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ENVIRONMENTAL IMPACT REPORTADDENDUM <br />Bristol Street Widening Project Warner Ave to Saint Andrew Place (Phase IV) <br />(b) Exposure of persons to or generation of excessive groundborne vibration or groundborne noise <br />levels? <br />Refer to response in 3.12 (a.) above. Project construction will involve typical groundborne noise and <br />vibration. However, the majority of construction activities will consist of standard procedures, and will be <br />relatively limited for any particular area. Construction activities would comply with the City of Santa Ana <br />Municipal Code, which limits construction noise to the least noise sensitive portions of the day. Impacts <br />would be similar to those identified in the 1990 Final EIS /EIR with implementation of mitigation measures <br />as included in the 1990 Final EIS /EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />(c) A substantial permanent increase in ambient noise levels in the project vicinity above levels <br />existing without the project? <br />Refer to response in 3.12 (a.) above. During construction of the proposed project, the noise associated with <br />construction may intermittently dominate the noise environment in the immediate area of construction. <br />Typical construction equipment for roadway construction is expected to generate noise levels ranging from <br />74 to 89 decibels (0) at a distance of 50 feet. However, no additional adverse noise impacts from <br />construction are anticipated as construction would comply with the City of Santa Ana Municipal Code, <br />which limits construction noise to the least noise sensitive portions of the day. Construction equipment <br />would be properly fitted and maintained according to the manufacturer's specifications. Furthermore, <br />construction noise would be short-tern, temporary and cease upon completion of the proposed project. <br />Impacts would be similar to those identified in the 1990 Final EIS/EIR with implementation of mitigation <br />measures, as identified in the 1990 Final EIS /EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />(d) A substantial temporary or periodic increase in ambient noise levels in the project <br />vicinity above levels existing without the project? <br />Refer to responses 3.12 (c), above, for discussion regarding temporary noise impacts associated with <br />construction. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />(e) For a project located within an airport land use plan or, where such a plan has not been <br />adopted, within two miles of a public airport or public use airport, would the project <br />expose people residing or working in the project area to excessive noise levels? <br />The project site is not located within an airport land use plan. The nearest airport is the John Wayne Airport <br />approximately 3.5 miles southeast of the southernmost Phase IV project intersection. No impacts would <br />occur. Impacts would be similar to those identified in the 1990 Final EIS/EIR. <br />Mitigation Measures <br />No new additional mitigation measures are required. <br />(f) For a project within the vicinity of a private airstrip, would the project expose people residing <br />or working in the project area to excessive noise levels? <br />ANA 305 -194 (PER 02) CSA (AUGUST 2014) 133867 YU 48 <br />