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4.8 Noise 4.8 NOISE This FIR section evaluates the potential effects of noise and groundborne vibration associated with construction and operational activities that could occur as a result of implementation of the proposed Transit Zoning Code (SD 84A and SD 8413) area. The Initial Study (Appendix A) identified the potential for impacts to occur associated with a substantial temporary and/or permanent increase in ambient noise levels within or around the Transit Zoning Code (SD 84A and SD 8413) area. Additionally, the Initial Study identified the potential for people to be exposed to excessive noise levels, groundborne vibration, or groundborne noise levels in excess of standards established in the local General Plan or noise ordinance. Potential direct and indirect impacts resulting from construction and operation of the proposed projects are identified, and potential mitigation measures that could avoid or reduce these impacts are recommended, where feasible. Issues scoped out include proximity to, or association with, an airport land use plan or airstrip. While the proposed project area is located outside of the 20,000-foot notification area as required by the Orange County Airport Land Use Commission (ALUC), the project must still comply with the Airport Environs Element that was adopted by the City of Santa Ana in 2008, in order to comply with the Airport Environs Land Use Plan (AELUP) for Orange County. Refer to Chapter 4.5 (Hazards and Hazardous Materials) for analysis of this issue. Data used to prepare this report were taken from the Traffic Impact Analysis Report prepared by KOA Corporation for the proposed project, and information obtained by measuring and modeling existing and future noise levels at the Transit Zoning Code (SD 84A and SD 84B) area and in the surrounding area. Three comment letters associated with noise were received in response to the Notice of Preparation circulated for the proposed project. The comment letters can be found in Appendix A. 4.8.1 Existing Conditions The project is located in the central urban core of Santa Ana and comprises approximately 100 blocks and 450 acres of land. The proposed project is generally bounded by First Street, Flower Street, Civic Center Drive, Grand Avenue, and Interstate 5 (I-5). More specifically, the proposed project is located in the area west of I-5, north of First Street, and between Grand Avenue and Flower Street and south of Civic Center Drive in the City of Santa Ana in Orange County, California. Several roadways provide access to properties within the Transit Zoning Code (SD 84A and SD 8413) area, including Civic Center Drive, Fourth Street, First Street, and Santa Ana Boulevard, which run east - west through the area, and Flower Street, Main Street and Grand Avenue, which run north -south through the area. The Transit Zoning Code (SD 84A and SD 8413) area includes the Government Center, downtown area, the Logan and Lacy neighborhoods, and the industrial parks surrounding the Santa Ana Regional Transportation Center (SARTC). The surrounding land uses include residential, professional, City of Santa Ana Transit Zoning Code (SD 84A and SD 84B) EIR 4.8-1