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EXECUTIVE SUMMARY <br />At e- - <br />drwmft <br />e (11 <br />Baseline noise measurements were taken around the mine to determine the existing noise environment in the <br />vicinity of Goldfield, Cripple Creek and the Molly Kathleen Mine. Total measurement time at these three sites was <br />3718 hours with the average decibel level recorded for each hour. The measurements showed the average <br />baseline daytime decibel level to be 45 dB(A) to 55 dB(A) and the average nighttime decibel level to be 35 dB(A) <br />to 40 dB(A). Higher noise levels occurred at the measurement site located in Cripple Creek caused by motor <br />vehicles and weather. <br />Eight noise sensitive receptor locations were selected for analysis. These are occupied or public-accessible sites <br />near populations that are closest to the proposed Mine Life Extension (MLE) project activities. A topographical <br />adjusted cross-section between each noise receptor and the proposed mining activities as part of the MLE project <br />was developed. The maximum measured noise emission (as presented in Table 3) for the mining equipment <br />(truck/shovel combination) that will be used during the MLE project was established at 82.6 dB(A) and used to <br />determine the extent of the 55 dB(A) and 50 dB(A) noise contours for each cross-section. Each of the receptor <br />sites was analyzed using the effects of distance, existing topography and the reduction achieved by a noise berm <br />approximately 30 ft. in height applied where proposed in the MLE plan. <br />The noise assessment analysis in conjunction with committed mitigation methods shows that noise during the <br />MLE can be in compliance with the State of Colorado Noise Law, CRS 25-12. <br />Rev # <br />EDI Job No. C3616 <br />Page 2 of 17 <br />3925 S. Kalamath St., Englewood, Colorado 80110 9 voice: 303-761-4367 • fax: 303-761-4379