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<br />davld bO~ b <br /> <br />~8BoclatesJ incorporated <br /> <br />1313 5th street s.e. . suite 322 · minneapolis. mn 55414 <br />telephone: 612-331-4571 · fax: 612-331-4572 <br /> <br />IvfEMORANDUM <br /> <br />TO: <br /> <br />Rick Riehm <br />1348 Keats Avenue NW <br />AnnandaIe, MN 55302 <br /> <br />FROM: <br /> <br />David Braslau <br /> <br />RE: <br /> <br />Trail Bike Area - Noise Assesment <br /> <br />?9 July 2005 <br /> <br />This memorandum reports on the noise assessment that was completed for your proposed trail <br />bike area in the area between IOrb and 20th S1. NW fu1.d County 6 and Keats Avenue SW in ' <br />Annandale, Minnesota., ' , ' <br /> <br />Sound Level Monitoring Program <br /> <br />Sound levels were monitored at nine points (see Attachmerit 1) surrounding the existing trail <br />bike area when three trail bikes were continuously traveling around the track. The tlm~e bikes <br />represented a typical range of bikes that can be expected to use the area:. <br />. 4-stroke 2005 Honda CRF 450 <br />. 2-stroke 2004 Yamaha YZ85 <br />. 2-stroke 2004 KTM SX65 <br /> <br />Results of this monitoring are presented in the table below. LIO represents the level that is <br />exceeded for 10% of the monitoring period, generally 3 minutes. Assuming that activity on the <br />trail were continuous over an hour, the L] 0 levels in the table below represent the hourly LID <br />levels that are limited under the Milmeso1.a State Noise Standards to 65 dBA from 7 am to ] 0 pm <br />at residential land uses. It can be se.en that ohly Site 5, which was approximately 100 feet from <br />the closest passby of a trail bike, was above this level. <br /> <br />Site LID (dBA) <br />1 55.5 <br />2 62.8 <br />3 63.9 <br />4 57.2 <br />5 68.~ <br />6 56.6 <br />7 55.8 <br />8 49.7 <br />9 57.9 <br /> <br />y: \j obs\2005j obs\2 05064 \riehm-0729-mem. doc <br /> <br />17 <br />