Planning Commission Agenda Packet 09092026

City of Pleasanton—Additional Housing Sites Rezonings Project Addendum CEQA Guidelines Section 15164 Addendum 60 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. b) Archaeological Resources Would the project: Cause a substantial adverse change in the significance of an archaeological resource pursuant to Section 15064.5? Summary of Prior FEIR The Prior FEIR found that the Planning Area contains both recorded and potentially unrecorded archaeological resources, and that archaeological sensitivity varies by landscape position. The Prior FEIR explained that much of the Planning Area likely contains unrecorded prehistoric and historic cultural resources, and that the known distribution of sites reflects the extent of prior surveys rather than the true distribution of resources. It stated that valley floor areas generally have lower prehistoric sensitivity except along drainages, while hills to the south and west, especially around springs and creeks, have relatively high sensitivity. The Prior FEIR identified prehistoric resources that may be present, including lithic scatters, campsites, villages, rock shelters, milling features, burial sites, and ethnographic resources associated with Native American use of the area. The Prior FEIR addressed both known and unknown archaeological resources through Impacts CR-1 and CR-2. For known resources, it found that existing laws and General Plan policies would reduce impacts to less than significant. For unknown resources, it found that road improvements, utility corridors, and excavation for residential or business development could damage undiscovered prehistoric, historic, or archaeological resources, particularly in areas near springs and creeks where only part of the Planning Area had been surveyed. However, the Prior FEIR noted that much of the Planning Area had already been developed or designated open space, that development would occur within the UGB, and that most new development would undergo project-specific CEQA review. It also stated that the City’s standard condition of approvals require all construction to stop if cultural materials are uncovered, with evaluation by a qualified archaeologist and implementation of appropriate mitigation pursuant to CEQA. General Plan Program 5.1 calls for using information on known archaeological finds to determine whether studies, monitoring, or other mitigation are appropriate, and Program 5.3 requires cessation of construction and grading in the vicinity of discovered artifacts until evaluation and approval of mitigation. The Prior FEIR concluded that impacts would be less than significant.