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10/11/2010 Attachment 1.A • Impact 4.8 -2: Development allowable under the New General Plan would not substantially increase impervious surfaces in the plan area and would not result in considerable interference with groundwater recharge. Therefore, this impact is expected to be less than significant. • Impact 4.8 -3: Development allowed by the New General Plan could take place within and near existing waterways and drainages, which could alter existing drainage patterns within the plan area. The New General Plan contains several new policies and programs designed to protect and preserve creeks, drainages and waterways, the implementation of which is expected to reduce this potential impact to a less- than - significant level. • Impact 4.8 -4: Existing deficiencies in capacity in the storm water drainage system could result in flooding (the overflow of storm drains) within the plan area. Increases in impervious surfaces associated with development allowed by the New General Plan could have the potential to increase storm water runoff, which could exceed the capacity of existing drainage systems and /or introduce runoff pollutants, with commensurate increases in flooding, or overflows. The New General Plan contains several policies and programs designed to alleviate potential flood impacts and restore and enhance drainages and waterways. With implementation of these policies and programs, this potential impact is expected to be less than significant. • Impact 4.8 -5: The New General Plan allows for new development within designated FEMA flood hazard areas, as well as the Emerald Lake dam inundation area, which could increase flood hazards within the plan area. As part of the City's participation in the National Flood Insurance Program, the City is required to comply with specific flood damage avoidance requirements, and several new policies and programs in the New General Plan are specifically designed and intended to reduce risks associated with flooding. Implementation of these requirements, policies and programs is expected to reduce this potential impact to a less than significant level. • Impact 4.8 -6: Due to the proximity of the plan area to the San* Francisco Bay, development allowed by the New General Plan could be located in an area of potential inundation by seismic - related seiche. Through implementation of New General Plan policies and programs intended to reduce seismic- and sieche- associated risks, adherence to the Uniform Building Code requirements, and due to the distance between developed areas in the City and the San Francisco Bay shoreline, the New General Plan is expected to have a less than significant impact related to sieche risks. ATTY /RESO /RESO.2055 /ATTACHMENT1.A 8 #15059 10/13/10 MUFF # 601