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Chapter 6. Existing Noise Environment <br />Table 6.2. Meteorological Conditions During Noise Monitoring <br />Date <br />Temperature (°F) <br />Average Wind Speed mph <br />Relative Humidity (%) <br />4/17/2018 <br />58.0-78.8 <br />2.4-6.4 <br />23.1-77.5 <br />5/10/2018 <br />71.0 <br />3.0 <br />60.0 <br />Source: Compiled by LSA (May 2018). <br />IF = degrees Fahrenheit <br />mph = miles per hour <br />6.2.2. Long -Term Monitoring <br />Long-term traffic noise level measurements were conducted to document the peak <br />traffic noise hour. Long-term ambient noise monitoring was conducted using one <br />dosimeter at two representative locations in the project area. The long-term noise <br />level measurement at LT-1 was performed from 9:00 a.m. on Tuesday, April 17, <br />2018, to 9:00 a.m. on Wednesday, April 18, 2018, at a single-family residence at <br />1008 North King Street. Table 6.3 shows that traffic noise peaks during the 6:00 a.m., <br />7:00 a.m., and 8:00 a.m. hours at LT-1. The long-term noise level measurement at <br />LT-2 was performed from 2:00 p.m. on Wednesday, April 18, 2018, to 2:00 p.m. on <br />Thursday, April 19, 2018, at a single-family residence at 2505 West 16th Street. <br />Table 6.4 shows that traffic noise peaks during the 8:00 a.m. hour at LT-2. The long- <br />term noise monitoring locations are shown on Figure 5-1. The long-term noise level <br />measurement results are shown in Tables 6.3 and 6.4. <br />6.3. Noise Model Calibration <br />Eight separate model runs for the 15 monitoring locations were conducted using the <br />traffic counts and observed vehicle speeds collected during the ambient noise <br />monitoring. The results of these model runs were compared to the measured ambient <br />noise levels to ensure the accuracy of TNM 2.5. Correction factors known as <br />K-factors were applied to each of the modeled receptor locations so that the <br />monitored and modeled noise levels were the same. Table 6.5 shows the measured <br />ambient noise level, the modeled noise levels using traffic counts and measured <br />vehicle speeds during noise monitoring, and the K-factor at each of the 15 monitored <br />locations. <br />As shown in Table 6.5, some of the monitoring locations have K-factors greater than <br />3 dBA but less than 5 dBA. Based on Section 4.4.1.6 of the TeNS, K-factors between <br />3 and 4 can be calibrated unless the validity of the noise measurement conducted is in <br />serious doubt. <br />.................................................................................................................... <br />Fairview Street Improvements from 9th Street to 16th Street 35 <br />and Bridge Replacement Project Noise Study Report <br />