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Impacts and Mitigation Measures Impact 1 - Construction Noise Construction of the proposed facility would cause a temporary noise increase, which would be evident to one neighbor, located 600 feet to the south. Construction activities are normally carried out in a series of individual stages. Equipment anticipated to be used during the initial construction phase (expected to last one month) includes two compactors, a rubber-tired front-end loader, a backhoe, a portable crane, haul and ready-mix concrete trucks (Dorsey 1988) . Noise levels at 50 feet gener- ated by some of this equipment could reach up to 96 dBA, (se( Table 3.12) . However, these are only approximate sound levels. Individual differences between similar machinery may be quite pronounced depending on the age, condition and noise-reducing equipment installed on each piece of equipment. The noise generated by the machinery would diminish about 6 dB for every doubling of distance from the source due to divergence, atmospheric absorption, and ground absorption/reflection. In spite of this noise attenuation, increased sound levels to the residence to the south should be expected. This increase could be as much as 10 to 15 dB over existing background noise levels. That is, construction-related noise could reach up to 74 dBA for short periods at the residence, depending on the type of construction activity occurring on site. Mitigation Measures. Since only one residence would be noticeably affected by noise impacts, the following specific measures are proposed: • Whenever possible, noisy operations should be replaced with less noisy ones; particularly noisy tasks, like concrete mixing, would be performed off-site; • The quietest among alternative equipment should be selected for use; and 3-68 101-37.R5 4/10/89