City of Irvine
2020 Local Hazard Mitigation Plan
Other Threats
Landslides Landslides may block roadways causing long-term disruptions to the roadway network, infrastructure systems, and city capabilities. Underground utility lines in slide-prone areas or above-ground lines built on or above them, can be damaged in a landslide, causing service outages. Landslides could affect sensitive ecological areas around the community, causing localized harm to the region’s ecosystem, although widespread disruptions are unlikely. Homes and businesses are typically damaged or destroyed by landslides. In addition to potentially causing significant injuries or fatalities, this can cause economic harm and create a need for long-term emergency sheltering and temporary housing until these buildings can be reconstructed. Utility lines, such as power lines or water pipes, may be broken by a landslide, interrupting important services. Subsidence If subsidence occurred in Irvine, the impacts could be widespread. In addition to potentially damaging buildings and other above-ground structures throughout the community, subsidence could damage roads and rail lines as well as underground pipes such as water, wastewater, and natural gas. This could create more congestion on Irvine’s transportation networks and interrupt key utility services.
Hazardous Materials Release
Physical Threat
Hazardous materials can cause damage to physical assets in Irvine if they are released into the environment. Corrosive hazardous materials can damage the exteriors of any buildings or structures designated as a critical facility or facility of concern by the City. Flammable hazardous materials can potentially start fires and may cause any CFs or FOC nearby to flashover. Generally, sites that are closer to the origin for the release of the hazardous materials are more at threat than those that are further away. Figure 4-7 shows the CFs and FOC in Irvine that are located within 500 feet of hazardous materials sites identified in the City. Table 4-10 shows the numbers of physical assets in Irvine that are threatened by a hazardous materials release within 500 feet of a site storing or using hazardous materials. 29 CFs composed of Vital City Operations and Bridges are located within 500 feet of a site with hazardous materials. Seven FOC exist within 500 feet of a site with hazardous materials. A total potential loss estimated for these areas is over $90 million. Table 4-11 identifies the number of facilities located within areas of increased pollution, as indicated by Cal EPA’s Cal Enviroscreen dataset. Identifying census tracts in the 50 th percentile or greater. Based on this dataset, 23 CFs and one facility of concern are located within these census tracts. Based on this analysis, approximately $41 million in potential losses could occur if a hazardous materials incident were to occur.
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