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<br /> Table N-l <br />City Of Santa Ana Land Use Guidelines For Exterior Noise <br />Land Use Noise Level (dBA CNEL or Ldn) <br /> Desirable Maximum Acceptable <br /> Maximum <br />Low Density 55 65 <br />Residential <br />Medium Density 60 65 <br />Residential <br />High Density 65 70 <br />Residential <br />Schools 60 70 <br />Commercial, Office 65 75 <br />Industrial 70 75 <br />Noise Ordinance <br />The City also regulates noise though Chapter 18, Article VI <br />of the Municipal Code Noise Ordinance. The Noise Ordinance <br />presents permissible noise intrusion levels and sets <br />exterior and interior noise standards for different times <br />of the day and night. Additionally, the Noise Ordinance <br />recognizes that some forms of noise are required for urban <br />development. Section 18-314 (e) of the Municipal Code Noise <br />Ordinance exempts noise sources associated with <br />construction, repair, remodeling, or grading of any real <br />property, provided said activities take place between the <br />hours of 7:00 a.m. and 8:00 p.m. Monday through Saturday, <br />and no construction activity any time on Sundays or federal <br />holidays. <br />Threshold of Significance <br />A project is considered to result in significant noise <br />impacts when it exposes persons to noise levels that exceed <br />the noise levels in Table N-1 or when a permanent increase <br />in ambient noise levels of 3db or greater occurs when the <br />existing CNEL is 65dB or greater. Additionally, a <br />significant impact could occur when the stationary noise <br />source of a project is in conflict with the City's Noise <br />Ordinance. <br />Less Than Significant Impact <br />22 758-37 <br />