75A - One Broadway Plaza Addendum_4.20.2020_wAppendices

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ONE BROADWAY PLAZA PROJECT EIR ADDENDUM CITY OF SANTA ANA 5. Environmental Analysis would be less than significant and no change or new information would require preparation of a subsequent EIR. 5.6.3 Adopted Mitigation Measures Applicable to the Proposed Project No mitigation measures related to energy are applicable to the Proposed Project. 5.7 GEOLOGY AND SOILS 5.7.1 Summary of Previous Environmental Analysis The Certified EIR found that the development of the Approved Project would change the topography of the site; however, this would not result in a significant impact since the change would be covered by buildings constructed on the site. The soils on the site are classified as a single soil association and are relatively uniform in composition of Mocho association, including loam, clay loam, and similar soil types. Geotechnical testing indicated that the soils have low expansivity and mostly overconsolidated. The soils on the Project Site were determined to be adequate for building and do not pose a constraint for the land uses proposed as part of the Approved Project. The Certified EIR found that the Approved Project would impact existing topography and soils at the Project Site and incorporates mitigation measures to ensure that impacts are less than significant. The Approved Project does not include septic tanks; and no further discussion was required. The Certified EIR determined that a less than significant impact would occur with regards to groundshaking, liquefaction, and surface fault rupture. The Certified EIR identifies a mitigation measure to ensure that the Approved Project would comply with the seismic design provisions of the Final Geology and Soils Report and the Uniform Building Code to promote safety in the event of an earthquake. The Initial Study analyzed landslides and determined that the Project Site and surrounding areas are relatively flat and developed. Construction of the Approved Project would create dust, which would be reduced to a less than significant level with the incorporation of a mitigation measure in place to control dust. Paleontological resources were analyzed as part of the Cultural Resources section in the Initial Study prepared for the Approved Project. The Initial Study determined that the Approved Project's impact to paleontological resources and unique geologic features would be less than significant as the Project Site is currently developed and no prior discoveries of paleontological resources have occurred. 5.7.2 Impacts Associated with the Proposed Project Would the Proposed Project: April2o2o Page 45