Document ID: EPA-HQ-OPP-2006-0333-0011
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2006-08-28T04:00Z

Felicia
Fort/
DC/
USEPA/
US
07/
31/
2006
02:
14
PM
To
Barbara
Madden/
DC/
USEPA/
US@
EPA
cc
bcc
Subject
Fw:
129111
D330783:
Kresoxim­
methyl
Drinking
Water
Assessment
[
Second
revision]

FYI...

Felecia
A.
Fort,
acting
Chief
Registration
Action
Branch
1
Health
Effects
Division
Office
of
Pesticide
Programs
Environmental
Protection
Agency
(
703)
305­
7478
Insight,
I
believe,
refers
to
the
depth
of
understanding
that
comes
by
setting
experiences,
yours
and
mine,
familiar
and
exotic,
new
and
old,
side
by
side,
learning
by
letting
them
speak
to
one
another.
­
Mary
Catherine
Bateson
­­­­­
Forwarded
by
Felicia
Fort/
DC/
USEPA/
US
on
07/
31/
2006
02:
11
PM
­­­­­
Roxolana
Kashuba/
DC/
USEPA/
US
07/
31/
2006
12:
35
PM
To
Sarah
Levy/
DC/
USEPA/
US@
EPA
cc
Felicia
Fort/
DC/
USEPA/
US@
EPA,
Pv
Shah/
DC/
USEPA/
US@
EPA,
RDavid
Jones/
DC/
USEPA/
US@
EPA,
Betsy
Behl/
DC/
USEPA/
US@
EPA
Subject
Re:
129111
D330783:
Kresoxim­
methyl
Drinking
Water
Assessment
[
Second
revision]

Sarah;

After
senior
scientist
review,
we
noticed
that
the
metabolite
was
being
modelled
using
a
300­
day
input
parameter
(
supposedly
from
a
100
day
half­
life
times
3
to
account
for
uncertainty),
however,
the
study
itself
never
calculated
a
half­
life
for
the
metabolite,
just
reporting
it
as
>>
100
days.
This
means
the
half­
life
could
actually
be
much
longer
than
100
days.
In
the
absence
of
data,
therefore,
we
assumed
that
the
metabolite
was
stable
to
aerobic
soil
metabolism
and
re­
modelled
the
numbers.
This
is
explained
on
page
3
of
the
revised
drinking
water
assessment,
as
follows:

The
aerobic
aquatic
metabolism
input
value
for
the
degradate
is
assumed
stable
(
as
the
two
available
half­
lives
are
reported
only
as
>>
100
days).
[
The
aerobic
aquatic
metabolism
degradate
input
value
has
been
changed
from
the
input
value
used
in
previous
kresoxim­
methyl
assessments
(
300
days).
The
assumption
of
degradate
stability
to
aerobic
aquatic
metabolism,
however,
only
increased
surface
water
drinking
water
concentrations
by
1­
23%.
For
chemicals
with
half­
lives
longer
than
the
reservoir
turnover
rate
(
approximately
three
times
a
year),
reservoir
turnover
decreases
DWECs
via
dissipation
more
than
degradation
decreases
DWECs.
Sarah
Levy/
DC/
USEPA/
US
07/
31/
2006
07:
48
AM
To
Roxolana
Kashuba/
DC/
USEPA/
US@
EPA
cc
Felicia
Fort/
DC/
USEPA/
US@
EPA,
Pv
Shah/
DC/
USEPA/
US@
EPA
Subject
Re:
129111
D330783:
Kresoxim­
methyl
Drinking
Water
Assessment
[
Second
revision]

Hi
Roxolana
­
these
#'
s
(
particularly
the
metabolite
#
s)
are
different
than
the
#
s
you
sent
us
on
July
17.
What's
the
reason
for
the
discrepency?

Thanks!

+++++++++++++++++++++++++++++
Sarah
Levy,
Chemist
RAB1/
HED/
OPP/
OPPTS/
US
EPA
Telephone:
703­
305­
0783
Cubicle:
S10953
Roxolana
Kashuba/
DC/
USEPA/
US
07/
28/
2006
03:
57
PM
To
OPP
EFED
Tracking
Team
cc
Tamue
Gibson/
DC/
USEPA/
US@
EPA,
Mary
Waller/
DC/
USEPA/
US@
EPA,
Sarah
Levy/
DC/
USEPA/
US@
EPA,
RDavid
Jones/
DC/
USEPA/
US@
EPA,
Betsy
Behl/
DC/
USEPA/
US@
EPA
Subject
129111
D330783:
Kresoxim­
methyl
Drinking
Water
Assessment
[
Second
revision]

Attached
is
the
electronic
version
of
the
second
revision
of
the
kresoxim­
methyl
cucurbit
IR­
4
drinking
water
assessment.
A
signed
hard
copy
has
been
submitted
to
the
EFED
tracking
team.
Thank
you!

Roxolana
Kashuba
U.
S.
Environmental
Protection
Agency
Office
of
Pesticide
Programs
Environmental
Fate
and
Effects
Division
1200
Pennsylvania
Ave.
NW
(
7507C)
Washington,
DC
20460
703.308.7772
703.305.6309
(
fax)