33 002P116 North Mixers 9-16 33 002P117 Belt Conveyor I-6 31.56 002P118 Belt Conveyor I-7 31.56 002P119 Belt Conveyor V-4 34.12 002P120 Belt Conveyor I-8 34.12 002P121 Belt Conveyor I-9 34.12 002P122 Belt Conveyor I-10 34.12 002P123 Cooling Screw AG-1 34.12 002P124 Cooling Screw AG-2 34.12 002P125 Cooling Screw AG-3 34.12 002P126 Cooling Screw AG-4 34.12 002P127 Disc Feeder W11 34.12 002P128 Disc Feeder W12 002P129 Anode Press AJ-1 34.12 002P130 Anode Press AJ-2 002P131 Belt Conveyor I-11 34.12 002P132 Screw Conveyor K-103 34.12 002P135 Screw Conveyor K-321 2.88 002P141 Screw Conveyor K-100 33 002P142 Collecting Hopper 33Title V Operating Permit R30-03500002-2010 Page 49 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

Emission Unit ID Equipment Maximum Allowable PM Emission Limit (lb/hr)

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 003P109 Building No. 52 Ring Furnace 20.8 003P110 Building No. 53 Ring Furnace 20.8 004P113 Ore Bucket-Line 1A 33.8 004P114 Ore Bucket-Line 1B 33.8 004P115 Ore Bucket-Line 2A 35.4 004P116 Ore Bucket-Line 2B 35.4 004P213 Ore Bucket-Line 3A 33.8 004P214 Ore Bucket-Line 3B 33.8 004P215 Ore Bucket-Line 4A 33.8 004P216 Ore Bucket-Line 4B 33.8 [45CSR§7-4.1] 9.1.2. No person shall cause, suffer, allow, or perm it emissions of smoke and/or particulate matter int o the open air from any storage structure associated with any manu facturing process. [45CSR§7-3.7. (002P101 through 002P110, 002P114)] 9.1.3. No person shall cause, suffer, allow or permi t the emission into the open air from any source op eration an instack sulfur dioxide concentration exceeding 2,000 parts per million by volume from existing source op erations, except as provided in 45CSR§§10-4.1.a through 4.1.e

. [45CSR§10-4.1. (003P109, 003P110, 004P101 through 0 04P104, 004P201 through 004P204)] 9.1.4. No person shall cause, suffer, allow or permi t any manufacturing process or storage structure ge nerating fugitive particulate matter to operate that is not equipped with a system, which may include, but not be limite d to, process equipment design, control equipment design or operation and maintenance procedures, to minimiz e the emissions of fugitive particulate matter. To minim ize means such system shall be installed, maintaine d and operated to ensure the lowest fugitive particulate matter emissions reasonably achievable. [45CSR§7-5.1.] 9.1.5. a. Primary aluminum reduction potlines which are equipped with a fluidized bed reactor or other s imilar gas

cleaning device which utilizes particulate matter a s a media or as a component of a media for collecti ng or reducing the emissions of gaseous fluorides, sha ll be exempted from the requirements of 45CSR§§7-4. 1 and 4.4 provided that at least ninety-nine percent (99%) of the gaseous fluoride is removed from the e xit gas stream by such device prior to discharging the cleaned gas stream to the open air; and the particu late matter loading in the exit gas stream is not greate r than 0.01 grains per standard cubic foot of dry s tack gas. b. The emissions of gaseous fluorides and particulate fluorides from prebake cells shall be controlledby a system for continuous emission reduction which syst em shall achieve at least ninety percent (90%) fluo ride emissions capture efficiency through its primary co llection system and at least ninety-nine percent (9 9%) fluoride emissions removal efficiency through its p rimary removal system; and c. Anode butts from such a plant which are recycled in an on-site anode bake plant shall be cleaned as necessary to minimize adherent fluoride bearing bath material. [45CSR§7-4.7.]Title V Operating Permit R30-03500002-2010 Page 50 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 9.1.6. Potlines. The permittee shall not discharge or cause to be discharged into the atmosphere any emissions of tot al fluorides (TF) in excess of 1.5 kg/Mg (3.0 lb/ton) of aluminum produced for each CWPB2 potline. [40 C.F.R. § 63.843(a)(1)(ii) and 45CSR34] The permittee may average TF emissions from potline s and demonstrate compliance with the limits in the table below using the procedures in paragraphs (1) and (2 ) below. 1. Monthly average emissions of TF shall not exceed the applicable emission limit in the table below. The emission rate shall be calculated based on the tota l emissions from all potlines over the period divid ed by the quantity of aluminum produced during the period , from all potlines comprising the averaging group. 2. To determine compliance with the applicable emiss ion limit for TF emissions, the permittee shall determine the monthly average emissions in lb/ton from each p otline from at least three runs per potline each mo nth for TF secondary emissions using the procedures andmethods in Sections 9.3.1. and 9.3.2. The permitt ee shall combine the results of secondary TF monthly a verage emissions with the TF results for the primary control system and divide total emissions by total aluminum production.

