Document ID: EPA-HQ-OPP-2005-0479-0006
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2005-12-28T05:00Z

UNITED
STATES
ENVIRONMENTAL
PROTECTION
AGENCY
WASHINGTON,
D.
C.
20460
OFFICE
OF
PREVENTION,
PESTICIDES
AND
TOXIC
SUBSTANCES
May
31,
2005
DP
Barcode:
317705
PC
Code:
029801,
029806,
129043
MEMORANDUM
SUBJECT:
Drinking
water
assessment
for
Dicamba
on
sugarcane.

TO:
Susan
Lewis,
Branch
Chief
Kendra
Tyler,
CRM
Special
Review
and
Reregistration
Division
(
7508C)

FROM:
Ibrahim
Abdel­
Saheb,
Environmental
Scientist
Environmental
Risk
Branch
II
Environmental
Fate
and
Effects
Division
THRU:
Dana
Spatz,
Senior
Chemist
Environmental
Risk
Branch
II
Environmental
Fate
and
Effects
Division
Tom
Bailey,
Branch
Chief
Environmental
Risk
Branch
II
Environmental
Fate
and
Effects
Division
CONCLUSIONS
This
drinking
water
assessment
is
for
the
herbicide
active
ingredient
Dicamba
(
Chemical
Name:
3,6­
Dichloro­
o­
anisic
acid),
and
its
degradate
dichlorosalicylic
acid
(
DCSA).
Dicamba
acid
is
formed
by
the
dissociation
of
the
following
dicamba
salts:
dimethylamine,
sodium,
diglycolamine,
isopropylamine,
and
potassium.
Results
from
an
acceptable
dissociation
rate
study
(
MRID#
43288001)
showed
that
dicamba
salts
reach
essentially
100%
dissociation
within
75
seconds
of
the
time
of
mixing
with
pure
water.
Thus,
this
water
memo
reflects
the
exposure
EECs
resulting
from
the
use
of
any
of
the
dicamba
salt
formulations.

Dicamba
is
a
benzoic
acid
herbicide.
It
can
be
applied
to
the
leaves
or
to
the
soil.
Dicamba
controls
annual
and
perennial
broadleaf
weeds
in
grain
crops
and
grasslands,
and
it
is
used
to
control
brush
and
bracken
in
pastures.
In
combination
with
a
phenoxyalkanoic
acid
or
other
herbicide,
dicamba
is
used
in
pastures,
range
land,
and
non­
crop
areas
such
as
fence­
rows
and
roadways
to
control
weeds.
Dicamba
is
absorbed
by
leaves
and
roots,
and
moves
throughout
the
plant.
In
some
plants,
it
may
accumulate
in
the
tips
of
leaves.
Dicamba
acts
as
a
growth
regulator.
Some
plants
can
metabolize
or
break
down
dicamba.
2
The
Tier
II
screening
models
PRZM1
and
EXAMS2
with
the
Index
Reservoir
and
Percent
Crop
Area
adjustment
(
IR­
PCA
PRZM/
EXAMS)
were
used
to
determine
estimated
surface
water
concentrations
of
Dicamba
acid
and
its
degradate
DCSA.

Based
on
PRZM/
EXAMS
modeling,
the
surface
water
Expected
Environmental
Concentrations
(
EEC)
of
Dicamba
acid
and
its
degradate
DCSA
for
the
use
on
sugarcane
are
shown
in
table
1.

Table
1.
Estimated
drinking
water
concentrations
to
be
used
for
exposure
to
Dicamba
acid,
and
its
degradate
dichlorosalicylic
acid
(
DCSA)
in
drinking
water
derived
from
Surface
Water.

Crop
Model
EECs
(:
g/
L)

Dicamba
DCSA
use(
s)
modeled
PCA
Acute
One­
in­
10­
year
annual
mean
36
year
overall
mean
Acute
One­
in­
10­
year
annual
mean
36
year
overall
mean
One
application
@
2.8
lbai/
A
(
parent);
and
0.446
lbai/
A
(
DCSA)
0.87
FL­
Sugarcane
(
Ground)
357
13.0
5.23
10.1
0.75
0.40
FL­
Sugarcane
(
Aerial)
346
12.9
5.38
10.9
8.13
0.47
LA­
Sugarcane
(
Ground)
233
9.74
3.13
8.79
0.66
0.32
LA­
Sugarcane
(
Aerial)
230
9.74
3.44
9.74
0.73
0.39
Ground
Water
0.016
0.008
Environmental
Fate
Assessment:

Aerobic
soil
metabolism
is
the
main
degradative
process
for
dicamba.
A
single
observed
halflife
for
dicamba
was
six
days,
with
formation
of
the
intermediate
non­
persistent
degradate
DCSA.
DCSA
degraded
at
roughly
the
same
rate
as
dicamba;
the
final
metabolites
were
carbon
dioxide
and
microbial
biomass.
Dicamba
is
stable
to
abiotic
hydrolysis
at
all
pH's
and
photodegrades
slowly
in
water
and
on
soil.
Dicamba
is
more
persistent
under
anaerobic
soil:
water
systems
in
the
laboratory,
with
a
half­
life
of
141
days.
The
major
degradate
under
anaerobic
conditions
was
DCSA,
which
was
persistent,
comprising
>
60%
of
the
applied
after
365
days
of
anaerobic
incubation.
No
other
anaerobic
degradates
were
present
at
>
10%
during
the
incubation.
There
are
no
acceptable
data
for
the
aerobic
aquatic
metabolism
of
dicamba;
supplemental
information
indicates
that
dicamba
degrades
more
rapidly
in
aquatic
systems
when
sediment
is
present.
3
Dicamba
is
very
soluble
(
6100
ppm)
and
very
mobile
(
K
oc
=
13.4)
in
the
laboratory.
Because
dicamba
is
not
persistent
under
aerobic
conditions,
very
little
dicamba
could
be
expected
to
leach
to
groundwater.
If
any
dicamba
did
reach
anaerobic
ground
water,
it
would
be
somewhat
persistent
(
due
to
its
anaerobic
half­
life
of
141
days);
any
DCSA
that
reached
ground
water
would
be
expected
to
persist.
Results
from
two
acceptable
field
dissipation
studies
conducted
with
dimethylamine
salt
of
dicamba,
indicated
that
dicamba
dissipated
with
a
half­
life
range
of
4.4
to
19.8
days.
The
DCSA
was
the
major
degradate
in
both
studies.
Both,
dicamba
and
its
degradate
(
DCSA)
were
found
in
soil
segments
deeper
than
10
cm.
Dicamba
is
not
expected
to
bioaccumulate
in
aquatic
organisms
because
it
is
an
anion
at
environmental
pHs
(
pKa
=
1.9).

Monitoring
data
Monitoring
data
were
not
used
to
refine
this
Tier
I
assessment.
However,
monitoring
data
are
available
in
the
Pesticides
in
Ground
Water
Database
[
Hoheisel
et
al.
1991]
for
dicamba
(
3,172
wells
sampled)
and
5­
hydroxy
dicamba
(
87
wells
sampled).
Out
of
the
wells
sampled,
there
were
no
reports
of
residues
greater
than
the
stated
MCL
(
200
µ
g/
L
lifetime).
However,
the
detection
limits
are
unknown,
and
it
is
not
known
if
wells
were
sampled
in
areas
where
dicamba
was
used.
STORET
contains
records
for
sampling
for
dicamba
in
samples
from
lakes,
ocean,
estuary,
canal,
or
reservoir
sites.
The
data
have
not
been
extensively
evaluated;
in
addition,
it
is
uncertain
what
the
actual
detection
limits
were
for
the
samples
and
whether
samples
were
taken
from
areas
where
dicamba
was
not
in
use.
The
US
Geological
Survey
National
Water
Quality
Assessment
program
(
NAWQA)
is
not
currently
analyzing
for
dicamba
in
their
samples,
and
they
do
not
have
analytical
methods
for
this
chemical
in
place.

