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State Route 99/Pelandale Avenue Interchange Reconstruction Project
Noise Study Report
Client: City of Modesto (as subconsultant to Dokken Engineering)
Location: Modesto, California
LSA prepared a Noise Study Report for the proposed interchange improvement, located in the City of Modesto and the County of Stanislaus. The purpose of the Noise Study Report is to evaluate traffic noise impacts and consider noise abatement measures for affected noise-sensitive land uses. The Noise Study Report was prepared consistent with the Caltrans Traffic Noise Analysis Protocol to satisfy FHWA funding requirements. LSA identified 16 sensitive receptor sites and conducted noise measurements with concurrent traffic counts during off-peak hours when traffic was free flowing in order to characterize the existing noise levels and to calibrate the traffic noise model. Initial roadway noise modeling performed for the proposed project evaluated the existing alternative, cumulative 2035 no build alternative, and cumulative year 2035 plus project traffic noise level conditions for two proposed build alternatives. The results indicate that future traffic noise levels would not result in a substantial increase above existing conditions. However, future traffic noise levels at modeled sensitive receptors would approach or exceed the Caltrans Noise Abatement Criteria. Noise abatement measures were evaluated for all receptors that would be or would continue to be exposed to traffic noise approaching or exceeding the Noise Abatement Criteria. The feasibility and reasonable allowance of the modeled sound walls were determined based upon the guidelines of the Noise Analysis Protocol.
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