Document ID: EPA-HQ-OPP-2005-0495-0011
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2005-12-21T05:00Z

B
­
1
APPENDIX
B.

Aquatic
Exposure
Modeling
for
Terrestrial
Applications
(
GENEEC2)

The
Tier
1
surface
water
EECs
resulting
from
terrestrial
uses
were
calculated
using
GENEEC2
version
2.0
(
dated
August
1,
2001).
Discussion
of
estimated
concentrations
resulting
from
the
direct
application
to
the
surface
of
standing
water
bodies,
used
to
estimate
concentrations
resulting
from
aquatic
use
patterns,
of
1.0
foot,
3.0
foot,
and
2.0
meter
depths
can
be
found
in
Appendix
C.
The
GENEEC2
screening
model
(
Generic
Estimated
Environmental
Concentration;
version
2.0,
August
1,
2001),
is
a
Tier
1
computer
program
that
uses
the
soil/
water
partition
coefficient
and
first
order
kinetic,
degradation
data
to
estimate
EECs
(
Environmental
Effects
Concentrations)
for
pesticide
application.
The
pesticide
application
is
made
to
a
generic
crop,
with
a
generic
geographical
location,
that
is
intended
to
represent
the
90th
percentile
for
vulnerability
to
surface
water
runoff.
The
model
takes
into
account
the
physical,
chemical,
and
environmental
fate
properties
of
the
pesticide,
application
rate(
s),
application
intervals,
the
method
of
application
and
agronomic
practices
in
generating
EECs.

GENEEC2
simulates
a
single
rainfall
event,
while
accounting
for
spray
drift
from
multiple
applications.
The
ecosystem
GENEEC2
is
designed
to
represent
is
a
10
ha
field
immediately
adjacent
to
a
1­
ha
pond,
which
is
2
meters
deep
with
no
outlet.
The
pond
receives
a
spray
drift
event
from
each
application
plus
one
rainfall
runoff
event.
The
runoff
event
can
move
a
maximum
of
10%
of
the
applied
pesticide
into
the
pond.
This
amount
is
normally
reduced
by
degradation
in
the
field
and
by
the
effects
of
the
pesticide
binding
to
soil.
The
model
sets
the
contribution
from
spray
drift
to
a
default
value
equal
to
1%
of
the
applied
material
for
ground
spray
application,
and
5%
for
aerial
application.

The
GENEEC2
model
was
used
to
simulate
the
transport
of
the
pesticide
off
the
field,
based
on
the
imazapyr
aerial,
ground,
and
granular
application
information
provided
by
the
registrant.
GENEEC2
evaluates
the
resulting
runoff
and
spray
drift
loading
to
a
receiving
standard
pond,
and
to
estimates
pesticide
concentrations
after
the
residues
reach
the
pond.
Longer­
term,
multiple­
day
average
concentration
values
are
estimated
considering
degradation
processes.
Imazapyr
input
parameters
for
GENEEC2
are
in
Table
B­
1.
The
maximum
environmental
surface
water
GENEEC2
concentration
estimated
for
imazapyr
was
the
predicted
acute
concentration
was
83.9
ppb
from
aerial
applications
of
1.5
pounds
ae/
acre.
Modeling
results
for
other
application
rates
and
methods
are
in
Table
B­
2.
GENEEC2
is
not
suitable
for
estimating
aquatic
concentrations
for
crops
grown
in
aquatic
environments.
Concentrations
resulting
from
the
use
of
imazapyr
in
aquatic
environments
are
evaluated
in
Appendix
C.

Model
Input
and
Output
Values
The
EECs
resulting
from
the
use
of
imazapyr
in
terrestrial
environments
were
calculated
using
application
rates
that
bracket
the
allowable
annual
application
rates
for
non­
crop
uses,
forestry
uses,
and
the
maximum
application
rate
for
Clearfield
 
corn.
The
resulting
EECs
are
presented
B
­
2
in
Table
B­
2,
below.

The
GENEEC2
input
parameters
for
imazapyr
associated
with
each
registered
use
were
selected
using
the
Input
Parameter
Guidance
(
http://
www.
epa.
gov/
pesticides/
cumulative/
pra­
op/
iii_
e_
5­
f.
pdf),

and
are
presented
in
Table
B­
1,
below.

