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Page Title: 6.5 Tier IV - Leachate Risk Assessment
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6.5 Tier IV - Leachate Risk Assessment
6.5.1 Evaluation
Tier IV is intended to answer whatever specific, well-defined technical
questions may remain unanswered after thorough evaluation in earlier tiers. If
earlier tiers are used properly, Tier IV should rarely be necessary.
By the nature of the tiered evaluation approach, any technical questions that
remain unresolved after Tier III can best be answered by a detailed, case-specific
evaluation. By their very nature, detailed case-specific evaluations are not
amenable to the kind of generic guidance that can be presented in a national
manual. They require individual design to address unique technical questions
under site-specific conditions.
The best approach for Tier IV is usually a case-specific risk assessment.
Detailed guidance for conducting risk assessments for CDFs in Tier IV can be
found in Cura, Wickwire, and McArlde (in preparation). The information
generated in Tiers I through III should be used to the maximum extent technically
justified throughout the Tier IV risk assessment.
6.5.2 Tier IV Leachate Decision
After consideration of the Tier IV leachate evaluation results, all relevant
information is available and no further evaluation is possible. One of the
following conclusions is reached.
1. No management actions are required.
2. Management actions should be considered. A decision to implement
management actions for leachate, such as lining or operational
modification, may require more detailed information prior to design of
such actions.
6.6 Leachate Management Actions
If evaluation of the leachate pathway indicates leachate is of concern after
consideration of attenuation, appropriate actions to manage leachate may be
considered. These may include modification of the operation (e.g., encapsulating
the contaminated dredged material between cleaner layers of materials), liners and
leachate collection systems, and low permeability cover systems, among other
approaches. Additional information on management actions and references for
detailed guidance on such actions is found in Chapter 10 of this manual.
6-16
Chapter 6
Leachate to Groundwater

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