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3.1.2 Impacts <br /> The primary project related impacts associated with geology, seismicity, and soils <br /> would include topographic alteration, erosion, slope stability, and degradation of <br /> agricultural soils. <br /> Topographic Alteration <br /> Development of the quarry area would result in a lowering of the ground <br /> elevation in this area by approximately 12 feet. This could impact drainage and <br /> percolation of runoff on the project site. These impacts are discussed in more detail in <br /> the section 3.2 (Hydrology and Water Quality). <br /> Erosion <br /> Development of the quarry area and access road could expose soils in the project <br /> area to erosion by water and wind. The access road and active portion of the quarry <br /> area would be watered for dust control; however, areas that are being excavated would <br /> not be revegetated until that portion of the excavation (up to 5.5 acres) is complete. <br /> Bare soils would be exposed to water and wind erosion during this period (approximately <br /> 6 months). This would be considered a potentially significant impact. <br /> Slope Stability <br /> No significant indications of natural slope failure were identified during the site <br /> visits and the potential for natural slope failure is probably low. However, project <br /> construction and reclamation could impact slope stability. Additionally, seismic activity <br /> could further aggravate slope stability problems. <br /> Temporary cut slopes constructed during excavation of the quarry could be <br /> unstable, depending on the competency of the materials excavated and the steepness of <br /> the slope. Because these are alluvial deposits, the material would be unconsolidated or <br /> poorly consolidated, and steep slopes would likely be unstable. Slope failure in the <br /> excavation area could impact worker safety. This would be considered a potentially <br /> significant impact. <br /> 24 <br />