Type Monthly TF limit (1b/ton) for given number of potli nes

2 lines 3 lines 4 lines 5 lines 6 lines 7 lines 8 lines CWPB2 2.9 2.8 2.7 2.7 2.6 2.6 2.6 [40 C.F.R. § 63.846(b) and 45CSR34] 9.1.7. Paste production plants. The permittee shall install, operate, and maintai n equipment to capture and control polycyclic organic matter (POM) emissions from eachpaste production plant. 1. The emission capture system shall be installed an d operated to meet the generally accepted engineeri ng standards for minimum exhaust rates as published bythe American Conference of Governmental Industrial Hygienists in Chapters 3 and 5 of "Industrial Venti lation: A Handbook of Recommended Practice" (incorporated by reference in 40 C.F.R. § 63.841); and 2. Captured emissions shall be routed through a clos ed system to a dry coke scrubber; [40 C.F.R. §63.843(b)(1)&(2) and 45CSR34 (VR-371 & Sonair Baghouse R-300)] 9.1.8. Anode bake furnaces . The permittee shall not discharge or cause to be discharged into the atmosphere any emissions of total fluorides (TF) or polycyclic org anic matter (POM) in excess of the limits below. 1. Emissions of total fluorides (TF) shall not excee d 0.10 kg/Mg (0.20 lb/ton) of green anode; and 2. Emissions of polycyclic organic matter (POM) shal l not exceed 0.09 kg/Mg (0.18 lb/ton) of green anod e. [40 C.F.R. § 63.843(c)(1) and (2) and 45CSR34 (003P 109 and 003P110)] The permittee may average TF emissions and POM emis sions from anode bake furnaces and demonstrate compliance with the limits in the table below using the procedures in paragraphs 1. and 2. below. 1. Annual emissions of TF and/or POM from a given nu mber of anode bake furnaces making up each averaging group shall not exceed the applicable emi ssion limit in the table below in any one year; andTitle V Operating Permit R30-03500002-2010 Page 51 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 2. To determine compliance with the applicable emiss ion limit in the table below for anode bake furnace s, the permittee shall determine TF and/or POM emissio ns from the control device for each furnace at leas t once a year using the procedures and methods in Sec tions 9.3.1. and 9.3.2.

Number of furnaces Emission limit (lb/ton of anode) TF POM 2 0.11 0.17 3 0.09 0.17 4 0.077 0.17 5 0.07 0.17 [40 C.F.R. § 63.846(c) and 45CSR34] 9.1.9. Pitch storage tanks. Each pitch storage tank shall be equipped with a n emission control system designed and operated to reduce inlet emissions of polycyclic o rganic matter (POM) by 95 percent or greater. [40 C.F.R. § 63.844(d) and 45CSR34] 9.1.10. Applicability. The provisions in 40 C.F.R. §§ 63.845(a) through (i) shall apply to any CWPB2 potline that adds a new potroom group to an existing potline or that is associated with a potroom group that meets the definition of "modified potroom group" or "reconstructed potroom group." [40 C.F.R. §§ 63.845(a) through (i) and 45CSR34] 