SURFACE
WATER
PRZM­
EXAMS
simulations
were
conducted
for
Dicamba
acid
and
its
degradate
DCSA
use
on
sugarcane
to
evaluate
the
cumulative
probability
distribution
for
peak
and
annual
mean
EECs.
Selective
PRZM/
EXAMS
modeling
inputs
are
shown
in
Tables
2
and
3.
The
input
and
output
files
for
these
runs
are
in
Appendix
I.
4
Table
2.
Surface
Water
Exposure
Inputs
for
PRZM/
EXAMS
for
Dicamba
acid.

Input
variable
(
Units)
Input
value
&
calculations
Source
Crop
name
sugarcane
EPA
Reg.
No.
7969­
140
application
rate
(
lb
ai/
acre)
2.8
EPA
Reg.
No.
7969­
140
Interval
between
appl.
(
d)
N/
A
EPA
Reg.
No.
7969­
140
Application
efficiency
0.95
(
aerial);
0.99
(
ground)
Input
parameters
guideline
(
2/
28/
2002).

Spray
drift
fraction
0.16
(
aerial);
0.064
(
ground)
Input
parameters
guideline
(
2/
28/
2002).

DWRATE
(
day­
1)
0.038
(
6
d
x
3)
MRID
#
43245207;
Input
parameters
guideline
(
2/
28/
2002).

DSRATE
(
day­
1)
0.038
MRID
#
43245207;
Input
parameters
guideline
(
2/
28/
2002).

K
oc
(
mL/
g)
13.4
(
average)
MRID#
42774101;
Input
parameters
guideline
(
2/
28/
2002).

Henry's
Law
Const.
(
atm.
m3/
mole)
1.6X10­
9
calculated
KBACW
(
h­
1)
0.058
(
6X2=
12
d)
No
data;
aerobic
soil
metabolism
half­
life
rate
X
0.5;
Input
parameters
guideline
(
2/
28/
2002).

KBACS
(
h­
1)
0.0016
(
141X3=
423
d)
MRID#
43245208;
Input
parameters
guideline
(
2/
28/
2002).

KDP
(
h­
1)
0.00076
(
914.4)
MRID#
42774102;
Input
parameters
guideline
(
2/
28/
2002).

KBH,
KNH,
KAH
(
h­
1)
stable
MRID#
40547902;
Input
parameters
guideline
(
2/
28/
2002).

KPS
(
mL/
g)
13.4
(
average)
MRID#
42774101;
Input
parameters
guideline
(
2/
28/
2002).

MWT
(
g/
mole)
221
SANDOZE
Safety
Data
Sheet
(
Nov,
1989).

Solubility
@
25
0C
(
mg/
L)
6100
SANDOZE
Safety
Data
Sheet
(
Nov,
1989).

Vapor
pressure
(
torr)
3.41X10­
5
SANDOZE
Safety
Data
Sheet
(
Nov,
1989).

Table
3.
Surface
Water
Exposure
Inputs
for
PRZM/
EXAMS
for
DCSA.

Input
variable
(
Units)
Input
value
&
calculations
Source
Crop
name
sugarcane
EPA
Reg.
No.
7969­
140
application
rate
(
lb
ai/
acre)
0.446*
EPA
Reg.
No.
7969­
140
Interval
between
appl.
(
d)
N/
A
EPA
Reg.
No.
7969­
140
Application
efficiency
0.95
(
aerial);
0.99
(
ground)
Input
parameters
guideline
(
2/
28/
2002).

Spray
drift
fraction
0.16
(
aerial);
0.064
(
ground)
Input
parameters
guideline
(
2/
28/
2002).

DWRATE
(
day­
1)
0.0282
(
8.2
d
x3)
MRID
#
43245207;
Input
parameters
guideline
(
2/
28/
2002).
5
DSRATE
(
day­
1)
0.0282
(
8.2
d
x3)
MRID
#
43245207;
Input
parameters
guideline
(
2/
28/
2002).

K
oc
(
mL/
g)
1208
(
average)
MRID#
43095301;
Input
parameters
guideline
(
2/
28/
2002).

Henry's
Law
Const.
(
atm.
m3/
mole)
1.6X10­
9
calculated
for
dicamba
KBACW
(
h­
1)
0.058
(
8.2X2=
16.4
d)
No
data;
aerobic
soil
metabolism
half­
life
rate
X
0.5;
Input
parameters
guideline
(
2/
28/
2002).

KBACS
(
h­
1)
stable
MRID#
43245208;
Input
parameters
guideline
(
2/
28/
2002).

KDP
(
h­
1)
0.00076
(
914.4)
For
dicamba;
MRID#
42774102;
Input
parameters
guideline
(
2/
28/
2002).

KBH,
KNH,
KAH
(
h­
1)
stable
For
dicamba;
MRID#
40547902;
Input
parameters
guideline
(
2/
28/
2002).

KPS
(
mL/
g)
1208
(
average)
MRID#
43095301;
Input
parameters
guideline
(
2/
28/
2002).

MWT
(
g/
mole)
207
Product
Chemistry
Info.

Solubility
@
25
0C
(
mg/
L)
2112
MRID#
43095301
Vapor
pressure
(
torr)
3.41X10­
5
For
dicamba;
SANDOZE
Safety
Data
Sheet
(
Nov,
1989).

GROUND
WATER
The
SCI­
GROW
model
is
based
on
scaled
ground
water
concentration
from
ground
water
monitoring
studies,
environmental
fate
properties
(
aerobic
soil
half­
lives
and
organic
carbon
partitioning
coefficients­
K
oc
'
s)
and
application
rates.
The
model
is
based
on
permeable
soils
that
are
vulnerable
to
leaching
and
on
shallow
ground
water
(
10­
30
feet).
SCI­
GROW
version
2.3
(
executable
file
dated
08/
05/
2003)
was
used
to
estimate
concentrations
of
Dicamba
acid,
and
its
degradate
dichlorosalicylic
acid
(
DCSA)
that
could
be
found
in
drinking
water
derived
from
ground
water,
using
the
input
values
listed
in
the
tables
4
and
5.

Table
4.
Ground
Water
Exposure
Inputs
for
SCI­
GROW
for
Dicamba
acid.

MODEL
INPUT
VARIABLE
INPUT
VALUE
COMMENTS
Application
Rate
(
lbs.
ai/
A)
2.8
EPA
Reg.
No.
7969­
140
Maximum
No.
of
Applications
1
EPA
Reg.
No.
7969­
140
Koc
(
mL/
g)
3.45
Lowest
value;
MRID#
42774101;
Input
guideline2,
2002.

Aerobic
Soil
Metabolic
Half­
life
(
days)
6
MRID
MRID
#
43245207;
Input
guideline2,
2002.
6
Table
5.
Ground
Water
Exposure
Inputs
for
SCI­
GROW
for
DCSA.

