Cedar Hills Landfill

Maple Valley, WA

NWC contracted with King County on this fast-paced project that involved various improvements to the Cedar Hills Landfill. Work included installation of a new soil and geosynthetic liner system, High Density Polyethylene gas collection/conveyance piping, storm water piping, and refuse excavation. NWC also performed upgrades to the landfill’s existing truck wash; consisting of replacing two vertical turbine pumps, slide gate installation, electrical improvements, and installation of a sodium hypochlorite treatment system. Additionally, NWC constructed access ports and other upgrades to the leachate force main.

NWC’s tasks at this site have included the Area 6 Stage 4 Closure, Truck Wash Modifications, Leachate Force Main Upgrade, Area 6 Stage 3 Closure, and Area 7 Phase 2 Development.

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