NS-3092 - Zone Change for 1801 East Chestut Ave

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SANTA ANA REZONE PROJECT INITIAL STUDYIMITIGATED NEGATIVE DECLARATION sufficient height, slope ratio, and underlying geologic conditions that can result in liquefaction.) Impacts would be less than significant. • Landslide: The site is not located within a designated area where previous occurrence of landslide movement or local topographic, geological, geotechnical, and subsurface water conditions occurred. The site is flat and is not located near slopes that would be susceptible to landslides. Impacts from landslides would be less than significant. • Subsidence:According to the 2021 Recirculated PEIR, the areas of the City most susceptible to subsidence are the margins of the Santa Ana River and Santiago Creek; however, these areas are approximately 4 miles west of the project site. Further, the proposed project would not include large structures that would pose a hazard in the event of a seismic event related to unstable soils, and the proposed solar shade structures would be constructed consistent with seismic design requirements of the 2022 CBC. Impacts would be less than significant. d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property? Less than significant impact. The 2021 Recirculated PEIR notes that there is some potential for expansive soils throughout the City, especially in areas where clays and elastic silts may be present, including alluvial soils and weathered granitic and fine-grained sedimentary rocks.37 As described above, the proposed project would not include large structures that would pose a hazard in the event of a seismic event related to unstable soils and largely consists of repaving an existing parking lot. Additionally, the proposed solar shade structures would be constructed consistent with seismic design requirements of the 2022 CBC. Impacts would be less than significant. e) Have soils incapable of adequately supporting the use of septic tanks or alternative wastewater disposal systems where sewers are not available for the disposal of wastewater? No impact. The proposed project does not propose the use of septic tanks; therefore, no impacts to soils due to the use of septic systems would occur. f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? Less than significant impact. The project site is located on the Tustin Plain, which is situated on younger alluvium deposits (Qya)"comprised of a variety of unconsolidated and interbedded mud, sand, and gravel which were transported and deposited from repeated flooding of streams composed of headwaters in the Peninsular Ranges that are continuously transported gradually today and have a 37 City of Santa Ana.2021.City of Santa Ana General Plan Update.2021 Recirculated PEIR.October. 8 United States Department of the Interior Geological Survey. 1929.Geologic Map of the Northern Santa Ana Mountains, California. FCS ss Https./Jadecinnovatlons.sharepolnt.comfsiles/Puhlications511p{Shafed OotumenLsJPuhlicalionSJCI[ent(RN-JN)/03;7/03270047/ISMN0/032700a7 S-W Ana Rei P,.Qr40!s pipe No, NS-3092 Page 67 of 118