4.13 Noise
NOISE
4.13
The principal noise sources attributable to the proposed action would be diesel engines on the dredge, on
construction equipment at the receiver sites, and at the booster pump sites. The noise sources would not
vary from site to site. Noise impacts are evaluated at sensitive receptors at, and near the receiver sites.
Some of the receiver sites are similar to each other in the relationships of the sensitive receptors to the
beach areas. For brevity, similar sites are grouped together. This analysis is also not dependent upon the
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season of project construction because it focuses on permanent receptors (residents) which would be
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present regardless.
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4.13.1 Significance Criteria
Noise impacts would be considered significant if the action would
result in daytime noise levels at any sensitive receptor in excess of the applicable construction noise
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limits, as listed in Table 3.13-2;
carry out noise-generating activities during the hours prohibited by the applicable construction noise
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ordinance, as specified in Table 3.13-2;
result in average hourly nighttime noise levels greater than 45 dBA Leq, or 5 dBA above the ambient
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noise level, whichever is greater, at any residence for more than three consecutive nights;
result in average hourly nighttime noise levels greater than 45 dBA Leq, or 5 dBA above the ambient
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noise level, whichever is greater, at any residence if there has been no notification to the resident; or
result in noise levels to sensitive threatened or endangered species in excess of standards set by the
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resource agency with jurisdiction over the species.
4.13.2 Alternative 1
Noise Sources
The dominant noise generated during dredging and placement of sand will be the noise from diesel engines
used to drive various pieces of equipment. On the dredge, the engines would be used for propulsion, to
power the dredge equipment, and to provide electric power. At the receiver sites, diesel engines would
Regional Beach Sand Project EIR/EA
Page 4.13-1
99-69\sect-04.13.wpd 7/19/00
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