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May 12, 2005· I know that a M22 makes a whining sound in 1st, 2nd & 3rd gears but how loud? Does a M21 make any noise at all? Mine makes a whine in the 3 gears

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G. NOISE Comment G-1 The longer-term rock crushing operation has some dBA's above recommend dBA's of 55 [at the Midland Avenue southbound exit ramp].

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Size reduction & control - Crushing of ore and minerals. In these operations the value is achieved at the fine end, say below 100 micron (150 mesh).

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G. NOISE Comment G-1 The longer-term rock crushing operation has some dBA's above recommend dBA's of 55 [at the Midland Avenue southbound exit ramp].

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Psychoacoustic Evaluation of Rock Crushing Plant Noise Marko Antila, Heikki Isomoisio, Jari Kataja VTT Technical Research Centre of Finland, Tampere, Finland

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The rock crushing noise isn't just a problem on the city's east side.