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3.0 Environmental Impact Checklist <br /> Table 3: Redwood City Noise Guidelines for Residential Uses <br /> Land Use Category Normally Conditionally Normally Clearly • <br /> Acceptable Acceptable Unacceptable Unacceptable <br /> Residential: ----- ��� - - <55 dB 55-65 d6 65-75 dB >75 dB Medum/Medium-High Density f ' <br /> Notes: <br /> Normally acceptable:specified land use is satisfactory,assuming buildings are of conventional <br /> construction <br /> Conditionally acceptable:new development should be undertaken only after detailed analysis of noise <br /> reduction requirements is made. <br /> Normally unacceptable: new development should be generally discouraged,if not,a detailed analysis <br /> of noise reduction requirements must be made. <br /> [Clearly unacceptable:new development should generally not be undertaken. <br /> Source:Redwood City General Pfan 2010. <br /> Although temporary and intermittent,noise generated from construction activities can be <br /> intrusive because of its high output and repetitive nature. Construction noise would occur due <br /> to the use of construction equipment, including front loaders,backhoes,haul trucks, and <br /> cement trucks used for excavation,grading, and constructing of the structures.Table 4 lists the <br /> typical noise generated from some construction equipment. Project construction would be <br /> temporary and last approximately 16 months. <br /> Table 4 Conslru_clion Equii m nt Noise <br /> Equipment . Typical Noise.Level at 50 Feet From Source(dBA) <br /> Backhoe 1_ 80 dBA <br /> Concrete Mixer I 85 dBA <br /> Loader I 85 dBA <br /> Trucks i 88 dBA <br /> Source:Federal Transit Administration 2006. <br /> Construction scheduling requirements are established by the City to ensure that such noise is <br /> limited in duration and only occurs during weekday daytime hours. Project construction would <br /> comply with the City of Redwood City's construction noise regulations. Chapter 24, Section <br /> 24.32 of the Redwood City Municipal Code prohibits construction activities,including <br /> demolition, alteration,repair or remodeling of or to existing structures and the construction of <br /> new structures on property in a residential district or within 500 feet of a residential district, <br /> between the hours of 8 PM and 7 AM on weekdays or at any time on weekends and holidays.In <br /> addition, Section 24.31 prohibits noise levels from exceeding 110 dBA at a distance of 25 feet for <br /> any item of machinery, equipment, or device used during construction in a residential district. <br /> Noise from project construction may surpass the normally acceptable exterior noise levels for <br /> residential land uses, as indicated by the noise levels generated by construction equipment <br /> above(see Table 4).However, project construction is not anticipated to exceed the City's <br /> La Palma Subdivision Project <br /> Final Initial Study/Mitigated Negative Declaration <br /> 49 <br />