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2 Environments 7.B. - Page 93 <br /> e) For a project located within an airport ❑ ❑ ❑ <br /> land use plan or,where such a plan has <br /> not been adopted,within two miles of a <br /> public airport or public use airport,would <br /> the project expose people residing or <br /> working in the project area to excessive <br /> noise levels? <br /> f) For a project within the vicinity of a ❑ ❑ ❑ <br /> private airstrip,would the project expose <br /> people residing or working in the project <br /> area to excessive noise levels? <br /> a)Exposure of persons to or generation of noise levels in excess of standards established in <br /> the local general plan or noise ordinance, or applicable standards of other agencies? <br /> Construction of the proposed project and demolition of the existing pump station would result in <br /> maximum noise levels that would typically range from 75 to 81 dBA at a distance of 50 feet (see <br /> Appendix J). This range of noise levels would be less than the average levels from weekday traffic on <br /> US 101 at this distance. While noise from construction may occasionally be audible at the adjacent <br /> properties because of variations in construction activity and traffic conditions,most noise from the <br /> installation of the replacement pump and the joint-use path would be below background levels. <br /> The highest noise levels from construction of the proposed project would come from the pile driver <br /> used for up to 10 days during the installation of the replacement pump station on the north side of <br /> US 101. The noise levels from pile driving would be 94 dBA Leq at 50 feet. On the north side of <br /> US 101, the nearest uses are regional commercial, One Marina development,a mixed-use residential <br /> development currently under construction, and the houseboats along Redwood Creek. The One <br /> Marina Village residential units need to incorporate measures to reduce interior noise levels to meet <br /> city and state standards. These features would lessen the impact of noise from pile driving to less <br /> than 62 dBA Leq in the interior of any occupied units. The houseboats along Redwood Creek are 800 <br /> to 1,300 feet from the pump station site but 150 to 640 feet from US 101. At those distances, the <br /> noise levels from pile driving would be within the range of noise measurements from traffic on US <br /> 101. <br /> Public exposure to noise from construction would exceed the levels that the general plan considers <br /> normally acceptable at adjacent commercial and mixed-use properties north and south of US 101. <br /> This activity would require the recommended construction mitigation measure,limiting construction <br /> to daytime hours on weekdays and using routine noise suppression techniques (see mitigation <br /> measures NOI 1,NOI 2,NOI 3,NOI 4, and NOI 5). <br /> 2-53 US 101 Pedestrian Undercrossing and Bair <br /> Island Road Storm Drain Pump Station Project <br />