Admiralty Inlet Marine Sediments Data Summaries, Findings, Publications

Admiralty Inlet

The following table contains links to data summaries. Shaded boxes indicate summaries not yet available.

Year Sampled Station Locations Physical Chemical Toxicity Benthic Invertebrates Sediment Quality Triad Indicators
2002-2003 * * * * * *
2014            
2024            

* Available upon request.

 

The Admiralty Inlet Sediment Quality Triad Index (PDF) offers a one-page summary of these findings.

Puget Sound Marine Sediment Indicators is a webpage that describes the Sediment Quality Triad Index, a method to rate the health of marine sediments.

 

Findings - 1997-2003

All our studies assess sediment quality by evaluating chemistry, toxicity, and benthic (sediment-dwelling) invertebrate community structure. Results are compared with those from similar surveys, conducted with the same methods, to determine changes in sediment quality.

  • No chemicals were measured above Washington State Sediment Quality Standards in the region.
  • Two sites had moderate toxicity in the sea urchin fertilization test of porewater.
  • Two sites, both near Port Townsend, had adversely affected benthic invertebrate communities.

Results are rolled up into the Sediment Quality Triad Index, which categorizes sediment quality on a 5-level scale from unimpacted to clearly impacted.  The triad index combines information on measures of exposure (sediment contamination), response (toxicity), and biological effects (benthic invertebrates). 

  • The majority (96%) of the sediments measured in Admiralty Inlet were of unimpacted or likely unimpacted quality.
  • No sediments were of clearly impacted quality in the region.

Publications

Long, E., S. Aasen, M. Dutch, K. Welch, and V. Partridge. 2008. Sediment Quality Assessment of the Bays and Inlets of the San Juan Islands, eastern Strait of Juan de Fuca, and Admiralty Inlet, 2002-2003. Washington State Department of Ecology Publication 08-03-030. 142 pp + appendices.
Long, E., S. Aasen, M. Dutch, K. Welch, and V. Partridge. 2008. Sediment Quality in the Bays and Inlets of the San Juan Islands, Eastern Strait of Juan de Fuca, and Admiralty Inlet (2002-2003). Washington State Department of Ecology Publication 08-03-031. 4 pp.

Quality Assurance Project Plan

Dutch, M., V. Partridge, S. Weakland, K. Welch, and E. Long. 2009. Quality Assurance Project Plan: The Puget Sound Assessment and Monitoring Program Sediment Monitoring Component. Washington State Department of Ecology Publication 09-03-121. 98 pp.