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 Comments: a) Directly or indirectly cause 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. No Impact. As analyzed in the Certified EIR, no active or potentially active faults cross or project into the Project Site. Fault rupture is not expected to impact the Project Site. No impact would occur, and no changes or new information would require preparation of a subsequent EIR. ii) Strong seismic ground shaking? Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. As discussed in the Certified FIR, seismic hazard from ground shaking is typical of Southern California. The Proposed Project, similar to the Approved Project, would be designed in accordance with the seismic design provisions of the Uniform Building Code to promote maximum safety in the event of an earthquake. Similar to the Approved Project, the Proposed Project would comply with Mitigation Measure G-4. Impacts would be less than significant and no changes or new information would require preparation of a subsequent EIR. iii) Seismic -related ground failure, including liquefaction? No Impact. As discussed in the Certified EIR, the Project Site is not located within a liquefaction zone (DOC 1998). Therefore, the Proposed Project would not result in any new impacts or increase the severity of impacts with respect to liquefaction compared to the Approved Project and impacts would remain less than significant. iv) Landslides? No Impact. the Project Site is not located within an earthquake -induced landside zone (DOC 1998). The Project Site is generally flat and located within an urbanized area. No impact is anticipated, and no mitigation is required. No changes or new information from the Proposed Project would require the preparation of a subsequent EIR. b) Result in substantial soil erosion or the loss of topsoil? No Impact. The Proposed Project does not increase building area nor construct additional floor area. The Proposed Project would occur within the Approved Project's building envelope. As such, the Proposed Project would not result in the soil erosion or loss of topsoil. The Proposed Project would comply with identified mitigation measures. There are no substantial changes in the circumstances, or new information that was not Apri12020 Page 47