### 9.2. Monitoring Requirements 9.2.1. The permittee shall demonstrate compliance wi th Section 9.1.3. by monitoring as set forth in an approved monitoring plan (see Appendix A) for each emission unit. [45CSR§10-8.2.c. (003P109, 003110, 004P101 through 004P104, 004P201 through 004P204)] 9.2.2. Initial compliance with the standards in Section 9.1.7. for existing paste production plants wil l be demonstrated through site inspection(s) and review of site recor ds by the applicable regulatory authority. [40 C.F.R. §63.847(f) and 45CSR34 (VR-371 & Sonair Baghouse R-300)] 9.2.3. The permittee shall demonstrate initial compl iance with the standard for pitch storage tanks in Section 9.1.9. by preparing a design evaluation or by conducting aperformance test. The permittee shall submit for approval by the regulatory authority the information specifi ed in 1. and 2. below where a design evaluation is performed or the information specified in 3. of this section where a performance test is conducted. 1. A description of the parameters to be monitored t o ensure that the control device is being properly operated and maintained, an explanation of the criteria usedfor selection of that parameter (or parameters), a nd the frequency with which monitoring will be performed; and 2. Where a design evaluation is performed, documenta tion demonstrating that the control device used achieves the required control efficiency during rea sonably expected maximum filling rate. The documentation shall include a description of the ga s stream that enters the control device, including flow and POM content under varying liquid level conditio ns, and the information specified in paragraphs i. through vi., as applicable.Title V Operating Permit R30-03500002-2010 Page 52 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 i. If the control device receives vapors, gases, or liquids, other than fuels, from emission points oth er than pitch storage tanks, the efficiency demonstration is to include consideration of all vapors, gase s, and liquids, other than fuels, received by the control device; ii. If an enclosed combustion device with a minimum residence time of 0.5 seconds and a minimum temperature of 760  C (1,400  F) is used to meet the emission reduction requireme nt specified in 9.1.9., documentation that those conditions exist i s sufficient to meet the requirements of 9.1.9.; iii. Except as provided in paragraph ii. of this sec tion, for thermal incinerators, the design evaluati on shall include the autoignition temperature of the organic HAP, the flow rate of the organic HAP emission stream, the combustion temperature, and the residen ce time at the combustion temperature; iv. If the pitch storage tank is vented to the emiss ion control system installed for control of emissio ns from the paste production plant pursuant to Section 9.1. 7., documentation of compliance with the requirements of 9.1.7. is sufficient to meet the re quirements of 9.1.9.; v. For carbon adsorbers, the design evaluation shall include the affinity of the organic vapors for carbon, the amount of carbon in each bed, the number of bed s, the humidity of the feed gases, the temperature of the feed gases, the flow rate of the organic HAP emission stream, and if applicable, the desorption schedule, the regeneration stream pressure or tempe rature, and the flow rate of the regeneration strea m. For vacuum desorption, the pressure drop shall be i ncluded; and vi. For condensers, the design evaluation shall incl ude the final temperature of the organic HAP vapors , the type of condenser, and the design flow rate of the organic HAP emission stream. 3. If a performance test is conducted, the permittee shall determine the control efficiency for POM during tank loading using Method 315 in 40 C.F.R. Part 63 appen dix A and shall include the following information: i. Identification of the pitch storage tank and control device for which the performance test will be submitted; and ii. Identification of the emission point(s) that share the control device with the pitch storage tank a nd for which the performance test will be conducted. [40 C.F.R. §63.847(g) and 45CSR34] 9.2.4. The permittee shall determine the operating l imits and monitoring frequency for each control dev ice that is to be monitored as required in Section 9.2.7. 1. For potlines and anode bake furnaces, the owner o r operator shall determine upper and/or lower operating limits, as appropriate, for each monitoring device for the emission control system from the values rec orded during each of the runs performed during the initia l performance test and from historical data from pr evious performance tests conducted by the methods specifie d in this subpart. 2. For a paste production plant, the owner or operat or shall specify and provide the basis or rationale for selecting parameters to be monitored and the associ ated operating limits for the emission control devi ce. 3. The owner or operator may redetermine the upper a nd/or lower operating limits, as appropriate, basedon historical data or other information and submit an application to the applicable regulatory authority toTitle V Operating Permit R30-03500002-2010 Page 53 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 change the applicable limit(s). The redetermined li mits shall become effective upon approval by the applicable regulatory authority. [40 C.F.R. §63.847(h) and 45CSR34] 9.2.5. TF emissions from potlines. Using the procedures in Section 9.3.1. and in the approved test plan, the permittee shall monitor emissions of TF from each potline by conducting monthly performance tests. The permitte e shall compute and record the monthly average from at leas t three runs for secondary emissions and the previo us 12- month average of all runs for the primary control s ystem to determine compliance with the applicable e mission limit. The owner or operator must include all vali d runs in the monthly average. The duration of eachrun for secondary emissions must represent a complete operating cycle. [40 C.F.R. §63.848(a) and 45CSR34] Similar potlines. As an alternative to monthly monitoring of TF emi ssions from each potline using the test methods in Section 9.3.2., the permittee may perform monthly monitoring of TF emissions from one potli ne using the test methods in Section 9.3.2. to represe nt the performance of similar potline(s). The simil ar potline(s) shall be monitored using an alternative method that meets the requirements of paragraphs 1. through 7. of this section. Two or more potlines are similar if the o wner or operator demonstrates that their structure, operability, type of emissions, volume of emissions, and concentration of emissions are substantially equivalent. 1. To demonstrate (to the satisfaction of the regulatory authority) that the level of emission control performance is the same or better, the owner or ope rator shall perform an emission test using an alternative monitoring procedure for the similar potline simult aneously with an emission test using the applicable test methods. The results of the emission test using th e applicable test methods must be in compliance with the applicable emission limit for existing potlines in Section 9.1.6. An alternative method for TF emissi ons must account for or include gaseous fluoride and cannot be based on measurement of particulate matter or particulate fluoride alone. 2. An HF continuous emission monitoring system is anapproved alternative for the monitoring of TF secondary emissions. 3. An permittee electing to use an alternative monit oring procedure shall establish an alternative emis sion limit based on at least nine simultaneous runs usin g the applicable test methods and the alternative monitoring method. All runs must represent a full process cycle. 4. The owner or operator shall derive an alternative emission limit for the HF continuous emission moni tor or an alternative method using either of the follow ing procedures: i. Use the highest value from the alternative methodassociated with a simultaneous run by the applicab le test method that does not exceed the applicable emi ssion limit; or ii. Correlate the results of the two methods (the ap plicable test method results and the alternative monitoring method results) and establish an emissio n limit for the alternative monitoring system that corresponds to the applicable emission limit. 5. The owner or operator shall submit the results re quired in paragraph 4. of this section and all supp orting documentation to the applicable regulatory authority for review and approval. 6. The regulatory authority shall review and approve or disapprove the request for an alternative metho d and alternative emission limit. The criterion for appro val shall be a demonstration (to the satisfaction o f theTitle V Operating Permit R30-03500002-2010 Page 54 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 regulatory authority) that the alternative method a nd alternative emission limit achieve a level of em ission control that is the same as or better than the leve l that would have otherwise been achieved by the applicable method and emission limit. 7. If the alternative method is approved by the appl icable regulatory authority, the owner or operator shall perform monthly emission monitoring using the appro ved alternative monitoring procedure to demonstrate compliance with the alternative emission limit for each similar potline. [40 C.F.R. §63.848(d) and 45CSR34] Reduced sampling frequency. The permittee may submit a written request to the applicable regulatory authority to establish an alternative testing requirement to reduce the sampling of secondary TF emissions from potlines from monthly to quarterly. 1. In the request, the permittee shall provide information and data demonstrating, to the satisfaction of the applicable regulatory authority, that secondary emi ssions of TF from potlines have low variability during normal operations using the procedures in paragraph s i. or ii. below. i. Submit data from 24 consecutive months of samplin g that show the average TF emissions are less than 60 percent of the applicable limit and that no monthly performance test in the 24 months of sampling exceeds 75 percent of the applicable limit; or ii. Submit data and a statistical analysis that the regulatory authority may evaluate based on the appr oach used in "Primary Aluminum: Statistical Analysis of Potline Fluoride Emissions and Alternative Sampling Frequency" (EPA-450-86-012, October 1986), which is available from the National Technical Information Service (NTIS), 5285 Port Roy al Road, Springfield, VA 22161. 2. An approved alternative requirement must include a test schedule and the method to be used to measur e emissions for performance tests. 3. The owner or operator of a plant that has receive d approval of an alternative sampling frequency und er 40 C.F.R. § 60.194 is deemed to have approval of the a lternative sampling frequency under this subpart. 4. If emissions in excess of the applicable TF limit occur while performing quarterly sampling approvedunder paragraph 1.i. of this section, the owner or operat or shall return to monthly sampling for at least 12 months and may reduce to quarterly sampling when: i. The average of all tests performed over the most recent 24-month period does not exceed 60 percent of the applicable limit, and ii. No more than one monthly performance test in the most recent 24-month period exceeds 75 percent of the applicable limit. 5. If emissions in excess of the applicable TF limit occur while performing quarterly sampling approvedunder paragraph 1.ii. of this section, the owner or operator shall immediately return to the monthly samplin g schedule until another request for an alternative s ampling frequency is approved by the applicable regulatory authority. [40 C.F.R. §63.848(e) and 45CSR34]Title V Operating Permit R30-03500002-2010 Page 55 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 9.2.6. TF and POM emissions from anode bake furnaces. Using the procedures in Section 9.3.1. and in the approved test plan, thepermittee shall monitor TF and POM em issions from each anode bake furnace on an annual b asis. The permittee shall compute and record the annual a verage of TF and POM emissions from at least three runs to determine compliance with the applicable emissio n limits. The permittee must include all valid run s in the annual average. [40 C.F.R. §63.848(c) and 45CSR34] 9.2.7. Monitoring parameters for emission control devices. The permittee shall install, operate, calibrate, a nd maintain a continuous parameter monitoring system for each e mission control device. The owner or operator shal l submit for approval by the regulatory authority a d escription of the parameter(s) to be monitored, the operating limits, and the monitoring frequency to ensure that the control device is being properly operated and maintained. An explanation of the criteria used for selection o f the parameter(s), the operating limits, and the monitoring frequency, including how these relate to emission c ontrol also shall be submitted to the regulatory au thority. For dry alumina scrubbers, devices for the measurement of alumina flow and air flow shall be installed

