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 known and could not have been known at the time of the adoption of the Approved Project that would require the preparation of a subsequent EIR. c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off -site landslide, lateral spreading, subsidence, liquefaction, or collapse. Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. As under the Approved Project, the Proposed Project is not located on sensitive or unstable soil. As with the Approved Project, the Proposed Project would comply with Mitigation Measure G-1 and a less than significant impact would occur. There are no substantial changes in the circumstances, or new information that was not known and could not have been known at the time of the adoption of the Approved Project that would require the preparation of a subsequent EIR. d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (2013), creating direct or indirect substantial risks to life or property? Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. The Certified EIR determined that the soils on site have low expansivity potential. The Proposed Project does not include any additional building square footage and therefore would not require additional grading or earthwork. Pursuant to Mitigation Measure G-2, prior to acquiring a grading permit for construction, the developer would be required to prepare a Final Geology and Soils report to specially assess shrink -swell potential of potentially expansive soils on site and incorporate the recommendations outlined in the report. The Proposed Project would comply with identified mitigation measures. There are no substantial changes in the circumstances or new information that was not known and could not have been known at the time of the adoption of the Approved Project that would require the preparation of a subsequent EIR. e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? No Impact. As under the Approved Project, implementation of the Proposed Project would not involve the construction or use of septic tanks or other alternative wastewater disposal system. No impact would occur, and no changes or new information would require preparation of a subsequent EIR. f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? No Impact. The Proposed Project would not increase building area nor require additional earthwork activities. The Proposed Project would occur within the Approved Project's building envelope. Therefore, the Proposed Project would not directly or indirectly destroy paleontological resources or site or unique geologic feature. There are no substantial changes in the circumstances, or new information that was not known and could not have been known at the time of the adoption of the Approved Project that would require the preparation of a subsequent EIR. Page 48 PlaceWorks