Puget Sound Marine Sediment Baseline
Surface sediments from 381 stations were surveyed throughout the greater Puget Sound/southern Salish Sea area between 1997 and 2003. Data were summarized using Ecology's Sediment Quality Triad Index for a Sound-wide baseline characterization of the spatial extent, or area, of sediment quality on a 5-level scale from unimpacted to clearly impacted.
Relative to many other estuaries and marine bays along the U.S. coastline, Puget Sound sediments were ranked among the least contaminated and toxic.
The entire Puget Sound sediment sampling frame is being resampled, region by region, between 2004 and 2014. Sound-wide sediment quality data generated during this period will be compared to the original (1997-2003) baseline data to determine changes in sediment quality over time. An update of the sound-wide Sediment Quality Triad Index calculations will be posted in 2015.
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