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<br /> <br />2021 Multijurisdictional Local Hazard Mitigation Plan <br /> <br />locations on steep slopes. Roads accessing timberlands are often susceptible to slides and frequently are <br />contributing factors to landslides. Mass movement activity on these roads can remove them from production. <br /> <br />Cultural Resources <br />Landslides can destroy cultural resources such as artifacts and structures. <br /> <br />Scenic Resources <br />San Mateo County features a broad range of scenic resources, including the coastline and Pacific Ocean, <br />mountains, hills, ridgelines, inland water features, forests, agricultural featur es, and distinctive rural communities. <br />Many of these resources or access routes to them are vulnerable to landslides. <br /> <br />12.4.5 Landslide Management <br />Landslides can create immediate, critical threats to public safety. Engineering solutions to protect structures on or <br />adjacent to large active landslides are often extremely or prohibitively expensive. Effective landslide management <br />should include the following elements: <br /> Continuing investigation to identify natural landslides, understand their mechanics, assess their risk to <br />public health and welfare, and understand their role in ecological systems <br /> Regulation of development in or near existing landslides or areas of natural instability through the San <br />Mateo County Code and city ordinances. <br /> Preparation for emergency response to landslides to facilitate rapid, coordinated action among San Mateo <br />County, local cities, and state and federal agencies, and to provide emergency assistance to affected or at- <br />risk community members. <br /> Evaluation of options including landslide stabilization or structure relocation where landslides are <br />identified that threaten critical public structures or infrastructure <br /> <br />12.5 FUTURE TRENDS IN DEVELOPMENT <br />Land use controls (such as prohibiting development on unstable soils or steep slopes) are the most cost-effective <br />way to prevent loss of life and property. The County and its planning partners are equipped to handle future <br />growth within landslide hazard areas. All municipal planning partners have general plans that address landslide <br />risk areas in their safety elements. All partners have committed to linking their general plans to this hazard <br />mitigation plan update. This will create an opportunity for wise land use decisions as future growth impacts <br />landslide hazard areas. <br /> <br />The California Building Standards Code has adopted the International Building Code (IBC) by reference. The <br />IBC includes provisions for geotechnical analyses in steep slope areas that have soil types considered susceptible <br />to landslide hazards. These provisions assure that new construction is built to standards that reduce the <br />vulnerability to landslide risk. Building construction and grading activities are subject to County code that require <br />a geotechnical report or slope stability analysis under specific slope conditions. The County requires a site <br />evaluation prior to building plan check. Geologic maps are reviewed during the site evaluation and where building <br />or grading is proposed in areas mapped with landslides, expansive soils, liquefaction potential, or fault rupture <br />hazards, a geotechnical report is required, and design mitigations identified. <br /> <br /> <br /> <br />12-12