MODEL
INPUT
VARIABLE
INPUT
VALUE
COMMENTS
Application
Rate
(
lbs.
ai/
A)
0.446
EPA
Reg.
No.
7969­
140
Maximum
No.
of
Applications
1
EPA
Reg.
No.
7969­
140
Koc
(
mL/
g)
242.4
Lowest
value;
MRID#
43095301;
Input
guideline2,
2002.

Aerobic
Soil
Metabolic
Half­
life
(
days)
8.2
MRID
MRID
#
43245207;
Input
guideline2,
2002.

Results
from
the
SCI­
GROW
screening
model
predict
that
the
maximum
chronic
and
acute
concentration
of
parent
Dicamba
acid,
and
its
degradates
the
dichlorosalicylic
acid
(
DCSA)
in
shallow
ground
water
is
not
expected
to
exceed
0.016
µ
g/
L,
and
0.0081
µ
g/
L,
respectively,
for
the
current
maximum
seasonal
use
rate
on
sugarcane.
7
APPENDIX
I
IR­
PCA
PRZM/
EXAMS
INPUT
&
OUTPUT
FILES
DICAMBA
FL­
Sugarcane
(
Ground)

stored
as
DicaFLGr.
out
Chemical:
dicamba
PRZM
environment:
FLsugarcaneC.
txt
modified
Satday,
12
October
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w12844.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
9.964
8.696
6.909
5.306
3.801
0.943
1962
87.71
75.51
45.4
21.47
14.8
3.664
1963
490
427
246
106
71.57
17.7
1964
89.42
77.5
47.63
24.72
16.79
4.143
1965
20.89
17.95
10.75
7.108
5.768
1.451
1966
9.576
8.448
5.791
4.438
3.249
0.8084
1967
39.41
33.75
24
10.68
7.983
2.04
1968
34.53
30.81
22.7
12.46
8.648
2.137
1969
249
226
131
56.09
38.38
9.496
1970
153
134
76.58
32.17
22.31
5.576
1971
90.64
78
51.97
27.52
19.29
4.781
1972
390
339
208
90.06
60.62
14.93
1973
69.17
59.06
33.84
15.6
10.96
2.72
1974
21.67
19.13
12.59
6.741
4.958
1.235
1975
12.59
11.75
8.947
5.771
4.11
1.021
1976
64.42
58.27
42.85
20.12
13.88
3.426
1977
301
260
151
67.27
46.02
11.39
8
1978
49.28
42.92
34.64
17.17
11.69
2.894
1979
395
344
202
89.16
60.4
14.93
1980
126
111
67.87
33.68
22.87
5.641
1981
37.37
31.96
24.49
14.13
10.09
2.504
1982
307
266
160
70.13
47.44
11.72
1983
9.783
8.575
5.729
4.73
3.511
0.875
1984
139
120
71.76
30.67
21.4
5.337
1985
157
137
83.94
41.26
27.85
6.883
1986
26.61
22.85
13.95
9.008
7.043
1.771
1987
99.88
85.67
60.66
27.55
19.08
4.723
1988
412
358
207
89.3
60.6
14.95
1989
511
449
266
114
76.47
18.89
1990
35.28
30.72
19.69
10.94
7.553
1.872
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
511
449
266
114
76.47
18.89
0.064516
490
427
246
106
71.57
17.7
0.096774
412
358
208
90.06
60.62
14.95
0.129032
395
344
207
89.3
60.6
14.93
0.16129
390
339
202
89.16
60.4
14.93
0.193548
307
266
160
70.13
47.44
11.72
0.225806
301
260
151
67.27
46.02
11.39
0.258065
249
226
131
56.09
38.38
9.496
0.290323
157
137
83.94
41.26
27.85
6.883
0.322581
153
134
76.58
33.68
22.87
5.641
0.354839
139
120
71.76
32.17
22.31
5.576
0.387097
126
111
67.87
30.67
21.4
5.337
0.419355
99.88
85.67
60.66
27.55
19.29
4.781
0.451613
90.64
78
51.97
27.52
19.08
4.723
9
0.483871
89.42
77.5
47.63
24.72
16.79
4.143
0.516129
87.71
75.51
45.4
21.47
14.8
3.664
0.548387
69.17
59.06
42.85
20.12
13.88
3.426
0.580645
64.42
58.27
34.64
17.17
11.69
2.894
0.612903
49.28
42.92
33.84
15.6
10.96
2.72
0.645161
39.41
33.75
24.49
14.13
10.09
2.504
0.677419
37.37
31.96
24
12.46
8.648
2.137
0.709677
35.28
30.81
22.7
10.94
7.983
2.04
0.741935
34.53
30.72
19.69
10.68
7.553
1.872
0.774194
26.61
22.85
13.95
9.008
7.043
1.771
0.806452
21.67
19.13
12.59
7.108
5.768
1.451
0.83871
20.89
17.95
10.75
6.741
4.958
1.235
0.870968
12.59
11.75
8.947
5.771
4.11
1.021
0.903226
9.964
8.696
6.909
5.306
3.801
0.943
0.935484
9.783
8.575
5.791
4.73
3.511
0.875
0.967742
9.576
8.448
5.729
4.438
3.249
0.8084
0.1
410.3
356.6
207.9
89.984
60.618
14.948
Average
of
yearly
averages:
6.015047
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DicaFLGr
Metfile:
w12844.
dvf
PRZM
scenario:
FLsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
221.04
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
Solubility
sol
6100
mg/
L
Kd
Kd
mg/
L
Koc
Koc
13.4
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
12
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
423
days
Halfife
10
Aerobic
Soil
Metabolism
asm
18
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
3.14
kg/
ha
Application
Efficiency:
APPEFF
0.99
fraction
Spray
Drift
DRFT
0.064
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,