. [40 C.F.R. §63.848(f) and 45CSR34] 9.2.8. Visible emissions. The owner or operator shall visually inspect the e xhaust stack(s) of each control device on a daily basis for evidence of any visible emissions indicating abnormal operation. [40 C.F.R. §63.848(g) and 45CSR34] 9.2.9. Corrective action. If a monitoring device for a primary control devi ce measures an operating parameter outside the limit(s) established pursuant to Section 9.2.4. , if visible emissions indicating abnormal operatio n are observed from the exhaust stack of a control device during a daily inspection, or if a problem is dete cted during the daily inspection of a wet roof scrubber for potline secondary emission control, the owner or operator shall initiate the corrective action procedures identifie d in the startup, shutdown, and malfunction plan wi thin 1 hour. Failure to initiate the corrective action procedure s within 1 hour or to take the necessary corrective actions to remedy the problem is a violation. [40 C.F.R. §63.848(h) and 45CSR34] 9.2.10. Exceedances. If the limit for a given operating parameter asso ciated with monitoring a specific control device is exceeded six times in any semiannual reporting p eriod, then any subsequent exceedance in that reporting period is a violation. For the purpose of determin ing the number of exceedances, no more than one exc eedance shall be attributed in any given 24-hour period. [40 C.F.R. §63.848(i) and 45CSR34] 9.2.11. Weight of aluminum and green anodes. The owner or operator of a new or existing potline or anode bake furnace shall install, operate, and maintain a moni toring device to determine the daily weight of alum inum produced and the weight of green anode material pla ced in the anode bake furnace. The weight of greenanode material may be determined by monitoring the weight of all anodes or by monitoring the number of anode s placed in the furnace and determining an average we ight from measurements of a representative sample o f anodes. [40 C.F.R. §63.848(j) and 45CSR34] 9.2.12. Accuracy and calibration. The owner or operator shall submit recommended ac curacy requirements to the regulatory authority for review and approval. All monitoring devices required by this section must be certified by the owner or operator to meet the accuracy requi rements and must be calibrated in accordance with the manufacturer's instructions. [40 C.F.R. §63.848(k) and 45CSR34]Title V Operating Permit R30-03500002-2010 Page 56 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 9.2.13. Alternative operating parameters. The owner or operator may monitor alternative control device operating parameters subject to prior written approval by the applicable regulatory authority. [40 C.F.R. §63.848(l) and 45CSR34] 9.2.14. Other control systems. A permittee using a control system not identified in this section shall request that the applicable regulatory authority include the recomme nded parameters for monitoring in the facility's part 70 permit. [40 C.F.R. §63.848(m) and 45CSR34] 

