Lower Duwamish Waterway
Source Control Investigation
Spokane Street to Kellogg Island
The Spokane Street to Kellogg Island source control area is located along the
western side of the Lower Duwamish Waterway (LDW) Superfund Site between RM 0.0
and 1.0 as measured from the southern end of Harbor Island.
Properties and facilities located adjacent to the LDW that could affect
sediments at RM 0.0-1.0 West include the Riverside Mill LLC property and it
tenants; Port of Seattle Terminal 103 and its tenants; Port of Seattle Terminal
105; General Recycling of Washington, and the former Seaboard Lumber Property, which
includes the Evergreen Trails facility and Herring’s House Park.
There are 14 upland properties in the SW Dakota Street storm drain basin that
could potentially affect RM 0.0 to 1.0 West. There are 13 properties or
facilities within the SW Idaho Street storm drain basin that could potentially
affect RM 0.0 to 1.0 West.
Facilities in the Duwamish West CSO basin that could represent potential
sediment recontamination sources are included in this report. Ecology has
assigned Facility/Site identification numbers to 143 facilities within the
Duwamish West CSO basin.
Sediments in the Spokane Street to Kellogg Island portion of the LDW have
been impacted by chemical contaminants from various sources. Before reaching the
LDW sediments the contaminants first affected upland media including surface
water, groundwater, soil, and air.
The following chemicals are considered to be contaminants of concern in the
Spokane Street to Kellogg Island source control area because they could possibly
recontaminate Lower Duwamish Waterway sediments once it has been cleaned up.
||Polychlorinated biphenyls (PCBs)
||Other semi-volatile organic
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.
Potential sources of sediment recontamination associated with the Spokane Street
to Kellogg Island source control area include SDs, CSO outfalls, and discharges
from adjacent and upland properties. Transport pathways that could contribute to
the recontamination of sediments associated with the Spokane Street to Kellogg
Island source control area following remedial activities include direct
discharges via outfalls, surface runoff (sheet flow) from adjacent properties,
bank erosion, groundwater discharges, air deposition, and spills directly to the
Source Control Action Plan
Ecology has developed a
Source Control Action Plan for
the Spokane Street to Kellogg Island source control area. This plan
describes the source control actions that are necessary to reduce the potential
for sediment recontamination. As part of the Source Control Action Plan, Ecology
hired a contractor to put together a
Summary of Existing Information and Data