EPA ID# WA8680030931
EPA Region 10
Kitsap County

6th Congressional District

Other Names: Manchester Annex
Last Update: August, 2007

Show details for Site DescriptionSite Description
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.

Hide details for Regional ContactsRegional Contacts

E-MAIL ADDRESS:lynch.kira@epa.gov
PHONE NUMBER:206-553-2144

Matthew Allen
E-MAIL ADDRESSmay.g.carrell@usace.army.mil
PHONE NUMBER:206-764-3418

Kathleen Veit
Information pertaining to this site is housed at the following location(s):
US Army Corps of Engineers (Administrative Record)
4735 East Marginal Way South
Seattle, Washington 98124-2255

Manchester Public Library (Selected Documents)
8067 East Main Street