### 9.3. Testing Requirements

9.3.1. Test plan. The permittee shall prepare a site-specific test plan prior to the performance test according to the requirements of 40 C.F.R. § 63.7(c). The test planmust include procedures for conducting the perform ance test required in Section 9.2.5.and 9.2.6. for emiss ion monitoring. In addition to the information req uired by 40 C.F.R. § 63.7, the test plan shall include:

1. Procedures to ensure a minimum of three runs are performed annually for the primary control system f or each source; 2. For a source with a single control device exhaust ed through multiple stacks, procedures to ensure th at at least three runs are performed annually by a repres entative sample of the stacks satisfactory to the applicable regulatory authority; 3. For multiple control devices on a single source, procedures to ensure that at least one run is perfo rmed annually for each control device by a representativ e sample of the stacks satisfactory to the applicab le regulatory authority; 4. Procedures for sampling single stacks associated with multiple anode bake furnaces; 5. For plants with roof scrubbers, procedures for ro tating sampling among the scrubbers or other proced ures to obtain representative samples as approved by the applicable regulatory authority; 6. Procedures for establishing the frequency of testing to ensure that at least one run is performed be fore the 15th of the month, at least one run is performed af ter the 15th of the month, and that there are at le ast 6 days between two of the runs during the month, or that secondary emissions are measured according to a n alternate schedule satisfactory to the applicable r egulatory authority. [40 C.F.R. § 63.847(b) and 45CSR34] Performance test requirements. The initial performance test and all subsequent pe rformance tests shall be conducted in accordance with the requirements of th e general provisions in 40 C.F.R. 63 Subpart A, the approved test plan, and the procedures in this section.

