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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM FCS 99 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx March 17, 2026, requesting additional information related to the proposed project. The City provided additional information in response to their request, and the Tribe did not request any further consultation. No other responses were received pursuant to SB 18 consultation requirements. The proposed project would still require the implementation of MM CUL-2a, MM CUL-2b, and MM CUL-3 to reduce potential impacts on any previously undiscovered TCRs to a less than significant level. As such, the proposed project’s potential to cause a substantial adverse change in the significance of a Lead Agency-determined TCR would be less than significant with mitigation, consistent with the impact conclusions of the Prior FEIR. Therefore, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those previously identified in the Prior FEIR. No additional analysis is required. Zone 7 Stormwater Option The Zone 7 Stormwater Option would not result in any new or more severe impacts to cultural resources compared to those previously analyzed since it was considered in the Prior FEIR. Under this option, ground disturbance, and related potential impacts, would be incrementally reduced as compared to the City Stormwater Option because the detention basin, pump facilities, and storm drain force main would not be constructed. This option would not involve new areas of grading or excavation beyond the approved project footprint and would not affect known or unknown archaeological resources, historic resources, or TCRs. All previously adopted cultural resource avoidance and inadvertent discovery measures would continue to apply. Accordingly, impacts to cultural resources would remain less than significant and consistent with the conclusions of the Prior FEIR. Mitigation Measures MM CUL-2a Prior to the initiation of construction activities, all construction personnel directly involved with project-related ground disturbance within the residential project site and off-site improvement areas, both west and east of El Charro Road, attend a “tailgate” Worker Environmental Awareness Program (WEAP) training for archaeological resources. The training should include visual aids, a discussion of applicable laws and statutes relating to archaeological resources, types of resources that may be found within the limit of disturbance areas, and procedures to be followed in the event such resources are encountered. The training should be conducted by an Archaeologist who meets the Secretary of the Interior’s Professional Qualification Standards for archaeology. FirstCarbon Solutions (FCS) recommends that a qualified Archaeologist who meets the Secretary of Interior’s Professional Qualification Standards for Archaeology be present to monitor during the clearing and grubbing phases of ground disturbance within the limit of disturbance areas east of El Charro Road to check for the inadvertent exposure of cultural materials. In the event exposed soils indicate cultural materials may be present, this may be followed by regular or periodic archaeological monitoring as determined by the Archaeologist, but full-time archaeological monitoring is not recommended at this time.