FL­
Sugarcane
(
Aerial)
stored
as
DicaFLAr.
out
Chemical:
dicamba
PRZM
environment:
FLsugarcaneC.
txt
modified
Satday,
12
October
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w12844.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
18.33
15.8
10.04
7.651
5.367
1.329
1962
86.93
74.83
45.05
23.21
15.96
3.949
1963
473
413
238
103
70.4
17.41
1964
89.79
77.81
48.41
26.21
17.78
4.387
1965
21.41
18.4
10.99
9.053
7.211
1.806
1966
18.34
16.04
10.64
6.861
4.867
1.208
1967
38.03
32.57
23.15
10.3
9.375
2.381
1968
34.93
31.24
23.2
14.51
10.01
2.473
1969
242
219
127
56.16
38.53
9.531
1970
147
130
73.76
30.99
23.04
5.754
1971
88.21
75.9
51.57
29.01
20.27
5.022
1972
382
333
204
88.97
59.88
14.75
1973
68.21
58.24
33.35
17.45
12.18
3.021
11
1974
21.95
19.43
12.7
8.979
6.444
1.601
1975
18.34
15.94
9.747
8.066
5.644
1.4
1976
65.29
59.14
42.97
21.92
15.07
3.72
1977
291
251
146
66.55
45.85
11.35
1978
53.23
46.41
36.27
19
12.92
3.196
1979
385
335
197
88.07
59.68
14.75
1980
130
114
69.71
34.97
23.73
5.851
1981
37.99
32.5
24.53
16.02
11.34
2.81
1982
300
260
157
69.78
47.19
11.66
1983
19.95
17.44
11.46
7.139
5.117
1.271
1984
134
115
69.24
29.6
22.32
5.561
1985
162
142
86.46
42.16
28.46
7.032
1986
26.92
23.12
14.07
10.57
8.531
2.137
1987
98.43
84.42
59.47
29.18
20.15
4.987
1988
399
346
200
87.66
59.86
14.76
1989
502
441
261
112
75.06
18.54
1990
39.81
34.66
21.89
13.02
8.935
2.213
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
502
441
261
112
75.06
18.54
0.064516
473
413
238
103
70.4
17.41
0.096774
399
346
204
88.97
59.88
14.76
0.129032
385
335
200
88.07
59.86
14.75
0.16129
382
333
197
87.66
59.68
14.75
0.193548
300
260
157
69.78
47.19
11.66
0.225806
291
251
146
66.55
45.85
11.35
0.258065
242
219
127
56.16
38.53
9.531
0.290323
162
142
86.46
42.16
28.46
7.032
0.322581
147
130
73.76
34.97
23.73
5.851
12
0.354839
134
115
69.71
30.99
23.04
5.754
0.387097
130
114
69.24
29.6
22.32
5.561
0.419355
98.43
84.42
59.47
29.18
20.27
5.022
0.451613
89.79
77.81
51.57
29.01
20.15
4.987
0.483871
88.21
75.9
48.41
26.21
17.78
4.387
0.516129
86.93
74.83
45.05
23.21
15.96
3.949
0.548387
68.21
59.14
42.97
21.92
15.07
3.72
0.580645
65.29
58.24
36.27
19
12.92
3.196
0.612903
53.23
46.41
33.35
17.45
12.18
3.021
0.645161
39.81
34.66
24.53
16.02
11.34
2.81
0.677419
38.03
32.57
23.2
14.51
10.01
2.473
0.709677
37.99
32.5
23.15
13.02
9.375
2.381
0.741935
34.93
31.24
21.89
10.57
8.935
2.213
0.774194
26.92
23.12
14.07
10.3
8.531
2.137
0.806452
21.95
19.43
12.7
9.053
7.211
1.806
0.83871
21.41
18.4
11.46
8.979
6.444
1.601
0.870968
19.95
17.44
10.99
8.066
5.644
1.4
0.903226
18.34
16.04
10.64
7.651
5.367
1.329
0.935484
18.34
15.94
10.04
7.139
5.117
1.271
0.967742
18.33
15.8
9.747
6.861
4.867
1.208
0.1
397.6
344.9
203.6
88.88
59.878
14.759
Average
of
yearly
averages:
6.195333
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DicaFLAr
Metfile:
w12844.
dvf
PRZM
scenario:
FLsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
221.04
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
13
Solubility
sol
6100
mg/
L
Kd
Kd
mg/
L
Koc
Koc
13.4
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
12
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
423
days
Halfife
Aerobic
Soil
Metabolism
asm
18
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
3.14
kg/
ha
Application
Efficiency:
APPEFF
0.95
fraction
Spray
Drift
DRFT
0.16
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,

LA­
Sugarcane
(
Ground)

stored
as
DicaLAgr.
out
Chemical:
dicamba
PRZM
environment:
LAsugarcaneC.
txt
modified
Satday,
12
October
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w13970.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
126
111
75.6
35.68
24.59
6.098
1962
280
254
154
68.29
46.64
11.54
1963
7.339
6.47
4.387
2.152
1.459
0.3649
1964
28.67
25.42
20.75
10.25
6.939
1.711
1965
64.03
56.64
35.34
16.39
11.1
2.746
1966
163
145
97.6
46.11
31.27
7.733
1967
59.42
52.24
36.16
19.41
13.17
3.259
1968
11.07
9.798
6.269
3.793
2.582
0.6382
1969
14.86
13.26
9.358
5.353
3.634
0.8987
14
1970
127
113
73.27
35.87
24.28
6.003
1971
10.61
9.571
5.986
4.157
2.903
0.7218
1972
22.58
19.72
12.25
7.334
5.06
1.25
1973
342
313
212
98.02
66.21
16.36
1974
38.95
34.73
22.72
11
7.443
1.845
1975
55.59
49.14
30.31
14.55
9.987
2.474
1976
31.13
27.59
17.56
9.345
6.621
1.641
1977
92.03
82.21
54.58
25.29
17.08
4.223
1978
88.5
76.73
54.45
24.73
17.04
4.22
1979
344
314
205
94.67
64.27
15.9
1980
46.46
41.66
31.82
15.53
10.5
2.595
1981
12.45
10.99
8.261
4.293
2.908
0.7198
1982
33.3
30.09
20.22
9.737
6.571
1.624
1983
54.43
49.28
32.33
16.54
11.35
2.812
1984
14.03
12.28
8.154
5.122
3.593
0.8903
1985
7.334
6.537
4.35
2.661
1.818
0.4501
1986
78.9
70.31
44.45
20.81
14.09
3.482
1987
17.11
14.87
8.895
5.306
3.705
0.9197
1988
38.27
34.17
22.49
10.73
7.267
1.792
1989
56.18
49.03
29.01
13.69
9.465
2.345
1990
15.63
13.98
9.067
5.107
3.466
0.8577
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
344
314
212
98.02
66.21
16.36
0.064516
342
313
205
94.67
64.27
15.9
0.096774
280
254
154
68.29
46.64
11.54
0.129032
163
145
97.6
46.11
31.27
7.733
0.16129
127
113
75.6
35.87
24.59
6.098
0.193548
126
111
73.27
35.68
24.28
6.003
15
0.225806
92.03
82.21
54.58
25.29
17.08
4.223
0.258065
88.5
76.73
54.45
24.73
17.04
4.22
0.290323
78.9
70.31
44.45
20.81
14.09
3.482
0.322581
64.03
56.64
36.16
19.41
13.17
3.259
0.354839
59.42
52.24
35.34
16.54
11.35
2.812
0.387097
56.18
49.28
32.33
16.39
11.1
2.746
0.419355
55.59
49.14
31.82
15.53
10.5
2.595
0.451613
54.43
49.03
30.31
14.55
9.987
2.474
0.483871
46.46
41.66
29.01
13.69
9.465
2.345
0.516129
38.95
34.73
22.72
11
7.443
1.845
0.548387
38.27
34.17
22.49
10.73
7.267
1.792
0.580645
33.3
30.09
20.75
10.25
6.939
1.711
0.612903
31.13
27.59
20.22
9.737
6.621
1.641
0.645161
28.67
25.42
17.56
9.345
6.571
1.624
0.677419
22.58
19.72
12.25
7.334
5.06
1.25
0.709677
17.11
14.87
9.358
5.353
3.705
0.9197
0.741935
15.63
13.98
9.067
5.306
3.634
0.8987
0.774194
14.86
13.26
8.895
5.122
3.593
0.8903
0.806452
14.03
12.28
8.261
5.107
3.466
0.8577
0.83871
12.45
10.99
8.154
4.293
2.908
0.7218
0.870968
11.07
9.798
6.269
4.157
2.903
0.7198
0.903226
10.61
9.571
5.986
3.793
2.582
0.6382
0.935484
7.339
6.537
4.387
2.661
1.818
0.4501
0.967742
7.334
6.47
4.35
2.152
1.459
0.3649
0.1
268.3
243.1
148.36
66.072
45.103
11.1593
Average
of
yearly
averages:
3.603807
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DicaLAgr
16
Metfile:
w13970.
dvf
PRZM
scenario:
LAsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
221.04
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
Solubility
sol
6100
mg/
L
Kd
Kd
mg/
L
Koc
Koc
13.4
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
12
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
423
days
Halfife
Aerobic
Soil
Metabolism
asm
18
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
3.14
kg/
ha
Application
Efficiency:
APPEFF
0.99
fraction
Spray
Drift
DRFT
0.064
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,

