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Community Plan Exemption Checklist City of Santa Ana Gary Avenue Business Park Project 77 Operational Vibration Impacts. The GPU EIR discussed that commercial and industrial operations would generate varying degrees of ground vibration, depending on the operational procedures and equipment. The EIR determined that with implementation of Mitigation Measures N-3 and N-4 and adherence to associated performance standards, impacts would be reduced to less-than-significant. Mitigation Measures N-3 and N-4 would reduce potential vibration impacts from commercial/industrial uses and proposed uses near existing railroads and facilities to less-than-significant levels. The GPU EIR determined that buildout of the GPU would not result in exposure of future residents and/or workers to excessive airport-related noise. Impacts Associated with the Proposed Project a) Generation of substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? No New Impact. General Plan Noise Standards The GPU includes standards related to excessive noise levels. The City’s General Plan noise standards for noise-sensitive land uses are provided in Table N-1. Table N-1: City of Santa Ana Noise Element Standards Land Use Category Sensitive Land Use Noise Level (dBA CNEL) Interior Exterior Residential Single-family, duplex, multi family 45 65 Institutional Hospital, school classroom/playgrounds, church, library 45 65 Open Space Parks -- 65 Source: City of Santa Ana Noise Element City of Santa Ana Municipal Code Pursuant to the City’s Municipal Code Section 18-313, noise levels at residential properties are restricted from exceeding certain noise levels for extended periods of time. Table 5.10-3 provides the Municipal Code exterior noise standards that are applied to residential properties. Table N-2: City of Santa Ana Municipal Code Residential Noise Standards Time Permissible Noise Levels (dBA) L50 L25 L8 L2 Lmax 10:00 p.m. to 7:00 a.m. 50 55 60 65 70 7:00 a.m. to 10:00 p.m. 55 60 65 70 75 Source: City of Santa Ana Municipal Code, Article VI, Section 18-312. With respect to construction-related noise, Section 18-314 (Special Provisions) of the City’s Municipal Code specifies that noise sources associated with construction activities are exempt from the City’s established noise standards as long as the activities do not take place between the hours of 8:00 p.m. and 7:00 a.m. on weekdays, including Saturday, or any time on Sunday or a federal holiday. Existing Noise Levels To quantify existing ambient noise levels in the Project area, noise measurements were conducted on April 8, 2021. As shown in table N-3, existing ambient noise ranges between 62.3 and 66.5 dBA Leq. 8/22/2022 Planning Commission 2 – 116