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4.6 – Noise Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.6-8 Significance Criteria Construction Noise Construction activity noise would be considered significant if it exceeds an 8-hour average noise level of 80 dBA Leq at or beyond a noise-sensitive receiver’s property boundary, or if the allowable hours of construction are exceeded (6 a.m. to 9 p.m. in unincorporated San Joaquin County or 7 a.m. to 7 p.m. in the City of Tracy). Off-Site Project-Attributed Transportation Noise A traffic noise impact would be considered significant if a project’s contribution results in an exceedance of applicable noise standards or if the project resulted in an increase in traffic noise greater than 3 dB CNEL at an existing noise-sensitive land use. On-Site Project-Attributed Stationary Noise A noise impact would be considered significant if noise from typical operation of heating, ventilation, and air conditioning (HVAC) and other electro-mechanical systems or other on-site operational noise associated with a project resulted in an exceedance of applicable noise standards or if the project resulted in an increase in ambient noise greater than 3 dB CNEL at an existing noise-sensitive land use. Vibration Guidance from the FTA indicates that a vibration velocity level of 75 VdB received at a structure would be considered potentially annoying by occupants (FTA 2018). As for the receiving structure itself, aforementioned FTA guidance discussed in Section 4.6 .2, Relevant Plans, Policies, and Ordinances, recommends t hat a vibration level of 0.2 inches per second PPV would represent the threshold for building damage risk for non - engineered timber and masonry construction. Although the nearest residences are likely more robust, this analysis conservatively uses this sta ndard. 4.6.4 Impacts Analysis Threshold A: Would the Project result in 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? Less-Than-Significant Impact. The Project would not result in the 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, as discussed further below. Short-Term Construction Impacts Based on information provided by the Project applicant, it was assumed that construction of the Project would commence in July 2021 and would last approximately 10 months, ending in April 2022. During construction of the Project, activities would include site preparation, grading, construction of structures, paving, and application of architectural coating. Construction-related noise would also be generated on local roadways and from worker vehicles and trucks accessing the Project site.