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SANTA ANA REZONE PROJECT <br />INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br />General Plan <br />The City has established the following goals and implementation measures that are applicable to the <br />proposed project and that are designed to prevent significant increases in noise levels in the <br />community and to minimize the adverse effects of currently -existing noise sources: <br />Goal N-2 Noise Generators —Reduce the impact of known sources of noise and vibration. <br />Implementation Action 2.1—Alternative Paving: Evaluate the use of alternative paving materials <br />that can reduce traffic noise, as feasible, depending on roadway conditions and cost -efficiency. <br />Code of Ordinances <br />The Municipal Code contains Noise Control Ordinances in Article VI of Chapter 18, Health and <br />Sanitation. Sections of the Municipal Code that are applicable to the proposed project are <br />summarized below. <br />Municipal Code Section 18-312 establishes exterior noise standards, limiting noise levels at receiving <br />residential homes to 55 dBA during the daytime hours between 7:00 a.m. and 10:00 p.m. and 50 dBA <br />during the nighttime hours between 10:00 p.m. and 7:00 a.m. Noise generation at any location within <br />the City, when measured on any other residential property, must not exceed the following: <br />1. The above noise standard for a cumulative period of more than 30 minutes in any hour; or <br />2. The noise standard plus 5 dBA for a cumulative period of more than 15 minutes in any hour; or <br />3. The noise standard plus 10 dBA for a cumulative period of more than 5 minutes in any hour; or <br />4. The noise standard plus 15 dBA for a cumulative period of more than 1 minute in any hour; or <br />5. The noise standard plus 20 dBA for any period of time. <br />If the ambient noise level exceeds any of the first four noise limit categories above, the cumulative <br />period applicable to that category shall be increased to reflect the ambient noise level. If the ambient <br />noise level exceeds the fifth noise limit category, the maximum allowable noise level under that <br />category shall be increased to reflect the maximum ambient noise level. <br />Section 18-313 establishes interior noise standards, limiting noise levels at receiving residential <br />homes to 55 dBA during the daytime hours between 7:00 a.m. and 10:00 p.m., and 45 dBA during the <br />nighttime hours between 10:00 p.m. and 7:00 a.m. Noise generation at any location within the City of <br />Santa Ana, when measured within any other dwelling unit on any residential property, must not <br />exceed the following: <br />1. The interior noise standard for a cumulative period of more than 5 minutes in any hour; or <br />2. The interior noise standard plus 5 dBA for a cumulative period of more than 1 minute in any <br />hour; or <br />3. The interior noise standard plus 10 dBA for any period of time. <br />If the ambient noise level exceeds any of the first two noise limit categories above, the cumulative <br />period applicable to that category shall be increased to reflect the ambient noise level. If the ambient <br />78 FCS <br />Https://adecinnovaticns.sharepoint.com/sites/PubiicationsSite/Shared Documents/Publications/Client(PN-JN)/0327/03270047/ISMND/03270047 Santa Ana Rezone Project ISMND.docx <br />