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Hacienda TOD Standards and Design Guidelines Initial Study Less Than Potentially Significant with Less Than No Significant Mitigation Significant Impact Impact Incorporation Impact 9. Hydrology and Water Quality — Would the project: a) Violate any water quality standards or waste discharge X requirements? b) Substantially deplete groundwater supplies or interfere X substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of pre- existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? c) Substantially alter the existing drainage pattern of the site X or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off -site? d) Substantially alter the existing drair age pattern of the site X or arca, including through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off -site? e) Create or contribute runoff water which would exceed the X capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff? f) Otherwise substantially degrade wa:er quality? X g) Place housing within a 100 -rear flood hazard area as X mapped on a federal Plood Hazard BoundatT or Flood Insurance Rate Map or other flood h; zard delineation map? h) Place within a 100 -year flood hazat d area structures which X would impede or redirect flood flows' i) Expose people or stnumres to a significant risk of loss, X injury or death involving flooding, including flooding as a result of the failure of a levee or damp j) Inundation by seiche, tsunami, or rnudflow? X Environmental Setting All three project sites are currently located in a 500-year flood zone and are within the Del Valle Dam Inundation Area as shown on Figures 5 -7 and 5 -8, respectively, of the Public Safety Element of the proposed Pleasanton General Plan. Significance Criteria The impact questions above constitute the significance standard for this environmental topic. Discussion of Checklist Items Less - than - Significant Impacts. The proposed zone change would not cause any hydrology or water quality impacts. Draft, Subject to Revision 22 2/1i/2011