Frames/
3MRA
March
3,
2003
The
Frames/
Multimedia,
Multipathway
and
Multireceptor
Risk
Assessment
(
3MRA)
Model
is
a
exposure
and
risk
assessment
modeling
system.

Purpose:
The
3MRA
model
was
developed
to
perform
a
site­
based
national
assessment
of
human
and
ecological
risks
posed
by
the
disposal
of
industrial
wastes
in
land­
based
units
(
surface
impoundments)
to
support
the
Hazardous
Waste
Identification
Rule
(
HWIR).
To
address
multiple
exposure
simultaneously,
the
3MRA
Model
includes
17
functional
modules.
The
model
is
undergoing
SAB
review
this
Spring.
The
3MRA
model
was
developed
with
the
intention
of
broad
application
above
and
beyond
HWIR,
and
is
a
potentially
valuable
risk
analysis
tool
for
the
planning
process.

Contact:
Gerry
Laniak
(
706)
355­
8316;
Justin
Babendreier
(
706)
355­
8344;
Karl
Castleton
Short­
term
followup:
Meet
with
3MRA
staff
to
determine
whether
this
model
can
be
used
as
a
screening
level
tool
for
identifying
national­
level
concerns
or
trends
in
human
health
and
the
environment.
A
better
understanding
of
the
tool
is
needed
to
answer
questions
including
defining
the
multireceptors
(
ecological,
human),
needed
data
inputs,
and
how
to
validate
the
results.

Long­
term
followup:
Discuss
with
3MRA
staff
the
possibility
of
using
this
model
system
for
industry­
specific
exposure
and
risk
assessment
to
support
the
more
detailed
investigation
phase
of
the
304(
m)
planning
process.
