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Ostrich Bay Sediment Toxicity Evaluation

Publication number Date Published
05-03-023August 2005
VIEW NOW Ostrich Bay Sediment Toxicity Evaluation (Number of pages: 75) (Publication Size: 1MB)

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Author(s) Blakley, N.
Description Sediment in Ostrich Bay, near Bremerton, Washington, was tested for toxicity using four bioassay tests in accordance with the Washington State Sediment Management Standards. The sediment samples were also chemically analyzed. A former Naval ammunition depot discharged metals and other chemicals into the bay during operations from 1904 to 1959.

Biological regulatory criteria for sediment quality were exceeded at six of the 12 sampling stations, based on the bioassay testing. The Sediment Quality Standard for mercury was also exceeded at six stations.

The basis for the observed sediment toxicity is unknown. Elevated sulfide levels in Ostrich Bay do not appear to be a contributor. A previous attempt to identify a metal or organic contaminant responsible for the toxicity of Ostrich Bay sediments also was unsuccessful.
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Keywords samples, biological, toxicity, evaluation, chemical, sediment, standards, toxic, quality, management, sediment management standards
WATERSHED Water Resource Inventory Area 15 Kitsap
DATA Environmental Information Management (EIM) #NBLA0002


Quality Assurance Project Plan: Ostrich Bay Sediment Toxicity Evaluation