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1980 Ecology sediment sampling finds sediment contamination.  It is likely from upland sources such as industries, businesses, and urban runoff.
1982 Proposed National Priorities List (NPL) listing for the Commencement Bay Nearshore/Tideflats site
1983 Ecology—EPA Cooperative Agreement  makes Ecology the lead agency for investigating the nature and extent of contamination at the Superfund site
1984 NPL listing finalized
1985 Commencement Bay Nearshore/Tideflats Remedial Investigation completed by EPA
1988 Commencement Bay Nearshore/Tideflats Feasibility Study completed by EPA
1989 Record of Decision sets forth cleanup plans such as source control and sediment cleanup
1992 Ecology and EPA agree on a source control strategy
1996 Partial delisting of clean areas (St. Paul, Blair Waterways)
2003 Ecology determines source control has been successful (see EPA newsletter)
2004 Removal of contaminated sediments from Middle Waterway by EPA
2005 Dredging of the lower 2/3 (mouth and middle) of the Hylebos Waterway completed
  City of Tacoma completes dredging and capping of the Thea Foss Waterway near the Museum of Glass and Albers Mill
2006 Removal of contaminated sediments from the upper 1/3 (head) of the Hylebos Waterway Final capping of the Thea Foss Waterway
2007 The Washington legislature funds the new Urban Waters Initiative to boost cleanup and protection efforts in Commencement Bay, as well as the Lower Duwamish Waterway and Spokane River
2011 Work on upland cleanup sites moves forward.