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<br />7 <br /> <br />(e) For a project located within an airport land use plan or where such a plan has not been <br />adopted within two miles of a public airport or public use airport, if the project would <br />expose people residing or working in the project area to excessive noise levels; or <br /> <br />(f) For a project within the vicinity of a private airstrip, if the project would expose people <br />residing or working in the project area to excessive noise levels. <br /> <br />CEQA does not define what noise level increase would be considered substantial. Typically, <br />project-generated noise level increases of 3 dBA Ldn/CNEL or greater would be considered <br />significant where exterior noise levels would exceed the normally acceptable noise level standard <br />(60 dBA Ldn/CNEL for residential land uses). Where noise levels would remain at or below the <br />normally acceptable noise level standard with the project, noise level increases of 5 dBA Ldn/CNEL <br />or greater would be considered significant. <br /> <br />City of Redwood City 2010 General Plan. The City of Redwood City’s General Plan identifies <br />noise and land use compatibility standards for various land uses and establishes policies to control <br />noise within the community. Table PS-10 from the General Plan shows acceptable levels for various <br />land uses. Open space/recreation land uses are considered normally acceptable in noise <br />environments of 75 dBA CNEL or less. The guidelines state that where the exterior noise levels are <br />greater than 75 dBA CNEL and less than 80 dBA CNEL, new development should be generally <br />discouraged or a detailed analysis of noise reduction requirements must be made. Noise levels <br />exceeding 80 dBA CNEL are considered unacceptable and should not be undertaken. For low <br />density residential land uses, normally acceptable noise levels would be at or below 55 dBA CNEL. <br />Noise levels ranging from 55 to 60 dBA CNEL would be considered conditionally acceptable for <br />low density residential land uses, while levels between 60 and 75 dBA CNEL would be considered <br />normally unacceptable. Noise levels exceeding 75 dBA CNEL would be considered clearly <br />unacceptable. In accordance with Title 24 of the California Building Code, the City’s 2010 General <br />Plan also stipulates a maximum of 45 dBA CNEL for interior residential noise levels. <br /> <br />8.A. - Page 123