LA­
Sugarcane
(
Aerial)

stored
as
DicaLAAr.
out
Chemical:
dicamba
PRZM
environment:
LAsugarcaneC.
txt
modified
Satday,
12
October
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w13970.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
127
115
78.11
38.31
26.37
6.537
1962
275
249
151
68.46
46.82
11.59
1963
18.34
16.17
10.38
4.824
3.258
0.8095
1964
36.65
32.49
25.27
12.69
8.586
2.117
17
1965
70.22
62.12
38.76
18.58
12.58
3.11
1966
164
147
99.13
47.26
32.04
7.923
1967
68.31
60.06
40.81
21.4
14.51
3.592
1968
18.34
16.29
12.4
6.557
4.446
1.098
1969
20.57
18.61
15.4
8.122
5.499
1.36
1970
133
118
76.61
37.32
25.25
6.244
1971
18.34
16.45
10.8
7.099
4.887
1.212
1972
24.49
21.38
14.34
9.937
6.809
1.681
1973
338
310
210
97.16
65.62
16.22
1974
48.68
43.4
28.27
13.47
9.11
2.257
1975
58.29
51.53
31.91
17.03
11.66
2.886
1976
32.4
28.71
18.55
12.03
8.426
2.086
1977
96.31
86.15
57.28
27.24
18.39
4.546
1978
88.78
76.98
54.21
26.67
18.32
4.538
1979
337
309
201
93.71
63.71
15.76
1980
51.06
45.79
36.09
17.92
12.11
2.991
1981
18.84
17.58
14.15
6.987
4.725
1.169
1982
39.95
36.02
25.43
12.3
8.292
2.049
1983
60.16
54.47
35.73
19.13
13.1
3.243
1984
18.34
16.37
10.58
7.913
5.473
1.354
1985
18.34
16.34
10.64
5.514
3.742
0.9257
1986
84.13
74.98
47.4
22.9
15.49
3.829
1987
18.87
16.46
10.81
8.13
5.605
1.389
1988
46.22
41.26
27.31
13.29
8.995
2.218
1989
57.55
50.21
29.7
16.11
11.09
2.745
1990
20.69
18.51
14.4
7.868
5.322
1.316
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
338
310
210
97.16
65.62
16.22
18
0.064516
337
309
201
93.71
63.71
15.76
0.096774
275
249
151
68.46
46.82
11.59
0.129032
164
147
99.13
47.26
32.04
7.923
0.16129
133
118
78.11
38.31
26.37
6.537
0.193548
127
115
76.61
37.32
25.25
6.244
0.225806
96.31
86.15
57.28
27.24
18.39
4.546
0.258065
88.78
76.98
54.21
26.67
18.32
4.538
0.290323
84.13
74.98
47.4
22.9
15.49
3.829
0.322581
70.22
62.12
40.81
21.4
14.51
3.592
0.354839
68.31
60.06
38.76
19.13
13.1
3.243
0.387097
60.16
54.47
36.09
18.58
12.58
3.11
0.419355
58.29
51.53
35.73
17.92
12.11
2.991
0.451613
57.55
50.21
31.91
17.03
11.66
2.886
0.483871
51.06
45.79
29.7
16.11
11.09
2.745
0.516129
48.68
43.4
28.27
13.47
9.11
2.257
0.548387
46.22
41.26
27.31
13.29
8.995
2.218
0.580645
39.95
36.02
25.43
12.69
8.586
2.117
0.612903
36.65
32.49
25.27
12.3
8.426
2.086
0.645161
32.4
28.71
18.55
12.03
8.292
2.049
0.677419
24.49
21.38
15.4
9.937
6.809
1.681
0.709677
20.69
18.61
14.4
8.13
5.605
1.389
0.741935
20.57
18.51
14.34
8.122
5.499
1.36
0.774194
18.87
17.58
14.15
7.913
5.473
1.354
0.806452
18.84
16.46
12.4
7.868
5.322
1.316
0.83871
18.34
16.45
10.81
7.099
4.887
1.212
0.870968
18.34
16.37
10.8
6.987
4.725
1.169
0.903226
18.34
16.34
10.64
6.557
4.446
1.098
0.935484
18.34
16.29
10.58
5.514
3.742
0.9257
0.967742
18.34
16.17
10.38
4.824
3.258
0.8095
19
0.1
263.9
238.8
145.813
66.34
45.342
11.2233
Average
of
yearly
averages:
3.95984
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DicaLAAr
Metfile:
w13970.
dvf
PRZM
scenario:
LAsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
221.04
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
Solubility
sol
6100
mg/
L
Kd
Kd
mg/
L
Koc
Koc
13.4
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
12
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
423
days
Halfife
Aerobic
Soil
Metabolism
asm
18
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
3.14
kg/
ha
Application
Efficiency:
APPEFF
0.95
fraction
Spray
Drift
DRFT
0.16
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,

DCSA
FL­
Sugarcane
(
Ground)

