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nro?o?+oree <br />edriii <br />6. Shovel <br />The Hitachi 5500 shovel has the largest acoustic output of all of the equipment operating at the CC&V <br />Mine. Most of the noise comes from the engine compartment, which is about 18 ft above ground <br />level. The Hitachi 5500 shovel produces 55 dB(A) at a distance of 1995 ft. and 50 dB(A) at a <br />distance of 3500 ft. when there is a direct line-of-sight between the shovel and the receptor. At Site <br />C', the shovel can operate during both the daytime and nighttime without any noise mitigation. During <br />the daytime the shovel can operated at Sites B', C', D' and H' without any noise mitigation. When <br />there is a berm of about 30 ft. in height or a bench face, the daytime and nighttime 55 dB(A) and 50 <br />dB(A) are such that the shovel is in compliance at all sites. When the second and subsequent bench <br />levels are being mined the shovel will be several benches below the mine face and the noise <br />reduction will be such that the 55 dB(A) and 50 dB(A) distances will be within the confines of the <br />mining activity area. <br />7. Work Lights <br />During mining, work lights may be used. The engine/generator units powering the work lights <br />produces 71 dB(A) at 100 ft. The 50 dB(A) noise contour or foot print for the work light generator <br />would extend for a distance of 1100 ft. A small movable noise wall would reduce the engine noise by <br />more than 5 dB(A) and reduce the 50 dB(A) distance to 630 ft. for those situation where the generator <br />was not shielded by the berm and only for receptor Sites A' and F. <br />Rev # EDI Job No. C3616 <br />Page 16 of 17 <br />3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379