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(Draft SEIR, pp. 4.E-9 to 4.E-14.) 5. Cultural Resources Impact 4.E -2b Development facilitated by the proposed Zone has the potential to cause a substantial adverse change in the significance of an archaeological resource pursuant to CEQA Guidelines § 15064.5. The SEIR evaluates the impacts of the proposed Zone on archaeological resources. Some sites that would be developed may have only been minimally disturbed in the past and they may contain unknown archaeological resources, the disturbance of which could therefore cause a substantial adverse change in the significance of a unique archaeological resource pursuant to § 15064.5 of the CEQA Guidelines. Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant Finding: Changes have been incorporated into the proposed Zone that would avoid the significant environmental effect as identified in the SEIR. Mitigation Measure 4.E-5, which has been incorporated into the proposed Zone, will reduce the significant environmental impact to a less -than -significant level. Facts in Support of Finding: The following facts and mitigation measure indicate that the impact will be reduced to less than significant. 1. The proposed Zone is located in Holocene -aged alluvial deposits, a geologic formation that has a high potential for buried archaeological resources. Previous disturbance from the channelization of Alamo Creek, construction of the I-680 and I-580 freeways, and existing development throughout the area of the proposed Zone indicates that any sensitivity for buried prehistoric archaeological resources in the area has been significantly reduced; however, unknown archeological resources may be present underground within the area of the proposed Zone. 2. Implementation of Mitigation Measure 4.E-5 set forth in Table 6-1 of the Final SEIR and listed in the MMRP will ensure that Impact 4.E -2b would be reduced to a less -than -significant level and is hereby incorporated by reference and described below. Mitigation Measure 4.E-5: Archeological Resources. If prehistoric or historic - period archaeological resources are encountered during ground disturbing activities for a project under construction within the EDZ, the construction contractor shall 31