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Home My WebLink About21 - Superior Avenue Pedestrian/Bicycle Bridge and Parking Lot Project - PowerPoint (Public 2)November 19, 2019 Item No. 21 Sound Levels Leq = Equivalent Continuous Sound Level 100 90 80 70 60 Background 55 d BA Leq 50 40 Dog barking 30 37 d BA Leq 20 (@ 260 ft. dist.) 10 0 Time Sound Levels Leq = Equivalent Continuous Sound Level 100 90 80 70 60 Background 55 dBA Leq 50 ao Dog barking 30 37 d BA Leq 20 (@ 260 ft. dist.) 10 0 Time dBA 100 90 80 70 60 50 40 30 20 10 0 Sound Levels Leq = Equivalent Continuous Sound Level Il � Time Background 55 dBA Leq Dog barking 37 dBA Leq (@ 260 ft. dist.) Refraction from Wind and waves refracted � towards ground � z � C ground high speed of wind sound V A.T !ow speed of wind Temperature Inversion <D cooler, sound travels sl � Warmor, sound travels taster sound waves sound travels faster 0061er, sound travels slower