2009-034 (2) - Final Supplemental Environmental Impact Report for Fairhaven/Lincoln

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S. Environmental Analysis iE environment is currently disrupted by approximately eight trains that travel on the Oran a oun These noise levels already exceed City noise ordinance standards. While the frequency and duration of train noise is low, approximately one train every hour, the magnitude of noise from the trains is high (approximate l 115 dBA at 50 feet) . Noise from construction activities would be higher than an er�viror�rx�ent a�ppro�cirnatery dB at 0 feet without trains. ambient nose Given the current schedule of nigh time trains however, construction noise would not result in a substantial noise increase over existing conditions. Construction equipment noise world be substantially lower than the m nitud 9 ons, trains and therefore nighttime construction significant of noise generated by the ors noise world not be a significant nose impact. 5.2.5 Cumulative Impacts Cumulative noise impacts occur when multiple sources of noise, though individually not substantial combine and lead to excessive cumulative noise exposure at noise - sensitive uses. Short- Terra Construction Phase Activities Cumulative construction noise impacts have the potential to occur when multiple construction ' roects in the same general area generate noise within the same time frame and contribute p � to the increases �n the ambient noise environment. No other construction activities are proposed in the project vicinity. Furthermore, the City of Santa Ana allows for the generation of construction noise during the daytime hours. Bas d n noise levels generated by construction activities associated with the proposed project site, the duration of construction activities, and the presence of high magnitude of train horn noise, construction noise from the proposed project would not significantly contribute to the cumulative noise environment. p Long -Term Operational Phase Activities The project - related traffic circulation and associated traffic noise levels represents the project's cumulative contribution to increases in the ambient noise environment along roadway segments analyzed. Traffic noise produced by project - related vehicles would not grange and mould not contribute to any possible future noise increases in the area. In consideration of the preceding factors, the project's contribution to cumulative noise would be less than significant, and therefore, project impacts would not be cumulatively considerable. 5,2.6 Existing Regulations and Standard on it ons • City of Santa Ana Municipal Code, Article 111, Morse Control. 5.2.7 Level of Significance Before Mitigation Upon implementation of regulatory requirements and standard conditions of approval, impact 5.2-1 and Impact 5.2-2 world be less than significant. 5.2:8 Mitigation Measures No mitigation measures are required. 5.2.9 Level of Significance After Mitigation Noise impacts would be less than significant and no mitigation measures are required. Based on Metrol ink and Amtrak passenger trains and BN F freight projections from the 2002 EIR. FairhavenlLincoln and Santa ClaralLincoln Intersection Modifications City of Santa 4 e 5.2 -11 Supplement ,3upplement to tbeSanta Ana Second Main Track Project I L Resolution No. 2009 -034 Page 77 of 130