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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />2. Hazard Descriptions <br />Though no noted historical occurrences of a large-scale landslide induced epidemic <br />has been documented, there is a possibility it may occur. Unless water sources are <br />contaminated, an outbreak would be limited to responders and, potentially, those <br />with whom they come into contact. Due to this, some mitigation would be <br />necessary to prevent the spread of viral or bacterial contaminants. The risk of this <br />impact occurring is low. <br />Hazardous Materials <br />A hazardous material spill or release can occur any time there is a landslide in a <br />developed area. Commonly, spills are seen when household chemicals, fuel tanks, <br />and wastewater components are involved. Larger spills can occur when a landslide <br />damages hazardous material infrastructure such as holding tanks or power supplies. <br />More information on HazMat spills and releases is in Appendix I. <br />History of Impact in Eugene -Springfield <br />There has been no known significant landslide induced hazardous materials spills or <br />releases in the Eugene -Springfield area. <br />Risk of Impact <br />Due to historical occurrences and the number and location of hazardous materials <br />within the area, the risk of this impact occurring has been deemed to be low. <br />2.7.6 Probability of Future Occurrences <br />The probability of a landslide occurring in the Eugene -Springfield area depends <br />upon several factors, including steepness of slope, slope composition (i.e. soil type), <br />local geology, vegetative cover, human activity, and water. There is a strong <br />correlation between intensive winter rainstorms and the occurrence of rapidly <br />moving landslides. Most landslides occur during the rainy months of the year. The <br />Steering Committee rated the probability of a landslide occurrence as high. A high <br />rating means one incident is likely in a 10 to 35-year period. <br />2.7.6 Vulnerability and Capacity Assessment <br />Landslides can occur during any season in the Eugene -Springfield area. Given local <br />development patterns, residential and public land use is most likely to be impacted <br />by landslides. In Oregon, residential development is explicitly prohibited or <br />restricted in areas with steep slopes. Specifically, Chapter 197 of the Oregon <br />Revised Statute in the Oregon Administrative Rules provides for needed housing <br />"...suitable, available and necessary for residential uses." Lands "(c) [having] <br />2-49 January 2020 <br />