1. Construction Noise

SCE has identified its intended use, during project construction, of an air compressor, which is considered a stationary piece of construction equipment. Maximum stationary construction noise levels are defined by the County of Los Angeles as 60 dBA at single-family residences, 65 decibels (dBA) at multi-family residences, and 70 dBA at commercial uses. An air compressor can be expected to generate a noise level of approximately 81 dBA at 50 feet. Therefore, stationary construction equipment operations within 600 feet of single-family residences, 350 feet of multi-family residences, and approximately 200 feet of commercial uses may, depending on the equipment in use, generate noise levels in excess of the maximum levels defined by the County.

Accordingly, construction noise nuisances within these distances would result in a significant impact. Implementing Mitigation Measures N-1a, N-1b, and N-1c (see, pages A-23 to A-24 of Attachment A) would reduce the short-term noise impact associated with construction noise levels in violation of local standards to a level that is less than significant, except for mobile equipment, which would continue to violate local standards and therefore result in a significant unavoidable impact (Class I).