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SANTA ANA CLIMATE ACTION PLAN INITIAL STUDY CITY OF SANTA ANA Less than Significant Impact. There is a remote possibility that ground- disturbing activities that would occur as a result of implementing transportation and land use measures as set forth in the Draft CAP could uncover previously unknown human remains. In the unlikely event that this occurs, compliance with State regulations pertaining to discovery of human remains would ensure a less than significant impact. 3.6 GEOLOGY AND SOILS a) Expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death involving: i) Rupture of a known earthquake fault, as delineated on the most recent Alquist -Priolo Earthquake Fault Zoning map, issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. Less than Significant Impact. The City of Santa Ana is not located within an Alquist- Priolo Earthquake Fault Zone as illustrated on the maps issued by the State Geologist for the area.22 The City of Santa Ana is located in a seismically active area, as is most of southern California. The Newport - Inglewood -Rose Canyon fault is located approximately eight miles southwest of the City.23 However, no active faults are located within City boundaries. Impacts would be less than significant. ii) Strong seismic ground shaking? Less than Significant Impact. The City of Santa Ana is located in a seismically active area, as is most of southern California. As stated above, the Newport- Inglewood -Rose Canyon fault is located approximately eight miles southwest of the City. Any development that occurs as a result of the Draft CAP measures would adhere to seismic standards in the latest version of the California Building Code (CBC). The City has adopted the 2013 CBC under the City's Municipal Code. Therefore, impacts to seismic ground shaking would be less than significant. iii) Seismic - related ground failure, including liquefaction? Less than Significant Impact. Liquefaction occurs when water saturated sediments are subjected to extended periods of shaking. Pressure increases in the soil pores temporarily alter the soil state from solid to liquid. Liquefied sediments lose strength, in turn causing the failure of adjacent infrastructure, including bridges and buildings. Whether a soil would resist liquefaction depends on a number of factors, including grain size, compaction and cementation, saturation and drainage, characteristics of the vibration, and the occurrence of past liquefaction. Granular, unconsolidated, saturated sediments are the most likely to liquefy, while dry, dense or cohesive soils tend to resist liquefaction. Liquefaction is 22 California Department of Conservation. Search for Regulatory Maps by County. Website: http, / /ww ,gtiakc ca.gov/2inal2s/WHZreplatoiTinql)s.htin, accessed September 3, 2015. 23 City of Santa Ana Planning Division. GO of Santa Ana General Plan Seismic Safely Element p. 9. Adopted September 20, 1982. Available online at: http:// wwcv .ci,santa- ana.ca.us /genefalplan /documents /Seise icSafety,pdf, accessed August 31, 2015. Page 30 75B -128 October 2015