2024-053 - Final Supplemental for The Related Bristol Specific Plan Project

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• During the entire active construction period and to the extent feasible, the use of noise - producing signals, including horns, whistles, alarms, and bells, shall be for safety warning purposes only. The construction manager shall use smart back-up alarms, which automatically adjust the alarm level based on the background noise level, or switch off back-up alarms and replace with human spotters in compliance with all safety requirements and laws. • Erect temporary noise barriers (at least as high as the exhaust of equipment and breaking line -of -sight between noise sources and sensitive receptors), as necessary and feasible, to maintain construction noise levels at or below the performance standard of 80 d BA Leq. Barriers shall be constructed with a solid material that has a density of at least 4 pounds per square foot with no gaps from the ground to the top of the barrier. Mitigation Measure N011-1: Prior to the issuance of construction/'grading permits, the Project Applicant shall obtain a permit from the City's Building and Safety Division to complete work outside the standard construction hours outlined in Santa Ana Municipal Code Section 1$-314(e). In addition, the Project Applicant and/'or contractor(s) shall develop a nighttime construction noise control plan that requires the following: Stationary equipment such as generators and air compressors shall adhere to the following: • Stationary equipment (e.g., generators, air compressors, etc.) shall be located 300 feet or more away from residences. • Stationary equipment shall be surrounded with noise barriers to achieve a minimum 10 dBA reduction. Alternatively, a temporary noise barrier may be used along the property line. Mobile equipment such as concrete mixer trucks, pump trucks shall adhere to the following: • The nighttime noise control plan shall prohibit mobile equipment and trucks from operating within the following distances to offsite sensitive receptors: ■ Phase 1: Trucks and equipment shall be 140 feet or more away from the Versailles residences along Plaza Drive. ■ Phase 2: No minimum distance required (Phase 2 is 410 feet from sensitive receptors and would not exceed thresholds). ■ Phase 3: Trucks and equipment shall be 150 feet or more away from the Versailles residences along Plaza Drive. • The nighttime noise control plan shall prohibit mobile equipment and trucks from operating within the following distances to onsite sensitive receptors: ■ Phase 1: No minimum distance is required because no onsite receptors would be constructed prior to Phase 1. ■ Phase 2: Trucks and equipment shall be 150 feet or more away from Phase 1 onsite residences.