An equal opportunity employer

1220 L Street, Northwest Russell White

Washington, DC 20005-4070 Health Sciences Manager

Tel 202-682-8344

Fax 202-682-8270

whiter@api.org

August 1, 2012

Byron J. Bunker,

Acting Division Director

Compliance Division

Office of Transportation and Air Quality US Environmental Protection Agency 

2000 Traverwood Drive

Ann Arbor, Michigan 48105

RE: Interim Report # 23 – Fuels and Fuel Additives Health Effects Testing Regulation; 

Pursuant to Section 211(b)(2) and 211(e) of the Clean Air Act.

Dear Mr. Bunker:

The American Petroleum Institute (API), on behalf of the Section 211(b) Research Group is 

submitting this interim report on the progress and status between 01 January 2012 and 01 July 

2012 of the testing program set forth in the Alternative Tier 2 provisions of the testing regulation.

1. Toxicology Testing1

Baseline Gasoline Vapor Condensate:

 Subchronic study (with GFAP, genotoxicity, immunotoxicity, and neurotoxicity assays) –

The final report was submitted to EPA 05 July 2007.

 Two-generation reproductive study – The final report was submitted to EPA 23 January 

2009. 

 Rat and mouse developmental toxicity studies – The rat final report was submitted to 

EPA 11 August 2008. The mouse final report was revised and resubmitted to EPA 23 

November 2009.

 Chronic study – The final report was submitted to EPA 16 June 2010. 

Gasoline/MTBE Vapor Condensate:

 Subchronic study (with GFAP, genotoxicity, immunotoxicity, and neurotoxicity assays) 

– The final report was submitted to EPA 14 September 2007.

 Two-generation reproductive study – The final report was submitted to EPA 07 July 

2011. 

 Rat and mouse developmental toxicity studies – The final report of the rat study was 

submitted to EPA 07 July 2009. The mouse final report was submitted to EPA 04 June 

2009. The final report of the repeat mouse study was submitted to EPA 06 May 2010.

 Chronic study – The final report was submitted to EPA 16 June 2010. A report 

amendment was submitted to EPA on 21 April 2011.

 

1 All studies were conducted in rats, unless otherwise noted
August 1, 2012

Page 2 of 3

Gasoline/Ethanol Vapor Condensate:

 Subchronic study (with GFAP, genotoxicity, immunotoxicity, and neurotoxicity assays) 

–The final report was submitted to EPA on 24 February 2010. 

 One-generation reproductive toxicity study – The final report was submitted to EPA 29 

May 2009.

 Developmental toxicity study -The final report was submitted to EPA 10 December 

2008.

Gasoline/TAME Vapor Condensate:

 Subchronic study (with GFAP, genotoxicity, immunotoxicity, and neurotoxicity assays) 

– The final report was submitted to EPA on 27 December 2011. 

 One-generation reproductive study - The final report was submitted to EPA 29 May 

2009. 

 Developmental toxicity study – The final report was submitted to EPA 17 December 

2008.

Gasoline/ETBE Vapor Condensate:

 Subchronic study (with GFAP, genotoxicity, immunotoxicity, and neurotoxicity assays) 

– The final report was submitted to EPA on 23 March 2011.

 One-generation reproductive study – The final report was submitted to EPA 06 May 

2010.

 Developmental toxicity study – The final report was submitted to EPA 17 December 

2008.

Gasoline/DIPE Vapor Condensate:

 Subchronic study (with GFAP, genotoxicity, immunotoxicity, and neurotoxicity assays) 

– The second draft was submitted to EPA 25 April 2012.

 One-generation reproductive study - The final report was submitted to EPA 02 

September 2011.

 Developmental toxicity study – The second draft was submitted to EPA 25 April 

2012.

Gasoline/TBA Vapor Condensate:

 Subchronic study (with GFAP, genotoxicity, immunotoxicity, and neurotoxicity assays) 

– The second draft was submitted to EPA 25 May 2012.

 One-generation reproductive study - The final report was submitted to EPA 02 

September 2011.

 Developmental toxicity study - The final report was submitted to EPA 16 October 2009.

Pharmacokinetic Studies on DIPE, ETBE, and TBA:

 ETBE – Preparation of the first draft report was in progress.

 DIPE – The definitive study protocol was in finalized and the in-life studies were 

initiated in December 2011.

 TBA – Preparation of the final report for the pilot study was in progress.
August 1, 2012

Page 3 of 3

2. Exposure Screening Studies

The report entitled “Section 211(B) Tier 2 High End Exposure Study of Conventional and 

Oxygenated Gasoline” and previously submitted associated materials were accepted by EPA on 

19 May 2010. A compiled version of the final report was submitted to EPA on 10 June 2011, 

completing the Section 211(B) Tier 2 exposure screening study requirements.

Sincerely,

Russell White, Ph.D.

Health Sciences Manager

cc: Joe Sopata, EPA (via email)