March 8, 1999

Document Released for Stakeholder Review and Comment

Update of Hot Soak Emissions Analysis

EPA Report Number EPA420-P-99-005
MOBILE Report Number M6.EVP.004

The Office of Mobile Sources, Assessment and Modeling Division
announces the release of "Update of Hot Soak Emissions Analysis"
for stakeholder review and comment.  This document is available
at the MOBILE6 section of the OMS Web Site
(http://www.epa.gov/oms/models.htm).

"Hot soak" emissions are evaporative hydrocarbon emissions from
vehicles in the hour after a trip's end. This document
incorporates the findings of two studies conducted by Automotive
Testing Laboratories, one on behalf of EPA., the other for
Oil/Auto Air Quality Improvement Research Program (AQIRP) to
develops hot soak emission estimates at low RVP values.  We
propose using these estimates in MOBILE6.

Comments on this report and its proposed use in MOBILE6 should be
sent to the attention of Terry Newell.  Comments may be submitted
electronically to mobile@epa.gov, by fax to 
(734) 214-4939, or to MOBILE6 Review Comments, US EPA Assessment
and Modeling Division, 2000 Traverwood Drive, Ann Arbor, MI
48105.  Electronic submission of comments is preferred.  In your
comments please note clearly the document you are commenting on
including the report title and the code number listed.  Please be
sure to include your name, address, affiliation and any other
pertinent information.

This document is being released and posted on March 8, 1999.
Comments will be accepted for sixty (60) days, ending May 7,
1999.  EPA will then review and consider all comments received
and will provide a summary of those comments and how we are
responding to them in a follow up document.

Thank you for your continuing interest in the development of
MOBILE6.

Sincerely,

Emission Inventory Group
Assessment and Modeling Division
US EPA
Office of Mobile Sources