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Community Plan Exemption Checklist <br />City of Santa Ana Gary Avenue Business Park Project <br />Operational Vibration Impacts. The GPU EIR discussed that commercial and industrial operations would <br />generate varying degrees of ground vibration, depending on the operational procedures and equipment. <br />The EIR determined that with implementation of Mitigation Measures N-3 and N-4 and adherence to <br />associated performance standards, impacts would be reduced to less -than -significant. Mitigation Measures <br />N-3 and N-4 would reduce potential vibration impacts from commercial/industrial uses and proposed uses <br />near existing railroads and facilities to less -than -significant levels. <br />The GPU EIR determined that buildout of the GPU would not result in exposure of future residents and/or <br />workers to excessive airport -related noise. <br />Impacts Associated with the Proposed Project <br />a) Generation of substantial temporary or permanent increase in ambient noise levels in the <br />vicinity of the project in excess of standards established in the local general plan or noise <br />ordinance, or applicable standards of other agencies? <br />No New Impact. <br />General Plan Noise Standards <br />The GPU includes standards related to excessive noise levels. The City's General Plan noise standards for <br />noise -sensitive land uses are provided in Table N-1. <br />Table N-1: City of Santa Ana Noise Element Standards <br />Land Use Category <br />Sensitive Land Use <br />Noise Level (dBA CNEL) <br />Interior <br />Exterior <br />Residential <br />Single-family, duplex, multi family <br />45 <br />65 <br />Institutional <br />Hospital, school classroom playgrounds, church, library <br />45 <br />65 <br />Open Space <br />Parks <br />-- <br />65 <br />Source: City of Santa Ana Noise Element <br />City of Santa Ana Municipal Code <br />Pursuant to the City's Municipal Code Section 18-31 3, noise levels at residential properties are restricted <br />from exceeding certain noise levels for extended periods of time. Table 5.10-3 provides the Municipal Code <br />exterior noise standards that are applied to residential properties. <br />Table N-2: City of Santa Ana Municipal Code Residential Noise Standards <br />Time <br />Permissible Noise Levels (dBA) <br />Lso <br />L25 <br />L8 <br />L2 <br />Lmax <br />10:00 p.m. to 7:00 a.m. <br />50 <br />55 <br />60 <br />65 <br />70 <br />7:00 a.m. to 10:00 p.m. <br />55 <br />60 <br />65 <br />70 <br />75 <br />Source: City of Santa Ana Municipal Code, Article VI, Section 1 8-31 2. <br />With respect to construction -related noise, Section 18-314 (Special Provisions) of the City's Municipal Code <br />specifies that noise sources associated with construction activities are exempt from the City's established noise <br />standards as long as the activities do not take place between the hours of 8:00 p.m. and 7:00 a.m. on <br />weekdays, including Saturday, or any time on Sunday or a federal holiday. <br />Existing Noise Levels <br />To quantify existing ambient noise levels in the Project area, noise measurements were conducted on April <br />8, 2021. As shown in table N-3, existing ambient noise ranges between 62.3 and 66.5 dBA Leq. <br />77 <br />