PH15 Filling Critical Data Gaps in Ecological Risk Assessment
Exhibit Hall
8:00 AM - Thursday

(PH182) Year 3 - Status update for the Lower Duwamish Waterway Superfund Site.

Godtfredsen, K1, Deshler, T1, Johns, D1, 1 Windward Environmental, Seattle, WA, USA

ABSTRACT- The Lower Duwamish Waterway (LDW) was added to the National Priorities List (also known as Superfund) on September 13, 2001. The first phase of a two-phase remedial investigation has been completed, and the work plan for the second phase has been approved. As part of the Phase 1 remedial investigation, scoping-level ecological and human health risk assessments were conducted using existing site data. The results of these assessments made it possible to identify sites for early actions and specific data to be collected via fieldwork and analyses as part of the baseline risk assessments to be conducted in Phase 2. These data needs include bathymetric, porewater chemistry, seep chemistry, and additional surface and subsurface sediment chemistry data; additional tissue chemistry data for four fish species, benthic invertebrates, clams, crabs, and gastropods; site use information for spotted sandpiper, rockfish, gastropods, clams, crabs, shrimp, and humans; additional data to characterize background exposures of arsenic (total and inorganic); and additional data regarding sediment stability within the LDW. Results of the Phase 1 risk assessments, Phase 2 approaches (including a residual risk assessment approach to assess risks remaining after early actions), and the status of ongoing field work are described.

Key words: data needs, risk assessment, Superfund, sediment

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