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 rate or amount of surface runoff in a manner which would result in flooding on- or offsite; (iii) create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff; or (iv) impede or redirect flood flows? Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. The Proposed Project would not develop new floor area nor increase impervious surfaces. As such implementation of the Proposed Project would not alter existing drainage pattern of the site nor the project area. The Proposed Project would not alter the course of a stream or river. The Proposed Project would not create a new significant impact nor a substantial increase in the severity of previously identified effects that would require the preparation of a subsequent EIR. d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation? Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. The Initial Study for the Certified EIR determined that the Project Site is not near any large bodies of water that could generate tsunamis or seiches. The Certified EIR determined that the Project Site is outside the area that could be inundated by flood water. While the Project Site is not within a flood area, the Project Site may be exposed to street flooding during period of heavy rain due to deficient storm drains. The Certified EIR provides mitigation measures to address storm drain capacity. Since the Proposed Project would not increase the development floor area nor impervious surfaces on the Project Site, the Proposed Project would result in a less than significant impact to flood hazard and inundation. The Proposed Project would comply with the SWPPP, WQMP, and NPDES permit and implement all identified mitigation measures. A less than significant impact would occur. e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? Less Than Significant Impact/No Changes or New Information Requiring Preparation of an EIR. The Proposed Project would not construct new floor area nor increase impervious surfaces. Construction and operation of the Proposed Project would comply with the SWPPP, WQMP, and NPDES permit. Further, the Proposed Project would comply with Mitigation Measures W-1 through W-8. Therefore, the Proposed Project would not conflict with or obstruct the implementation of a water quality control plan and would not impact groundwater. A less than significant impact would occur. 5.10.3 Adopted Mitigation Measures Applicable to the Proposed Project The following mitigation measures have been carried through from the One Broadway Plaza EIR. These mitigation measures have been incorporated into MMRP for this Addendum. Any modifications to the mitigation measures from the Certified EIR are shown as for deleted text and bold for new, inserted text. W-1 Prior to issuance of a grading permit for the project: Page 64 PlaceWorks