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Figure 4-2. Flowchart illustrating tiered evaluation approach for the effluent pathway |
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 Evaluate Existing Information
For Effluent
Information
YES
Sufficient
For a Decision ?
Tier I
Effluent
NO
Decision
COCs with No WQS or Interactive
Effects of Concern
COCs with WQS
Follow Both Pathways
as Needed
Conduct Screening Evaluations
Tier II
Evaluate Initial Mixing
Information
YES
Sufficient
For a Decision ?
Effluent WQS
NO
Decision
Tier III
Conduct Water Column Toxicity
Conduct EET and LTCST
Tests with EET
Evaluate Initial Mixing
Evaluate Initial Mixing
Information
YES
Sufficient
Effluent WQS
For a Decision ?
Decision
Effluent Toxicity
Decision
NO
EET= Effluent Elutriate Test
LTCST= Long Tube Column Settling Test
Case Specific Study
Or
Tier IV
Risk Assessment
Effluent
Decision
Figure 4-2.
Flowchart illustrating tiered evaluation approach for the effluent pathway
4-6
Chapter 4
Effluent During Disposal Operations
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