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3. <br />Ambient peak one -hour equivalent noise levels <br />monitored <br />at <br />typical residential receptors ranged from 54 <br />dBA Leq to <br />73 <br />dBA Leq. <br />4. <br />Ambient peak one -hour equivalent noise levels <br />were 71 <br />dBA <br />Leq at a high school athletic area and 70 dBA <br />Leq two ele- <br />mentary school playgrounds. <br />5. <br />The FHW A noise modeling predicts that noise <br />levels at <br />75 <br />feet from the Bristol Street centerline are <br />currently <br />72 <br />dBA Leq or less. <br />6. <br />The FHWA noise modeling predicts that noise <br />levels at <br />75 <br />feet from the Bristol Street centerline are <br />currently <br />72 <br />CNEL or less. <br />Acoustic Impacts <br />1. Construction activities will generate short -term increases <br />in noise levels adjacent to site access routes and the areas <br />under construction at any given time. <br />2. Motor vehicle noise resulting from year 2006 traffic volumes <br />on Bristol Street with or without the proposed widening <br />project will constitute a long -term acoustic impact in the <br />immediate vicinity. <br />3. Roadway widths will change along Bristol Street after proj- <br />ect implementation causing changes in adjacent noise levels <br />( for future design year conditions. <br />4. Future noise contour locations (with respect to the center- <br />line) will be identical with all project alternatives, <br />5. Computer noise modeling shows that future- plus--project noise <br />levels will be 1 dBA Leq or less above future noise levels <br />under the no -build condition. <br />6. Boise levels with the "build" alternative will range from 69 <br />to 73 dBA Leq within the APEI. <br />7. Noise level increases with the "build" alternative at sensi- <br />tive receptors (in the absence of mitigation) will be 6 dBA <br />Leq or less above future "no- build" conditions. <br />8. Maximum one hour Leq values projected for the future design <br />year are detailed in Table 4 -9. Noise levels at sensitive <br />receptor locations will range from 55 to 71 dBA Leq regard- <br />less of the alternative. <br />9. Future design year noise levels will exceed federal criteria <br />at first line residential receptors with or without any <br />proposed project alternatives. <br />1 -3 <br />