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EXHIBIT A redevelopment within the City, such as the Project, shall be undertaken in accordance with the County Drainage Area Management Plan (DAMP). The DAMP requires construction sites to implement control practices that address erosion and sedimentation (DAMP Section 8.0). Additionally, the Statewide National Pollutant Discharge Elimination System (NPDES) Permit for General Construction Activity requires implementation of a Storm Water Pollution Prevention Plan (SWPPP), by a Qualified SWPPP Developer. The SWPPP is required to be consistent with the County DAMP, address site-specific conditions related to sources of sediment, and implement erosion control and sediment control Best Management Practices to reduce or eliminate sediment during construction. The Project is required to adhere to a City approved SWPPP, which would be verified prior to the issuance of a demolition or grading permit; this will ensure that potential erosion associated with construction activities would constitute a less than significant impact. (Initial Study, pp. 31-32.) 9.6.3 Soil Stability Threshold: Would the Project be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the Project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? Finding: Less than significant impact. (DEIR, p. 2-6; Initial Study, p. 32.) Facts in Support of Finding: The Project site does not contain unstable soils or unstable geologic units. As discussed above, the Project site is located in a flat, developed urban area that does not contain, and is not adjacent to, large slopes; moreover, the Project would not generate large slopes. Accordingly, impacts related to landslides would not occur as a result of the Project. Also, as discussed above, the depth to groundwater and the types of soils onsite result in a low potential for liquefaction and related lateral spreading or ground failure. In addition, as further discussed above, the Project would be required to have building foundations and pavement areas and must be constructed in compliance with the CBC and the City's Municipal Code, which requires appropriate back fill, compaction of soils, and foundation design to ensure stable soils. For the aforementioned reasons, the Project would result in a less than significant impact related to unstable soil or geologic units. In addition, the Project is not located on a geological unit or soil that would become unstable as a result of subsidence. Subsidence is a general lowering of the ground surface over a large area that is generally attributed to lowering of the groundwater levels within a groundwater basin. Subsidence or settlement of the ground can occur as a result of earthquake motion in an area where groundwater in a basin is lowered. Because the Project does not involve groundwater pumping, impacts related to subsidence will not occur as a result of the Project. (Initial Study, p. 32.) 9.6.4 Soil Expansion Threshold: Would the Project be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial risks to life or property? Finding: Less than significant impact. (DEIR, p. 2-6; Initial Study, pp. 32-33.) Facts in Support of Finding: The Project would not be located on expansive soil. Expansive soils contain certain types of clay minerals that shrink or swell as the moisture content changes. As described above, the Project site soils consist of silty fine to medium sands with local layers of fine to coarse sands with gravel size rock and some larger rock fragments, which have a low expansion potential. (Initial Study, p. Resolution No. Certification of the Magnolia at the Park EIR 75E-67 Page 29 of 71