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Geologic, Seismic and Soil Hazards
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There are no known active faults within the City of San Clemente; however, ground shaking resulting from regional seismic activity can have a significant local impact. Additionally, some areas where the water table is shallow with loose, unconsolidated sandy soils have the potential for liquefaction [consultant to define “liquefaction” in glossary] during a seismic event. Also, our coastal and canyon bluffs and hillsides can be steep and subject to landslides and slope failures. Potential geologic and soil hazards can be increased by inappropriate development, seismic activity and heavy rains. This section’s goal and policies, and the related implementation measures, seek to mitigate potential threats from geologic, seismic and soil hazards through information sharing and establishing appropriate development standards.
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Goal:
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Minimize risk to life, property, economic and social dislocation and disruption of vital services that could result from geologic and seismic hazards.
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Policies:
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| S-1.1. |
We collect and maintain relevant data on fault locations, soils reports and other information that can help identify seismic or liquefaction potential and areas at risk of landslides. |
| S-1.2. |
We implement mandatory development restrictions and investigation requirements pursuant to the Alquist-Priolo Act if active or potentially active faults are identified to help mitigate impacts of seismic hazards. |
| S-1.3. |
We require the retrofitting of unreinforced masonry buildings during remodels to minimize damage in the event of seismic or geologic hazards. |
| S-1.4. |
We prohibit development on unstable terrain, excessive slopes and other areas deemed hazardous due to landslide risk unless mitigation measures can assure public safety. |
| S-1.5. |
We locate development so as to avoid landslides and other geological and soils hazards, to the maximum extent possible. Where development is subject to geological or soils hazards, we require that projects be designed to mitigate such hazards. |
| S-1.6. |
Where appropriate we require new development to assess the potential for liquefaction, slop instability and landslides, and require that appropriate measures be incorporated into the project to mitigate such hazards. |
| S-1.7. |
We encourage with property owners and agencies to ensure that existing buildings housing critical public facilities such as schools, hospitals and emergency services are seismically strengthened to meet applicable building codes. |
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