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SAN LEANDRO SHORELINE DEVELOPMENT EIR ADDENDUM PROJECT CITY OF SAN LEANDRO Page 42 PlaceWorks As discussed in the Certified EIR, the majority of the Original Project was outside of the 100-year floodplain with the exception of the area south of Pescador Point Drive, designated as Zone VE – coastal flood hazard subject to wave velocity, as well as the residential area of the project, east of Monarch Bay Drive, designated Zone AE with a base flood elevation (BFE) of 10 feet above mean sea level (msl). The Certified EIR stated that FEMA is currently revising the Flood Insurance Rate Maps (FIRMs) for all nine counties surrounding San Francisco Bay, and that the area south of Pescador Point Drive would no longer be within the 100-year floodplain, however, according to the current FEMA FIRM maps, a portion of the area south of Pescador Point Drive remains within Zone AE with a BFE of 12 feet msl. However, as described in the Project Description for the Approved Project, the residential areas would be outside of the flood zones due to increased base elevation heights. The 6 housing units under the Modified Project would be located within the Townhouse development area with the increased base elevation height, and, therefore, would not substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or offsite. As there are no streams or flood control channels within the project boundaries, construction of the project would not impede or redirect flood flows, which as described above, are primarily associated with coastal flooding associated with wave velocity. Therefore, the Modified Project would not result in a new impact or a substantial increase in the magnitude of existing impacts which would substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would affect any of the four hydrological hazards (i-iv) outlined in the table. HYDRO-d According to the Certified EIR, since the project site is in a flat, coastal area, there is no potential for impacts due to mudflows. Since the Certified EIR was prepared, the CEQA significance criteria has been revised to replace the mudflow with release of pollutants due to project inundation. Because the base elevation of all sections of the project site where development is planned will be outside of areas subject to flooding due to sea level rise, inundation would not occur. As with the Original Project, the risk of flooding remains very low within the City of San Leandro, however, the Modified Project remains within the tsunami inundation zone, as mapped by ABAG. Therefore, the standards, precautions, and warning systems for the Original Project would also apply for the Modified Project. The Original Project found a less than significant impact from seiches because there are no large bodies of water within San Leandro, and the long distances of shallow water in San Francisco Bay would minimize waves generated by a seiche. Because the Modified Project site is within the same project area, the finding remains valid. Therefore, the Modified Project would not result in a new impact or a substantial increase in magnitude of the existing impacts to flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation. HYDRO-e The Modified Project would be in compliance with the San Francisco Bay Regional Water Quality Control Board (RWQCB) Water Quality Control Plan for San Francisco Bay Basin which describes the water quality that must be maintained to support beneficial uses of the State waters, and provides programs, projects,