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Pimlico Drive Ttrrnottt med pipeline Prgjc~ct Environutenta! Checklist 5. CULTURAL RESOURCES Environmental Setting The project area was not identified as having site specific historic period archeological or Native American resources. A cultural resources records search showed no recorded occurrences of historic period archeological resources occurring within the project area, and no Native American resources in or adjacent to the proposed project area are referenced in the ethnographic literature. State and federal inventories list no historic properties within the proposed project area (Sonoma State University Northwest Information Center 2006). Based upon an evaluation of the environmental setting and features associated with known sites conducted by the Sonoma State University Northwest Information Center (2006), Native American cultural resources in this part of Alameda County have been found in valleys in close proximity to seasonal and perennial watercourses. The proposed project area is located in the Amador Valley at the valley floor level with numerous creeks in close proximity. Given the similarity of these environmental factors, there is a moderate likelihood that unrecorded Native American cultural resources exist in the proposed project area. Review of historical literature and maps also showed that three historic-period buildings occurred near the proposed project area. Therefore, there is a moderate possibility of identifying historic-period archaeological resources during construction. Standards of Significance For purposes of this environmental document, an impact is considered significant if the proposed project would: • Cause a substantial change in the significance of a historical or archeological resource as defined in the C>/QA Guidelines Section 15064.5; or, • Directly or indirectly destroy a unique paleontological resource or site or unique geologic feahfre. Less than Potentially Significant Less than Significant Wi[h Mitigation Significant No ISSUCS Impact IncorpnrateJ Impact Impact Cultural Resources Would the project a) Cause a substantial adverse change in the ^ ^ ^X ^ significance of a historical resource as defined in § 15064.5'? b) Cause a substantial adverse change in the ^ ^ ^X ^ significance of an archaeological resource pursuant to §15064.5? City of Pleasanton 25 Wmiler & Kelly Draft Initial Study/Proposed NegaOvc Dcclarahon August 2006 04263501