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King County brief: options after Cedar Hills landfill closes include rail export or mass-burn; public EIS scoping underway
Summary
King County Solid Waste Division presented a long-term disposal study to Kent council detailing five disposal options, narrowed to two feasible approaches (export by rail or mass burn with ash export), and announced SEPA scoping and a draft EIS in 2026.
Representatives from King County Solid Waste told Kent council members on June 17 that the Cedar Hills Regional Landfill's remaining life is expected to end around 2040 and that the county is studying long-term disposal options. The County study examined five approaches'waste export by rail, mass-burn energy recovery (with ash export), gasification/pyrolysis, refuse-derived fuel, and partial early export'and found only two options currently feasible at scale: export by rail and mass-burn with ash export.
County staff and consultants reported they modeled three…
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