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..s: '• • <br />is normally used for occupational noise exposure and does not separate <br />the frequency noise levels. Certain Frequencies may be more of a nuisance <br />at lower decibel levels, therefore, these readings may not indicate the <br />actual nuisance level charge. Weather conditions may also have some affect <br />as shown by varying noise readings since the noise wall installation. <br />A short breakdown of costs are: <br />Noise damping compound $ 600 <br />Special noise deadening diffuser 3,600 <br />Noise wall 7,000 <br />A long term cast that has not been calculated is the power cost from <br />increased resistance on the fan. A 7Y, increase in water gauge was noted <br />from installation of the wall. <br />If there are any questions please feel free to contact me. <br />Yours truly, <br />Larry M. Reschke <br />Mine Engineer <br />LMR:mc <br />encl. <br />