The 20-acre landfill closed in the mid-1960s with a soil cover. An active gas collection and air-sparging treatment system using carbon filtration treatment was installed. In 2014, the carbon filtration was removed and replaced with dispersion venting. An engineered tree cover system was subsequently installed to enhance the cover performance. Groundwater and landfill gas treatment and monitoring are in place.

Project goals

• Evaluate efficiencies of the landfill gas control system;
• Determine whether additional groundwater treatment is needed to ensure continued decrease in groundwater impacts;
• Conclude improvements and provide property for secondary beneficial use.

Key environmental attributes

• Groundwater quality improvements to meet regulatory compliance that are protective of human health and the environment, through improvements to the environmental control systems;
• Reduce the potency of GHG emissions to the greatest extent feasible, through the collection and treatment of landfill gases;
• Achieving the above goals in order to minimize or terminate post-closure activities.

Project info

Green Bonds: 2017-Series A

$0.3m Green Bond Proceeds spent

In progress GHG emissions MTCO2e/yr

In progress water quality metrics

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CICERO rates King County Green Bonds Deep Green, their best rating.

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Related information

• Recycling & transfer stations, drop box facilities

Related agencies

• Dept. of Natural Resources and Parks
• Solid Waste Division