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<br />Noise and Air QuaHty Analy~is <br />Centerville EA W <br /> <br />2.3.1 l\Iinnoise Model <br /> <br />The Minnoise model is a modified (modified by the Minnesota Department of <br />Transportation) version of the Federal Highway Administration's Optima/Stamina model <br />that is used to predict noise levels from highway projects and to assist with the <br />developmem of noise barriers. <br /> <br />2.3.2 Model Assumptions <br />Noise level predictions were based on the following data and assumptions: <br /> <br />· The noise analysis was completed for the peak afternoon rush hour and the peak <br />nighttime hOUL <br />· Traffic data for existing conditions and years 2012 and 2030 for the study was <br />generated by Bonestrooo <br />· Shielding from natural or man-made baniers was not considered. <br />. The analysis assumed acoustically soft ground cover between the roadvv'ay and all <br />receiver locationso <br />. A vehicle mix of two percent heavy trucks and two percent medium trucks was used <br />for the analysis. <br />. Constant vehicle speeds of 30 mph on Main Street and Centervil1e Road were used <br />for the modeling analysis. <br /> <br />2.3.3 Modeled Noise Levels and Discussion <br />Tables 2 and 3 provide the results of the tr3ffic noise modeling analysis for daytime and <br />nighttime peak hours. <br /> <br />Predicted Daytime Noise Lel'el DiscLlssion <br />The results indicate that the modeled residential building receptor locations are predicted <br />to have noise levels within the State standard for the year 2012. Locations R3, and R6 are <br />at or above the standards with 2030 traffic volumes. This indicates rhat there would be <br />sorne speech interference from the traffic noise for persons outside on the street side of <br />these buildings dUling 2030 peak traffic periods. <br /> <br />The predicted noise level changes between the existing and year 2012 result from <br />additional traffic generated by the development and by olher area growth. The noise level <br />increase for this period is predicted to be 3 dBA or less at all modeled receptor locations. <br />The ~1PCA considers changes of 3 dBA or less to be imperceptible. <br /> <br />Predicted Nighnime Noise Lerel Discussio!l <br />TJole 2 indicates that all modeled residentiall'eceptor locations. e.\cept location R7 <br />would have nighttime traffic noise levels above the ~vlinl1esota standeml for modeled years <br />2012 and 2030. This standard is based on sleep interference for people sleeping in <br />bedroorns \Vltl1 pclrtially lipen \vinelovvs. Residences in the,,::, :1I'ca" should have ye'lr-nHmd <br /> <br />+ <br />