1. TF emissions from potlines . For each potline, the permittee shall measure an d record the emission rate of TF exiting the outlet of the primary control system for each potline and the rate of secondary emissio ns exiting through each roof monitor, or for a plant w ith roof scrubbers, exiting through the scrubbers. Using Equation 1, the owner or operator shall compute andrecord the average of at least three runs each mon th for secondary emissions and at least three runs eac h year for the primary control system to determine compliance with the applicable emission limit. Com pliance is demonstrated when the emission rate of T F is equal to or less than the applicable emission li mit in Section 9.1.6. of this permit.Title V Operating Permit R30-03500002-2010 Page 57 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 Compute the emission rate (Ep) of TF from each potl ine using Equation 1:

Where: E p =emission rate of TF from a potline, kg/Mg (lb/ton) ; C s1 =concentration of TF from the primary control syste m, mg/dscm (mg/dscf); Q sd =volumetric flow rate of effluent gas corresponding to the appropriate subscript location, dscm/hr (dscf/hr); C s2 =concentration of TF as measured for roof monitor e missions, mg/dscm (mg/dscf); P=aluminum production rate, Mg/hr (ton/hr); K=conversion factor, 10 6 mg/kg (453,600 mg/lb); 1 = subscript for primary control system effluent g as; and 2 = subscript for secondary control system or roof monitor effluent gas.

2. Previous control device tests . If the permittee has performed more than one test of primary emission control device(s) for a potline or for a bake furna ce during the previous consecutive 12 months, the average of all runs performed in the previous 12-mo nth period shall be used to determine the contribution from the primary emission control syst em. 3. TF and POM emissions from anode bake furnaces . For each anode bake furnace, the permittee shall measure and record the emission rate of TF and POM exiting the exhaust stacks(s) of the primary emission control system for each anode bake furnace . Using Equation 2, the permittee shall compute and record the average of at least three runs each year to determine compliance with the applicable emission limits for TF and POM. Compliance is demon strated when the emission rates of TF and POM are equal to or less than the applicable TF and POM emission limits in Section 9.1.8. of this permit. [40 C.F.R. § 63.847(d) and 45CSR34] Compute the emission rate (E b ) of TF from each anode bake furnace using Equation2,

Where: E b= emission rate of TF, kg/mg (lb/ton) of green ano des produced; C s= concentration of TF, mg/dscm (mg/dscf); Q sd= volumetric flow rate of effluent gas, dscm/hr (d scf/hr); P b= quantity of green anode material placed in the f urnace, mg/hr (ton/hr); and K = conversion factor, 10 6 mg/kg (453,600 mg/lb).Title V Operating Permit R30-03500002-2010 Page 58 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 4. Compute the emission rate of POM from each anode bake furnace using Equation 2, where C s= concentration of POM, mg/dscm (mg/dscf). 5. Determine the weight of the aluminum tapped from the potline and the weight of the green anode material placed in the anode bake furnace using the monitori ng devices required in 40 C.F.R. § 63.848(j). 6. Determine the aluminum production rate (P) by div iding the number of hours in the calendar month int o the weight of aluminum tapped from the potline duri ng the calendar month that includes the three runs of a performance test. 7. Determine the rate of green anode material introd uced into the furnace by dividing the number of ope rating hours in the calendar month into the weight of gree n anode material used during the calendar month in which the performance test was conducted. [40 C.F.R. § 63.847(e) and 45CSR34] 9.3.2. The permittee shall use the following referen ce methods to determine compliance with the applicable emission limits for TF and POM emissions: 1. Method 1 in appendix A to part 60 of this chapterfor sample and velocity traverses; 2. Method 2 in appendix A to part 60 of this chapterfor velocity and volumetric flow rate; 3. Method 3 in appendix A to part 60 of this chapterfor gas analysis; 4. Method 13A or Method 13B in appendix A to part 60 of this chapter, or an approved alternative, for the concentration of TF where stack or duct emissions are sampled; 5. Method 13A or Method 13B and Method 14 or Method 14A in appendix A to part 60 of this chapter or an approved alternative method for the concentratio n of TF where emissions are sampled from roof monitors not employing wet roof scrubbers; 6. Method 315 in appendix A to this part or an appro ved alternative method for the concentration of POM where stack or duct emissions are sampled; and 7. Method 315 in appendix A to this part and Method 14 in appendix A to part 60 of this chapter or an approved alternative method for the concentration o f POM where emissions are sampled from roof monitors not employing wet roof scrubbers. [40 C.F.R. § 63.849(a) and 45CSR34] 9.3.3. The permittee may use an alternative test method for TF or POM emissions providing: 1. The owner or operator has already demonstrated th e equivalency of the alternative method for a speci fic plant and has received previous approval from the A dministrator or the applicable regulatory authorityfor TF or POM measurements using the alternative method ; or 2. The owner or operator demonstrates to the satisfa ction of the applicable regulatory authority that the results from the alternative method meet the criteria speci fied in Section 9.2.5. under Similar Potlines . The results from the alternative method shall be based on simul taneous sampling using the alternative method and the following reference methods:Title V Operating Permit R30-03500002-2010 Page 59 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 i. For TF, Methods 13 and 14 or Method 14A in append ix A to part 60 of this chapter; or ii. For POM, Method 315 in appendix A to this part a nd Method 14 in appendix A to part 60 of this chapter. [40 C.F.R. § 63.849(e) and 45CSR34] 

