Abstract Title

Session S-01B: PCBs in the Green/Duwamish Watershed

Keywords

Toxics

Start Date

30-4-2014 10:30 AM

End Date

30-4-2014 12:00 PM

Description

Sources of PCBs to the Lower Duwamish Waterway Superfund Site include the urban drainage basin as well as inputs from upstream portions of the Green River Watershed, which are likely a long-term source of these contaminants to the waterway. To better understand contaminants in the upper watershed, suspended solids samples were collected from four major tributaries to the Green River (Newaukum, Soos and Mill Creeks and the Black River), as well as at two locations on the main stem Green River: an upstream location at Flaming Geyser State Park and a downstream location at Foster Links Golf Course. Two collection methods were used: sediment traps and filtered solids collected by pumping water through filter bags. The sediment traps were deployed for approximately three months over a year-long period. The filtered solids were collected over a 24-hour periods during both baseflow and storm event conditions with a target of one baseflow event and five storm events. While all samples were analyzed for PCBs, polycyclic aromatic hydrocarbons, arsenic and conventional parameters, this presentation will focus on the results for PCBs, grain size and total organic carbon.

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Apr 30th, 10:30 AM Apr 30th, 12:00 PM

PCBs Associated with Suspended Solids in the Green River Basin

Room 608-609

Sources of PCBs to the Lower Duwamish Waterway Superfund Site include the urban drainage basin as well as inputs from upstream portions of the Green River Watershed, which are likely a long-term source of these contaminants to the waterway. To better understand contaminants in the upper watershed, suspended solids samples were collected from four major tributaries to the Green River (Newaukum, Soos and Mill Creeks and the Black River), as well as at two locations on the main stem Green River: an upstream location at Flaming Geyser State Park and a downstream location at Foster Links Golf Course. Two collection methods were used: sediment traps and filtered solids collected by pumping water through filter bags. The sediment traps were deployed for approximately three months over a year-long period. The filtered solids were collected over a 24-hour periods during both baseflow and storm event conditions with a target of one baseflow event and five storm events. While all samples were analyzed for PCBs, polycyclic aromatic hydrocarbons, arsenic and conventional parameters, this presentation will focus on the results for PCBs, grain size and total organic carbon.