UNITED
STATES
ENVIRONMENTAL
PROTECTION
AGENCY
WASHINGTON,
D.
C.
20460
Date:
March
24,
2003
Chemical:
4­
CPA
PC
Code:
019401
DP
Barcode:
D289044
Subject:
4­
CPA
 
Evaluation
of
Endangered
Species
for
the
Tolerance
Reassessment
Decision
(
TRED)
Document
for
4­
CPA
To:
Anne
Overstreet,
Chemical
Review
Manager
Reregistration
Branch
III
Special
Review
and
Reregistration
Division
(
7508C)

From:
Mark
Corbin,
Environmental
Scientist
Environmental
Risk
Branch
1
Environmental
Fate
and
Effects
Division
(
7507C)

Approved
By:
Sid
Abel,
Branch
Chief
Environmental
Risk
Branch
I
Environmental
Fate
and
Effects
Division
(
7507C)

Summary
The
Environmental
Fate
and
Effects
Division
(
EFED)
has
prepared
this
summary
of
the
potential
risks
to
endangered
species
from
the
registered
use
of
4­
chlorophenoxyacetic
acid
(
4­
CPA)
in
response
to
your
request
dated
March
21,
2003.
This
memorandum
is
an
addendum
to
the
drinking
water
assessment
completed
by
EFED
dated
September
11,
2002
for
the
Tolerance
Reassessment
Decision
(
TRED)
for
4­
CPA
previously
submitted
to
the
Special
Review
and
Reregistration
Division
(
SRRD).

EPA
determined
in
1997
in
the
Reregistration
Eligibility
Decision
(
RED)
that
given
the
limited
usage
of
this
chemical
in
total
annual
pounds
used
and
geographic
area
used
there
were
unlikely
to
be
risks
to
endangered
species
associated
with
4­
CPA.
4­
CPA
is
limited
to
approximately
20
pounds
per
year
use
for
indoor
treatment
of
mung
beans
at
a
single
production
facility.
Additionally,
waste
water
discharges
containing
4­
CPA
resulting
from
this
registered
use
are
subject
to
pre­
treatment
requirements
and
are
likely
to
be
significantly
diminished
through
this
process.
Any
residues
of
4­
CPA
leaving
the
production
facility
are
likely
to
be
further
reduced
(
if
not
eliminated)
at
a
publically
owned
treatment
works
(
POTW)
prior
to
entering
surface
water.
Therefore,
EFED
believes
that
the
exposures
and
risks
to
endangered
species
from
the
registered
use
of
4­
CPA
are
likely
to
be
low.
