Sediment Dredging at Superfund Megasites ... - Emsus.com

Evaluation of Dredging Effectiveness• Operational goals (mass removal or dredging toelevation) were achieved at many sites.• Dredging is effective at removing large volumes ofcontaminated sediments from the environment.– This doesn’t necessarily equate to risk reduction, but can beuseful if those sediments are likely to be transported to lesscontaminated areas.• Dredging alone achieved desired contaminant-specificcleanup levels at only a few of the reviewed sites.– Capping after dredging was often necessary to achieve cleanuplevels.• At some sites, dredging achieved cleanup levels andpresumably contributed to declines in biota contaminantconcentrations.