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4.6 – Noise Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.6-11 than the lowest ambient noise measurements conducted in the Project vicinity (54 dBA Leq at ST2). At residences located farther away, such as the residences located approximately 3,300 feet away, noise levels would range from approximately 37 dBA Leq during the architectural coating phase to approximately 51 dBA Leq during grading. Construction work may be audible at times but would not be considered intrusive by a person of average sensibilities. Additionally, the noise levels would be well below the 80 dBA Leq 8-hr threshold recommended by the FTA in the absence of a local numerical construction noise standard. Because construction noise would be below the threshold of significance and because the construction work would not take place before 7 a.m. or after 7 p.m. (the more restrictive of the two local construction noise prohibitions, from the City of Tracy) the construction noise impact would be less than significant, and no mitigation is required. Off-Site Roadway Construction Noise The Project would result in local, short-term increases in roadway noise as a result of construction traffic. Based on information provided by the Project applicant and verified construction assumptions developed as part of the Project’s air quality/greenhouse gas analysis, Project-related traffic would include workers commuting to and from the Project site and vendors bringing materials; there would be no haul trucks bringing or removing excavated soils to or from the Project site. Construction worker estimates and vendor truck trips would consist of the following: • Typical average daily worker trips of 16 to 30 trips per day (all phases except the building construction phase). • Typical average daily vender truck trips of 4 to 9 trips per day (all phases except the building construction phase). • 100 average daily worker trips during the building construction phase. • Up to 20 average daily vendor truck trips during the building construction phase. Using the construction trip estimates and the Federal Highway Administration’s Traffic Noise Prediction Model (TNM 2.5) (FHWA 2004), traffic noise level modeling was performed to estimate the temporary increase in noise from construction worker and heavy truck trips when added to existing traffic vo lumes. Based on a review of average daily traffic volumes by the Project’s transportation analysts, West Schulte Road currently carries approximately 8,403 vehicles per day between South Lammers Road and Hansen Road, and approximately 12,826 vehicles per day between Hansen Road and Mountain House Parkway. The average daily traffic volumes cited above for West Schulte Road were used as the basis to which the typical and peak-period construction vehicles were added for the purpose of estimating the resulting traffic noise increase during Project construction. Traffic modeling input and output files are provided in Appendix E-3. As shown in Table 4.6-6, during typical construction work, the increase in average hourly traffic noise levels would be approximately 0 dB when rounded to whole decibels along West Schulte Road (the roadway along which all of the construction vehicles would travel). During the building construction phase, when the number of daily worker and vendor trips would be at the peak, the increase would be approximately 0 to 1 dB when rounded to whole decibels. Although individual truck pass-bys would be clearly audible, the change in the traffic noise level on an hourly average basis would be negligible. A change in noise level of 3 dB or less is typically not readily perceptible to the average listener. Therefore, traffic related to construction activities would not result in 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. Impacts from Project-related construction traffic noise would be less than significant, and no mitigation is required.