Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Guidance for the use of latest planning assumptions in transportation conformity determinations : revision to January 18, 2001 guidance memorandum /
CORP Author United States. Environmental Protection Agency. Office of Transportation and Air Quality.
Publisher U.S. Environmental Protection Agency, Office of Transportation and Air Quality, Transportation and Regional Programs Division,
Year Published 2008
Report Number EPA 420-B-08-901
Stock Number PB2010-108642
OCLC Number 304506191
Subjects Transportation and state--United States. ; Transportation--Planning. ; Transportation--Environmental aspects. ; Air--Pollution--United States--States. ; Air--Pollution--U.S. states.
Additional Subjects Environmental protection ; Air quality standards ; Transportation planning ; Conformity ; Clean Air Act ; Air pollution control ; Regulations ; Public health ; State agencies ; Local agencies ; Employment ; Population ; Vehicle registartion ; Long range planning ; Implementation
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ELCD  EPA 420-B-08-901 PDF file on file NVFEL Library/Ann Arbor, MI 12/31/2012
NTIS  PB2010-108642 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/13/2011
Collation 1 online resource (ii, 19 pages)
The Clean Air Act requires that transportation investments be based on the most recent information that is available in order to protect public health over the long-term. As such, conformity determinations must be based upon the most recent planning assumptions in force at the time the conformity analysis begins (40 CFR 93.110(a)). The Environmental Protection Agency (EPA) and Department of Transportation (DOT) encourage state and local agencies to review and update their planning assumptions regularly. Areas are strongly encouraged to review and update planning assumptions at least every five years, especially population, employment, and vehicle registration assumptions. Areas with network-based travel models should review their assumptions and data used in model validation through the consultation process, and newer assumptions and data must be used whenever available. Conformity determinations that are based on assumptions that are older than five years should include written justification for not reviewing and updating assumptions at least every five years.
Title from title screen (viewed Feb. 12, 2009). Appendix B is on a World document accessible from the website. "December 2008." Includes bibliographical references. "EPA420-B-08-901."
Contents Notes
This guidance document supersedes the January 18, 2001 guidance memorandum to address the July 1, 2004 transportation conformity final rule revisions on the use of latest planning assumptions in transportation conformity determinations.