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1. All metal parts of the washplant operation that will come in contact with the rock will be lined <br />with rubber material, in order to minimize the noise generated. <br />2. Noise emission during pit operations will not exceed 55 dB(A) when measured at the pit <br />boundary. The only exception would be during initial surface soil scraping and storage of that <br />material which will be used during reclamation. The Applicant expects the duration of these <br />activities to be less than one week. <br />3. Mining will start at the south portion of the pit and move to the north. The initial pit floor will <br />be 25 feet below grade and the mining face will be on a 1 to 1 slope (45 deg). This mine face <br />will be a noise barrier and will reduce the noise from the loader and back hoe to less than 55 <br />dB(A) at the pit boundary. <br />4. The diesel engine driven electric generator will be set on the pit floor. The mine face will be a <br />noise barrier and the noise level at the pit boundary will be less than 55 dB(A). The existing <br />electric generator may be replaced with one of lower power, which would be quieter than the <br />350 KW unit currently used by the Applicant. <br />5. The electric generator, loader and back hoe will be fitted with high performance mufflers. At <br />the present time, some of this equipment is unmuffled. <br />6. All backup alarms will be of the white noise type and will be adjusted during installation to <br />meet all regulatory requirements. <br />7. Customer haul trucks that exceed the noise limits specified in CRS 25 -1 2 -107 may be denied <br />access to the pit until they have been maintained and are in compliance. <br />8. Noise measurements may be taken once the pit expansion area of the pit is in production to <br />verify compliance with the 55 dB(A) noise limit at the pit boundary. Measurement results will <br />be detailed in a report certified by a Professional Acoustical Engineer registered in the State of <br />Colorado. <br />All mitigation should reduce levels to an acceptable level of no greater than 55 decibels, as measured <br />at the BLM property boundary that is nearest a residential receptor. <br />No Action Alternative <br />Direct and Indirect Impacts: There will be no change from current conditions for this area of <br />Park County, Colorado. <br />Cumulative Impacts: There will be no change from current conditions for this area of Park <br />County, Colorado. <br />Mitigation/Residual Effects: N/A <br />Alternative 1 <br />Direct and Indirect Impacts: Alternative 1 and associated impacts would be similar to the <br />Proposed Action Alternative. <br />Cumulative Impacts: Alternative 1 and associated cumulative impacts would be similar to the <br />Proposed Action Alternative. <br />Mitigation/Residual Effects: Alternative 1 and associated residual impacts would be similar to <br />the Proposed Action Alternative. <br />45 <br />