Planning Commission Agenda Packet 09092026

City of Pleasanton—Additional Housing Sites Rezonings Project Addendum CEQA Guidelines Section 15164 Addendum 100 Proposed Project Analysis and Conclusion None of the proposed sites are in tsunami or seiche zones.11 Two of the three proposed sites are located within the FEMA 500-year flood hazard zone.12 Future development on the proposed sites would be required to align with applicable General Plan and Municipal Code requirements related to flood protection. Municipal Code Section 17.08.040 provides methods and provisions that control filling, grading, dredging, and other development activities that may increase flood risk. Future site development would be required to prepare a stormwater management plan in accordance with Municipal Code Section 19.14.140, which requires new developments to incorporate LID features such as bioretention. The stormwater management system would be designed with project site conditions, such as flood hazard zones, taken into account. Further, because the proposed sites are hardscaped, future projects would likely improve the stormwater conditions through compliance with the most up-to-date stormwater system standards. Therefore, impacts would remain less than significant, and the proposed project would not result in a new or more severe adverse impact that was not previously identified and disclosed in the Prior FEIR. No further analysis is required. e) Water Quality Control or Sustainable Groundwater Management Plans Consistency Would the project: Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? Summary of Prior FEIR As previously discussed, water supplies for the City are managed by Zone 7. According to the Prior FEIR, Zone 7 has adopted a Water Supply Reliability Policy to maintain the ability to meet 100 percent of Zone 7’s estimate for treated water demands for 100 percent of the time; as such, and given compliance with applicable General Plan policies and the voluntary and mandatory water conservation requirements during water shortages established in Chapter 9.30 of the City’s Municipal Code, the Prior FEIR 11 California Department of Conservation, California Geological Survey (CGS). 2026. Tsunami Hazard Area Map. Website: https://maps.conservation.ca.gov/cgs/informationwarehouse/ts_evacuation/#data_s=id%3AdataSource_3- 1918f9f263a-layer-15%3A1. Accessed March 13, 2026. 12 Federal Emergency Management Agency (FEMA). 2026. National Flood Hazard Layer. Website: https://hazards- fema.maps.arcgis.com/apps/webappviewer/index.html?id=8b0adb51996444d4879338b5529aa9cd&extent=- 121.88523674609374,37.64807200561917,-121.8582859099121,37.66505976307913. Accessed March 13, 2026.