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Environmental Impacts of the Proposed Changes to the Original Project Addendum to the City of Pleasanton Downtown Specific Plan Final Environmental Impact Report 31 would not result in a substantial adverse change in the significance of a historical resource. Additionally, because the single-family residence does not qualify as a historic resource, development adjacent to the residence would not result in a substantial adverse change in the significance of a historical resource by altering its setting. Impacts would be less than significant, similar to those discussed in the Final EIR for the DSP as a whole. Archaeological Resources The following analysis incorporates information from the Archaeological Resources Assessment (ARA) prepared for the proposed project by Rincon Consultants, Inc., in October 2023. The ARA is included as Appendix C. The ARA included a records search of the Northwest Information Center (NWIC) at Sonoma State University, and of the NRHP, CRHR, the California Historical Landmarks list, the Built Environment Resources Directory, and the Archaeological Determination of Eligibility list. Background and archival research undertaken as part of the ARA included a review of historical aerial photographs and topographic maps, geologic maps, soils maps, and previously conducted archaeological resource evaluation. The complete results of these searches are discussed in Appendix C. The ARA also included a pedestrian survey of the project site. Exposed ground surfaces were examined for artifacts, ecofacts, soil discoloration that might indicate the presence of a cultural midden, soil depressions, and features indicative of the former presence of structures or buildings (e.g., standing exterior walls, postholes, foundations) or historical debris (e.g., metal, glass, ceramics). The records search identified 10 previously conducted cultural resources studies within a 0.5 mile radius of the project, two of which are the studies of the restaurant building and single-family residence within the project site performed by TreanorHL and documented in the HRE (Appendix B). No other previously conducted studies overlap with the project site, and none of these surveys identified archaeological resources (Appendix C). The geologic maps review identified that the project site has high sensitivity for buried archaeological resources due to underlying soil types and proximity to Arroyo del Valle. The field survey did not identify archaeological resources (Appendix C). The ARA did not identify archaeological resources or archaeological deposits in the project site. However, the lack of surface evidence of archaeological materials does not preclude their subsurface existence. Due to the project site’s geologic setting and its proximity to Arroyo Valle, there is a high potential for buried archaeological deposits to be extant within the project site. Construction of the project could result in a substantial adverse change in the significance of an archaeological resource, which would be significant impact. Pleasanton’s General Plan includes Program 5.2, which requires new development to “follow the recommendations contained within archaeological and historical architecture studies regarding rehabilitation or preservation of archaeologically or historically significant structures and sites” (City of Pleasanton 2005).The ARA includes recommendations that would involve implementation of a worker environmental awareness program, archaeological monitoring during construction, and archaeological resource recovery protocol if resources are encountered during construction. Accordingly, the project would involve implementation of the recommendations within the ARA as conditions of approval, and the project would not result in a substantial adverse change in the significance of an archaeological resource with compliance with General Plan Program 5.2 and the recommendations made in the ARA. Impacts to archaeological resources would not be greater than those anticipated in the Final EIR. The recommended conditions of approval to implement Program 5.2 are as follows: