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

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increases, only projects and ambient growth in the nearby area could combine with the proposed Project to result in cumulative noise impacts. Development of the proposed Project in combination with the related projects would result in an increase in construction -related and traffic -related noise. However, each of the related projects would be subject to the operational noise standards established in Section 18-31 3 of the City's Municipal Code, which establishes the allowable exterior noise standards for various types of land uses in the City. In addition, Section 1 8-314 of the City's Municipal Code allows for construction activities to be exempt from the noise standards set forth in Sections 18-312 and 18-31 3 of the City's Municipal Code as long as these activities do not take place between the hours of 8:00 p.m. and 7:00 a.m. on weekdays, including Saturday, or anytime on Sunday or a federal holiday. In addition, the City of Tustin has a similar municipal code requirement related to construction noise. Construction noise is localized in nature and decreases substantially with distance. Consequently, in order to achieve a substantial cumulative increase in construction noise levels, more than one source emitting high levels of construction noise would need to be in close proximity to the proposed Project. The nearest development projects to the Project site include the South Coast Village Mixed -Use project that is adjacent to the southwest of the Project site and the Chick-Fil-A expansion project that is across Bristol Street to the northeast of the Project site. The Chick-Fil-A expansion project is currently in plan check and completion of construction of that project would likely be completed by the time construction of Phase 1 of the proposed Project commences. The South Coast Village Mixed - Use project is still in the early stages of entitlement. Therefore, there is potential that construction of the South Coast Village Mixed -Use project overlaps with construction of Phase 1 of the proposed Project. However, due to the size of the Project site, varying locations onsite where construction would occur, and the limited offsite construction noise levels that would be generated from the proposed Project, it would not combine to become cumulatively considerable, and cumulative noise impacts associated with construction activities would be less than significant. Cumulative construction could also result in the exposure of people to or the generation of excessive groundborne vibration. The proposed Project would result in limited vibration at 25 and 50 feet from construction activities. Due the rapid attenuation of groundborne vibration, the size of the Project site, and the location of the nearest project and limited potential for overlapping construction, the proposed Project would not result in vibration that could combine with other development projects. Thus, the proposed Project would not contribute to cumulative vibration impacts and impacts would be less than significant. Stationary noise sources that would be generated by the proposed Project would result in noise levels that would be below the existing City noise standards. Because the Project site is surrounded by roadways and proposed buildings and parking structures are setback from roadways, noise from the site would attenuate to diminish, and would not combine with other stationary sources of adjacent uses. Thus, stationary noise sources from the proposed Project would result in impacts that are less than cumulatively significant. Cumulative mobile source noise impacts would occur primarily as a result of increased traffic on local roadways due to the proposed Project and related projects within the study area. Therefore, cumulative traffic -generated noise impacts have been assessed based on the contribution of the proposed Project in the Project buildout condition. Cumulative increases in traffic noise levels were estimated by comparing the existing and Project buildout without and with Project scenarios. The