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

Sent: Tuesday, April 14, 2015 7:29 AMTo: Hakos, MatthewCc: 'Putney, David'; Green, David A.; Coomes, JamieSubject: RE: FW: Bag Leak Detection System RequestAttachments: Alcan Sebree PM_CO Report 2010.pdf

Matt, You are correct. Attached is the 2010 Test Report. I’ll send you the 2012 and 2014 test reports shortly. Thanks, Brandon Coomes Environmental Engineer, Sebree 9404 State Route 2096 Robards, KY 42452 270.521.7454 (Century Aluminum Sebree, LLC) 270.860.0057 (Mobile) brandon.coomes@centuryaluminum.comFrom: Hakos, Matthew [mailto:mhakos@rti.org] Sent: Monday, April 13, 2015 3:28 PM To: Coomes, Brandon Cc: 'Putney, David'; Green, David A.; Coomes, Jamie Subject: RE: FW: Bag Leak Detection System RequestBrandon, Based on the comments submitted by Century, it is my understanding that we should multiply each run by three, then take the avactually results in the same answer, but is consistent with the approach we use to determine averages for the MACT floors. Can ycorrect? 
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2010 

0.003 0.003 0.041 0.047 Sum0.009 0.009 0.123 0.047 Average

2012 

0.022 0.181 0.026 0.229 Sum0.066 0.543 0.078 0.229 Average

2013 

0.033 0.008 0.071 0.112 Sum0.099 0.024 0.213 0.112 Average

2014 

0.002 0.002 0.019 0.023 Sum0.006 0.006 0.057 0.023 Average

This results in the overall average shown below. 

Mean Unit Of Measure 1 2 3 4 5 6 7 8 9 10 

0.1028 lb/ton anode 0.009 0.009 0.123 -- -- -- 0.066 0.543 0.078 0.099 

Also, can you all provide the pdf’s of these test reports so that we can confirm the results? We greatly appreciate your efforts. 

Thank you in advance, Matt 

From: Coomes, Brandon [mailto:Brandon.Coomes@centuryaluminum.com] Sent: Monday, April 13, 2015 2:53 PM To: Hakos, Matthew Cc: 'Putney, David'; Green, David A.; Coomes, Jamie Subject: RE: FW: Bag Leak Detection System Request Matt, We do have some PM test data for Sebree: 2010 Run #1 = 0.003 lb/ton Run #2 = 0.003 lb/ton Run #3 = 0.041 lb/ton Scrubber Total = 0.047 lb/ton green anode 

2011 No data available 
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2012 Run #1 = 0.022 lb/ton Run #2 = 0.181 lb/ton Run #3 = 0.026 lb/ton Scrubber Total = 0.229 lb/ton green anode 

2013 Corrected ICR Data Run #1 = 0.033 lb/ton Run #2 = 0.008 lb/ton Run #3 = 0.071 lb/ton Scrubber Total = 0.112 lb/ton green anode 

2014 Run #1 = 0.002 lb/ton Run #2 = 0.002 lb/ton Run #3 = 0.019 lb/ton Scrubber Total = 0.023 lb/ton green anode* 

*Please note the 2014 PM emissions results are atypical and well below the RY2010 - RY2014 average result of 0.10 lb/ton gree

The anode bake furnace scrubber exhausts to three separate stacks. PM emissions were summed from all three test runs in order 

emission rate of the scrubber. Please let me know if you need anything else. Brandon Coomes 

Environmental Engineer, Sebree 9404 State Route 2096 Robards, KY 42452 270.521.7454 (Century Aluminum Sebree, LLC) 270.860.0057 (Mobile) brandon.coomes@centuryaluminum.comFrom: Hakos, Matthew [mailto:mhakos@rti.org] Sent: Friday, April 10, 2015 10:39 AM To: Coomes, Jamie Cc: 'Putney, David'; Coomes, Brandon; Green, David A. Subject: RE: FW: Bag Leak Detection System RequestJamie and Brandon, Thank you for your help thus far. I have one more request for data regarding PM data for the anode bake furnaces at Sebree. Do 

that you could provide to us. We were thinking that PM test data may be available through the annual TF testing that is performe

the TF test reports for RY2010 – RY2014? If this data is not available, please let us know and we will document and close the doo
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Thank you in advance for your continued assistance.Matt Hakos From: Coomes, Jamie [mailto:Jamie.Coomes@centuryaluminum.com] Sent: Wednesday, April 08, 2015 10:44 AM To: Hakos, Matthew Cc: '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 num

plant 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