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but is not analyzed in-depth. Other manmade hazards that could occur in San Leandro, such as ground water contamination, are not included in this plan, but may be addressed by other City programs in ongoing regulatory processes, such as activities of the Environmental Protection Division. Hazards Not Considered in the Plan Other natural hazards that are rare in San Leandro are not included in this plan; these include severe storms, which can produce prolonged low temperatures, heavy rainfall and hail; severe heat; high winds; and small tornados and waterspouts. This plan does not focus on these hazards because they are not as likely to occur as the hazards addressed in detail. San Leandro’s geographic location and moderate climate shelters it from prolonged storms and extremes of cold and heat. Ocean temperatures moderate the power of tropical storms, lessening the effects of low barometric pressure and storm surge. Naturally-occurring communicable disease outbreaks (e.g. a flu pandemic; SARS) do pose a significant risk to the San Leandro community, but are not addressed in this plan. Mitigation activities for communicable disease are not yet well-defined, but they could include, for example, measures to assure a high baseline level of immunization in the community, both for routine childhood immunizations and for annual seasonal flu vaccination. The City of San Leandro continues to work closely with the Alameda County Public Health Department on establishing best practice protocols and training for City staff and public outreach training for the public. 2.5 Components of the Hazards Analysis The analysis of hazards in this plan has the following components: • Historical Events: Within recent history the city has experienced the effects of all hazards addressed in this plan. Descriptions of the impacts of these disasters help illustrate some of the types of damage they can cause. • Hazard: Describes the ways that each hazard can damage the community, and maps the locations in San Leandro that are particularly prone to specific hazards, such as the “100-year” floodplain. Areas that could experience secondary hazards, such as liquefaction following earthquakes, are also discussed. • Exposure and Vulnerability: This plan identifies the people, buildings and infrastructure that exist in hazard zones. Vulnerability refers to the susceptibility to physical injury, harm, damage, or economic loss of the exposed people, buildings and infrastructure. City elements exposed to each hazard are listed and mapped, and their vulnerability is discussed.