In-Water Earthwork and Dredging

The contract involves marine excavation of 65,000 cubic yards and the placement of 30,000 cubic yards of clean fill within the Duwamish River, subject to strict seasonal constraints aligned with fish and tidal work windows to minimize environmental impact. All work must adhere to regulatory timelines that protect aquatic species and tidal rhythms, requiring precise scheduling and operational controls. The project is classified under NAICS code 237990 for other heavy and civil engineering construction and is structured as a subcontract under the Port of Seattle’s Waterfront Project Management division. Execution must occur entirely within the designated work area in the river, with compliance to environmental and regulatory standards being central to all phases of the operation.