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<br />2. Overview a/Noise & Vibration <br /> <br />minutes and shows that noise level that is exceeded 50% of the time. Another example is the 60 dBA <br />exterior noise standard which is allowed to occur for 15 minutes of a 60 minute hour or 25% of the time <br />(15 minutes divided by 60 minutes), Table 2-3 below shows exterior noise standards municipal code <br />section 18-312 and their corresponding Ln. <br /> <br />Table 2-3 <br />Noise Standard and Correspond Ln <br />(dBA) <br /> <br />City Maximum Exterior Noise Standard 75 70 65 60 55 <br />Time Allowed to Occur Maximum 2 minutes 5 minutes 15 minutes 30 minutes <br />Corresponding Ln Maximum L(2) L(8) L(25) L(50) <br /> <br />2.2 REGULATORY SETTING FOR NOISE <br /> <br />2.2.1 City of Santa Ana Noise Regulation <br /> <br />The City of Santa Ana Noise Regulation is provided in Article 6 of the municipal code. The standards <br />imposed by the City aimed at noise control include the following: <br /> <br />Sec. 18-312. Exterior noise standards. <br />(a) The following noise standards, unless otherwise specifically indicated, shall apply to all <br />residential property within a designated noise zone: <br /> <br />Noise Zone <br />1 <br /> <br />EXTERIOR NOISE STANDARDS <br />Noise Level <br />55 dB(A) <br />50 dB(A) <br /> <br />Time Period <br />7:00 a.m. -10:00 p.m. <br />10:00 p.m. - 7:00 a.m. <br /> <br />~ <br /> <br />In the event the alleged offensive noise consists entirely of impact noise, simple tone noise, <br />speech, music, or any combination thereof, each of the above noise levels shall be reduced <br />by five (5) dB (A). <br /> <br />(b) It shall be unlawful for any person at any location within the City of Santa Ana to create any <br />noise, or to allow the creation of any noise on property owned, leased, occupied, or <br />otherwise controlled by such person, when the foregoing causes the noise level, when <br />measured on any other residential property, to exceed: <br />(1) The noise standard for a cumulative period of more than thirty (30) minutes in any hour; <br />or <br />(2) The noise standard plus five (5) dB(A) for a cumulative period of more than fifteen (15) <br />minutes in any hour; or <br />(3) The noise standard plus ten (10) dB(A) for a cumulative period of more than five (5) <br />minutes in any hour; or <br />(4) The noise standard plus fifteen (15) dB(A) for a cumulative period of more than one <br />minute in any hour; or <br />(5) The noise standard plus twenty (20) dB(A) for any period of time. <br /> <br />(c) In the event the ambient noise level exceeds any of the first four (4) noise limit categories <br />above, the cumulative period applicable to said category shall be increased to reflect said <br />ambient noise level. In the event the ambient noise level exceeds the fifth noise limit <br /> <br />Technical NoiJe Study for Mobil Oil Station/Car WaJh Expamion <br />The Planning Center <br /> <br />March 2005 · Page 9 <br /> <br />Q:\SII/IA1-O 1.01:"\Shrfmfw/J _NI!l.\eRtprll'f-FlN/r Ldl!( <br /> <br />31A8~5 <br />