Table
B­
1.
GENEEC2
Input
Parameters
for
Imazapyr
Parameters
Values
&
Units
Sources
Water
Solubility
@
20oC
11.1
x
103
mg/
L
25
°
C,
2003
Science
Chapter
for
New
Aquatic
Uses
Hydrolysis
Half­
Life
(
pH
7)
stable
MRID
00132359
Aerobic
Soil
Metabolism
Half­
life
stable
MRID
00131619
Aerobic
Aquatic
Metabolism
(
total
sediment/
water
system)
stable
MRID
40003712
Aqueous
Photolysis
5.3
days
MRID
00131617
(
maximum
value)

Soil
Water
Partition
Coefficient
­
Kd
0.639
Lowest
Non­
Sand
Kd
(
silt
loam
soil)
MRID
45119705
Pesticide
is
Wetted­
In
no
Product
Label
Table
B­
2.
Estimated
Environmental
Concentrations
(:
g
ae/
L)
of
Imazapyr
in
Surface
Water
from
Terrestrial
Applications.

Scenario
Concentration
(:
g
ae/
L)

Use
Application
Rate
Peak
21
day
(
max)
60
day
(
max)

Non­
Cropped
(
high
application
rate)
1.5
lbs
ae/
acre
81.6a
83.9b
80.9a
83.2b
79.7a
81.9b
Non­
Cropped
(
low
application
rate)
0.9
lbs
ae/
acre
49.0a
50.3b
48.6a
49.9b
47.8a
49.2b
Forestry
(
high
application
rate)
1.5
lbs
ae/
acre
76.8d
76.2d
75.0d
Forestry
(
low
application
rate)
0.5
lbs
ae/
acre
25.6d
25.4d
25.0d
Clearfield
 
Corn
0.014
lbs
ae/
acre
0.76a
0.78b
0.76a
0.78b
0.74a
0.76b
a
Ground
spray
application
input
and
output
for
GENEEC2
modeling
is
in
Appendix
B.
b
Aerial
spray
application
input
and
output
for
GENEEC2
modeling
is
in
Appendix
B.
c
Applied
to
entire
water
body
(
½
mile
setback
not
considered).
d
Granular
broadcast
application
B
­
3
Table
B­
1
presents
the
input
parameters
used
in
the
GENEEC2
modeling
for
ecological
assessment
of
imazapyr
for
surface
water
sources
via
terrestrial
application
to
non­
cropped
areas.
To
simulate
non­
cropped
application
of
imazapyr
for
control
of
unwanted
plants,
two
spray
application
scenarios
were
evaluated
representing
different
usage
areas.
One
scenario
evaluated
the
maximum
application
rate
(
1.5
lbs
ae/
acre),
thus
representing
an
upper
bound
scenario,
and
a
second
scenario
was
evaluated
based
on
the
lowest
application
rate
(
0.9
lbs
ae/
acre)
for
noncropped
areas.
To
simulate
granular
application
for
forestry
uses
of
imazapyr,
two
application
scenarios
were
evaluated
representing
different
use
rates.
One
scenario
evaluated
the
maximum
application
rate
(
1.5
lbs
ae/
acre),
thus
representing
an
upper
bound
scenario,
and
a
second
scenario
was
evaluated
based
on
the
lowest
application
rate
(
0.5
lbs
ae/
acre)
for
forestry
uses.
The
modeled
surface
water
EECs
for
both
the
low
and
high
spray
application
rates
in
the
noncropped
and
forestry
scenarios
are
in
Table
B­
2.
The
GENEEC2
input
and
output
files
from
the
ecological
exposure
assessment
are
also
presented
in
Appendix
B.

