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Hacienda Mixed Use Rezoning Initial Study Discussion of Checklist Items Less than- Significant Impact. The zoning change itself would not remove any trees. At the time a development plan is proposed for the project sites, the impacts to any existing trees and their potential significance, if any, will be considered in the project- specific environmental review. It is anticipated that any future impacts regarding tree removal would be less than significant due to mitigation requirements of the Pleasanton Municipal Code, Chapter 17.16: Tree Preservation. No Impact. The proposed project would have no impact: on any special status species, riparian habitat, or migratory bird species. In addition, it would not conflict with an adopted Habitat Conservation Plan, Natural Community Conservation Plan or other approved local, regional, or state habitat conservation plan, as no such plans apply to the project sites. Less Than Potentially Significant with Less Than No Significant Mitigation Significant Impact Impact Incorporation Impact 5. Cultural Resources Would the project: a) Cause a substantial adverse change in the significance of a X historical resource as defined in 515064.5? b) Cause a substantial adverse change in the significance of X an archaeological resource pursuant to 515064.5? c) Directly or indirectly destroy a unique paleontological X resource or site or unique geologic feature? d) Disturb any human remains, including those interred X outside of formal cemeteries? Environmental Setting Hacienda is located in an area of relatively high archaeological sensitivity. A portion of the former Willow Marsh, which once housed aboriginal populations, was located in the western and southern portions of Hacienda. Over the millennia, the edges of this marsh and the arroyos that fed it from the east moved back and forth across the area. Given that Hacienda is located within a region of historical and archaeological significance, the potential for finds exists within the area.' The project sites contain no historic structures. Hacienda demolished all extant buildings during development of the business park. Significance Criteria The impact questions above constitute the significance criteria for this environmental topic. The text below further explains and defines the significance criteria for impact question b). CEQA Guidelines Section 15064.5(c) applies to effects on archaeological sites. Effects on non unique archaeological resources are not considered significant. Regarding unique archaeological resources, lead agencies may require that reasonable efforts be made to allow such resources to be preserved in place or left in an undisturbed state. To the extent that unique archaeological resources are not preserved in place or Left undisturbed, Public Resources Code Section 21083.2 requires mitigation measures to protect C of Pleasanton, Hacienda Business Park Planned Unit Development, PUD- 81 -30, Final Environmental Impact Report, May 1982. Draft, Subject to Revision 12 8/31/2009