2018-075 - Final Subsequent Environmental IMpact Report No. 2018-15

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City of Santa Ana Impact Statement Impact 4.7-E3: Construction activities associated with the Elan Project would generate a substantial temporary increase in ambient noise levels. Impact Summary development of residential uses in areas where noise levels exceed the 65 dBA threshold. The closest sensitive receptors to the Elan Project site would experience average noise levels in the range of 57 to 75 dBA as a result of construction activities. Noise levels at the higher end of this range would exceed the ambient noise levels by up to 10 dB, which would be clearly noticeable and could generate a temporary nuisance. 2. CEQA Findings Findings Implementation of mitigation measure MM -OZ 4.9-6 would ensure that noise levels within interior living spaces of residential units do not exceed the 45 dBA CNEL interior noise standard established in the City's General Plan; mitigation measure MM -OZ 4.9-7 would require the installation of shielding around HVAC systems; and mitigation measure MM- NOI-1 would ensure that exterior noise control is provided as necessary to comply with the City's exterior noise guidelines as specified in the Noise Element of the General Plan. With implementation of these mitigation measures, impacts would be reduced to less than significant. Finding 1. Changes or alterations have been required in, or incorporated into the project which avoid, substantially lessen, or reduce the magnitude of the significant environmental effect. Implementation of mitigation measures MM -OZ 4.9-1 through MM -OZ 4.9-4 from the MEMU EIR and compliance with the Municipal Code would reduce potential impacts to less than significant. Impact 4.7-E4: Construction of the Elan Project Sensitive receptors that are at or within 50 feet Findings 1 and 3. No additional feasible could generate or expose persons or structures of potential project construction sites may mitigation is available. to excessive groundborne vibration. experience vibration levels during construction activities that exceed the FTA's vibration impact Implementation of mitigation measures MM -OZ threshold of 85 VdB for human annoyance. So 4.9-1 through MM -OZ 4.9-4 from the MEMU long as pile driving is not used and construction EIR would reduce potential impacts but not to a occurs more than 50 feet from sensitive less -than -significant level for sensitive receptors, the impact associated with receptors within 50 feet for which impacts groundborne vibration generated by the Metro East Mixed -Use Overlay District Expansion and Elan August 2018 Development Projects 2-18 ICF 19.18 Findings of Fact/Statement of Overriding Considerations