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8.B. - Page 70 <br /> NOISE <br /> Less Than <br /> Potentially Significant Less Than <br /> Significant With Significant No Impact Beneficial Information <br /> Impact Mitigation Impact Impact Source(s) <br /> Incorporated <br /> Would the project: <br /> 2) Exposure of persons to, or generation � � � � � 1,2 <br /> of, excessive groundborne vibration <br /> or groundborne noise levels? <br /> 3) A substantial permanent increase in <br /> ambient noise levels in the project � � � � � 1,2 <br /> vicinity above levels existing without <br /> the project? <br /> 4) A substantial temporary or periodic � � � � � 1,2 <br /> increase in ambient noise levels in the <br /> project vicinity above levels existing <br /> without the project? <br /> 5) For a project located within an � � � � � 1,2 <br /> airport land use plan or,where such <br /> a plan has not been adopted,within <br /> two miles of a public airport or <br /> public use airport,would the project <br /> expose people residing or working <br /> in the project area to excessive <br /> noise levels? <br /> 6) For a project within the vicinity of a � � � � � 1,2 <br /> private airstrip,would the proj ect <br /> expose people residing or working in <br /> the project area to excessive noise <br /> levels? <br /> 4.12.2.1 Noise Impacts to the Project <br /> As stated above,residential land uses are acceptable in areas with ambient noise levels of 55 dBA or <br /> less. Based on the Redwood City Noise Contour Maps (Figures PS-11 and PS-12 in the General <br /> Plan), Lots 3, 4, and 5 are located in the 55 dBA and lower noise contour,therefore, Lots 3, 4, and 5 <br /> would be consistent with City standards. <br /> Lots 1 and 2 of the proposed project would be located within the 55 dBA and higher noise contours <br /> because of their pro�mity to Valota Road which generates noise levels of up to 70 dBA. The State <br /> of California Building Code Title 24 standards and the City of Redwood City require that interior <br /> noise levels within new residential units not exceed 45 dBA Ld,,. To achieve interior noise standards, <br /> the Redwood City General Plan requires the completion of acoustical analyses, as appropriate, for <br /> proposed stand-alone residential development located in areas with exterior noise levels that are 55 <br /> dBA and higher. <br /> Lot 2 would be somewhat shielded from traffic noise by the residential building on Lot 1 but could <br /> still be exposed to noise levels of 55 to 60 dBA which is up to five decibels louder than the City's <br /> acceptable noise level for medium density residential development. Lot 1 would be exposed to noise <br /> levels of up to 70 dBA. Because Lots 1 and 2 of the proposed project could be exposed to exterior <br /> noise levels that are in excess of the City's normally acceptable noise levels for residential medium- <br /> 1410 Valota Road Residential Project 58 Initial Study <br /> Redwood City January 2012 <br />