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V. CONCLUSIONS AND RECOMMENDATIONS <br />e <br />t engineering <br />dynamics <br />incorporated <br />1. Noise emission during pit operations will not exceed 55 dB(A) when measured at the pit boundary. The <br />only exception would be during initial surface soil scraping and storage of that material which will be <br />used during reclamation. The Applicant expects the duration of these activities to be Tess than one <br />week. <br />2. Mining will start at the south portion of the pit and move to the north. The initial pit floor will be 25 ft. <br />below grade and the mining face will be on a 1 to 1 slope (45 deg). This mine face will be a noise barrier <br />and will reduce the noise from the loader and back hoe to less than 55 dB(A) at the pit boundary. <br />3. The diesel engine driven electric generator will be set on the pit floor. The mine face will be a noise <br />barrier and the noise level at the pit boundary will be Tess than 55 dB(A). The existing electric generator <br />may be replaced with one of lower power, which would be quieter than the 350 KW unit currently used by <br />the Applicant. <br />4. The electric generator, loader and back hoe will be fitted with high performance mufflers. At the present <br />time, some of these equipment are unmuffled. One manufacture of high performance mufflers, the <br />Donaldson Co., can provide the required mufflers. <br />5. All backup alarms will be of the white noise type and will be adjusted during installation to meet all <br />regulatory requirements. <br />6. Customer haul trucks that exceed the noise limits specified in CRS 25 -12 -107 may be denied access to <br />the pit until they have been maintained and are in compliance. <br />7. Noise measurements may be taken once the pit expansion area of the pit is in production to verify <br />compliance with the 55 dB(A) noise limit at the pit bondary. Measurement results will be detailed in a <br />report certified by a Professional Acoustical Engineer registered in the State of Colorado. <br />E.D.I. Job # C3854 <br />Page 11 of 11 <br />3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303 -761 -4367 • fax: 303 - 761 -4379 <br />