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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />GEOLOGY AND SOILS <br />G -3 Be located on a geologic unit or soil that is unstable, or that would become unstable as a result <br />of the project and potentially result in on- or off site landslide, lateral spreading, subsidence, <br />liquefaction, or collapse. <br />G -4 Be located on expansive soil, as defined in Table 18 -1B of the Uniform building Code (1994, <br />creating substantial risks to life or property. <br />G -5 Have soils incapable of adequately supporting the use of septic tanks or alternative waste water <br />disposal systems where sewers are not available for the disposal of waste water. <br />The Initial Study, included as Appendix A, substantiates that impacts associated with the following thresholds <br />would be less than significant: G -l.i, G -l.iv, G -2, and G -5. These impacts will not be addressed in the <br />following analysis. <br />5.4.3 Environmental Impacts <br />The following impact analysis addresses thresholds of significance for which the Initial Study disclosed <br />potentially significant impacts. The applicable thresholds are identified in brackets after the impact statement. <br />Impact 5.4 -1: Future development in accordance with the Harbor Boulevard Mixed Use Transit Corridor <br />Plan would not subject people and structures to substantial adverse hazards from ground <br />shaking. [Threshold G -1.ii] <br />ImpactAnalrus: Buildout of the Harbor Boulevard Mixed Use Transit Corridor Plan would add residents, <br />employees, and development intensity within the project area. The project area is in a seismically active <br />region; faults and historic earthquakes in the region are described above in the Geologic Hazards discussion <br />of Section 5.41, Envimnmental Setting. Therefore, project implementation could subject people and structures <br />to hazards from ground shaking. <br />However, seismic shaking is a risk throughout southern California, and the project area is not at greater risk <br />of seismic activity or impacts than other areas. Additionally, the state regulates development in California <br />through a variety of tools that reduce hazards from earthquakes and other geologic hazards. The 2010 <br />California Building Code has provisions to safeguard against major structural failures or loss of life caused by <br />earthquakes or other geologic hazards. The City of Santa Ana has adopted by reference the most recent <br />version of the CBC into its municipal code. Projects considered for approval under the Harbor Boulevard <br />Mixed Use Transit Corridor Plan would be required to adhere to the provisions of the CBC, which are <br />imposed on project developments by the City during the building plan check and development review <br />process. For example, Chapter 16 of the CBC contains requirements for design and construction of <br />structures to resist loads, including earthquake loads. Compliance with the requirements of the CBC for <br />structural safety during a seismic event would reduce hazards from strong seismic ground shaking. <br />Individual development projects that would be accommodated under the Harbor Boulevard Mixed Use <br />Transit Corridor Plan would also be required to have a geotechnical investigation conducted of the site. <br />Requirements for geotechmcal investigations are included in CBC Appendix J, Section J104. Applications for <br />Page 5.4 -10 PlaceWorkr <br />