2020-065 - Adopting Environmental Findings of Fact

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The Warner Redhill Mixed -Use Project CEQA Findings of Fact CBC, as included as PPP GEO-1, would reduce hazards from seismic -related ground failure, including liquefaction and settlement to a less than significant level. Plans, Program and Policies: PPP GEO-1: CBC Compliance. As listed previously. Impact Finding: The Project would not expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death involving landslides (Draft EIR at p. 5.5- 9). Facts in Support of Findings: The Project site ranges from approximately 57 to 65 feet msl and that the site is not located within a mapped area considered potentially susceptible to seismically induced slope instability. In addition, the Project site is not adjacent to any hills or slopes that could be subject to a landslide. Thus, the Project site is not located within or adjacent to an earthquake -induced landslide area, and the Project would not expose people or structures to substantial adverse effects involving landslides, and impacts related to landslides would not occur. Impact Finding: The Project would not result in substantial soil erosion or the loss of topsoil (Draft EIR at p. 5.5-9). Facts in Support of Findings: The City's Municipal Code Chapter 18-156, Control of Urban Runoff implements the requirements of the Orange County Municipal NDPES Storm Water Permit (Order No. R8-2016-0001). All projects in the City are required to conform to the permit requirements, which includes installation of Best Management Practices (BMPs) in compliance with the NPDES permit, which establishes minimum stormwater management requirements and controls that are required to be implemented for the proposed Project. To reduce the potential for soil erosion and the loss of topsoil, a Stormwater Pollution Prevention Plan (SWPPP) is required by the Regional Water Quality Control Board (RWQCB) regulations to be developed by a QSD (Qualified SWPPP Developer). The SWPPP is required to address site -specific conditions related to specific grading and construction activities. The SWPPP is required to identify potential sources of erosion and sedimentation loss of topsoil during construction, identify erosion control BMPs to reduce or eliminate the erosion and loss of topsoil, such as use of silt fencing, fiber rolls, or gravel bags, stabilized construction entrance/exit, hydroseeding. With compliance with the City's Municipal Code, RWQCB requirements, and the BMPs in the SWPPP that is required to be prepared to implement the Project, construction impacts related to erosion and loss of topsoil would be less than significant. In addition, the proposed Project includes installation of landscaping, such that during operation of the Project substantial areas of loose topsoil that could erode would not exist. Also, the onsite drainage features that would be installed by the Project have been designed to slow, filter, and slowly discharge stormwater into the offsite drainage system, which would also reduce the potential for stormwater to erode topsoil during Project operations. Furthermore, implementation of the Project requires City approval of a site specific Water Quality Management Plan (WQMP), which would ensure that the City's Municipal Code, RWQCB requirements, and appropriate operational BMPs would be implemented to minimize or eliminate the potential for soil erosion or loss of topsoil to occur. As a result, potential impacts related to substantial soil erosion or loss of topsoil would be less than significant. City of Santa Ana 14 May 2020