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8.A. - Page 53 Summary of Impacts Potentially Less than Signifcant Less than Significant With Mitigation Signifcant No Im act Incor orated Im act Im act XIL NOISE— YVould the project: a) Expose persons to or generate noise levels in excess of standards established in X the local general plan or noise ordinance, or applicable standards of other agencies? b) Expose persons to or generate excessive ground-bome vibration or ground- X borne noise levels? c) Result in a substantial permanent increase in ambient noise levels in the X project vicinity above levels existing without the project? d) Result in a substantial temporary or periodic increase in ambient noise levels X in the project vicinity above levels existing without the project? e) For a project located within an airport land use plan or, where such a plan has X not been adopted,within two miles of a public auport or public use airport, e�pose people residing or working in the project area to excessive noise levels? � For a project within the vicinity of a private airstrip, expose people residing or X working in the project area to excessive noise levels? Documentation: a., b., &d Noise in Redwood City is regulated by the City's Noise Orc&nance (Chapter 24 of the Municipal Code). In adc&fion, the Noise Element of the City's General Plan enumerates noise policies. More specifically, excessive and unreasonable noise levels are defined as noise levels generated by construction activifies, incluc&ng demolifior� alteration, repair or remodeling of existing structures, and construction of new structures, on properiy within the City, at more than 110 decibels(dB)measured at any point within a residential c&strict of the City and outride of the plane of the property. Therefore, construcfion noise is reguired to be less than 110 dB within residential c&stncts or within 500 feet of a residenfial c&stnct in the City, and no construction noise is permitZed between the hours of 8:00 P.M. and 7:00 A.M. the following day. The General Plan reguires all extenor noise sources (construction operafions, air compressors, pumps,f�s, and leaf blowers) to use available noise suppression devices and technigues to bnng extenor noise down to acceptable levels compatible with adfacentland uses. The pnmary sources of noise from the project will be temporary construction noise and operational noise. Construcfion noise is largely a funcfion of the construction eguipment usec� the locafion and sensifivity of nearby land uses, and the timing and duration of the noise-generating acfivities Construction noise levels would vary depenc&ng on construcfion phase, eguipment type and durafion ofuse, c&stance between noise source and receptor, and presence or absence ofbarriers between noise source and receptor. All noise-generating construction activities are anticipated to be conducted on weekdays between the hours of 7:00 A.M. and 8:00 P.M. in accordance with City reguirements. The DTPP program EIR (pp. 11-20) concluded that new DTPP facilitated multifamily residential development could be exposed to noise levels exceec&ng City guidelines and State Title 24 standards, resulfing in a potenfially significant impact Mifigation 11-1 states that a noise study consistent with the reguirements of the California Build(ng Code shall be conductedfor new multifamily residenfialprojects, and noise reduction measures necessary to achieve compafibility with the City's Noise Elementguidelines (55 dBA CNEL at sensitive extenor spaces) and Title 24 standards (45 dBA CNEL within residential units) shall be incorporated into the project This measure, which shall be reguired as a conc&tion of approval for the projec� will reduce the potenfial noise impacts on the project to a less-than-signific�t level. The DTPP program EIR (p. 11-22) also idenfified potentially significant intermittent vibration impacts for residenfial projects located within 100 feet of the centerline of the Caltrain railroad tracks. The proposed project site is located more than 1,400 feetfrom the centerline of the railroad and therefore would not be impacted 18