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November 15, 2005 The Water Report <br />Sediments <br />Phased <br />Evaluation <br />The testing proposed under the SEF can be expensive. One of the goals of the SEF is to develop and <br />refine procedures that reduce the cost of contaminated sediment investigations and dredged material <br />testing while providing appropriate evaluation of the potential environmental impacts. <br />Multiple Lines & Levels of Evidence <br />The types and amount of information necessary to reach management decisions will vary from site <br />to site or project to project. Most sediment assessments and dredged material characterizations will <br />involve the use of a variety of physical, chemical, and biological information in order to reach decisions <br />about the presence /absence of risk and how best to manage evident risk when determining appropriate <br />disposal /remediation options. The basic framework proposed in the Draft SEF consists of a phased <br />evaluation process that is consistent with available and upcoming national guidance. A generalized <br />sediment evaluation framework is presented in Figure 2. <br />Figure 2. Generalized Sediment Evaluation Framework to Make Management Decisions <br />J <br />w <br />w <br />J <br />Define Project Scope <br />• Project Goals <br />• Existing Information <br />• Conceptual Site Model (CSM) <br />Screening Assessment <br />• Compare Existing Data to Screening <br />Guidelines <br />• Contaminants of Concern <br />Collection of Initial Physical /Chemical Data <br />j Is existing or <br />\\ <br />j collected information <br />Additional <br />Management <br />sufficient <br />Chemical Issues <br />Decision <br />for a management <br />Non - standard <br />w <br />> <br />decision? <br />Contaminants of <br />w <br />J <br />N <br />Concern <br />• Fate and <br />1 <br />Direct <br />Transport Issues <br />Direct Water <br />Define Project Scope <br />• Project Goals <br />• Existing Information <br />• Conceptual Site Model (CSM) <br />Screening Assessment <br />• Compare Existing Data to Screening <br />Guidelines <br />• Contaminants of Concern <br />Collection of Initial Physical /Chemical Data <br />j Is existing or <br />\\ <br />j collected information <br />Y <br />Management <br />sufficient <br />Decision <br />for a management <br />decision? <br />N <br />1 <br />Direct <br />Indirect <br />Direct Water <br />Column Effects <br />Benthic Effects <br />Bioaccumulation <br />Effects <br />• Elutriate Tests <br />Solid Phase <br />gioaccumulation <br />• Models <br />Toxicity Tests <br />Tests <br />• Fish Tissue <br />Monitoring <br />• Models <br />• Risk Assessment <br />Management <br />Decision <br />Copyright© 2005 Envirotech Publications; Reproduction without permission strictly prohibited. 11 <br />