Marine nearshore sediment

This marine nearshore sediment monitoring study sampled sediments at approximately one fathom depth along the urban nearshore in Puget Sound during the summer of 2016.

The U.S. Geological Survey (USGS) is the project lead, working with assistance from Washington Department of Natural Resources (DNR), and King County Environmental Lab (KCEL).

The goal of this study is to assess chemical concentrations in the Puget Sound urban nearshore sediments.

Sampling and data analysis are completed and the final report is expected in late 2017. Recommendations from the science team for a regional urban nearshore sediment trend program will also be included in the final report.

The Stormwater Work Group (SWG) will make changes to the SAM nearshore trend monitoring program based on recommendations from the report and further discussion by SWG's technical committees.

This map shows the nearshore sediment sampling locations for the SAM program.

Site selection

Nearshore monitoring sites for SAM were drawn using EPA’s spatially-balanced probabilistic random stratified approach. The Puget Sound shoreline master list was restricted to the nearshore along 2011 urban growth areas in Puget Sound. The SAM sediment sites are the same as the SAM mussel sites, with only a couple exceptions.

Puget Sound Mussel Monitoring sample design provides more information. Each site represents a length of 800 meters along urban nearshore areas. SAM nearshore sediment monitoring occurred in Aug. 2016 at 40 urban nearshore sites at one fathom in depth. The study’s sampling Quality Assurance Progress Plan (QAPP) provides information on the sites and study design.

Other key deliverables