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3. Environmental Checklist San Leandro Treatment Wetland IS/MND 3-27 February 2024 Aerial photos from 1946 and 1958 show the current pond area completely underwater at that time, indicating it is now composed of highly disturbed fill sediment. a) Substantial change to historical resources. According to Section 15064.5 of the CEQA Guidelines, the lead agency is responsible for assessing a project's impact on historical resources. These resources are defined as any buildings, structures, sites, or objects that are either listed in, or deemed eligible for listing in, the California Register. They can also be considered significant by a lead agency in various fields including architecture, engineering, science, economics, agriculture, education, society, politics, or culture in the context of California's history. For the Proposed Project site, no historic resources have been identified in or around the area. Therefore, the Proposed Project is not expected to have any impact on historical resources. Impact Designation: No Impact b) Substantial change to archaeological resources. This section addresses archaeological resources, considering them both as historical resources per Section 15064.5 and as unique archaeological resources as outlined in Section 21083.2 (g). During the background research and surface survey, no unique prehistoric or historic-period archaeological resources were discovered within the Project area. Given the findings of the surface survey, the distribution of nearby sites, and the history of disturbance in the Project area, no further archaeological investigation or construction monitoring is currently deemed necessary. However, in the unlikely event that archaeological resources are discovered during the Project's implementation, the following mitigation measure would be employed to ensure that any potential impacts are reduced to a less-than-significant level. Impact Designation: Less than Significant with Mitigation Mitigation Measure CR-1: Inadvertent Discovery of Cultural Resources. Should any prehistoric or historic-period archaeological resources be discovered during construction, all activities within a 100-foot radius must immediately cease, and San Leandro should be informed. An archaeologist qualified by the Secretary of the Interior standards must inspect the site within 24 hours of the discovery. Should the findings be deemed as either a historical resource or a unique archaeological resource (as defined by the CEQA Guidelines), appropriate mitigation measures will be taken in line with PRC Section 21083.2 and Section 15126.4 of the CEQA Guidelines, favoring preservation in situ whenever possible. In accordance with Section 15126.4(b)(3), preservation in situ may be achieved through various means such as adjusting construction plans to avoid the resource, integrating the resource within a designated open space, covering the resource with a protective cap, or transferring the site into a permanent conservation easement. If avoidance is not feasible, a detailed treatment plan will be developed and implemented by a qualified archaeologist in consultation with San Leandro and any relevant Native American tribes. Treatment of unique archaeological resources will adhere to the stipulations of PRC Section 21083.2. Generally, treatment might involve selective excavation, artifact collection, thorough site documentation, and historical research, all aimed at salvaging important scientific data from the