July
29,
2004
Mr.
Larry
Dorsey
U.
S.
EPA
FIFRA
Science
Advisory
Panel
Arlington,
VA
Dear
Mr.
Dorsey,

The
enclosed
materials
support
the
Probabilistic
Exposure
and
Risk
Model
for
FUMigants
(
PERFUM),
which
is
scheduled
to
be
presented
to
the
SAP
on
August
24­
25,
2004.
The
package
includes
the
following
items:

 
A
report
describing
the
model
and
applying
it
to
iodomethane.
 
A
printout
of
the
computer
code
for
both
the
PERFUM
and
PERFUM_
MOE
programs.
 
A
CD­
ROM
containing
the
above
materials,
and
modeling
results
for
the
iodomethane
case
study.

The
directory
structure
of
the
CD­
ROM
is
as
follows:

The
FLUX
CALCULATION
folder
contains
a
spreadsheet
file
that
illustrates
the
calculation
of
flux
rate
estimates
from
field
measurements
and
modeling
results.

The
MODEL
folder
contains
separate
subfolders
for
the
PERFUM
and
PERFUM_
MOE
programs.
Each
of
these
Subfolders
contains
all
of
the
files
necessary
to
run
the
model.
A
detailed
description
of
those
files
can
be
found
in
the
user
manual.
In
addition
there
are
two
sets
of
example
input
files
that
can
be
used
to
run
the
model
in
each
folder.
The
example
files
are
for
a
5
and
10
acre
field
with
the
coarse
grid
coordinate
file.
For
users
interested
in
running
other
scenarios,
the
ISC
subdirectory
in
PERFUM
contains
example
ISCST3
input
files
for
the
10
possible
field
size
and
coordinate
file
combinations.

The
METEOROLOGICAL
DATA
folder
contains
the
files
that
were
used
to
process
the
raw
data
files
into
a
format
that
could
be
used
in
the
model.
The
FAWN­
Final
directory
contains
the
files
used
for
the
Bradenton
FAWN
data
and
the
ASOS­
Final
directory
contains
the
files
used
to
process
the
Bakersfield
CIMIS
data.

The
REPORT
folder
contains
copies
of
the
report
and
a
copy
of
this
memorandum.
The
MODELING
RESULTS
folder
contains
six
subfolders
representing
the
six
sets
of
flux
data
that
were
used
in
this
modeling
case
study
described
in
the
report.
Each
of
these
subfolders
contains
four
subfolders
that
represent
the
four
sets
of
meteorological
data
that
were
examined
in
this
case
study.
Each
of
these
folders
contains
all
of
the
input
and
output
files
from
the
PERFUM
model
runs.
Details
of
what
is
contained
in
each
file
can
be
found
in
the
user
manual
(
Appendix
A
of
the
report).

The
files
all
follow
an
8
character
naming
convention
that
identifies
the
flux
rate
data,
field
size,
and
meteorology
data
that
were
used
as
inputs.
The
first
two
characters
indicate
the
flux
data
that
was
used
(
i.
e.,
the
Arvesta­
sponsored
flux
study
where
the
flux
data
was
measured.

MN
Manteca
Flat
Fume
WF
Watsonville
Flat
Fume
OX
Oxnard
Raised
Bed
PR
Plant
City
Raised
Bed
LS
La
Selva
Beach
Drip
Irrigation
CD
Camarillo
Drip
Irrigation
The
third
and
fourth
characters
indicate
the
size
of
the
field
that
was
modeled.

01
1
Acre
Field
05
5
Acre
Field
10
10
Acre
Field
20
20
Acre
Field
40
40
Acre
Field
The
last
four
characters
indicate
the
meteorology
data
that
was
used.

BKAS
Bakersfield
ASOS
BDFW
Bradenton
FAWN
TLNW
Tallahassee
NWS
VTCM
Ventura
CIMIS
If
you
have
any
questions
regarding
this
submission,
please
contact
me
at
(
703)
684­
0123.

Sincerely,

Richard
Reiss,
Sc.
D.
Vice
President
cc:
Rick
Tinsworth
(
Exponent)
Laurent
Mezin
(
Arvesta)
Jim
Platt
(
Arvesta)
