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Grand Avenue Widening Project Environmental Impact Report Section 3.0 3.7.2 THRESHOLDS OF SIGNIFICANCE RELATED TO CULTURAL RESOURCES The proposed Grand Avenue Widening will be considered to have a significant impact on cultural resources if it: Disrupts or adversely affects a prehistoric or historic archaeological site or a property of historic or cultural significance to a community or ethnic or social group. 2. Conflicts with established recreational, educational, religious or scientific uses of the area. 3. If the cultural resource potential is medium to high, the impact is considered potentially significant. 4. Involve the demolition of an historic structure listed on the National Register of Historic Places. 5. Involves the demolition of an historic building which has been officially listed by the City of Santa Ana as a contributing structure to an historic structure. 6. A project, including the alteration or rehabilitation of an historic structure or area, which has been identified as significant by the criteria identified above, to a level that destroys the historical significance of such an historic property or area or does not maintain the architecture and identify of a property or area, is considered to have a significant impact. Is adjacent to or touching a historically significant structure or area may cause a significant impact on the historical property. This may include, but is not limited to activities such as heavy construction adjacent to an historic building which may weaken the structure, new development adjacent to an historic structure which diminishes the integrity and identity of the historically significant structure or area, etc. These thresholds of significance are consistent with the determination of significance process for historical resources based on the National Register of Historic Resources, the California Register and the City of Santa Ana Register of Historic Property. 3.7.3 METHODOLOGY RELATED TO CULTURAL Archival Research and Record Search An archival review and record search were conducted at the South Central Coastal Information Center (SCC), at the Fowler Museum, University of California, Los Angeles, on April 9, 1997 and were updated on September 29, 1998. The archival review and record research were updated again on February 26, 2001 at the SCC at California State University, Fullerton. The SCC is the State Historic Preservation Office (SHPO) designated archive for historic and prehistoric site records, inventory listings and reports for Los Angeles, Orange and Ventura Counties. Historic maps for Orange County were also reviewed at the SCC. Sources reviewed for the proposed Grand Avenue widening included: F: IPROJ-ENMGrand eirlNew Text - GrandlSection 3 SplitlSection 3.7.doc Page 3.7-7