2024-053 - Final Supplemental for The Related Bristol Specific Plan Project

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the Draft Supplemental EIR). Thus, impacts related to lateral spreading would be less than significant. Also, impacts related to landslides would not occur. However, as detailed in the Geotechnical Report (Included as Appendix G to the Draft Supplemental EIR), groundwater has been encountered at the site at between 5 and 16 feet bgs and excavations during Project construction are likely to encounter groundwater. The Geotechnical Report identified that excavations within potentially collapsible wet soils may need to be stabilized; and stabilization may consist of placement of a granular working mat consisting of geogrid and coarse gravel or sub -excavation and replacement with dried soil. Mitigation Measure GEO-1 has been included to require that the proposed Project comply with a final design -level geotechnical report that must be completed in compliance with the current CBC requirements and prepared to the satisfaction of the City's Building and Safety Division. Also, Mitigation Measure GEO-2 is included to ensure that geotechnical recommendations regarding groundwater induced unstable soils are implemented pursuant to existing CBC construction measures. Also, the CBC, as currently adopted in the City's Municipal Code Chapter 8, Article 2, Division 1, requires that a California Certified Engineering Geologist or California -licensed civil engineer provide site -specific engineering data for the proposed structures, which are reviewed by the City for appropriate inclusion as part of the building plan check and development review process. Compliance with the requirements of the CBC and City's Municipal Code for structural safety is included as PPP GEO-1 and would reduce potential impacts to a less than significant level. Therefore, due to the need for mitigation to ensure implementation of existing CBC measures, impacts related to Project buildout of the site would be slightly greater than the impact conclusions set forth in the GPU FEIR, which determined that impacts related to unstable soils would be less than significant with implementation of existing regulations (Draft Supplemental EIR at pp. 5.4-11 through 5.4-12). Plans, Program and Policies: PPP GEO-1: CBC Compliance. The proposed Protect is required to comply with the California Building Standards Code (CBC) as included in the City's Municipal Code as Chapter 8, Article 2, Division 11 to preclude significant adverse effects associated with seismic and soils hazards. As part of CBC compliance, CBC related and geologist and/or civil engineer specifications for the proposed Project shall be incorporated into grading plans and building specifications as a condition of construction permit approval. Mitigation Measures: MM GEO.1 Incorporation of and Compliance with a Design Level Geotechnical Report. A final design level geotechnical report that complies with all applicable state and local code requirements shall be prepared for each Project structure by a California licensed qualified geotechnical engineer consistent with the California Building Code and City of Santa Ana requirements applicable at the time of grading construction and shall include recommendations related to site grading and earthwork, fill materials, compaction, foundations, and other structural elements. The report recommendations shall be included in construction specifications and permits; and confirmed through onsite inspections.