Laserfiche WebLink
Chapter 2. Results of the Noise Study <br />Report <br />The NSR for this project was approved in January 2019. <br />2.1. Noise Impact Locations <br />Potential long-term noise impacts associated with project operations are solely from <br />traffic noise. Traffic noise was evaluated for the worst -case traffic condition. Using <br />coordinates obtained from the topographic maps, 92 receptor locations associated <br />with existing single- and multifamily residences, a medical office, Fairview Triangle, <br />SART, vacant land, and commercial and light industrial uses were identified as <br />receptors within the study area. Figure 2-1 shows these receptor locations. <br />Future traffic noise levels at all 92 receptor locations were determined using either the <br />worst -case traffic operations (prior to speed degradation) or the 2040 a.m. peak -hour <br />traffic volumes, whichever were lower. The worst -case traffic condition is assumed to <br />be level of service (LOS) C and is generally loudest when vehicles on a given <br />roadway travel at free -flowing traffic conditions. Accordingly, the worst -case traffic <br />volume assumptions are based on the maximum number of vehicles that can typically <br />travel in a given lane while still resulting in free -flowing traffic conditions. The <br />worst -case traffic condition is assumed to be 750 vehicles per lane per hour (vplph) <br />on Fairview Street and other local roadways. The a.m. peak -hour traffic volume was <br />selected over the p.m. peak -hour traffic volume because the worst -hour noise levels <br />based on the long-term (24-hour) noise level measurements occur during the a.m. <br />hour. The a.m. and p.m. peak -hour traffic volumes were obtained from the Traffic <br />Impact Analysis (LSA 2018). <br />The modeled future noise levels with the project were compared to the modeled <br />existing noise levels (after calibration) from Traffic Noise Model (TNM) 2.5 to <br />determine whether a substantial noise increase would occur. The modeled future <br />noise levels were also compared to the NAC to determine whether a traffic noise <br />impact would occur. <br />Fairview Street Improvements from 9th Street to 16th Street 11 <br />and Bridge Replacement Project Noise Abatement Decision Report <br />