Planning Commission meeting agenda packet 7-9-25

City of Pleasanton—Vineyard Avenue Residential Project 15183 Consistency Checklist Consistency Checklist 119 and Discharge Control, of the City’s Municipal Code. Based on the required submittal and approval of a SWPPP, the proposed project would not violate water quality standards or waste discharge requirements or otherwise substantially degrade surface or groundwater quality during construction. Following completion of project buildout, the site would be largely covered with impervious surfaces and landscaped areas, and topsoil would not be exposed. As such, the potential for on-site erosion and the associated impacts to water quality would be reduced. However, the addition of impervious surfaces would result in the generation of urban runoff during project operations, which could contain pollutants if the runoff encounters vehicle fluids on parking surfaces and/or landscape fertilizers and herbicides. The City of Pleasanton has adopted the Alameda Countywide Clean Water Program C.3 Stormwater Technical Guidance, which requires new development projects that create or alter 10,000 sf or more of impervious area to contain and treat all stormwater runoff from the project site. The proposed project would create 228,835 sf of new impervious area. Therefore, the proposed project would be subject to the C.3 stormwater standards, as well as the requirements of the SWRCB and the RWQCB included in the City’s NPDES General Permit. Compliance with such requirements would ensure that impacts to water quality standards or waste discharge requirements would not occur during operation of the proposed project. Based on the above, impacts related to substantially altering 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, siltation, or flooding on- or off-site, 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, were adequately addressed in the Housing Element 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 impede or redirect flood flows?