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Page Title: 4.1.5 Data Requirements
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consideration of mixing in evaluating dredged material releases, as does the
MPRSA.
Mixing calculations describe the spatial and temporal boundaries within
which the discharge will reach the water quality standards (WQS). If these
boundaries are within the established mixing zone limits, there should not be an
effect. If these boundaries exceed the established mixing zone limits, there may
be an effect.
Procedures for evaluation of initial mixing are presented in Appendix E.
4.1.5 Data Requirements
Data requirements for effluent evaluations include those pertaining to
operational considerations (i.e., CDF site characteristics and dredge
characteristics) and those pertaining to the properties of the dredged material (i.e.,
contaminant release characteristics and sedimentation characteristics). Data
relating to operational considerations are usually determined by the disposal area
design and by experience in dredging and disposal activities for the project under
consideration or for similar projects. Data relating to the dredged material
characteristics are obtained by sampling and testing the sediments to be dredged.
The process described in Section 3.4 should identify the case-specific effluent
COC for effluent quality evaluations in all tiers. In addition to typical
contaminants, WQS may exist for nutrients and physical parameters such as
temperature, dissolved oxygen, pH, and turbidity or total suspended solids (TSS).
Chlorides should be considered a potential COC whenever there is the potential
for effluent from saline dredged material to enter a fresh water system. If the
effluent pathway is of concern from the standpoint of contaminants, the retention
of TSS within the CDF is of paramount importance, and TSS and/or turbidity
should be considered a COC for the effluent pathway. Effluent elutriate tests and
column settling tests provide the remaining data required for prediction of the
quality of the effluent in Tier III. A summary of the data requirements for effluent
quality prediction is given in Table 4-1.
4-4
Chapter 4
Effluent During Disposal Operations

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