Lower Duwamish Waterway
Source Control Investigation
Boeing Developmental Center
River Mile 4.3-4.9 East
The Boeing Developmental
Center (BDC) source control area (also referred to as the RM 4.3-4.9 East source
control area) is located along the eastern side of the LDW Site between RM 4.3
and 4.9, as measured from the southern end of Harbor Island. The aerial
photograph shows this source control area.
Boeing Developmental Center is the only facility located within this source
This source control area is bordered to the north by the Slip 6 source control
area and to the south by the EAA-7 source control area. Portions of the
BDC property extend into these source control areas. Information on these
source control areas can be found at the following links:
The upland areas near this source control area have been heavily
industrialized for decades. Historical and current commercial and industrial
operations in the vicinity of the BDC source control area include a commercial
airport, chemical manufacturing, a military flight center, a museum, and an auto
wrecking storage yard.
Sediments in the BDC source control area have been impacted by chemical
contaminants from various sources. Before reaching the LDW sediments, the
contaminants are first impacted in upland media including surface water,
groundwater, soil, and air.
The following chemicals are considered to be contaminants of concern in the BDC
source control area because they could possibly recontaminate Lower Duwamish
Waterway sediments once it has been cleaned up.
||Polychlorinated biphenyls (PCBs)
||Polynuclear Aromatic Hydrocarbons (PAHs)
Ecology is the lead for source control for the LDW Superfund site. Source
control is the process of finding and then stopping or reducing as much as
possible releases of pollution to the river. Ecology looks at the drainage for
the BDC source control area in order to determine what source control work needs
to be done. The BDC source control area drainage basin outlines the area where
sources need to be controlled. The way contaminants enter Lower Duwamish
Waterway sediments from this source control area 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.
Source Control Action Plan
Ecology developed a Source Control Action Plan
for the BDC source control area which describes what source control actions
are necessary. As part of the Source Control Action Plan, Ecology hired a
contractor to put together a
Summary of Existing Information and Data Gaps report.