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<br />;; <br /> <br />TABLE OF CONTENTS <br /> <br />INTRODUCTION 3 <br />Wave Motion 3 <br />Decihel Levels of Common Noise Sources 5 <br />USING DECIBELS 6 <br />Distance Attenuation Estimations 6 <br />Addition and Subtraction of Decihel Levels 7 <br />Background Noise Correction 8 <br />HUMAN PERCEPTION OF SOUND 9 <br />Perceived Change in Decibel Levels 9 <br />Weighting Networks 9 <br />MEASUREMENT PROCEDURES 11 <br />Errors Caused by Reflecting Ohjects 11 <br />NTP-l Measurement Procedures 12 <br />NTP-2 Test Procedure 13 <br />RULES OF THUMB 17 <br />REGULA TORY AGENCIES 18 <br />NOISE RULES AND STATUTES 19 <br />Minnesota Noise Pollution Control Rules 19 <br />Minnesota Motor Vehicle Noise Limits 26 <br />Minnesota Motorboat Noise Limits 29 <br />Minnesota Snowmobile Noise Limits 30 <br /> <br />2 <br />