31B - CUP - 1901 NORTH FAIRVIEW ST

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City of Santa Ana Environmental Checklist control. The SWPPP is required to meet or exceed measures required by the Construction General Permit. In addition, the proposed project is required to prepare a NPDES post - construction stormwater management plan in accordance with the Orange County Drainage Area Management Plan (DAMP) and the City of Santa Ana Local Implementation Plan (LiP). The stormwater management plan must include all applicable post - construction BMPs for this project. In addition to the implementation and maintenance of BMPs, erosion would also be controlled by the landscaping proposed for the project site. All of the site specific regulations and BMPs will be provided in a Water Quality Management Plan (WQMP) to be implemented for post - construction operations of the project. Compliance with existing state, regional, and local regulations, NPDES permit requirements, and project- specific BMPs identified in the SWPPP, coupled with installation of landscaping and ongoing maintenance and monitoring of construction and subsequent post - construction phase BMPs, would ensure that project impacts with respect to topsoil loss and erosion would be less than significant. c. 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 an on -site or off -site landslide, lateral spreading, subsidence, liquefaction, or collapse? Less - than - Significant Innpact with Mitigation Incorporated. As described in response VLO, the project site is located within an area identified as susceptible to liquefaction; however, the surface manifestation of liquefaction is deemed unlikely. Exhibit 4 of the Seismic Safety Element of the City's General Plan indicates that the project site is located within an area subject to subsidence. Subsidence usually occurs as a result of excessive groundwater pumping or oil extraction. The proposed project would not require groundwater pumping, nor would oil extraction occur as a result of the proposed project. For lateral spreading or flow failure to occur, a continuous, laterally unconstrained liquefiable zone must be free to move along gently sloping ground toward an unconfined area. The project site is relatively flat. Although the Santa Ana River channel and levee are located approximately 200 feet south and east of the project site, the river channel near the site is concrete - lined, and the depth is generally shallower than the soil layers at the project site deemed susceptible to liquefaction, and thus would have no effect related to lateral spreading on or adjacent to the project site. Accordingly, the potential for lateral spreading is deemed low (Appendix B). The proposed project would comply with all CBC requirements. Additionally, as required in Mitigation Measure GEO -1, the proposed project would comply with all geotechnicai recommendations provided in the Geotechnical Exploration Report {Appendix B) to minimize potential impacts related to soils and geology. Therefore, potential impacts related to unstable soils are less than significant with implementation of Mitigation Measure GEO -1. d. 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? Less - than - Significant Impact. Expansive soils are fine- grained soils (generally High plasticity clays) that can undergo a significant increase in volume with an increase in water content and a significant decrease in volume with a decrease in water content. Changes in the water content of an expansive soil can result in severe distress to structures constructed upon the soil. The near surface soils at the project site are generally granular with localized sandy silt to clay layers. Based on the geotechnicai exploration report prepared for the proposed project, the near surface soils have low expansion The Academy Charter High School 3 40 June 2012 Initial Study /Mitigated Negative Declaration ICE 00414.11