Planning Commission meeting agenda packet 7-9-25

City of Pleasanton—Vineyard Avenue Residential Project 15183 Consistency Checklist Consistency Checklist 117 Update FEIR, and the proposed project would not result in any effects that would require further CEQA review for this topic. c) Drainage Leading to Erosion/Siltation, Flooding, Additional Sources of Polluted Runoff, or Impedance of Flood Flows Would the project: 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: • result in substantial erosion or siltation on- or off-site; • substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off-site; or • create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff. Summary of Housing Element Update FEIR The Housing Element Update FEIR indicated that future development consistent with the Housing Element Update would involve construction activities such as stockpiling, grading, excavation, paving, and other earth- disturbing activities. Loose and disturbed soils are more prone to erosion and loss of topsoil by wind and water. This could result in an increase in stormwater runoff and the potential to cause erosion or sedimentation in drainage swales and creeks. The Housing Element Update FEIR concluded that compliance with the NPDES and SWPPP requirements and the policies and actions included in the General Plan would ensure impacts related to erosion and siltation would be less than significant. The Housing Element Update FEIR indicated that future development consistent with the Housing Element Update could increase the total impervious area within the City and increase stormwater runoff, which could result in flooding. The Housing Element Update FEIR concluded that compliance with existing regulations, the policies and actions included in the General Plan, and adherence to the Municipal Code would maximize infiltration and rainwater retention, which would in turn reduce stormwater runoff. Additionally, all future development consistent with the Housing Element Update would be evaluated on a project-by-project basis to ensure that there are no significant impacts related to surface runoff and flooding. Further, new