U.S. Environmental Protection Agency


        Document Released for Stakeholder Review and Comment

      Evaluating Resting Loss and Diurnal Evaporative Emissions 
                   Using Real Time Diurnal Tests 

                   Report Number EPA420-P-99-026

     This report is a revision of a draft that was released for
stakeholder review on October 8, 1997.  The report numbering
convention was changed since the release of that earlier draft
which carried the document number M6.RTD.001.  Subsequent
versions of that earlier draft (including this version) will all
carry the document number M6.EVP.001 (i.e., the "RTD" was changed
to "EVP").  All versions of this report are entitled "Evaluating
Resting Loss and Diurnal Evaporative Emissions Using RTD Tests."

     This document reports both on the methodology used to
analyze the data from real-time diurnal (RTD) tests on 270
vehicles and on the results obtained from those analyses.  The
purpose of the analysis is to develop a proposal for a model of
the diurnal and resting loss emissions of the in-use fleet.  This
revised draft report incorporates suggestions received from
stakeholders during the 60-day review period.