55C - RESO - BRISTOL ST IMPROVEMENTS

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ENVIRONMENTAL IMPACT REPORTADDENDUM Bristol Street Widening Phase IIIB — Washington Avenue to 17" Street Mitigation Measures No new additional mitigation measures are required. 3.12 Noise This section corresponds with Section IV - Environmental Consequences and Mitigation Measures, Subsections I - Noise, and V - Construction Impacts of the 1990 FEIS /EIR. a.) Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? The proposed Project involves widening of Bristol Street between Washington Avenue and 17`11 Street in an area that consists primarily of residential uses with some commercial uses (Category C) on the east side of Bristol Street. Santa Ana College comprises the area on the west side of Bristol Street between Washington Avenue and 17`h Street. As detailed in the Noise Study Report prepared by URS Corporation (2012c), noise abatement in the form of noise barriers, as originally presented in the 1990 FEIS/EIR, is not required for the Phase IIIB Project using current noise modeling methodology. Mitigation Measures No mitigation is required related to the operational (with- widening) phase of the Project; noise abatement in the form of noise barriers (sound walls) is no longer required based on the updated Project noise analysis. b.) Exposure of persons to or generation of excessive groundborne vibration or groundborne noise levels? Refer to response in 3.12 (a.), above. During Project construction, noise associated with construction may intermittently dominate the noise environment in the immediate area of construction. As described in the Noise Study Report prepared by URS Corporation (2012c), typical construction equipment for roadway construction is expected to generate noise levels ranging from 74 to 89 decibels (dB) at a distance of 50 feet. However, no additional adverse noise impacts from construction are anticipated as construction would comply with the City of Santa Ana Municipal Code, which limits construction noise to the least noise sensitive portions of the day. Construction equipment would be properly fitted and maintained according to the manufacturer's specifications. Furthermore, construction noise would be short -term, temporary, and cease upon completion of the proposed Project. Impacts would be similar to those identified in the 1990 FEIS /EIR with implementation of mitigation measures, as identified in the 1990 FEIS/EIR. Mitigation Measures No new additional mitigation measures are required. ANA 111 -334 (PER- 02 -01) CITY OF SANTA ANA (11/25/2013 REV2) 132897 CM PAGE 43 55C -58