Sediment Dredging at Superfund Megasites - Federal Remediation ...

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Evaluation of Dredging Effectiveness• Dredging can cause releases of contaminants duringoperations that increase water column and fish tissuecontaminant concentrations in the short term.(NRC 2007; data from Alcoa 2006)
Evaluation of Dredging Effectiveness• The longer-term benefits to human health and the environment ofdredging contaminated sediments are not well understood ordocumented.– Monitoring at most sites does not include the full array ofmeasures necessary to evaluate risk.– Dredging may have occurred in conjunction with otherremedies or natural processes.– Insufficient time may have passed to evaluate long-term riskreduction.• Due to these deficiencies, the committee was generally unable toestablish whether dredging alone is capable of achieving longtermrisk reduction.
Page 1 and 2: Sediment Dredging atSuperfund Megas
Page 3 and 4: Reviewers of the Final ReportReview
Page 5: Outline• Introduction• Evaluati
Page 9: Evaluation of Dredging Effectivenes
Page 15 and 16: Range of Experiences at Dredging Pr
Page 17 and 18: Manistique River and Harbor•Remov
Page 19 and 20: Evaluation of Dredging Effectivenes
Page 21 and 22: Monitoring at Sediment MegasitesREC
Page 23: Improving Future Decision-Making•

Sediment Dredging at Superfund Megasites - Federal Remediation ...

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