The 30-acre landfill closed in the mid-1960s with soil cover. An active gas collection and treatment system was installed in the mid-1990s. Groundwater and landfill gas monitoring are in place. In 1999, KC Solid Waste partnered with the City of Kirkland to construct ballfields on the closed landfill.

Project goals

• Evaluate potential to reduce greenhouse gas emissions by replacing activated carbon treatment with a bio-filter phytotechnology;
• Reduce low levels of contaminants in the groundwater;
• Conclude improvements and provide property for additional 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

$0.1m 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