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to be a useful means of accounting for the greater annoyance of noise during <br />evening and nighttime hours so that people may be protected from sleep dis- <br />turbance.. Specifically, CN EL is a measure of the cumulative noise exposure <br />in the community and is calculated from the summation of hourly equivalent <br />noise levels (leq) over a 24-hour period with weighting factors of three and Aen <br />applied to evening and nighttime noises respectively. Generally, external <br />CNEL's of 60 dBA or less are considered suitable for residential use and do <br />not require special acoustical considerations in building designs. Since <br />landfill related traffic would occur only during daytime hours it would have <br />minimal effect on the 24-hour CNEL. It is not anticipated that the project <br />would cause the CNEL to exceed 60 dBA and, therefore, project related traffic <br />noise increases are not considered significant. <br />If the site were used for a landfill operation, there would also be <br />intermittent increases of noise level due to the operation of heavy equipment <br />such as dozers, front loaders and compactors. Typically, this type of equip- <br />ment raises noise levels to 70 to 90 dBA at a distance of 50 feet. This would <br />diminish (attenuate) to 64 to 84 dBA at 100 feet, 58 to 78 dBA at 200 feet, <br />52 to 72 dBA at 400 feet, and 46 to 66 dBA at 800 feet. While this is quite <br />high when close to the operating equipment, it is not considered significant <br />due to the remoteness of the site, the distance to the nearest existing and <br />anticipated future residents, and the fact that equipment operation would <br />occur only during daytime working hours. <br />