stored
as
DCSAFLgr.
out
Chemical:
dicamba
PRZM
environment:
FLsugarcaneC.
txt
modified
Satday,
12
October
20
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w12844.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
1.243
1.138
0.7954
0.5673
0.4676
0.1382
1962
3.359
2.916
1.769
0.9972
0.8673
0.2724
1963
9.561
8.737
5.32
2.532
1.836
0.5195
1964
6.828
5.997
4.049
2.797
2.135
0.6127
1965
2.901
2.509
1.79
1.103
0.8277
0.2934
1966
3.094
2.685
1.9
1.368
1.027
0.3388
1967
4.058
3.56
2.58
1.531
1.139
0.3715
1968
6.505
5.663
4.866
3.061
2.283
0.6771
1969
5.996
5.224
3.769
2.362
1.826
0.5535
1970
4.595
3.97
3.276
2.027
1.462
0.4496
1971
5.078
4.559
2.703
1.59
1.311
0.3958
1972
13.48
11.72
7.929
5.287
3.84
1.067
1973
2.425
2.097
1.424
1.135
0.9363
0.3161
1974
1.066
0.9318
0.6087
0.4622
0.463
0.1782
1975
2.152
1.865
1.362
0.9197
0.7765
0.2476
1976
6.27
5.566
3.522
2.329
1.776
0.5192
1977
11.14
9.675
7.088
4.229
3.034
0.8698
1978
2.115
1.827
1.169
1.053
0.9648
0.3199
1979
18.2
15.9
9.859
4.988
3.598
0.9962
1980
3.612
3.145
2.295
1.574
1.258
0.3905
1981
2.74
2.372
1.645
1.059
0.87
0.2811
1982
11.7
10.54
7.088
3.865
2.911
0.8083
1983
2.462
2.226
1.923
1.025
0.8424
0.2724
1984
7.875
6.915
4.308
2.494
1.816
0.5499
1985
2.43
2.133
1.374
1.11
0.8724
0.2908
1986
2.015
1.796
1.338
0.9378
0.7002
0.2479
21
1987
4.987
4.319
2.852
1.546
1.226
0.3647
1988
8.004
7.033
4.393
3.095
2.378
0.6995
1989
10.33
9.641
6.104
2.817
2.013
0.5715
1990
3.093
2.675
1.71
1.109
0.9423
0.309
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
18.2
15.9
9.859
5.287
3.84
1.067
0.064516
13.48
11.72
7.929
4.988
3.598
0.9962
0.096774
11.7
10.54
7.088
4.229
3.034
0.8698
0.129032
11.14
9.675
7.088
3.865
2.911
0.8083
0.16129
10.33
9.641
6.104
3.095
2.378
0.6995
0.193548
9.561
8.737
5.32
3.061
2.283
0.6771
0.225806
8.004
7.033
4.866
2.817
2.135
0.6127
0.258065
7.875
6.915
4.393
2.797
2.013
0.5715
0.290323
6.828
5.997
4.308
2.532
1.836
0.5535
0.322581
6.505
5.663
4.049
2.494
1.826
0.5499
0.354839
6.27
5.566
3.769
2.362
1.816
0.5195
0.387097
5.996
5.224
3.522
2.329
1.776
0.5192
0.419355
5.078
4.559
3.276
2.027
1.462
0.4496
0.451613
4.987
4.319
2.852
1.59
1.311
0.3958
0.483871
4.595
3.97
2.703
1.574
1.258
0.3905
0.516129
4.058
3.56
2.58
1.546
1.226
0.3715
0.548387
3.612
3.145
2.295
1.531
1.139
0.3647
0.580645
3.359
2.916
1.923
1.368
1.027
0.3388
0.612903
3.094
2.685
1.9
1.135
0.9648
0.3199
0.645161
3.093
2.675
1.79
1.11
0.9423
0.3161
0.677419
2.901
2.509
1.769
1.109
0.9363
0.309
0.709677
2.74
2.372
1.71
1.103
0.8724
0.2934
0.741935
2.462
2.226
1.645
1.059
0.87
0.2908
0.774194
2.43
2.133
1.424
1.053
0.8673
0.2811
22
0.806452
2.425
2.097
1.374
1.025
0.8424
0.2724
0.83871
2.152
1.865
1.362
0.9972
0.8277
0.2724
0.870968
2.115
1.827
1.338
0.9378
0.7765
0.2479
0.903226
2.015
1.796
1.169
0.9197
0.7002
0.2476
0.935484
1.243
1.138
0.7954
0.5673
0.4676
0.1782
0.967742
1.066
0.9318
0.6087
0.4622
0.463
0.1382
0.1
11.644
10.4535
7.088
4.1926
3.0217
0.86365
Average
of
yearly
averages:
0.46407
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DCSAFLgr
Metfile:
w12844.
dvf
PRZM
scenario:
FLsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
207
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
Solubility
sol
2112
mg/
L
Kd
Kd
mg/
L
Koc
Koc
1208
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
16.4
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
0
days
Halfife
Aerobic
Soil
Metabolism
asm
24.6
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
0.45
kg/
ha
Application
Efficiency:
APPEFF
1
fraction
Spray
Drift
DRFT
0.064
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,
23
FL­
Sugarcane
(
Aerial)

stored
as
DCSAFLar.
out
Chemical:
dicamba
PRZM
environment:
FLsugarcaneC.
txt
modified
Satday,
12
October
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w12844.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
2.62
2.272
1.392
0.9495
0.7321
0.2084
1962
3.77
3.276
2.007
1.387
1.138
0.3458
1963
9.989
9.138
5.567
2.915
2.101
0.5916
1964
7.414
6.509
4.362
3.102
2.396
0.6835
1965
2.939
2.545
1.826
1.131
1.03
0.3644
1966
3.149
2.738
1.942
1.412
1.288
0.4123
1967
4.097
3.598
2.615
1.563
1.322
0.4439
1968
6.579
5.73
4.935
3.15
2.55
0.7497
1969
6.419
5.62
4.012
2.482
2.089
0.6252
1970
4.641
4.013
3.336
2.068
1.717
0.5192
1971
5.284
4.741
2.819
1.878
1.582
0.469
1972
14.05
12.22
8.383
5.612
4.103
1.139
1973
2.718
2.353
1.583
1.381
1.196
0.3865
1974
2.64
2.306
1.399
0.8208
0.7255
0.2494
1975
2.633
2.299
1.419
1.145
1.041
0.3195
1976
6.364
5.655
3.604
2.527
2.047
0.5928
1977
11.53
10.02
7.303
4.378
3.298
0.9415
1978
2.67
2.34
1.686
1.341
1.228
0.3915
1979
18.99
16.59
10.28
5.224
3.864
1.069
1980
3.724
3.245
2.383
1.949
1.53
0.4643
1981
2.834
2.456
1.703
1.345
1.128
0.3512
1982
12.53
11.26
7.531
4.145
3.17
0.8785
24
1983
2.669
2.343
1.976
1.2
1.112
0.3453
1984
7.969
7
4.371
2.542
2.034
0.6239
1985
4.004
3.513
2.218
1.497
1.141
0.3636
1986
2.639
2.319
1.435
0.9666
0.9627
0.3218
1987
5.241
4.542
3.059
1.92
1.506
0.4406
1988
8.563
7.522
4.692
3.241
2.639
0.7711
1989
11.91
11.01
6.931
3.192
2.272
0.6417
1990
3.187
2.759
1.774
1.374
1.204
0.3798
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
18.99
16.59
10.28
5.612
4.103
1.139
0.064516
14.05
12.22
8.383
5.224
3.864
1.069
0.096774
12.53
11.26
7.531
4.378
3.298
0.9415
0.129032
11.91
11.01
7.303
4.145
3.17
0.8785
0.16129
11.53
10.02
6.931
3.241
2.639
0.7711
0.193548
9.989
9.138
5.567
3.192
2.55
0.7497
0.225806
8.563
7.522
4.935
3.15
2.396
0.6835
0.258065
7.969
7
4.692
3.102
2.272
0.6417
0.290323
7.414
6.509
4.371
2.915
2.101
0.6252
0.322581
6.579
5.73
4.362
2.542
2.089
0.6239
0.354839
6.419
5.655
4.012
2.527
2.047
0.5928
0.387097
6.364
5.62
3.604
2.482
2.034
0.5916
0.419355
5.284
4.741
3.336
2.068
1.717
0.5192
0.451613
5.241
4.542
3.059
1.949
1.582
0.469
0.483871
4.641
4.013
2.819
1.92
1.53
0.4643
0.516129
4.097
3.598
2.615
1.878
1.506
0.4439
0.548387
4.004
3.513
2.383
1.563
1.322
0.4406
0.580645
3.77
3.276
2.218
1.497
1.288
0.4123
0.612903
3.724
3.245
2.007
1.412
1.228
0.3915
25
0.645161
3.187
2.759
1.976
1.387
1.204
0.3865
0.677419
3.149
2.738
1.942
1.381
1.196
0.3798
0.709677
2.939
2.545
1.826
1.374
1.141
0.3644
0.741935
2.834
2.456
1.774
1.345
1.138
0.3636
0.774194
2.718
2.353
1.703
1.341
1.128
0.3512
0.806452
2.67
2.343
1.686
1.2
1.112
0.3458
0.83871
2.669
2.34
1.583
1.145
1.041
0.3453
0.870968
2.64
2.319
1.435
1.131
1.03
0.3218
0.903226
2.639
2.306
1.419
0.9666
0.9627
0.3195
0.935484
2.633
2.299
1.399
0.9495
0.7321
0.2494
0.967742
2.62
2.272
1.392
0.8208
0.7255
0.2084
0.1
12.468
11.235
7.5082
4.3547
3.2852
0.9352
Average
of
yearly
averages:
0.536133
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DCSAFLar
Metfile:
w12844.
dvf
PRZM
scenario:
FLsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
207
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
Solubility
sol
2112
mg/
L
Kd
Kd
mg/
L
Koc
Koc
1208
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
16.4
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
0
days
Halfife
Aerobic
Soil
Metabolism
asm
24.6
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
0.45
kg/
ha
Application
Efficiency:
APPEFF
1
fraction
Spray
Drift
DRFT
0.16
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
26
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,

