![]() ![]() ![]() Evaluation of success determinants, site-measure compatibility, and determination of supplementary measures are keys to achieving and sustaining the projected benefits of remedial dredging and justifying its overall cost. Nevertheless, the sustainability of these recorded positive effects cannot be ascertained as some studies have reported long-term regression in remediated sites’ conditions. Despite its immediate negative impacts including saturation of water with toxic metals, increased turbidity, and sediment resuspension, positive impacts can be recorded over a stabilization period of 6–24 months after dredging. In terms of the short-term impacts of remedial dredging, mixed results are reported in several studies. Waterway and Marine Construction, Waterway and Marine Construction and Equipment, Dredging.Toxic metal pollution is a leading environmental concern for aquatic systems globally, and remedial dredging has been widely employed to mitigate its harmful impacts. The tidal flats will require backfilling with sand material and restoration of a relatively small area of salt marsh. This material will require segregation during dredging. A small portion of this material requires off-site disposal at RCRA D (solid waste) and TSCA approved landfills. Dredged material must be dewatered, solidified with cementitious materials, and placed on-site for future beneficial re-use. Approximately 140,000 cubic yards (cy) of material need to be removed from the tidal flats and an additional 5,000 cy from the drainage channel. Work consists of environmental remediation via mechanical dredging of the tidal flats and an outfall drainage channel adjacent to the Stratford Army Engine Plant to remediate metals and PCBs affected sediments. ![]() Sources Sought Announcement for Environmental Remediation Dredging of tidal flats and an outfall drainage channel in the Housatonic River adjacent to the Stratford Army Engine Plant, Stratford, Connecticut: ![]()
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