Item 18 - Appeal Application Nos. 2023-02 and 2023-03 for Cabrillo Town Center project

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Further, all new development would also be subject to regional and local regulations pertaining to construction activities. Specifically, development that is greater than 5 acres would be required to comply with the provisions of the General Construction Activity Stormwater Permit adopted by the State Water Resources Control Board (SWRCB), which would require the employment of Best Management Practices (BMPs) to limit the extent of eroded materials from a construction site. All development that is between 1 and 5 acres would be required to comply with the provisions of the NPDES Phase II regulations concerning the discharge of eroded materials and pollutants from construction sites. Compliance with the CBC and the NPDES permits would minimize effects from erosion and ensure consistency with the Regional Water Quality Control Board (RWQCB) Water Quality Control Plan. In view of these regulations, it was determined that implementation of the Overlay Zone will have a less than significant impact associated with soil erosion or topsoil. No mitigation is required. Geologic Unit/Soil Stability The Certified EIR stated that the project site and surrounding area are relatively flat, making the possibility for landslides extremely remote. Consequently, there is no potential for landslides to occur on or near the Overlay Zone site as a result of the proposed development. The Overlay Zone would have no impact associated with exposing people or structures to landslides, and no impacts would occur. Using unsuitable soils would have the potential to create future lateral spreading, subsidence, or collapse problems leading to building settlement and/or utility line disruption. When weak soils are re -engineered specifically for stability prior to use, these potential effects can be reduced or eliminated. An acceptable degree of soil stability would be achieved for expansive, liquefaction - prone, and compressible soils by the incorporation of soil treatment programs (replacement, grouting, compaction, drainage control, etc.) in the excavation and construction plans to address site -specific soil conditions. A site -specific evaluation of ions is required by Mitigation Measure MM-OZ 4.5-1 and must contain recommendations for ground preparation and earthwork specific to the site, that become an integral part of the construction design. As part of the construction permitting process, future developers in the Overlay Zone would be required to prepare geotechnical reports to identify potentially unsuitable soil conditions including liquefaction, subsidence, and collapse. The evaluations must be conducted by registered soil professionals, and measures to eliminate inappropriate soil conditions must be applied, depending on the soil conditions. Adherence to Mitigation Measure MM-OZ 4.5-1 as well as specified design provisions in the CBC would ensure the maximum practicable protection available for users of buildings and infrastructure and associated trenches, slopes, and foundations. This impact was determined to be less than significant. Cabrillo Town Center City of Santa Ana Technical Memorandum August 2023 City Council 18 — 535 10/3/2023