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Bicycle and Pedestrian Plan Initial Study <br /> Less Than <br /> Significant <br /> Potentia lly Impact IVith Less Than <br /> Significant Mitigation Significant No <br /> Issues Impact Incorporated Impact Impact <br /> 8. Hydrology and Water Quality Would the project:: <br /> a) Violate any water quality standards or waste discharge x <br /> requirements? <br /> b) Substantially deplete groundwater supplies or interfere [1 X <br /> substantially with groundwater recharge such that there <br /> would be a nct deficit in aquifer volume or a lowering of <br /> the local groundwater table level (e.g., the production rate <br /> of pre- existing nearby wells would drop to a level which <br /> would not support existing land uses or planned uses for <br /> which permits have been granted)? <br /> c) Substantially alter the existing drainage pattern of the site X I I <br /> or area, including through the alteration of the course of <br /> a stream or river, in a manner which would result in <br /> substantial erosion or siltation on- or off -site? <br /> d) Substantially alter the existing drainage pattern of the site I X <br /> or area, including through the alteration of the course of <br /> a stream or river, or substantially increase the rate or <br /> amount of surface runoff in a manner which would result <br /> in flooding on- or off site? <br /> e) Create or contribute runoff water which would exceed LJ x <br /> the capacity of existing or planned stormwater drainage <br /> systems or provide substantial additional sources of <br /> polluted runoff? <br /> f) Otherwise substantially degrade water quality? LJ I I I I x <br /> g) Place housing within a 100 -year flood hazard area as I I I I X <br /> mapped on a federal Flood Hazard Boundary or Flood <br /> Insurance Rate Map or other flood hazard delineation <br /> map? <br /> h) Place within a 100 -year flood hazard area structures n I I I I X <br /> which would impede or redirect flood flows? <br /> i) Expose people or structures to a significant risk of loss, I I I X I 1 I <br /> injury or death involving flooding, including flooding as a <br /> result of the failure of a levee or dam? <br /> j) Inundation by seiche, tsunami, or mudflow? I 1 I 1 X <br /> Environmental Setting <br /> Portions of Pleasanton are located within a 100 -year flood zone or a 500 -year flood zone, and within the <br /> Del Valle Dam Inundation Area as shown on Figures 5 -7 and 5 -8, respectively, of the Public Safety <br /> Element of the Pleasanton General Plan. <br /> Revised 9/4/09 21 9/4/2009 <br />