Reports from the Work Groups of the Mobile Sources Technical Review Subcommittee

for the MSTRS meeting of April 18, 2001

Modeling - Gene Tierney, (734) 214-4456, tierney.gene@epa.gov

Since the January MSTRS meeting, EPA has developed an issue paper containing an initial proposal
for the New Generation Mobile Source Emissions Model. This initial proposal was presented to the
modeling workgroup during a meeting on April 10th. The workgroup will not be meeting on April
18 as previously planned but will be having a conference call on April 23. Contact Gene Tierney for
further details on the call.

Air Toxics - Drew Kodjak, (734) 214-4804, kodjak.drew@epa.gov

No activity since the January meeting. The Air Toxics WG is planning to hear a presentation on the
National Air Toxics Assessment and a discussion of mobile source air toxics.

On-Board Diagnostics (OBD) - Ed Gardetto, (734) 214-4322, gardetto.edward@epa.gov
The workgroup met after the last MSTRS meeting in Alexandria, Virginia. At this meeting the
group discussed a recommendation that EPA should continue to monitor the OBD technology as it
ages. This would be accomplished by screening a random sample of vehicles at an I/M lane and
performing a transient mass based test to form an emissions profile of this fleet. Additional FTP
based testing is recommended for any vehicles which indicate OBD errors of omission. The group
also was presented the status of the Colorado Department of Health and ESP testing program being
conducted on OBD equipped vehicles. The group plans on following this testing as it continues (25
or 100 completed at this time). The workgroup has also identified the area of scanware compatibility
as an area which need attention. The group has formed a subgroup which is investigating this area.
At the next workgroup meeting, April 19, 2001, the group plans on adopting the OBD monitoring
recommendation and discussing how the scanware group is progressing. The workgroup will also
have an open discussion of any areas which members feel need to be addressed by the group.

Nonroad Workgroup - Glenn Passavant, (734) 214-4408, passavant.glenn@epa.gov.

The Nonroad workgroup had its second meeting on April 12 in Chicago. The meeting was attended
by 23 parties representing all key stakeholder groups. Significant progress was made in identifying
what issues would need to be resolved in any future nonroad rule efforts for large nonroad land-
based diesel engines and equipment. Both the oil and engine industry representatives stressed the
importance of quick action by EPA if a rule is being considered for the future. Both industries are in
the midst of capitol investment decisions for 2006, and need to know if new or changed requirements
are coming. The group also laid out ideas and issues with regard to how future low sulfur diesel
might be provided for nonroad diesels, how the environmental benefits could be assured during
program implementation, engine and equipment issues for after treatment type standards and when
these might be implementable. The representatives uniformly expressed an interest in providing
EPA specific recommendations on how to move forward. The next meeting of the group is June 12
in Chicago.


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