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Regulatory Framework
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Tier I Evaluation
4
Uncertainty in Tiered
Evaluation of Dredged Material
This section outlines important sources of uncertainty in the evaluation of
potential environmental impacts of dredged material disposal. Uncertainty
sources are discussed within the USACE/USEPA tiered evaluation structure
(Figure 1).
TIER I
EVALUATE
(Generally
EXISTING
represents existing
INFORMATION
information)
WATER
SEDIMENT
COLUMN
MEASURE AND MODEL
CALCULATE THEORETICAL
DISSOLVED CONTAMINANTS
BIOACCUMULATION
Compare to surface water
POTENTIAL
TIER II
quality standards
Compare to reference
TIER III
MEASURE TOXICITY
MEASURE TOXICITY
Model suspended phase
Solid phase tests
(Generic bioassay
Determine toxicity after
Measure bioaccumulation
tests for toxicity
mixing
and compare to Food &
and
Drug Administration (FDA)
bioaccumulation)
limits and to reference
CONDUCT CASE-SPECIFIC
CASE-SPECIFIC TOXICITY
TOXICITY TESTS
TIER IV
Bioaccumulation tests
(Specific
Other tests
bioassay tests,
Risk assessment
risk assessment)
Figure 1.
USACE/USEPA tiered evaluation of dredged material for disposal (after ITM
(USEPA/USACE 1998))
14
Chapter 4 Uncertainty in Tiered Evaluation of Dredged Material

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