Terminal 115
River Mile 1.6 - 2.1 West

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SITE BACKGROUND

The Terminal 115 source control area, also referred to as the RM 1.6 to 2.1 West source control area, is located along the west side of the LDW between RM 1.6 and 2.1, as measured from the southern end of Harbor Island. Although identified as the Terminal 115 source control area, this source control area includes the Port-owned Terminal 115 property, parcels owned by the state of Washington and City of Seattle Department of Transportation, the Highland Way SW SD basin and portions of the SW Kenny Street SD basin, both of which discharge to the LDW between RM 1.6 and 2.1 West.

The Port owns the property adjacent to the LDW within the Terminal 115 source control area and leases it to several facilities. Terminal 115 provides marine services such as receipt and shipment of bulk cargo, repair and maintenance of cargo shipping containers, cargo warehouse activities, storage of metal and wood construction materials, and vessel outfitting, maintenance, and repair. Terminal 115 was paved in 1986.

The upland areas adjacent to the LDW have been industrialized for many decades; historical and current commercial and industrial operations in the vicinity of the Terminal 115 source control area include aircraft manufacturing, sand and gravel operations, cargo handling and shipping, and warehousing/distribution.

CONTAMINATION

Sediments in the T115 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 T115 source control area because they could possibly recontaminate Lower Duwamish Waterway sediments once it has been cleaned up.

Chemicals of concern include polycyclic aromatic hydrocarbons (PAHs), phthalates, semi-volatile organic compounds (benzyl alcohol and hexachlorobenzene), and PCBs. Dioxins and furans and organotin compounds are potential contaminants of concern.

Potential sources of sediment recontamination associated with the Terminal 115 source control area include storm drain, and Combined sewer overflows (CSOs) outfalls, and discharges from adjacent and upland properties. Transport pathways that could contribute to the recontamination of sediments associated with the Terminal 115 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 LDW.

Source Control

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 Terminal 115 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 Terminal 115 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 LDW.

Source Control Action Plan

Ecology developed a Source Control Action Plan for the T115 source control area.. This plan describes the source control actions that are necessary to prevent sediment recontamination. As part of the Source Control Action Plan, Ecology hired a contractor to put together a Summary of Existing Information and Data Gaps report.


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