Abandoned landfills are designated in Seattle Municipal Code Section 25.09.020.E. These areas are regulated to prevent damage from methane gas buildup, subsidence, and earthquake induced ground shaking. Additional soil engineering studies, methane barriers, and other construction or ventilation measures may be required in these areas to ensure that structures are designed to accommodate existing conditions.
- Seattle Municipal Code 25.09 Regulations for Environmentally Critical Areas
- 25.09.220 Development standards for abandoned landfills.
- CAM 327A, Environmentally Critical Areas Exemptions, Relief from Prohibition on Steep Slope Development, and Modifications to Submittal Requirements — Application Instructions and Submittal Requirements
- CAM 327B, Environmentally Critical Areas — Small Project Waivers Application Instructions and Submittal Requirements
- CAM 328, ECA Exceptions