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Environmental investigations focused on two basic concerns. The first was whether contaminants escaped from locations where the Port of Portland disposed of dredged materials within the Ross Island Lagoon. Between 1992 and 1998, the Port of Portland received state and federal authorization to bury contaminated dredged materials from the Portland shipyard and Port terminals in underwater disposal areas, called confined aquatic disposal cells. The Port investigated whether the original disposals were properly handled and whether any contaminants escaped into the environment.
The second concern was potential environmental impacts of upland and in-water disposals at the island complex from sources other than the Port of Portland. Ross Island Sand & Gravel, owner of the islands and lagoon, conducted an assessment to determine what, if any, effects such disposals had. The company also investigated the nature and extent of contaminant releases caused by the breaching of a Port disposal cell during gravel mining operations. The Oregon Department of Environmental Quality provided oversight and coordinated both efforts to assure that the work met objectives.
Fill evaluation is the process by which DEQ and other state and federal agencies involved in Ross Island Lagoon's reclamation determine what types of material can be placed there. The 2003 Fill Evaluation scope of work outlines the various types of dredged materials that can be placed in the water at Ross Island, including some contaminated material, as long as all necessary guidelines are followed to properly contain the contamination. DEQ establishes the standards for different types of materials that can be placed in Ross Island Lagoon to ensure the fill used in the reclamation process would not pose a risk to human health or the environment. Ross Island Sand & Gravel submits annual reports documenting fill source and quality to DSL as part of the reclamation permit requirements.
Starting in January 2021, DEQ will begin the process of updating the fill evaluation process. This includes re-examining the Ross Island screening criteria to better align with existing screening criteria used to evaluate sediment quality within the Lower Willamette River. These updates are needed to improve clarity in the sediment evaluation process, promote consistency and ensure that disposal decisions are based on the best available science. Updates to the fill evaluation process will support ongoing efforts to meet the 2002 Ross Island Lagoon reclamation goals.
Three maintenance dredge projects completed during the 2020 in-water work window placed dredged sediments in Ross Island lagoon. These projects are listed below.
Depending on work being performed, Ross Island Sand & Gravel operates under three separate, but closely related, regulatory systems. The Oregon Department of State Lands regulates placement of reclamation fill within the island complex (Oregon DSL permit 9819-RF [RF-26]). Fill operations are also covered by the federal Clean Water Act section 404 permit process administered by the U.S. Corps of Engineers (USACE permit NWP-1999-1500). The Department of Environmental Quality plays a decisive role in the Corps section 404 process through state authority to issue or deny a section 401 certification. A 401 Certification from DEQ puts the state on record that certain in-water activities will not violate water quality standards.
If you have additional questions, contact:
Sarah Greenfield Project Manager 503-229-5245
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