Table 4-4: Quantitative Risk Characterization for Aquatic Species.
Risk Quotients
Central
Lower
Upper
Endpoint
Fish
Acute
5.0e-02
1.6e-03
1.6e-01
Mortality
Chronic
2.0e-04
1.6e-06
3.8e-04
Based on acute toxicity.
See text for discussion.
Aquatic
Invertebrates
Acute
2.3e-02
7.2e-04
7.2e-02
Mortality
Chronic
9.2e-05
7.2e-07
1.7e-04
Based on acute toxicity.
See text for discussion.
Aquatic Plants
Acute
2.4e-01
7.5e-03
7.5e-01
EC
50
Chronic
9.6e-04
7.5e-06
1.8e-03
Exposures (mg/L)
Central
Lower
Upper
Worksheet
Acute
0.060
0.0019
0.19
F06
Stream
Longer-term
1
0.00024
0.0000019
0.00045
F09
Toxicity values (mg/L)
Value (mg/L)
Endpoint
Section
Fish, acute
1.2
Mortality
4.3.3.2.
Fish, chronic
1.2
No data found. Acute value
4.3.3.2.
used.
Aquatic
Invertebrates, acute
2.6
Mortality
4.3.3.3
Aquatic Invertebrates, chronic
2.6
No data found. Acute value
4.3.3.3
used.
Aquatic plants
0.25
50
4.3.3.4.
SPECIAL NOTE: All risk characterizations are based on toxicity of formulated product, POAST. Sethoxydim
is much less toxic to aquatic species than is POAST.
4-25
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