Mr. Gary

Barnett Director, Environmental Compliance & Audit Aleris International, Incorporated 25825 Science Park Drive, Suite 400 Beachwood, O hio 44122

- 7392 Dear Mr. Barnett : Thank y ou for y our efforts in assisting with the March 16, 2010 , site visit by U.S. Environmental Protection Agency (EPA) and R T I personnel to the Aleris International facility in Morgantown, Kentucky . We appreciate the time that you and other representatives at Aleris International set aside for dis cussing and showing your manufacturing process. Enclosed is a draft of the trip report (Enclosure 1) that has been prepared based on the information obtained during our site visit. We would appreciate your reviewing the report for any errors or omissions . You may return the enclosed copy of the report with y our written comments. Since this report will eventually become a part of the public record, we want to portray y our operations as accuratel y as possible. A cop y of the final version of the report incor porating your comments will be sent to you for your records. The custod y receipt for the trip report is also enclosed (Enclosure 2). Please sign and date the form to acknowledge receipt of the report and return a cop y of the form to: Mr. Roberto Morale s ; U.S. EPA Mailroom (C404

- 02); U.S. Environmental Protection Agency ; Office of Air Quality

Planning and Standards; 109 T.W. Alexander Drive ; Research Triangle Park, NC 27711

. If you believe that disclosure of an y specific information contained in the trip report would reveal trade secrets or other confidential information, you should clearly identify the specific information. Please do not label the entire report as “confidential” if only certain portions consist of trade secret information. If the EPA determines that there is a need to disclose such information, we will need, at that time, the following to support y our claim: 1. Measures taken b y Aleris International to guard against undesired disclosure of the specific information to others; 2. The extent to which the specific information has been disclosed to others and the precautions taken in connection therewith;OAQPS/SPPD/MMG:RBo yd D243

- 02, 541

- 1390

(RTI/DGreen/316

- 3412/ 7 / 22 /10) 3. Pertinent confidentiality determinations, if an y, by other Federal agencies (furnish a copy of any such determination, or referen ce to it, if available); and 4. Whether Aleris International asserts that disclosure of the specific information would be likely to result in substantial harmful effects on Aleris International ’s competitive position, and, if so, what those harmful effec ts would be, why they should be viewed as substantial, and an explanation of the causal relationship between disclosure and such harmful effects. Any specific information subsequently determined to constitute a trade secret will be protected under 18 U.S .C. 1905. If no claim of confidentiality accompanies the information when it is received b y EPA, it may be made available to the public by EPA without further notice (40 CFR Part 2.203, September 1, 1976). Any specific information subsequently determined t o constitute a trade secret will be protected under 18 U.S.C. 1905. However, all emissions data will be available to the public. A clarification of the information EPA considers to be emissions data is contained in Enclosure 3. We respectfull y request th at you submit y our review comments on the trip report by August 2 6 , 20 10 . If y ou concur with the information contained in the report, we would appreciate a letter to that effect. In addition, please indicate in your letter the specific parts of the report, if an y, that Aleris International considers to be confidential. If we do not receive a response b y August 26 , 20 10 , the report will be considered non

- confidential and accurate. Thank y ou for y our cooperation. The information supplied by Aleris Internati onal will be most helpful in our study. If you have an y questions, please call M s . Rochelle Bo yd of m y staff at (919) 541

- 1390 , or Mr. David Green at RTI at (919) 316

- 3412
. Sincerel y,

S usan Fairchild Group Leader Metals and Minerals Group Office of Ai r Quality

Planning and Standards 3 Enclosures