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7.B. - Page 86 Redwood City Chapter 4.Environmental Impact Analysis Regulatory Setting Redwood City General Plan The noise element of the Redwood City General Plan establishes land use compatibility noise guidelines for residential land uses.The residential areas adjacent to the project site are designated as mixed use6 districts,for which the normally acceptable exterior noise level is 60 dBA CNEL and conditionally acceptable exterior noise level is 75 dBA CNEL.As noted above under Ambient Noise Environment,the existing noise levels in the project area range between 61 and 71 CNEL,which is in the conditionally acceptable zone according to the established land use compatibility noise guidelines. Redwood City Noise Ordinance Chapter 24(Noise Regulation) of the Redwood City Municipal Code(the noise ordinance) sets allowable noise limits for residential properties within the City.Section 24.21 prohibits noise increases of 6 dBA above local ambient noise measured at any point within a residential district during the hours of 8 p.m.and 8 a.m.The local ambient noise is defined as the lowest sound level repeating itself during a 6 minute period. For construction activities,Section 24.31 of the Noise Ordinance prohibits noise levels from exceeding 110 dBA during construction within a residential district.The noise level is defined as the maximum continuous sound level or repetitive peak sound level produced by a source or group of sources.Section 24.32 of the Noise Ordinance establishes that nighttime construction activities are prohibited between the hours of 8 p.m.and 7 a.m.on weekdays,or at any time on Saturdays, Sundays,and holidays. Noise Impact Criteria In accordance with CEQA, Redwood City plans and policies,and professional standards,a project noise impact would be considered significant if the project would: • Generate construction noise in excess of 110 dBA during the hours of 7 a.m.and 8 p.m.at noise- sensitive land uses. • Result in an increase in operation noise greater than 6 dBA over the existing background sound level during the hours of 8 p.m.and 8 a.m.at noise-sensitive land uses. • Generate traffic noise in excess of 60 dBA CNEL at noise-sensitive land uses that result in an increase in operation traffic noise of greater than 3 dBA over the noise levels without the project at noise-sensitive land uses.The 3 dBA is generally considered to be the threshold of a perceptible change. 6 The residential uses on the north side of Middlefield Road are designated Mixed Use—Neighborhood and Residential—High.The south sides of the blocks,closest to the project site,are designated Mixed Use— Neighborhood,and the north sides of the blocks,farther from the project site,are designated Residential—High. Addendum No.2 to the Environmental Impact Report for 4-41 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12