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Community Plan Exemption Checklist City of Santa Ana Gary Avenue Business Park Project 76 Project Peculiar Impact that is not Substantially Mitigated by Uniformly Applied Policies Significant Impact not Analyzed as Significant in the Prior EIR Potentially Significant Offsite or Cumulative Impact not Discussed in the prior EIR Adverse Impact More Severe based on Substantial New Information No New Impact 5.13 NOISE. Would the project result in: a) Generation of a 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? b) Generation of excessive ground borne vibration or ground borne noise levels? c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? Summary of Impacts Identified in the GPU EIR The Final Recirculated GPU EIR addressed noise impacts on pages 5.12‐29 through 5.12‐50. Construction Noise. The GPU EIR described that Mitigation Measure N-1 would reduce potential noise impacts during construction to the extent feasible. However, due to the potential for proximity of construction activities to sensitive uses, the number of construction projects occurring simultaneously, and the potential duration of construction activities, construction noise could result in a temporary substantial increase in noise levels above ambient conditions. Therefore, impacts would remain significant and unavoidable. Operational Noise. The GPU EIR determined that buildout of the GPU would cause a substantial traffic noise increase on local roadways and could locate sensitive receptors in areas that exceed established noise standards and that Mitigation Measure N-2 would reduce potential interior noise impacts to future noise- sensitive receptors below the thresholds. However, there are no feasible or practical mitigation measures available to reduce project-generated traffic noise to less than significant levels for existing residences along affected roadways. Thus, the GPU EIR determined that traffic noise would remain a significant and unavoidable impact. Construction Vibration Impacts. The GPU EIR discussed that construction activity would generate varying degrees of ground vibration, depending on the construction procedures and equipment, that has the potential to exceed the FTA criteria for architectural damage (e.g., 0.12 inches per second [in/sec] PPV for fragile or historical resources, 0.2 in/sec PPV for non-engineered timber and masonry buildings, and 0.3 in/sec PPV for engineered concrete and masonry). The EIR determined that implementation of Mitigation Measure N-2 and adherence to associated performance standards, would reduce impacts to a less-than-significant level. 8/22/2022 Planning Commission 2 – 115