Hylebos Wood Debris Group

In 1997, as sediment cleanup in the Commencement Bay National Priority List site began, several wood product companies formed the Hylebos Wood Debris Group (WDG) to address in-water cleanup issues related to wood debris in the head of the waterway. Floyd|Snider successfully negotiated separating of the head of the Hylebos Waterway from the remainder of the Hylebos Superfund operable unit in order to facilitate the State of Washington’s leading role under Sediment Management Standards, thereby expediting the cleanup process. In 1998, the WDG entered into an Agreed Order with the Washington State Department of Ecology to investigate potential wood debris impacts to sediment quality and biota, and to conduct remedial actions. Floyd|Snider led the Hylebos Waterway Wood Debris Program, managing multiple sub-consultants with a broad range of specialties, and providing technical expertise for sediment and upland source characterization, biological surveys, and chemical and biological data analyses. 

The Floyd|Snider Team prepared several project reports, including a Cleanup Study Report, Cleanup Action Plan, Cleanup Action Design Report, and Construction Plans and Specifications. The Cleanup Study Report characterized the nature and extent of wood debris in the Upper Turning Basin of the waterway and carefully defined the natural circulation patterns in the basin, which significantly affect the levels of dissolved oxygen present. Based on this work, it was demonstrated that wood debris in the waterway has a much less significant impact on dissolved oxygen levels than impacts from natural circulation patterns. This finding considerably reduced the quantity of wood debris that required removal, thereby reducing cleanup costs. The Cleanup Action Plan and associated Consent Decree (the State’s equivalent of a Comprehensive Environmental Response, Compensation, and Liability Act [CERCLA] Record of Decision) were completed in 2000.  Floyd|Snider developed design and permitting documents, coordinated permitting actions, including Environmental Site Assessment consultation, with the adjacent Commencement Bay CERCLA processes, and performed construction management during the WDG’s first remedial dredging action in 2001. Construction management services included oversight and monitoring, coordination with multiple agencies, and preparation of closure/construction completion reports. Additionally, Floyd|Snider assisted the WDG in obtaining special group insurance coverage for the project and in evaluating potential Water Resources Development Act funding.


  • Agency Coordination and Negotiation
  • Permitting
  • Design and Bid Package Preparation
  • Construction Management
  • Natural Resource Damage Settlement

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