UNITED
STATES
ENVIRONMENTAL
PROTECTION
AGENCY
National
Vehicle
and
Fuel
Emissions
Laboratory
2565
Plymouth
Road
Ann
Arbor,
Michigan
48105­
2498
May
19,
2004
MEMORANDUM
SUBJECT:
In­
Use
Testing
for
Heavy­
Duty
Diesel
Engines
and
Vehicles
 
Discussions
with
California
Air
Resources
Board
and
Engine
Manufacturers
Association
FROM:
Richard
S.
Wilcox

Richard
S.
Wilcox
Environmental
Scientist
Assessment
and
Standards
Division
THRU:
Gene
Tierney,
Director

Gene
Tierney
Air
Quality
and
Modeling
Center
Assessment
and
Standards
Division
TO:
Rulemaking
Docket,
OAR­
2004­
0072
On
February
19,
2004
a
meeting
was
held
among
representatives
of
the
EPA
and
Engine
Manufacturers
Association
(
EMA)
to
discuss
the
development
of
draft
regulations
to
establish
an
in­
use
testing
program
for
heavy­
duty
diesel
engines.
More
specifically,
the
protocol
for
determining
the
number
of
engine
families
that
may
be
designated
by
EPA
for
testing
each
year
was
discussed.
Those
present
and
their
affiliations
are
as
follows:

Gene
Tierney,
EPA
Rich
Wilcox,
EPA
Tim
French,
EMA
