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Figures Figure 1: Weight on a Spring -Example of Periodic Motion.................................................2 Figure 2: Comparison of Periodic Motion to Sound Waves.................................................3 Figure 3: Decibel Levels of Common Noise Sources............................................................4 Figure 4: Distance Attenuation of Noise Levels from a Point Source...................................5 Figure 5: Addition and Subtraction of Decibel Levels..........................................................5 Figure 6: Background Noise Correction............................................................................... 6 Figure 7: Change in Decibel Level and Perceived Change in Loudness ..............................7 Figure8: Weighting Networks...............................................................................................7 Figure 9: Errors Caused by Reflecting Objects....................................................................8 0 Table of Contents Summaryof Key Points.................................................................................................................1 Introduction....................................................................................................................................2 Waves and Sound Pressure Level...........................................................................................2 Decibel Levels of Common Noise Sources............................................................................3 UsingDecibel Measurements........................................................................................................4 Sound Propagation and Sources .............................................................................................4 Distance Attenuation Estimations...........................................................................................4 Addition and Subtraction of Decibel Levels...........................................................................5 BackgroundNoise..................................................................................................................6 Background Noise Correction................................................................................................6 HumanPerception of Sound.........................................................................................................7 WeightingNetworks...............................................................................................................7 MeasurementProcedures..............................................................................................................8 NTP-1 Measurement Procedure for Non-Impulsive Noise....................................................9 NTP-2 Manual Measurement Procedure for Non-Impulsive Noise.....................................10 NoiseSurvey.........................................................................................................................12 RegulatoryAgencies....................................................................................................................13 Minnesota Noise Pollution Statue and Rule..............................................................................14 Minn. Stat. § 116.07 Powers and Duties Minn. Rules § 7030 Noise Pollution...... .......:.......:...............................................................14 .15 Minn. Rules § 703 0. 1000 Motor Vehicle Noise Limits........................................................20 Minn. Stat. § 86B Motorboat Noise Limits..........................................................................24 Minn. Stat. § 84.871 Snowmobile Noise Limits...................................................................25 Minn. Rule. § 6100,5700 Snowmobile Noise Limits...........................................................25 Figures Figure 1: Weight on a Spring -Example of Periodic Motion.................................................2 Figure 2: Comparison of Periodic Motion to Sound Waves.................................................3 Figure 3: Decibel Levels of Common Noise Sources............................................................4 Figure 4: Distance Attenuation of Noise Levels from a Point Source...................................5 Figure 5: Addition and Subtraction of Decibel Levels..........................................................5 Figure 6: Background Noise Correction............................................................................... 6 Figure 7: Change in Decibel Level and Perceived Change in Loudness ..............................7 Figure8: Weighting Networks...............................................................................................7 Figure 9: Errors Caused by Reflecting Objects....................................................................8 0