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<br /> <br />Elk River Peaking Station <br /> <br />Decibel Levels of Common Noise Sources <br /> <br />Many different properties affect the noise level of a specific source type. For example, three <br />lawn mowers may have three different noise levels because of differences in each specific piece of <br />equipment. Noise level also depends on the distance from the noise source and the attenuation of <br />the surrounding environment. <br /> <br />Here's a rough estimate of decibel levels of some common noise sources: <br /> <br />Decibel Levels of Common Noise Sources <br /> <br />50 <br />40-50 <br />40 <br />30 <br />20 <br /> <br />Noise Source <br />Jet Engine (at 75 feet) <br />Jet Aircraft (at 300 feet) <br />Rock and Roll Concert <br />Pneumatic Chipper <br />Jointer/Planer <br />Chainsaw <br />Heavy Truck Traffic <br />Business Office <br />Conversational Speech <br />Proposed Elk River Peaking Station (at <br />nearest residence) <br />Library <br />Typical Substation <br />Bed room <br />Secluded Woods <br />Whisper <br /> <br />Sound Pressure Level (dBA) <br />140 <br />130 <br />120 <br />110 <br />100 <br />90 <br />80 <br />70 <br />60 <br />50 <br /> <br />From: A Guide to Noise Control in Minnesota, Acoustical Properties, Measurement, Analysis, <br />Regulation, Minnesota Pollution Control Agency, March 1999 and After Noise Pollution, U. s. <br />Environmental Protection Agency, August 1972. <br /> <br />A 1OOclut_ Enersv' Cooper.tiY< IS!? <br /> <br /> <br />17845 East Highway 10 <br />P.O. Box 800 <br />Elk River, MN 55330-0800 <br />Phone: 763-241-2200 <br />www.GreatRiverEnergy.com <br /> <br />GREAT RIVER ENERGY~ <br /> <br />6/14/07 <br />