Project Library

Terminal 117 Cleanup – Water Treatment

Seattle, Washington, USA

Terminal 117 Cleanup - Water Treatment

The Terminal 117 cleanup site (T-117), located on the west bank of the Lower Duwamish Waterway in the South Park neighborhood, was a joint cleanup project by the Port of Seattle and City of Seattle. This site was identified for cleanup because the upland property, river bank and sediments, and parts of the adjacent yards and streets have high concentrations of PCBs (polychlorinated biphenyls), dioxin/furans and other contaminants from the former Duwamish Manufacturing and Malarkey Asphalt Company locations.

WaterTectonics was part of the remedial clean-up action for the City of Seattle in consultation with EPA. Project leaders chose not to discharge to the Duwamish River but rather got permission to discharge to the sewer with treatment at 200gpm including media filtration, granular activated carbon, and bag filtration.