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From: Putney, David
Sent: Wednesday, December 18, 2013 9:39 AM
To: Coomes, Brandon; Coomes, Jamie; Sean T. Lane Subject: Draft emissions file for the Century Aluminum faci lities

Hello Jamie/Brandon/Sean,

Please find attached to this message a draft emissi ons file (Excel spreadsheet) for the Century Aluminum primar y aluminum production facilities. Columns highlighte d in yellow are available for revisions or to indicate i f
records should be deleted. Please do not overwrite the data in columns that are not highlighted in yellow as this would complicate the development of the final emiss ions file for use in risk modeling.

The tab titled “primary Al category” includes emiss ions from the primary aluminum production operations (e. g., potlines, paste plants, pitch storage tanks, and an ode bake furnaces) at the Century Aluminum facilities as est imated via emission factors developed from test results ob tained in response to the testing ICR sent out in April of 2013. I expect that the stack parameters are correct as-is since industry previously had opportunity to review those items
in CY2010 before the initial residual risk and tech nology review (RTR) proposal for the primary aluminum prod uction source category. There are, however, some emissions (e.g., metal HAP, dioxins, PCB, etc.) that are new to the RTR analysis for the primary aluminum production source category and, although these have been QA/QC’d by contractor and EPA staff, we do welcome feedback/corrections you might have on these emissi ons. A revision column highlighted in yellow is provided f or you to revise emissions (in units of tons per year, tpy ) if

needed.

The tab titled “noncategory” includes 2005 NATA NEI , 2008 NEI and 2010 state HAP data for the Century Aluminu m primary aluminum production facilities. These recor ds are intended to include emissions from operations at yo ur facility which are not directly associated with pri maryp. 2 of 3

aluminum production (primary aluminum emissions are addressed under the first tab, discussed above) or secondary aluminum production (secondary aluminum e missions
will be addressed via the RTR associated with the s econdary aluminum source category). Revision columns highlig hted in yellow are included for emissions, pollutants, stac k parameters, fugitive parameters and latitude/longit ude. If any of these parameters needs modification, please put the corrected value in the associated revision column ( again, please do not overwrite the data in columns that ar e not highlighted in yellow). Note that fields were also added to identify if a record should be deleted, and a re viewer comment field where you can add a comment if approp riate. Please review these data with the following in mind :

1. Should the operation be included in the spreadsheet ?

a. Does the operation still exist at the facility? If not, or if it exists but is not legally allowed to operate (e.g., you do not have a valid operating pe rmit for this operation) then the operation
and associated emissions need not be included.

b. If the operation does exist at the facility, is it part of any secondary aluminum operations that may exist at your facility? If so, then the operati on and associated emissions need not be included (so as to avoid double counting those emis sions).

c. If the operation does exist at the facility, would the emissions from this operation be considered part of the monitored primary aluminum e missions? For example, if the emissions associated with the operation in question are route d through the control device associated with the paste plant and would be monitored as part of the paste plant emissions then the operation and associated emissions need not be incl uded (so as to avoid double counting those emissions).

2. If the operation should be included, are the cited emissions representative of that operation?

3. If the operation should be included but the cited emissions are not representative of that operation, then please provide representative annual actual em issions in units of tons emitted per year (tpy).

4. Verify or modify the stack parameters and location as appropriate and necessary.

If I might make a suggestion – you can use the filt er function in Excel to narrow down the file to review a single facility at a time.p. 3 of 3

I do not have any information for a contact at the Century Aluminum facility in West Virginia. Would you pleas e pass this email and attachment along to someone at that facility that could review this information? Also, would you please forward me that person’s contact information?

Please provide any comments, changes, corrections, etc. to this file to me by close of business on Friday, 01/ 03/14. I understand that more time might be preferable with the holidays upon us, but please give me what you can b y 01/03/14 and remember that you will have another opportunity to make comments and corrections during the upcoming public notice and comment period associate d with the primary aluminum production RTR supplemental pr oposal.

If you have any questions concerning these issues, please feel free to contact me by email or telephone.

Thanks,

David Putney, Environmental Engineer U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Sector Policies and Programs Division 109 T.W. Alexander Drive, RTP, NC 27711 Mail Drop D243-02 Ph: (919) 541-2016 Fax: (919) 541-3207
Email: putney.david@epa.gov