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City of Santa Ana Environmental Checklist Zone Map for the Newport Beach Quadrangle, the project site is not located within or adjacent to an earthquake-induced landslide area. The project site is located in a generally flat developed urban area that does not contain large slopes, and development of the project would not generate large slopes on the project site. As a result, implementation of the proposed project would not expose people or structures to substantial adverse effects involving landslides, Impacts are considered less than significant. b. Result insubstantial soil erosion or the loss of topsoil? Less-than-Significant Impact. Construction of the proposed project would include ground surface disruption of the project site that could result in soil erosion. Construction activities would expose areas of soil to wind and water erosion. During a storm event, exposed soils could he transported off the site as runoff. Because the project would disturb over one acre of land, the proposed project is subject to the SWRCB General Construction Permit. Compliance with the General Construction Permit requires the development and implementation of a Storm Water Pollution Prevention Plan (SWPPP). The SWPPP requires identification of sources of sediment and a list of BMPs to provide sediment and erosion 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 grassy swales and landscaping proposed for the project site. All of the site-specific regulations and BMPs will he 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 grassy swales, landscaping and ongoing maintenance and monitoring of construction and subsequent post- construction phase BMPs, would ensue 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 Impact with Mitigation Incorporated. As described in response VI.a3, the project site is located within an area identified as susceptible to liquefaction, and potential differential settlements due to liquefaction are about 1.55 and 1.0 inches, respectively. Subsidence usually occurs as a result of excessive groundwater pumping or oil extraction. The proposed project is not in the vicinity of these activities, and would not require groundwater pumping or oil extraction. Thus, impacts related to subsidence would not occur from implementation of the proposed projects. 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 and not adjacent to a water body. Accordingly, the potential for lateral spreading is The Bat Nha Buddhist Meditation Center 3-36 June 2013 Initial Study/Mitigated Negative Declaration ICF 00215.12 31 C-89