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Lamar County Multi- Jurisdictional Hazard Mitigation Plan <br />Chapter Three <br />7. Secondary Hazards <br />Depending on the use of the pipeline, contamination of soils and groundwater could occur should <br />buried pipelines become damaged by expansive soils. <br />8. Overall Summary of Vulnerability and Impacts <br />Changes in soil volume present a hazard primarily to structures built on top of expansive soils. <br />Damages occur as clay moisture content expands or shrinks the soil volume causing different parts <br />of the structure to move at different rates and distances. Houses and one -story commercial buildings <br />are more apt to be damaged since they are usually not heavy enough to counter swelling pressures. <br />However, multi -story buildings may be damaged by clay shrinkage when moisture levels are <br />substantially reduced. <br />The local economy can feel the impacts if the expansive soils cause mass foundation issues within a <br />community or jurisdictions. These issues can lower the values of homes which would reduce tax <br />flow to the local governments and education systems. The issues could also discourage the settling of <br />new resident and even businesses in the area. <br />There are no records of specific incidences of loss within the County due to expansive soils. For <br />large areas of the U.S., little information is reported other than field observations of the physical <br />characteristics of clay. As a result, fixed criteria for determining the swelling potential have not been <br />devised. <br />Table 8: Summary <br />City of Paris <br />Potential Severity of <br />Minor <br />ent <br />Likely <br />Medium <br />City of Blossom <br />Minor <br />Likely <br />Medium <br />City of Deport <br />Minor <br />Likely <br />Medium <br />City of Reno <br />Minor <br />Likely <br />Medium <br />City of Roxton <br />Minor <br />Likely <br />Medium <br />Lamar County <br />Minor <br />Likely <br />Medium <br />142 <br />