![]() ![]() As an additional performance evaluation of the disposal site, we have calculated volume weighted mean (VWM) chemical concentrations of dredged material taken to Commencement Bay using disposal volumes and pre-dredging chemistry results to determine how they compare to measurements at the disposal site during corresponding site monitoring events. This presentation reviews the monitoring findings at Commencement Bay within the context of the DMMP framework, and explores how the program has adapted over time. In the 29 years since the Commencement Bay disposal site was established, over 8.6 million cubic yards of dredged material has been taken to the site, and the DMMP has conducted 10 environmental monitoring studies to ensure compliance with the Clean Water Act and to verify that the disposal site was performing as designed. The DMMP developed a monitoring framework to assess the physical, chemical, and biological effects of dredged material disposal at Puget Sound non-dispersive aquatic disposal sites and their surrounding environments. The Commencement Bay non-dispersive aquatic dredged material disposal site in Tacoma, WA, was established in June 1988 by the Puget Sound Dredged Disposal Analysis (PSDDA) program (predecessor of the DMMP), under the dredged material management plan for central Puget Sound sites. Environmental Protection Agency, Region 10 (U.S. ![]() Army Corps of Engineers, Seattle District (USACE), the Washington State Department of Ecology (Ecology), and the U.S. Dredged material disposal in Puget Sound is managed by the Dredged Material Management Program (DMMP), an interagency partnership consisting of the Washington State Department of Natural Resources (DNR), the U.S. ![]()
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