### 9.4. Recordkeeping Requirements 9.4.1. The permittee shall maintain on-site a recordof all required monitoring data as established in a monitoring plan (see Appendix A) pursuant to 45CSR§10-8.2.c. Such records shall be made available to the Director or his duly authorized representative upon request. Such recor ds shall be retained on-site for a minimum of five years. [45CSR§10-8.3.a. (003P109, 003P110, 004P101 throug h 004P104, 004P201 through 004P204)] 9.4.2. The permittee shall maintain files of all inf ormation (including all reports and notifications) required by 40 C.F.R. § 63.10(b) and by this subpart. 1. The owner or operator must retain each record forat least 5 years following the date of each occurr ence, measurement, maintenance, corrective action, report , or record. The most recent 2 years of records mus t be retained at the facility. The remaining 3 years of records may be retained offsite; 2. The owner or operator may retain records on micro film, on a computer, on computer disks, on magnetic tape, or on microfiche; 3. The owner or operator may report required information on paper or on a labeled computer disc using commonly available and compatible computer software ; and 4. In addition to the general records required by 40 C.F.R. § 63.10(b), the owner or operator shall mai ntain records of the following information: i. Daily production rate of aluminum; ii. Daily production rate of green anode material pl aced in the anode bake furnace; iii. A copy of the startup, shutdown, and malfunctio n plan; iv. Records of design information for paste producti on plant capture systems; v. Records of design information for an alternative emission control device for a paste production plan t; vi. Records supporting the monitoring of similar potlines demonstrating that the performance of similar potlines is the same as or better than that of potl ines sampled by manual methods; vii. Records supporting a request for reduced sampli ng of potlines; viii. Records supporting the correlation of e missions measured by a continuous emission monitori ng system to emissions measured by manual methods and the derivation of the alternative emission limit derived from the measurements; ix. The current implementation plan for emission ave raging and any subsequent amendments;Title V Operating Permit R30-03500002-2010 Page 60 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 x. Records, such as a checklist or the equivalent, d emonstrating that the daily inspection of a potline with wet roof scrubbers for secondary emission control h as been performed as required in Section 9.2.7., including the results of each inspection; xi. Records, such as a checklist or the equivalent, demonstrating that the daily visual inspection of the exhaust stack for each control device has been perf ormed as required in Section 9.2.8., including the results of each inspection; xii. For a potline equipped with an HF continuous em ission monitor, records of information and data required by 40 C.F.R. § 63.10(c); xiii. Records documenting the corrective acti ons taken when the limit(s) for an operating parame ter established under § 63.847(h) were exceeded, when v isible emissions indicating abnormal operation were observed from a control device stack during a daily inspection required under Section 9.2.8., or when a problem was detected during the daily inspec tion of a wet roof scrubber for potline secondary control required in Section 9.2.7.; xiv. Records documenting any POM data that are inval idated due to the installation and startup of a cathode; and xv. Records documenting the portion of TF that is me asured as particulate matter and the portion that i s measured as gaseous when the particulate and gaseou s fractions are quantified separately using an approved test method. [40 C.F.R. § 63.850(e) and 45CSR34] 

