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City of Pleasanton—Additional Housing Sites Rezonings Project <br />Addendum CEQA Guidelines Section 15164 Addendum <br /> <br /> <br />96 <br />a, c) Surface and Groundwater Quality, Drainage <br />Would the project: a) Violate any water quality standards or waste discharge <br />requirements or otherwise substantially degrade surface or <br />ground water quality? <br />c) Substantially alter the existing drainage pattern of the site or <br />area, including through the alteration of the course of a stream <br />or river or through the addition of impervious surfaces, in a <br />manner which would: <br />(i) result in substantial erosion or siltation on- or off-site; <br />(ii) substantially increase the rate or amount of surface runoff <br />in a manner which would result in flooding on- or off-site; <br />(iii) create or contribute runoff water which would exceed <br />the capacity of existing or planned stormwater drainage <br />systems or provide substantial additional sources of <br />polluted runoff; or <br />(iv) impede or redirect flood flows? <br />Summary of Prior FEIR <br />Surface and Groundwater Quality <br />The Prior FEIR indicated that development within the City could involve <br />grading, excavation, and soil disturbance during construction, which has the <br />potential to generate runoff containing sediment and other pollutants that <br />could degrade surface and groundwater quality if not properly controlled. In <br />addition, future development could increase impervious surfaces, resulting in <br />incremental increases in stormwater runoff and associated urban pollutants. <br />The Prior FEIR concluded that required compliance with the Municipal NPDES <br />permit requirements and adherence to General Plan policies and actions <br />would render any potential construction and operational impacts to water <br />quality less than significant. <br />Drainage Leading to Erosion/Siltation, Flooding, Additional Sources of Polluted Runoff, or <br />Impedance of Flood Flows <br />According to the Prior FEIR, during the life of any development project <br />allowed under the General Plan, the increase in impervious surfaces could <br />result in a change in drainage patterns that could increase the rate and/or <br />volume of stormwater runoff, contributing to on-site or off-site flooding. <br />However, the Prior FEIR concluded that with implementation of General Plan