May 1, 1990August 2, 2026

Baseline Soil and Groundwater Quality Assessment: Seattle City Light Long-Term Lease Option, Seattle, Washington

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A baseline soil and groundwater quality assessment prepared by Roy F. Weston Inc. for Boeing Environmental Affairs regarding Seattle City Light’s long-term lease option on property adjoining the Duwamish Substation in Seattle, Washington. The report evaluates soil and groundwater conditions on property that received dredged sediment from the Duwamish Waterway in 1968 and 1985, analyzing for contaminants including PCBs, PAHs, and metals. The assessment was conducted to support Boeing’s evaluation of a potential 50-year lease agreement with Seattle City Light.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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