RM 1.2-1.7 East (Saint Gobain to Glacier Northwest)

SITE BACKGROUND

The stormwater drainage basin for the River Mile (RM) 1.2-1.7 East (Saint Gobain to Glacier Northwest) source control area is located along the eastern side of the Lower Duwamish Waterway. It sits 1.2-1.7 miles from the southern end of Harbor Island.

The RM 1.2-1.7 East source control area encompasses approximately 26.73 acres of commercial and industrial properties. Within the RM 1.2-1.7 East source control area, potential sources of sediment recontamination include direct discharges from public and private storm drain systems and direct and indirect discharges from facilities adjacent to the Lower Duwamish Waterway.

The map shows the source control area which includes the following facilities: Saint-Gobain Containers, Longview Fibre Paper and Packaging, Certainteed Gypsum, Inc, Philip Services Corporation, Art Brass Plating, Blaser Die Casting, Capital Industries, Inc.

CONTAMINATION

Sediments in the RM 1.2-1.7 East portion of the LDW have been contaminated by various sources and chemicals. The contaminants first affected upland media including surface water, groundwater, soil, and air before reaching the LDW sediments.

The following chemicals are considered to be contaminants of concern with regard to potential sediment recontamination.

Metals	Organics
Mercury	Polychlorinated biphenyl (PCBs)
Zinc	Phthalates (Bis(2-ethylhexyl)phthalate)
	Volatile Organic Compounds (VOCs)
	Polycyclic aromatic hydrocarbons (PAHs)

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 releases of pollution to the river. Ecology looks at the Slip 6 drainage basin to determine what sources need to be controlled (see map). The routes for contaminants to Slip 6 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.

Source Control Action Plan

Ecology developed a Source Control Action Plan for RM 1.2-1.7 East (Saint Gobain to Glacier Northwest 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.

Related Information