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Page Title: 2.1.1 Tier I
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contamination is not likely to be a concern, further evaluation in subsequent tiers
will not increase the degree of confidence or certainty about the nature of the
material. Evaluation in progressively higher tiers should be conducted only if the
information at a given tier is not sufficient to make a decision regarding the need
for management actions. Once the information necessary and sufficient to make a
decision is available, further evaluation in subsequent tiers will not increase the
confidence in the decision, is a waste of time and resources, and should not be
conducted.
The overall evaluation process is illustrated as a flowchart in Figure 2-1. The
tiered structure for each pathway is illustrated in matrix form in Table 2-1. The
general intent of each of the tiers is described below. More detailed tiered
structures specific to each pathway are discussed in Chapters 4 through 9.
2.1.1 Tier I
Tier I uses readily available existing information. The Tier I evaluation should
determine the need for evaluation of pathways, identify the pathways (if any) that
should be evaluated further, and identify receptors of concern (ROC) and COC (if
any) for further evaluation.
Although gathering such information may require searching libraries,
archives, and similar sources, such as previous project files, the collection of field
data or pathway tests is outside the scope and intentions of this tier. For dredged
material with a readily apparent need for management actions (or lack thereof),
the information collected in Tier I should be sufficient for making management
decisions. However, more extensive evaluation in subsequent tiers will be needed
if Tier I information is inadequate for management decisions.
2.1.2 Tier II
If a decision cannot be made at Tier I, Tier II evaluations consist of
determining the need for management actions derived from very conservative
techniques that use the chemical, physical, and biological characteristics of the
dredged material and basic information about the CDF. Because of their
conservative nature, if these evaluations indicate that management actions are not
needed, it is very unlikely that further evaluations will indicate such a need.
However, because of their conservative nature, "false positives" may occur and,
depending on the magnitude of such results, further evaluation in higher tiers may
be warranted. Tier II includes tests to evaluate the need for management actions to
meet applicable water quality standards, groundwater standards, etc.
2-2
Chapter 2 Structure and Approach of the UTM

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