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c I . 111, engineering <br />, ed <br />III. ANALYSIS <br />A. Analysis Method <br />The analysis method is as follows: <br />1. The noise emission level of the specific piece of equipment operating in the pit will be established <br />either from manufacturer's published data, actual noise data obtained by E. D. I. on other projects or <br />estimates derived using noise emission data of similar equipment. These noise emissions data are <br />presented in Table 1, "Mining Equipment Inventory, Usage and Noise Emission Levels ". <br />2. The position or positions of the mining equipment within the pit boundary will be determined. For <br />example, the electric generator will be placed at a fixed location whereas the track hoe and loader <br />will be at many positions within the pit boundary. <br />3. Using the data and information from 1 and 2 above, near the south boundary of the pit, the noise <br />level at the pit boundary will be computed. If the noise level exceeds 55 dB(A), then the amount of <br />noise reduction required will be determined. For example, if we find the noise level to be 65 dB(A) <br />then we know that 10 dB(A) reduction must be made. <br />4. Noise reduction methods will be designed for each piece of equipment that exceeds the 55 dB(A) <br />limit at the north pit boundary. For example, if the electric generator were to exceed 55 dB(A) even <br />at its planned location in the southern area of the pit, it could be set below grade, which would lower <br />the noise level at the pit boundary. <br />Table 1 <br />Mining Equipment Inventory <br />Usage and Noise Emission Levels <br />Description <br />Mfg. /Model <br />Power <br />Noise Level <br />dB(A)@ 100 ft. <br />References <br />Electric Generator <br />Cummins 1710 <br />350 KW <br />67 <br />Track Hoe <br />Proclaim GC 120 <br />FGL514 <br />58 <br />Loader <br />Allis Fiatallis -745 <br />200 hp <br />58 <br />Conveyors(5) <br />- -- <br />Electric <br />45 <br />Stacker <br />- -- <br />15 hp Electric <br />45 <br />Trammel Rotating <br />Screen <br />- -- <br />Electric <br />60 <br />Water Pump <br />- -- <br />8 hp submersible <br />40 <br />Grisley Belt Feed <br />-- <br />20 hp Electric <br />45 <br />Vibratory Screen <br />(4X8ft.) <br />___ <br />15 hp Electric <br />60 <br />Feeder Hopper <br />- -- <br />15 hp Electric <br />45 <br />E.D.I. Job # C3864 <br />Page 8 of 11 <br />3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303- 761 -4367 • fax: 303 - 761 -4379 <br />