EPA ID# WA8680030931
EPA Region 10
Kitsap County

6th Congressional District

Other Names: Manchester Annex
Last Update: August, 2007

Hide details for Site DescriptionSite Description

The Old Navy Dump/Manchester Laboratory (USEPA/NOAA) site is located along the western shore of Clam Bay, which is an embayment west of Rich Passage in the Puget Sound. The site is approximately 1 miles north of Manchester, Washington. Federal ownership of this site started in 1898 with the U.S. Army. In 1924, the entire site was transferred to the U.S. Navy. From the 1940s to the 1960s, the Navy used the site primarily for construction, repair, maintenance, and storage of submarine nets and boats. The Navy also used the site for fire fighter training and as a dump for wastes generated at the site and from the Puget Sound Naval Shipyard in Bremerton, Washington. Portions of the site extended onto an adjacent State park, a Navy fuel supply depot, and the marine tidelands of Clam Bay. Clam Bay has been used primarily for recreational shellfishing and is also known to be used by the bald eagle and chinook salmon, federally-threatened species designated under the Endangered Species Act.

The former fire fighter training activities contaminated soil with dioxins and petroleum hydrocarbons in an area that was subsequently called the “former fire fighter training area.” The dumping of approximately 70,000 cubic yards of demolition debris and industrial waste, including asbestos, into a former tidal lagoon caused contamination of soil, sediment, seep water, and shellfish in Clam Bay with polychlorinated biphenyls (PCBs) and/or metals. These areas were subsequently called the “landfill area and Clam Bay sediments.”

In the early 1970s, EPA and the National Oceanic and Atmospheric Administration (NOAA) acquired portions of the property. The site is currently occupied by an EPA analytical laboratory and a NOAA fisheries research laboratory.

Site Responsibility: This site is being addressed through federal actions.

NPL Listing HistoryDates
Proposed Date:01/18/1994
Removed Date:
Withdrawal Date:
Final Date:05/31/1994
Deleted Date:

Hide details for Threats and ContaminantsThreats and Contaminants

Media Affected: Soil, Seep Water, Sediment, and Shellfish
Former fire fighter training activities contaminated areas of soil with dioxins and petroleum hydrocarbons. Waves from Clam Bay caused erosion and leaching of the dumped waste from the “landfill area” into Clam Bay, resulting in contamination of sediment and shellfish in the near-shore area of Clam Bay. The sediment was contaminated primarily with PCBs and metals (copper, lead, and zinc), and the shellfish in Clam Bay were contaminated primarily with PCBs. Seeps discharging from the dump also contained elevated levels of copper, nickel, zinc and PCBs. Threats to human health by touching or ingesting contaminated soil, sediment, and shellfish were evaluated, and threats to plants and wildlife were also evaluated based on ingestion and toxicity of these chemicals.

Hide details for Cleanup ProgressCleanup Progress

EPA and the U.S. Army Corps of Engineers completed a thorough site investigation in 1997 regarding the nature and extent of the contamination and developed long-term cleanup alternatives. Based on the 1997 investigation, potential health risks were determined to be minimal for the Navy Fuel Supply Depot, State Park area, and site groundwater; consequently, no cleanup measures were proposed for those areas. A Proposed Cleanup Plan for the remaining areas (former fire fighter training area, landfill area, and Clam Bay sediments) was then released for public comment in April 1997. EPA and the Department of Defense selected a remedy for the site and issued a Record of Decision in September 1997. A detailed design of the remedy was completed in June 1999, and construction of the remedy began in the same month. The remedy for the site included removal of contaminated soil and structures in the former fire fighter training area; construction of a landfill cap and shoreline protection system; placement of clean sediment in the nearshore area to enhance natural recovery of the sediments; and a temporary ban on subsistence-level shellfish harvesting until it can be determined that clams are safe for subsistence-level harvesting. Part of the remedy for the site also included a plan for long-term monitoring of the seeps, sediment, and shellfish to assess recovery. Construction activities were completed in early 2001 and a formal review of the effectiveness of the remedy was completed in 2004.

The formal review concluded that the landfill cap, shoreline protection system, and remedial activities in the former fire fighter training area have achieved the intended goal of reducing risks to human health and the environment. Long-term monitoring at the site will continue.

Show details for Regional ContactsRegional Contacts