Terminal 117 Clean-Up

Project Summary

This significant and complex environmental project for the Port of Seattle was located along the west bank of the Lower Duwamish Waterway in South Park. It removed upland soil and river sediment to reduce hazardous material and contaminants to levels that would protect the river environment and reduce health risks to people in the area.

Major scopes of work included:

  • Excavation and disposal of approximately 60,000 tons of contaminated upland soils and approximately 25,000 tons of contaminated riverbed soils
  • Installation of 500 lineal feet of permanent sheet pile
  • Import of approximately 35,000 tons of clean import material
  • Demolition of three large warehouse buildings
  • Work involving high concentrations of PCBs (polychlorinated biphenyls), dioxin/furans, and other contaminants along a sensitive body of water in central Seattle
  • Dredging, disposal, and upland and dredge backfilling



Seattle, WA


Port of Seattle

Contract Amount

$10.5 Million


Crete Consulting, Inc.


May 2013 - February 2014

Project Highlights

This was a joint cleanup effort between the City of Seattle and the Port of Seattle. IMCO worked with various environmental agencies, including the EPA, on a daily basis, to ensure all local and federal regulations were being upheld. Stringent safety and decontamination processes were required on site.