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• <br />david brea~lr~u e~s~aaiatass, ixicoraor~atad <br />131.3 5th street s.e. • suite 32? • minneapotis, mn 5414 <br />telephone: 612-33'1-4571 • fax:612-331-4572 <br />29 July 2005 <br />• <br />• <br />MEMORANDUM <br />TO: Rick Riehm <br />1348 Keats Avenue I~JW <br />Annandale, MN 55302 <br />FROM: David Braslau <br />RE: Trail Bike Area-Noise Assesment <br />.This memorandum reports on the noise assessment that was completed for your proposed trail <br />bike area in the area between 10`i' and 20`'' St. NW and County 6 and Keats Avenue SW in <br />Annandale, Minnesota. <br />Sound Level Monitoring Program <br />Sound levels were monitored at nine points (see Attachment 1) surrounding the existing trai] <br />bike area when three trail bikes were continuously traveling around the track. The three 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 />Results of this monitoring are presented in the table below. L10 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] O levels in the table below represent the hourly L1.0 <br />levels that a;e lin;it,.d t.u;tier the I1~Iinnesota State 1`Ioise Standards to 65 dBA from 7 a~n to 10 prn <br />at residential land uses. It can be seen that only Site 5, which was approximately 100 feet from <br />the closest passby of a trail bike, was above this level. <br />Site LIO dBA <br />I 55.5 <br />2 62.8 <br />3 63.9 <br />4 57.2 <br />5 68.3 <br />6 56.6 <br />7 55.8 <br />8 49.7 <br />9 57.9 <br />y:\i obs\2005 jobs\20.i0641riehm-0729-mem. doe <br />