### 9.5. Reporting Requirements 9.5.1. The permittee shall submit a periodic excepti on report to the Director, in a manner specified bythe Director. Such an exception report shall provide details of a ll excursions outside the range of measured emissio ns or monitored parameters established in an approved mon itoring plan (see Appendix A) and shall include, bu t not be limited to, the time of the excursion, the magni tude of the excursion, the duration of the excursio n, the cause of the excursion and the corrective action taken. [45CSR§10-8.3.b. (003P109, 003P110, 004P101 through 004P104, 004P201 through 004P204)] 9.5.2. Notifications. The owner or operator shall submit the following written notifications: 1. Notification for an area source that subsequentlyincreases its emissions such that the source is a major source subject to the standard; 2. Notification that a source is subject to the stan dard, where the initial startup is before the effec tive date of the standard; 3. Notification that a source is subject to the stan dard, where the source is new or has been reconstru cted, the initial startup is after the effective date of the standard, and for which an application for approval of construction or reconstruction is not required; 4. Notification of intention to construct a new majo r source or reconstruct a major source; of the date construction or reconstruction commenced; of the an ticipated date of startup; of the actual date of st artup, where the initial startup of a new or reconstructedsource occurs after the effective date of the stan dard, andTitle V Operating Permit R30-03500002-2010 Page 61 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 for which an application for approval of constructi on or reconstruction is required [see 40 C.F.R. §§ 63.9(b)(4) and (b)(5)]; 5. Notification of initial performance test; 6. Notification of initial compliance status; 7. One-time notification for each affected source of the intent to use an HF continuous emission monito r; and 8. Notification of compliance approach. The owner oroperator shall develop and submit to the applicabl e regulatory authority, if requested, an engineering plan that describes the techniques that will be use d to address the capture efficiency of the reduction cel ls for gaseous hazardous air pollutants in complian ce with the emission limits in Sections 9.1.6., 9.1.7., 9.1 .8, and 9.1.9. [40 C.F.R. § 63.850(a) and 45CSR34] 9.5.3. Performance test reports. The owner or operator shall report the results of the initial performance test as part of the notification of compliance status required i n Section 9.5.2.6. of this section. Except as provi ded in Section 9.5.5., the owner or operator shall submit a summary of all subsequent performance tests to th e applicable regulatory authority on an annual basis. [40 C.F.R. § 63.850(b) and 45CSR34] 9.5.4. Startup, shutdown, and malfunction plan and reports

. The owner or operator shall develop and implement a written plan as described in 40 C.F.R. § 63.6(e)(3) that contains specific procedures to be followed f or operating the source and maintaining the source during periods of startup, shutdown, and malfunction a nd a program of corrective action for malfunctioning pro cess and control systems used to comply with the st andard. The plan does not have to be submitted with the permit appplication or included in the operating permi t. The permitting authority may review the plan upon reque st. In addition to the information required in 40 C .F.R. § 63.6(e)(3), the plan shall include: 1. Procedures, including corrective actions, to be f ollowed if a monitoring device measures an operatin g parameter outside the limit(s) established under Se ction 9.2.4., if visible emissions from an exhaust stack indicating abnormal operation of a control device are observed by the owner or operator during the dai ly inspection required in Section 9.2.8., or if a prob lem is detected during the daily inspection of a we t roof scrubber for potline secondary emission control req uired in Section 9.2.7.; and 2. The owner or operator shall also keep records of each event as required by 40 C.F.R. § 63.10(b) and record and report if an action taken during a startup, shu tdown, or malfunction is not consistent with the procedures in the plan as described in 40 C.F.R. § 63.6(e)(3)(iv). [40 C.F.R. § 63.850(c) and 45CSR34] 9.5.5. Excess emissions report. As required by 40 C.F.R. § 63.10(e)(3), the owner or operator shall submit a report (or a summary report) if measured emissions are in excess of the applicable standard. The report shall contain the information specified in 40 C.F.R. § 63.10(e)(3 )(v) and be submitted semiannually unless quarterlyreports are required as a result of excess emissions. [40 C.F.R. § 63.850(d) and 45CSR34] 

### 9.6. Compliance Plan

9.6.1. None.Title V Operating Permit R30-03500002-2010 Page 62 of 69

Century Aluminum of West Virginia, Inc. • Ravensw ood Operations

West Virginia Department of Environmental Protectio n • Division of Air Quality Approved: April 13, 2010 

### APPENDIX A

45CSR10 Monitoring Plan