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4.6 – Noise <br />Draft Environmental Impact Report February 2021 <br />14800 W. Schulte Road Logistics Center 4.6-12 <br />Table 4.6-6. Project-Related Construction Vehicle Trip Noise <br />Roadway Segment <br />Existing <br />Noise <br />Level1 <br />(dBA Leq) <br />Existing plus Project <br />Construction Vehicles – <br />(Typical)1 (dBA Leq) <br />Existing plus Project <br />Construction Vehicles <br />– (Peak)1 (dBA Leq) <br />Increase <br />(Typical) <br />(dB) <br />Increase <br />(Peak) <br />(Leq dB) <br />West Schulte Road: <br />Mountain House <br />Road to Hansen <br />Road <br />69 69 69 0 0 <br />West Schulte Road: <br />Hansen Road to <br />South Lammers <br />Road <br />67 67 68 0 1 <br />Source: Appendix E-3 <br />Notes: <br />dBA = A-weighted decibel; Leq = average noise energy level; dB = decibel <br />1 Estimated noise levels at a distance of 100 feet from West Schulte Road centerline. <br />Long-Term Operational Noise <br />Off-Site Operational Noise (Traffic Noise Levels) <br />The Project would generate traffic along nearby roads, including West Schulte Road, South Lammers Road, Hansen <br />Road, and Mountain House Parkway. The traffic noise levels associated with selected roadways in the Project <br />vicinity were determined based on ambient noise measurements and using the Federal Highway Administration’s <br />TNM 2.5. Information used in the model included the Existing, Existing-with-Project, Future-without-Project, and <br />Future-with-Project traffic volumes. Traffic volumes for each of the previously mentioned scenarios are provided in <br />Appendix F. This traffic data was used to model noise levels under those scenarios. Noise levels were modeled at <br />representative noise-sensitive receivers. The receivers were modeled to be 5 feet above the local ground elevation. <br />The modeled results for the Existing, Existing-with-Project, Future-without-Project, and Future-with-Project scenarios <br />are summarized in Table 4.6-7, and the TNM input/output files are included in Appendix E-3. As shown in Table <br />4.6-7, the Existing-plus-Project and Future-with-Project traffic volumes would result in a noise level increase of 1 dB <br />or less (rounded to whole numbers) compared to the without-Project scenarios. Furthermore, the Project would not <br />result in an exceedance of the County of San Joaquin noise standard for transportation sources of 65 dBA Ldn or of <br />other applicable noise standards. As discussed in Section 4.6.3, Thresholds of Significance, off-site noise impacts <br />due to Project-generated traffic would be considered significant if the Project-generated traffic would cause an <br />increase of more than 3 dB or if applicable noise standards were exceeded. Because the maximum predicted traffic <br />noise increase would be 1 dB, the additional Project-related traffic volumes along the adjacent roads would not <br />substantially increase the existing or future noise levels in the Project vicinity, and operational traffic-related noise <br />impacts would be less than significant.