AL­
Sugarcane
(
Ground)

stored
as
DCSALAgr.
out
Chemical:
dicamba
PRZM
environment:
LAsugarcaneC.
txt
modified
Satday,
12
October
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w13970.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
3.41
3.034
2.489
1.464
1.137
0.3631
1962
9.88
9.092
5.763
2.991
2.257
0.6805
1963
1.106
0.9817
0.6356
0.3182
0.2755
0.1323
1964
3.022
2.659
2.024
1.152
0.8616
0.2692
1965
1.785
1.586
1.088
0.6734
0.5138
0.1679
1966
7.31
6.548
4.46
2.438
1.785
0.5322
1967
3.271
2.897
1.958
1.28
0.9692
0.3248
1968
1.078
0.9594
0.7175
0.4415
0.3233
0.1198
1969
1.064
0.9579
0.8035
0.5646
0.4229
0.1487
1970
3.634
3.311
2.143
1.474
1.093
0.336
1971
1.079
0.9678
0.6823
0.5786
0.4714
0.1747
1972
6.735
6.095
4.538
2.27
1.698
0.5165
1973
13.64
12.27
8.424
4.754
3.408
1
1974
1.361
1.219
0.8775
0.6956
0.5351
0.207
1975
6.814
6.052
4.03
2.182
1.649
0.5073
1976
3.647
3.278
2.184
1.222
0.9546
0.3221
1977
10.16
9.089
6.818
3.613
2.583
0.7698
27
1978
5.705
5.012
3.3
1.79
1.343
0.4513
1979
14.68
13.12
8.769
4.61
3.339
1.002
1980
3.817
3.489
2.335
1.556
1.254
0.4246
1981
3.106
2.756
1.816
1.172
0.9078
0.2875
1982
3.154
2.936
1.925
1.128
0.8256
0.2529
1983
2.437
2.163
1.568
1.153
1.01
0.3226
1984
1.09
0.9684
0.6545
0.5829
0.4563
0.1611
1985
1.063
0.9473
0.6173
0.4334
0.3691
0.1347
1986
2.489
2.224
1.46
1.326
1.036
0.3121
1987
1.474
1.3
0.8817
0.6433
0.5186
0.1888
1988
1.324
1.184
0.8736
0.5321
0.4162
0.1444
1989
5.491
4.981
3.839
2.698
2.067
0.6309
1990
1.106
0.9918
0.7739
0.6021
0.5198
0.1966
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
14.68
13.12
8.769
4.754
3.408
1.002
0.064516
13.64
12.27
8.424
4.61
3.339
1
0.096774
10.16
9.092
6.818
3.613
2.583
0.7698
0.129032
9.88
9.089
5.763
2.991
2.257
0.6805
0.16129
7.31
6.548
4.538
2.698
2.067
0.6309
0.193548
6.814
6.095
4.46
2.438
1.785
0.5322
0.225806
6.735
6.052
4.03
2.27
1.698
0.5165
0.258065
5.705
5.012
3.839
2.182
1.649
0.5073
0.290323
5.491
4.981
3.3
1.79
1.343
0.4513
0.322581
3.817
3.489
2.489
1.556
1.254
0.4246
0.354839
3.647
3.311
2.335
1.474
1.137
0.3631
0.387097
3.634
3.278
2.184
1.464
1.093
0.336
0.419355
3.41
3.034
2.143
1.326
1.036
0.3248
0.451613
3.271
2.936
2.024
1.28
1.01
0.3226
28
0.483871
3.154
2.897
1.958
1.222
0.9692
0.3221
0.516129
3.106
2.756
1.925
1.172
0.9546
0.3121
0.548387
3.022
2.659
1.816
1.153
0.9078
0.2875
0.580645
2.489
2.224
1.568
1.152
0.8616
0.2692
0.612903
2.437
2.163
1.46
1.128
0.8256
0.2529
0.645161
1.785
1.586
1.088
0.6956
0.5351
0.207
0.677419
1.474
1.3
0.8817
0.6734
0.5198
0.1966
0.709677
1.361
1.219
0.8775
0.6433
0.5186
0.1888
0.741935
1.324
1.184
0.8736
0.6021
0.5138
0.1747
0.774194
1.106
0.9918
0.8035
0.5829
0.4714
0.1679
0.806452
1.106
0.9817
0.7739
0.5786
0.4563
0.1611
0.83871
1.09
0.9684
0.7175
0.5646
0.4229
0.1487
0.870968
1.079
0.9678
0.6823
0.5321
0.4162
0.1444
0.903226
1.078
0.9594
0.6545
0.4415
0.3691
0.1347
0.935484
1.064
0.9579
0.6356
0.4334
0.3233
0.1323
0.967742
1.063
0.9473
0.6173
0.3182
0.2755
0.1198
0.1
10.132
9.0917
6.7125
3.5508
2.5504
0.76087
Average
of
yearly
averages:
0.36938
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DCSALAgr
Metfile:
w13970.
dvf
PRZM
scenario:
LAsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
207
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
Solubility
sol
2112
mg/
L
Kd
Kd
mg/
L
Koc
Koc
1208
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
16.4
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
0
days
Halfife
29
Aerobic
Soil
Metabolism
asm
24.6
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
0.45
kg/
ha
Application
Efficiency:
APPEFF
1
fraction
Spray
Drift
DRFT
0.064
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,

AL­
Sugarcane
(
Aerial)

stored
as
DCSALAar.
out
Chemical:
dicamba
PRZM
environment:
LAsugarcaneC.
txt
modified
Satday,
12
October
EXAMS
environment:
ir298.
exv
modified
Thuday,
29
August
Metfile:
w13970.
dvf
modified
Wedday,
3
July
2002
Water
segment
concentrations
(
ppb)

