Event Title

Spatial and temporal differences and congener content in bulk air deposition of PCBs in the Green/Duwamish River Basin

Presentation Abstract

PCBs are a major contaminant of concern in the Lower Duwamish Waterway Superfund Site. King County wants to understand the relative contributions of atmospheric deposition to the Lower Duwamish Waterway. Thus, King County conducted a bulk air deposition study in 2011/2012 and a second study in 2013 to examine how PCB deposition varied with land use. Seven stations were passively sampled along a gradient of development from the Lower Duwamish River Valley to Enumclaw for metals, PAHs, PCBs and dioxin/furans; however, this presentation will focus on the PCB results. Samples were collected intermittently over approximately a year period for the first study and over nine months for the second study. Samples were analyzed for 209 PCB congeners. When possible, sampling stations were selected at Puget Sound Clean Air Agency monitoring stations. Stations during the first study included two in the Lower Duwamish River Valley (Duwamish and South Park), one at Beacon Hill, two in Kent and one in Enumclaw. Stations in the second study included three in the Lower Duwamish Valley (Duwamish, South Park and Georgetown) and one at Beacon Hill. These stations varied with different mixes of land use (industrial, commercial, residential) and development (urban, suburban and rural). Daily deposition rates were calculated for each sample and compared between stations and over different time periods. Multivariate analysis was used to test for significance of environmental factors in affecting deposition rates. Differences in the relative contributions of different PCB congeners to the total were also examined among stations. Results from the first study showed total PCB deposition was higher at the Lower Duwamish River Valley stations than the others. The results from 2013 will be compared with those of the first study.

Session Title

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

Conference Track

Toxics

Conference Name

Salish Sea Ecosystem Conference (2014 : Seattle, Wash.)

Document Type

Event

Start Date

30-4-2014 10:30 AM

End Date

30-4-2014 12:00 PM

Location

Room 608-609

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type

Text

Language

English

Format

application/pdf

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

Spatial and temporal differences and congener content in bulk air deposition of PCBs in the Green/Duwamish River Basin

Room 608-609

PCBs are a major contaminant of concern in the Lower Duwamish Waterway Superfund Site. King County wants to understand the relative contributions of atmospheric deposition to the Lower Duwamish Waterway. Thus, King County conducted a bulk air deposition study in 2011/2012 and a second study in 2013 to examine how PCB deposition varied with land use. Seven stations were passively sampled along a gradient of development from the Lower Duwamish River Valley to Enumclaw for metals, PAHs, PCBs and dioxin/furans; however, this presentation will focus on the PCB results. Samples were collected intermittently over approximately a year period for the first study and over nine months for the second study. Samples were analyzed for 209 PCB congeners. When possible, sampling stations were selected at Puget Sound Clean Air Agency monitoring stations. Stations during the first study included two in the Lower Duwamish River Valley (Duwamish and South Park), one at Beacon Hill, two in Kent and one in Enumclaw. Stations in the second study included three in the Lower Duwamish Valley (Duwamish, South Park and Georgetown) and one at Beacon Hill. These stations varied with different mixes of land use (industrial, commercial, residential) and development (urban, suburban and rural). Daily deposition rates were calculated for each sample and compared between stations and over different time periods. Multivariate analysis was used to test for significance of environmental factors in affecting deposition rates. Differences in the relative contributions of different PCB congeners to the total were also examined among stations. Results from the first study showed total PCB deposition was higher at the Lower Duwamish River Valley stations than the others. The results from 2013 will be compared with those of the first study.