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City of Pleasanton—Hidden Canyon Residences and Preserve Cultural Resources and Tribal Cultural Resources Draft EIR 3.4-2 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-04 Cultural-Tribal Cultural Resources.docx of Regulations [CCR] § 4852). It is notable that the fact that a resource is not yet identified as a historical resource or found eligible for the CRHR does not preclude a lead agency from determining that said resource is a historical resource pursuant to Public Resources Code Sections 5020.1(j) or 5024.1. Under the California Environmental Quality Act (CEQA ), a substantial adverse change in the significance of a historical resource would constitute a significant effect on the environment. Overall Cultural Resources Setting Following is a brief overview of the relevant prehistory, ethnography, and historic background, providing context in which to understand the background and relevance of sites found in the general project vicinity. This section is not intended to be a comprehensive review of the current resources available; rather, it serves as a general overview. Unless otherwise stated, information contained in this section is drawn directly from the 2018 Archaeological Resources Assessment Report prepared by Basin Research Associates. Further details can be found in ethnographic studies, mission records, and major published sources in the Archaeological Resources Assessment Report.1 Environmental Setting The San Francisco Bayshore and its variety of resources are located about 12 miles west of the proposed project, over present-day Walpert Ridge. A notable 1874 willow marsh/1867 lagoon, also mapped as Tulare Lake or the Lagoon/Willows later drained by a number of canals was located about two miles southeast of the proposed project, generally northwest of historic Pleasanton and east of I-680. The project is located at the northern end of the Pleasanton Ridge with elevations ranging from 480 to 600 feet. A number of creeks are within the vicinity. Dublin Canyon Road shadows Dublin Creek along the northern boundary of the proposed project, while the southern periphery of the project parallels Devaney Canyon. The canyon and its intermittent creek run in a southwest to northeast direction across the property. Another unnamed forested canyon branches from Devaney Canyon on the west side of the property (Pleasanton Planning Commission [P/PC]2014 [Aerial 4–Lester and Shriner Sites]). Kuchler maps the project vicinity as within mixed hardwood forest (#23). Soils in the project are classified as Clear Lake clay; Diablo clay; Los Gatos- Los Osos complex; Los Gatos loam part; and Millsholm silt loam. Native American Background-Pre-contact Native American occupation and use of the general area appears to extend over 5,000-7,000 years and may be longer. Springs and water courses and associated lakes and marshes were often a focus of prehistoric occupation in central California with Native American groups using a variety of ecological resources associated with flowing water, seasonal water sources and standing water. The available archaeological information for the Bay Area suggests an increase in the prehistoric population over time with an increasing focus on permanent settlements with large populations in 1 Basin Research Associates. 2018. Archaeological Resources Assessment Report-11021 and 11033 Dublin Canyon Road, Lester Project, Pleasanton, Unincorporated Alameda County City of Pleasanton Development Project P15-0027.