The 53-acre Old Navy Dump/Manchester Laboratory site is located north of Manchester, Washington, along the western shore of Clam Bay in Puget Sound. 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 firefighter training and as a dump for wastes generated at the site. Former firefighter training activities contaminated soil with dioxins and petroleum hydrocarbons. The Navy dumped demolition debris and industrial waste, including asbestos, into a former tidal lagoon, causing contamination of soil, sediment, seep water and shellfish in Clam Bay with polychlorinated biphenyls (PCBs) and metals. Following cleanup, operation and maintenance activities and monitoring are ongoing.