South Sound Data Summaries, Findings, Publications 

The following table contains links to data summaries. (Click on X to download files. Zip files will need to be extracted into another folder. Shaded boxes indicate summaries not yet available.)

Year Sampled Station Locations Physical Chemical Toxicity Benthic Invertebrates Sediment Quality Triad
1999 * * * * * *
2011 X X X X X X
2021            

* Available upon request.

 

The South Sound 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.

Recent Findings

In June of 2011 the Washington State Department of Ecology (Ecology) surveyed 55 sites to evaluate sediment quality in South Puget Sound with the sediment quality triad of chemistry, toxicity, and benthic (sediment-dwelling) invertebrate community structure. Results were compared with those from a similar survey in 1999 to determine whether sediment quality changed.

Results include:

  • Exposure to chemical contaminants was minimal almost everywhere.
  • More than half the area in 2011 had toxic sediments, a large increase from 1999.
  • Bottom-dwelling organisms were adversely affected in about one-third of South Sound, unchanged from 1999.

Sediment Quality was evaluated with the Sediment Quality Triad Index, which combines information on measures of exposure (sediment contamination), response (toxicity), and biological effects (benthic invertebrates), and categorizes sediment quality on a 5-level scale from unimpacted to clearly impacted.

Results showed:

  • Overall sediment quality in 2011 was unimpacted for the majority of South Sound, unchanged from 1999.
  • No stations had clearly impacted sediment.
  • A few areas, mostly in Budd Inlet, had possibly or likely impacted sediment.

Publications

Partridge, P., S. Weakland, M. Dutch, E. Long, and K. Welch. 2014. Sediment Quality in South Puget Sound, Changes from 1999 to 2011 . Washington State Department of Ecology Publication 14-03-006. 8 pp.
Dutch, M., S. Weakland, V. Partridge, K. Welch, and E. Long. 2012. 2011 Sediment Quality Assessment of the South Puget Sound Region and Budd Inlet, Including Comparisons with 1999 Regional Conditions. 2012 South Sound Science Symposium, October 30, 2012, in Shelton, WA. Washington State Department of Ecology Publication 12-03-054. Poster.

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.
Dutch, M., V. Partridge, S. Weakland, K. Welch, and E. Long. 2009. 2011 Addendum to Quality Assurance Project Plan: The Puget Sound Assessment and Monitoring Program Sediment Monitoring Component. Washington State Department of Ecology Publication 09-03-121-Addendum2. 62 pp.