![]() ![]() Residual contaminated sediment is left behind during dredging and results from settling of resuspended sediment.Release of contaminants from the resuspended sediments and bedded sediments occurs during and immediately subsequent to dredging.Resuspension of contaminated sediment, which occurs to some degree during dredging operations.Several issues must be considered during the design and implementation of every environmental dredging project. Even if the primary objective of dredging was not to remove a contamination source, if the sediments contain contaminants, special care is still required to address issues associated with environmental dredging as described herein. In some cases, dredging is performed to increase water depths, which may be needed for vessel navigation, flood protection, and other future uses of a waterbody. Contamination in near-surface sediments may become resuspended and transported by natural erosive processes, so that near-surface contaminated sediment may be classified as a contamination "source". It is effective in removing contaminant mass from near-surface sediments. Other Technology NamesĮnvironmental dredging reduces ecological and human health risks from exposure to contaminated sediments by removing the source of contamination (i.e., the contaminated sediment). Environmental dredging is performed to reduce risk that contaminated sediment and associated porewater pose to human health and the environment. IntroductionĮnvironmental dredging is the process where contaminated sediment under water is removed, treated, and/or placed in a new location. This information may be reproduced without restriction as long as the source attribution is included. Schematic of Hydraulic Dredge and PipelineĮxample of Dredging, Dewatering and Water Treatment Process Schematic of Mechanical Dredge and Haul Barge ![]()
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