Text of Slides from Presentation
by Kathyrn Sargeant, EPA/OMS
at the Denver PART5 Workshop, 
November 1995

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                                 PART5

                                  AND

                            TRANSPORTATION
                              CONFORMITY

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                         Why Does PART5 Affect
                              Conformity?

         --  Conformity rule requires estimates of PM-10
             emissions from transportation plans and TIPs

         --  Plan/TIP emissions must be less than or
             equal to SIP projections

               "Motor vehicle emissions budget"

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                   Why Does PART5 Affect
                         Conformity?

         --  Clean Air Act requires conformity analyses to
             use "most recent" estimates and assumptions

         --  Plan/TIP emissions must be estimated using "most
             current version of the motor vehicle emissions
             model specified by EPA for use in preparing or
             revising SIPs"

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                     Implications for Conformity:

               Are transportation plan/TIP emissions
                      estimated using PART5
              still within the SIP's emissions budget?

            --  What emission factors is the SIP's budget
                based on?  How do they differ from PART5?

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                    Implications for Conformity:

                 What if the plan/TIP cannot pass the
                  budget test when PART5 is used?

                              OPTIONS:

        --  Modify plan/TIP

        --  Submit revised attainment demonstration to EPA,
            including new modeling, control measures as necessary

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                           SIP Revisions
                       for Conformity Purposes

     If the PM-10 attainment demonstration has been approved by
     EPA, its budget cannot be changed without a SIP submission
     and EPA approval.

     If the PM-10 attainment demonstration has been submitted to
     EPA but not yet approved, its budget can be changed by
     submitting a revised attainment demonstration.  EPA
     approval would not be required.

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                      When Must Conformity
                   Analyses Start Using PART5?

       --  Not required until after Federal Register announcement

       --  Federal Register announcement will establish grace period

       --  Grace period will be at least 3 months and no
           longer than 2 years.

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                        Alternatives to PART5
                           for Conformity

       --  Work with EPA Regional Office and other consulting agencies

       --  If local alternatives approved for use in SIP
           preparation, should be acceptable for conformity purposes

       --  Local data encouraged

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                      PM-10 Hot-Spot Analysis

       --  PM-10 hot-spot analysis not currently required

       --  Dispersion modeling methodology still being developed

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