Lower Duwamish Waterway
Source Control Investigation
Early Action Area 2: River Mile 2.2
Early Action Area 2 was identified as an area requiring sediment cleanup
based on work conducted for the Lower Duwamish Waterway (LDW) Superfund
site. This area is located on the western bank of the Lower Duwamish
Waterway, just south of the First Avenue S. bridge in King County,
Washington (see map). Early Action Area 2 consists of a small inlet,
approximately 80 feet wide at its mouth and tapering to a narrow stream at
Based on the results of sediment sampling conducted between 1991 and
2005, the following chemicals are potential contaminants of concern:
Ecology is the lead for source control for the LDW Superfund site. Source
control is the process of finding and then stopping or reducing releases of
pollution to the river. The routes for contaminants to enter Early Action Area 2
sediments include direct discharges via piped outfalls, bank erosion from
adjacent properties, surface runoff from adjacent properties, groundwater
discharge, air deposition, and spills directly to the inlet.
Ecology identified potential sources in the Early Action Area 2 drainage basin
that could recontaminate sediments to develop a
Source Control Action Plan. The Plan describes the source control
actions that are necessary to prevent sediment recontamination.
Ecology hired a contractor to research potential sources of contamination in
Early Action Area 2 and prepare
Summary of Existing
Information and Data Gaps Reports.
Ecology performed sampling to address some of the data gaps identified in the
Summary of Existing Information Data Gaps report. In 2007, site
characterization activities were conducted at the Trotsky Property (Industrial
Container Services –WA, LLC), and in 2008
at the Douglas Management Company Property. Investigation activities
included sampling and analysis of subsurface soil, groundwater, seep water, stormwater outfall sediment and water, and intertidal sediment.
Sampling results are available in the
Summary of Additional Site Characterization
Activities: Trotsky and Douglas Management Company Properties.
Cleanup Sites in Early Action Area 2