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Grand Avenue Widening Project Environmental Impact Report Section 3.0 This review helped determine possible past levels of disturbance such as earlier sewer lines and water lines on this alignment. Assessor's Records Construction dates for those structures identified on the widening plans for Alternatives 1 and 2 as full takes were reviewed to assess if any structures that date 50 years or older or pre -1950 would be affected by the proposed project. These records are housed at the County Assessor's office in Santa Ana. 3.7.4 IMPACTS RELATED TO CULTURAL RESOURCES Impacts of Alternative 1 Related to Cultural Resources Impacts of Alternative 1 Related to Archeological Resources There are no documented archeological resources in the Grand Avenue project limits under Alternative 1. Therefore, Alternative 1 will not result in adverse impacts on any documented archeological resources. No mitigation is required. The construction of Alternative 1 could result in adverse impacts on previously unknown buried archeological resources. These impacts will be mitigated to below a level of significance based on implementation of measures CR -1 to CR -6, described later in this section. Impacts of Alternative 1 Related to Historic Resources As discussed earlier, there are no important significant historic resources as defined by the thresholds of significance within or adjacent to the project limits for Alternative 1. Therefore, Alternative 1 will not result in adverse impacts on significant historic resources as defined under the thresholds. However, as discussed earlier, the updated analyses conducted in December 2001 indicate that the residences at 702 and 714 North Grand Avenue appear to be eligible for listing in the Santa Ana Register of Historical Property. Although not defined as such in the thresholds provided earlier, properties on and eligible for listing on the Santa Ana Register are considered significant and important resources in the City. Therefore, the removal of these structures as a result of Alternative 1 would be a significant adverse impact of the proposed Grand Avenue widening. Mitigation measure CR -7 is provided later to address the impact of Alternative 1 on these structures. The construction of Alternative 1 could result in adverse impacts on previously unknown buried historical resources. These impacts will be mitigated to below a level of significance based on implementation of measures CR -1 to CR -6, described later in this section. F.•IPROJ-ENMGrand eirWew Text- GrandlSection 3 SplitlSection 3.7.doc Page 3.7-9