U.S. Environmental Protection Agency
Office of Mobile Sources

February 5, 1996
updated 12/17/98

TO:  PART5 Users


     Attached is the agenda from the PART5 Workshop given in Denver, 
Colorado on November 8, 1995.  The handouts of all presentations are
available on the web at http://www.epa.gov/oms/models/part5.htm. 

     Also attached is the PART5 Workshop participants needs and 
recommendations, which were given during the wrap-up session of the 
workshop.  We will try to place emphasis on these items as further 
developments and improvements are made to the model.

     We welcome any comments from PART5 model users on aspects of the 
model that you consider important for review and/or development.



                                  Agenda
                                    
                    PART5 Workshop - November 8, 1995
                                    
                            USEPA Region VIII
                       999 18th Street, Suite 500
                            Denver, Colorado
                                    


9:00   * PART5/Exhaust, Brake & Tire-Wear 
  Connie Radwan

  - What it does, how it works; inputs, sensitivities

  - How it differs from old model

  - Development of tailpipe, brake-wear and tire-wear particulate 
    emission factors

10:15  Break

10:30  * Fugitive Dust

  Ron Myers

  - Describe how algorithms in AP42 were developed and explain when they 
    should be used

  - Inputs to PART5 model

  - Guidance on selecting silt loading

  - Future work and schedules, impact on PM10 and PM2.5

  - Schedule for changes or potential changes for PM10

12:00  Lunch

1:00   * Conformity
  Kathryn Sargeant

  - How does use of PART5 affect ability to stay within SIP PM10 budget?

  - Discussion of how previous SIPs were calculated

  - When must PART5 be used for conformity? (grace period)

2:00   * Wrap-up:
  - Summaries
  - Follow-ups



                        PART5 Workshop - November 8, 1995


Workshop Participant Needs and Recommendations:

Exhaust Emission Factor Issues:

  - Research on speed effects for diesel vehicles.
  - Research on high altitude effects for heavy duty diesel vehicles.


Fugitive Dust Issues:

  - As we do more fugitive dust studies, we should consider a broad 
    range of sites (i.e. include the east).

  - Encourage research on determination of the sources of re-entrained 
    dust (i.e. sand, tire- wear, etc).

  - Concern with the paved dust algorithm weight range, particularly the 
    high range.

  - Climate impact on fugitive dust emission factors.

  - Evaluate trade-offs from calculating fugitive dust emission factors 
    based on intersections vs. roadway segments.


User Guide Suggestions:

  - Emphasize importance of local silt loading in PART5 User's Guide and 
    guidance.

  - Reference and/or link the input variables in the PART5 User's Guide 
    with the AP42.

  - Have project level example analysis in the User's Guide.

  - Make the User's Guide more user-friendly.

  - Metric output option.