Liquefaction-prone areas are areas typically underlain by cohesionless soils of low density, usually in association with a shallow groundwater table, that lose substantial strength during earthquakes. Liquefaction-prone areas are specifically defined in Seattle Municipal code section 25.09.020 A. Additional soil engineering studies and mitigation measures may be required in these areas to ensure that structures are designed to accommodate liquefaction.
- Seattle Municipal Code 25.09 Regulations for Environmentally Critical Areas
- 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
Related Director's Rules