Laserfiche WebLink
City of Santa Ana <br />Community Plan Exemption Checklist <br />Gary Avenue Business Park Project <br />adjust the alarm level based on the background noise level or switch off back-up alarms <br />and replace with human spotters in compliance with all safety requirements and laws. <br />• Erect temporary noise barriers (at least as high as the exhaust of equipment and breaking <br />line -of -sight between noise sources and sensitive receptors), as necessary and feasible, to <br />maintain construction noise levels at or below the performance standard of 80 dBA Leq. <br />Barriers shall be constructed with a solid material that has a density of at least 4 pounds <br />per square foot with no gaps from the ground to the top of the barrier. <br />Proposed Project Applicability: Mitigation Measure N-1 is applicable to the proposed Project and will be <br />included in the Project MMRP. <br />N-2 Prior to issuance of a building permit for a project requiring pile driving during construction within <br />135 feet of fragile structures, such as historical resources, 100 feet of non -engineered timber and <br />masonry buildings (e.g., most residential buildings), or within 75 feet of engineered concrete and <br />masonry (no plaster); or a vibratory roller within 25 feet of any structure, the project applicant shall <br />prepare a noise and vibration analysis to assess and mitigate potential noise and vibration impacts <br />related to these activities. This noise and vibration analysis shall be conducted by a qualified and <br />experienced acoustical consultant or engineer. The vibration levels shall not exceed Federal Transit <br />Administration (FTA) architectural damage thresholds (e.g., 0.12 inches per second [in/sec] peak <br />particle velocity [PPV] for fragile or historical resources, 0.2 in/sec PPV for non -engineered timber <br />and masonry buildings, and 0.3 in/sec PPV for engineered concrete and masonry). If vibration <br />levels would exceed this threshold, alternative uses such as drilling piles as opposed to pile driving <br />and static rollers as opposed to vibratory rollers shall be used. If necessary, construction vibration <br />monitoring shall be conducted to ensure vibration thresholds are not exceeded. <br />Proposed Project Applicability: Mitigation Measure N-2 is not applicable to the proposed Project because <br />the Project does not involve pile driving and no fragile structures are located near the Project site. <br />N-3 New residential projects (or other noise -sensitive uses) located within 200 feet of existing railroad <br />lines shall be required to conduct a groundborne vibration and noise evaluation consistent with <br />Federal Transit Administration (FTA)-approved methodologies. <br />Proposed Project Applicability: Mitigation Measure N-3 is not applicable to the proposed Project because <br />the Project does not involve development of residences and the site is not within 200 feet of a railroad. <br />N-4 During the project -level California Environmental Quality Act (CEQA) process for industrial <br />developments under the General Plan Update or other projects that could generate substantial <br />vibration levels near sensitive uses, a noise and vibration analysis shall be conducted to assess and <br />mitigate potential noise and vibration impacts related to the operations of that individual <br />development. This noise and vibration analysis shall be conducted by a qualified and experienced <br />acoustical consultant or engineer and shall follow the latest CEQA guidelines, practices, and <br />precedents. <br />Proposed Project Applicability: Mitigation Measure N-4 is applicable to the proposed Project and an <br />acoustical assessment has been completed and provided in Appendix K. <br />82 <br />