January
27,
1999
MEMORANDUM
SUBJECT:
REVISED
EXPOSURES
TO
DDVP
RESULTING
FROM
THE
USE
OF
BAIT
PRODUCTS
(
PC
Code
084001,
Barcode
D251336)

FROM:
David
Jaquith
Chemistry
and
Exposure
Branch
2
Health
Effects
Division
(
7509C)

TO:
Jess
Rowland
Risk
Characterization
and
Analysis
Branch/
RRAB3
Health
Effects
Division
(
7509C)

THRU:
Sue
Hummel,
Branch
Senior
Scientist
Chemistry
and
Exposure
Branch
2
Health
Effects
Division
(
7509C)

In
April
1998
HED
produced
a
document
estimating
the
exposures
of
individuals
using
bait
products
containing
DDVP
(
1).
Bait
products
are
usually
applied
directly
as
granules
or
dissolved
in
water
to
produce
a
syrup
which
is
either
sprayed
or
painted
on
surfaces.
They
may
also
be
applied
in
the
form
of
bait
stations
in
which
the
material
is
applied
to
absorbent
material
and
placed
at
locations
throughout
the
facility.
The
products
are
used
in
agricultural
or
other
commercial
applications
for
fly
control
in
the
outdoor
environment
or
in
indoor
cattle
or
batteried
poultry
facilities.

HED
has
no
data
directly
measuring
the
exposures
of
individuals
applying
dry
bait
products
containing
DDVP
and
therefore
used
data
from
the
Pesticide
Handler
Exposure
Database
(
PHED
V1.1)
which
contained
a
single
study
(
Number
520)
that
addresses
that
hand
application
of
granular
products.
Examination
of
the
Summary
Statistics
table
indicated
that
virtually
all
of
the
measurements
for
these
calculations
found
no
detectable
pesticide.
While
the
level
of
detection
for
DDVP
is
different
from
that
of
the
surrogate
chemical
it
was
judged
that
any
attempt
to
calculate
an
exposure
number
based
on
almost
all
non
detected
samples
would
be
completely
artifactual
and
based
only
on
the
relative
detection
limits.
Application
of
these
granular
products,
while
wearing
protective
gloves,
was
judged
to
result
in
negligible
exposure.
HED
noted
that
the
labels
do
not
specify
protective
gloves
during
application.
This
requirement
should
be
added
to
the
label
and
the
above
assumption
is
not
valid
D251336
Page
2
unless
this
label
change
is
made.

HED
also
reconsidered
the
potential
exposures
from
the
application
of
liquid
bait
formulations.
Upon
further
evaluation
and
consultation
with
OPP
experts,
it
was
concluded
that
there
were
no
suitable
data
with
which
to
calculate
a
reliable
exposure
assessment
for
liquid
bait
products
and
that,
given
the
more
directed
and
localized
application
procedures
for
such
products,
the
exposures
would
not
exceed
those
from
application
directly
to
animals
or
to
animal
facilities
(
2).

REFERENCES
1)
Memorandum
from
D.
Jaquith
(
CEB2)
to
C.
Scheltema
(
RCAB)
titled
"
Exposures
to
DDVP
From
The
Use
of
Bait
Products
(
PC
Code
084001,
Barcode
246128)"
dated
April
28,
1998.

2)
Memorandum
from
D.
Jaquith
(
CEB2)
to
C.
Scheltema
(
RCAB)
titled
"
Revised
Exposures
to
Dichlorvos
(
DDVP)
Resulting
From
Dairy
Barn
and
Animal
Spray
Uses
(
PC
Code
084001,
Barcode
251330)"
dated
December
3,
1998.
Currently
undergoing
internal
HED
Review.

cc:
Dichlorvos
file
(
084001)
Correspondence
file