Year
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
1961
4.042
3.595
3.001
1.926
1.461
0.4513
1962
10.69
9.821
6.223
3.372
2.567
0.7666
1963
2.682
2.374
1.51
0.7311
0.5628
0.2123
1964
3.623
3.202
2.565
1.576
1.157
0.3512
1965
3.014
2.675
1.973
1.097
0.8091
0.2503
1966
8.422
7.543
5.102
2.878
2.092
0.6179
1967
3.747
3.319
2.283
1.696
1.259
0.4061
1968
2.654
2.36
1.614
0.872
0.6233
0.2033
1969
2.635
2.363
1.711
1.002
0.7276
0.2335
1970
4.196
3.81
2.762
1.903
1.392
0.4196
1971
2.656
2.378
1.567
1.03
0.7867
0.2623
1972
7.041
6.384
4.777
2.698
1.996
0.5989
1973
15.05
13.53
9.303
5.204
3.722
1.087
30
1974
2.937
2.622
1.783
1.125
0.835
0.2907
1975
7.5
6.662
4.416
2.625
1.961
0.5942
1976
4.019
3.611
2.408
1.669
1.267
0.4095
1977
11.27
10.08
7.477
4.049
2.886
0.8543
1978
6.128
5.385
3.603
2.223
1.644
0.5349
1979
15.72
14.04
9.405
5.026
3.646
1.088
1980
4.067
3.711
2.483
1.997
1.56
0.5097
1981
3.567
3.167
2.173
1.598
1.204
0.37
1982
4.265
3.929
2.784
1.562
1.127
0.3365
1983
2.647
2.385
1.978
1.61
1.337
0.4137
1984
2.655
2.369
1.542
1.023
0.7634
0.2468
1985
2.639
2.351
1.523
0.8687
0.6725
0.2191
1986
3.661
3.269
2.365
1.757
1.336
0.3952
1987
2.654
2.377
1.565
1.086
0.8274
0.2747
1988
2.646
2.462
1.784
0.9711
0.7223
0.2292
1989
5.674
5.154
4.128
2.845
2.371
0.7153
1990
2.682
2.399
1.688
1.037
0.8219
0.2804
Sorted
results
Prob.
Peak
96
hr
21
Day
60
Day
90
Day
Yearly
0.032258
15.72
14.04
9.405
5.204
3.722
1.088
0.064516
15.05
13.53
9.303
5.026
3.646
1.087
0.096774
11.27
10.08
7.477
4.049
2.886
0.8543
0.129032
10.69
9.821
6.223
3.372
2.567
0.7666
0.16129
8.422
7.543
5.102
2.878
2.371
0.7153
0.193548
7.5
6.662
4.777
2.845
2.092
0.6179
0.225806
7.041
6.384
4.416
2.698
1.996
0.5989
0.258065
6.128
5.385
4.128
2.625
1.961
0.5942
0.290323
5.674
5.154
3.603
2.223
1.644
0.5349
0.322581
4.265
3.929
3.001
1.997
1.56
0.5097
31
0.354839
4.196
3.81
2.784
1.926
1.461
0.4513
0.387097
4.067
3.711
2.762
1.903
1.392
0.4196
0.419355
4.042
3.611
2.565
1.757
1.337
0.4137
0.451613
4.019
3.595
2.483
1.696
1.336
0.4095
0.483871
3.747
3.319
2.408
1.669
1.267
0.4061
0.516129
3.661
3.269
2.365
1.61
1.259
0.3952
0.548387
3.623
3.202
2.283
1.598
1.204
0.37
0.580645
3.567
3.167
2.173
1.576
1.157
0.3512
0.612903
3.014
2.675
1.978
1.562
1.127
0.3365
0.645161
2.937
2.622
1.973
1.125
0.835
0.2907
0.677419
2.682
2.462
1.784
1.097
0.8274
0.2804
0.709677
2.682
2.399
1.783
1.086
0.8219
0.2747
0.741935
2.656
2.385
1.711
1.037
0.8091
0.2623
0.774194
2.655
2.378
1.688
1.03
0.7867
0.2503
0.806452
2.654
2.377
1.614
1.023
0.7634
0.2468
0.83871
2.654
2.374
1.567
1.002
0.7276
0.2335
0.870968
2.647
2.369
1.565
0.9711
0.7223
0.2292
0.903226
2.646
2.363
1.542
0.872
0.6725
0.2191
0.935484
2.639
2.36
1.523
0.8687
0.6233
0.2123
0.967742
2.635
2.351
1.51
0.7311
0.5628
0.2033
0.1
11.212
10.0541
7.3516
3.9813
2.8541
0.84553
Average
of
yearly
averages:
0.454083
Inputs
generated
by
pe4.
pl
­
8­
Aug­
03
Data
used
for
this
run:
Output
File:
DCSALAar
Metfile:
w13970.
dvf
PRZM
scenario:
LAsugarcaneC.
txt
EXAMS
environment
file:
ir298.
exv
Chemical
Name:
dicamba
Description
Variable
Name
Value
Units
Comments
Molecular
weight
mwt
207
g/
mol
Henry's
Law
Const.
henry
1.60E­
09
atm­
m^
3/
mol
Vapor
Pressure
vapr
3.41E­
05
torr
32
Solubility
sol
2112
mg/
L
Kd
Kd
mg/
L
Koc
Koc
1208
mg/
L
Photolysis
half­
life
kdp
38.1
days
Half­
life
Aerobic
Aquatic
Metabolism
kbacw
16.4
days
Halfife
Anaerobic
Aquatic
Metabolism
kbacs
0
days
Halfife
Aerobic
Soil
Metabolism
asm
24.6
days
Halfife
Hydrolysis:
pH
7
0
days
Half­
life
Method:
CAM
2
integer
See
PRZM
manual
Incorporati
on
Depth:
DEPI
0
cm
Application
Rate:
TAPP
0.45
kg/
ha
Application
Efficiency:
APPEFF
1
fraction
Spray
Drift
DRFT
0.16
fraction
of
application
Application
Date
Date
15­
04
dd/
mm
or
dd/
mmm
Record
17:
00
FILTRA
IPSCND
1
UPTKF
Record
18:
00
PLVKRT
PLDKRT
FEXTRC
0.5
Flag
for
Index
Res.
Run
IR
IR
Flag
for
runoff
calc.
RUNOFF
total
none,

SCIGROW
VERSION
2.3
ENVIRONMENTAL
FATE
AND
EFFECTS
DIVISION
OFFICE
OF
PESTICIDE
PROGRAMS
U.
S.
ENVIRONMENTAL
PROTECTION
AGENCY
SCREENING
MODEL
FOR
AQUATIC
PESTICIDE
EXPOSURE
SciGrow
version
2.3
chemical:
dicamba
time
is
6/
1/
2005
14:
59:
35
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
33
Application
Number
of
Total
Use
Koc
Soil
Aerobic
rate
(
lb/
acre)
applications
(
lb/
acre/
yr)
(
ml/
g)
metabolism
(
days)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
2.800
1.0
2.800
3.45E+
00
6.0
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
groundwater
screening
cond
(
ppb)
=
1.61E­
02
************************************************************************

SCIGROW
VERSION
2.3
ENVIRONMENTAL
FATE
AND
EFFECTS
DIVISION
OFFICE
OF
PESTICIDE
PROGRAMS
U.
S.
ENVIRONMENTAL
PROTECTION
AGENCY
SCREENING
MODEL
FOR
AQUATIC
PESTICIDE
EXPOSURE
SciGrow
version
2.3
chemical:
DCSA
time
is
6/
1/
2005
15:
0:
52
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
Application
Number
of
Total
Use
Koc
Soil
Aerobic
rate
(
lb/
acre)
applications
(
lb/
acre/
yr)
(
ml/
g)
metabolism
(
days)
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
0.446
1.0
0.446
2.42E+
02
8.2
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
groundwater
screening
cond
(
ppb)
=
8.01E­
03
************************************************************************