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Evaluate Existing Information
For Volatiles
Tier I
Information
YES
Sufficient
For a Decision ?
Volatiles
NO
Decision
Conduct Screening Evaluations
Evaluate Dispersion
Tier II
Information
YES
Sufficient
For a Decision ?
Volatiles
NO
Decision
Conduct Volatile Flux Chamber Tests
Evaluate Dispersion
Tier III
Information
YES
Sufficient
For a Decision ?
Volatiles
Decision
NO
Case Specific Study
Or
Risk Assessment
Volatiles
Decision
Figure 7-2. Flowchart illustrating tiered approach for evaluation of the volatile pathway
7-6
Chapter 7
Guidance for Evaluation of Volatile Emissions
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