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From: Coomes, Jamie <Jamie.Coomes@centuryaluminum.com>

Sent: Wednesday, April 08, 2015 10:44 AMTo: Hakos, MatthewCc: 'Putney, David'; Coomes, Brandon; Green, David A.Subject: RE: FW: Bag Leak Detection System Request

Sorry for any confusion on this. Potlines 1-4 do not have BLD because it is a wet scrubber system. Potline 5 has 6 baghouse modules each with BLD and 1 common exhaust stack with a particulate counter . 

Carbon Bake scrubber has 4 baghouse modules each with BLD and 1 common stack with a particulate counter. Paste Plant Pitch Fume Scrubber – Has no BLD Thanks Jamie 

From: Hakos, Matthew [mailto:mhakos@rti.org] Sent: Tuesday, April 07, 2015 12:10 PM To: Coomes, Jamie Cc: 'Putney, David'; Coomes, Brandon; Green, David A. Subject: RE: FW: Bag Leak Detection System Request Hey Jamie, Thank you for your reply. Just to be clear, can you please confirm that the paste plant and anode bake furnace stacks (for the two have BLDS and will not need BLDS in the future? I ask this because it looks like Century KY (paste plant) may have one stack without BLDS. Thanks you in advance, Matt From: Coomes, Jamie [mailto:Jamie.Coomes@centuryaluminum.com] Sent: Tuesday, April 07, 2015 1:01 PM 
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To: Hakos, Matthew Cc: 'Putney, David'; Coomes, Brandon Subject: FW: FW: Bag Leak Detection System Request Here is the info on Hawesville. From: Marksberry, James Sent: Tuesday, April 07, 2015 11:12 AM To: Coomes, Jamie Subject: RE: FW: Bag Leak Detection System Request 

Facility Name Sub-Category 

Paste Plant Anode Bake 

# of Paste 

Plant # of Stacks 

# of Stacks 

with existing 

BLDS 

# of Furnaces # of Sta

Alumax - Mt. Holly 

CWPB1 Yes (1) 1 1 Yes (1) 

Century Aluminum - Sebree 

CWPB1 Yes (1) Yes (1)

Century Aluminum of WV 

CWPB2 Yes (1) Yes (1)

Century Aluminum of KY 

CWPB3 Yes (1) 2 1 Yes (1) 

From: Coomes, Jamie Sent: Tuesday, April 07, 2015 8:16 AM To: Marksberry, James Subject: FW: FW: Bag Leak Detection System Request From: Courtney, Scott [mailto:Scott.Courtney@alcoa.com] Sent: Tuesday, April 07, 2015 7:46 AM To: Coomes, Brandon; Owens, Matt Cc: Coomes, Jamie; Wiggins, Rick Subject: RE: FW: Bag Leak Detection System Request 
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Brandon: Mt. Holly information is below. Our Bake Furnace Scrubber has a common stack, but a BLD unit is installed in the outlet of each o

compartments. Let me know if you have any other questions. Thanks, Scott E. Courtney, P.E. 

Environmental Manager PO Box 1000 Goose Creek, SC 29445 843.569.8606 (Office) 843.296.0220 (Cell) 843.572.5378 (Fax) scott.courtney@alcoa.com

From: Coomes, Brandon [mailto:Brandon.Coomes@centuryaluminum.com] Sent: Monday, April 06, 2015 12:09 PM To: Courtney, Scott; Owens, Matt (Century Aluminum) Cc: Coomes, Jamie; Wiggins, Rick Subject: EXT: FW: Bag Leak Detection System Request Importance: High Scott, Please see the email below from Mr. Hakos. Please complete the table below and I can submit after the whole table is co

Matt, Can you complete the section for Ravenswood? Thanks, Brandon Coomes 

Environmental Engineer, Sebree 9404 State Route 2096 Robards, KY 42452 270.521.7454 (Century Aluminum Sebree, LLC) 
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270.860.0057 (Mobile) brandon.coomes@centuryaluminum.comFrom: Hakos, Matthew [mailto:mhakos@rti.org] Sent: Monday, April 06, 2015 10:58 AM To: Coomes, Brandon; Coomes, Jamie Cc: Green, David A.; Putney, David Subject: Bag Leak Detection System Request Importance: HighJamie and Brandon, I am working with EPA regarding the bag leak detection system requirements for Primary Aluminum. Specifically, we are regarding the number of stacks associated with paste plants and anode bake furnaces. Could you please provide the numplant and anode bake furnace and indicate whether or not BLDS is (or is not) already installed. Please use the table below

Facility Name Sub-Category 

Paste Plant Anode Bake 

# of Paste 

Plant # of Stacks 

# of Stacks 

with existing 

BLDS 

# of Furnaces # of Sta

Alumax - Mt. Holly 

CWPB1 Yes (1) 1 1 Yes (1) 

Century Aluminum - Sebree 

CWPB1 Yes (1) Yes (1)

Century Aluminum of WV 

CWPB2 Yes (1) Yes (1)

Century Aluminum of KY 

CWPB3 Yes (1) Yes (1)

Thank you in advance for your assistance, Matt Hakos RTI International 3040 Cornwallis Road Research Triangle Park, NC 27709 (919) 541-6608