Technical Letters & Responses
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
Companies participating in the HPV Challenge Program who had specific technical questions about either their participation in or the conduct of the program itself submitted "technical letters" to the Agency with their questions from 1998 through 2005. Those letters and EPA's responses were posted on this page for the duration of the HPV Challenge Program. Because these letters were no longer being accessed due to their age, they were removed from this site in May 2012 and placed in the docket for the HPV Challenge Program, AR-201.
A complete copy of the technical correspondence is available in PDF format on CD-ROM from the Office of Pollution Prevention and Toxics (OPPT) Docket Center. You can obtain a copy without charge by contacting the Docket Center by email at email@example.com or by telephone at 202-566-0280 and requesting file number AR201-16873.