Likewise,
a
use
scenario
for
application
of
imazapyr
to
Clearfield
 
corn
was
evaluated.
GENEEC2
was
used
to
estimate
surface
water
concentrations
following
the
maximum
labeled
application
rate
(
0.014
lbs
ae/
acre)
of
imazapyr
for
control
of
weeds
in
corn.
The
modeled
surface
water
EECs
for
application
to
corn
are
in
Table
B­
2.
B
­
4
Aquatic
Exposure
Model
Output
(
GENEEC
2)

GENEEC2
Input
and
Output
for
Imazapyr
Ground
Application
June
30,
2005
RUN
No.
1
imazapyr
noncrop
high
application
rate
*
INPUT
VALUES
*
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
1.500(
1.500)
1
1
.611100.0
GRHIFI(
6.6)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
GENERIC
EECs
(
IN
MICROGRAMS/
LITER
(
PPB))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
81.60
81.50
80.94
79.67
78.73
*******************************************

RUN
No.
2
imazapyr
noncrop
low
application
rate
*
INPUT
VALUES
*
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.900(
.900)
1
1
.611100.0
GRHIFI(
6.6)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
B
­
5
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
GENERIC
EECs
(
IN
MICROGRAMS/
LITER
(
PPB))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
48.96
48.90
48.56
47.80
47.24
**********************************************

RUN
No.
3
imazapyr
ON
corn
*
INPUT
VALUES
*
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.014(
.014)
1
1
.611100.0
GRHIFI(
6.6)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
GENERIC
EECs
(
IN
NANOGRAMS/
LITER
(
PPTr))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
761.59
760.68
755.42
743.60
734.77
B
­
6
GENEEC2
Imazapyr
Input
and
Output
Aerial
Application
June
30,
2005
RUN
No.
1
imazapyr
noncrop
high
application
rate
*
INPUT
VALUES
*
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
1.500(
1.500)
1
1
.611100.0
AERL_
B(
13.0)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
GENERIC
EECs
(
IN
MICROGRAMS/
LITER
(
PPB))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
83.88
83.79
83.21
81.92
80.95
******************************************************

RUN
No.
2
imazapyr
noncrop
low
application
rate
*
INPUT
VALUES
*
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.900(
.900)
1
1
.611100.0
AERL_
B(
13.0)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
B
­
7
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
GENERIC
EECs
(
IN
MICROGRAMS/
LITER
(
PPB))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
50.33
50.27
49.93
49.15
48.57
****************************************

RUN
No.
3
imazapyr
ON
corn
*
INPUT
VALUES
*

­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.014(
.014)
1
1
.611100.0
AERL_
B(
13.0)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
GENERIC
EECs
(
IN
NANOGRAMS/
LITER
(
PPTr))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
782.90
782.00
776.64
764.58
755.56
B
­
8
RUN
No.
22
FOR
imazapyr
ON
forrest
*
INPUT
VALUES
*
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
1.500(
1.500)
1
1
.611100.0
GRANUL(
.0)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
GENERIC
EECs
(
IN
MICROGRAMS/
LITER
(
PPB))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
76.83
76.74
76.20
75.00
74.10
******************************************************************************

RUN
No.
23
FOR
imazapyr
ON
forrest
*
INPUT
VALUES
*
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
RATE
(#/
AC)
No.
APPS
&
SOIL
SOLUBIL
APPL
TYPE
NO­
SPRAY
INCORP
ONE(
MULT)
INTERVAL
Kd
(
PPM
)
(%
DRIFT)
ZONE(
FT)
(
IN)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.500(
.500)
1
1
.611100.0
GRANUL(
.0)
.0
.0
FIELD
AND
STANDARD
POND
HALFLIFE
VALUES
(
DAYS)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
METABOLIC
DAYS
UNTIL
HYDROLYSIS
PHOTOLYSIS
METABOLIC
COMBINED
(
FIELD)
RAIN/
RUNOFF
(
POND)
(
POND­
EFF)
(
POND)
(
POND)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
.00
2
N/
A
5.30­
657.20
.00
657.20
B
­
9
GENERIC
EECs
(
IN
MICROGRAMS/
LITER
(
PPB))
Version
2.0
Aug
1,
2001
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
PEAK
MAX
4
DAY
MAX
21
DAY
MAX
60
DAY
MAX
90
DAY
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
AVG
GEEC
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
25.61
25.58
25.40
25.00
24.70