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3.2.3 Wear Induced Noise <br />• A-weighted and octave band noise levels were monitored at selected <br />sites near the major equipment complexes. Specific sites examined during <br />r- <br />this study were: <br />u <br /> Area Site Numbers Reference Map <br />r <br />I i <br />~ Ax <br />al Vane Fan F-1, 2, 3 1 <br />~* <br />~' Transfer Tower TT-1, 2 1 <br /> Crusher & Screening Area C-1, 4, 6, 8, 10 4. <br />''i <br />Truck Dump <br />TD-1, 2, 3 <br />2 <br /> Silos S-1, 2, 3 2 <br />rt <br />~~ <br />!;, Pump House P-1 <br />-- <br /> Normal operations were in effect during each of these measurements, <br />` and Westmoreland personnel indicated that the mine was operating near full <br />• capacity. <br />L; 4.0 RESULTS <br />Field data sheets and graphs are presented in Appendix A. Comparison <br />with previous data shows changes in several areas. Specific complexes are <br />discussed in the following paragraphs. <br />4.1 Significant Operations Changes & Wear Induced Noise Fluctuations <br />a) Axial Vane Fan - Sites F-1, 2, 3 <br />In general there were no significant audible changes in the <br />)''- sound levels at any of the axial vane fan sites. Data from site <br />~: <br />F-I show that A-weighted sound levels decreased by 2 dB with a <br />r <br />drop of over 6 d6 at 250 Hz peak. A-weighted sound levels at site <br />,• F-2 remained the same although at 250 Hz a 5 dB decrease was <br /> <br />~, <br />L' <br />