Document ID: EPA-HQ-OPP-2005-0495-0013
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2005-12-21T05:00Z

­
D­
1­
APPENDIX
D.
T­
REX
Model
(
T­
REX
Version
1.1)
 
Model
Overview
and
Results
Imazapyr
­
high
application
rate
non­
cropped
use
scenario
Upper
Bound
Kenaga
Residues
For
RQ
Calculation
Chemical
Name:
Imazapyr
Use
Railroad
­
high
app
rate
Formulation
Arsenal
(
isopropylamine
salt
solution)

Application
Rate
1.5
lbs
a.
i./
acre
Half­
life
35
days
Application
Interval
1
days
Maximum
#
Apps./
Year
1
Length
of
Simulation
1
year
Concentration
of
Concern
0
(
ppm)

Name
of
Concentration
of
Concern
Avian
acute
LC50
Endpoints
Avian
Bobwhite
quail
LD50
(
mg/
kg­
bw)
2150
Bobwhite
quail
LC50
(
mg/
kg­
diet)
5000
Bobwhite
quail
NOAEL
(
mg/
kg­
bw)
0
Bobwhite
quail
NOAEC
(
mg/
kg­
diet)
1670
Mammals
LD50
(
mg/
kg­
bw)
5000
LC50
(
mg/
kg­
diet)
0
NOAEL
(
mg/
kg­
bw)
738
NOAEC
(
mg/
kg­
diet)
10000
EECs
(
ppm)
Kenaga
Values
Short
Grass
360.00
Tall
Grass
165.00
Broadleaf
plants/
sm
Insects
202.50
Fruits/
pods/
seeds/
lg
insects
22.50
­
D­
2­
Avian
Results
Upper
Bound
Avian
Body
%
body
wgt
Adjusted
Class
Weight
consu
med
LD50
Small
20
114
1548
Mid
100
65
1971
Large
1000
29
2785
EEC
equivalent
dose
(
mg/
kg­
bw)
Avian
Classes
and
Body
Weights
small
mid
large
20
g
100
g
1000
g
Short
Grass
410
234
104
Tall
Grass
188
107
48
Broadleaf
plants/
sm
Insects
231
132
59
Fruits/
pods/
lg
insects
26
15
7
Dose­
based
RQs
(
daily
dose/
LD50)
Avian
Acute
RQs
20
g
100
g
1000
g
Short
Grass
0.27
0.12
0.04
Tall
Grass
0.12
0.06
0.02
Broadleaf
plants/
sm
insects
0.15
0.07
0.02
Fruits/
pods/
lg
insects
0.02
0.01
<
0.01
Dietary­
based
RQs
(
EEC/
LC50
or
NOAEC)
RQs
Acute
Chronic
Short
Grass
0.07
0.22
Tall
Grass
0.03
0.10
Broadleaf
plants/
sm
Insects
0.04
0.12
Fruits/
pods/
lg
insects
<
0.01
0.01
­
D­
3­
Imazapyr
Railroad
­
high
app
rate
Upper
bound
Kenaga
Residues
Mammalian
Results
Mammalian
Body
%
body
wgt
Adjusted
Adjusted
Class
Weight
consu
med
LD50
NOAEL
15
95
10989
1622
Herbivores/
35
66
8891
1312
insectivores
1000
15
3846
567
15
21
10989
1622
Grainvores
35
15
8891
1312
1000
3
3846
567
EEC
equivalent
dose
(
mg/
kg­
bw)
Mammalian
Classes
and
Body
weight
Herbivores/
insectivores
Granivor
es
15
g
35
g
1000
g
15
g
35
g
1000
g
Short
Grass
343
237
54
Tall
Grass
157
109
25
Broadleaf
plants/
sm
Insects
193
133
31
Fruits/
pods/
seeds/
lg
insects
21
15
3
5
3
1
Dose­
based
RQs
(
daily
dose/
LD50
or
NOAEL)
15
g
mammal
35
g
mammal
1000
g
mammal
Acute
Chronic
Acute
Chronic
Acute
Chronic
Short
Grass
0.03
0.21
0.03
0.18
0.01
0.10
Tall
Grass
0.01
0.10
0.01
0.08
0.01
0.04
Broadleaf
plants/
sm
insects
0.02
0.12
0.02
0.10
0.01
0.05
Fruits/
pods/
lg
insects
<
0.01
0.01
<
0.01
0.01
<
0.01
0.01
Seeds
(
granivore)
<
0.01
<
0.01
<
0.01
<
0.01
<
0.01
<
0.01
Dietary­
based
RQs
(
EEC/
LC50
or
NOAEC)
Mammal
RQs
(
no
dietary
LC50)
Acute
Chronic
Short
Grass
NA
0.02
Tall
Grass
NA
0.01
Broadleaf
plants/
sm
insects
NA
0.01
­
D­
4­
Fruits/
pods/
seeds/
lg
insects
NA
<
0.01
Mean
Kenaga
Residues
Chemical
Name:
Imazapyr
Use
Railroad
­
high
app
rate
Formulation
Arsenal
(
isopropylamine
salt
solution)
Application
Rate
1.5
lbs
a.
i./
acre
Half­
life
35
days
Application
Interval
1
days
Maximum
#
Apps./
Year
1
Length
of
Simulation
1
year
Concentration
of
Concern
0.00
(
ppm)

