Houghton Landfill – Landfill Gas Control Improvements
King County Green Bonds
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.
- 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.
Green Bonds: 2017-Series A
$0.1m Green Bond Proceeds spent
In progress GHG emissions MTCO2e/yr
In progress water quality metrics