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;~. <br />;', <br />2.05.3(3)(b)(v) <br />The purpose of this sound block wall is to dampen and redirect the <br />fan noise. Figure 2.05.3(3)(b)(vi)(A)-1 is a letter from the Grand <br />Mesa Coal Company to the neighbors of the Red Canyon #1 Mine in <br />reference to minimizing the fan noise. This shaft is used as the <br />main return air course for the mine. Air readings indicate 90,000 <br />cubic feet per minute o£ air returned through the shaft. Plans for <br />the removal of the <br />• <br /> <br />REVISED May R, 1981 <br />90a <br />