Name
of
Concentration
of
Concern
Avian
acute
LC50
Endpoints
Avian
Bobwhite
quail
LD50
(
mg/
kg­
bw)
2150
Bobwhite
quail
LC50
(
mg/
kg­
diet)
0
Bobwhite
quail
NOAEL
(
mg/
kg­
bw)
0
Bobwhite
quail
NOAEC
(
mg/
kg­
diet)
1670
Mammals
LD50
(
mg/
kg­
bw)
5000
LC50
(
mg/
kg­
diet)
0
NOAEL
(
mg/
kg­
bw)
300
NOAEC
(
mg/
kg­
diet)
0
EECs
(
ppm)
Kenaga
Values
Short
Grass
127.50
Tall
Grass
54.00
Broadleaf
plants/
sm
Insects
67.50
Fruits/
pods/
seeds/
lg
insects
10.50
­
D­
5­
Avian
Results
Avian
Body
%
body
wgt
Adjusted
Class
Weight
consume
d
LD50
Small
20
114
1522
Mid
100
65
1938
Large
1000
29
2737
EEC
equivalent
dose
(
mg/
kgbw
Avian
Classes
and
Body
Weights
small
mid
large
20
g
100
g
1000
g
Short
Grass
145
83
37
Tall
Grass
62
35
16
Broadleaf
plants/
sm
Insects
77
44
20
Fruits/
pods/
lg
insects
12
7
3
Dose­
based
RQs
(
daily
dose/
LD50)
Avian
Acute
RQs
20
g
100
g
1000
g
Short
Grass
0.10
0.04
0.01
Tall
Grass
0.04
0.02
0.01
Broadleaf
plants/
sm
insects
0.05
0.02
0.01
Fruits/
pods/
lg
insects
0.01
<
0.01
<
0.01
Dietary­
based
RQs
(
EEC/
LC50
or
NOAEC)
RQs
Acute
Chronic
Short
Grass
0.03
0.08
Tall
Grass
0.01
0.03
Broadleaf
plants/
sm
Insects
0.01
0.04
Fruits/
pods/
lg
insects
<
0.01
0.01
­
D­
6­
Imazapyr
Railroad
­
high
app
rate
Mean
Kenaga
Residues
Mammalian
Results
Mammalian
Body
%
body
wgt
Adjusted
Adjusted
Class
Weight
consume
d
LD50
NOAEL
15
95
10989
1622
Herbivores/
35
66
8891
1312
insectivores
1000
15
3846
567
15
21
10989
1622
Grainvores
35
15
8891
1312
1000
3
3846
567
EEC
equivalent
dose
(
mg/
kgbw
Mammalian
Classes
and
Body
weight
Herbivores/
insectivores
Granivore
s
15
g
35
g
1000
g
15
g
35
g
1000
g
Short
Grass
121
84
19
Tall
Grass
51
36
8
Broadleaf
plants/
sm
Insects
64
45
10
Fruits/
pods/
seeds/
lg
insects
10
7
2
2
2
<
1
Dose­
based
RQs
(
daily
dose/
LD50
or
NOAEL)
15
g
mammal
35
g
mammal
1000
g
mammal
Acute
Chronic
Acute
Chronic
Acute
Chronic
Short
Grass
0.01
0.07
0.01
0.06
<
0.01
0.03
Tall
Grass
0.00
0.03
<
0.01
0.03
<
0.01
0.01
Broadleaf
plants/
sm
insects
0.01
0.04
0.01
0.03
<
0.01
0.02
Fruits/
pods/
lg
insects
0.00
0.01
0.00
0.01
<
0.01
<
0.01
Seeds
(
granivore)
0.00
<
0.01
0.00
<
0.01
<
0.01
<
0.01
Dietary­
based
RQs
(
EEC/
LC50
or
NOAEC)
Mammal
RQs
Acute
Chronic
Short
Grass
NA
0.01
Tall
Grass
NA
<
0.01
Broadleaf
plants/
sm
insects
NA
<
0.01
­
D­
7­
Fruits/
pods/
seeds/
lg
insects
NA
<
0.01