Stormwater Treatment System for PCB in Seattle

The Boeing Company signed an agreement with EPA to construct a new stormwater treatment system at North Boeing Field in Seattle. The treatment system will be designed to reduce the amount of polychlorinated biphenyls (PCBs), which are an on-going source of pollution to the Duwamish River.

The North Boeing Field storm drain system carries stormwater to the Duwamish River through more than seven miles of catch basins, drains, inlets, and oil-water separators. Studies by the Washington State Department of Ecology (Ecology), the City of Seattle, and Boeing showed the North Boeing Field storm drain system is the biggest source of PCBs to the river sediments in Slip 4, one of the most highly contaminated sites on the lower Duwamish waterway.

With the installation of this stormwater treatment system to address the on-going source of PCBs, cleanup of Slip 4 will proceed in 2011. Several acres of contaminated sediments in Slip 4 will be cleaned up under an EPA settlement agreement with the City of Seattle and King County.

Caltha LLP provides expert consulting services to public and private sector clients nationwide to address Stormwater Permitting & Regulatory Support, Stormwater Pollution Prevention Plans (SWPPP), Stormwater Monitoring and Stormwater Training.

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