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7.1.A. - Page 39 <br /> Carlos Airport, other major transportation arterials and collector streets). Construction noise is required <br /> to be less than 110 decibels (dB) within residential districts of the City, and construction activities in a <br /> residential district are generally restricted to the week day hours of 7:00 A.M. to 8:00 P.M. The General <br /> Plan Noise Element requires all exterior noise sources (construction operations, air compressors, pumps, <br /> fans, and leaf blowers) to use available noise suppression devices and techniques to bring exterior noise <br /> down to acceptable levels compatible with adjacent land uses. Land uses that are considered to be <br /> noise-sensitive include residential uses (including mobile home parks), parks, and public buildings such <br /> as schools and libraries. <br /> Construction Noise —The primary noise impact from the project is construction-related noise. <br /> This is considered a short-term impact, and is largely a function of the noise generated by <br /> construction equipment, the location and sensitivity of nearby land uses, and the timing and <br /> duration of the noise-generating activities. Construction noise levels would vary depending on <br /> construction phase, equipment type and duration of use, distance between noise source and <br /> receptor, and presence or absence of barriers between noise source and receptor. <br /> There are a number of sensitive receptors along the various pipeline routes of the recycled <br /> water project. They include residential, park, schools, and other public uses. Many of these uses <br /> will also be customers of the recycled water, so performing construction activities adjacent to <br /> them is a necessity of the project. Implementation of the following construction period noise <br /> control measures would reduce this temporary impact to a less than significant level: <br /> • Normally scheduled construction activities should adhere to the City's Noise Ordinance <br /> • All construction equipment operated at the project site should be equipped with <br /> manufacturer's standard noise control devices (i.e., mufflers, engine enclosures, etc.) <br /> • Vibration/sonic-type pile drivers, rather than impact-type drivers, should be used with <br /> acoustically-treated engine enclosures and mufflers, wherever feasible. <br /> • All construction equipment should be inspected by the contractor at periodic intervals <br /> to ensure proper maintenance and hence, lower noise levels. <br /> • Wherever feasible, pipeline construction activities adjacent to any schools will be <br /> coordinated so that all construction, or at least the noisier phases of construction occur <br /> when schools are not in session (e.g., during school vacations). At a minimum, project <br /> scheduling should be coordinated with schools that have any classrooms within 50 feet <br /> of proposed construction activities. Alternatively, it may be possible for schools to <br /> temporarily relocate classes held in affected buildings to other buildings on campus. <br /> • Pipeline construction activities adjacent to public uses other than schools (libraries or <br /> community centers) should be coordinated with schedules of affected uses. <br /> Assuming that trench-and-cover construction would progress at an average rate of 300 feet per <br /> day, maximum noise levels directly in front of any individual residential or school receptor <br /> would occur for approximately one or two days. However, construction activities typically could <br /> occur in the vicinity of any one location along the construction route for one to two weeks. <br /> Therefore, although construction-related noise increases at sensitive receptors is considered <br /> 25 <br />