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Table of Contents <br />Summary of Key Points 1 <br />Introduction 2 <br />Waves and Sound Pressure Level 2 <br />Decibel Levels of Common Noise Sources 3 <br />Using Decibel Measurements 4 <br />Sound Propagation and Sources 4 <br />Distance Attenuation Estimations 4 <br />Addition and Subtraction of Decibel Levels 5 <br />Background Noise 6 <br />Background Noise Correction 6 <br />Human Perception of Sound 7 <br />Weighting Networks 7 <br />Measurement Procedures 8 <br />NTP -1 Measurement Procedure for Non - Impulsive Noise 9 <br />NTP -2 Manual Measurement Procedure for Non - Impulsive Noise 10 <br />Noise Survey 12 <br />Regulatory Agencies 13 <br />Minnesota Noise Pollution Statue and Rule 14 <br />Minn. Stat. § 116.07 Powers and Duties 14 <br />Minn. Rules § 7030 Noise Pollution 15 <br />Minn. Rules § 7030.1000 Motor Vehicle Noise Limits 20 <br />Minn. Stat. § 86B Motorboat Noise Limits 24 <br />Minn. Stat. § 84.871 Snowmobile Noise Limits 25 <br />Minn. Rule. § 6100.5700 Snowmobile Noise Limits 25 <br />Figures <br />Figure 1: Weight on a Spring - Example of Periodic Motion 2 <br />Figure 2: Comparison of Periodic Motion to Sound Waves 3 <br />Figure 3: Decibel Levels of Common Noise Sources 4 <br />Figure 4: Distance Attenuation of Noise Levels from a Point Source 5 <br />Figure 5: Addition and Subtraction of Decibel Levels 5 <br />Figure 6: Background Noise Correction 6 <br />Figure 7: Change in Decibel Level and Perceived Change in Loudness 7 <br />Figure 8: Weighting Networks 7 <br />Figure 9: Errors Caused by Reflecting Objects 8 <br />