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Council presses for clearer landslide and seismic mapping after consultant flags higher exposure
Summary
Council members raised questions about updated landslide risk figures and asked the consultant to clarify sources and whether geotechnical studies would be triggered for new development or ADUs in hillside areas.
Consultant Jeff Bradley told the joint body the draft updates maps for regional faults, landslide hazards and liquefaction risk and said the element adds guidance for geotechnical studies and updated mapping so property owners know what hazards may affect them. "We want to make sure we have the most updated landslide hazards on maps," Bradley said, noting the report proposes geotechnical requirements in hillside areas.
Several council members asked for source documentation after reading a change in the report that increased the share of Monte Sereno properties exposed to landslide damage from 75% in the 2008 report to 90% in the current draft. Members requested clarity on whether geotechnical investigations would apply to ADUs or only to major new buildings, and asked staff to identify where requirements are already mandated by state codes versus local policy choices.
