Approaches for the Application of Physiologically-Based Pharmacokinetic (PBPK) Models and Supporting Data in Risk Assessment

Rick_Becker@americanchemistry.com 08/08/2005 08:31 AM To: Peter Preuss/DC/USEPA/US@EPA cc: Docket ORD@EPA, NCEADC.Comment@epamail.epa.gov, Chad Thompson/DC/USEPA/US@EPA Subject: Request to extend comment period - Docket ID No. ORD-2005-0022 Dr. Peter Preuss Director, National Center for Environmental Assessment USEPA Headquarters Ariel Rios Building 1200 Pennsylvania Avenue, NW Mail Code: 8601D Washington, DC 20460 RE: Approaches for the Application of Physiologically Based Pharmacokinetic (PBPK) Models and Supporting Data in Risk Assessment. 70 FR 43692. 7/28/2005. Docket No. ORD-2005-0022 Dear Dr. Preuss, Please see the attached letter. The American Chemistry Council requests that the comment period for the above referenced document be extended by an additional 45 days. (See attached file: Request for Extension of Comment Period PBPK Guidance.pdf) Thank you for considering this request Richard A. Becker, Ph.D. DABT American Chemistry Council (703) 741-5210 (703) 741-6056 (fax) e-mail: Rick_Becker@americanchemistry.com - Request for Extension of Comment Period PBPK Guidance.pdf Please see ORD-2005-0022-0005 for the remainder of this comment.

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