6 - GPA19-01; AA19-01_651 W SUNFLOWER AVENUE

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Legacy Sunflower Apartments Page 51 Mitigated Negative Declaration – March 14, 2019 substantial evidence of a known fault? (Refer to Division of Mines and Geology Special Publication 42.) Less Than Significant Impact. A geotechnical report was prepared for the project.15 A copy of the geotechnical report is attached in Appendix B. The site, like the majority of southern California, is located in a seismically active area. The San Joaquin Hills fault zone is located approximately 2 miles to the west and the closest known fault to the site. Ground shaking may occur along other active faults in the region. The closest known surface expression of active faulting to the site is the Newport-Inglewood fault that is located approximately six miles southwest of the site. The likelihood of surface fault rupture at the site during the life of the project is low.16 The project is not located in a State of California Earthquake Fault Zone.17 While there are faults in the region that could generate moderate to significant ground shaking at the site, the incorporation of the recommendations in the geotechnical report regarding design and the construction of the apartment building, parking structure and other site improvements would reduce potential fault impacts to less than significant. ii. Strong seismic ground shaking? Less Than Significant Impact. Because the project site is located in southern California and a seismically active area, there is the potential for ground motion at the site. The geotechnical report that was prepared for the project identifies measures to protect the project from strong seismic ground shaking. As with all projects in Santa Ana, the design and construction of all proposed site improvement must comply with the current California Building Code (CBC). Project compliance with the CBC and the incorporation of all measures recommended in the geotechnical report to reduce seismic hazards as deemed applicable by the City Engineer would reduce potential strong ground shaking impacts to the project to less than significant. iii. Seismic-related ground failure, including liquefaction? Less Than Significant Impact. The project site is located in a state designated Zone of Required Investigation for Liquefaction.18 Based on the geotechnical report and the liquefaction analysis conducted for the site, the sandy soil 25 feet below ground surface is susceptible to liquefaction during major earthquake layers below approximately 25 feet below ground surface. Therefore, the project would be impacted by liquefaction. The geotechnical report recommends measures for incorporation into the design and construction of the project to reduce liquefaction impacts. The City Engineer would, based on the recommendations in the geotechnical report recommend measures for incorporation into the design and construction of the project to reduce liquefaction impacts. The incorporation of recommended mitigation measures by the City Engineer to protect the project from liquefaction would reduce potential liquefaction impacts to less than significant. iv. Landslides? No Impact. The project site and the area adjacent to and immediately surrounding the site is basically flat. There are no hills or other topographic relief features either on or adjacent to the site that would impact the project due to a landslide. The project site is not located within an area that is designated by the State of California as a Zone of Required Investigation for Earthquake-Induced Landslides.19 The project would not be exposed to or impacted by a landslide. 15 Geotechnical Engineering Evaluation Report, Sunflower Apartments, 651 Sunflower Avenue, Santa Ana, California, Twining, April 30, 2018. 16 Ibid, page 3. 17 Ibid 18 Ibid, page 5. 19 Geotechnical Engineering Evaluation Report, Sunflower Apartments, 651 Sunflower Avenue, Santa Ana, California, Twining, April 30, 2018, page 6. 6-73